JP4062060B2 - Hermetic compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetic electric compressor, and more particularly to a structure of a motor electric terminal portion that is connected to a motor and supplies electricity to the motor in the hermetic electric compressor.
[0002]
[Prior art]
The hermetic electric compressor is used in various applications, but is also generally used for refrigerant gas compression such as an air conditioner. Conventionally, in a hermetic type electric compressor, a compression mechanism and a motor for driving the compression mechanism are built in a container formed by hermetic welding, and the power source of this motor is externally connected via a motor electrical terminal portion. The motor electric terminal portion is supplied from a power source and has a main body portion hermetically welded to the container, and further has a conductive pin insulated from the main body portion by a glass seal.
For such compressor refrigerants, the number of compressors that use alternative refrigerants has been increasing year by year due to environmental protection. Especially in compressors that use CO2 refrigerant, the high-pressure chamber has an extremely high pressure exceeding 10 MPa, and The point is to ensure the pressure strength. Incidentally, in the conventional structure, when an excessive pressure is applied, the glass seal portion of the motor electrical terminal is broken and the refrigerant leaks to the outside, so this portion is the portion with the weakest pressure resistance. Therefore, in order to increase the pressure resistance of the entire sealed container, it is necessary to reinforce the pressure resistance of the motor electrical terminal portion.
[0003]
5 and 6 show a general example of the structure near the motor electrical terminal portion of a conventional hermetic electric compressor. The overall configuration of the compressor itself is shown in FIGS. 1 and 2 for the compressor according to the embodiment of the present invention, but the conventional hermetic electric compressor and the compressor of the present invention are the same. Yes, this will be described later in this specification. Here, only the structure of the motor electric terminal portion of the conventional hermetic electric compressor, which is particularly related to the present invention, will be described.
[0004]
Electric power is supplied to the motor unit 3 of the hermetic electric compressor from the outside through a cable, and the cable passes through the front casing 12 of the compressor and is connected to an external power source (not shown).
A relatively flexible lead wire 3a extends from the motor unit 3, and the lead wire 3a is then connected to a linear conductive pin 15a. The conductive pin 15a extends straight as it is, and the front casing of the compressor. 12 is connected to the cable. An opening is provided in the central portion of the front casing 12, and the conduction pin 15 a passes through this opening, and a ring 16 is provided in a portion where the conduction pin 15 a passes through the front casing 12. The inner periphery of the ring 16 is molded with an epoxy resin mold 17. The resin mold 17 has a certain degree of elasticity.
[0005]
As shown in FIG. 5, the main body portion 15 b of the motor electrical terminal portion 15 is welded and fixed to the front casing 12 so as to support the conduction pin 15 a, and a glass is interposed between the main body portion 15 b and the conduction pin 15 a. The seal portion 15c is installed so as to be buried for insulation. In the hermetic electric compressor, the circulating refrigerant gas flows from the suction pipe 5 into the pressure vessel of the compressor, and the motor unit 3 is cooled by the low-temperature sucked refrigerant gas. The refrigerant gas is then sucked by the compression unit.
Here, due to the configuration of the mold 17 and the glass seal portion 15c, the through portion of the conduction pin 15a is insulated and sealed.
[0006]
Since the refrigerant gas passes, the pressure of the refrigerant gas acts in the casing of the compressor, which is a hermetic container, and a high pressure acts when CO2 is used as the refrigerant as described above. In the conventional hermetic electric compressor shown in FIG. 5, the ring 16 is press-fitted and fixed to the front casing 12, and when an excessive pressure is applied in this way, the pressure acts on the main body 15b. Then, it is transmitted to the mold 17 and the ring 16, and the ring 16 moves with respect to the front casing 12 as shown in FIG. 6, and as a result, the main body portion 15b of the motor electrical terminal portion 15 is deformed, An excessive force is applied to the glass seal portion 15c between the conductive pins 15a, cracking occurs, and the refrigerant leaks.
[0007]
In the conventional literature, there has been proposed a structure in the vicinity of the motor electrical terminal portion of the hermetic electric compressor (see, for example, Patent Document 1). However, in the proposal of this document, attention is not paid to breakage of an insulating seal such as a glass seal disposed around a sealed terminal portion such as a conductive pin, and therefore, a structure for preventing breakage such as cracking of the glass seal portion is used. is not.
Further, there is a conventional document that proposes a structure for preventing leakage of refrigerant gas in the vicinity of a motor electric terminal portion of a hermetic electric compressor (see, for example, Patent Document 2). In this case, the displacement of the sealing terminal such as the conduction pin is allowed, and the motor electrical terminal portion has a structure that allows the displacement of the conduction pin, which is a relatively complicated structure.
[Patent Document 1]
JP 2000-2182 (5th page)
[Patent Document 2]
Japanese Patent Laid-Open No. 11-289707 (page 5)
[0008]
[Problems to be solved by the invention]
As described above, in the prior art, particularly in a high-pressure hermetic electric compressor, the motor electrical terminal portion is deformed by the pressure in the container, causing a crack in the seal portion of the motor electrical terminal portion, thereby causing refrigerant leakage. It was necessary to solve the problem.
The present invention has been made in view of the above-described circumstances, and in particular, in a high-pressure hermetic electric compressor, the deformation of the motor electrical terminal portion due to the pressure in the container is suppressed, and the seal portion of the motor electrical terminal portion is cracked. An object of the present invention is to provide a hermetic electric compressor having a motor electric terminal portion having high pressure resistance reliability of the entire container and relatively simple structure by preventing breakage and preventing leakage of refrigerant.
[0009]
[Means for Solving the Problems]
[0011]
According to a first aspect of the present invention, a hermetic electric compressor includes a casing for housing a compressor component with a shell of the compressor, a compressor for compressing fluid, and an electric A motor unit that rotates and drives the compression unit via a rotating shaft, a motor electrical terminal unit that is connected to the motor unit to supply electricity to the motor unit, and the motor electrical terminal unit so as to pass through the center, high and cylindrical shaped ring portion which is and secured to the casing have to guide it, so as to fill a space between the motor electrical terminal portion passing through the inner and the ring portion And a sealing portion to be provided. By the ring portion has at least one recess on the inner peripheral side thereof, the movement or deformation of the motor electrical terminal portion Ru is suppressed. The sealing part is made of an epoxy resin. The motor electrical terminal portion is interposed between the body portion supporting the motor electrical terminal portion itself, a conduction pin connected to a lead wire extending from the motor portion, a cable connected to the conduction pin, and the conduction pin and the body portion. A glass seal portion that insulates and seals between them. The recess is located closer to the motor part than the connection part between the conduction pin and the cable.
[0012]
By configuring in this way, at least one recess provided in the ring portion has a structure in which an object (mold) disposed therein is difficult to slide and move, so even when excessive pressure is applied The motor electric terminal portion arranged in the ring portion is not deformed so much and is difficult to act to damage the glass seal portion. Therefore, the pressure resistance strength of the whole sealed container is improved, and a highly reliable hermetic electric compressor can be provided. Also, the structure of the motor electrical terminal is relatively simple.
[0015]
According to a second aspect of the present invention, in the first aspect, the casing is connected to the suction pipe for the fluid to be compressed and the suction pipe connected to the suction pipe and located upstream of the compression section. A chamber. The motor electric terminal portion is disposed in the suction chamber.
By configuring in this manner, a highly reliable hermetic electric compressor can be provided by disposing the electric terminal portion on the suction chamber side having a relatively low pressure inside the compressor.
[0017]
According to a third aspect of the present invention, in the first or second aspect, the hermetic electric compressor is used for a refrigerator such as an air conditioner using CO2 as a refrigerant.
In the form of claim 3 , the application of the present invention is more concrete.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a hermetic electric compressor according to the present invention will be described in detail with reference to the drawings.
1 and 2 are schematic drawings of a hermetic electric compressor according to a reference example of the present invention, FIG. 1 is a cross-sectional view of the whole compressor, and FIG. 2 particularly shows details of a motor electric terminal portion. It is sectional drawing. The compressor of this reference example is a scroll type and is a compressor of an air conditioner for a vehicle or the like. The compressor includes a cylindrical casing 11 that surrounds the entire compressor, a front casing 12 that is lid-like at both ends (upper part in FIG. 1), and a rear casing 13 (lower part in FIG. 1). Since these are joined to the casing 11 so as to be sealed by welding, the pressure vessel 1 is formed. However, you may join so that it may seal by another method. In the casing 11, a motor part 3 as a driving part is provided at the front part, a middle housing 6 constituting the central part of the casing 11 is provided at the center part, and a compression part 2 for compressing the refrigerant gas is provided at the rear part. The
[0019]
The motor unit 3 includes a stator fixed to the casing 11, an armature composed of a plurality of permanent magnets therein, and a rotating shaft 4 passing through the center inside thereof. The armature is fixedly supported on the rotating shaft 4, and the rotating shaft 4 is rotatably supported by the front casing 12 and the middle housing 6 through bearings.
[0020]
The crank-shaped end of the rotating shaft 4 is connected to the compression unit 2 via a revolution drive unit, and transmits the driving force of the motor unit 3 to the compression unit 2. The fixed scroll 22 is fixed to the middle housing 6, and a rotation prevention mechanism 23 is provided between the fixed scroll 22 and the end plate of the orbiting scroll 21 to allow only the revolution of the orbiting scroll 21 and prevent rotation. . The orbiting scroll 21 has a spiral blade portion and an end plate, and the fixed scroll 22 has a spiral blade portion and an end plate that mesh with the spiral blade portion of the orbiting scroll 21. The compression unit 2 includes a turning scroll 21, a fixed scroll 22, the revolution drive unit, and the like.
[0021]
With the above configuration, when the rotating shaft 4 rotates, the rotational force is transmitted to the orbiting scroll 21 via the end of the rotating shaft 4, the bush, and the bearing. Since the end portion is eccentric with respect to the rotating shaft 4 and the rotation of the orbiting scroll 21 is prevented by the rotation prevention mechanism 23, the transmitted rotational force causes the spiral orbiting scroll 21 to be fixed in a spiral shape. Revolve with respect to the scroll 22. At this time, a working chamber is formed between the orbiting scroll 21 and the fixed scroll 22, and the working chamber follows the revolving motion of the orbiting scroll 21 so that its volume continuously decreases from the outer peripheral side toward the center. Since the refrigerant gas moves, the refrigerant gas sucked from the outer peripheral side of the working chamber is compressed, and is discharged into the discharge chamber 8 formed by the plate 7 and the fixed scroll 22 through the discharge port provided in the center of the fixed scroll 22. Then, it is discharged to the outside of the compressor via the discharge pipe 9. In this way, the compressor is operated by the rotation of the motor.
[0022]
The front casing 12 is provided with a suction pipe 5 as shown in FIG. 1, and the suction pipe 5 communicates with an external refrigerant circuit (not shown). The refrigerant gas compressed by the compressor is an external refrigerant. It recirculates from the suction pipe 5 to the compressor via the circuit. The flow of the refrigerant gas flows from the suction pipe 5 into the pressure vessel 1 and cools the motor unit 3 with the low-temperature suction refrigerant gas. Thereafter, the refrigerant flows from the refrigerant passage (not shown) of the motor portion 3 to the compression portion 2 through the refrigerant passage (not shown) of the middle housing 6. The flow of the refrigerant is as described above, and the pressure vessel 1 of the compressor is filled with high-pressure refrigerant gas.
[0023]
Here, the structure in the vicinity of the motor electrical terminal portion 15, which is a cable connection portion to the motor portion 3 related to the present invention, will be described with reference to FIGS. 1 and 2. Referring now to the drawings, and more particularly to FIGS. 1 and 2, the elements of FIGS. 1 and 2 are the same as or similar to the elements of the prior art hermetic electric compressor example disclosed in FIGS. Element parts are designated by the same reference numerals.
[0024]
Referring to FIG. 2, a motor electrical terminal portion 15 connected to an external power source (not shown) is welded and fixed to the front casing 12, and a lead wire 3a extending from the motor portion 3 is connected to a conduction pin 15a. Has been. Further, a cylindrical ring 16 that guides the motor electrical terminal 15 so as to surround it is provided, and the ring 16 is welded and fixed to an opening provided in the front casing 12. A mold (sealing portion) 17 is formed on the inner peripheral side of the ring 16 by molding with an epoxy resin. In the present embodiment, since the motor section 3 is supplied with a three-phase current, three cables, and thus three conduction pins 15 a pass through the front casing 12 and the ring 16. Therefore, the conductive pin 15a penetrates the epoxy resin mold 17 in a molded state. The number of cables, that is, the number of conductive pins 15a may be other than three. The mold 17 may be formed of an appropriate material other than an epoxy resin. The ring 16 may have a cylindrical shape other than the cylindrical shape.
[0025]
The motor electrical terminal portion 15 includes a main body portion 15b that supports the motor electrical terminal portion 15 itself in addition to the lead wire 3a and the conduction pin 15a, and a glass seal portion 15c. The glass seal portion 15c is electrically conductive. It is inserted between the pin 15a and the main body 15b to insulate and seal between them.
The main body portion 15b is pressed outward by the casing internal pressure when the pressure vessel 1 has a high pressure. However, since the ring 16 cannot be moved by being fixed to the front casing 12 by welding, the ring 16 functions so as not to move, and deformation of the main body portion 15b is suppressed. Accordingly, the force acting on the glass seal portion 15c is also alleviated.
[0026]
A hermetic electric compressor according to a second reference example of the present invention will be described with reference to FIGS. 3 is a cross-sectional view of the entire compressor corresponding to FIG. 1, and FIG. 4 is a detailed cross-sectional view of a motor electric terminal portion corresponding to FIG. The compressor of the second reference example is also a scroll type. Referring now to the drawings, and more particularly to FIGS. 3 and 4, the elements of FIGS. 3 and 4 that are the same as or similar to the elements of the reference example of the hermetic electric compressor disclosed in FIGS. Parts are designated by the same reference signs.
[0027]
In the second reference example , a recess 161 is formed on the inner surface of the cylindrical ring 16 as can be seen from FIG. The difference from the reference example is that the recess 161 is provided.
The outer peripheral side of the ring 16 is press-fitted and fixed to the front casing 12, and the inner peripheral side is filled and molded with a mold 17 made of an epoxy resin. When excessive pressure is applied, the main body portion 15b tends to deform, and even when the ring 16 does not move, there is a possibility that the mold 17 may move and the main body portion 15b may be deformed. By adopting, the resin of the mold 17 that has entered the recess 161 prevents the movement of only the mold 17 and suppresses deformation.
In the second reference example , one recess 161 is provided at the center of the inner surface of the ring 16, but a plurality of recesses 161 may be provided. In an embodiment of the present invention, the recess 161 may be provided not at the center of the inner surface of the ring 16 but at the end of the inner surface of the ring 16 on the main body 15b side as shown in FIG.
[0028]
As a third reference example of the present invention, a combination of the reference example and the second reference example can be considered. That is, in the second reference example shown in FIG. 4, the ring 16 is fixed to the front casing 12 by welding. In the third reference example , the ring 16 is fixed to the front casing 12 by welding, so that the ring 16 does not move or displace relative to the front casing 12, and the mold 17 moves or displaces relative to the ring 16. Therefore, the movement or displacement of the main body portion 15b is more surely prevented and the glass seal portion 15c is reliably prevented from being broken or broken.
[0029]
Next, effects and operations of the above embodiment will be described.
The following effects can be expected from the compressor of the above reference example of the present invention.
・ The compressor ring is welded and fixed to the front casing to prevent deformation of the motor electrical terminal even when an excessive load is applied, and the glass seal that is the seal of the motor electrical terminal Makes it harder to work with damage.
・ This prevents leakage of refrigerant due to breakage of the glass seal.
-Furthermore, it is possible to provide a hermetic electric compressor having a relatively simple structure with improved pressure resistance performance as a whole compressor and high reliability.
[0030]
The following effects can be expected from the compressor according to the embodiment of the present invention.
-The motor recesses provided in the compressor ring make it difficult for the mold to move or displace relative to the ring, so the main body part is difficult to deform, so that even if an excessive load is applied, the motor electrical terminal The structure which suppresses a deformation | transformation of a part makes it difficult to work the force which damages the glass seal part which is a seal part of a motor electric terminal part.
・ This prevents leakage of refrigerant due to breakage of the glass seal.
-Furthermore, it is possible to provide a hermetic electric compressor having a relatively simple structure with improved pressure resistance performance as a whole compressor and high reliability.
[0031]
The following effects can be expected from the compressor of the third reference example of the present invention.
-The effect of the reference example is further enhanced by combining the above reference example and the second reference example .
[0032]
Moreover, although the example of the scroll compressor is shown in the present embodiment, the present invention can be similarly applied to other than the scroll compressor.
In the above description of the embodiment, the hermetic electric compressor of the present invention has been described for an air conditioner, but is not limited thereto.
[0033]
The above-described embodiment is an example of the present invention, and the present invention is not limited by the embodiment, and is defined only by matters described in the claims, and other embodiments are also possible. It can be implemented.
[Brief description of the drawings]
FIG. 1 is a schematic overall cross-sectional view of a hermetic type electric scroll compressor according to a reference example of the present invention.
FIG. 2 is an enlarged cross-sectional view of the vicinity of a motor electrical terminal portion of the compressor of FIG.
FIG. 3 is a schematic overall cross-sectional view of a hermetic electric scroll compressor according to a second embodiment of the present invention.
Figure 4 is an enlarged cross-sectional view in the vicinity of the motor electrical terminal portion of the compressor of FIG.
FIG. 5 is an enlarged cross-sectional view of a motor electric terminal portion of an example of a conventional hermetic electric compressor.
6 is the same drawing as the enlarged cross-sectional view of the vicinity of the motor electrical terminal portion of the compressor of FIG. 5, in which the body portion of the motor electrical terminal portion is deformed by internal pressure and a glass seal portion is cracked It is an illustration figure which shows the state.
FIG. 7 is a drawing similar to FIG. 4, and is a schematic enlarged sectional view of one embodiment of the present invention.

Claims (3)

In a hermetic electric compressor, this compressor is
A casing for enclosing the compressor components in an outer shell of the compressor in a sealed manner;
A compression section for compressing the fluid;
A motor unit that is supplied with electricity from the outside and rotates to drive the compression unit via a rotating shaft;
A motor electrical terminal connected to the motor for supplying electricity to the motor;
Wherein as the motor electrical terminal portion passes through the center, and cylindrical shaped ring portion which is and secured to the casing has guide it,
A sealing portion disposed so as to fill a space between the ring portion and the motor electric terminal portion passing through the ring portion;
It has
The ring portion has at least one recess on the inner peripheral side thereof, so that movement or deformation of the motor electric terminal portion is suppressed ,
The sealing part is made of epoxy resin,
The motor electrical terminal portion includes a body portion that supports the motor electrical terminal portion itself, a conduction pin connected to a lead wire extending from the motor portion, a cable connected to the conduction pin, and between the conduction pin and the body portion. A glass seal portion that is interposed between the glass seal and insulates and seals between them,
The compressor is characterized in that the recess is located closer to the motor part than a connection part between the conduction pin and the cable . The casing includes a suction pipe for fluid to be compressed, and a suction chamber that is connected to the suction pipe and is located upstream of the compression section.
The compressor according to claim 1, wherein the motor electrical terminal portion is disposed in the suction chamber. The compressor according to claim 1 or 2 , wherein the hermetic electric compressor is for a refrigerator such as an air conditioner using CO2 as a refrigerant.

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