JPH0849680A - Hermetic compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a hermetic compressor capable of preventing leakage and ensuring sufficient safety while suppressing the outflow of lubricating oil. [Structure] Since the tab 62 of the overcurrent relay 60 is bent in a substantially L-shape in the circumferential direction around the discharge pipe 5, the terminal portion 16 to which the overcurrent relay 60 is attached is adjacent to the discharge port 3. Receptacle 61, even in position
Even if the tab 62 and the tab 62 are arranged substantially along the radial direction of the closed case 1, the receptacle 41a connected to the tab 62 is connected.
Does not overlap the position of the discharge pipe 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor containing an overcurrent relay.

[0002]

2. Description of the Related Art A hermetic compressor used in a refrigerating cycle such as an air conditioner is provided with an electric motor part in an upper part and a compressor part in a lower part of a hermetic case, and a refrigerant (gas refrigerant) compressed by the compressor part is supplied. It is led to the upper space in the closed case, and then discharged from the discharge pipe on the upper side of the closed case to the outside (during the refrigeration cycle). Lubricating oil is contained in the bottom portion of the closed case, and the lubricating oil secures the mechanical lubricating action of the compressor and cools the compressor.

As an example of this hermetic compressor, there is one that accommodates an overcurrent relay as shown in FIG. In FIG. 5, reference numeral 1 denotes a closed case, which is composed of a bottomed and cylindrical case body 1a having an opening at the top, and an upper case 1b closing the upper opening of the case body 1a. A suction pipe 4 is provided at the bottom of the case body 1a, and the upper case 1
The discharge pipe 5 is provided substantially in the center of b. From the discharge pipe 5 to the suction pipe 4, a refrigeration cycle for an air conditioner is constructed in which a condenser, a decompression device, and an evaporator are sequentially connected by piping.

An electric motor section (single-phase motor) 10 is provided in the upper part of the closed case 1. The electric motor unit 10 includes a stator 11 and a rotor 12 provided inside the stator 11. A large number of slots are arranged on the inner peripheral surface of the stator 11, and windings (main winding and auxiliary winding) 13 are embedded and mounted in these slots. The rotor 12 is rotatably supported by the shaft 15.

A terminal portion 16 is provided in the vicinity of the discharge pipe 5 in the upper case 1b forming one end of the upper portion of the closed case 1. The terminal portion 16 is provided in a state of being embedded in the upper case 1b, and has three rod-shaped terminals 17, 18 and 19 facing from the inside to the outside of the upper case 1b. In addition, in FIG. 5, the terminal 19 is hidden by the terminal 18 and is invisible.

The terminals 17, 18 and 19 are equipped with metal plates 17a, 18a and 19a, respectively. Also,
The terminals 17, 18, and 19 are in a state of being put into the glass 20 in order to electrically insulate each other from each other in the terminal portion 16, and are generally called sealed terminals.

In the sealed case 1, an overcurrent relay 30 is housed at a position corresponding to the terminal portion 16. As shown in FIG. 6, the overcurrent relay 30 is plugged into a plastic main body case 30b, which is a receptacle 31 which is a first terminal and which is detachable and a receiving terminal, and a detachable which is a second terminal. Tab 32, which is the side terminal
, And both terminals are electrically connected to the electric circuit in the main body case via the lead rod 33. The electric circuit in the main body case has a function of forming an energization path between the receptacle 31 and the tab 32 and interrupting the energization path when an overcurrent flows through the energization path.

FIG. 7 shows the upper case 1b viewed from the inside (lower side). The metal plate 17a of the terminal 17 on the center side of the case in the terminal portion 16 is fitted into the receptacle 31. By this fitting, the overcurrent is prevented. The relay 30 is held by the terminal portion 16.

Further, in the hermetically sealed case 1, the winding 13 of the stator 11 of the electric motor unit 10 to the three lead wires 4 are
1, 42, 43 are led out, and receptacles 41a, 42 are provided at the tips of these lead wires as lead wire terminals, respectively.
a and 43a are attached. In the figure, the lead wire 4
3 and the receptacle 43a are hidden and invisible.

The tab 32 of the overcurrent relay 30 is fitted in the receptacle 41a, and by this fitting, the terminal 17 of the terminal portion 16 and the winding 13 of the stator 11 are fitted together.
It will be in the state electrically connected via. Further, the metal plates 18a, 19a of the terminals 18, 19 in the terminal portion 16
Are respectively fitted into the receptacles 42a and 43a, and by this fitting, the windings 1 of the terminals 18 and 19 and the stator 11 are
3 and 3 are electrically connected.

Therefore, when an overcurrent flows through the winding 13 of the motor unit 10 due to overload operation or the like, the overcurrent relay 30 is actuated to cut off the power supply between the terminal 17 and the winding 13. Due to this interruption, the operation of the electric motor unit 10 is stopped, and the burnout of the winding 13 is prevented in advance.

On the other hand, the compressor section 5 is provided at the bottom of the closed case 1.
0 is provided. The compressor section 50 is the same as the shaft 1 described above.
It has a main bearing 51 and a sub bearing 52 for supporting 5, and a cylinder 53 between the main bearing 51 and the sub bearing 52. An eccentric roller 54 is provided in the cylinder 53, and the eccentric roller 54 forms a compression chamber 55. The suction pipe 4 is communicated with the compression chamber 55. Also, the cylinder 5
3, the discharge port 56 is formed at a position corresponding to the compression chamber 55.

That is, when the motor portion 10 is driven and the shaft 15 rotates, the eccentric roller 54 of the compressor portion 50 is rotated.
Rotates, and suction pressure is generated in the compression chamber 55. The suction pressure causes the refrigerant (gas) to flow from the suction port 2 into the compression chamber 55. The inflowing refrigerant is compressed as it is in the compression chamber 55, and is discharged from the discharge port 56 into the closed case 1 through the muffler valve case. The discharged refrigerant flows into the upper space in the hermetically sealed case 1 through the air gap of the electric motor unit 10 and the gaps such as the slots of the stator or the gas communication passages provided in the rotor and the stator, and flows out from the discharge pipe 5. .

Lubricating oil is contained in the bottom of the closed case 1. This lubricating oil is for ensuring the mechanical lubrication action of the compressor section 50 and for cooling the compressor section 50. It should be noted that the lubricating oil is not always stored in the bottom portion, and as the compressor unit 50 is driven and the refrigerant is discharged from each of the discharge ports 56, a part thereof becomes a mist and the hermetically sealed case 1 is formed. It is blown up inside and floats in the upper space.

The floating lubricating oil falls to the bottom through the oil return passage between the electric motor portion 10 and the inner peripheral surface of the case under the influence of gravity, but a part of the lubricating oil remains with the refrigerant through the discharge pipe 5. It leaks to the outside. The refrigerant that has flowed out circulates in the refrigeration cycle and eventually returns to the compressor.

[0016]

When the amount of lubricating oil flowing out from the discharge pipe 5 increases, the amount of lubricating oil remaining in the closed case 1 tends to decrease, and the lubricating action of the compressor section 50 is hindered. Alternatively, the cooling action on the compressor unit 50 is impaired.

Therefore, as shown in FIG. 5, a measure is taken so that the discharge pipe 5 is deeply inserted into the closed case 1. That is, the lubricating oil flowing in the upper space in the closed case 1 is sprayed on the inner surface of the upper case 1b. At this time, if the opening of the discharge pipe 5 is close to the inner surface of the upper case 1b, a lot of lubricating oil flows into the opening of the discharge pipe 5, but the discharge pipe 5 extends inwardly of the case, and the opening is opened. The amount of lubricating oil flowing into the discharge pipe 5 decreases as the distance from the inner surface of the nozzle increases. By utilizing this phenomenon, the amount of lubricating oil flowing out from the discharge pipe 5 is suppressed, and the above-mentioned problems are eliminated.

However, the terminal portion 16 to which the overcurrent relay 30 is attached is located adjacent to the discharge pipe 5,
Moreover, the receptacle 31 and the tab 32 of the overcurrent relay 30
7 are arranged so as to project to the center side substantially along the radial direction of the closed case 1, and as shown in FIG. 7, the position where the receptacle 41a connected to the tab 32 just overlaps with the peripheral portion of the discharge pipe 5. Will exist.

Therefore, when the discharge pipe 5 is deeply inserted into the closed case 1 as described above in order to suppress the outflow amount of the lubricating oil, the discharge pipe 5 comes into contact with the receptacle 41a,
There is a risk of leakage.

The present invention takes the above circumstances into consideration,
An object of the hermetic compressor of both the first invention and the second invention is to prevent leakage of electric current and ensure sufficient safety while suppressing the outflow amount of lubricating oil.

[0021]

A hermetic compressor according to a first aspect of the present invention includes a hermetic case having a discharge pipe at one end, an electric motor section and a compressor section provided in the hermetic case, and a hermetic case of the hermetic case. Provided in the vicinity of the discharge pipe at one end,
A terminal portion having a terminal facing from the inner side to the outer side of the closed case, and housed in the closed case, and each protruding in a radial direction about the discharge tube substantially along a circumferential direction about the discharge tube. It has a first terminal and a second terminal, the first terminal is attached to a terminal of the terminal portion, the second terminal is connected to a lead wire terminal from the electric motor portion, and the first terminal is connected to the second terminal. And an overcurrent relay that cuts off the current flow between the two terminals when the current flowing through the terminal exceeds a predetermined value. The second terminal of the overcurrent relay is bent into a substantially L shape in the circumferential direction.

In the hermetic compressor of the second invention, a hermetic case having a discharge pipe at one end, an electric motor part and a compressor part provided in the hermetic case, and the discharge pipe at one end of the hermetic case. And a terminal portion having a plurality of terminals facing from the inside to the outside of the sealed case and each of the discharge tubes housed in the sealed case and substantially in the circumferential direction around the discharge tube. It has a first terminal and a second terminal that protrude in the radial direction around the center, and the first terminal is attached to the terminal closest to the center of one end of the case among the terminals of the terminal portion, and the second terminal is An overcurrent relay, which is connected to a lead wire terminal from the electric motor unit and cuts off energization between both terminals when a current flowing between the first terminal and the second terminal exceeds a predetermined value, The second terminal of the Pot was bent in an L-shape.

[0023]

In any of the hermetic compressors according to the first and second aspects of the present invention, the second terminal of the overcurrent relay is bent into a substantially L-shape in the circumferential direction around the discharge pipe. The position of the lead wire terminal connected to the two terminals does not overlap with the position of the discharge pipe.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same parts as those in FIGS. 5 and 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, an overcurrent relay 60 shown in FIG. 2 is adopted in place of the conventional overcurrent relay 30.
This overcurrent relay 60 holds a receptacle 61, which is a first terminal, and a tab 62, which is a second terminal, in a main body case, and these terminals are respectively connected to the lead rod 6
It is electrically connected to the electric circuit in the main body case via 3.
The electric circuit inside the body case is composed of the receptacle 61 and the tab 6.
An energization path is formed between the energization path 2 and the contact point 2 via a contact 60a, which will be described later, and has a function of shutting off the energization path when an overcurrent flows through the energization path.

FIG. 1 is a view of the upper case 1b of the compressor viewed from the inside (lower side). The metal plate 17a of the terminal 17 in the terminal portion 16 is fitted into the receptacle 61 of the overcurrent relay 60, and this fitting is performed. Thus, the overcurrent relay 60 is held by the terminal portion 16. Here, the terminals 17 are the other terminals 1 in the radial direction of the closed case 1.
The position closest to the center compared to 8 and 19, that is, the discharge pipe 5
It is in the position closest to.

Also, the receptacle 6 of the overcurrent relay 60
1 and the tab 62 are arranged substantially along the circumferential direction centered on the discharge pipe 5 and are in a state of protruding in the radial direction centered on the discharge pipe 5, and the tab 62 is a receptacle 61.
It is bent in a substantially L-shape in the circumferential direction in a direction away from.

FIG. 3 shows the inside of the case body 1a viewed from the opening side (upper side), and three lead wires 41, 42, 43 are led out from the winding 13 of the stator 11 of the electric motor section 10, Receptacles 41a, 42a, 43a are attached to the tips of these lead wires as lead wire terminals, respectively.

Then, the tab 62 of the overcurrent relay 60 is fitted into the receptacle 41a of the lead wire, and by this fitting, the terminal 17 of the terminal portion 16 and the winding 13 of the stator 11 are passed through the overcurrent relay 60. It is in an electrically connected state. Further, the metal plates 18a and 19a of the terminals 18 and 19 in the terminal portion 16 are connected to the receptacles 42a and 4a, respectively.
3a, and the terminals 18 and 19 and the winding 13 of the stator 11 are electrically connected by this fitting.

By these connections, the control circuit shown in FIG. 4 mainly including the hermetic compressor is constructed. That is, the terminal 17 of the terminal portion 16 is connected to one end of the commercial AC power supply 70 via the contact 71 of an electromagnetic contactor (not shown) for controlling the compressor. The terminal 19 of the terminal portion 16 is connected to the other end of the commercial AC power supply 70. Then, the terminal 1 of the terminal portion 16
An operating capacitor 72 is connected between the terminal 9 and the terminal 18, and an electronic starter 73 for starting the motor is connected in parallel with the operating capacitor 72.

Looking inside the hermetically sealed case 1, the winding 13 of the motor section 10 is composed of a main winding M and an auxiliary winding A, and the main winding M is connected to the overcurrent relay 60 and the contactor contact 71. Is connected to the commercial AC power supply 70, and the auxiliary winding A is connected to the main winding M in parallel via the operating capacitor 72 and the electronic starter 73.

The overcurrent relay 60 has a built-in contact 60a. The contact 60a opens by self-heating when an overcurrent of a predetermined value or more flows. According to such a configuration, the main winding M is turned on by turning on the contactor contact 71.
And a current flows through the auxiliary winding A, and the electric motor unit 10 is started. When an overcurrent flows through the main winding M and the auxiliary winding A for some reason, the contact 60a of the overcurrent relay 60 opens and the main winding M and the auxiliary winding A are de-energized. Due to this interruption, the electric motor unit 10 is stopped, and the main winding M and the auxiliary winding A are prevented from being burnt out.

On the other hand, looking at the positional relationship between the receptacle 41a connected to the tab 62 of the overcurrent relay 60 and the discharge pipe 5, the tab 62 is away from the receptacle 61, and the circumferential direction is centered on the discharge pipe 5. Since it is bent into a substantially L-shape, even if the terminal portion 16 to which the overcurrent relay 60 is attached is located adjacent to the discharge pipe 5,
Further, even if the receptacle 61 and the tab 62 are arranged substantially along the radial direction of the closed case 1, the receptacle 41a
The position of does not overlap the position of the discharge pipe 5.

Therefore, even if the discharge pipe 5 is deeply inserted into the closed case 1 in order to suppress the outflow amount of the lubricating oil, the discharge pipe 5 does not come into contact with the receptacle 41a. That is, while preventing electric leakage from the discharge pipe 5 and ensuring sufficient safety, the outflow amount of the lubricating oil is suppressed and a good lubricating action of the compressor unit 50 and a sufficient cooling action for the compressor unit 50 are secured. To be done. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

[0035]

As described above, in the hermetic compressor of the first invention, the hermetic case having the discharge pipe at one end, the electric motor section and the compressor section provided in the hermetic case,
A terminal portion that is provided in the vicinity of the discharge pipe at one end of the sealed case and has a terminal that faces the outside from the inside of the sealed case; and a terminal portion that is housed in the sealed case and that is substantially circumferentially centered around the discharge pipe A first terminal and a second terminal, each of which protrudes in the radial direction around the discharge pipe, the first terminal being attached to the terminal of the terminal portion, and the second terminal being a lead wire from the motor portion. Connected to the terminals, the first terminal and the second
An overcurrent relay that cuts off current flow between the terminals when the current flowing between the terminals and the terminal exceeds a predetermined value, and bends the second terminal of the overcurrent relay in the circumferential direction into a substantially L shape.
As a result, the position of the lead wire terminal connected to the second terminal does not overlap with the position of the discharge pipe, so that it is possible to prevent leakage and ensure sufficient safety while suppressing the amount of lubricating oil flowing out.

In the hermetic compressor of the second invention, a hermetic case having a discharge pipe at one end, an electric motor part and a compressor part provided in the hermetic case, and the discharge pipe at one end of the hermetic case. And a terminal portion having a plurality of terminals facing from the inside to the outside of the sealed case and each of the discharge tubes housed in the sealed case and substantially in the circumferential direction around the discharge tube. It has a first terminal and a second terminal that protrude in the radial direction around the center, and the first terminal is attached to the terminal closest to the center of one end of the case among the terminals of the terminal portion, and the second terminal is An overcurrent relay, which is connected to a lead wire terminal from the electric motor unit and cuts off energization between both terminals when a current flowing between the first terminal and the second terminal exceeds a predetermined value, The second terminal of the Crucible bent in an L-shape, whereby the second
Since the position of the lead wire terminal connected to the terminal does not overlap the position of the discharge pipe, leakage of oil can be suppressed while preventing leakage and ensuring sufficient safety. Further, since the overcurrent relay is provided near the center of the case, the mounting space for the overcurrent relay can be widened, and the assembling workability in manufacturing is also good.

[Brief description of drawings]

FIG. 1 is a diagram of a main part of an embodiment of the present invention viewed from the inside (lower side) of an upper case.

FIG. 2 is a configuration diagram of an overcurrent relay in the embodiment.

FIG. 3 is a view of the main part of the embodiment as viewed from the opening side (upper side) of the case body.

FIG. 4 is a configuration diagram of a control circuit according to the embodiment.

FIG. 5 is a configuration diagram of an internal mechanism of the hermetic compressor of the embodiment and a conventional hermetic compressor.

FIG. 6 is a configuration diagram of a conventional overcurrent relay.

FIG. 7 is a view of a main part of a conventional hermetic compressor seen from the inside (lower side) of an upper case.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sealed case, 1a ... Case main body, 1b ... Upper case, 3 ... Discharge port, 5 ... Discharge pipe, 10 ... Electric motor part, 13
... Windings (main winding M and auxiliary winding A), 41, 42, 4
3 ... Lead wire, 41a, 42a, 43a ... Receptacle (lead wire terminal), 50 ... Compressor part, 60 ... Overcurrent relay, 60a ... Contact, 61 ... Receptacle (first terminal),
62 ... Tab (second terminal).

Claims (2)

[Claims] 1. A hermetically sealed case having a discharge pipe at one end, a motor section and a compressor section provided in the hermetically sealed case, and a hermetically sealed case provided at one end of the hermetically sealed case near the discharge tube. A terminal portion having a terminal facing from the inner side to the outer side, and a first portion housed in the sealed case and projecting in a radial direction about the discharge pipe substantially along a circumferential direction about the discharge pipe. It has 1 terminal and a 2nd terminal, the 1st terminal is attached to the terminal of the said terminal part, the 2nd terminal is connected with the lead wire terminal from the said electric motor part, and between the 1st terminal and the 2nd terminal. An overcurrent relay that cuts off the conduction between both terminals when the flowing current exceeds a predetermined value, and the second terminal of this overcurrent relay is bent in a substantially L-shape in the circumferential direction. Compressor. 2. A hermetically sealed case having a discharge pipe at one end, an electric motor part and a compressor part provided in the hermetically sealed case, and a hermetically sealed case provided at one end of the hermetically sealed case near the discharge pipe. A terminal portion having a plurality of terminals facing from the inner side to the outer side, and housed in the hermetically sealed case, and projecting in a radial direction centered on the discharge pipe and substantially along a circumferential direction centered on the discharge pipe. A first terminal and a second terminal, the first terminal is attached to a terminal closest to the center of one end of the case among the terminals of the terminal section, and the second terminal is a lead wire from the electric motor section. An overcurrent relay that is connected to the terminal and that cuts off energization between the two terminals when the current flowing between the first terminal and the second terminal exceeds a predetermined value. Bent in a substantially L shape in the circumferential direction Hermetic compressor, characterized in that the.