JP2012082776A - Hermetic compressor and refrigeration cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor allowing connection of a connection wire to a hermetic terminal to be performed without applying excessive bending stress to the connection line and allowing connection work during manufacture to be performed efficiently, because when connection lines are connected to a plurality of hermetic terminals, a number of connection lines are arranged inside and outside the hermetic compressor, undergoing complication, excessive bending stress is applied to the connection lines due to connection of bent connection line or the like, and durability of the connection lines is reduced.SOLUTION: In the hermetic compressor including a hermetic case provided with a discharge pipe, a compression mechanism part disposed in the hermetic case to compress a refrigerant, an electric motor for driving the compression mechanism part, and a first hermetic terminal and a second hermetic terminal having three pins electrically connected to the electric motor, configured in the same shape, and juxtaposed in the hermetic case, pins of respective hermetic terminals are asymmetrically arranged with respect to a straight line passing through a center of the discharge pipe and a middle point of the first and second hermetic terminals.

Description

Embodiments described herein relate generally to a hermetic compressor and a refrigeration cycle apparatus.

The hermetic compressor is provided with a compression mechanism section and an electric motor for driving the compression mechanism section in a hermetic case. The electric motor is supplied with driving power from a power supply device such as an inverter device provided outside the sealed case to drive the compression mechanism. The power supply device and the electric motor are electrically connected by a sealing terminal for enabling connection without impairing the confidentiality of the sealed case and a connection line such as a lead wire.
Here, a plurality of connection lines are connected to one sealed terminal.
Moreover, the magnitude | size of the electric current which can supply with electricity is decided by the magnitude | size of the sealing terminal, and a plurality of sealing terminals may be used depending on the magnitude of the supplied current.

JP 2009-191822 A

As described above, when connecting connection lines to a plurality of sealed terminals, the number of connection lines arranged inside and outside the hermetic compressor is complicated, and depending on the connection situation, the connection lines are extremely curved and connected. For example, excessive bending stress is applied to the connecting wire, and the durability of the connecting wire is reduced. In addition, it is difficult to connect the connection lines when manufacturing the hermetic compressor.
According to the embodiment of the present invention, the connection of the connection line to the sealed terminal is performed without applying excessive bending stress to the connection line, and the reliability is high and the connection work at the time of manufacturing can be efficiently performed. Provide a hermetic compressor that can be used.

  According to the embodiment of the present invention, a sealed case provided with a discharge pipe, a compression mechanism unit that is disposed in the sealed case, compresses the refrigerant, an electric motor that drives the compression mechanism unit, and the electric motor are electrically connected. In a hermetic compressor having a first sealing terminal and a second sealing terminal, which are configured in the same shape and arranged in parallel in a hermetically sealed case, the center of the discharge pipe Three pins of each sealed terminal are arranged asymmetrically with respect to a straight line passing through the midpoint of the first and second sealed terminals.

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention. The top view and bottom view of the sealing terminal which concern on embodiment of this invention. The top view and sectional drawing of the connection terminal connected to a sealing terminal. The top view of the sealing terminal to which the connection terminal was connected. The top view of a hermetic compressor and the layout of a sealing terminal. The circuit diagram which shows the electric motor of a hermetic compressor. The top view showing the connection state of the sealing terminal of a hermetic compressor and an electric motor. The top view showing the other connection state of the sealing terminal of an airtight compressor, and an electric motor. The top view and bottom view showing the other arrangement | positioning state of the 1st sealing terminal of a hermetic compressor. 1 is a schematic view of a refrigeration cycle apparatus including a hermetic compressor according to an embodiment of the present invention.

An embodiment of the present invention will be described with reference to FIGS.
(First embodiment)

  FIG. 1 is a longitudinal sectional view showing a hermetic compressor 1.

  The hermetic compressor 1 includes a hermetic case 11 having a main body part 11b and an upper lid part 11a having a circular horizontal cross section, and an electric motor 12 and a compression mechanism part 13 are accommodated in the hermetic case 11, and the electric motor 12 The compression mechanism part 13 is connected via a rotating shaft 14 having an eccentric part 14a.

The electric motor 12 includes a rotor 12a and a stator 12b.
The stator 12b is provided with a winding La and is connected to lead wires 34 and 35 described later.

  The compression mechanism unit 13 is a rotary compressor and includes a cylinder 16 that forms a cylinder chamber 15. A roller 17 that rotates eccentrically is provided in the cylinder chamber 15. The cylinder 16 is provided with a blade (not shown) that reciprocates in contact with the outer peripheral surface of the roller 17 and partitions the inside of the cylinder chamber 15 into a suction chamber and a compression chamber.

  The cylinder chamber 15 is covered with a main bearing 21 and a sub bearing 23. The main bearing 21 and the sub bearing 23 are provided with discharge holes 24a and 24b and discharge valves 25a and 25b, respectively.

  A discharge pipe 26 for discharging compressed refrigerant gas is connected to the center of the upper surface of the upper lid portion 11 a of the sealed case 11, and a suction pipe 27 and an accumulator 28 are connected to the lower side of the side surface of the sealed case 11.

  Further, first and second sealing terminals 31 and 32 are juxtaposed on the upper surface of the upper lid portion 11 a of the sealing case 11, and are provided so as to face the inside and outside of the sealing case 11.

  FIG. 2A shows a top view of the first sealed terminal 31, and FIG. 2B shows a bottom view. The second sealing terminal 32 is formed in the same shape as the first sealing terminal 31, and the description of the shape is omitted.

The first sealing terminal 31 has a main body 51 formed in a substantially disc shape with the center point O as the center when viewed from above. The main body 51 is provided with three rod-like pins 52a, 52b, and 52c that are electrically connected to the electric motor.
The pins 52a, 52b, and 52c are arranged at the apexes of an equilateral triangle with the center point O as the center of gravity, and are arranged in the order of the pins 52a, 52b, and 52c in the clockwise direction when viewed from above.

  In this specification, the direction from the center point O toward the pin 52a is α, the direction from the center point O toward the pin 52b is β, and the direction from the center point O toward the pin 52c is γ. That is, in the top view, α, β, and γ are directions rotated by 120 ° clockwise.

  The three pins 52a, 52b, and 52c are provided with flat tabs 53 having an abdominal surface 53f and a back surface 53r on the upper surface side and the lower surface side of the first sealing terminal 31, respectively. Each tab 53 has pins 52a, 52b, and 52c joined to the abdominal surface 53f, and is formed so as to be able to be fitted to a connection terminal 61 described later.

On the upper surface side of the first sealed terminal 31 shown in FIG. 2A, the tab 53 joined to the pin 52a is provided so that the abdominal surface 53f is substantially parallel to the α direction. The tab 53 joined to the pin 52b is provided so that the abdominal surface 53f faces the center point O and is substantially orthogonal to the β direction. The tab 53 joined to the pin 52c is provided so that the back surface 53r faces the center point O and is substantially orthogonal to the γ direction.
Further, on the lower surface side of the first sealing terminal 31 shown in FIG. 2B, the tab 53 joined to the pin 52c is provided so that the abdominal surface 53f is substantially parallel to the γ direction. The tab 53 joined to the pin 52b is provided so that the abdominal surface 53f faces the center point O and is substantially orthogonal to the β direction. The tab 53 joined to the pin 52a is provided such that the back surface 53r faces the center point O and is substantially perpendicular to the α direction.

FIG. 3A shows a front view of the connection terminal 61, and FIG. 3B shows a bottom view of the connection terminal 61.
The connection terminal 61 has a terminal plate 61a formed in a substantially rectangular shape. Engagement portions 61b formed by folding are provided at both left and right ends of the terminal plate 61a, and are formed so as to be fitted to the tabs 53.
Further, a crimping part 61c for fixing the connecting wire 62 by crimping is provided on the upper part of the terminal board 61a. The crimping portion 61c can be fixed by inserting the connecting wire 62 only from the left side and crimping. Thereby, the extending direction of the connection line is limited to one direction of the connection terminal. That is, when the connection terminal 61 and the tab 53 are fitted, the connection line 62 extends to the left as viewed from the side of the abdomen 53f of the tab 53.

  Here, the connection line 62 is a power supply connection line 71 (72) connected to an inverter device as a power supply device (not shown) or a lead wire 34 (35) connected to the winding La of the motor 12. The connection line 62 connected to the upper surface side of the first sealed terminal 31 is a power supply connection line 71 (72), and the connection line 62 connected to the lower surface side is a lead wire 34 (35).

The power supply connection line 71 (72) and the lead wire 34 (35), which are the connection lines 62, are connected to the pins 52a, 52b, and 52c by the connection terminals 61 and the tabs 53.
Here, the direction in which the power supply connection line 71 (72) and the lead wire 34 (35) are extended from the pins 52a, 52b, 52c is the left direction when viewed from the side of the abdominal surface 53f of the tab 53.

That is, as shown in FIG. 4, the power supply connection line 71 (72) and the lead wire 34 (35) are connected to the pins 52 a and 52 b of the first sealing terminal 31 (second sealing terminal 32) via the connection terminal 61. , 52c, the power connection line 71 (72) on the upper surface side is extended in a direction spreading in a fan shape on the α direction side. The three power connection lines 71 (72) extended in a fan shape are bundled into one bundle.
Further, the lead wire 34 (35) on the lower surface side is extended in a fan-shaped direction on the γ direction side. The three lead wires 34 (35) extended in a fan shape are bundled into one bundle.

  The first sealed terminal 31 and the second sealed terminal 32 described above are arranged in parallel in a terminal box 37 provided in the upper lid portion 11a of the sealed case 11 of the hermetic compressor 1.

  FIG. 5A shows a top view of the upper lid portion 11a of the sealed case 11 of the compressor 1, and FIG. 5B shows a bottom view.

  As shown in FIG. 5A, on the upper surface of the upper lid portion 11a of the sealed case 11, a straight line passing through the center P of the discharge pipe 26 and the midpoint Q of the first and second sealed terminals 31 and 32 is defined as Y. .

  That is, in the top view, the first sealing terminal 31 is arranged on the right side with respect to the straight line Y, and the second sealing terminal 32 is arranged on the left side of the straight line Y, and FIG. 1, the first sealing terminal 31 is arranged on the left side with respect to the straight line Y, and the second sealing terminal 32 is arranged on the right side of the straight line Y.

Here, in the first sealing terminal 31, the α direction, which is the direction from the center point O toward the pin 52a, is substantially parallel to the straight line Y and away from the discharge pipe 26, and the second sealing terminal 32 is The γ direction, which is the direction from the center point O toward the pin 52c, is arranged so as to approach the straight line Y.
That is, the three pins 52a, 52b, 52c of the first sealed terminal 31 and the three pins 52a, 52b, 52c of the second sealed terminal 32 are connected to the center O of the discharge pipe 26 and the first and second pins. They are arranged asymmetrically with respect to a straight line Y passing through the midpoint Q of the sealed terminal.

  As shown in the bottom view (b) of FIG. 5, the three lead wires 34 connected to the first sealing terminal 31 are extended and bound in a direction away from the straight line Y. Of the three lead wires 35 connected to the second sealed terminal 32, the lead wire 35 connected to the pin 52b is connected in the extending direction away from the straight line Y, and the remaining two leads. It is bound to the outgoing line 35.

  An opening for drawing out the power connection lines 71 and 72 on the side opposite to the discharge pipe 26 is provided in the terminal box 37 having a wall surface that is provided on the top of the sealed case 11 and surrounds the first and second sealed terminals 31 and 32. 37a is provided.

On the upper surface side, among the three power connection lines 71 connected to the first sealed terminal 31, the power connection line 71 connected to the pin 52b is in a direction approaching the straight line Y, as shown in FIG. It is extended and has an extending direction toward the opening 37a.
The three power connection lines 72 connected to the second sealed terminal 32 all extend in a direction approaching the straight line Y, and the power connection lines 72 connected to the inner pins 52a and 52b are opened. It is an extending direction toward the portion 37a.

As described above, the lead wires 34, 35 are connected to the first and second sealed terminals 31, 32, so that the lead wires 34, 35 are not bent excessively, and the lead wires 34, 35 are discharged from the discharge pipe in the sealed case 11. 26 is connected to the winding La that is wound around the stator 12b of the electric motor 12 without contacting the motor 26.
Further, by connecting the power supply connection lines 71 and 72 to the first and second sealed terminals 31 and 32, the power supply connection lines 71 and 72 are not extremely curved, and are not bent from the opening 37a of the terminal box 37. It is drawn intensively. Thereby, it is not necessary to open the opening part 37a largely, and it can be set as the terminal box 37 which rain water and a foreign material do not enter easily.

By using the above-described configuration, even when two sealed terminals having the same shape are used, the power supply connection lines 71 and 72 and the lead wires 34 and 35 can be connected to the sealed terminal without the need to be extremely bent. The connection work at the time is facilitated, and a load such as bending stress is not applied to the lead wires 34 and 35.
In addition, by using a sealed terminal that extends in a fan-shaped connection line, even if the connection line is slightly curved, the connection line connected to the pin does not come into contact with the other pins, which is good It can be in a connected state.

  Here, the lead wires 34 and 35 are separate members from the winding La of the electric motor 12, but the winding La is used as the lead wire and the first sealing terminal 31 (second sealing terminal) is connected via the connection terminal 61. It may be connected to the terminal 32).

  By being connected as described above, the winding La of the motor 12 is connected to the inverter via the power connection lines 71 and 72, the first and second sealed terminals 31 and 32, and the lead wires 34 and 35. Power is supplied from the apparatus. Thereby, the roller 17 in the cylinder chamber 15 is eccentrically rotated through the rotor 12a and the rotating shaft 14. By this eccentric rotation, the refrigerant gas in the cylinder chamber 15 is compressed, and the compressed refrigerant gas is discharged from the discharge holes 24a and 24b.

  FIG. 6 shows the circuit configuration of the above-described electric motor 12, and the flow of current will be described below.

  The electric motor 12 is a DC brushless motor with a large supply power, and has a plurality of systems, for example, two systems of three-phase windings LaL1 and L2. The specifications of the two systems of three-phase windings LaL1, L2 are almost the same. The three-phase winding LaL1 includes a U-phase winding LaU1, a V-phase winding LaV1, and a W-phase winding LaW1 that are star-connected, and the three-phase winding LaL2 is a U-phase winding LaU2 and a V-phase that are star-connected. It consists of a winding LaV2 and a W-phase winding LaW2.

  The lead wire 34 is connected to the unconnected end of the phase windings LaU1, V1, and W1 of the three-phase winding LaL1, and is electrically connected to the first sealed terminal 31 via the connection terminal 61. . Further, the lead wire 35 is connected to the non-connection end of the phase windings LaU2, V2, and W2 of the winding LaL2, and is electrically connected to the second sealing terminal 32 via the connection terminal 61. And the output terminal of the inverter which is not shown in figure is connected to the power supply connection lines 71 and 72 connected to the upper surface side of the 1st and 2nd sealing terminals 31 and 32. FIG.

  The first and second lead wires 34 and 35 described above are connected to the rising portions 38 of the two windings La without crossing the straight line Y as shown in FIG. When the discharge pipe 26 is arranged at the center of the sealed case 11, the rising portion 38 from the winding La of the lead wires 34 and 35 is in a range of 60 ° from the center P of the discharge pipe 26 with respect to the straight line Y. Is preferred.

  Accordingly, the lead wires 34 and 35 have an appropriate length and are arranged without being extremely curved. Thereby, the connection operation which connects the lead wires 34 and 35 to the 1st sealing terminal 31 and the 2nd connection terminal 32 which were provided in the upper cover part 11a at the time of manufacture becomes easy. Further, it is possible to suppress the rubbing with the sealing case 11 when the upper lid portion 11a is joined to the main body portion 11b after the connection work and the pulling of the lead wires 34 and 35 when the upper lid portion 11a is rotated to some extent. This makes it easy to join the upper lid portion 11a and the main body portion 11b.

  Here, as shown in FIG. 8, the rising portion 38 of the lead wire 34 connected to the first connection terminal 31 may be provided at a position where the lead wire 34 crosses the straight line Y.

  In this case, the three lead wires 34 connected to the first connection terminal 31 are extended in a direction away from the straight line Y, so that even if the lead wire 34 crosses the straight line Y, the discharge pipe 26 There is no contact.

  By using the hermetic compressor having the connection configuration of the sealing terminal having the same shape as described above and each connection line, the type of the sealing terminal can be made singular and the manufacturing cost can be reduced. In addition, it is possible to provide a highly reliable hermetic compressor that has good workability during manufacture and does not place an excessive burden on the connection line.

  In the first embodiment, the directions of the connection lines connected to the first sealing terminal 31 and the second sealing terminal 32 are defined in the α, β, and γ directions. However, the β and γ directions may be interchanged. In this case, the connection configuration of the connection line of the hermetic compressor 1 described above is symmetric with respect to the straight line Y.

  In the first embodiment, the three lead wires 34 connected to the lower surface side of the first sealed terminal 31 are all connected so as to extend away from the straight line Y, but at least 2 The lead wire 34 may be provided so as to extend in a direction away from the straight line Y. For example, as shown in FIG. 9B, the lead wires 34a connected to the pins 52a and 52c, 34c may be provided so as to be away from the straight line Y.

  (Second Embodiment)

The above-described hermetic compressor 1 is used in a refrigeration cycle apparatus such as an air conditioner.
FIG. 10 shows a refrigeration cycle apparatus according to an embodiment of the present invention.

  A four-way valve 2, an outdoor heat exchanger 3, an expansion valve 4, and an indoor heat exchanger 5 are sequentially connected to the hermetic compressor 1 via a refrigerant pipe R to constitute a refrigeration cycle of an air conditioner. An outdoor fan 7 is provided in the vicinity of the outdoor heat exchanger 3, and an indoor fan 8 is provided in the vicinity of the indoor heat exchanger 5.

  The refrigerant discharged from the hermetic compressor 1 described above is supplied to the outdoor heat exchanger 3 through the four-way valve 2 and indicated by a solid arrow during cooling, and is blown by the rotation of the outdoor fan 7 here. It is condensed by exchanging heat with the outside air. This condensed refrigerant flows out of the outdoor heat exchanger 3 and flows to the indoor heat exchanger 5 through the expansion valve 4, where it exchanges heat with the indoor air blown by the rotation of the indoor fan 8. Evaporates and cools room air. The refrigerant that has flowed out of the indoor heat exchanger 5 is sucked into the hermetic compressor 1.

  Further, during heating, the refrigerant discharged from the compressor 1 is supplied to the indoor heat exchanger 5 through the four-way valve 2 as indicated by broken arrows, and here, the room is blown by the rotation of the indoor fan 8. Heat is exchanged with air to condense and heat indoor air. The condensed refrigerant flows out of the indoor heat exchanger 5 and flows to the outdoor heat exchanger 3 through the expansion valve 4. Here, the refrigerant is evaporated by exchanging heat with outdoor air blown by the rotation of the outdoor fan 7. To do. The evaporated refrigerant flows out of the outdoor heat exchanger 3 and is sucked into the hermetic compressor 1. Thereafter, the refrigerant is sequentially flown in the same manner, and the operation of the refrigeration cycle is continued.

  As described above, by incorporating the hermetic compressor 1 described in the first embodiment into a refrigeration cycle apparatus, it is possible to provide a refrigeration cycle apparatus with low manufacturing cost and high reliability.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

DESCRIPTION OF SYMBOLS 1 ... Sealed compressor, 2 ... Four-way valve, 11 ... Sealed case, 12 ... Electric motor, 13 ... Compression mechanism part, 26 ... Discharge pipe, 31 ... 1st sealed terminal, 32 ... 2nd sealed terminal, 34, 35 ... lead wire, 37 ... terminal box, 51 ... main body, 52a, 52b, 52c ... pin, 53 ... tab, 61 ... connection terminal, 61a ... terminal plate, 61b ... locking part, 61c ... crimping part, 62 ... Connection lines 71, 72 ... Power supply connection lines

Claims (6)

A sealed case with a discharge pipe on the top surface;
A compression mechanism that is disposed in the sealed case and compresses the refrigerant;
An electric motor disposed in the sealed case and driving the compression mechanism;
A first sealed terminal and a second sealed terminal which have three pins electrically connected to the electric motor, are configured in the same shape, and are arranged in parallel on the upper surface of the sealed case;
In a hermetic compressor with
The three pins of the first sealed terminal and the three pins of the second sealed terminal are asymmetric with respect to a straight line passing through the center of the discharge pipe and the midpoint of the first and second sealed terminals. A hermetic compressor characterized by being arranged in A lead wire connecting each of the pins of the first and second sealed terminals and the electric motor;
Of the lead wires connected to the three pins of the first sealed terminal, at least two lead wires are extended in a direction away from the straight line and connected to the pins,
At least one of the lead wires to which the three pins of the second sealed terminal are connected is extended in a direction away from the straight line and connected to the pins;
The hermetic compressor according to claim 1.   Three lead wires connected to three pins of at least one of the first and second sealed terminals are connected to the pins so as to extend in different directions, respectively. The hermetic compressor according to claim 2.   The three lead wires connected to the three pins of at least one of the first and second sealed terminals are extended in a fan-shaped direction. The hermetic compressor as described. A power connection line connected to three pins of the first and second sealed terminals for supplying power is provided, and the power connection line extends in a direction different from the extension direction of the lead line. The hermetic compressor according to any one of claims 2 to 4, wherein: A refrigeration cycle apparatus comprising the hermetic compressor according to any one of claims 1 to 5.

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