JP2014122565A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor which prevents frost formation in a power source terminal with a simple structure at low costs.SOLUTION: A compressor comprises: a first heat insulation material 70 which covers a fixture portion where a power source terminal 50 is fixed to a shell 10 from the outer side of the shell 10 and is disposed so as to face the fixture portion; a second heat insulation material 80 which is fitted into an area around the first heat insulation material 70 to be used, covers a part of an outer surface of the shell 10 which is located around the first heat insulation material 70, the second heat insulation material 80 having compression hardness smaller than the first heat insulation material 70 and being formed so as to be thicker than the first heat insulation material 70; and a terminal board 90 which is disposed contacting with the first heat insulation material 70 and the second heat insulation material 80. The first heat insulation material 70 and the second heat insulation material 80 are pressed to the outer surface side of the shell 10 by the terminal board 90 and are installed closely contacting with installation surfaces.

Description

  The present invention relates to a compressor.

  The hermetic compressor for compressing refrigerant, which is frequently used in refrigeration and air conditioners, houses a drive unit that drives the compression unit together with the compression unit in the hermetic shell. A power supply terminal is welded to the shell through its wall surface, and electrical input is made from outside the shell to the drive unit in the shell via the power supply terminal.

  This type of compressor is roughly classified into two types, a low-pressure shell and a high-pressure shell, depending on the atmospheric pressure in the housing space of the drive unit. For example, a compressor that sucks refrigerant into a shell from a suction pipe fixed to the shell and cools the drive unit with the suction refrigerant and then performs a compression operation. The drive unit is in a low pressure atmosphere (low pressure chamber). It is called a method. On the other hand, in order to cool the drive unit with the discharged refrigerant, the compressor that guides the compressed high-pressure discharged refrigerant to the housing space of the drive unit has a high-pressure shell system because the drive unit is in a high-pressure atmosphere (high-pressure chamber). be called.

  In both the low pressure shell method and the high pressure shell method, the inside of the shell is divided into a low pressure chamber and a high pressure chamber, and in the case of the low pressure shell method, the drive unit is disposed on the low pressure chamber side as described above. In a compressor used for a refrigerator, the temperature of the suction refrigerant is often extremely low in a normal use environment. For this reason, when the suction temperature of the refrigerant sucked into the compressor becomes lower than the dew point of the air around the compressor, the suction pipe through which the sucked refrigerant below the dew point temperature starts to be frosted. If the operation in such an inhalation state continues, the temperature of the entire shell surface also decreases, and frosting also proceeds to the power supply terminal in the low-pressure shell method. When frost forms on the power terminals in this way, there is a problem that the power connection terminals are short-circuited through the frosted moisture.

  When the operation of the compressor is stopped, frost formation on the power supply terminal is melted and moisture adheres to the power supply terminal, leading to a fault of electric leakage, and a necessary refrigeration capacity cannot be ensured.

  As means for avoiding the above problems, there is a technique of covering the entire compressor and a terminal box having a power supply terminal with a heat insulating material (see, for example, Patent Document 1).

  In addition, the branch pipe is branched from the discharge pipe that becomes high temperature of the compressor, and the branch pipe is led to the vicinity of the terminal box. The terminal box is warmed by using the high-temperature discharge gas inside the branch pipe as a heat source to prevent frost formation. There is a technique to prevent (see, for example, Patent Document 2).

JP 2009-299959 A (summary) JP 2001-27179 A (page 3, FIG. 1)

  In patent document 1, since it is the structure which covers the whole compressor and a terminal box with a heat insulating material, many heat insulating materials were needed and there existed a problem which became expensive.

  Further, in the method of leading a branch pipe branched from a high-temperature discharge pipe to the vicinity of the terminal box as in Patent Document 2, the handling of the branch pipe is restricted, and the piping design is restricted. Further, the branch pipe branched from the discharge pipe is shown elongated in FIG. 1 of Patent Document 2, and there is a possibility that the branch pipe itself resonates and breaks due to the vibration of the compressor. For this reason, there is a problem that measures against vibration are required, the structure is complicated, and the cost is increased.

  This invention is made | formed in view of such a point, and it aims at providing the compressor which can prevent frost formation of a power supply terminal by simple structure and low cost.

  The compressor according to the present invention accommodates a compression unit and a drive unit that drives the compression unit in the shell, and on the wall surface of the shell where the low pressure chamber is located, among the low pressure chamber and the high pressure chamber in the shell, A compressor in which a power supply terminal for supplying power from a power supply to the drive unit is disposed, and covers a fixed portion between the power supply terminal and the shell from the outside of the shell, and has a heat insulation side through hole. The first heat insulating material disposed opposite to the fixed portion by inserting the protruding portion protruding outward from the shell in the power terminal into the heat insulating side through hole, and used around the first heat insulating material, A second heat insulating material that covers the periphery of the first heat insulating material on the outer surface of the shell, has a compression hardness smaller than that of the first heat insulating material, and is thicker than that of the first heat insulating material, and a power supply terminal and a power source. To the first and second heat insulating materials. The first heat insulating material and the second heat insulating material are pressed against the outer surface side of the shell by the terminal block and are installed in close contact with the respective installation surfaces. .

  ADVANTAGE OF THE INVENTION According to this invention, the compressor which can prevent frost formation of a power supply terminal with a simple structure and low cost can be obtained.

It is a longitudinal cross-sectional view of the low pressure shell type compressor in Embodiment 1 of this invention. It is a figure which shows the principal part containing the power supply terminal of FIG. It is explanatory drawing of the body of FIG. It is a figure which shows the 1st heat insulating material of FIG. It is a figure which shows the 2nd heat insulating material of FIG. It is a figure which shows the state which connected the terminal block to the power supply terminal shown in FIG. It is a figure which shows the principal part of the compressor which concerns on Embodiment 3 of this invention. It is a figure which shows the heat insulating material of FIG. It is a figure which shows the state before mounting | wearing with a terminal block in FIG.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a low-pressure shell type compressor according to Embodiment 1 of the present invention. In FIG. 1 and the drawings to be described later, the same reference numerals denote the same or corresponding parts, which are common throughout the entire specification. Furthermore, the forms of the constituent elements appearing in the entire specification are merely examples and are not limited to these descriptions.

  The compressor 1 includes a compression unit 20 and a drive unit 30 in a shell 10, and both are connected by a crankshaft 40. The compression unit 20 includes a fixed scroll 21 and an orbiting scroll 22, and spiral teeth 21 a and 22 a are respectively provided on the opposing surfaces. The spiral teeth 21a and 22a are slidably engaged with each other to constitute a pair of compression chambers for compressing the refrigerant. Then, the compression unit 20 compresses the low-pressure refrigerant gas taken into the shell 10 from the suction pipe 11 using the rotation given from the drive unit 30 via the crankshaft 40, and sets the discharge port 12 as a high-pressure state. To the shell 10. The high-pressure refrigerant gas discharged into the shell 10 is discharged outside through the discharge pipe 13. In addition, although the compression part 20 of the scroll compressor is illustrated here, it is not restricted to this, It is good also as compression parts of other forms, such as a rotary compressor.

  The drive unit 30 includes a ring-shaped stator 31 and a rotor 32 supported so as to be able to rotate inside the stator 31. In the shell 10, the main frame 14 and the sub frame 15 are fixed to the shell 10 so as to face each other with the drive unit 30 interposed therebetween, and a main bearing 14 a and a sub bearing provided at the center of the main frame 14 and the sub frame 15. The crankshaft 40 is rotatably supported by 15a.

  In the shell 10, the upper side is separated into a high pressure chamber 16 and the lower side is separated into a low pressure chamber 17. The high pressure chamber 16 is filled with the discharge gas discharged from the compression unit 20 to form a high temperature and high pressure atmosphere, and the low pressure chamber 17 is filled with the suction gas sucked from the suction pipe 11 to form a low temperature and low pressure atmosphere. Yes.

  A wall surface of the shell 10 in the vicinity of the drive unit 30 (a wall surface of the shell 10 where the low pressure chamber 17 is located) 10a is provided with a power terminal connection hole 10b penetrating in the plate thickness direction. The power terminal 50 is fixed through the wall surface 10a. The drive unit 30 is supplied with power from the power supply outside the shell 10 by the power supply terminal 50. The portion of the power supply terminal 50 that protrudes from the shell 10 to the outside is covered by the terminal box 2 and the terminal box cover 3 that covers the opening of the terminal box 2 and is protected from external factors. The terminal box 2 is welded to the surface of the shell 10, and the terminal box cover 3 is fixed to the terminal box 2. In the terminal box 2, a bottom hole 2 a that contacts the wall surface 10 a of the shell 10 is formed with a through hole for providing a body 51 described later of the power terminal 50.

2A and 2B are diagrams showing a main part including the power supply terminal of FIG. 1, FIG. 2A is a longitudinal sectional view, and FIG. 2B is a view of FIG. 2A corresponds to the BB cross section of FIG. FIG. 3 is an explanatory diagram of the body of FIG. 2, for convenience, illustration of portions other than the wall surface 10 a of the shell 10 and the body 51 is omitted.
The power supply terminal 50 includes a metal body 51, three conductive pins 52 electrically connected to the power supply, a glass seal 53 as an insulating fixing portion, and the like. Each pin 52 corresponds to each phase of three-phase AC U, V, and W. The body 51 is fitted in a power supply terminal connection hole 10b that penetrates the wall surface 10a of the shell 10 and is projection welded. The body 51 is formed with three insertion holes for inserting the pins 52.

  A plate-like insulator 61 for securing electrical insulation is joined to the surface of the exposed portion 51a (the portion painted black in FIG. 3) exposed outside the shell 10 in the body 51. The plate-like insulator 61 is made of silicon rubber having electrical insulation, and has three insertion holes (not shown) for pin insertion.

  The pin 52 is passed through an insertion hole provided in each of the body 51 and the plate-like insulator 61, and is electrically conductive by the glass seal 53 with one end protruding into the shell 10 and the other end protruding out of the shell 10. Thus, it is insulated from the body 51 and fixed to the body 51. A cylindrical insulator 62 made of silicon rubber having electrical insulation is closely fitted on the outer periphery of the pin 52.

  A tab 54 is welded to a portion of the pin 52 that protrudes into the shell 10 and is electrically connected to the pin 52. The tab 54 is connected to each of the U, V, and W phases of the stator 31 of the drive unit 30. The input line 54a is connected. Further, a thin plate-like strap 55 is welded and electrically connected to the pin 52 at the tip end portion of the pin 52 protruding out of the shell 10, and an external power source (not shown) is connected to the strap 55. Wiring (not shown) from is connected. In this way, the inside and outside of the shell are connected using the power supply terminal 50, whereby the drive unit 30 is connected to the power supply outside the shell 10. Hereinafter, the power supply terminal 50 refers to the whole including the body 51, the pin 52, the glass seal 53, the tab 54, the strap 55, the plate-like insulator 61, and the cylindrical insulator 62.

  Since the power supply terminal 50 is welded to the wall surface 10a of the shell 10 at the body 51 portion as described above, when the low-temperature suction refrigerant flows into the shell 10 and the temperature of the wall surface 10a decreases, the power supply terminal 50 is accordingly accompanied. The temperature will also drop. For this reason, if the portion exposed to the outside of the shell in the power terminal 50 is not subjected to frosting countermeasures and remains in contact with the outside air, the portion exposed to the outside of the shell in the power terminal 50 becomes the compressor. It forms frost when it falls below the dew point temperature of the surrounding outside air. During operation, since current flows through the pin 52 and Joule heat is generated, the pin 52 itself does not cool and does not form frost. For this reason, it is the exposed portion 51 a of the body 51 that is a fixed portion between the power terminal 50 and the shell 10 that forms frost on the power terminal 50.

  Therefore, in this Embodiment 1, the 1st heat insulating material 70 and the 2nd heat insulating material 80 are provided in order to prevent the frost formation of the exposed part 51a of the body 51, and the wall surface 10a of the shell 10. FIG.

4 is a diagram showing the first heat insulating material of FIG. 2, FIG. 4 (a) is a front view of the first heat insulating material, and FIG. 4 (b) is an AA cross-sectional view of FIG. 4 (a).
The first heat insulating material 70 is formed in a disk shape that is large enough to cover the entire exposed portion 51 a of the body 51, and includes a through hole 71 for inserting the cylindrical insulator 62 and the strap 55, and a through hole 71. There are three notches 72 formed so as to penetrate therethrough. The 1st heat insulating material 70 prevents the frost formation of the exposed part 51a by covering the exposed part 51a of the body 51 of the power supply terminal 50. FIG. The through hole 71 and the notch 72 constitute the heat insulating side through hole of the present invention.

  In the first embodiment, it has been described that the pin 52 is installed on the shell 10 using the body 51, so that the frosting of the exposed portion 51a of the body 51 is prevented. What is necessary is just to prevent the frosting of the fixed part of 50 and the shell 10. Therefore, for example, in the case of a structure in which the pin 52 is directly fixed to the through hole provided in the shell 10 without providing the body 51 by the glass seal 53, the first heat insulating material 70 includes the power terminal 50 having the pin 52 and the shell 10. It is formed and arranged so as to cover the fixed part.

  The first heat insulating material 70 is formed by inserting the through hole 71 and the notch 72 through the strap 55, the pin 52, and the cylindrical insulator 62 of the power supply terminal 50 fixed to the shell 10 and pushing it into the shell outer surface side. 51 is disposed to face the exposed portion 51a. The through hole 71 of the first heat insulating material 70 is formed along the outer shape of the cylindrical insulator 62, and the first heat insulating material 70 is fitted around the cylindrical insulator 62.

The material of the first heat insulating material 70 is a foam material having water repellency, a heat transfer coefficient of 10 [W / m ² · K], and a heat conductivity of 0.02 to 0.05 [W / (m · k). )] Or other materials with high thermal insulation performance. The first heat insulating material 70 is made of a material that satisfies the flame retardancy grade V0 of the UL-94 standard, which is a flame retardance standard, and has high flame retardancy.

5A and 5B are diagrams showing the second heat insulating material of FIG. 2, FIG. 5A is a front view of the second heat insulating material, and FIG. 5B is a cross-sectional view taken along line AA of FIG.
The second heat insulating material 80 is configured in a plate shape having a through hole 81 having an inner diameter ΦD2 equivalent to the outer diameter ΦD1 of the first heat insulating material 70. Here, ΦD1 and ΦD2 are set to about 33.8 mm, for example. The second heat insulating material 80 is fitted into the outer periphery of the first heat insulating material 70 through the through hole 81 and covers the periphery of the first heat insulating material 70 on the outer surface of the shell 10 to insulate. In the second heat insulating material 80, an adhesive is applied to the surface on the shell 10 side, and is fixed to the bottom surface 2a of the terminal box 2 by the adhesive.

  The material of the second heat insulating material 80 is a foam material having water repellency, and is made of a foam material having a compression hardness smaller than that of the first heat insulating material 70. The compression hardness indicates a load necessary for compressing a heat insulating material having a certain thickness from the original thickness to, for example, 10% and 25%. The thickness t2 of the second heat insulating material 80 is set to be thicker than the thickness t1 of the first heat insulating material 70. The reason why the first heat insulating material 70 and the second heat insulating material 80 are configured in such a relationship will be described later. Further, the second heat insulating material 80 is required to have flame retardancy similarly to the first heat insulating material 70, and it is preferable to use the same grade V0 material as the first heat insulating material 70. In addition, although the heat conductivity of the 1st heat insulating material 70 and the 2nd heat insulating material 80 may be the same, since the 1st heat insulating material 70 is a part which covers an electrical part (pin 52), it is rather than the 2nd heat insulating material 80. It is preferable to use a material with low thermal conductivity and high heat insulation.

6 is a diagram showing a state in which a terminal block is connected to the power supply terminal shown in FIG. 2. FIG. 6 (a) is a longitudinal sectional view, and FIG. 6 (b) is a view of FIG. It is a figure. FIG. 6A corresponds to the BB cross section of FIG.
The terminal block 90 is for connecting the power terminal 50 and a cable (not shown) from the power source, and is generally T-shaped as shown in FIG. It is formed in a size that covers a part of each of the second heat insulating materials 80. The terminal block 90 is formed on the shell-side end surface 90 a, is formed to penetrate through the housing recess 91 that communicates with the housing recess 91 and accommodates a portion protruding from the first heat insulating material 70 of the cylindrical insulator 62. And a notch 92 for insertion. The receiving recess 91 and the notch 92 constitute the terminal block side through hole of the present invention.

  When the terminal block 90 is mounted, the power supply terminal 50 and the notch 92 are fixed to the shell 10 with the first heat insulating material 70 and the second heat insulating material 80 arranged around the power terminal 50. The terminal 50 is inserted through the strap 55, the pin 52, and the cylindrical insulator 62, and is pushed into the outer surface of the shell so as to be in contact with the first heat insulating material 70 and the second heat insulating material 80.

  Then, the strap 55 protruding outward from the terminal block 90 is bent in the direction of the dotted line arrow in FIG. 6A, and the screw 94 is screwed into the screw hole 93 provided in the terminal block 90, whereby the power supply terminal 50 and the power supply The U, V, and W phase cables (not shown) are electrically connected. After connecting the drive unit 30 and the power supply in this way, the dedicated terminal box cover 3 is fixed to the terminal box 2 to protect the entire power supply unit including the power supply terminal 50.

  In the state where the terminal block 90 is attached as described above, the first heat insulating material 70 is pressed against the body 51 side of the power supply terminal 50 by the terminal block 90 and is fixed in a state of being in close contact with the plate-like insulator 61. Therefore, the exposed portion 51a of the body 51 is covered with the first heat insulating material 70 having high heat insulating properties when viewed from the direction of arrow A in FIG.

  Since the plate insulator 61 is disposed between the exposed portion 51 a of the body 51 and the first heat insulating material 70, the gap S due to the plate thickness of the plate insulator 61 is the shell 10 of the plate insulator 61. It is formed on the side (left side in FIG. 6). When this gap S communicates with the outside air, the body 51 comes into contact with the outside air and forms frost. However, in the first embodiment, the gap S is not communicated with the outside air by the second heat insulating material 80. For this reason, the exposed part 51a of the body 51 is shielded from the outside air, and frosting of the power terminal 50 can be prevented.

  Further, since the terminal block 90 is screwed in a state of being pushed into the shell 10 side, the second heat insulating material 80 is also pressed by the terminal block 90. Since the second heat insulating material 80 is formed to be thicker than the first heat insulating material 70, the thickness of the portion pressed by the terminal block 90 is reduced and is in close contact with the bottom surface 2 a of the terminal block 90. Thus, the 2nd heat insulating material 80 contact | adheres to the bottom face 2a of the terminal block 90, the exposed part 51a of the body 51 is interrupted | blocked with external air, and the wall surface 10a of the shell 10 can be thermally insulated.

  Next, specifications required for the first heat insulating material 70 will be described. Since the exposed portion 73 (solid-coated portion in FIG. 6B) that is not covered by the terminal block 90 in the first heat insulating material 70 is in contact with the outside air, when the exposed portion 73 becomes less than 0 ° C. due to the cold heat in the shell 10, The surface of the exposed portion 73 is frosted. For this reason, the thickness of the 1st heat insulating material 70 is set so that this exposed part 73 may not form frost.

In the compressor 1 used in the refrigeration apparatus, a minimum intake temperature of the compressor 1 is assumed to be −45 ° C. in consideration of the use range of the evaporation temperature. Consider a case in which the shell surface temperature decreases to −45 ° C. and the temperature of the contact surface between the plate insulator 61 and the first heat insulating material 70 disposed on the body surface also decreases to −45 ° C. When the ambient temperature of the compressor is 30 ° C., in order to secure the surface temperature of the exposed portion 73 of the first heat insulating material 70 at 0 ° C. or higher, the heat transfer coefficient between the outside air and the first heat insulating material 70 is 10 [ W / m ² · K] and the thermal conductivity of the first heat insulating material 70 is 0.02 to 0.05 [W / (m · k)], the thickness of the first heat insulating material 70 (first heat insulating material) The thickness in the direction perpendicular to the installation surface 70 is required to be 3 to 7.5 mm.

  The operation and action of the first embodiment will be described. Here, first, a conventional process of frost formation will be described. When refrigerant having a temperature lower than the dew point temperature of the ambient air of the compressor is sucked into the compressor 1, frosting starts from the surface of the suction pipe 11, and frost develops on the surface of the shell 10 that is in contact with the outside air. . Since the cooling action of the shell 10 is higher for liquid than for gas, when liquid refrigerant having a dew point or lower is sucked into the compressor 1, frost formation is accelerated.

  Here, if the first heat insulating material 70 and the second heat insulating material 80 are not provided, the frost that has developed on the surface of the shell 10 also develops in the exposed portion 51 a of the body 51 that is cooled in the same manner as the shell 10. become.

  However, in this Embodiment 1, while covering the whole exposed part 51a of the body 51 using the 1st heat insulating material 70 and the 2nd heat insulating material 80, the 1st heat insulating material 70 and the 2nd heat insulating material 80 are each installation surface. Since the exposed portion 51a of the body 51 is blocked from contact with the outside air, frosting of the exposed portion 51a of the body 51 and the wall surface 10a of the shell 10 can be prevented.

  As described above, according to the first embodiment, the entire exposed portion 51a of the body 51 is covered with the first heat insulating material 70, and its periphery is covered with the second heat insulating material 80. Since the two heat insulating materials 80 are installed in close contact with the respective installation surfaces, the entire exposed portion 51a of the body 51 can be blocked from contact with the outside air. For this reason, the frost formation of the exposed part 51a of the body 51, that is, the frost formation of the power supply terminal 50 can be prevented. Therefore, the reliability of the compressor 1 in the refrigeration / air conditioning apparatus can be improved.

  In FIG. 2, since the bottom surface 2 a of the terminal box 2 is interposed between the shell 10 and the second heat insulating material 80, the second heat insulating material 80 is in close contact with the bottom surface 2 a of the terminal box 2. However, the present invention includes a configuration in which the bottom surface 2a of the terminal box 2 is not interposed between the shell 10 and the second heat insulating material 80. In this case, the second heat insulating material 80 is in close contact with the outer surface of the shell 10. become. That is, the second heat insulating material 80 may be installed so as to be in close contact with the outer surface of the shell 10 directly or indirectly.

  Moreover, since the frosting of the power supply terminal 50 can be prevented, it is possible to prevent leakage, and it is possible to prevent inconveniences such as inability to operate the compressor 1 due to leakage and the inability to obtain a necessary refrigeration capacity. As a result, the compressor 1 can be stably operated continuously, and a predetermined refrigeration capacity can be continuously obtained.

  Moreover, since this Embodiment 1 is the structure which covers the body 51 part which is a fixing part of the power terminal 50 and the shell 10 with the 1st heat insulating material 70 and the 2nd heat insulating material 80, the conventional terminal box 2 whole is comprised. Compared to the covering structure, the amount of the heat insulating material is small, and it can be configured at a low cost. Moreover, since it is a frosting prevention structure using two heat insulating materials, the configuration is simple.

  Moreover, the 1st heat insulating material 70 and the 2nd heat insulating material 80 are comprised with a foam material, and the heat conductivity is 0.02-0.05 [W / (m * k)] as the 1st heat insulating material 70. Since it was made to use, the foaming heat insulating material generally marketed can be used. For this reason, compared with the case where it newly develops as a heat insulating material only for the compressor 1, it can comprise at low cost. If the thermal conductivity is higher than 0.05 and the heat insulation performance is low, it is necessary to further increase the thickness of the first heat insulating material 70 in order to prevent the exposed portion 73 (FIG. 6B) from forming frost. May occur, and the installation work efficiency of the first heat insulating material 70 may decrease. For this reason, also from the viewpoint of work efficiency, it is preferable that the thermal conductivity of the first heat insulating material 70 is 0.02 to 0.05 [W / (m · k)].

  When the first heat insulating material 70 is replaced during maintenance of the compressor 1 or the like, the screws 94 of the strap 55, the U, V, and W input wires 54a of the terminal block 90, and the terminal block 90 are temporarily removed. There is a need. In the first embodiment, even if such maintenance is required, the first heat insulating material 70 can be easily removed by removing the screw 94 of the strap 55 and removing the terminal block 90. For this reason, providing the first heat insulating material 70 and the second heat insulating material 80 can ensure the maintainability of the compressor similar to the conventional one without deteriorating the maintainability.

  In the first embodiment, the terminal block 90 is configured to cover the first heat insulating material 70 while leaving a part (exposed portion 73) of the first heat insulating material 70, but covers the entire first heat insulating material 70. It is good also as a structure.

Embodiment 2. FIG.
The second embodiment relates to the water repellency of the first heat insulating material 70 and the second heat insulating material 80. The configuration of the compressor 1 according to the second embodiment is the same as that of the first embodiment shown in FIGS.

  Although both the first heat insulating material 70 and the second heat insulating material 80 have water repellency, the second heat insulating material 80 is disposed outside the first heat insulating material 70, and the electric part like the first heat insulating material 70. It does not cover (pin 52). For this reason, even if the 2nd heat insulating material 80 absorbs a little water | moisture content, there is no problem and the water repellency higher than the 1st heat insulating material 70 is not calculated | required.

  For this reason, in the second embodiment, the second heat insulating material 80 has a lower water repellency than the first heat insulating material 70.

  With this configuration, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained. That is, by making the second heat insulating material 80 side away from the pin 52 water repellent lower than the first heat insulating material 70, moisture is absorbed on the second heat insulating material 80 side, and the exposed portion of the body 51 is exposed. Prevents moisture from entering 51a. Thereby, compared with Embodiment 1, the anti-frosting effect can be further enhanced.

Embodiment 3 FIG.
The third embodiment further simplifies the configuration as compared with the first and second embodiments. In the following, the third embodiment will be described focusing on the differences from the first embodiment.

7A and 7B are diagrams showing the main part of the compressor according to Embodiment 3 of the present invention. FIG. 7A is a longitudinal sectional view, and FIG. 7B is a view of FIG. It is a figure. 7A corresponds to the BB cross section of FIG. 7B. 8A and 8B are diagrams showing the third heat insulating material of FIG. 7, in which FIG. 8A is a front view of the heat insulating material, and FIG.
The difference between the third embodiment and the first embodiment is that a single heat insulating material 100 is provided instead of the first heat insulating material 70 and the second heat insulating material 80 of the first embodiment. Other configurations are the same as those in the first embodiment.

  The heat insulating material 100 is formed larger than the outer shape of the exposed portion 51a of the body 51 so as to cover the entire exposed portion 51a of the body 51. Further, the heat insulating material 100 is provided with a through hole 101 through which the cylindrical insulator 62 can be inserted, and a notch 102 through which the strap 55 is inserted, like the first heat insulating material 70. Further, in the heat insulating material 100, a concave portion 103 that accommodates the exposed portion 51 a of the body 51 and the plate-like insulator 61 is formed on the surface on the shell 10 side. The through hole 101 and the notch 102 constitute the heat insulating side through hole of the present invention.

As with the first heat insulating material 70 of the first embodiment, the heat insulating material 100 has a heat transfer coefficient of 10 [W / m ² · K] and a heat conductivity of 0.02 to 0.05 [W / (m · k). ] Is used. Also, the thickness is set to 3 to 7.5 mm as in the first heat insulating material 70 of the first embodiment.

  When installing the heat insulating material 100 configured as described above, the through hole 101 and the notch 102 of the heat insulating material 100 are replaced with the strap 55, the pin 52, and the cylindrical insulator 62 of the power supply terminal 50 fixed to the shell 10. To be inserted. And the heat insulating material 100 is pushed in to the body 51 side, and it fits in the power supply terminal 50 so that the whole body 51 may be covered. The state is shown in FIG.

  After fitting the heat insulating material 100 to the power terminal 50, the terminal block 90 is placed on the surface of the heat insulating material 100, and the strap 55 is screwed to the terminal block 90 in the same manner as described above. The heat insulating material 100 is pressed against the shell outer surface side by the shell side end surface 90a of the terminal block 90, and is installed in a state of being in intimate contact with the exposed portion 51a of the body 51 and the outer surface of the surrounding shell 10.

  In FIG. 9, since the bottom surface 2 a of the terminal box 2 is interposed between the shell 10 and the heat insulating material 100, the heat insulating material 100 is in close contact with the bottom surface 2 a of the terminal box 2. However, the present invention includes a configuration in which the bottom surface 2a of the terminal box 2 is not interposed between the shell 10 and the heat insulating material 100. In this case, the heat insulating material 100 is in direct contact with the outer surface of the shell 10. Become. That is, the heat insulating material 100 may be installed so as to directly or indirectly adhere to the outer surface of the shell 10 while covering the entire exposed portion 51 a of the body 51.

  The operation of the third embodiment is the same as that of the first embodiment. That is, since the heat insulating material 100 is tightly fixed to the terminal box 2 in a state where the entire exposed portion 51a of the body 51 of the power supply terminal 50 is covered with the heat insulating material 100, the exposed portion 51a of the body 51 is protected from contact with the outside air. It can block | block and can prevent the frost formation of the exposed part 51a of the body 51, ie, the frost formation of the power supply terminal 50. FIG.

  As described above, according to the third embodiment, the same effect as in the first embodiment can be obtained with a simple structure as compared with the first embodiment.

  1 compressor, 2 terminal box, 2a bottom surface, 3 terminal box cover, 10 shell, 10a wall surface, 10b power supply terminal connection hole, 11 suction pipe, 12 discharge port, 13 discharge pipe, 14 main frame, 14a main bearing, 15 sub Frame, 15a Secondary bearing, 16 High pressure chamber, 17 Low pressure chamber, 20 Compression section, 21 Fixed scroll, 22 Swing scroll, 21a Spiral tooth, 22a Spiral tooth, 30 Drive section, 31 Stator, 32 Rotor, 40 Crankshaft, 50 Power supply terminal, 51 body, 51a exposed portion, 52 pins, 53 glass seal, 54 tab, 54a input line, 55 strap, 61 plate insulator, 62 cylindrical insulator, 70 first heat insulator, 71 through hole, 72 Notch, 73 exposed part, 80 second heat insulating material, 81 through hole, 90 terminal block, 90a shell side end , 91 accommodating recess, 92 notches, 93 screw hole, 94 screws, 100 insulation, 101 through hole 102 notch, 103 recess.

Claims (13)

A compression unit and a drive unit for driving the compression unit are accommodated in the shell, and the wall of the shell where the low pressure chamber is located, among the low pressure chamber and the high pressure chamber in the shell, A compressor in which a power supply terminal for supplying power from a power supply is disposed,
The fixed portion between the power terminal and the shell is covered from the outside of the shell, has a heat insulating side through hole, and the protruding portion protruding outward from the shell in the power terminal is the heat insulating side through hole. A first heat insulating material that is inserted through and disposed to face the fixed portion;
It is used by being fitted around the first heat insulating material, covers the periphery of the first heat insulating material on the outer surface of the shell, has a compression hardness smaller than that of the first heat insulating material, and is smaller than that of the first heat insulating material. A second heat insulating material formed thick,
The power supply terminal and a cable from the power supply are connected, comprising a terminal block arranged in contact with the first heat insulating material and the second heat insulating material,
The first heat insulating material and the second heat insulating material are:
The compressor, wherein the compressor is pressed against the outer surface side of the shell by the terminal block and is installed in close contact with each installation surface. The first heat insulating material and the second heat insulating material are made of a foam material,
As the first heat insulating material,
2. The compressor according to claim 1, wherein a foam material having a thermal conductivity of 0.02 to 0.05 W / (m · k) is used. The thermal conductivity of the first heat insulating material is
The compressor according to claim 1 or 2, wherein the compressor has a thermal conductivity smaller than that of the second heat insulating material. The first heat insulating material is
The compressor according to any one of claims 1 to 3, wherein a thickness in a direction orthogonal to an installation surface of the first heat insulating material is 3 to 7.5 mm. The second heat insulating material is
The compressor according to any one of claims 1 to 4, wherein the water repellency is lower than that of the first heat insulating material. The power terminal is
A body welded to a power supply terminal connection hole provided on the wall surface of the shell;
One end side protrudes into the inside of the shell, the other end side protrudes outside the shell, is insulated and fixed to the through hole of the body, and is a conductive pin connected to the power source,
An insulation fixing portion for insulatingly fixing the through hole and the pin of the body;
The first heat insulating material is
The compressor according to any one of claims 1 to 5, wherein the compressor is configured to cover an entire exposed portion exposed to the outside of the shell in the body. A plate-like insulator is disposed between the exposed portion of the body and the first heat insulating material,
The compressor according to claim 6, wherein a gap formed on the shell side by a plate thickness of the plate-like insulator is blocked from outside air by the second heat insulating material. A thin plate-like strap electrically conductively connected to the pin is provided at the tip of the pin protruding to the outside of the shell,
The terminal block is
The compressor according to claim 6 or 7, wherein the strap is screwed to the terminal block and connected to the power supply terminal. A compression unit and a drive unit for driving the compression unit are accommodated in the shell, and the wall of the shell where the low pressure chamber is located, among the low pressure chamber and the high pressure chamber in the shell, A compressor in which a power supply terminal for supplying power is disposed through the compressor,
The fixed portion between the power terminal and the shell is covered from the outside of the shell, has a heat insulating side through hole, and the protruding portion protruding outward from the shell in the power terminal is the heat insulating side through hole. A heat insulating material made of a foam material having a thermal conductivity of 0.02 to 0.05 W / (m · k), disposed opposite to the outer surface of the shell,
For connecting the power supply terminal and the input line, comprising a terminal block arranged in contact with the heat insulating material,
The heat insulating material is
The compressor is pressed against the outer surface side of the shell by the terminal block and is installed in close contact with its installation surface. The heat insulating material is
The compressor according to claim 9, wherein a thickness in a direction perpendicular to the installation surface of the heat insulating material is 3 to 7.5 mm. The power terminal is
A body welded to a power supply terminal connection hole provided on the wall surface of the shell;
One end side protrudes into the inside of the shell, the other end side protrudes outside the shell, is insulated and fixed to the through hole of the body, and is a conductive pin connected to the power source,
An insulation fixing portion for insulatingly fixing the through hole and the pin of the body;
The heat insulating material is
11. The compressor according to claim 9, wherein the compressor is configured to cover an entire exposed portion exposed to the outside of the shell in the body. A plate-like insulator is disposed between the exposed portion of the body and the heat insulating material,
The compressor according to claim 11, wherein a gap formed on the shell side of the plate insulator by the plate thickness of the plate insulator is blocked from outside air by the heat insulating material. A thin plate-like strap electrically conductively connected to the pin is provided at the tip of the pin protruding to the outside of the shell,
The terminal block is
The compressor according to claim 11 or 12, wherein the strap is screwed to the terminal block and connected to the power supply terminal.

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