Hermetic terminal and compressor

Abstract

An airtight terminal according to the present disclosure comprises: a plurality of conduction pins; a disc-shaped or cylindrical insulating member that comprises, in a thickness direction, a plurality of through-holes for individually inserting the conduction pins; an annular member that surrounds the insulating member; and a plurality of brazing portions that respectively secure the conduction pins on either one principal surface side of the insulating member. The principal surface having the brazing portions of the insulating member comprises a groove that demarcates each of the brazing portions. The shape of the groove is a U-shape, V-shape, or isosceles trapezoid shape. A compressor according to the present disclosure comprises a casing that houses a motor for compressing a refrigerant, and the abovementioned airtight terminal that is mounted to the casing.

Description

Technical Field

[0001] The present disclosure relates to an airtight terminal and a compressor.

Background Art

[0002] An airtight terminal used in a refrigerant compressor (compressor) such as a refrigerator or an air conditioner is required to have high pressure resistance and high voltage resistance because the compressor is disposed in a pressure-resistant container filled with a refrigerant.

[0003] For example, in Patent Document 1, a metal outer ring including a circular top plate portion, a cylindrical portion extending downward from the outer peripheral end of the top plate portion, a flange portion extending from the lower end of the cylindrical portion, and a small cylindrical portion extending inward from the top plate portion and having a lead sealing hole formed therein; a lead sealed in the lead sealing hole of the metal outer ring via a sealing glass; and an insulating sleeve welded to the sealing glass on the inner surface side of the metal outer ring. An airtight terminal for a compressor has been proposed in which the insulating sleeve is welded so as to extend parallel to the top plate portion and beyond the small cylindrical portion on the inner surface side of the metal outer ring.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] The airtight terminal according to the present disclosure includes a plurality of conductive pins, a disk-shaped or columnar insulating member having a plurality of through holes for individually inserting the conductive pins in a thickness direction, an annular member surrounding the insulating member, and a plurality of brazing portions for fixing the conductive pins to one of the main surfaces of the insulating member, respectively. The main surface of the insulating member on the side having the brazing portions is provided with grooves partitioning the brazing portions, respectively. The shape of the groove is a U-shape, a V-shape, or an isosceles trapezoid shape.

[0006] The compressor according to the present disclosure includes a casing that houses a motor for compressing a refrigerant, and the above-mentioned hermetic terminal attached to the casing. Electric power from an external power source is supplied to the motor via a conduction pin.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7A

Figure 7B

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0008] In the hermetic terminal for a compressor described in Patent Document 1, since a part of the metal outer ring contacts the inner peripheral side of the lead sealing hole, it is not possible to sufficiently secure the creepage distance between adjacent leads, and there is a problem that insulation breakdown is likely to occur.

[0009] The present disclosure provides an airtight terminal and a compressor in which dielectric breakdown is less likely to occur.

[0010] The airtight terminal and the compressor according to the present disclosure are less likely to cause dielectric breakdown.

[0011] <Airtight terminal> Hereinafter, the airtight terminal of the non-limiting embodiment of the present disclosure will be described in detail with reference to the drawings. However, in each of the drawings referred to below, for convenience of explanation, only the main members necessary for explaining the embodiment are shown in a simplified manner. Therefore, the airtight terminal may include any constituent member not shown in each of the drawings referred to. Also, the dimensions of the members in each drawing do not faithfully represent the dimensions of the actual constituent members and the dimensional ratios of the respective members.

[0012] As shown in an example in FIGS. 1 to 3, the airtight terminal 1 includes a conductive pin 2, an insulating member 3, an annular member 4, and a brazing portion 5. This airtight terminal 1 can be used, for example, in a compressor or the like. Hereinafter, taking the case where the airtight terminal 1 is for a compressor as an example, each component of the airtight terminal 1 will be described in order.

[0013] The conductive pin 2 has conductivity and can function as a conductive path for inputting and outputting an electrical signal between the inside and outside of a pressure-resistant container to which the airtight terminal 1 is attached. Examples of the material of the conductive pin 2 include metals having good conductivity such as copper such as oxygen-free copper, tough pitch copper, phosphor-deoxidized copper, titanium, nickel, austenitic stainless steel (for example, SUS304), Cu-Ni alloy (for example, cupronickel), Fe-Co alloy, Fe-Co-C alloy, Fe-Ni alloy, and Fe-Ni-Co alloy. The shape of the conductive pin 2 may be a cylindrical shape or a polygonal columnar shape. There are a plurality of conductive pins 2. The number of conductive pins 2 may be 2 or more and 50 or less.

[0014] The insulating member 3 has insulating properties and can hold the conductive pin 2 while electrically insulating it. Examples of the material of the insulating member 3 include electrical insulating materials such as aluminum oxide sintered bodies.

[0015] The insulating member 3 is disc-shaped or columnar. An example of the insulating member 3 shown in FIG. 3 is columnar. More specifically, an example of the insulating member 3 shown in FIG. 3 is columnar and extends along the axis S. The axis S passes through the centers of the two main surfaces 32 and 33 of the insulating member 3.

[0016] The insulating member 3 is not limited to a specific size. For example, the outer diameter D of the insulating member 3 may be set to about 20 mm or more and 30 mm or less. Also, the length L of the insulating member 3 in the direction of the axis S may be set to about 14.5 mm or more and 24.5 mm or less.

[0017] The insulating member 3 is provided with a plurality of through holes 31 for individually inserting the conductive pins 2 in the thickness direction. The thickness direction may mean the direction of the axis S. The through holes 31 may penetrate the insulating member 3 in the thickness direction.

[0018] The number of the through holes 31 may be the same as the number of the conductive pins 2. The plurality of through holes 31 may be equally spaced along the circumferential direction of the insulating member 3. For example, when there are three through holes 31, the three through holes 31 may be positioned so as to be rotationally symmetric about the axis S of the insulating member 3 by 120°.

[0019] The conductive pins 2 are inserted into the through holes 31 with both ends protruding. When a device located inside the pressure-resistant container and a device located outside the pressure-resistant container are electrically connected to both ends of the conductive pins 2 protruding from the through holes 31 respectively, the airtight terminal 1 can function as a terminal for transmitting an electrical signal between the devices inside and outside the pressure-resistant container.

[0020] The annular member 4 can function as an attachment site for attaching the airtight terminal 1 to the pressure-resistant container. Therefore, the airtight terminal 1 may be attached to the pressure-resistant container via the annular member 4.

[0021] The annular member 4 surrounds the insulating member 3. More specifically, the annular member 4 surrounds at least a part of the insulating member 3. The term "annular" in the annular member 4 is not limited to only an annular shape, but is a concept that includes an annular or cylindrical shape as long as it can surround the insulating member 3. Therefore, the shape of the annular member 4 is not limited to only an annular shape, and may be annular or cylindrical. For example, as shown in an example in FIG. 3, the shape of the annular member 4 may be cylindrical. Also, the outer diameter of the annular member 4 may be constant.

[0022] Examples of the material of the annular member 4 may include metals. Examples of the metals may include carbon steels for mechanical structures such as S25C, hot-rolled steels for general structures such as SS400 (cold-rolled steels), Fe-Ni-Co alloys, and the like.

[0023] The brazing portion 5 is a portion for fixing the plurality of conduction pins 2 to one of the main surfaces of the insulating member 3, respectively. The brazing portion 5 may, for example, fix the plurality of conduction pins 2 to the main surface 32 or the convex surface 341 (top surface) of the convex portion 34 provided on the main surface 32, respectively. Examples of the brazing material may include silver brazing (for example, Bag-8, Bag-9).

[0024] There are a plurality of brazing portions 5. The number of the brazing portions 5 may be the same as the number of the conduction pins 2. The plurality of brazing portions 5 are located apart from each other.

[0025] As shown in an example in FIG. 2, when the number of the brazing portions 5 is three, the three brazing portions 5 may be conveniently referred to as a first brazing portion 51, a second brazing portion 52, and a third brazing portion 53. These points are the same for the conduction pins 2 and the through holes 31.

[0026] Here, the main surface 32 on the side provided with the brazing portion 5 is provided with grooves 321 that partition the brazing portions 5 respectively. As shown in an example in FIGS. 4 to 6, the groove 321 is a U-shaped groove (hereinafter, the U-shaped groove is referred to as a U-groove) 322, a V-shaped groove (hereinafter, the V-shaped groove is referred to as a V-groove) 323, or a trapezoidal groove (hereinafter, the trapezoidal groove is referred to as a trapezoidal groove) 324. Since the main surface 32 on the side provided with the brazing portion 5 is provided with the grooves 321 that partition the brazing portions 5 respectively, the creepage distance between adjacent conductive pins 2 becomes longer, so that the risk of dielectric breakdown can be suppressed. Further, when the groove 321 is a U-groove 322, a V-groove 323, or a trapezoidal groove 324, when the insulating member 3 is formed by uniaxial press forming, cold isostatic pressing (CIP) forming, etc., the demolding becomes easier than when the groove 321 is rectangular, so that microcracks are less likely to occur around the bottom surface 321a of the groove 321. Therefore, even if the temperature drop and temperature rise are repeated, the hermetic terminal 1 can be used over a long period of time.

[0027] Note that FIGS. 4 to 6 are cross-sectional views orthogonal to the extending direction of the groove 321 (in FIG. 2, the direction from the axis S of the insulating member 3 toward the outer periphery, the same hereinafter). As shown in an example in FIG. 4, the U-groove 322 may mean a groove formed in a U-shape in a cross-section orthogonal to the extending direction of the groove 321. As shown in an example in FIG. 5, the V-groove 323 may mean a groove formed in a V-shape in a cross-section orthogonal to the extending direction of the groove 321. As shown in an example in FIG. 6, the trapezoidal groove 324 may have an opening width larger than the width of the bottom surface 321a in a cross-section orthogonal to the extending direction of the groove 321. Note that the U-groove 322 does not necessarily have a strictly U-shaped shape, and may include some curvature as long as the effect is obtained. This also applies to the V-groove 323 and the trapezoidal groove 324.

[0028] The groove 321 is not limited to a specific size. For example, the opening width of the groove 321 in a direction orthogonal to the extending direction of the groove 321 may be set to about 0.5 mm or more and 2 mm or less. Also, the depth of the groove 321 may be set to about 0.5 mm or more and 2 mm or less.

[0029] As shown in FIG. 7A, the groove 321 may have a trapezoidal shape with the bottom surface 321a of the groove 321 being convexly curved in the depth direction of the groove 321 from the main surface 32 side of the side having the brazing portion 5 toward the bottom surface 321a side.

[0030] When the bottom surface 321a is convexly curved as described above, the creepage distance between adjacent conductive pins 2 becomes longer than in the case of a trapezoid in which the bottom surface 321a is flat, so the effect of suppressing the risk of dielectric breakdown is further enhanced.

[0031] In this case, the radius of curvature of the bottom surface 321a is preferably 300 μm or more and 350 μm or less. When the radius of curvature of the bottom surface 321a is 300 μm or more, the curvature of the bottom surface 321a becomes small, and the generation of cracks starting from the bottom surface 321a can be suppressed. When the radius of curvature of the bottom surface 321a is 350 μm or less, the groove 321 becomes deeper, and the effect of suppressing the risk of dielectric breakdown is further enhanced.

[0032] FIG. 7B is a diagram showing an example of the profile of the groove shown in FIG. 7A, and the curvature of the bottom surface 321a is 319 μm. The profile of the groove 321 can be measured using a shape analysis laser microscope (such as "VK-X1100" manufactured by KEYENCE CORPORATION or its successor models). Here, examples of the profile of the groove 321 include the width of the opening of the groove 321, the depth of the groove 321, the radius of curvature of the bottom surface 321a of the groove 321, and the shortest length along the surface of the groove 321. As the measurement conditions, the illumination method is coaxial epi-illumination, the magnification is 120 times, and the range including the groove 321 is set to, for example, 2781 μm (longitudinal direction of the groove 321) × 2090 μm per location, and three locations are selected. Then, a line perpendicular to the longitudinal direction of the groove 321 is drawn, and profile measurement may be performed with this line as the measurement target.

[0033] The bottom surface 321a of the groove 321 may have an average value of the cutting level difference (Rδc) representing the difference between the cutting level at a 25% load length ratio and the cutting level at a 75% load length ratio in the roughness curve, which may be 1 μm or more and 2.2 μm or less, or may be 1.3 μm or more and 2.2 μm or less.

[0034] When the average value of the cutting level difference (Rδc) of the bottom surface 321a of the groove 321 is equal to or greater than the above-mentioned lower limit value, the contact angle with respect to pure water becomes smaller. Therefore, when cleaning the dirt adhering to the bottom surface 321a with pure water, the dirt can be easily removed. Also, when the average value of the cutting level difference (Rδc) of the bottom surface 321a of the groove 321 is equal to or less than the above-mentioned upper limit value, the surface properties become good, so large-scale degranulation is less likely to occur, and even if such degranulation occurs, it is less likely to float or scatter and have an adverse effect. The bottom surface 321a of the groove 321 is, for example, a ground surface or a fired surface.

[0035] The ratio R2 / R1 of the average value R2 of the average length (RSm) to the average value R1 of the arithmetic mean roughness (Ra) in the roughness curve of the bottom surface 321a of the groove 321 may be 5 or more.

[0036] The average length (RSm) represents the average period of the unevenness of the surface to be measured. As the ratio R2 / R1 increases, the average period of the unevenness of the surface to be measured becomes longer, and the average depth of the concave portions of the unevenness becomes shallower. When the ratio R2 / R1 is 5 or more, even if the temperature rise and fall are repeated, since there are few deep concave portions on the bottom surface 321a, the generation of microcracks can be suppressed.

[0037] The ratio R2 / R1 may be 30 or less.

[0038] The main surface 32 on the side provided with the brazed portion 5 may have an average value of the cutting level difference (Rδc) of 1 μm or more and 2.2 μm or less, or may be 1 μm or more and 1.9 μm or less.

[0039] When the average value of the cutting level difference (Rδc) of the main surface 32 on the side provided with the brazing portion 5 is equal to or greater than the above-described lower limit value, the contact angle with pure water becomes small. Therefore, when cleaning the dirt adhering to the main surface 32 with pure water, the dirt can be easily removed. Further, when the average value of the cutting level difference (Rδc) of the main surface 32 is equal to or less than the above-described upper limit value, the surface properties are improved, so that large threshing is less likely to occur. Even if such threshing occurs, it is less likely to float or scatter and have an adverse effect. The main surface 32 is, for example, a fired surface.

[0040] The cutting level difference (Rδc), the arithmetic mean roughness (Ra), and the mean length (RSm) may be measured, for example, in accordance with JIS B 0601:2001. Four lines to be measured may be drawn at substantially equal intervals in each of the following three measurement ranges, and the line roughness may be measured, and the average value of 12 measured values may be calculated respectively. The measurement conditions may be set as follows, for example. Measuring instrument: Shape analysis laser microscope (Keyence Corporation's "VK-X1100" or its successor model) Illumination: Coaxial epi-illumination Cutoff value λs: None Cutoff value λc: 0.08 mm Cutoff value λf: None Correction for end effect: Yes Magnification: 240 times (10×24) Measurement locations: Three locations each on the bottom surface 321a of the groove 321 and the main surface 32 Measurement range: 1428 μm × 1071 μm / one location Length of line to be measured: 1280 μm / one line

[0041] The groove 321 may be provided radially from the axis S of the insulating member 3 toward the outer periphery. In this case, dirt is easily discharged from the axis S toward the outer periphery during cleaning. Note that the groove 321 may reach the outer periphery of the insulating member 3.

[0042] The groove 321 may be provided in a honeycomb shape. In an example of the hermetic terminal 1' shown in FIG. 8, the groove 321 is provided in a honeycomb shape. In this case, the degree of freedom in arranging the conduction pins 2 is increased. The honeycomb shape may mean that the groove 321 is composed of a plurality of polygons in a plan view. Examples of the polygon may include a hexagon, an octagon, etc. Note that the groove 321 may be provided so as to surround the brazing portions 5 respectively.

[0043] As in an example shown in FIG. 2, the shape of the groove 321 in a plan view may be linear. Note that the shape of the groove 321 in a plan view is not limited to being linear. The shape of the groove 321 in a plan view may be, for example, curved, or may be a shape combining a linear shape and a curved shape. The shape of the groove 321 may be zigzag, meandering, comb-tooth shaped, or wavy. In the case of these shapes, they may have an irregular or regular pattern.

[0044] As in an example shown in FIG. 3, the main surface 32 on the side having the brazing portion 5 may be located on the high-pressure side A1, and the other main surface 33 without the brazing portion 5 may be located on the low-pressure side A2. The high-pressure side A1 may mean the side with relatively high pressure, and the low-pressure side A2 may mean the side with relatively low pressure. When using the hermetic terminal 1, the main surface 32 on the side having the brazing portion 5 may be located at a place with higher pressure than the other main surface 33. For example, when the hermetic terminal 1 is attached to a pressure-resistant container, the main surface 32 on the side having the brazing portion 5 may be located inside the pressure-resistant container, and the other main surface 33 may be located outside the pressure-resistant container. Note that the position of the main surface 32 on the side having the brazing portion 5 is not limited to the high-pressure side A1, and may be the low-pressure side A2.

[0045] In FIGS. 1 to 8, an airtight terminal in which the main surface 32 has a groove 321 has been described as an example. However, instead of the groove 321, the main surface 32 may be provided with linear protrusions (not shown) that partition the brazing portions 5 respectively, and the shape of these protrusions may be a U-shape, a V-shape, or a trapezoid shape. These shapes of the protrusions are the shapes in a cross-section orthogonal to the extending direction of the protrusions (the longitudinal direction of the protrusions). By providing the protrusions that partition the brazing portions 5 respectively, the creepage distance between adjacent conductive pins 2 becomes longer, so that the risk of dielectric breakdown can be suppressed. Further, when the shape of the protrusion is a U-shape, a V-shape, or a trapezoid shape, when molding the insulating member 3 by uniaxial press molding, cold isostatic pressing (CIP) molding, etc., demolding becomes easier than when the protrusion is rectangular, so that microcracks are less likely to occur around the top surface of the protrusion. Therefore, even if the temperature drop and temperature rise are repeated, the airtight terminal can be used over a long period of time.

[0046] In the case of the trapezoid-shaped protrusion, in a cross-section orthogonal to the extending direction of the protrusion, the width intersecting the main surface may be larger than the width of the top surface. Note that the U-shaped protrusion does not necessarily have to be strictly U-shaped, and may include some curvature as long as the effect is obtained. This also applies to the V-shaped protrusion and the trapezoid-shaped protrusion.

[0047] The protrusion is not limited to a specific size. For example, in a cross-section orthogonal to the extending direction of the protrusion, the width of the protrusion intersecting the main surface may be set to about 0.5 mm or more and 2 mm or less. Also, the height of the protrusion may be set to about 0.5 mm or more and 2 mm or less.

[0048] The protrusion may be trapezoid-shaped, and the top surface of the protrusion may be convexly curved in the height direction of the protrusion from the main surface 32 side of the side provided with the brazing portion 5 toward the top surface side of the protrusion.

[0049] As described above, when the top surface is convexly curved, the creepage distance between adjacent conductive pins 2 becomes longer than in the case of an isosceles trapezoid with a flat top surface, so the effect of suppressing the risk of dielectric breakdown is further enhanced.

[0050] In this case, the radius of curvature of the top surface is preferably 300 μm or more and 350 μm or less. When the radius of curvature of the top surface is 300 μm or more, the curvature of the top surface becomes small, and the generation of cracks starting from the top surface can be suppressed. When the radius of curvature of the top surface is 350 μm or less, the protrusions become higher, and the effect of suppressing the risk of dielectric breakdown is further enhanced.

[0051] The average value of the cutting level difference (Rδc), which represents the difference between the cutting level at a 25% load length ratio and the cutting level at a 75% load length ratio in the roughness curve, of the top surface of the protrusion may be 1 μm or more and 2.2 μm or less, or may be 1.3 μm or more and 2.2 μm or less.

[0052] When the average value of the cutting level difference (Rδc) of the top surface of the protrusion is equal to or greater than the above-mentioned lower limit value, the contact angle with respect to pure water becomes small. Therefore, when the dirt adhering to the top surface is washed with pure water, the dirt can be easily removed. Also, when the average value of the cutting level difference (Rδc) of the top surface of the protrusion is equal to or less than the above-mentioned upper limit value, the surface properties become good, so large-scale particle detachment is less likely to occur, and even if such particle detachment occurs, it is less likely to float or scatter and have an adverse effect. The top surface of the protrusion is, for example, a polished surface, a ground surface, or a fired surface.

[0053] The ratio R4 / R3 of the average value R4 of the average length (RSm) to the average value R3 of the arithmetic mean roughness (Ra) in the roughness curve of the top surface of the protrusion may be 5 or more.

[0054] As the ratio R4 / R3 increases, the average period of the unevenness on the top surface becomes longer, and the average depth of the recessed part of the unevenness becomes shallower. When the ratio R4 / R3 is 5 or more, even if the temperature increase and decrease are repeated, since there are few deep recesses on the top surface, the occurrence of microcracks can be suppressed.

[0055] The ratio R4 / R3 may be 30 or less.

[0056] The measurement conditions for the cutting level difference (Rδc), arithmetic mean roughness (Ra), and average length (RSm) of the top surface of the protrusion are the same as the above-described measurement conditions, except that the bottom surface 321a is replaced with the top surface of the protrusion.

[0057] The protrusions may be provided radially from the axis S of the insulating member 3 toward the outer periphery.

[0058] The protrusions may be provided in a honeycomb shape.

[0059] <Compressor> Next, the compressor according to the non-limiting embodiment of the present disclosure will be described with reference to the drawings, taking the case of including the above-described airtight terminal 1 as an example.

[0060] As shown in an example in FIG. 9, the compressor 100 includes a casing 101 (pressure-resistant container) and an airtight terminal 1. The casing 101 houses a motor 102 for compressing a refrigerant. The airtight terminal 1 is attached to the casing 101. Electric power from an external power source 103 is supplied to the motor 102 via a conduction pin 2. In these cases, since the compressor 100 includes the airtight terminal 1 in which insulation breakdown is less likely to occur, stable operation over a long period is possible.

[0061] The airtight terminal 1 may be attached to the casing 101 by welding, for example. The motor 102 may be a three-phase motor, for example. The external power source 103 may be a three-phase AC power source, for example. The motor 102 and the external power source 103 may be electrically connected to the conduction pin 2 via a wiring 104.

[0062] The compressor 100 may include a compression mechanism 105, a suction pipe 106, and a discharge pipe 107. The compression mechanism 105 is housed in a casing 101. The suction pipe 106 and the discharge pipe 107 are attached to the casing 101. The suction pipe 106 and the discharge pipe 107 may be attached to the casing 101 by welding, for example.

[0063] The compression mechanism 105 is driven by a motor 102 and compresses the refrigerant. The suction pipe 106 sends the refrigerant to the compression mechanism 105. The discharge pipe 107 discharges the refrigerant compressed by the compression mechanism 105 and sends it out to the refrigerant circulation system.

[0064] When the compressor 100 includes the above-described compression mechanism 105, suction pipe 106, and discharge pipe 107, power from an external power source 103 is supplied to the motor 102 via the hermetic terminal 1, and the compression mechanism 105 can compress the refrigerant by driving the motor 102. Further, the refrigerant flows into the compression mechanism 105 from the suction pipe 106, and the compressed refrigerant flows out from the discharge pipe 107 and is sent to the refrigerant circulation system.

[0065] As described above, embodiments according to the present disclosure have been illustrated. However, it goes without saying that the present disclosure is not limited to the above embodiments and can be anything as long as it does not depart from the gist of the present disclosure.

[0066] For example, in the above embodiment, the case where the hermetic terminal 1 is for a compressor used in a refrigerator has been described as an example. However, the hermetic terminal 1 can also be applied to other uses. Examples of other uses include, for example, a sensor unit, an aluminum electrolytic capacitor, a relay contact device, a medical device, a storage device, a compressor driven by an electric motor used in a hybrid vehicle or an electric vehicle, and the like.

Description of Reference Numerals

[0067] 1 ··· Hermetic terminal 2 ··· Conductive pin 3 ··· Insulating member 31 ··· Through hole 32···The main surface on the side with the brazing part 321···Groove 321a···Bottom surface 322···U-groove 323···V-groove 324···Isosceles trapezoidal groove 33···The other main surface 34···Convex part 341···Convex surface 4···Annular member 5···Brazing part 51···The first brazing part 52···The second brazing part 53···The third brazing part 100···Compressor 101···Casing 102···Motor 103···External power source 104···Wiring 105···Compression mechanism 106···Suction pipe 107···Discharge pipe S···Axis center A1···High-pressure side A2···Low-pressure side

Claims

1. A plurality of conductive pins, a disc-shaped or columnar insulating member having a plurality of through holes in the thickness direction for individually inserting the conductive pins, an annular member surrounding the insulating member, and a plurality of brazing portions for fixing the conductive pins respectively on one main surface side of the insulating member, and is a hermetic terminal, wherein the main surface on the side of the insulating member having the brazing portions is provided with grooves for partitioning the brazing portions respectively, the shape of the groove is a U shape, a V shape or a trapezoid shape, the insulating member includes a small-diameter portion and a large-diameter portion having an outer diameter larger than that of the small-diameter portion in order from the main surface side having the brazing portions in the direction along the axis of the insulating member, the groove is provided radially from the axis of the insulating member toward the outer periphery, extends to the outer periphery of the small-diameter portion, and is in contact with a space located between the side surface of the small-diameter portion facing the annular member and the annular member without contacting the annular member, and is a hermetic terminal.

2. The hermetic terminal according to claim 1, wherein the groove is in a trapezoid shape, and the bottom surface of the groove is curved convexly in the depth direction.

3. The hermetic terminal according to claim 2, wherein the average value of the cutting level difference (Rδc), which represents the difference between the cutting level at a 25% load length rate and the cutting level at a 75% load length rate in the roughness curve, of the bottom surface of the groove is 1 μm or more and 2.2 μm or less.

4. The hermetic terminal according to any one of claims 2 or 3, wherein the ratio R2 / R1 of the average value R2 of the average length (RSm) to the average value R1 of the arithmetic mean roughness (Ra) in the roughness curve of the bottom surface of the groove is 5 or more.

5. The hermetic terminal according to any one of claims 1 or 2, wherein the groove is provided in a honeycomb shape.

6. A plurality of conductive pins, a disc-shaped or columnar insulating member having a plurality of through holes in the thickness direction for individually inserting the conductive pins, an annular member surrounding the insulating member, and a plurality of brazing portions for fixing the conductive pins respectively on one main surface side of the insulating member, and is a hermetic terminal, wherein the main surface on the side of the insulating member having the brazing portions is provided with linear protrusions for partitioning the brazing portions respectively, the shape of the linear protrusion is a U shape, a V shape or a trapezoid shape, The insulating member includes, in a direction along the axis of the insulating member, in order from the main surface side on the side having the brazing portion, a small-diameter portion and a large-diameter portion having an outer diameter larger than that of the small-diameter portion. The linear protrusion is provided radially from the axis of the insulating member toward the outer periphery, extends to the outer periphery of the small-diameter portion, and is in contact with a space located between the side surface of the small-diameter portion facing the annular member and the annular member without contacting the annular member. An airtight terminal.

7. The airtight terminal according to claim 6, wherein the linear protrusion has a trapezoidal shape with equal legs, and the top surface of the linear protrusion is curved convexly in the height direction.

8. The airtight terminal according to claim 7, wherein the average value of the cutting level difference (Rδc), which represents the difference between the cutting level at a 25% load length ratio and the cutting level at a 75% load length ratio in the roughness curve, of the top surface of the linear protrusion is 1 μm or more and 2.2 μm or less.

9. The airtight terminal according to any one of claims 7 or 8, wherein the ratio R4 / R3 of the average value R4 of the average length (RSm) to the average value R3 of the arithmetic mean roughness (Ra) in the roughness curve of the top surface of the linear protrusion is 5 or more.

10. The airtight terminal according to any one of claims 1 or 6, wherein the average value of the cutting level difference (Rδc), which represents the difference between the cutting level at a 25% load length ratio and the cutting level at a 75% load length ratio in the roughness curve, of the main surface on the side having the brazing portion is 1 μm or more and 2.2 μm or less.

11. A casing that houses a motor for compressing a refrigerant, An airtight terminal according to any one of claims 1 or 6 attached to the casing, and A compressor that supplies electric power from an external power source to the motor via the conduction pin.

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