Hermetic connection and pressure-resistant container

Abstract

A hermetic connection (10, 20), comprising: a metal base (11, 21) which is provided with a sealing hole; a conduit (12, 22) which is inserted into the sealing hole; an insulating material (13, 23) that hermetically seals the metal base (11, 21) and the conduit (12, 22); and a heat-insulating element (14, 24) arranged to cover at least a partial surface of the hermetic connection (10, 20) located in a pressure-resistant container (35) after the hermetic connection (10, 20) has been attached to the pressure-resistant container (35) and comes into contact with a refrigerant sealed in the pressure-resistant container (35), wherein the heat-insulating element (14, 24) consists of rubber selected from hydrogenated nitrile butadiene rubber (HNBR) and ethylene propylene diene monomer (EPDM), characterized in that - the rubber contains at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%; and / or - the rubber contains at least one hindered phenolic antioxidant selected from a monophenolic antioxidant, a bisphenolic antioxidant and a polyphenolic antioxidant in an amount of less than 10% by mass.

Description

TECHNICAL AREA

[0001] The present disclosure relates to a hermetic connection and a pressure-resistant container equipped with this connection. STATE OF THE ART

[0002] A hermetic connector refers to a connection in which a conductor is hermetically sealed in a loop or insertion hole on a metal base using a glass insulating material. The hermetic connector is used to supply power to an electrical device or element housed in a hermetic container, or to transmit a signal from the electrical device or element to the outside. For example, WO 2010 / 117000 (PTL 1) discloses a hermetic connector intended for use in a compressor for a refrigerator or air conditioner.The hermetic connection disclosed in PTL 1 is equipped with a metal base comprising an upper plate, a tube extending downwards from an outer circumferential end of the upper plate, a flange extending obliquely outwards from a lower end of the tube, and three circular holes extending inwards from the upper plate, each forming a conduit sealing hole. The conduit is hermetically sealed in the conduit sealing hole arranged on the metal base using a glass insulating material.

[0003] In a hybrid vehicle, the engine is stopped to reduce its environmental impact when the vehicle is temporarily stopped by a traffic light or similar. In this case, if the compressor is driven by the engine, the air conditioning will also stop every time the vehicle is stopped, which is not desirable in summer or winter, and especially in extremely cold or extremely hot climates.

[0004] In a hybrid vehicle or an electric vehicle, a compressor driven by an electric motor can be used instead of a compressor driven by a motor.

[0005] If the compressor is driven by an electric motor, similar to an interior air conditioning system, the compressor and electric motor are enclosed in a hermetically sealed container. To install the vehicle compressor and electric motor in a confined engine compartment, it is preferable for the compressor to be as small and lightweight as possible. The electric motor is driven by electrical energy supplied through a hermetically sealed connector, which is secured in a connector mounting hole on the hermetically sealed container. As disclosed, for example, in CN206098769U (PTL 2), the pins of the hermetically sealed connector are arranged linearly (in a line) to save space.

[0006] A hermetic connection according to the preamble of main claim 1 is disclosed in DE 10 2010 043 773 A1. Further examples of hermetic connections are disclosed in DE 11 2019002 790 T5, US 5 017 740 A, US 4 830 630 A, DE 101 17 976 A1, JP 2015 - 183 668 A, US 2004 / 0 253 124 A1, DE 11 2017 000 295 T5 and KR 10 1 513 239 B1. CITATION LIST PATENT LITERATURE PTL 1: WO2010 / 117000 PTL 2: CN206098769U SUMMARY OF THE INVENTIONAL PROBLEM

[0007] In the vehicle compressor, driven by an electric motor, a hermetic fitting is mounted in a fitting hole located on the hermetic container housing the refrigerant, lubricating oil, and the electric motor. Electrical energy is supplied to the electric motor via the hermetic fitting from a power source. The electric motor uses this energy to compress and circulate the refrigerant, facilitating heat exchange between the vehicle's interior and exterior. This causes the hermetic fitting to come into contact with the refrigerant in the container, cooling its metal surface and leading to the formation of condensation on the surface of the fitting or its metal base outside the container. Condensation is not ideal from an electrical insulation perspective.However, a conventional hermetic connection is not configured to prevent dew droplets from forming on the surface of the conduit or the metal base.

[0008] Traditionally, in a hermetic refrigerator connection, an insulating layer such as silicone rubber is applied to the metal base and the external conduit to improve electrical insulation. Silicone rubber is not resistant to refrigerants and oils and therefore cannot be applied to the inside of the container.

[0009] One purpose of the present disclosure is to provide a hermetic connection that can prevent dew droplets from forming on its outer surface, and a pressure-resistant container equipped with the hermetic connection for an electric vehicle compressor. SOLUTION TO THE PROBLEM

[0010] This problem is solved by a hermetic connection having the features of claim 1 and a pressure-resistant container having the features of claim 13. Advantageous embodiments are specified in the dependent claims.

[0011] Covering the exposed surface of the hermetic fitting inside the pressure-resistant container with the heat-insulating element prevents the metal surface of the hermetic fitting from coming into contact with the refrigerant. Since the inner surface of the metal base or the pipe is not directly cooled by the refrigerant, the formation of condensation on the outer surface of the hermetic fitting is prevented.

[0012] The heat-insulating element can consist of an electrical insulating material with refrigerant and oil resistance.

[0013] According to the invention, the heat-insulating element is made of rubber, selected from hydrogenated nitrile butadiene rubber (HNBR) and ethylene propylene diene monomer (EPDM).

[0014] The rubber that forms the heat-insulating element can be soot-free or contain a very small amount of soot.

[0015] According to the invention, the rubber comprises at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%.

[0016] Additionally or alternatively, the rubber according to the invention comprises at least one hindered phenolic antioxidant selected from a monophenolic antioxidant, a bisphenolic antioxidant and a polyphenolic antioxidant in an amount of less than 10% by mass.

[0017] The heat-insulating element may include a section extending along at least one surface of the conduit located inside the pressure-resistant container after the hermetic fitting has been attached to the pressure-resistant container, and covering the conduit except for a tip end.

[0018] The section of the heat-insulating element that covers the conduit may be equipped with an annular projection that surrounds an outer circumference of the heat-insulating element.

[0019] The annular projection can have an outer diameter that corresponds to an inner diameter of a connector that is connected to a cable of an electric motor located in the pressure-resistant container to prevent refrigerant and lubricating oil from entering the connector.

[0020] Several ring-shaped projections can be provided. The multiple ring-shaped projections can be spaced apart from each other.

[0021] The heat-insulating element may include a section covering a surface of the metal base extending to an inner wall of a connection mounting hole located on the pressure-resistant vessel after the hermetic connection has been attached to the pressure-resistant vessel.

[0022] The heat-insulating element may be provided to form at least the entire surface of the hermetic connection located within the connection mounting hole arranged on the pressure-resistant vessel, with the exception of the tip end of the line located within the pressure-resistant vessel after the hermetic connection has been attached to the pressure-resistant vessel, and the tip end may be inserted into a connector that is connected to a cable of an electric motor arranged in the pressure-resistant vessel.

[0023] The metal base may have several through holes for screwing.

[0024] The metal base may be provided with several sealing holes arranged in a straight line.

[0025] A pressure-resistant container can be equipped with any of the above-mentioned hermetic connections. ADVANTAGEOUS EFFECT OF THE INVENTION

[0026] According to the hermetic connection as described in one embodiment of the present disclosure, it is possible to prevent dew droplets from forming on the outer surface of the hermetic connection. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a hermetic connection 10 according to the present disclosure, wherein Fig. 1(a) a top view of the hermetic connection as seen from its inside, Fig. 1(b) a front view of the hermetic connection is, Fig. 1(c) a bottom view of the hermetic connection as seen from an outside of it, and Fig. 1(d) is a side view of the hermetic connection. Fig. Figure 2 shows a hermetic connection 20 according to the present disclosure, wherein Fig. 2(a) a top view of the hermetic connection as seen from its inside, Fig. 2(b) a front view of the hermetic connection is, Fig. 2(c) a bottom view of the hermetic connection as seen from an outside of it, and Fig. 2(d) is a side view of the hermetic connection. Fig. Figure 3 shows the hermetic connection according to the present disclosure after it has been attached to the pressure-resistant container, wherein Fig. 3 (a) a top view of the hermetic connection, seen from the inside of the pressure-resistant container and from which a connector of an electric motor is removed and Fig. 3 (b) is a partial cross-sectional view of the hermetic connection as seen from the front of the pressure-resistant container. DESCRIPTION OF THE EXECUTION FORMS

[0027] A hermetic connection according to the present disclosure comprises a metal base provided with at least one sealing hole, a conduit inserted into the sealing hole arranged on the metal base, an insulating material hermetically sealing the metal base and the conduit; and a heat-insulating element arranged to cover at least a partial surface of the hermetic connection located in a pressure-resistant container after the hermetic connection has been attached to the pressure-resistant container and comes into contact with a refrigerant sealed in the pressure-resistant container.

[0028] If required, a predetermined surface of the thermally insulating element can be provided with an annular projection that surrounds an outer circumference of the thermally insulating element and has an outer diameter corresponding to the inner diameter of a connector wired to an electric motor. Since the exposed surface of the hermetic connection within the pressure-resistant vessel is covered by the thermally insulating element, at least the metal surface of the hermetic connection covered by the thermally insulating element does not come into direct contact with the refrigerant.Since the surface of the metal base or the piping of the hermetic connection in the pressure-resistant container is covered with the heat-insulating element, it is not directly cooled by the refrigerant, thus preventing dew droplets from forming on the outer surface of the hermetic connection located outside the pressure-resistant container.

[0029] The heat-insulating element according to the present invention consists of an electrical insulating material with refrigerant and oil resistance. Suitable materials for the heat-insulating element include, for example, hydrogenated nitrile butadiene rubber (HNBR) and ethylene propylene diene monomer (EPDM).

[0030] Carbon black can be added to a stabilizer to prevent a deterioration of the physical properties of the thermal insulation element. However, if the amount of carbon black added is too large, the electrical insulation and dielectric strength of the thermal insulation element can deteriorate. In the thermal insulation element according to the present disclosure, the amount of carbon black added is reduced as much as possible to meet the requirements for electrical insulation and dielectric strength of the hermetic connection. Generally, when providing refrigerant and oil resistance to HNBR, carbon black is added in the range of several percent to less than 10%, wherein the HNBR used in the thermal insulation element for a hermetic connection according to the present embodiment is carbon black-free or contains a very small amount of carbon black to improve the electrical insulation.In other words, the amount of carbon black added to the HNBR used in the hermetic connection of the present embodiment was reduced more than usual. The HNBR is formulated with at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%.

[0031] Additionally or alternatively, the heat-insulating element of the hermetic connection is designed with at least one hindered phenolic antioxidant (aging inhibitor), selected from a monophenolic antioxidant with a backbone containing a phenolic hydroxyl group in an aromatic ring, a bisphenolic antioxidant with a backbone containing two aromatic rings and a phenolic hydroxyl group in each aromatic ring, and a polyphenolic antioxidant with a backbone containing two phenolic hydroxyl groups in an aromatic ring in an amount of less than 10% by mass.

[0032] As in Fig. As shown in Figure 1, a hermetic connection 10 of the present disclosure comprises a metal base 11 provided with a sealing hole, a conduit 12 inserted into the sealing hole provided on the metal base 11, a glass insulating material 13 hermetically sealing the metal base 11 and the conduit 12, and a heat-insulating element 14. After the hermetic connection 10 is attached to a pressure-resistant container 35, the heat-insulating element 14 covers the surface of the metal base 11, the conduit 12, and the insulating material 13 located in the pressure-resistant container 35 and in contact with the refrigerant sealed therein.

[0033] As in Fig. As shown in Figure 3, the hermetic connection 10 is hermetically fastened in a connection mounting hole 36, which is provided on the pressure-resistant container 35, in which an electric motor is housed together with the refrigerant and the lubricating oil, by means of fastening means such as screws 37.

[0034] A part of the heat-insulating element 14, which covers the conduit 12, can be described as having an annular projection (designated by a reference number 210 in Fig. 2) shall be provided with a feature that surrounds the outer circumference of the heat-insulating element 14. The annular projection has an outer diameter corresponding to the inner diameter of a connector 39, which is connected to a cable 38 of the electric motor located in the pressure-resistant container 35, to prevent the refrigerant and lubricating oil from entering the connector 39.

[0035] By covering the exposed surface of the hermetic connection 10, which is located in the pressure-resistant container (see Fig. 1 (a)), with the heat-insulating element 14, the metal base 11 and the glass insulating material 13 of the hermetic connection 10 are prevented from coming into contact with the refrigerant. In this case, the heat-insulating element 14 is arranged to completely cover at least the entire surface of the hermetic connection 10 located within the connection mounting hole 36, which is arranged on the pressure-resistant vessel 35, except for the tip end of the line 12 inside the pressure-resistant vessel. Since the tip end of the inner line 12 for connection to the electric motor is fully inserted into the connector 39, the surface of the metal base and the line of the hermetic connection 10 do not come into contact with the refrigerant and are not cooled by it. Thus, it is possible to prevent the formation of a refrigerant on the outer surface ( Fig. 1 (c)) of the hermetic connection 10 outside the pressure-resistant container, dew droplets may form. Certain effects can be achieved if the heat-insulating element 14 is arranged to cover part of the surface of the hermetic connection that comes into contact with the refrigerant and the lubricating oil in the pressure-resistant container.

[0036] The thermal insulation element 14 can be made of any material, as long as it is an electrical insulating material with refrigerant and oil resistance. According to the invention, a rubber such as HNBR or EPDM is used in a suitable manner as the material of the thermal insulation element 14.

[0037] If, for example, the heat-insulating element 14 consists of HNBR, which has a slightly low specific electrical resistance of 10 11If the HNBR has a specific electrical resistance of Ω cm, it is generally preferred that the HNBR be carbon black-free or contain a very small amount of carbon black and be formulated with at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%. Furthermore, it is acceptable that the HNBR be further formulated with at least one hindered phenolic antioxidant selected from a monophenolic antioxidant, a bisphenolic antioxidant, and a polyphenolic antioxidant in an amount of less than 10 wt%. By adjusting the composition of the HNBR in the thermal insulation element 14 within the above range, the specific electrical resistance of the HNBR can be reduced to approximately 10 15 Ω cm can be improved.

[0038] According to the present disclosure, since at least a part of the hermetic connection 10, which comes into contact with the refrigerant, is covered by the thermal insulation element 14, which has refrigerant resistance, oil resistance and electrical insulation, it is possible to prevent the formation of dew droplets and to improve the tracking resistance, electrical insulation and voltage resistance of the hermetic connection 10 by increasing the creepage distance between the metal base 11 and the line 12, which is located in the pressure-resistant container.

[0039] Furthermore, in the hermetic connection 10 of the present revelation, as in Fig. Figure 3 shows that the outer diameter of the thermal insulation element 14, which covers the outer circumference of the line 12 located in the pressure-resistant container, is adjusted to correspond to the inner diameter of the connector 39 to which the hermetic fitting 10 is attached. This allows the connector to be sealed to prevent lubricating oil (such as polyalkylene glycol (PAG) oil) or similar substances with low electrical insulation from penetrating the connector enclosing a cable connection section. This prevents the electrical insulation of the hermetic fitting 10 from being compromised by the lubricating oil. [Versions]

[0040] As in Fig. As shown in Figure 1, a hermetic connection 10 according to a first embodiment of the present disclosure comprises a metal base 11 made of carbon steel and provided with several through holes 100 for screwing and three sealing holes arranged in a straight line, a conduit 12 made of an iron-ferrous alloy and inserted into each sealing hole provided on the metal base 11, an insulating material 13 made of borosilicate glass and configured to hermetically seal the metal base 11 and the conduit 12, and a thermal insulation element 14. The thermal insulation element 14 is made of HNBR and is configured to cover a partial surface of the metal base 11, the conduit 12, and the insulating material 13 that is located inside the pressure vessel and comes into contact with the refrigerant after the hermetic connection 10 is attached to the pressure vessel.

[0041] A section of the heat-insulating element 14 extends along the surface of the pipe 12, which is located in the pressure-resistant container (see Fig. 1 (a)), and covers the conduit 12 except for its tip end. The other section of the thermal insulation element 14 covers the entire surface of the insulating material 13 and extends beyond the edge of the sealing hole arranged on the metal base 11 to cover a surface of the metal base 11 extending to the inner wall of the connection mounting hole 36 of the pressure-resistant container 35 to which the hermetic connection 10 is attached.

[0042] Although the metal surface, as in Fig. 1 (a) shown, the tip end of the line 12, which is located in the pressure-resistant container, is exposed. The tip end is inserted into the connector 39, which is wired to the electric motor, as shown in Fig. 3, is arranged within the pressure-resistant container 35 and is therefore not released to the outside during use. Since the exposed surface of the hermetic connection 10, which is located in the pressure-resistant container, is completely covered with the heat-insulating element 14 made of HNBR, the refrigerant and the lubricating oil are prevented from coming into direct contact with the metal base 11 of the hermetic connection 10 and the glass insulating material 13. Thus, the surface of the metal base 11 and the line 12 of the hermetic connection 20 is not directly cooled by the refrigerant, which prevents dew droplets from forming on the outer surface of the hermetic connection 10 outside the pressure-resistant container (see Figure 3). Fig. 1 (c)).

[0043] The HNBR of the thermally insulating element 14 is carbon black-free or contains a very small amount of carbon black and is formulated with at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%, and is further formulated with at least one hindered phenolic antioxidant selected from a monophenolic antioxidant, a bisphenolic antioxidant, and a polyphenolic antioxidant in an amount of less than 10 wt% to improve electrical insulation. Increasing the creepage distance between the metal base 11 and the conductor 12 located in the pressure-resistant container improves tracking resistance, electrical insulation, and voltage resistance.

[0044] As in Fig. As shown in Figure 2, a hermetic connection 20 according to a second embodiment of the present disclosure comprises a metal base 21 made of carbon steel and provided with several through holes 200 for screwing and three sealing holes arranged in a straight line, a conduit 22 made of an iron-based Fe-Cr alloy and inserted into each sealing hole arranged on the metal base 21, an insulating material 23 made of soda-barium glass and configured to hermetically seal the metal base 21 and the conduit 22, and a heat-insulating element 24. The heat-insulating element 24 is made of EPDM and is configured to cover a partial surface of the metal base 21, the conduit 22, and the insulating material 23 that are located inside the pressure-resistant vessel and come into contact with the refrigerant after the hermetic connection 20 is attached to the pressure-resistant vessel.

[0045] A section of the heat-insulating element 24 extends along the surface of the pipe 22, which is located in the pressure-resistant container (see Fig. 2 (a)), and covers the conduit 22 except for its tip end. The other section of the thermal insulation element 24 covers the entire surface of the insulating material 23 and extends beyond the edge of the sealing hole arranged on the metal base 21 to cover a surface of the metal base 21 extending to the inner wall of the terminal mounting hole 36 to which the hermetic connector 20 is attached.

[0046] The section of the thermal insulation element 24 covering the conduit 22 is equipped with several annular projections 210 that surround the outer circumference of the thermal insulation element 24 and are spaced apart from one another. The annular projection 210 has an outer diameter corresponding to the inner diameter of a connector to be wired to an electric motor located in the pressure-resistant container to which the hermetic connection 20 is attached. The annular projection 210 prevents the refrigerant and lubricating oil from penetrating the connector and prevents the connector from falling off.

[0047] Since the exposed surface of the hermetic connection 20, which is located inside the pressure-resistant container, is completely covered with the heat-insulating EPDM element, the refrigerant and lubricating oil are prevented from coming into direct contact with the metal base 21 of the hermetic connection. Therefore, the surface of the metal base 21 and the line 22 of the hermetic connection 20 is not directly cooled by the refrigerant, thus preventing the formation of dew droplets on the outer surface of the hermetic connection 20, which is located outside the pressure-resistant container (see Fig. 2 (c)).

[0048] In the hermetic connection 20 according to the second embodiment, the heat-insulating element 24, being made of EPDM, exhibits suitable refrigerant resistance and, in particular, oil resistance to polyolester oil (POE). Furthermore, the EPDM can increase the creepage distance between the metal base 21 and the line 22 located in the pressure-resistant container, thus improving the tracking resistance, electrical insulation, and voltage resistance.

[0049] As in Fig. As shown in Figure 3, the hermetic connection according to the present disclosure can be attached such that, after the line is electrically connected to the electric motor housed in the pressure-resistant container 35, the hermetic connection is inserted into the connection mounting hole 36 provided on the pressure-resistant container 35 and is then fastened with screws 37 or the like.

[0050] The conductor of the hermetic connection according to the present disclosure can be coated with a desired coating film on its surface. The conductor and the metal base can be made of any metal material, as long as it is suitable for the hermetic connection. For example, the Fe-Cr alloy can be replaced by an Fe-Ni alloy, carbon steel, a copper alloy, an aluminum alloy, or the like.

[0051] Similarly, the insulating material described in the embodiments is not limited to soda-barium glass, and any glass material can be used as long as it can electrically insulate and hermetically seal the conductor and the metal base. Where necessary, part of the insulating material of the present disclosure may consist of a different glass material. The glass material may be partially or completely replaced by a resin material such as epoxy resin.

[0052] It is understood that the embodiments disclosed herein are presented for illustrative and descriptive purposes only and are not limited in all aspects. It is intended that the scope of this disclosure is not limited to the above description but is defined by the scope of the claims and includes all modifications that are equivalent in meaning and scope to the claims. INDUSTRIAL APPLICABILITY

[0053] The present disclosure applies to a hermetic connection, in particular a hermetic connection for vehicles. REFERENCE MARK LIST

[0054] 10, 20: Hermetic connection; 11, 21: Metal base; 12, 22: Conduits; 13, 23: Insulating material; 14, 24: Heat-insulating element; 35: Pressure-resistant container; 36: Connection mounting hole; 37: Screw; 38: Cable; 39: Connector; 100, 200: Through hole; 210: Ring-shaped projection

Claims

[1] A hermetic connection (10, 20), comprising: a metal base (11, 21) which is provided with a sealing hole; a conduit (12, 22) which is inserted into the sealing hole; an insulating material (13, 23) that hermetically seals the metal base (11, 21) and the conduit (12, 22); and a heat-insulating element (14, 24) arranged to cover at least a partial surface of the hermetic connection (10, 20) located in a pressure-resistant container (35) after the hermetic connection (10, 20) has been attached to the pressure-resistant container (35) and comes into contact with a refrigerant sealed in the pressure-resistant container (35), wherein the heat-insulating element (14, 24) consists of rubber selected from hydrogenated nitrile butadiene rubber (HNBR) and ethylene propylene diene monomer (EPDM), characterized by , that - the rubber contains at least one inorganic filler selected from silicon dioxide and magnesium silicate in an amount of 1 to 5 wt%; and / or - the rubber contains at least one hindered phenolic antioxidant selected from a monophenolic antioxidant, a bisphenolic antioxidant and a polyphenolic antioxidant in an amount of less than 10% by mass. [2] The hermetic connection (10, 20) according to claim 1, wherein the heat-insulating element (14, 24) consists of an electrical insulating material with refrigerant resistance and oil resistance. [3] The hermetic connection (10, 20) according to claim 1 or 2, wherein the rubber forming the heat-insulating element is carbon black-free. [4] The hermetic connection (10, 20) according to any one of claims 1 to 3, wherein the heat-insulating element (14, 24) comprises a section extending along at least one surface of the conduit (12, 22) located inside the pressure-resistant container (35) after the hermetic connection (10, 20) has been attached to the pressure-resistant container (35), and covering the conduit (12, 22) except for a tip end. [5] The hermetic connection (20) according to claim 4, further comprising an annular projection (210), wherein the section of the heat-insulating element (24) covering the conduit (22) is provided with the annular projection (210) which surrounds an outer circumference of the heat-insulating element (24). [6] The hermetic connection (20) according to claim 5, wherein the annular projection (210) has an outer diameter corresponding to the inner diameter of a connector (39) connected to a cable of an electric motor located in the pressure-resistant container (35) to prevent refrigerant and lubricating oil from entering the connector (39). [7] The hermetic connection (20) according to claim 5 or claim 6, further comprising a plurality of annular projections (210), including the annular projection (210). [8] The hermetic connection (20) according to claim 7, wherein the plurality of annular projections (210) are spaced apart from each other. [9] The hermetic connection (10, 20) according to any one of claims 1 to 8, wherein the heat-insulating element (14, 24) comprises a section covering a surface of the metal base (11, 21) extending to an inner wall of a connection mounting hole (36) arranged on the pressure-resistant container (35) after the hermetic connection (10, 20) has been attached to the pressure-resistant container (35). [10] The hermetic connection (10, 20) according to any one of claims 1 to 9, wherein the heat-insulating element (14, 24) is arranged such that it forms at least the entire surface of the hermetic connection (10, 20) which is located within one of the connection mounting holes (36) which is arranged on the pressure-resistant container (35), with the exception of the tip end of the line (12, 22) which is located inside the pressure-resistant container (35) after the hermetic connection (10, 20) has been attached to the pressure-resistant container (35), and the tip end is configured such that it can be inserted into a connector (39) which is connected to a cable of an electric motor which is arranged in the pressure-resistant container (35). [11] The hermetic connection (10, 20) according to one of claims 1 to 10, wherein the metal base (11, 21) is provided with a plurality of through holes (100, 200) for screwing. [12] The hermetic connection (10, 20) according to one of claims 1 to 11, wherein the metal base (11, 21) is provided with a plurality of sealing holes arranged in a straight line. [13] A pressure-resistant container (35) equipped with a hermetic connection (10, 20) according to any one of claims 1 to 12.

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