Operation rotation unit of gas switchgear

Abstract

Disclosed is an operation rotation unit of a gas switchgear. The operation rotation unit of a gas switchgear has excellent sealing performance and prevents atmospheric pollution. According to an embodiment of the present invention, the operation rotation unit is an operation rotation unit mounted on a gas switchgear and comprises a body unit, a first ring unit, a flange unit, a bearing unit, and a second ring unit.

Description

Gas switch operating rotating part

[0001] The present invention relates to a moving rotating part coupled to a gas switch.

[0002] A ring main unit (RMU) is known as a gas switch for high-pressure equipment.

[0003] A ring main unit is a device that branches power from a high-voltage distribution system to other lines or supplies it to consumers. For example, these ring main units may include high-pressure gas load switches, which switch and disconnect loads based on the excellent insulation performance of SF6 gas.

[0004] The ring main unit may be provided in a form in which a circuit breaker and a fuse are combined, depending on the combination form, and specifically, it may be configured by installing a circuit breaker, a switching mechanism, a ground, and a conductor inside a structure sealed and insulated by SF6 gas.

[0005] Fig. 1 shows a front view of a conventional gas switch, Fig. 2 shows a side view of the gas switch of Fig. 1, and Fig. 3 shows an internal side view of the gas switch of Fig. 2.

[0006] A gas switch (specifically, a ring main unit) (1) is used for the purpose of line branching, line division and load protection on a distribution line, and can open and close a load based on excellent insulation performance, or protect the load side through a fuse or circuit breaker.

[0007] The gas switch (1) includes a mechanical device section (11), a gas tank section (12), and a connection section (13).

[0008] Inside the gas tank section (12), a gas container and multiple load switches can be spaced apart. The multiple load switches typically consist of one movable contact and three-phase fixed contacts, and each of these multiple load switches is provided with an arc extinguishing section to extinguish arcs generated when the contacts are opened and closed.

[0009] The mechanical device section (11) is placed on the front of the gas tank section (12) and includes operating mechanisms (parts, devices, etc.) for each circuit.

[0010] The connecting part (13) is placed at the bottom of the mechanical device part (11) and the gas tank part (12), and supports the mechanical device part (11) and the gas tank part (12). A cable or the like is installed in the connecting part (13).

[0011] Gas switches (specifically, ring main units) (1) are generally used in combination with multiple units, as shown in Fig. 1.

[0012] In the machine device section (11) of Fig. 1, reference numeral 101 indicates a status indicator, reference numeral 102 indicates a main circuit operating section, and reference numeral 103 indicates a ground circuit operating section.

[0013] The gas switch (1) can be operated in the inlet, open, and ground states by inserting a handle into the main circuit operation unit (102) and ground circuit operation unit (103) of the mechanical device unit (11). The status indicator (101) rotates 60° and indicates the inlet, open, and ground states.

[0014] The mechanical device unit (11) includes various mechanical parts connected to a status indicator (101), etc. One component of the mechanical device unit (11) is connected to a rotating shaft (14) that is rotatably connected to a gas burner placed inside a gas tank unit (12).

[0015] The rotation shaft (14) penetrates the inner side wall (15) that divides the mechanical device section (11) and the gas tank section (12).

[0016] Specifically, the rotation axis (14) is disposed through the inner side wall (15) and the movable rotation part (2) disposed on one side of the inner side wall (15). One side of the inner side wall (15) represents a surface facing the gas tank part (12).

[0017] It is necessary to seal one side of the inner side wall (15) and the moving rotating part (2) and the area between the moving rotating part (2) and the rotating shaft (14) to prevent gas from leaking.

[0018] Above all, since the rotation shaft (14) must be positioned so as to be rotatable while penetrating the interior of the moving rotation part (2), the sealing between the rotation shaft (14) and the moving rotation part (2) is even more important.

[0019] The conventional operating rotary part (2) is composed only of an O-ring for sealing with the rotary shaft (14), so there is a concern that gas, etc. may leak due to repeated use and aging.

[0020] That is, if a gas switch (1) is installed in a location with extreme annual temperature fluctuations, the rubber O-ring will harden and become hard after several years of winter and summer. If the mechanical device operates under these conditions, gas leaks will occur intermittently. Consequently, if the gas pressure in the gas switch (1) drops below the rated pressure, additional gas injection will be required to maintain the performance of the gas switch (1).

[0021] Therefore, a new rotating part is required to provide excellent sealing performance and prevent pollution of the atmospheric environment due to gas leakage.

[0022] The purpose of the present invention is to provide a moving rotating part of a gas switch that has excellent sealing performance, eliminates the need for additional gas injection, and prevents pollution of the atmospheric environment.

[0023] The above-described object of the present invention is achieved by the following.

[0024] According to an example of an embodiment of the present invention, a movable rotating part is a movable rotating part mounted on a gas switch, and includes a body part, a first ring part, and a flange part. The first ring part is arranged in a through hole of the body part. The flange part is arranged in the through hole of the body part and is arranged adjacent to the first ring part. A rotational shaft is arranged in the through hole of the body part.

[0025] Specifically, the first ring portion is inserted into a first ring portion insertion groove formed on the inner surface of the body portion, and is an O-ring.

[0026] Specifically, the flange portion is positioned at a predetermined distance from the first ring portion in the direction from one side to the other of the through hole of the body portion. The flange portion is inserted into a flange insertion groove formed on the inner surface of the body portion.

[0027] An example of an embodiment of the present invention further includes a rotating member comprising a bearing member and a second ring member. The bearing member is positioned in a through hole of the body member and adjacent to the flange member. The second ring member is positioned in a through hole of the body member and adjacent to the bearing member.

[0028] Specifically, the bearing portion is arranged so as to be spaced apart from the flange portion by a preset distance in the direction from one side to the other of the through hole of the body portion, or so as to be in contact with the flange portion without being spaced apart from it. The bearing portion is inserted into a bearing insertion groove formed on the inner surface of the body portion.

[0029] Specifically, the second ring portion is positioned spaced apart from the bearing portion by a preset distance in the direction from one side to the other of the through hole of the body portion, or is positioned in contact with the bearing portion without being spaced apart from it. The second ring portion is a C-shaped stop ring.

[0030] The operating rotary part of the gas switch according to an example of the embodiment of the present invention has excellent sealing performance and is effective in preventing gas leakage.

[0031] In addition, the operating rotation part of the gas switch according to the embodiment of the present invention has the effect of preventing pollution of the atmospheric environment.

[0032] In addition, the operating rotation part of the gas switch according to the example of the embodiment of the present invention has an effect that can be applied to all electric power devices manufactured by injecting gas.

[0033] More detailed effects of the operating rotary part of the gas switch according to an example of an embodiment of the present invention are described in the specific contents for implementing the invention below.

[0034] Figure 1 shows a front view of a conventional gas switch.

[0035] Figure 2 shows a side view of the gas switch of Figure 1.

[0036] Figure 3 shows an internal side view of the gas switch of Figure 2.

[0037] Fig. 4 is a perspective view showing the operating rotation part of a gas switch according to an example of an embodiment of the present invention.

[0038] Fig. 5 is a cross-sectional view of the operating rotation part illustrated in Fig. 4.

[0039] Fig. 6 shows the flange portion shown in Fig. 5.

[0040] Figure 7 shows A of Figure 6.

[0041] Hereinafter, examples of embodiments of the present invention will be described in more detail with reference to the attached drawings. For components of the present invention that are clearly understandable and easily reproducible by those skilled in the art using conventional techniques, a detailed description thereof will be omitted so as not to obscure the gist of the present invention.

[0042] The attached drawings are only provided to facilitate understanding of examples of embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings.

[0043] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0044] Additionally, terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0045] Below, the operation rotation part of a gas switch according to an example of an embodiment of the present invention will be described.

[0046] The operating rotation part of a gas switch according to an example of an embodiment of the present invention may be briefly referred to as the 'operating rotation part of the present invention' hereinafter.

[0047] Figures 4 and 5 illustrate an operating rotation part (20) of a gas switch according to an example of an embodiment of the present invention. The operating rotation part (20) of the present invention relates to the operating rotation part (2) described in the background technology of the invention and illustrated in Figure 3.

[0048] The operating rotation part (20) of the present invention is applied (or mounted) to a gas switch (1).

[0049] The operating rotation part (20) of the present invention is a component necessary for connecting the mechanical device part (11) and the gas tank part (12).

[0050] The operating rotation part (20) serves to prevent the gas stored in the gas tank part (12) from leaking while allowing the rotating shaft (14) placed inside the operating rotation part (20) to rotate smoothly.

[0051] The operating rotation part (20) includes a body part (21), a first ring part (22), a flange part (23), a bearing part (24), and a second ring part (25).

[0052] The body part (21) forms the body of the moving rotating part (20).

[0053] The body part (21) has a preset length in one direction. The one direction represents, for example, the x-axis direction in Fig. 5. The longitudinal direction of the body part (21) represents the one direction.

[0054] The body part (21) has a through hole (212h) formed in one direction inside. The cross-sectional shape of the through hole (212h) may be circular. The cross-sectional shape of the through hole (212h) represents the shape of the through hole (212h) when the body part (21) is cut in a direction (y-axis direction in FIG. 5) orthogonal to the longitudinal direction (one direction) of the body part (21).

[0055] The body part (21) can rotate with the rotation axis (14) positioned in the through hole (212h).

[0056] The shape of the outer surface of the body portion (21) can be formed into a cylindrical shape with a preset length in one direction. However, the shape of the outer surface of the body portion (21) is not limited to the cylindrical shape and can be formed into various shapes.

[0057] The body portion (21) includes one side and the other side. The one side and the other side represent opposite sides in the longitudinal direction of the body portion (21).

[0058] A connecting portion (211) is formed on one or the other side of the body portion (21).

[0059] The connecting portion (211) is formed by extending outward along the outer edge of the body portion (21) in a direction perpendicular to the longitudinal direction of the body portion (21).

[0060] The connecting portion (211) has a preset length (e.g., thickness) in the longitudinal direction of the body portion (21).

[0061] A fastening hole (211h) is formed in the joint (211) into which a fastening member (not shown) is inserted. The fastening member represents, for example, a screw.

[0062] The fastening hole (211h) represents a hole, but may be formed as a groove.

[0063] The fastening hole (211h) has a preset depth in the longitudinal direction of the body part (21), and a plurality of fastening holes are formed along the circumferential direction of the joining part (211).

[0064] In the through hole (212h) of the body part (21), a first ring part (22), a flange part (23), a bearing part (24), and a second ring part (25) are arranged in sequence in the longitudinal direction of the body part (21).

[0065] The first ring part (22) is placed on one side of the through hole (212h) of the body part (21).

[0066] The first ring portion (22) is formed in a ring shape with a circular cross-section.

[0067] The first ring portion (22) may be, for example, an O-ring.

[0068] The first ring portion (22) is formed of a rubber material and serves to seal the gap between the inner surface (212) of the body portion (21) and the rotation shaft (14). The inner surface (212) of the body portion (21) represents the inner surface surrounding the through hole (212h) of the body portion (21).

[0069] One first ring part (22) is arranged in the body part (21).

[0070] A first ring insertion groove (213) is formed on the inner surface (212) of the body (21).

[0071] The first ring part (22) is placed and fixed in the first ring part insertion groove (213).

[0072] The first ring insertion groove (213) is formed in a recess shape.

[0073] Specifically, the first ring insertion groove (213) has a preset width in one direction (x-axis direction in FIG. 5) and is formed by being sunken from the inner surface (212) of the body portion (21) to a preset depth in a direction orthogonal to the one direction (y-axis direction in FIG. 5).

[0074] The first ring insertion groove (213) is formed in a ring shape. That is, the first ring insertion groove (213) is formed along the circumferential direction on the inner surface (212) of the body (21).

[0075] Fig. 6 shows the flange portion (23) shown in Fig. 5, and Fig. 7 shows A of Fig. 6.

[0076] Referring to FIGS. 4 to 7, the flange portion (23) is placed in the through hole (212h) of the body portion (21).

[0077] The flange portion (23) performs the role of sealing the gap between the flange body (231) and the rotation shaft (14) described later.

[0078] The flange portion (23) is arranged adjacent to the first ring portion (22). Specifically, the flange portion (23) is arranged at a preset distance from the first ring portion (22) in the direction from one side to the other side of the through hole (212h) of the body portion (21).

[0079] A flange insertion groove (214) is formed on the inner surface (212) of the body (21).

[0080] The flange insertion groove (214) is arranged (or formed) adjacent to the first ring insertion groove (213).

[0081] Specifically, the flange insertion groove (214) is arranged (or formed) at a preset distance from the first ring insertion groove (213) in the direction from one side to the other side of the through hole (212h) of the body part (21).

[0082] The flange insertion groove (214) is formed in a groove shape.

[0083] Specifically, the flange insertion groove (214) has a preset width in one direction (x-axis direction in FIG. 5) and is formed by being recessed from the inner surface (212) of the body portion (21) to a preset depth in a direction orthogonal to the one direction (y-axis direction in FIG. 5).

[0084] The flange insertion groove (214) is formed in a ring shape. That is, the flange insertion groove (214) is formed along the circumferential direction on the inner surface (212) of the body portion (21).

[0085] A flange portion (23) is placed in the flange insertion groove (214).

[0086] The flange portion (23) includes a flange body (231), a support member (232), and an elastic member (233).

[0087] The flange body (231) is formed in a ring shape with a circular cross-section.

[0088] The flange body (231) is formed of rubber material.

[0089] The flange body (231) is inserted and placed (or fixed) into the flange insertion groove (214).

[0090] The flange body (231) is divided into an inner body (2311) and an outer body (2312). The inner body (2311) and the outer body (2312) are connected to each other and formed as one piece.

[0091] The inner body (2311) is formed in a ring shape with a circular cross-section.

[0092] The inner body (2311) includes a protrusion (2311c).

[0093] The protrusion (2311c) protrudes from the inner surface (2311a) of the inner body (2311) toward the center point of the inner body (2311) (ring shape) at a preset height. The inner surface (2311a) of the inner body (2311) represents an inner surface surrounding the through hole (2311h) of the inner body (2311).

[0094] The protrusion (2311c) has a cross-section in the shape of an inverted triangle when the protrusion (2311c) is cut in the radial direction.

[0095] The protrusion (2311c) is formed in a circumferential direction along the inner surface (2311a) of the inner body (2311).

[0096] The protrusion (2311c) acts as a sealing lip.

[0097] The outer body (2312) is formed in a circular ring shape.

[0098] The outer body (2312) is inserted and placed into the flange insertion groove (214).

[0099] The outer surface of the outer body (2312) is in contact with the inner surface of the flange insertion groove (214). The inner surface of the flange insertion groove (214) represents the bottom surface of the flange insertion groove (214).

[0100] Since the outer body (2312) is inserted and fitted into the flange insertion groove (214), the flange portion (23) (specifically, the outer body (2312)) is fixed to the flange insertion groove (214).

[0101] The outer body (2312) is positioned radially outside the inner body (2311) and surrounds the inner body (2311) in the circumferential direction.

[0102] The outer body (2312) is formed into an L-shape when the outer body (2312) is cut radially.

[0103] The outer body (2312) has a first extension portion (2312a) and a second extension portion (2312b). The first extension portion (2312a) and the second extension portion (2312b) are connected to each other and formed as one piece.

[0104] The first extension (2312a) extends radially outward from one side of the outer surface (2311b) of the inner body (2311) to a preset length.

[0105] The first extension (2312a) is formed in a circumferential direction along the outer surface (2311b) of the inner body (2311).

[0106] The second extension (2312b) is bent from the outer edge of the first extension (2312a), extends in a direction parallel to the outer surface (2311b) of the inner body (2311) to a preset length, and surrounds the inner body (2311).

[0107] The second extension (2312b) is formed circumferentially along the outer edge of the first extension (2312a).

[0108] When the outer body (2312) is inserted into and fixed in the flange insertion groove (214), the outer surface of the second extension (2312b) comes into contact with the inner surface of the flange insertion groove (214).

[0109] A space (2312s) equal to the preset length of the first extension (2312a) is formed between the second extension (2312b) and the inner body (2311).

[0110] Specifically, a space (2312s) formed by a preset length of the first extension (2312a) is formed between the inner surface (2312b1) of the second extension (2312b) and the outer surface (2311b) of the inner body (2311). The inner surface (2312b1) of the second extension (2312b) and the outer surface (2311b) of the inner body (2311) are surfaces that face each other.

[0111] The support member (232) is placed on the outer body (2312) of the flange body (231).

[0112] The support member (232) is formed in a circular ring shape. In addition, when the support member (232) is cut radially, the support member (232) is formed in an L-shape. The support member (232) corresponds to the shape of the outer body (2312).

[0113] A portion (232a) of the support member (232) is formed in a circular ring shape and extends radially outward to a preset length.

[0114] And, the remaining part (232b) of the support member (232) is formed in a circular ring shape, and is bent from the outer edge of the part (232a) of the support member (232) and extends to a preset length in a direction parallel to the outer surface (2311b) of the inner body (2311).

[0115] A part (232a) of the support member (232) and the remaining part (232b) are connected to each other and formed as one piece.

[0116] A part (232a) of the support member (232) is placed inside the outer body (2312), and the remaining part (232b) is exposed to the outside of the outer body (2312).

[0117] That is, a part (232a) of the support member (232) is placed inside the first extension part (2312a), and the remaining part (232b) is placed on the inner surface (2312b1) of the second extension part (2312b).

[0118] A groove (not designated) for accommodating a portion (232a) of the support member (232) is formed inside the first extension (2312a), and a groove (not designated) for accommodating the remaining portion (232b) of the support member (232) is formed on the inner surface (2312b1) of the second extension (2312b).

[0119] The support member (232) is formed of metal and supports the flange portion (23) (specifically, the flange body (231)). Accordingly, the flange portion (23) (specifically, the flange body (231)) maintains a ring shape.

[0120] The elastic member (233) is arranged on the inner body (2311) of the flange body (231). Specifically, the elastic member (233) is arranged on the outer peripheral surface (2311b) of the inner body (2311).

[0121] The elastic member (233) may be, for example, a coil spring of a preset length.

[0122] The elastic member (233) is formed in a circular ring shape and is arranged in a circumferential direction along the outer surface (2311b) of the inner body (2311).

[0123] A groove (not given a symbol) in which an elastic member (233) is arranged in the circumferential direction is formed on the outer surface (2311b) of the inner body (2311).

[0124] When the protrusion (2311c) formed on the inner body (2311) receives an external force radially outward, the elastic member (233) surrounding the inner body (2311) is elastically deformed radially outward. At this time, the elastic member (233) has a restoring force directed radially inward.

[0125] Accordingly, a rotation shaft (14) is placed in the through hole (2311h) of the inner body (2311), and when the rotation shaft (14) presses the protrusion (2311c) radially outward, the inner body (2311) is pressed radially inward by the restoring force of the elastic member (233).

[0126] Due to this, no gap is created between the protrusion (2311c) of the inner body (2311) and the rotation shaft (14).

[0127] A bearing part (24) is arranged in the through hole (212h) of the body part (21).

[0128] The bearing part (24) facilitates the rotation of the rotation shaft (14) placed inside the bearing part (24).

[0129] The bearing part (24) is arranged adjacent to the flange part (23). Specifically, the bearing part (24) may be arranged spaced apart from the flange part (23) by a preset distance in the direction from one side to the other side of the through hole (212h) of the body part (21), or may be arranged in contact with the flange part (23) without being spaced apart from it.

[0130] A bearing insertion groove (215) is formed on the inner surface (212) of the body (21).

[0131] The bearing insertion groove (215) is arranged (or formed) adjacent to the flange insertion groove (214).

[0132] Specifically, the bearing insertion groove (215) may be arranged (or formed) spaced apart from the flange insertion groove (214) by a preset distance from one side to the other side of the through hole (212h) of the body part (21), or may be arranged (or formed) in contact with the flange insertion groove (214) without being spaced apart from it.

[0133] The bearing insertion groove (215) is formed in a groove shape.

[0134] Specifically, the bearing insertion groove (215) has a preset width in one direction (x-axis direction in FIG. 5) and is formed by being sunk from the inner surface (212) of the body portion (21) to a preset depth in a direction orthogonal to the one direction (y-axis direction in FIG. 5).

[0135] The bearing insertion groove (215) is formed in a ring shape. That is, the bearing insertion groove (215) is formed along the circumferential direction on the inner surface (212) of the body portion (21).

[0136] A bearing part (24) is placed and fixed in the bearing insertion groove (215).

[0137] The bearing part (24) includes a ring-shaped inner ring (241), an outer ring (242) surrounding the inner ring (241), and a ball (243) or roller placed between the inner ring (241) and the outer ring (242). The inner ring (241) and the outer ring (242) can rotate relative to each other.

[0138] A rotation shaft (14) is arranged on the inner ring (241) of the bearing part (24). The rotation shaft (14) can rotate smoothly by the bearing part (24).

[0139] The second ring part (25) is placed in the through hole (212h) of the body part (21).

[0140] The second ring portion (25) is formed in a ring shape. In addition, both ends of the second ring portion (25) are spaced apart by a preset distance.

[0141] The second ring portion (25) may be, for example, a C-type snap ring.

[0142] The second ring portion (25) prevents the bearing portion (24) from coming out from the through hole (212h) of the body portion (21).

[0143] The second ring portion (25) is arranged adjacent to the bearing portion (24). Specifically, the second ring portion (25) may be arranged spaced apart from the bearing portion (24) by a preset distance in the direction from one side to the other side of the through hole (212h) of the body portion (21), or may be arranged in contact with the bearing portion (24) without being spaced apart from it.

[0144] A second ring insertion groove (216) is formed on the inner surface (212) of the body (21).

[0145] The second ring part (25) is placed and fixed in the second ring part insertion groove (216).

[0146] The second ring insertion groove (216) is arranged (or formed) adjacent to the bearing insertion groove (215).

[0147] Specifically, the second ring insertion groove (216) may be arranged (or formed) spaced apart from the bearing insertion groove (215) by a preset distance from one side to the other side of the through hole (212h) of the body (21), or may be arranged (or formed) in contact with the bearing insertion groove (215) without being spaced apart from it.

[0148] The second ring insertion groove (216) is formed in a groove shape.

[0149] Specifically, the second ring insertion groove (216) has a preset width in one direction (x-axis direction in FIG. 5) and is formed by being sunken from the inner surface (212) of the body portion (21) to a preset depth in a direction orthogonal to the one direction (y-axis direction in FIG. 5).

[0150] The second ring insertion groove (216) is formed in a ring shape. That is, the second ring insertion groove (216) is formed along the circumferential direction on the inner surface (212) of the body (21).

[0151] As described above, the rotation shaft (14) can rotate while being placed in the through hole (212h) of the operating rotation part (20) of the present invention (specifically, the body part (21)). At this time, the rotation shaft (14) can rotate smoothly by the bearing part (24) placed in the body part (21), and the gas stored inside the gas tank part (12) is prevented from leaking to the outside by the first ring part (22) and the flange part (23) placed in the body part (21).

Claims

1. As a moving rotating part mounted on a gas switch, body; A first ring portion arranged in a through hole of the above body portion; and It includes a flange portion arranged in the through hole of the above body portion and arranged adjacent to the first ring portion, A rotating part of a gas switch, in which a rotating shaft is arranged in a through hole of the above body part.

2. In paragraph 1, The first ring portion is inserted into the first ring portion insertion groove formed on the inner surface of the body portion, The above first ring part is an O-ring, the operating rotating part of a gas switch.

3. In paragraph 1, The above flange portion is arranged at a preset distance from the first ring portion in the direction from one side to the other side of the through hole of the body portion, The above flange portion is a movable rotating portion of a gas switch, which is inserted into a flange insertion groove formed on the inner surface of the body portion.

4. In paragraph 1, A bearing part arranged in the through hole of the above body part and arranged adjacent to the flange part; and A gas switch operating rotary part, further comprising a second ring part disposed in the through hole of the body part and disposed adjacent to the bearing part.

5. In paragraph 4, The bearing portion is arranged to be spaced apart from the flange portion by a preset distance in the direction from one side to the other side of the through hole of the body portion, or is arranged to be in contact with the flange portion without being spaced apart from it. The above bearing part is a moving rotating part of a gas switch, which is inserted into a bearing insertion groove formed on the inner surface of the body part.

6. In paragraph 4, The second ring portion is arranged to be spaced apart from the bearing portion by a preset distance in the direction from one side to the other side of the through hole of the body portion, or is arranged to be in contact with the bearing portion without being spaced apart from it. The above second ring part is a C-shaped stop ring, a moving rotating part of a gas switch.

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