Aluminum electrolytic capacitor with safety switch structure

Abstract

The utility model relates to an aluminum electrolytic capacitor with a safety switch structure, which belongs to the technical field of capacitors and comprises a safety box, a main power supply, a first lead, a box cover, heat dissipation holes, a third lead, an aluminum electrolytic capacitor body and a second lead. The box cover is fixedly installed on the fuse box through bolts, and heat dissipation holes which are used for dissipating heat flow in the fuse box and are evenly distributed are formed in one side of the box cover. The aluminum electrolytic capacitor with the safety switch structure can be suitable for mounting fuses with different lengths, the fuses can be automatically clamped through the convenient mounting mechanism only by inserting the two ends of the fuses into the device respectively, meanwhile, once one fuse is fused, a main power supply does not need to be switched off for replacement, and the cost is reduced. And the fuse can be replaced only by dismounting the fused fuse, so that the convenience of installing the fuse in the existing capacitor is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor with a safety switch structure. Background Art

[0002] Capacitor, as the name implies, is a container for electricity, a device that holds electric charge. Aluminum electrolytic capacitor is made of an aluminum cylinder as the negative electrode, filled with liquid electrolyte, and a curved aluminum strip inserted as the positive electrode. It also needs to be treated with DC voltage to form an oxide film on the positive electrode as a medium. It is characterized by large capacity, but large leakage, poor stability, positive and negative polarity, and is suitable for power supply filtering or low-frequency circuits.

[0003] In actual use, if a capacitor encounters a large current that exceeds its own load, it is easy to damage electrical components and related equipment. To avoid this phenomenon, a fuse is installed in the connector. When the current is overloaded, the fuse itself melts and cuts off the current, thereby protecting the circuit safety.

[0004] In real life, a fuse is usually installed on the main circuit to protect the main circuit. At this time, a fuse needs to be installed between each electrical appliance and the power supply. This method can better protect each electrical appliance. If this method is used to install the fuse, a fuse box needs to be installed.

[0005] Existing aluminum electrolytic capacitors with fuse switch structures are generally improved to avoid the problem of capacitor damage caused by a sharp increase in leakage current when the oxide film medium is broken down, which endangers the surrounding electronic components. For example, a chip capacitor with a fuse disclosed in the authorized Chinese patent CN205303193U can be used in combination with structures such as a positive lead sheet, an anode lead wire, a polymer layer, a graphite layer, a silver paste layer, a negative lead sheet, an anode block, a casing and a fuse to avoid the risk of capacitor damage caused by a sharp increase in leakage current when the oxide film medium is broken down, which endangers the surrounding electronic components. It has a simple structure, high safety and reliability, and can prevent the expansion of faults.

[0006] However, it is inconvenient to install fuses in the fuse box of the capacitor in the above cited document, and different fuses have different lengths, so a matching fuse box is required when selecting a fuse box, which results in the convenience of installing fuses in the existing capacitor to be improved. Utility Model Content

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the utility model provides an aluminum electrolytic capacitor with a fuse switch structure, which has the advantages of effectively improving the convenience of installing fuses on existing capacitors, and solves the problem of poor convenience when installing fuses on existing capacitors.

[0009] (II) Technical solution

[0010] In order to achieve the above-mentioned purpose of effectively improving the convenience of installing fuses on existing capacitors, the utility model provides the following technical solutions: an aluminum electrolytic capacitor with a fuse switch structure, comprising a fuse box, a main power supply, a No. 1 wire, a box cover, a heat dissipation hole, a No. 3 wire, an aluminum electrolytic capacitor body and a No. 2 wire, the main power supply is electrically connected to the fuse box through the No. 1 wire, the box cover is fixedly mounted on the fuse box by bolts, and one side of the box cover is provided with heat dissipation holes for dissipating heat flow in the fuse box and evenly distributed;

[0011] A convenient installation mechanism for conveniently replacing fuses is installed on the inner side of the fuse box, the convenient installation mechanism is connected to the end of the No. 1 wire away from the main power supply by a bidirectional electrical signal, one side of the convenient installation mechanism is connected to the No. 2 wire by a bidirectional electrical signal, one end of the No. 3 wire is connected to one side of the convenient installation mechanism by a bidirectional electrical signal, and the other end passes through the fuse box and extends to the aluminum electrolytic capacitor body and is connected to the aluminum electrolytic capacitor body by a bidirectional electrical signal;

[0012] The convenient installation mechanism includes a socket fixedly installed on the inner wall of the fuse box and connected to the No. 1 wire for bidirectional electrical signals, the socket is connected to a plug adapted to the socket and a No. 2 wire connected to one side of the plug, an installation limit plate is fixedly installed on the inner wall of the fuse box, a fuse component is connected in the installation limit plate, the fuse component is connected to the plug through the No. 2 wire, a movable connection component is connected to one side of the fuse component, an elastic guide component is installed in the movable connection component, a pulling component and a guide movable component installed outside the pulling component are installed on one side of the movable connection component; the pulling component pulls the movable connection component to move outside the elastic guide component under the guidance of the guide movable component.

[0013] Furthermore, the fuse assembly includes a No. 1 conductive sheet, a fuse body and a No. 2 conductive sheet; one end of the No. 1 conductive sheet is fixedly connected to one side of the No. 1 conductive sheet, and the other end is fixedly connected to one side of the No. 2 conductive sheet, the No. 1 conductive sheet is connected to the plug adapted to the socket through the No. 2 conductive wire, and the No. 2 conductive sheet is connected to the aluminum electrolytic capacitor body adapted thereto through the No. 3 conductive wire connected to the mobile connection assembly.

[0014] Furthermore, the movable connection component includes a movable block and a wiring terminal; the outer side of the movable block is slidably connected to the inner side of the fuse box; a mounting groove for the No. 2 conductive sheet to be fitted and snapped into is provided on the side of the movable block close to the mounting limit plate; one end of the wiring terminal passes through the movable block and extends into the mounting groove to be bidirectionally connected to the No. 2 conductive sheet for electrical signals, and the other end is fixedly connected to one end of the No. 3 wire.

[0015] Furthermore, the elastic guide assembly includes a mounting seat, a sliding rod and a return spring; the opposite sides of the two mounting seats are respectively fixedly mounted on one side of the moving block and the inner wall of the fuse box by bolts, and the two mounting seats are distributed in a mirror-symmetrical manner, the two ends of the sliding rod are respectively fixedly connected to the opposite side of the mounting seat, the inner side of the return spring is sleeved on the outer side of the sliding rod and is located on the right side of the moving block, and the inner side of the moving block and the outer side of the sliding rod are in close sliding contact.

[0016] Furthermore, the convenient installation mechanism also includes two auxiliary adjustment blocks respectively fixedly connected to the two sides of the moving block; and a moving groove for the auxiliary adjustment blocks to fit and slide is opened on the inner side wall of the fuse box.

[0017] Furthermore, the pulling assembly includes a pull rod and a pull handle; one end of the pull rod is fixedly mounted on one side of the moving block by a bolt, and the other end sequentially penetrates the guide moving assembly and the fuse box and extends to one side of the pull handle to be fixedly connected to the pull handle;

[0018] The pull handle pulls the pull rod to move, so as to drive the moving block to move outside the sliding rod and elastically contract the return spring.

[0019] Furthermore, the guide movement assembly includes a sliding support and a guide ring; one side of the sliding support is fixedly mounted on the inner wall of the fuse box by bolts, the outer side of the guide ring passes through the sliding support and is fixedly connected to the inside of the sliding support, and the inner side of the guide ring slides in contact with the outer side of the pull rod.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the utility model provides an aluminum electrolytic capacitor with a safety switch structure, which has the following beneficial effects:

[0022] The aluminum electrolytic capacitor with a fuse switch structure can be used to install fuses of different lengths through the mutual cooperation of the main power supply, No. 1 wire, the convenient installation mechanism, the box cover, the heat dissipation hole, the No. 3 wire, the aluminum electrolytic capacitor body and the No. 2 wire on the fuse box, and is simple and convenient to install and replace. It only needs to insert the two ends of the fuse into the device respectively, and the fuse will be automatically clamped by the convenient installation mechanism. At the same time, once one of the fuses is blown, it is not necessary to turn off the main power supply for replacement, and it only needs to remove the blown fuse for replacement, thereby effectively improving the convenience of installing fuses on existing capacitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle A part;

[0025] Figure 3 for Figure 1 A partial enlarged schematic diagram of the middle B part;

[0026] Figure 4 for Figure 3 A three-dimensional schematic diagram of the middle guide ring connection structure.

[0027] In the figure: 1 fuse box, 2 main power supply, 3 No. 1 wire, 400 convenient installation mechanism, 401 socket, 402 plug, 403 installation limit plate, 4041 No. 1 conductive sheet, 4042 fuse body, 4043 No. 2 conductive sheet, 4051 moving block, 4052 terminal, 406 mounting slot, 4071 mounting seat, 4072 sliding rod, 4073 reset spring, 408 auxiliary adjustment block, 409 moving slot, 4101 pull rod, 4102 pull handle, 4111 sliding support, 4112 guide ring, 5 box cover, 6 heat dissipation hole, 7 No. 3 wire, 8 aluminum electrolytic capacitor body, 9 No. 2 wire. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-4The utility model provides a technical solution: an aluminum electrolytic capacitor with a safety switch structure, comprising a fuse box 1, a main power supply 2, a No. 1 wire 3, a box cover 5, a heat dissipation hole 6, a No. 3 wire 7, an aluminum electrolytic capacitor body 8 and a No. 2 wire 9, the main power supply 2 is electrically connected to the fuse box 1 through the No. 1 wire 3, the box cover 5 is fixedly installed on the fuse box 1 by bolts, and one side of the box cover 5 is provided with a heat dissipation hole 6 for dissipating the heat flow in the fuse box 1 and evenly distributed; a convenient installation mechanism 400 for conveniently replacing fuses is installed on the inner side of the fuse box 1, the convenient installation mechanism 400 is bidirectionally connected to the end of the No. 1 wire 3 away from the main power supply 2, one side of the convenient installation mechanism 400 is bidirectionally connected to the No. 2 wire 9, one end of the No. 3 wire 7 is bidirectionally connected to one side of the convenient installation mechanism 400, and the other end passes through the fuse box 1 and extends to the aluminum electrolytic capacitor body 8 and is bidirectionally connected to the aluminum electrolytic capacitor body 8;

[0030] Through the mutual cooperation among the main power supply 2, No. 1 wire 3, convenient installation mechanism 400, box cover 5, heat dissipation hole 6, No. 3 wire 7, aluminum electrolytic capacitor body 8 and No. 2 wire 9 on the fuse box 1, it is suitable for installing fuses of different lengths, and the installation and replacement are simple and convenient. It only needs to insert the two ends of the fuse into the device respectively, and the convenient installation mechanism 400 will automatically clamp the fuse. At the same time, once one of the fuses is blown, it is not necessary to turn off the main power supply 2 for replacement. It only needs to remove the blown fuse for replacement, thereby effectively improving the convenience of installing fuses on existing capacitors.

[0031] In this embodiment, the convenient installation mechanism 400 is a structure for conveniently replacing a fuse.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the convenient installation mechanism 400 includes a socket 401 fixedly mounted on the inner wall of the fuse box 1 and connected to the bidirectional electrical signal of the No. 1 wire 3, the socket 401 is connected to a plug 402 adapted to the socket 401 and a No. 2 wire 9 connected to one side of the plug 402, an installation limit plate 403 is fixedly mounted on the inner wall of the fuse box 1, a fuse component is connected inside the installation limit plate 403, the fuse component is connected to the plug 402 through the No. 2 wire 9, a movable connection component is connected to one side of the fuse component, an elastic guide component is installed inside the movable connection component, a pulling component and a guide movable component installed outside the pulling component are installed on one side of the movable connection component; the pulling component pulls the movable connection component to move outside the elastic guide component under the guidance of the guide movable component.

[0033] It should be noted that the insurance component includes a No. 1 conductive sheet 4041, a fuse body 4042 and a No. 2 conductive sheet 4043; one end of the No. 1 conductive sheet 4041 is fixedly connected to one side of the No. 1 conductive sheet 4041, and the other end is fixedly connected to one side of the No. 2 conductive sheet 4043. The No. 1 conductive sheet 4041 is connected to a plug 402 adapted to the socket 401 through a No. 2 wire 9, and the No. 2 conductive sheet 4043 is connected to an aluminum electrolytic capacitor body 8 adapted thereto through a No. 3 wire 7 connected to the mobile connection component, so as to ensure that the No. 1 conductive sheet 4041 will automatically blow when the current in the circuit is overloaded.

[0034] It can be understood that the mobile connection component includes a mobile block 4051 and a wiring terminal 4052; the outer side of the mobile block 4051 is slidably connected to the inner side of the fuse box 1; a mounting groove 406 for the No. 2 conductive sheet 4043 to fit and snap into is provided on one side of the mobile block 4051 close to the mounting limit plate 403; one end of the wiring terminal 4052 passes through the mobile block 4051 and extends into the mounting groove 406 to be connected to the No. 2 conductive sheet 4043 for bidirectional electrical signal connection, and the other end is fixedly connected to one end of the No. 3 wire 7 to ensure the flow of current.

[0035] In addition, the elastic guide assembly includes a mounting seat 4071, a sliding rod 4072 and a return spring 4073; the opposite sides of the two mounting seats 4071 are respectively fixedly installed on one side of the moving block 4051 and the inner wall of the fuse box 1 by bolts, and the two mounting seats 4071 are distributed in a mirror-symmetrical manner, and the two ends of the sliding rod 4072 are respectively fixedly connected to the opposite side of the mounting seat 4071, and the inner side of the return spring 4073 is sleeved on the outer side of the sliding rod 4072 and is located on the right side of the moving block 4051. The inner side of the moving block 4051 and the outer side of the sliding rod 4072 are fitted and slidable, so as to be able to stably drive the moving block 4051 to move on the outer side of the sliding rod 4072.

[0036] In this embodiment, the convenient installation mechanism 400 also includes two auxiliary adjustment blocks 408 respectively fixedly connected to the two sides of the moving block 4051; a moving groove 409 for the auxiliary adjustment block 408 to slide and fit is opened on the inner wall of the fuse box 1, in order to further improve the stability of the moving block 4051 when moving.

[0037] It should also be noted that the pulling assembly includes a pull rod 4101 and a pull handle 4102; one end of the pull rod 4101 is fixedly mounted on one side of the moving block 4051 by means of bolts, and the other end sequentially penetrates the guide moving assembly and the fuse box 1 and extends to one side of the pull handle 4102 and is fixedly connected to the pull handle 4102;

[0038] The pull handle 4102 pulls the pull rod 4101 to move, so as to drive the moving block 4051 to move outside the sliding rod 4072 and elastically contract the return spring 4073, so as to stably pull the moving block 4051 to move.

[0039] It should be further explained that the guide moving assembly includes a sliding support 4111 and a guide ring 4112; one side of the sliding support 4111 is fixedly installed on the inner wall of the fuse box 1 by bolts, the outer side of the guide ring 4112 passes through the sliding support 4111 and is fixedly connected to the inside of the sliding support 4111, and the inner side of the guide ring 4112 fits and slides with the outer side of the pull rod 4101 in order to improve the stability of the pull rod 4101 when moving.

[0040] The working principle of the above embodiment is:

[0041] During installation, first, electrically connect the socket 401 to the main power supply 2 through the No. 1 wire 3, and then extend the No. 3 wire 7 connected to the aluminum electrolytic capacitor body 8 through the fuse box 1 and electrically connect it to the terminal 4052. Then, hold the pull handle 4102 and pull it in the direction away from the installation limit plate 403. Under the sliding connection between the pull rod 4101 and the guide ring 4112 and the sliding connection between the auxiliary adjustment block 408 and the moving groove 409, the moving block 4051 is driven to move on the outside of the sliding rod 4072, and the reset spring 4073 is continuously squeezed under the thrust generated by the moving block 4051. Then, the No. 2 conductive sheet 4043 on the No. 1 conductive sheet 4041 is inserted into the installation groove 406. Then, slowly release the pull handle 4102. When the reset spring 4073 elastically recovers, Under the action of force, the moving block 4051 will be driven to move towards the direction close to the installation limit plate 403, and finally the fuse body 4042 fixed at the other end of the No. 1 conductive sheet 4041 will extend into the installation limit plate 403 and be pressed. After all the No. 1 conductive sheets 4041 are installed, all the plugs 402 are inserted into the socket 401. At this time, the No. 1 conductive sheet 4041 will conduct the entire circuit. Finally, the box cover 5 can be installed on the fuse box 1 by bolts. When one of the No. 1 conductive sheets 4041 is blown, the box cover 5 can be removed, and then the plug 402 corresponding to the blown No. 1 conductive sheet 4041 can be unplugged from the socket 401. According to the above principle, the handle 4102 can be pulled in the opposite direction to remove the No. 1 conductive sheet 4041 and replace it with a new No. 1 conductive sheet 4041 to complete the replacement work.

[0042] Compared with the prior art: the aluminum electrolytic capacitor with a fuse switch structure can be used to install fuses of different lengths through the mutual cooperation of the main power supply 2, the No. 1 wire 3, the convenient installation mechanism 400, the box cover 5, the heat dissipation hole 6, the No. 3 wire 7, the aluminum electrolytic capacitor body 8 and the No. 2 wire 9 on the fuse box 1, and the installation and replacement are simple and convenient. It only needs to insert the two ends of the fuse into the device respectively, and the fuse will be automatically clamped by the convenient installation mechanism 400. At the same time, once one of the fuses is blown, it is not necessary to turn off the main power supply 2 for replacement. It is only necessary to remove the blown fuse for replacement, thereby effectively improving the convenience of installing fuses on existing capacitors and solving the problem of poor convenience when installing fuses on existing capacitors.

[0043] The electrical components appearing in the text are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device that controls a computer, etc., and the existing publicly available power connection technology and power supply are also common knowledge in the field, so this application will not go into details.

[0044] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. An aluminum electrolytic capacitor with a safety switch structure, comprising a fuse box (1), a main power supply (2), a No. 1 wire (3), a box cover (5), a heat dissipation hole (6), a No. 3 wire (7), an aluminum electrolytic capacitor body (8) and a No. 2 wire (9), wherein the main power supply (2) is electrically connected to the fuse box (1) via the No. 1 wire (3), the box cover (5) is fixedly mounted on the fuse box (1) via bolts, and a heat dissipation hole (6) is provided on one side of the box cover (5) for dissipating heat flow in the fuse box (1) and is evenly distributed; Features: A convenient installation mechanism (400) for conveniently replacing a fuse is installed on the inner side of the fuse box (1); the convenient installation mechanism (400) is connected to the end of the No. 1 wire (3) away from the main power supply (2) by a bidirectional electrical signal; one side of the convenient installation mechanism (400) is connected to the No. 2 wire (9) by a bidirectional electrical signal; one end of the No. 3 wire (7) is connected to one side of the convenient installation mechanism (400) by a bidirectional electrical signal; the other end of the No. 3 wire (7) passes through the fuse box (1) and extends to the aluminum electrolytic capacitor body (8) and is connected to the aluminum electrolytic capacitor body (8) by a bidirectional electrical signal; The convenient installation mechanism (400) comprises a socket (401) fixedly mounted on the inner wall of the fuse box (1) and connected to the first wire (3) for bidirectional electrical signal connection; the socket (401) is connected to a plug (402) adapted to the socket (401) and a second wire (9) connected to one side of the plug (402); a mounting limit plate (403) is fixedly mounted on the inner wall of the fuse box (1); a fuse component is connected inside the mounting limit plate (403); the fuse component is connected to the plug (402) via the second wire (9); a movable connection component is connected to one side of the fuse component; an elastic guide component is installed inside the movable connection component; a pulling component and a guide movable component installed outside the pulling component are installed on one side of the movable connection component; the pulling component pulls the movable connection component to move outside the elastic guide component under the guidance of the guide movable component.

2. The aluminum electrolytic capacitor with a safety switch structure according to claim 1, characterized in that: The fuse assembly comprises a No. 1 conductive sheet (4041), a fuse body (4042) and a No. 2 conductive sheet (4043); one end of the No. 1 conductive sheet (4041) is fixedly connected to one side of the No. 1 conductive sheet (4041), and the other end is fixedly connected to one side of the No. 2 conductive sheet (4043); the No. 1 conductive sheet (4041) is connected to the plug (402) adapted to the socket (401) through the No. 2 conductive sheet (9); the No. 2 conductive sheet (4043) is connected to the aluminum electrolytic capacitor body (8) adapted thereto through the No. 3 conductive sheet (7) connected to the mobile connection assembly.

3. The aluminum electrolytic capacitor with a safety switch structure according to claim 2, characterized in that: The movable connection component comprises a movable block (4051) and a connecting terminal (4052); the outer side of the movable block (4051) is slidably connected to the inner side of the fuse box (1); a mounting groove (406) for the second conductive sheet (4043) to be fitted and engaged is provided on a side of the movable block (4051) close to the mounting limit plate (403); one end of the connecting terminal (4052) passes through the movable block (4051) and extends into the mounting groove (406) to be bidirectionally connected to the second conductive sheet (4043) via electrical signals, and the other end is fixedly connected to one end of the third wire (7).

4. The aluminum electrolytic capacitor with a safety switch structure according to claim 3, characterized in that: The elastic guide assembly comprises a mounting seat (4071), a sliding rod (4072) and a return spring (4073); the opposite sides of the two mounting seats (4071) are respectively fixedly mounted on one side of the moving block (4051) and the inner wall of the fuse box (1) by bolts, and the two mounting seats (4071) are distributed in a mirror-symmetrical manner, the two ends of the sliding rod (4072) are respectively fixedly connected to the opposite side of the mounting seat (4071), the inner side of the return spring (4073) is sleeved on the outer side of the sliding rod (4072) and is located on the right side of the moving block (4051), and the inner side of the moving block (4051) and the outer side of the sliding rod (4072) are fitted and slidable.

5. The aluminum electrolytic capacitor with a safety switch structure according to claim 3, characterized in that: The convenient installation mechanism (400) further comprises two auxiliary adjustment blocks (408) respectively fixedly connected to the two sides of the moving block (4051); and a moving groove (409) for the auxiliary adjustment block (408) to slide in contact with is provided on the inner side wall of the fuse box (1).

6. The aluminum electrolytic capacitor with a safety switch structure according to claim 4, characterized in that: The pulling assembly comprises a pulling rod (4101) and a pulling handle (4102); one end of the pulling rod (4101) is fixedly mounted on one side of the moving block (4051) by means of bolts, and the other end passes through the guiding moving assembly and the fuse box (1) in sequence and extends to one side of the pulling handle (4102) to be fixedly connected to the pulling handle (4102); The pull handle (4102) pulls the pull rod (4101) to move, thereby driving the moving block (4051) to move outside the sliding rod (4072) and causing the return spring (4073) to elastically contract.

7. The aluminum electrolytic capacitor with a safety switch structure according to claim 6, characterized in that: The guide moving assembly comprises a sliding support (4111) and a guide ring (4112); one side of the sliding support (4111) is fixedly mounted on the inner wall of the fuse box (1) by means of bolts, the outer side of the guide ring (4112) passes through the sliding support (4111) and is fixedly connected to the inside of the sliding support (4111), and the inner side of the guide ring (4112) slides in close contact with the outer side of the pull rod (4101).

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