A relay capable of suppressing vibration noise

Abstract

The present invention provides a relay capable of suppressing vibration noise, comprising a static contact, a ceramic cover, a yoke plate, a metal shell, a push module, a buffer module, and a drive module; the static contact, ceramic cover, yoke plate, and metal shell are enclosed to form a contact accommodating chamber; the push module comprises a movable contact, an upper push rod, a buffer spring, a lower push rod, a first static iron core, a first movable iron core, and a first spring; the buffer module comprises a guide rod, a second spring, a second movable iron core, and a second static iron core; and the drive module comprises a drive interface, a first coil, a second coil, and a controller. The present invention can reduce noise from within the relay itself, improving NVH performance at the source of noise / vibration, and has a more compact structure, simpler installation, and helps extend the life of the relay.

Description

Technical Field

[0001] The present invention relates to the automotive field, and in particular to a relay capable of suppressing vibration noise. Background Art

[0002] Electric vehicle battery packs typically feature relays to control the circuit's on / off switching. These relays generate noise both when closing and opening. During the relay opening process, the impact between the drive rod assembly and the yoke plate is particularly strong, resulting in a high level of noise. This noise is transmitted to the passenger car, creating knocking sounds and vibrations that degrade the user experience.

[0003] Existing technologies focus on isolating or reducing vibrations of relays or distribution boxes, thereby reducing the vibrations transmitted to the passenger compartment. However, the noise emitted by relays is difficult to isolate through the air, and the vibration reduction pads are not ideal for isolating relay noises. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a relay that can suppress vibration noise and isolate the relay noise through internal structural design.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] The present invention provides a relay capable of suppressing vibration noise, comprising a static contact, a ceramic cover, a yoke iron plate, a metal shell, a pushing module, a buffer module, and a driving module;

[0007] The static contact, the ceramic cover, the yoke iron plate and the metal shell are sealed to form a contact accommodating cavity;

[0008] The pushing module includes: a moving contact, an upper push rod, a buffer spring, a lower push rod, a first static iron core, a first moving iron core, and a first spring;

[0009] The movable contact and the buffer spring are sleeved on the upper push rod, the lower end of the upper push rod is fixedly connected to the lower push rod, and the buffer spring abuts against the movable contact and the lower push rod respectively;

[0010] A flange seat is provided on the upper portion of the lower push rod, an inner hole is provided inside the lower push rod, one side of the inner hole is clearance-matched with the upper push rod, a vent hole connected to the inner hole is provided on the side of the lower push rod, and the outer ring of the push rod at the lower part of the lower push rod passes through the yoke iron plate and the through hole of the first static iron core and is fixedly connected to the first moving iron core;

[0011] The first spring is sleeved on the outer ring of the push rod and abuts against the first static iron core and the first movable iron core respectively. The first static iron core is fixedly connected to the yoke iron plate.

[0012] The buffer module includes: a guide rod, a second spring, a second moving iron core, and a second static iron core;

[0013] The upper end of the guide rod passes through the second movable iron core and the first movable iron core, and is fitted with a small gap in the inner hole of the lower push rod, and the lower end of the guide rod is fixedly coaxially connected to the second static iron core;

[0014] The second spring is sleeved on the guide rod, with two ends respectively abutting against the second moving iron core and the second static iron core;

[0015] The second static iron core is fixedly connected to the metal shell;

[0016] The driving module includes: a driving interface, a first coil, a second coil, and a controller, wherein the first coil and the second coil are sleeved outside the metal shell, so that the first coil and the first static iron core form an electromagnet, and the second coil and the second static iron core form an electromagnet;

[0017] The drive interface is provided with electrical terminals for energizing the first coil and the second coil, and the controller is capable of controlling the magnetic fields of the first coil and the second coil through the electrical terminals;

[0018] When the relay is disconnected from the energized state, the first moving iron core and the second moving iron core make initial contact earlier than the first contact between the flange seat and the yoke iron plate.

[0019] Preferably, the controller controls the power supply timing of the first coil and the second coil so that the first moving iron core strikes the first static iron core and the second moving iron core strikes the second static iron core simultaneously.

[0020] Preferably, when the lower end of the flange seat of the lower push rod contacts the yoke iron plate, the exhaust hole is located above the guide rod.

[0021] Preferably, the buffer module is further provided with a buffer member, and the buffer member is made of elastic or flexible material.

[0022] Preferably, the contact accommodating cavity is filled with an inert gas.

[0023] Preferably, the inner surface of the inner hole and the outer surface of the guide rod are both smooth.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The internal noise reduction of the relay provided by the present invention can improve the NVH performance by addressing the source of noise / vibration. This is more effective than external isolation and does not require external vibration isolation measures, making the structure more compact and the installation easier.

[0026] 2. The relay provided by the present invention can buffer the impact force between components, reduce the acceleration of moving parts and stationary parts during closing and opening, and thus reduce the impact force, which is beneficial to extending the life of the relay while reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0028] Figure 1 Schematic diagram of the external structure of the relay described in the embodiment;

[0029] Figure 2 Schematic diagram of the internal structure of the relay described in the embodiment;

[0030] Figure 3 Schematic diagram of the structure of the lower push rod in the embodiment;

[0031] Figure 4 Schematic diagram of the relay's closing process in the embodiment;

[0032] Figure 5 Schematic diagram of the disconnection process of the relay described in the embodiment.

[0033] The figure shows:

[0034] 1 relay 31 Moving contact 41 First spring 11 shell 32 Push rod 42 Second spring 12 Mounting holes 33 Push rod 43 buffer spring 13 Driver interface 34 The first static iron core 51 Second moving iron core 14 static contact 35 The first moving iron core 52 Buffer 141 First static contact 331 inner hole 53 Second static iron core 142 Second static contact 332 exhaust vents 54 Guide rod 21 Ceramic cover 333 Flange seat 61 First coil 22 Yoke iron plate 33a Flange bottom 62 Second coil 23 Metal shell 33b Putter outer ring DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0037] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components under a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions of "first", "second", etc. in the application are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0038] Example

[0039] This embodiment provides a relay that can suppress vibration noise. Figure 1 As shown, the relay 1 is provided with a housing 11, and the housing 11 is provided with a mounting hole 12, a drive interface 13 and a static contact 14. The internal structure of the relay 1 is as follows Figure 2 As shown, relay 1 also includes a ceramic cover 21, a yoke plate 22, and a metal shell 23, which is welded to the yoke plate 22. The static contact 14, the ceramic cover 21, the yoke plate 22, and the metal shell 23 enclose a contact accommodating cavity 2a. The static contact 14 further includes a first static contact 141 and a static contact 142. Relay 1 also includes a push-up module, a buffer module, and a drive module.

[0040] The push-up module design includes: a movable contact 31, an upper push rod 32, a buffer spring 43, a lower push rod 33, a first stationary iron core 34, a first movable iron core 35, and a first spring 41. The movable contact 31, the upper push rod 32, and the buffer spring 43 are all located within the contact accommodating chamber 2a. The movable contact 31 is sleeved onto the upper push rod 32 and abuts against the upper side of the buffer spring 43. Made of a highly conductive metal or metal alloy, the movable contact 31 contacts and conducts electricity between the first stationary contact 141 and the stationary contact 142. Current can then be conducted from the first stationary contact 141 through the movable contact 31 to the second contact 142. The lower end of the upper push rod 32 is fixedly connected to the lower push rod 33. The upper side of the buffer spring 43 abuts the movable contact 31, while the lower side abuts against the upper side of the lower push rod 33. The elastic force of the buffer spring 43 and the upper end of the upper push rod 32 clamp the movable contact 31. For ease of understanding, the movement state inside the contact accommodating cavity 2a during the closing and opening process of the relay 1 is described as follows: Figure 4 、 5As shown, when the relay 1 is closed, the lower push rod 33 moves upward, further pushing / driving the movable contact 31 upward via the buffer spring 43. When the relay 1 is disconnected, the lower push rod 33 moves downward, further pulling / driving the movable contact 31 downward via the upper push rod 32. Preferably, the contact accommodating chamber 2a is filled with an inert gas (e.g., hydrogen, helium, etc.) to accelerate arc extinguishing.

[0041] As for the specific design of the lower push rod 33 in the push module, Figure 2 、 3 As shown. An inner hole 331 that passes through the lower push rod 33 is provided inside. The upper end of the inner hole 331 is blocked by the upper push rod 32, and the lower end is blocked by the guide rod 54. The inner hole 331 of the lower push rod 33 is constructed as a cylinder, and the guide rod 54 is constructed as a piston. The up and down movement of the lower push rod 33 will be accompanied by changes in the pressure inside the inner hole 331. A vent hole 332 connected to the inner hole 331 is provided on the side of the lower push rod 33. The diameter of the vent hole 332 is much smaller than the diameter of the inner hole 331. When the pressure inside the inner hole 331 changes, gas can be inhaled or discharged through the vent hole 332. A flange seat 333 is also provided on the upper part of the lower push rod 33. The upper surface of the flange seat 333 is in contact with the buffer spring 43, and the lower end 33a of the flange is in contact with the upper surface of the yoke iron plate 22 when the relay 1 is disconnected. The push rod outer ring 33b at the lower portion of the lower push rod 33 passes through the through-holes of the yoke plate 22 and the first stationary iron core 34 and is fixedly connected to the first movable iron core 35, such as by threading or welding. The first stationary iron core 34 is fixedly connected to the yoke plate 22. A first spring 41 is sleeved around the push rod outer ring 33b and abuts against the first stationary iron core 34 and the first movable iron core 35, respectively.

[0042] As for the motion state of the lower push rod 33 in the push module, Figure 4 、 5 As shown, when the relay 1 is energized, the first movable iron core 35 is attracted by the magnetic force of the first stationary iron core 34 and moves upward, thereby compressing the first spring 41 and driving the lower push rod 33 upward. When the relay 1 is disconnected, the first stationary iron core 34 loses its magnetism, and the first movable iron core 35 is driven downward by the rebound force of the first spring 41, thereby driving the lower push rod 33 downward. This causes the volume inside the inner hole 331 to decrease, compressing the gas inside the inner hole 331 and increasing the pressure inside the inner hole 331. It should be understood that when the volume inside the inner hole 331 decreases, the vent hole 332 will exhaust gas at a lower rate. However, the lower push rod 33 moves faster, while the vent hole 332 exhausts gas at a slower rate. The pressure inside the inner hole 331 will increase significantly, which helps to slow the movement of the lower push rod 33, thereby reducing the speed / impact force of the flange lower end 33a hitting the yoke iron plate 22, further reducing noise and vibration.

[0043] Preferably, the inner surface of the inner hole 331 has good smoothness. Preferably, the outer surface of the upper end of the guide rod 54 that is connected to the inner hole 331 is coated with lubricant.

[0044] As for the design of the buffer module, it includes: a guide rod 54, a second spring 42, a second moving iron core 51, and a second static iron core 53. As for the design of the guide rod 54 in the buffer module, Figure 2 As shown. The upper end of the guide rod 54 passes through the second moving iron core 51, the first moving iron core 35 and is inserted into the inner hole 331 of the lower push rod 33, and is matched with the inner hole 331 with a small gap. The lower end of the guide rod 54 is fixedly coaxially connected to the second static iron core 53, and the second static iron core 53 is fixed to the bottom of the metal shell 23. The second spring 42 is sleeved on the guide rod 54, and the two ends of the second spring 42 are respectively in contact with the second moving iron core 51 and the second static iron core 53. As for the motion state of the guide rod 54 in the buffer module, as shown Figure 4 、 5 As shown, when the relay 1 is energized, the second moving iron core 51 is attracted by the magnetic force of the second static iron core 53 and moves downward, the second spring 42 is compressed, and the second moving iron core 51 moves until it contacts the second static iron core 53; when the relay 1 is disconnected, the second static iron core 53 loses its magnetism, and the second moving iron core 51 moves upward driven by the rebound force of the second spring 42.

[0045] Preferably, when the lower end 33a of the flange contacts the yoke iron plate 22, the exhaust hole 332 is located above the guide rod 54 and will not be blocked by the guide rod 54, so that after the relay 1 is disconnected, the exhaust hole 332 can continue to discharge the gas inside the inner hole 331 until the pressure inside the inner hole 331 is equal to the pressure of the contact accommodating chamber 2a.

[0046] Preferably, the buffer module is provided with a buffer member 52, which is located between the second movable iron core 51 and the first movable iron core 35. The buffer member 52 can be made of an elastic or flexible material, such as silicone, foamed polypropylene, etc. The buffer member 52 can be deformed or compressed during the impact process, thereby providing a buffering and noise reduction effect.

[0047] The drive module design includes: a drive interface 13, a first coil 61, a second coil 62, and a controller. The first coil 61 and the second coil 62 are sheathed outside the metal shell 23. The first coil 61 and the first static iron core 34 form an electromagnet, while the second coil 62 and the second static iron core 53 form an electromagnet. The drive interface 13 is provided with electrical terminals for energizing the first coil 61 and the second coil 62. The power supply can be controlled by the controller, which can control the on / off state of the relay 1. Specifically, the drive interface 13 can control the magnetic fields of the first coil 61 and the second coil 62, further controlling the movement of the first moving iron core 35 and the second moving iron core 51: By inputting a 12V voltage to the first coil 61 through the drive interface 13, the first static iron core 34 becomes magnetic; by disconnecting the power supply to the first coil 61, the first static iron core 34 loses its magnetism; by inputting a 12V voltage to the second coil 62 through the drive interface 13, the second static iron core 53 becomes magnetic; by disconnecting the power supply to the second coil 62, the second static iron core 53 loses its magnetism.

[0048] The following is a detailed description of the closing process of relay 1. Figure 4 The controller supplies power to the first coil 61 and the second coil 62 respectively. The first static iron core 34 and the second static iron core 53 are magnetic. The first static iron core 34 attracts the first moving iron core 35 to move upward (i.e. Figure 4 The second static iron core 53 attracts the second movable iron core 51 to move downward (ie Figure 4 The first movable iron core 35 moves upward (in the opposite direction to the direction indicated by V1) until its lower surface contacts the upper surface of the second static iron core 53, the second movable iron core 51 becomes stationary again, and the second spring 42 is in a compressed state. The first movable iron core 35 moves upward, driving the lower push rod 33 connected to it to move upward synchronously. The lower push rod 33 further pushes the buffer spring 43 upward, and the buffer spring 43 pushes the movable contact 31 upward; until the upper surface of the first movable iron core 35 contacts the lower surface of the first static iron core 34, the first spring 41 and the buffer spring 43 are in a compressed state. Under the elastic force of the buffer spring 43, the movable contact 31 is pressure-contacted with the static contact 14, and the movable contact 31 electrically connects the first static contact 141 and the second static contact 142. At this point, the relay 1 is in the attracted state.

[0049] During the energizing process of the relay 1, when the first moving iron core 35 moves upward and stops, the first moving iron core 35 will collide with the first static iron core 34 and the yoke iron plate 22, and the collision process may generate vibration and noise; the greater the speed of the first moving iron core 35 at the moment before the collision, the greater the collision energy, and the greater the vibration and noise generated.

[0050] This embodiment can achieve a noise reduction effect during the energizing process of the relay 1. The specific principle is as follows. First, when the lower push rod 33 moves upward rapidly, the volume within the inner hole 331 increases rapidly, and the pressure within the inner hole 331 decreases. The negative pressure within the inner hole 331 exerts a downward pulling force on the lower push rod 33. The closer the first movable iron core 35 is to the first stationary iron core 34, the greater the downward pulling force exerted by the negative pressure on the lower push rod 33. The pulling force is opposite to the direction of movement of the lower push rod 33, thereby decelerating the lower push rod 33, which helps to reduce the speed of the lower push rod 33 and, in turn, the speed of the first movable iron core 35 immediately before it strikes the first stationary iron core 34, thereby reducing vibration and noise during the energizing process. The relay 1 remains in the energized state, and the gas within the contact accommodating chamber 2a flows into the inner hole 331 through the vent 332. The air pressure within the inner hole 331 gradually balances with the air pressure within the contact accommodating chamber 2a.

[0051] In addition, by controlling the power supply timing of the first coil 61 and the second coil 62, the controller can achieve the simultaneous impact of the first moving iron core 35 hitting the first static iron core 34 and the impact of the second moving iron core 51 on the second static iron core 53. The impulse directions of the first moving iron core 35 and the second moving iron core 51 are opposite. The vibration waveform generated by the first moving iron core 35 hitting the first static iron core 34 and the vibration waveform generated by the second moving iron core 51 hitting the second static iron core 53 cancel each other out. The vibration amplitude / acceleration of the relay 1 is weakened, which is beneficial to reducing the movement and noise of the attraction process.

[0052] The disconnection process of relay 1 is described in detail as follows: Figure 2 、 5 As shown. When the relay 1 is in the disconnected state, the distance between the moving contact 31 and the static contact 14 is H1; during the contact disconnection process, the controller cuts off the power to the first coil 61 and the second coil 62, which causes the first static iron core 34 and the second static iron core 53 to lose their magnetism. The first moving iron core 35 moves downward under the elastic force of the first spring 41 (i.e. Figure 5 V2 direction as shown), the second movable iron core 51 moves upward under the elastic force of the second spring 42 (ie Figure 5(The direction opposite to the V2 direction shown in the figure). When the first movable iron core 35 moves downward, it drives the lower push rod 33 downward. The lower push rod 33 further drives the upper push rod 32 connected to it downward, and the upper push rod 32 drives the movable contact 31 downward. When the movable contact 31 moves to a distance H2 from the static contact 14 (H2 is less than H1), the downward-moving first movable iron core 35 collides with the buffer 52 above the upward-moving second movable iron core 51. At this time, the first movable iron core 35 pushes the second movable iron core 51 to continue moving downward. When the first movable iron core 35 collides with the buffer 52, the downward movement speed of the first movable iron core 35 and the lower push rod 33 decreases. At the same time, the buffer 52 is squeezed and deformed, absorbing part of the impact energy. The lower push rod 33 continues to move downward. When the distance between the movable contact 31 and the static contact 14 is H1, the lower end 33a of the flange of the lower push rod 33 strikes the upper surface of the yoke iron plate 22, generating vibration and noise.

[0053] This embodiment can achieve a noise reduction effect during the disconnection process of the relay 1. The specific principles are as follows: First, to address the noise generated by the lower end 33a of the flange hitting the yoke plate 22, when the relay 1 is disconnected from the energized state, the first contact between the first movable iron core 35 and the second movable iron core 51 occurs earlier than the first contact between the flange seat 333 and the yoke plate 22. As a result, the design of the second movable iron core 51 and the buffer member 52 in the upward motion state can buffer and decelerate the lower push rod 33, reducing the vibration and noise caused by the impact on the yoke plate 22. In addition, when the lower push rod 33 moves downward, the volume in the inner hole 331 decreases rapidly, the gas in the inner hole 331 is compressed, and the pressure in the inner hole 331 increases rapidly. The positive pressure in the inner hole 331 generates an upward thrust on the lower push rod 33. The closer the flange lower end 33a of the lower push rod 33 is to the yoke iron plate 22, the greater the upward thrust generated by the positive pressure on the lower push rod 33. The thrust is opposite to the movement direction of the lower push rod 33, thereby decelerating the lower push rod 33, which is beneficial to reducing the speed of the lower push rod 33 moving downward, and then reducing the speed of the lower push rod 33 at the moment before hitting the yoke iron plate 22, thereby reducing the vibration and noise of the disconnection process. The second moving iron core 51 and the buffer member 52 decelerate the downward movement of the moving contact 31 and the lower push rod 33. At the same time, the thrust under the action of the air pressure in the inner hole 331 continues to decelerate the lower push rod 33. Under the combined effect of the above, the speed of the lower push rod 33 is reduced at the moment before it hits the yoke iron plate 22, thereby reducing the vibration and noise of the disconnection process.

[0054] It should be understood that in the initial stage of separation of the moving contact 31 and the static contact 14, the thrust of the gas in the inner hole 331 on the lower push rod 33 is small, and the deceleration effect is weak, which will not affect the breaking ability of the contact; the second moving iron core 51 and the buffer 52 will only buffer or decelerate the first moving iron core 35 and the lower push rod 33 when the moving contact 31 and the static contact 14 are completely separated to a distance of H2; the participation of the second moving iron core 51 and the buffer 52 in deceleration / buffering will not affect the breaking ability of the contact.

[0055] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this invention.

Claims

1. A relay capable of suppressing vibration noise, characterized in that: It includes static contact, ceramic cover, yoke iron plate, metal shell, push module, buffer module and drive module; The static contact, the ceramic cover, the yoke iron plate and the metal shell are sealed to form a contact accommodating cavity; The pushing module includes: a moving contact, an upper push rod, a buffer spring, a lower push rod, a first static iron core, a first moving iron core, and a first spring; The movable contact and the buffer spring are sleeved on the upper push rod, the lower end of the upper push rod is fixedly connected to the lower push rod, and the buffer spring abuts against the movable contact and the lower push rod respectively; A flange seat is provided on the upper portion of the lower push rod, an inner hole is provided inside the lower push rod, one side of the inner hole is clearance-matched with the upper push rod, a vent hole connected to the inner hole is provided on the side of the lower push rod, and the outer ring of the push rod at the lower part of the lower push rod passes through the yoke iron plate and the through hole of the first static iron core and is fixedly connected to the first moving iron core; The first spring is sleeved on the outer ring of the push rod and abuts against the first static iron core and the first movable iron core respectively. The first static iron core is fixedly connected to the yoke iron plate. The buffer module includes: a guide rod, a second spring, a second moving iron core, and a second static iron core; The upper end of the guide rod passes through the second movable iron core and the first movable iron core, and fits with a small gap in the inner hole of the lower push rod, and the lower end of the guide rod is coaxially fixedly connected to the second static iron core; The second spring is sleeved on the guide rod, with two ends respectively abutting against the second moving iron core and the second static iron core; The second static iron core is fixedly connected to the metal shell; The driving module includes: a driving interface, a first coil, a second coil, and a controller, wherein the first coil and the second coil are sleeved outside the metal shell, so that the first coil and the first static iron core form an electromagnet, and the second coil and the second static iron core form an electromagnet; The drive interface is provided with electrical terminals for energizing the first coil and the second coil, and the controller is capable of controlling the magnetic fields of the first coil and the second coil through the electrical terminals; When the relay is disconnected from the energized state, the first moving iron core and the second moving iron core make initial contact earlier than the first contact between the flange seat and the yoke iron plate.

2. The relay capable of suppressing vibration noise according to claim 1, characterized in that: The controller controls the power supply timing of the first coil and the second coil so that the first moving iron core strikes the first static iron core and the second moving iron core strikes the second static iron core simultaneously.

3. The relay capable of suppressing vibration noise according to claim 1, characterized in that: When the lower end of the flange seat of the lower push rod contacts the yoke iron plate, the vent hole is located above the guide rod.

4. The relay capable of suppressing vibration noise according to claim 1, wherein: The buffer module is further provided with a buffer member, and the buffer member is made of elastic or flexible material.

5. The relay capable of suppressing vibration noise according to claim 1, characterized in that: The contact accommodating cavity is filled with inert gas.

6. The relay capable of suppressing vibration noise according to claim 1, characterized in that: The inner surface of the inner hole and the outer surface of the guide rod are both smooth.

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