CN116053083A

CN116053083A - Low noise relay

Info

Publication number: CN116053083A
Application number: CN202310332878.4A
Authority: CN
Inventors: 郭顺可; 杜绣娟; 杜德进; 王亚炜; 胡继超; 马振宇
Original assignee: Zhejiang Innuovo New Energy Technology Co Ltd
Current assignee: Zhejiang Innuovo New Energy Technology Co Ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-05-02
Anticipated expiration: 2043-03-31
Also published as: CN116053083B

Abstract

The invention relates to a high-voltage direct-current relay, in particular to a low-noise relay. The low-noise relay comprises a push rod and a yoke plate, wherein the yoke plate is provided with a yoke plate through hole which penetrates through from top to bottom so as to allow the push rod to pass through, the part of the push rod, which is positioned on the lower side of the yoke plate, is fixed with a movable iron core, the part of the push rod, which is positioned on the upper side of the yoke plate, is linked with a movable contact, the movable iron core or the push rod is provided with a lower noise reduction piece, the lower noise reduction piece is close to the yoke plate and is positioned on the lower side of the yoke plate, and the lower noise reduction piece is provided with a first elastic bulge which extends upwards; when the movable iron core drives the pushing rod to move upwards so as to enable the movable contact and the fixed contact to be in attraction contact, the lower noise reduction piece rises so that the first elastic bulge is adjacent to the yoke iron plate, and the lower noise reduction piece is elastically deformed. The invention has the advantages of reducing noise during the attraction of the dynamic contact and the static contact and not negatively affecting the performance of the relay.

Description

Low noise relay

Technical Field

The invention relates to a high-voltage direct-current relay, in particular to a low-noise relay.

Background

The high-voltage direct-current relay generally comprises a magnetic circuit system, a contact system, a pushing part and an installation leading-out part, wherein the magnetic circuit system mainly converts electric energy into mechanical energy to drive the pushing part to move, so that the contact system is contacted, and the switch function is achieved. When the pushing part moves, the movable iron core of the pushing part moves along the axial line of the pushing rod, and the situation of collision contact with the yoke plate exists, so that noise can be generated when the relay is used, the noise generally reaches 55 to 75 decibels, and the noise level is higher.

The chinese patent with application number 201110310347.2 discloses an electromagnetic switch that falls, including moving iron core and quiet iron core, move and be equipped with reset spring between iron core and the quiet iron core, move the iron core and fixed with the push rod, move still to be equipped with the bolster between iron core and the quiet iron core, move iron core terminal surface and quiet iron core terminal surface and be equipped with the ladder structure that is used for the location bolster tip. The above scheme has the following defects: the buffer piece is arranged at the peripheral outer edge of the movable iron core, so that the mutual interference among the movable iron core, the buffer piece and the metal shell is easy to cause, the use of a product is influenced, and the noise is increased; if the buffer piece is in clearance fit with the movable iron core and the movable iron core, abnormal movement sound can be generated due to shaking; if the buffer piece is in interference fit with the movable iron core and the movable iron core, resistance is generated at the initial stage of attraction contact, the attraction voltage parameter of the product is influenced, and the performance of the product is sacrificed.

Chinese patent application No. 201620611505.6 discloses a relay capable of reducing noise, comprising a movable iron core, a stationary iron core and a push rod member; the push rod component comprises a push rod and a movable spring mounting seat; one end of the push rod is fixed with the movable spring mounting seat, and the other end of the push rod penetrates through the static iron core and then is fixed with the movable iron core; in the static iron core, one end facing the movable iron core is also sleeved with a silencing sleeve made of rubber materials, and when the relay is attracted, the inner surface and the outer surface of the silencing sleeve are respectively contacted with the opposite end surfaces of the static iron core and the movable iron core, so that collision noise generated by the impact force generated by the moment of contact collision when the movable iron core collides with the static iron core is eliminated. The above scheme has the following defects: the sound damping sleeve made of rubber materials is arranged between the movable iron cores and can play a role in buffering and noise reduction, but can cause physical isolation of the movable iron cores and the movable iron cores in working, so that the magnetic conduction efficiency is greatly reduced, the magnetic conduction performance of a product is sacrificed, and meanwhile, the rubber materials are easy to age and deform after multiple impact contacts, and the performance parameters of the product are seriously influenced.

The Chinese patent with the application number of 202120690965.3 discloses a noise reduction structure of a direct current contactor, which comprises a static iron core fixedly arranged in the direct current contactor and a movable iron core movably arranged below the static iron core, wherein the movable iron core can move relative to the static iron core, one end of the static iron core, which faces the movable iron core, is provided with a first groove, a first sound insulation ring matched with the static iron core in size is arranged in the first groove, and the first sound insulation ring is used for reducing noise generated by contact collision between the movable iron core and the static iron core; the one end that moves the iron core and keep away from quiet iron core is provided with the second recess, installs the second sound-proof ring that matches with the size in the second recess, and the second sound-proof ring is used for reducing the noise that collides with outside casing when moving the iron core release and produces. In the above-mentioned scheme, although the patent scheme writes out that first sound insulating ring and second sound insulating ring can be used for making an uproar falls, but during the in-service use, first sound insulating ring and second sound insulating ring are to noise reduction not have the essence effect, and set up first sound insulating ring and second sound insulating ring on the sound iron core and still probably produce resonance or reverberation, can improve the noise on the contrary.

Disclosure of Invention

The invention aims to provide a low-noise relay which can reduce noise generated when dynamic and static contacts are attracted and does not negatively influence the performance of the relay.

In order to achieve the above purpose, the invention adopts the following technical scheme: the low-noise relay comprises a push rod and a yoke plate, wherein the yoke plate is provided with a yoke plate through hole which penetrates through from top to bottom so as to allow the push rod to pass through, the part of the push rod, which is positioned on the lower side of the yoke plate, is fixed with a movable iron core, the part of the push rod, which is positioned on the upper side of the yoke plate, is linked with a movable contact, the movable iron core or the push rod is provided with a lower noise reduction piece, the lower noise reduction piece is close to the yoke plate and is positioned on the lower side of the yoke plate, and the lower noise reduction piece is provided with a first elastic bulge which extends upwards; when the movable iron core drives the pushing rod to move upwards so as to enable the movable contact and the fixed contact to be in attraction contact, the lower noise reduction piece rises so that the first elastic bulge is adjacent to the yoke iron plate, and the lower noise reduction piece is elastically deformed.

When the movable contact is attracted, namely, the movable iron core moves upwards under the influence of the magnetic circuit part of the relay, the lower noise reduction piece arranged on the movable iron core or the pushing rod is driven to move upwards, so that the first elastic bulge is close to the yoke plate, the first elastic bulge can be contacted with the yoke plate along with the quick attraction of the movable contact, the first elastic bulge or the whole lower noise reduction piece has certain elasticity, the lower noise reduction piece can be elastically deformed in flexible contact with the yoke plate or the lower side piece of the yoke plate, and the impact speed during contact is slowed down through the elastic attribute, so that the noise is reduced, and the noise level is reduced. The lower noise reduction piece is arranged, so that the relay can be used for noise reduction when the normally open relay is used.

The lower noise reduction piece is arranged at the upper end of the movable iron core, and is closer to the yoke iron plate than to the static iron core positioned at the lower side of the movable iron core under the condition that the relay is provided with the static iron core, so that physical isolation of the movable iron core and the static iron core is not caused, and magnetic conduction efficiency is not reduced due to the physical isolation between the movable iron core and the static iron core, thereby avoiding the magnetic conduction performance reduction of the relay, and preventing resistance generation when the movable iron core and the static iron core are mutually close, namely preventing resistance increase when the movable contact and the static contact are disconnected, ensuring the quick disconnection of the movable contact, and further ensuring the product performance of the relay and not negatively affecting the performance of the relay.

The lower noise reduction piece can be made of a metal material with certain elasticity, such as a thinner iron reed or a thinner copper reed, so that the problem that the rubber material is aged, damaged and easy to deform after being used for many times is avoided. The lower noise reduction member of the present invention may be fixed to the movable iron core or the push rod by various means, such as welding, or elastic fastening.

Preferably, the middle part of the upper end surface of the movable iron core is recessed to form a containing groove, and the lower noise reduction piece is positioned in the containing groove.

The lower noise reduction piece is positioned in the accommodating groove, so that the relay can be made smaller in the height direction, and the miniaturization of the relay is kept.

Preferably, the upper end of the first elastic bulge extends out of the accommodating groove, and the upper edge of the first elastic bulge is positioned above the upper end face of the movable iron core.

The upper end of the first elastic bulge of the lower noise reduction piece is higher than the upper end face of the movable iron core, so that the first elastic bulge can be contacted with the yoke iron plate or a part arranged on the lower side of the yoke iron plate before the end face of the movable iron core, and the contact collision between the heavier movable iron core and the yoke iron plate is alleviated, thereby realizing noise reduction.

Preferably, a positioning groove is formed in the circumferential groove wall of the accommodating groove, and the lower noise reduction piece is provided with a positioning protrusion extending laterally and extending into the positioning groove; when the lower noise reduction piece is fixed with the movable iron core, the lower noise reduction piece is supported on the bottom of the accommodating groove, and the positioning protrusion extends into the positioning groove; the positioning protrusion gradually extends to the circumferential outside from bottom to top, and when the positioning protrusion is positioned in the positioning groove, the distance between the outer edge of the upper end of the positioning protrusion and the axial line of the pushing rod is larger than the distance between the inner edge of the upper end of the positioning groove and the axial line of the pushing rod.

The positioning groove is matched with the positioning protrusion so as to facilitate the assembly of the lower noise reduction piece, and the lower noise reduction piece can be clamped in the accommodating groove; when the lower noise reduction piece is assembled, the lower noise reduction piece enters the accommodating groove, the outer edge of the positioning bulge is contacted and propped against the groove wall of the accommodating groove, and the positioning bulge stretches into the positioning groove along with the continuous downward movement of the lower noise reduction piece, and the upper and lower limiting of the lower noise reduction piece is realized by enabling the lower end surface of the lower noise reduction piece to be close to the groove bottom of the accommodating groove or contact with the groove bottom of the accommodating groove, so that the lower noise reduction piece is clamped in the positioning groove, and the lower noise reduction piece is prevented from shaking relative to the movable iron core; the lower noise reduction piece can be prevented from shaking relative to the movable iron core only by enabling the positioning protrusion to be clamped into the positioning groove. The positioning protrusion may be formed in an arc shape, that is, an outer edge of the positioning protrusion projected upward or downward is formed in an arc shape.

Preferably, the lower noise reduction member further has a second elastic protrusion extending downward.

When the movable contact points are attracted to enable the lower noise reduction piece to be in contact with the yoke plate, the lower noise reduction piece has a trend of downward elastic deformation, namely the whole lower noise reduction piece is deformed and moves downwards, and the movable iron core is further relaxed to be in collision contact with the bottom of the accommodating groove through the second elastic bulge, so that noise generated when the movable iron core is attracted to the yoke iron plate is reduced.

Preferably, the upper end of the positioning protrusion is provided with a bending section bending towards the axis side of the pushing rod.

The setting of bending segment can be convenient for the location protruding slide-in constant head tank in and avoid the excessive friction between location protruding and holding tank cell wall.

Preferably, the first elastic protrusion includes a first contact section at an end portion, the first contact section is curved away from or near the push rod axis side, and an inclined section extending from bottom to top away from or near the push rod axis side is provided at a position deviated from the end portion.

Through setting up first contact section to make the contact surface of first elastic bulge and yoke iron plate be the cambered surface, so that the contact deformation of the lower terminal surface of piece and yoke iron plate of making an uproar falls in the realization, guarantee the stability of making an uproar piece when using down, the low-level noise when keeping the relay and using. The arrangement of the inclined section can enable the first elastic bulge to be more convenient for elastic deformation so as to buffer and reduce noise.

Preferably, the left and right opposite sides of the lower noise reduction piece are provided with the first elastic protrusions, and the front and rear opposite sides of the lower noise reduction piece are provided with the second elastic protrusions; the lower noise reduction piece comprises a ring-shaped bottom, a bottom through hole which penetrates through the bottom vertically to enable the pushing rod to pass through is formed in the center of the bottom, and the lower end of the first elastic bulge and the upper end of the second elastic bulge are connected with the peripheral outer edge of the bottom.

The first elastic bulge and the second elastic bulge are staggered relatively, so that the structure of the lower noise reduction part can be more stable under the condition of smaller size, and the collision contact force distribution can be more uniform during use, so that the service performance of the relay is more stable; when the number of the first elastic protrusions and the second elastic protrusions is at least three, the first elastic protrusions and the second elastic protrusions should be uniformly spaced in a ring shape. The first elastic bulge and the second elastic bulge are connected with the peripheral outer edge of the bottom, so that the production and the manufacturing of the lower noise reduction part are facilitated, and the lower noise reduction part can be obtained by processing in a sheet metal stamping mode. The lower noise reduction part has a simple and light structure, does not influence the normal rising of the movable iron core, and does not negatively influence the performance of the relay.

Preferably, an upper noise reduction piece is arranged above the yoke plate, a movable reed for fixing the movable contact is arranged at the upper end of the pushing rod, a compression spring is arranged below the movable reed, the upper noise reduction piece is limited at the lower side of the compression spring, and the upper noise reduction piece is provided with an upper elastic bulge extending downwards; when the movable iron core moves downwards to break the movable contact, the upper noise reduction piece descends to enable the upper elastic bulge to be close to the yoke iron plate, and the upper noise reduction piece is elastically deformed.

When the dynamic contact and the static contact of the relay are disconnected, the movable iron core and the pushing rod move downwards, and the upper noise reduction piece moves downwards and is in flexible contact with the yoke iron plate or a positioning plate (insulating plate) arranged on the yoke iron plate for noise reduction. The upper noise reduction part is pressed by the compression spring, and the upper noise reduction part can be fixed without welding with parts such as a push rod and the like, so that the parts of the relay are more convenient to assemble. The invention can be used for noise reduction when the normally closed relay is used.

Preferably, the upper elastic bulge gradually extends to the circumferential outer side of the pushing rod from top to bottom; the lower end of the upper elastic bulge is provided with a second arc-shaped contact section; the number of the upper elastic bulges is two, the yoke iron plate is provided with a positioning plate, the positioning plate is provided with a positioning part extending upwards, the positioning part is provided with a positioning notch, and the upper elastic bulges are positioned at the positioning notch; or the number of the upper elastic bulges is at least three, and the at least three upper elastic bulges are uniformly arranged at intervals in a ring shape on the circumferential outer side of the upper noise reduction piece; the compression spring is sleeved on the pushing rod, the upper noise reduction piece is provided with an upward extending enclosing block, and the lower end of the compression spring is positioned on the inner side of the enclosing block.

The upper elastic bulge extends obliquely instead of directly downwards, so that the upper elastic bulge is more convenient to flexibly contact and elastically deform with the yoke iron plate or a positioning plate arranged on the yoke iron plate when the dynamic and static contacts are disconnected. The lower end of the upper elastic bulge is arc-shaped, and the formed arc-shaped surface is used for contacting with the yoke plate or a positioning plate arranged on the yoke plate, so that the contact surface of the upper noise reduction piece, which is initially contacted with the yoke plate or the positioning plate arranged on the yoke plate, is minimized, and the flexible contact deformation of the upper elastic bulge is facilitated. When the number of the upper elastic bulges is two, the positioning notch is used for limiting the rotation of the upper noise reduction piece, so that the upper noise reduction piece is prevented from being inclined in a shifting way; when the number of the upper elastic bulges is at least three, the upper noise reduction piece is supported by the at least three upper elastic bulges so as to ensure the stability of the upper noise reduction piece; through the mode, the stability of the upper noise reduction piece in use is guaranteed, and the upper noise reduction piece can be contacted with the yoke iron plate or the positioning plate to reduce noise. The upper noise reduction part is also provided with a surrounding baffle which is matched with the compression spring, so that the radial deflection of the upper noise reduction part is avoided, and the stability of the upper noise reduction part in use is ensured. The upper noise reduction piece is simple in structure and light, normal rising of the movable iron core is not affected, and negative influence on the performance of the relay is not caused.

The invention has the advantages of reducing noise during the attraction of the dynamic contact and the static contact and not negatively affecting the performance of the relay.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1.

Fig. 2 is an enlarged view of the lower noise reducer of fig. 1.

Fig. 3 is a schematic structural diagram of the lower noise reduction member of embodiment 1.

Fig. 4 is a schematic structural view of the upper noise reduction member of embodiment 2.

Fig. 5 is a schematic structural diagram of the positioning plate of embodiment 2.

Fig. 6 is a schematic structural diagram of the upper noise reduction member of embodiment 2.

Fig. 7 is a schematic view of the structure of embodiment 3 at the upper noise reduction member.

Fig. 8 is a schematic structural diagram of the upper noise reduction member of embodiment 3.

Detailed Description

The invention is further described below with reference to the drawings and specific embodiments.

Example 1

As shown in fig. 1 to 3, the embodiment discloses a low noise relay, which comprises a yoke plate 11, a positioning plate 12 is arranged above the yoke plate 11, an insulating cover (not shown in the drawing) is supported on the positioning plate 12, the insulating cover is used for fixing a stationary contact (not shown in the drawing), a chamber for accommodating a movable contact 131 and the stationary contact is formed between the positioning plate 12 and the insulating cover, the movable contact 131 is fixed on a movable reed 13, and the movable reed 13 is arranged at the upper end of a push rod 14. Yoke plate through holes and positioning plate through holes which penetrate up and down are respectively formed in the middle of the yoke plate 11 and the positioning plate 12 and are used for allowing the lower end of the pushing rod 14 to penetrate through, a boss 141 extending outwards in the circumferential direction is arranged at the position, deviating from the upper end, of the pushing rod 14, the width of the boss 141 is larger than the inner diameter of the positioning plate through hole, a compression spring 142 is sleeved on the pushing rod 14, and the compression spring 142 is located between the movable reed 13 and the boss 141. A movable iron core 15 is arranged below the yoke iron plate 11, and the movable iron core 15 is fixed with a push rod 14. The relay of this embodiment is a high-voltage dc relay, and the relay is not provided with a static iron core.

The middle part of the upper end surface of the movable iron core 15 is recessed to form a containing groove 151 for containing the lower noise reduction piece 2, the lower noise reduction piece 2 is clamped in the containing groove 151, the lower noise reduction piece 2 is close to the yoke iron plate 11 and is positioned on the lower side of the yoke iron plate 11, and the lower noise reduction piece 2 is provided with two first elastic protrusions 21 extending upwards and two second elastic protrusions 22 extending obliquely downwards. Wherein, the upper part of the first elastic bulge 21 gradually extends to the outer side of the circumference of the axis of the pushing rod 14 from top to bottom, and the second elastic bulge 22 gradually extends to the outer side of the circumference of the axis of the pushing rod 14 from top to bottom. Wherein, the two first elastic bulges 21 and the two second elastic bulges 22 are symmetrically arranged with the axis of the pushing rod 14 as the center. The first elastic protrusion 21 includes a first contact section 211 at the end, the first contact section 211 is bent, the first contact section 211 is located outside the accommodating groove 151, so that the upper edge of the first elastic protrusion 21 is located above the upper end surface of the movable iron core 15, and an inclined section 210 extending from bottom to top away from the push rod side is provided at the position deviated from the end of the first elastic protrusion 21.

The lower noise reduction member 2 has a sheet-shaped bottom 23, a bottom through hole 24 penetrating up and down to pass through the lower end of the push rod 14 is provided at the center of the bottom 23, and the bottom 23 is ring-shaped. The bottom 23 is provided with a first elastic bulge 21 on the left and right opposite sides, a second elastic bulge 22 on the front and back opposite sides of the bottom 23, and the upper end of the second elastic bulge 22 and the lower end of the first elastic bulge 21 are connected with the peripheral outer edge of the bottom 23.

The circumferential groove wall of the accommodating groove 151 is provided with a positioning groove 152 which extends to the circumferential outside so that the cross section is annular, the inner diameter of the lower end of the positioning groove 152 is small, the inner diameter of the upper end of the positioning groove 152 is large, the lower noise reduction part 2 is provided with two positioning protrusions 25 which extend laterally and extend into the positioning groove 152, the positioning protrusions 25 gradually extend to the circumferential outside from bottom to top (namely extend to the side far away from the pushing rod 14), and when the positioning protrusions 25 are positioned in the positioning groove 152, the distance between the outer edge of the upper end of the positioning protrusions 25 and the axis of the pushing rod 14 is larger than the distance between the inner edge of the upper end of the positioning groove 152 and the axis of the pushing rod 14. Wherein, the upper end of the positioning protrusion 25 is provided with a bending section 26 bending towards the axis side of the push rod 14. The first elastic bulge 21 is in a sheet shape, the positioning bulge 25 is obtained by stamping the first elastic bulge 21 through a metal plate, and a window 27 is formed at the lower section of the first elastic bulge 21. When the lower noise reduction member of the present embodiment is fixed in the accommodating groove 151, the positioning protrusion 25 is located in the positioning groove 152, the upper end of the bending section 26 of the positioning protrusion 52 abuts against the axial groove wall (top groove wall) of the positioning groove 152, and the lower end of the second elastic protrusion 22 abuts against the bottom of the accommodating groove 151.

When the relay of the present embodiment is in a moving contact breaking state, the end of the second elastic protrusion 22 is supported on the bottom of the accommodation groove 151, and the first elastic protrusion 21 is not in contact with the yoke plate 11; when the push rod 14 and the movable iron core 15 move upwards to make the movable contact point and the movable contact point in attraction contact, the lower noise reduction piece 2 rises, the first elastic bulge 21 is in contact with the yoke plate and is elastically deformed, the whole lower noise reduction piece 2 is subjected to downward movement trend force, the second elastic bulge 22 is propped against the bottom of the accommodating groove 151 and is deformed, so that the first elastic bulge 21 of the embodiment is completely positioned in the accommodating groove 151, and the second elastic bulge 22 is approximately horizontally arranged.

Example 2

As shown in fig. 4 to 6, this embodiment differs from embodiment 1 in that: an upper noise reduction piece 3 is arranged above the positioning plate 12, and when the movable iron core and the pushing rod move downwards to break the movable contact, the upper noise reduction piece 3 descends to be in contact with the positioning plate 12 and elastically deforms.

The upper noise reduction part 3 comprises a disc body 31 with an annular cross section, the circumferential edge of the disc body 31 is provided with an upward-edge enclosing block 32, the cross section of the enclosing block 32 is annular, the lower end of a compression spring 142 is positioned in the enclosing block 32 and supported on the disc body 31, the upper noise reduction part 3 is limited on the lower side of the compression spring 142, two opposite sides of the enclosing block 32 are respectively provided with an upper elastic bulge 33, the upper elastic bulge 33 extends from top to bottom to the circumferential outside of the push rod 14, and the lower end of the upper elastic bulge 33 is provided with an arc-shaped second contact section 34, so that the surface of the upper elastic bulge 33, which is used for being contacted with the upper end surface of the positioning plate 12, is an arc surface. The positioning plate 12 is formed with an upwardly extending annular positioning portion 121, the positioning portion 121 is provided with two positioning notches 122 penetrating inside and outside and opening upwards, and the two upper elastic protrusions 33 respectively penetrate through the positioning notches 122.

Example 3

As shown in fig. 7 and 8, this embodiment differs from embodiment 2 only in that: the number of the upper elastic protrusions 33 is three, the three upper elastic protrusions 33 are uniformly arranged at intervals on the periphery of the enclosure 32 in a ring shape, and the positioning plate 12 is not provided with the positioning part 112 and the positioning notch 113 as shown in fig. 5.

When the relays of embodiment 2 and embodiment 3 are in the moving-contact attraction contact state, the push rod 14 pushes up the upper noise reduction member 3, and at this time, the upper elastic protrusions 33 are not elastically deformed; when the push rod 14 and the movable iron core 15 move downward to bring the relay into a moving contact breaking state, the upper noise reduction member 3 moves downward, and the upper elastic protrusion 33 abuts against the positioning plate 12 to be elastically deformed.

Claims

1. The utility model provides a low noise relay, includes push rod and yoke board, the yoke board is equipped with runs through from top to bottom in order to supply the yoke board through-hole that the push rod passed through, the part that the push rod is located yoke board downside is fixed with movable iron core, the part that the push rod is located yoke board upside links its characterized in that with movable contact: the movable iron core or the pushing rod is provided with a lower noise reduction piece, the lower noise reduction piece is close to the yoke iron plate and is positioned at the lower side of the yoke iron plate, and the lower noise reduction piece is provided with a first elastic bulge extending upwards; when the movable iron core drives the pushing rod to move upwards so as to enable the movable contact and the fixed contact to be in attraction contact, the lower noise reduction piece rises so that the first elastic bulge is adjacent to the yoke iron plate, and the lower noise reduction piece is elastically deformed.

2. The low noise relay of claim 1, wherein: the middle part of the upper end face of the movable iron core is recessed to form an accommodating groove, and the lower noise reduction piece is positioned in the accommodating groove.

3. The low noise relay of claim 2, wherein: the upper end of the first elastic bulge extends out of the accommodating groove, and the upper edge of the first elastic bulge is positioned above the upper end face of the movable iron core.

4. A low noise relay according to claim 2 or 3, characterized in that: a positioning groove is formed in the circumferential groove wall of the accommodating groove, and the lower noise reduction piece is provided with a positioning protrusion which extends laterally and stretches into the positioning groove; when the lower noise reduction piece is fixed with the movable iron core, the lower noise reduction piece is supported on the bottom of the accommodating groove, and the positioning protrusion extends into the positioning groove; the positioning protrusion gradually extends to the circumferential outside from bottom to top, and when the positioning protrusion is positioned in the positioning groove, the distance between the outer edge of the upper end of the positioning protrusion and the axial line of the pushing rod is larger than the distance between the inner edge of the upper end of the positioning groove and the axial line of the pushing rod.

5. The low noise relay of claim 4, wherein: the lower noise reduction member further has a second elastic protrusion extending obliquely downward.

6. The low noise relay of claim 4, wherein: the upper end of the positioning bulge is provided with a bending section which bends towards the axis side of the pushing rod.

7. A low noise relay according to claim 1 or 2 or 3, characterized in that: the first elastic bulge comprises a first contact section positioned at the end part, the first contact section is bent away from or close to the axis side of the pushing rod, and an inclined section extending away from or close to the axis side of the pushing rod from bottom to top is arranged at the position, deviating from the end part, of the first elastic bulge.

8. The low noise relay of claim 5, wherein: the left side and the right side of the lower noise reduction piece are respectively provided with the first elastic bulges, and the front side and the rear side of the lower noise reduction piece are respectively provided with the second elastic bulges;

the lower noise reduction piece comprises a ring-shaped bottom, a bottom through hole which penetrates through the bottom vertically to enable the pushing rod to pass through is formed in the center of the bottom, and the lower end of the first elastic bulge and the upper end of the second elastic bulge are connected with the peripheral outer edge of the bottom.

9. A low noise relay according to claim 1 or 2 or 3, characterized in that: an upper noise reduction piece is arranged above the yoke plate, a movable reed for fixing the movable contact is arranged at the upper end of the pushing rod, a compression spring is arranged below the movable reed, the upper noise reduction piece is limited at the lower side of the compression spring, and the upper noise reduction piece is provided with an upper elastic bulge extending downwards; when the movable iron core moves downwards to break the movable contact, the upper noise reduction piece descends to enable the upper elastic bulge to be close to the yoke iron plate, and the upper noise reduction piece is elastically deformed.

10. The low noise relay of claim 9, wherein: the upper elastic bulge gradually extends to the outer side of the circumference of the pushing rod from top to bottom; the lower end of the upper elastic bulge is provided with a second arc-shaped contact section;

the number of the upper elastic bulges is two, the yoke iron plate is provided with a positioning plate, the positioning plate is provided with a positioning part extending upwards, the positioning part is provided with a positioning notch, and the upper elastic bulges are positioned at the positioning notch; or the number of the upper elastic bulges is at least three, and the at least three upper elastic bulges are uniformly arranged at intervals in a ring shape on the circumferential outer side of the upper noise reduction piece;

the compression spring is sleeved on the pushing rod, the upper noise reduction piece is provided with an upward extending enclosing block, and the lower end of the compression spring is positioned on the inner side of the enclosing block.