Interlayer connector assembly, stacked connector unit and data server

Abstract

The utility model relates to the technical field of circuit board connecting devices, in particular to an interlayer connector assembly, a stacked connector unit and a data server. The interlayer connector assembly comprises two on-board connectors and a stacked connector group which are respectively connected with the two interconnected circuit boards; the stacked connector group comprises stacked connector units with two opposite plugging ends, the two adjacent stacked connector units are plugged, and the two farthest plugging ends of the stacked connector group are respectively plugged with the two on-board connectors; the stacked connector units have a set unit height to change the stacking height of the interlayer connector assembly to accommodate the spacing between the two interconnected circuit boards when different numbers of stacked connector units are used. By adopting the stacked connector units of one specification and changing the number of the units, various distances between two boards can be supported, and various connectors with different heights do not need to be manufactured, so that the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit board connection devices, specifically to mezzanine connector assemblies and stacked connector units, and data servers. Background Technology

[0002] The mezzanine connector assembly is mainly used for interconnection and communication between two parallel circuit boards inside a data server. Its basic structure can be found in a high-speed mezzanine connector system disclosed in Chinese Utility Model Patent No. CN215816552U. The high-speed mezzanine connector system includes a high-speed mezzanine connector and a mating connector for mating. The high-speed mezzanine connector includes a housing and multiple modules installed in the housing and arranged in parallel. The mating connector includes a mating housing and multiple mating modules installed in the mating housing and arranged in parallel. The mating modules of the mating connector have the same structure as the modules in the high-speed mezzanine connector. A first PCB board is installed on the side of the high-speed mezzanine connector away from the mating connector, and a second PCB board is installed on the side of the mating connector away from the high-speed mezzanine connector.

[0003] Inside a data server, there is a predetermined distance between two parallel circuit boards. To accommodate this distance, connector assemblies with corresponding stacking heights are required. The stacking height of the connectors is the total height of all connectors in the insertion direction after they are plugged in. This stacking height must match the distance between the two circuit boards to ensure interconnection. However, a server contains many circuit boards with varying spacing. To accommodate the interconnection of these different boards, connector assemblies with different stacking heights are often needed based on the varying distances between the boards. Current designs typically involve varying the height of the connectors themselves, using a mix of connectors of different heights to change the stacking height of the connector assembly, thus adapting to various board spacings. Figure 1 , Figure 2 As shown, two parallel interconnected circuit boards are defined as the first circuit board 10 and the second circuit board 20, respectively. The connector on the first circuit board 10 is connector 11 on the first board, and the connector on the second circuit board 20 is connector 21 on the second board. Figure 1 In the circuit, the distance between the first circuit board 10 and the second circuit board 20 is small, and both the connector 11 on the first board and the connector 21 on the second board are connectors with small height. Figure 2 In this design, the distance between the first circuit board 10 and the second circuit board 20 is relatively large. The height of connector 11 on the first board remains constant, while connector 21 on the second board uses a taller connector. This allows for adaptation to different distances between the two boards by using connectors of different heights.

[0004] Since there are often many different pitches between different servers and different circuit boards within the same server, connectors of different heights need to be manufactured to accommodate various pitches. There are many connector specifications, and the mold development cost is high, which increases production costs. Utility Model Content

[0005] The purpose of this utility model is to provide a mezzanine connector assembly to solve the problem of high production costs caused by the large number of connector specifications required to adapt to different two-board spacings in current mezzanine connector assemblies; the purpose of this utility model is also to provide a stacked connector unit and a data server to solve the above problems.

[0006] The technical solution of this utility model's sandwich connector assembly is as follows:

[0007] A mezzanine connector assembly includes two on-board connectors for connecting to two interconnected circuit boards respectively, and a stacked connector group connecting the two on-board connectors; the stacked connector group includes at least two stacked connector units having two oppositely arranged mating ends, two adjacent stacked connector units being mated together, and the two farthest mating ends of the stacked connector group being mated together with the two on-board connectors respectively; or the stacked connector group includes a stacked connector unit with two mating ends of the stacked connector unit being mated together with the two on-board connectors respectively; the stacked connector unit has a set unit height to change the stacking height of the mezzanine connector assembly to adapt to the spacing between the two interconnected circuit boards when using different numbers of stacked connector units.

[0008] Beneficial effects: This utility model innovatively provides a combinable mezzanine connector assembly, which sets up a stacked connector group on the basis of connectors on two boards. The stacked connector group can be formed by combining different numbers of stacked connector units. Each stacked connector unit is inserted sequentially and into the connectors on the two boards to stack between two parallel interconnected circuit boards. The stacked connector unit has a set unit height. For each unit increase in the distance between the two interconnected circuit boards, one stacked connector unit can be added for matching. When using different numbers of stacked connector units, the stacking height of the mezzanine connector assembly can be changed to adapt to the distance between the two interconnected circuit boards. By using a single specification of stacked connector unit and changing the number of units, various distances between the two boards can be supported. It is not necessary to manufacture many connectors of different heights, which helps to reduce production costs.

[0009] Furthermore, the two plug ends of the stacked connector unit and the plug ends of the connectors on the two boards are arranged in a centrally symmetrical manner. The plug ends of the stacked connector unit are adapted to be plugged into the plug ends of the connectors on the board or adapted to be plugged into the corresponding plug ends of another stacked connector unit.

[0010] Furthermore, the stacked connector unit includes a housing and terminal modules mounted in the housing. Each terminal module includes an insulator and terminals fixed in the insulator. Each connector forms a connection through the terminals.

[0011] Furthermore, the outer casing includes two separate housings, and the insulator of the terminal module has two snap-fit ​​structures that snap into the two housings respectively, with the snap-fit ​​directions of the two snap-fit ​​structures being opposite.

[0012] Furthermore, the terminals of the terminal module include signal terminals, which are arranged in pairs to form differential pairs, and at least one side of the insulator thickness direction of the terminal module is provided with a shielding sheet corresponding to the differential pairs one by one.

[0013] The technical solution of the stacked connector unit of this utility model is as follows:

[0014] A stacked connector unit having two oppositely arranged plug terminals, one of which is used to plug into a connector on one of the boards or an adjacent stacked connector unit, and the other is used to plug into a connector on another board or an adjacent stacked connector unit. The stacked connector unit has a set unit height to change the stacking height of the mezzanine connector assembly to adapt to the spacing between the interconnecting two boards when using different numbers of stacked connector units.

[0015] Beneficial effects: This utility model innovatively provides a stacked connector unit for changing the stacking height of mezzanine connector assemblies and can be used in combination. The stacked connector unit has a set unit height. For each unit increase in the spacing between two interconnected circuit boards, one stacked connector unit can be added for matching. By using different numbers of stacked connector units, the stacking height of the mezzanine connector assembly can be changed to adapt to the spacing between the two interconnected circuit boards. By using a single specification of stacked connector unit and changing the number of units, various spacings between the two boards can be supported. It is not necessary to manufacture many connectors of different heights, which helps to reduce production costs.

[0016] Furthermore, the stacked connector unit includes a housing and terminal modules mounted in the housing. Each terminal module includes an insulator and terminals fixed in the insulator. Each connector forms a connection through the terminals.

[0017] Furthermore, the outer casing includes two separate housings, and the insulator of the terminal module has two snap-fit ​​structures that snap into the two housings respectively, with the snap-fit ​​directions of the two snap-fit ​​structures being opposite.

[0018] Furthermore, the terminals of the terminal module include signal terminals, which are arranged in pairs to form differential pairs, and at least one side of the insulator thickness direction of the terminal module is provided with a shielding sheet corresponding to the differential pairs one by one.

[0019] The technical solution of the data server of this utility model is:

[0020] A data server includes a mezzanine connector assembly, which includes two on-board connectors for connecting to two interconnected circuit boards, and a stacked connector group connecting the two on-board connectors. The stacked connector group includes at least two stacked connector units having two oppositely positioned mating ends, with adjacent stacked connector units mating together and the two farthest mating ends of the stacked connector group mating with the on-board connectors, respectively; or the stacked connector group includes one stacked connector unit with two mating ends mating with the on-board connectors, respectively. The stacked connector unit has a set unit height to change the stacking height of the mezzanine connector assembly to adapt to the spacing between the two interconnected circuit boards when using different numbers of stacked connector units. The mezzanine connector assembly is provided in at least two types, with different numbers of stacked connector units in different types of mezzanine connector assemblies, and each stacked connector unit having the same specifications.

[0021] Beneficial Effects: This utility model innovatively provides a combinable mezzanine connector assembly for data servers. It features a stacked connector group built upon connectors on two boards. This stacked connector group can be formed by combining different numbers of stacked connector units. Each stacked connector unit is sequentially inserted into the connectors on both boards to stack between two parallel interconnected circuit boards. The stacked connector units have a set unit height. For every unit increase in the spacing between the two interconnected circuit boards, one additional stacked connector unit is added for matching. By using different numbers of stacked connector units, the stacking height of the mezzanine connector assembly can be changed to adapt to the spacing between the two interconnected circuit boards. By using a single specification of stacked connector units and changing the number of units, various board spacings can be supported, eliminating the need to manufacture many connectors of different heights and thus reducing production costs.

[0022] Furthermore, the two plug ends of the stacked connector unit and the plug ends of the connectors on the two boards are arranged in a centrally symmetrical manner. The plug ends of the stacked connector unit are adapted to be plugged into the plug ends of the connectors on the board or adapted to be plugged into the corresponding plug ends of another stacked connector unit.

[0023] Furthermore, the stacked connector unit includes a housing and terminal modules mounted in the housing. Each terminal module includes an insulator and terminals fixed in the insulator. Each connector forms a connection through the terminals.

[0024] Furthermore, the outer casing includes two separate housings, and the insulator of the terminal module has two snap-fit ​​structures that snap into the two housings respectively, with the snap-fit ​​directions of the two snap-fit ​​structures being opposite.

[0025] Furthermore, the terminals of the terminal module include signal terminals, which are arranged in pairs to form differential pairs, and at least one side of the insulator thickness direction of the terminal module is provided with a shielding sheet corresponding to the differential pairs one by one. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a mezzanine connector assembly in the prior art;

[0027] Figure 2 This is a schematic diagram of another mezzanine connector assembly in the prior art;

[0028] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the mezzanine connector assembly of this utility model;

[0029] Figure 4 for Figure 3 A schematic diagram of the stacked connector unit in the diagram;

[0030] Figure 5 for Figure 4 Exploded view of the stacked connector unit in the diagram;

[0031] Figure 6 for Figure 4 A schematic diagram of the first housing of the stacked connector unit separating;

[0032] Figure 7 for Figure 5 A three-dimensional schematic diagram of the terminal module in the diagram;

[0033] Figure 8 for Figure 5 Side view of the terminal module in the middle;

[0034] Figure 9 for Figure 7 A schematic diagram showing the fit between the shielding sheet and the insulator;

[0035] Figure 10 This is a schematic diagram of the structure of Embodiment 2 of the mezzanine connector assembly of this utility model.

[0036] In the diagram: 10, First circuit board; 11, Connector on the first board; 20, Second circuit board; 21, Connector on the second board; 30, Stacked connector unit; 301, First sub-shell; 302, Second sub-shell; 303, Slot; 31, Terminal module; 311, Insulator; 312, Signal terminal; 313, Grounding terminal; 314, Shielding sheet; 315, Clip; 316, Claw; 317, Slot. Detailed Implementation

[0037] The mezzanine connector assembly of this invention uses a single type of stacked connector unit, and by changing the number of units, it can support various two-board pitches, eliminating the need to manufacture many different types of connectors, which helps reduce production costs.

[0038] Embodiment 1 of the mezzanine connector assembly of this utility model:

[0039] The mezzanine connector assembly includes two on-board connectors for connecting to two interconnecting circuit boards, and a stacked connector group connecting the two on-board connectors. The stacked connector group includes at least one stacked connector unit, each having two opposing mating ends. One of these mating ends is used to mate with one of the on-board connectors or an adjacent stacked connector unit, and the other is used to mate with another on-board connector or an adjacent stacked connector unit. Different stacked connector units can be interconnected to form the stacked connector group. The on-board connectors are interconnected through the stacked connector group. Using different numbers of stacked connector units can change the stacking height of the mezzanine connector assembly to accommodate the spacing between the two interconnecting circuit boards.

[0040] Specifically, such as Figure 3 , Figure 4 As shown, the mezzanine connector assembly includes a first-board connector 11, a second-board connector 21, and a stacked connector group connecting the first-board connector 11 and the second-board connector 21. The first-board connector 11 is connected to the first circuit board 10, and the second-board connector 21 is connected to the second circuit board 20. The first circuit board 10 and the second circuit board 20 constitute two parallel interconnected circuit boards. The mezzanine connector assembly is disposed between the two circuit boards and realizes the interconnection of the two circuit boards. In this embodiment, the stacked connector group is formed by a stacked connector unit 30. The stacked connector unit 30 is a connector that can be plugged into at both ends. The stacked connector unit 30 has two opposite plug-in ends, and the two plug-in ends are respectively plugged into the first-board connector 11 and the second-board connector 21. The plugging direction of each connector is consistent with the spacing direction of the two parallel interconnected circuit boards. By connecting the stacked connector unit 30 between the first-board connector 11 and the second-board connector 21, the stacking height of the mezzanine connector assembly is increased to accommodate the spacing between the upper and lower circuit boards.

[0041] The two plug-in ends of the stacked connector unit 30 have identical structures. One end of the on-board connector is connected to the circuit board, and the other end is its plug-in end for plugging into the stacked connector unit 30. The plug-in end of the stacked connector unit 30 is adapted to plug into the plug-in end of the on-board connector. The plug-in end of the first on-board connector 11 has the same structure as the plug-in end of the second on-board connector 21. The plug-in end of the stacked connector unit 30 has the same structure as the plug-in end of the on-board connector, and the two plug-in ends of the stacked connector unit 30 are centrally symmetrically arranged. The plug-in ends of the two on-board connectors are also centrally symmetrically arranged. That is, after rotating one plug-in end of the stacked connector unit 30 by 180°, it coincides with the plug-in end of the other side. After rotating the plug-in end of the first on-board connector 11 by 180°, it can coincide with the plug-in end of the second on-board connector 21. This simplifies the connector plug-in structure and facilitates the plug-in operation.

[0042] Combination Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The stacked connector unit 30 includes a housing and terminal modules 31 installed within the housing. The housing is an insulating shell. Each terminal module 31 includes an insulator 311 and terminals fixed within the insulator 311. Each connector is electrically connected via the terminals. The terminals of the terminal module 31 include signal terminals 312 and ground terminals 313. The signal terminals 312 are arranged in pairs to form differential pairs. Each differential pair has a ground terminal 313 on both sides. The signal terminals 312 and ground terminals 313 are arranged side by side. The width direction of the insulator 311 is the front-to-back direction, and the terminals are arranged side by side along the front-to-back direction. In other embodiments, mounting cavities corresponding to each terminal can be provided on the insulating shell, allowing the terminals to be directly installed in the insulating shell without separately providing terminal modules 31.

[0043] The outer casing comprises two separate housings, namely a first housing 301 and a second housing 302, which are distributed in the connector insertion direction. The insulator 311 of the terminal module 31 has two snap-fit ​​structures that respectively snap into the two housings, with the snap-fit ​​directions of the two structures being opposite. The insulator 311 has latches 315 on both sides in the width direction, and two latches 315 are symmetrically arranged vertically on the same side. The adjacent ends of the first sub-shell 301 and the second sub-shell 302 are provided with relatively cantilevered snap-fit ​​arms. The snap-fit ​​arm of the upper first sub-shell 301 extends downward, and the snap-fit ​​arm of the lower first sub-shell 301 extends upward. The snap-fit ​​arms are provided with snap-fit ​​holes 303. The terminal module 31 can be snapped upward into the snap-fit ​​hole 303 of the first sub-shell 301 by the upper snap-fit ​​315, and snapped downward into the snap-fit ​​hole 303 of the second sub-shell 302 by the lower snap-fit ​​315. During assembly, each terminal module 31 can be installed on the second sub-shell 302 first, and then assembled as a whole with the first sub-shell 301. The snap-fit ​​cooperation between the snap-fit ​​315 and the snap-fit ​​hole 303 ensures that the terminal module 31 is installed firmly and facilitates assembly. In other embodiments, the shell can also be made into an integral structure. In this case, the terminal module can be interference-fitted into the shell from one side to achieve fixation.

[0044] The terminal module 31 has a shielding plate 314 on one side of the insulator 311 in the thickness direction, corresponding to a differential pair. The thickness direction of the insulator 311 is left-right. Several shielding plates 314 are provided on one side of the insulator 311 in the thickness direction. The number of shielding plates 314 on the same side is the same as the number of differential pairs. The shielding plates 314 on the same side are spaced apart, and the differential pairs correspond to the shielding plates 314 left-right. The two edges of the shielding plate 314 in the width direction are provided with bent claws 316. The grounding terminal 313 is provided with a slot 317. The insulator 311 is provided with a clearance groove at the position corresponding to the slot 317. The claws 316 of the shielding plate 314 can pass through the clearance groove and be engaged in the slot 317 of the grounding terminal 313. One shielding plate 314 is connected to two adjacent grounding terminals 313. Each shielding plate 314 shields one differential pair. When the number of differential pairs increases or decreases, only the number of shielding plates 314 needs to be increased or decreased. There is no need to make a new mold for the shielding plate 314, saving costs. In other embodiments, a shielding sheet capable of covering all differential pairs of the same terminal module may be provided on one side in the insulation thickness direction. In other embodiments, shielding sheets may be provided on both sides in the insulation thickness direction.

[0045] The signal terminals 312 and ground terminals 313 of the stacked connector unit 30 both have spring-loaded ends at their insertion points. The ends of the spring-loaded ends are bent, with the bending directions of the spring-loaded ends at the upper and lower ends of the stacked connector unit 30 being opposite. The spring-loaded ends of each terminal are bent towards the same side, and a contact portion is provided on the side facing the bending direction. The terminals of the connectors on the board also have spring-loaded ends at their insertion points, with the ends of the spring-loaded ends bent and a contact portion provided on the side facing the bending direction. The contact portions of the stacked connector unit 30 can form conductive contact with the contact portions of the connectors on the board during insertion. The contact portion of the upper insertion point of the stacked connector unit 30 faces left, and the contact portion of the insertion point of the first board connector 11 faces right, forming an insertion fit. The contact portion of the lower insertion point of the stacked connector unit 30 faces right, and the contact portion of the insertion point of the second board connector 21 faces left, forming an insertion fit.

[0046] During insertion, the spring contacts of the terminals of the stacked connector unit 30 and the spring contacts of the terminals of the connector on the board press against each other and deform. Because the spring contacts at the upper and lower ends of the stacked connector unit 30 bend in opposite directions, force balance is ensured. Due to the centrally symmetrical structure of the insertion end, when the terminal module 31 is installed in the housing, regardless of whether it is inserted correctly or incorrectly, the convex and concave surfaces of the spring contacts of two adjacent terminal modules 31 are arranged opposite each other. The spring contact preload structure at both ends of the terminal module 31 can increase the preload of the spring contacts, increase the holding force of the terminals, generate and maintain the pressure on the contact surfaces of the spring contacts, form a stable contact, and thus create a conductive path between the connectors.

[0047] Terminal modules 31 are arranged side-by-side in the housing, but there is a certain distance of misalignment between adjacent terminal modules 31, which can effectively reduce crosstalk. The first sub-housing 301 and the second sub-housing 302 have a centrally symmetrical structure. The upper and lower ends of the first sub-housing 301 and the second sub-housing 302 are respectively provided with guide grooves and guide posts. The housing of the connector on the board is also provided with guide grooves and guide posts. When assembling the stacked connector unit 30, the guide groove and guide post at the lower end of the first sub-housing 301 correspond to and cooperate with the guide groove and guide post at the upper end of the second sub-housing 302. When the stacked connector unit 30 is inserted into the connector on the board, the guide groove and guide post of the stacked connector unit 30 can be used to cooperate with the guide groove and guide post of the connector on the board. Both ends of the stacked connector unit 30 can be inserted into the connector on the board and reliable contact can be guaranteed.

[0048] In other embodiments, the connector end on the first board can be configured as a pin structure, the connector end on the second board can be configured as a socket structure, one end of the two connector ends of the stacked connector unit is a socket structure and the other end is a pin structure, the pin structure of the connector on the first board is the same as the pin structure of the stacked connector unit, the socket structure of the connector on the second board is the same as the socket structure of the stacked connector unit, the pin structure of the connector on the first board is adapted to the socket structure of the stacked connector unit, and the socket structure of the connector on the second board is adapted to the pin structure of the stacked connector unit.

[0049] Embodiment 2 of the mezzanine connector assembly of this utility model:

[0050] The mezzanine connector assembly in this embodiment differs from the mezzanine connector assembly in Embodiment 1 above in that the spacing between the two circuit boards is different, thus requiring a different number of stacked connector units. Figure 10 As shown, in this embodiment, the distance between the first circuit board 10 and the second circuit board 20 is increased by one unit compared to Embodiment 1. Correspondingly, one stacking connector unit 30 is added. The stacking connector group of the mezzanine connector assembly in this embodiment includes two stacking connector units 30. Each stacking connector unit 30 has the same specifications. The two stacking connector units 30 are plugged in. The adjacent plug ends of the two stacking connector units 30 are plugged in, and the opposite plug ends constitute the two farthest plug ends of the stacking connector group. The two farthest plug ends of the stacking connector group are plugged in to the connector 11 on the first board and the connector 21 on the second board, respectively. Specifically, the upper plug end of the upper stacking connector unit 30 is plugged in to the connector 11 on the first board, the lower plug end is plugged in to the upper plug end of the lower stacking connector unit 30, and the lower plug end of the lower stacking connector unit 30 is plugged in to the connector 21 on the second board. The stacking connector unit 30 has a set unit height to change the stacking height of the mezzanine connector assembly to adapt to the distance between the interconnecting two circuit boards when using different numbers of stacking connector units 30.

[0051] The stacked connector assembly is formed by combining stacked connector units 30. Each stacked connector unit 30 is sequentially inserted and connected to the connectors on the two boards to stack between two parallel interconnected circuit boards. The stacked connector unit 30 has a set unit height. For every unit increase in the distance between the two interconnected circuit boards, one stacked connector unit 30 is added for matching. The unit increase in the distance between the two circuit boards matches the unit height of the stacked connector unit 30. Therefore, the change in the distance between the two circuit boards can be adapted by adjusting the number of stacked connector units 30. Using different numbers of stacked connector units 30 can change the stacking height of the mezzanine connector assembly to adapt to the distance between the two interconnected circuit boards. By using a single specification of stacked connector unit 30 and changing the number of units, various distances between the two boards can be supported, eliminating the need to manufacture many connectors of different heights, which helps to reduce production costs.

[0052] In other embodiments, when the distance between the first circuit board and the second circuit board is larger, more than three stacked connector units can be combined as needed.

[0053] In other embodiments, the connector end on the first board can be configured as a pin structure, and the connector end on the second board can be configured as a socket structure. One end of the two connector ends of the stacked connector unit is a socket structure and the other end is a pin structure. The pin structure of the connector on the first board is the same as the pin structure of the stacked connector unit, and the socket structure of the connector on the second board is the same as the socket structure of the stacked connector unit. The pin structure of the connector on the first board is adapted to the socket structure of the uppermost stacked connector unit, and the socket structure of the connector on the second board is adapted to the pin structure of the lowermost stacked connector unit. The two adjacent stacked connector units are connected through their corresponding socket structures and pin structures.

[0054] Embodiment of the stacked connector unit of this utility model:

[0055] The stacked connector unit in this embodiment is the same as the stacked connector unit in the above-described mezzanine connector assembly embodiment, and will not be described again here.

[0056] Embodiments of the data server of this utility model:

[0057] The data server includes a mezzanine connector assembly. There are at least two types of mezzanine connector assemblies, each with a different number of stacked connector units, but the stacked connector units of the different mezzanine connector assemblies have the same specifications. One type of mezzanine connector assembly has the same structure as Embodiment 1 described above, and the other type has the same structure as Embodiment 2 described above; further details will not be provided here.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sandwich connector assembly, characterized by The stack connector set includes two board connectors for connecting with two circuit boards respectively, and the stack connector set includes at least two stack connector units (30) having two plug-in ends arranged oppositely, adjacent two stack connector units are plugged and the most distant two plug-in ends of the stack connector set are plugged with the two board connectors respectively, or the stack connector set includes one stack connector unit (30) and the two plug-in ends of the stack connector unit (30) are plugged with the two board connectors respectively.

2. The mezzanine connector assembly of claim 1, wherein, The two plug-in ends of the stack connector unit (30) and the plug-in ends of the two board connectors are arranged centrally symmetrically, the plug-in ends of the stack connector unit (30) are adapted to be plugged with the plug-in ends of the board connectors or the corresponding plug-in ends of another stack connector unit (30).

3. The mezzanine connector assembly of claim 1 or 2, wherein, The stack connector unit (30) includes a housing and terminal modules (31) mounted in the housing, the terminal modules (31) include insulators (311) and terminals fixed in the insulators (311), and each connector is formed in conduction by the terminals.

4. The mezzanine connector assembly of claim 3, wherein, The housing includes two split housings arranged oppositely, the insulators (311) of the terminal modules (31) have two clamping structures respectively clamped with the two split housings, and the clamping directions of the two clamping structures are opposite.

5. The mezzanine connector assembly of claim 3, wherein, The terminals of the terminal modules (31) include signal terminals (312), the signal terminals (312) are arranged in pairs to form differential pairs, and the insulators (311) of the terminal modules (31) have shielding sheets (314) corresponding to the differential pairs on at least one side in the thickness direction.

6. A stack connector unit, characterized by, The stack connector unit (30) has two plug-in ends arranged oppositely, one of the two plug-in ends is used for plugging with one of the board connectors or an adjacent stack connector unit, and the other is used for plugging with the other board connector or an adjacent stack connector unit, and the stack connector unit (30) has a set unit height to change the stacking height of the mezzanine connector assembly when different numbers of stack connector units are used to adapt to the spacing of the two circuit boards to be connected.

7. The stacked connector unit of claim 6, wherein, The stack connector unit (30) includes a housing and terminal modules (31) mounted in the housing, the terminal modules (31) include insulators (311) and terminals fixed in the insulators (311), and each connector is formed in conduction by the terminals.

8. The stacked connector unit of claim 7, wherein, The housing includes two split housings arranged oppositely, the insulators (311) of the terminal modules (31) have two clamping structures respectively clamped with the two split housings, and the clamping directions of the two clamping structures are opposite.

9. The stacked connector unit of claim 6 or 7 or 8, characterized in that, The terminals of the terminal modules (31) include signal terminals (312), the signal terminals (312) are arranged in pairs to form differential pairs, and the insulators (311) of the terminal modules (31) have shielding sheets (314) corresponding to the differential pairs on at least one side in the thickness direction.

10. A data server, characterized by The sandwich connector assembly according to any one of claims 1-5, wherein the sandwich connector assembly is provided with at least two different sandwich connector assemblies having different numbers of stacked connector units (30), and each of the stacked connector units has the same specification.

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