CN112462890A

CN112462890A - PXI shielding case and PXI backboard

Info

Publication number: CN112462890A
Application number: CN202011585983.1A
Authority: CN
Inventors: 王琪; 赵荣
Original assignee: Chengdu Daxton Technology Co ltd
Current assignee: Chengdu Daxton Technology Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-03-09

Abstract

The invention discloses a PXI shielding case which comprises a case body, wherein the case body comprises a plurality of plate bodies, a shielding strip is arranged at the joint part of the adjacent plate bodies, the shielding strip comprises a front piece and a rear piece, the top of the front piece is connected with the top of the rear piece through a bent part, and the bent part is sleeved on the edge of the plate body. The invention discloses a PXI backboard, a circuit board and at least eight groups of PXI slot positions arranged on the circuit board, wherein each group of PXI slot positions are arranged in a preset interval matrix and are connected through a bus. The invention can improve the electromagnetic shielding performance and the working frequency of PXI equipment.

Description

PXI shielding case and PXI backboard

Technical Field

The invention relates to the technical field of electronics, in particular to a PXI case and a PXI backboard.

Background

PXI (PCI extensions for Instrumentation, instrument system oriented PCI extension) is a robust PC-based measurement and automation platform promulgated by the PXI consortium. PXI combines the electrical bus characteristics of PCI (Peripheral Component interconnect) with the robustness, modularity, and Eurocard mechanical packaging characteristics of CompactPCI (compact PCI) to develop mechanical, electrical, and software specifications suitable for testing, measurement, and data acquisition applications. .

The shielding effect of the PXI case has great influence on the working performance and the working frequency of the PXI system, and the existing PXI case has the defect of the shielding performance.

Disclosure of Invention

The invention aims to provide a PXI case which can improve the electromagnetic shielding performance and the working frequency of PXI equipment.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

the invention discloses a PXI case which comprises a case body, wherein the case body comprises a plurality of plate bodies, a shielding strip is arranged at the joint part of the adjacent plate bodies, the shielding strip comprises a front piece and a rear piece, the top of the front piece is connected with the top of the rear piece through a bent part, and the bent part is sleeved on the edge of the plate body.

Preferably, the bottom of the front piece is lower than the bottom of the rear piece, the front piece comprises a plurality of shielding pieces which are arranged at intervals, the tops of the adjacent shielding pieces are integrally connected, and the lower parts of the shielding pieces are comb-shaped.

Further, the bottom of the shielding sheet is a backward turning part.

Furthermore, a pressing strip is installed on the inner side face of the plate body, a gap is reserved between the bottom of the pressing strip and the plate body, and the rotating portion is clamped in the gap.

Furthermore, the invention also comprises a panel connected with the box body, and a shielding strip is arranged at the connecting part of the panel and the plate body.

Furthermore, an air inlet is formed in the lower portion of the panel, an air outlet is formed in the upper portion of the side face, opposite to the panel, of the box body, an air inlet fan is arranged at the air inlet, a blowing fan is arranged at the top of the box body, and the wind direction of the blowing fan is perpendicular to the wind direction of the air inlet fan.

Preferably, the axis of the air inlet fan, the axis of the air blowing fan and the axis of the air outlet are located on the same plane, and the air inlet fan and the air blowing fan are both speed-regulating fans.

Further, the box body is provided with a power supply EMI filter.

Preferably, the PXI chassis is a 3U chassis.

The PXI backboard is suitable for the PXI case and comprises a circuit board and at least eight groups of PXI slot positions arranged on the circuit board, wherein the PXI slot positions are arranged in a preset interval matrix and are connected through a bus.

The invention has the following beneficial effects:

1. the invention adopts the shielding strip, improves the electromagnetic shielding performance and can improve the working frequency of the PXI equipment.

2. The heat dissipation mode of the invention adopts a design of sucking from front to back, and the clean cold air in the front is guided to the rear of the case by the centrifugal fan at the top of the case through the PXI module and is exhausted.

3. The invention is connected with an EMI filter at the input end of the power module to restrain external electromagnetic interference introduced from an alternating current power line so as to ensure that the module in the case obtains a stable and reliable working power supply.

Drawings

FIG. 1 is a partial schematic view of the present invention.

Fig. 2 is a front view of the shield plate;

FIG. 3 is a rear view of the shield blades;

FIG. 4 is a side view of a shield blade;

FIG. 5 is a schematic view of an air duct;

FIG. 6 is a schematic diagram of an EMI filter;

fig. 7 is a schematic structural diagram of a PXI backplane.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the invention discloses a PXI chassis which is a 3U chassis and includes a chassis body 1, wherein the chassis body 1 includes a plurality of plate bodies, and a shielding strip 2 is arranged at a joint portion of adjacent plate bodies.

As shown in fig. 2, 3 and 4, the shielding strip 2 includes a front sheet 21 and a rear sheet 22, the top of the front sheet 21 and the top of the rear sheet 22 are connected by a bending portion 23, and the bending portion 23 is sleeved on the edge of the plate body. The bottom of anter 21 is less than the bottom of back part 22, and anter 21 includes the shielding piece that a plurality of interval was arranged, and the top body coupling of adjacent shielding piece, the lower part of shielding piece are the pectination, are equipped with breach 211 between the broach. The bottom of the shield blades are rearward turns 212.

The inner side surface of the plate body is provided with a pressing strip, a gap is arranged between the bottom of the pressing strip and the plate body, and the rotating part 212 is clamped in the gap. The invention also comprises a panel connected with the box body, and a shielding strip 2 is arranged at the connecting part of the panel and the plate body.

As shown in fig. 5, an air inlet 5 is arranged at the lower part of the panel, an air outlet 4 is arranged at the upper part of the side surface of the box body 1 opposite to the panel, an air inlet fan is arranged at the air inlet 5, a blowing fan is arranged at the top part of the box body 1, the wind direction of the blowing fan is vertical to that of the air inlet fan, and the axis of the air inlet fan, the axis of the blowing fan and the axis of the air outlet are positioned on the same plane; the air inlet fan and the air blowing fan are both speed-regulating fans, and the air cooling effect of the box body 1 can be adjusted by regulating the rotating speeds of the air inlet fan and the air blowing fan.

As shown in fig. 6, the case 1 is mounted with a power supply EMI filter including a magnetic core, a series reactor, and a parallel capacitor.

As shown in fig. 7, the present invention further discloses a PXI backplane suitable for the PXI chassis, which includes a circuit board and at least eight groups of PXI slots disposed on the circuit board, wherein each group of PXI slots are arranged in a preset interval matrix, and the PXI slots are connected through a bus.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A PXI case comprises a case body, wherein the case body comprises a plurality of plate bodies, and is characterized in that: the joint portion of adjacent plate body is equipped with the shielding strip, the shielding strip includes anter and back part, the top of anter and the top of back part are passed through the flexion and are connected, the flexion suit is at the border of plate body.

2. The water storage apparatus of claim 1, wherein: the bottom of anter is less than the bottom of back part, and the anter includes the shielding piece that a plurality of interval was arranged, and the top of adjacent shielding piece is integrative to be connected, and the lower part of shielding piece is the pectination.

3. The PXI chassis of claim 2, wherein: the bottom of the shielding sheet is a backward rotary part.

4. The PXI chassis of claim 3, wherein: the inner side surface of the plate body is provided with a pressing strip, a gap is reserved between the bottom of the pressing strip and the plate body, and the rotating part is clamped in the gap.

5. The PXI chassis of any one of claims 1-4, wherein: the box body is characterized by further comprising a panel connected with the box body, and a shielding strip is arranged at the connecting portion of the panel and the plate body.

6. The PXI chassis of claim 5, wherein: the air inlet is arranged at the lower part of the panel, the air outlet is arranged at the upper part of the side surface of the box body opposite to the panel, the air inlet is provided with an air inlet fan, the top of the box body is provided with a blowing fan, and the wind direction of the blowing fan is perpendicular to that of the air inlet fan.

7. The PXI chassis of claim 6, wherein: the axis of the air inlet fan, the axis of the air blowing fan and the axis of the air outlet are located on the same plane, and the air inlet fan and the air blowing fan are both speed-regulating fans.

8. The PXI chassis of claim 1, wherein: the box body is provided with a power supply EMI filter.

9. The PXI chassis defined in any one of claims 6-8, wherein: the PXI case is a 3U case.

10. A PXI backplane adapted for use with the PXI chassis of claim 9, wherein: the device comprises a circuit board and at least eight groups of PXI slot positions arranged on the circuit board, wherein the PXI slot positions are arranged in a preset interval matrix and are connected through a bus.