阅读说明：本技术 一种用于电气设备的地埋系统 (Underground system for electrical equipment ) 是由 郭俊浩 周东 潘米牙 赵永席 朱栋栋 朱发德 廖长春 于 2018-06-07 设计创作，主要内容包括：本发明提供了一种用于电气设备的地埋系统,包括地埋箱,所述地埋箱内置支撑框架,所述支撑框架结构设计合理,便于拆卸和安装,且支撑强度大；当所述的地埋箱置于地下时,可以提高箱体承压强度,高达2吨以上；由于所述支撑框架可拆卸,故有利于运输,较现有技术中只由厚重的金属材质的箱体和箱盖组成的地埋箱,其具有质量较轻,易于运输和移动较为方便。所述地埋箱中的箱体与箱盖通过密封垫圈和/或槽体结构密封连接,其密封等级可以达到IP67以上；且其整体美观、且具有防潮防水防尘的特性,耐腐蚀耐高湿低温的功能；所述箱体和箱盖易于加工,尺寸不受加工条件的限制,有效减低了生产成本。(The invention provides an underground system for electrical equipment, which comprises an underground box, wherein a supporting frame is arranged in the underground box, the supporting frame is reasonable in structural design, convenient to detach and install and high in supporting strength; when the underground box is arranged underground, the bearing strength of the box body can be improved to more than 2 tons; because the supporting frame can be dismantled, so be favorable to the transportation, bury the case than only comprising the box and the case lid of the heavy metal material among the prior art, it has the quality lighter, and it is comparatively convenient easily to transport and remove. The box body and the box cover in the underground box are in sealing connection through a sealing gasket and/or a groove body structure, and the sealing grade can reach more than IP 67; the integral appearance is beautiful, the moisture-proof, waterproof and dustproof characteristics are realized, and the functions of corrosion resistance, high humidity resistance and low temperature resistance are realized; the box body and the box cover are easy to process, the size is not limited by processing conditions, and the production cost is effectively reduced.)

1. The buried box is characterized by comprising a box body (1), a box cover (2) and a supporting frame (6); the supporting frame (6) is arranged in the box body (1) and is attached to the inner surfaces of the box body (1) and the box cover (2); the box body (1) and the box cover (2) are made of plastics, and the supporting frame (6) is made of metal.

2. Buried box according to claim 1, characterized in that said supporting frame (6) comprises:

The device comprises an upper frame (61), a lower frame (62), a cross beam (63), a first side bracket (64), a second side bracket (64 '), a first outer barrier strip (65) and a second outer barrier strip (65');

The upper frame (61) and the lower frame (62) are arranged in parallel;

the first side bracket (64) comprises a bottom edge and two side edges which are perpendicular to the bottom edge; the second side bracket (64') comprises a bottom edge and two side edges which are perpendicular to the bottom edge;

the first side bracket (64) and the second side bracket (64') are arranged between the upper frame (61) and the lower frame (62) in parallel along the vertical direction and are fixedly connected with the upper frame (61) and the lower frame (62);

The cross beam (63) is arranged above the lower frame (62) and is fixedly connected with the bottom edges of the first side bracket (64) and the second side bracket (64');

The first outer baffle strip (65) is fixedly connected with the side edge of one side of the first side bracket (64) and the side edge of the same side of the second side bracket (64'); the second outer stop strip (65 ') is fixedly connected with the other side edge of the first side bracket (64) and the same side edge of the second side bracket (64').

3. buried box according to claim 2, characterized in that said upper frame (61) is a quadrangular frame structure; at least one transverse reinforcing rib and/or at least one longitudinal reinforcing rib are arranged in the upper frame (61).

preferably, the lower frame (62) comprises two parallel outer frames and a reinforcing rib vertically arranged between the outer frames. Preferably, the number of the reinforcing ribs may be one or more, and when a plurality of reinforcing ribs are provided, the plurality of reinforcing ribs are arranged in parallel.

Preferably, the first side bracket (64) further comprises at least one transverse reinforcing rib parallel to the bottom edge; if the number of the transverse reinforcing ribs is multiple, the plurality of transverse reinforcing ribs are arranged in parallel; the second side bracket (64') also comprises at least one transverse reinforcing rib parallel to the bottom edge; if the transverse reinforcing ribs are arranged, the transverse reinforcing ribs are arranged in parallel.

preferably, the number of the first outer bars (65) is one or more, and when the number of the first outer bars (65) is multiple, the first outer bars (65) are arranged in parallel; the number of the second outer bars (65 ') is one or more, and when the number of the second outer bars (65 ') is multiple, the plurality of the second outer bars (65 ') are arranged in parallel.

Preferably, the number of the cross members (63) is one or more, and when there are a plurality of the cross members (63), the plurality of the cross members are arranged in parallel.

4. The buried box according to any one of claims 1-3, characterized in that the end face of the box body (1) connected with the box cover (2) is provided with a first bolt hole (4) and a first sealing washer (3), and a bolt (5) passes through the first bolt hole (4) and the first sealing washer (3) to fixedly connect the box body (1) with the box cover (2);

Or the end face of the box body (1) connected with the box cover (2) is provided with a second bolt hole (41), a first clamping groove (91), a second clamping groove (92), a second sealing washer (31) and a third sealing washer (32); the first clamping groove (91) and the second clamping groove (92) are arranged along the periphery of the end face, connected with the box cover (2), of the box body (1), the first clamping groove (91) and the second clamping groove (92) are respectively arranged on two sides of the second bolt hole (41), the first clamping groove (91) is matched with the second sealing washer (31), and the second clamping groove (91) is matched with the third sealing washer (32); and the bolt (5) passes through the second bolt hole (41) to fixedly connect the box body (1) and the box cover (2).

Preferably, the distance between the two adjacent second bolt holes is less than or equal to 220 mm.

5. Buried box according to any of claims 1-4, characterized in that the side walls of the box (1) are provided with an air inlet (9) and an air outlet (10); the buried box also comprises a buried detection and monitoring system, wherein the detection and monitoring system comprises a sensor, a control system, an air inlet pipe (12), an air outlet pipe (12) and a fan (13);

the air inlet (9) is communicated with an air inlet pipe (12); the air outlet (10) is communicated with an air outlet pipe (12); the fan (13) is connected with the inlet end of the air inlet pipe (12) or the outlet end of the air outlet pipe (12); the fan (13) is connected with the control system;

The sensor comprises at least one of a temperature sensor, an acidity sensor and a humidity sensor (14);

the sensor is connected with the control system; and the control system controls the opening and closing of the fan according to at least one of the acidity value, the temperature value and the humidity value detected by the sensor.

6. Buried box according to any of claims 1 to 5, characterized in that said sensor comprises an acidity sensor (14), said acidity sensor (14) being arranged inside said buried box, said acidity sensor (14) being intended to detect the acidity of the environment inside the box (1); the acidity sensor (14) is connected with a control system; the control system controls the opening and closing of the fan (13) according to the acidity value in the box body (1).

preferably, the sensor further comprises a temperature sensor; the temperature sensor is arranged in the box body (1) and used for detecting the temperature of the environment in the box body (1); the temperature sensor is connected with the control system, and the control system controls the opening and closing of the fan (13) according to the temperature in the box body (1).

Preferably, the sensor further comprises an in-tank temperature sensor (20) and an out-tank temperature sensor (20'); the temperature sensor (20) in the box body is arranged in the box body (1) and used for detecting the temperature of the environment in the box body (1); the external temperature sensor (20') is arranged in the environment outside the box body (1) and is used for detecting the temperature of the environment outside the box body (1); the temperature sensor (20) in the box body and the temperature sensor (20') outside the box body are both connected with a control system, and the control system controls the opening and closing of the fan (13) according to the temperature in the box body (1) and the temperature difference between the inside and the outside of the box body (1).

preferably, the sensor further comprises a humidity sensor; the humidity sensor is arranged in the box body (1) and used for detecting the humidity of the environment in the box body (1); the humidity sensor is connected with the control system, and the control system controls the opening and closing of the fan (13) according to the humidity in the box body (1).

Preferably, the sensor further comprises a humidity sensor (21) inside the box body and a humidity sensor (21') outside the box body; the humidity sensor (21) in the box body is arranged in the box body (1) and used for detecting the humidity of the environment in the box body (1); the external humidity sensor (21') is arranged in the environment outside the box body (1) and is used for detecting the humidity of the environment outside the box body (1); the humidity sensor (21) in the box body and the humidity sensor (21') outside the box body are both connected with the control system, and the control system controls the opening and closing of the fan (13) according to the humidity in the box body (1) and the humidity difference between the inside and the outside of the box body (1).

Preferably, the sensor further comprises a pressure sensor, the pressure sensor is arranged inside the box body (1), and the pressure sensor is connected with a control system; the pressure sensor is used for detecting the pressure applied to the bottom of the box body (1) or the box cover (2), and the control system transmits signals according to the applied pressure.

preferably, the pressure sensor is arranged at the bottom of the box cover (2), the pressure sensor is used for detecting the pressure applied to the box cover (2), and the control system transmits signals according to the pressure applied.

Preferably, the pressure sensor is arranged at the top of the box cover (2), the pressure sensor is used for detecting the pressure applied to the box cover (2), and the control system transmits signals according to the pressure applied.

Preferably, the pressure sensor is arranged inside the box body (1) and close to the bottom of the box body (1), the pressure sensor is used for detecting the pressure applied to the bottom of the box body (1), and the control system transmits signals according to the pressure applied.

Preferably, the control system comprises a timing control for controlling the opening and closing of the fan (13).

Preferably, the detection and monitoring system further comprises a fan frame (19) for fixing the fan (13) and/or for fixing the air inlet pipe (11) and the air outlet pipe (12).

7. a buried box according to any one of claims 1 to 6, characterized in that a dehumidifying screen is provided in the inlet pipe (12) to ensure that the gas entering the buried box is dry gas.

Preferably, the air outlet pipe (12) is provided with an air check valve for preventing outside air from reversely flowing into the box body (1).

Preferably, an air check valve is arranged on one side of the outlet end close to the air outlet pipe (12).

Preferably, a filter screen is arranged at the outlet end of the air outlet pipe (12).

Preferably, the outlet end of the outlet pipe (12) is opened downwards.

8. Buried box according to any of claims 1-7, characterized in that the plastic of which the box body (1) and the box cover (2) are made is a polypropylene composite; the polypropylene composite material comprises the following raw material components in parts by weight based on 100 parts of the composite material:

9. The buried box of claim 8, wherein the polypropylene is one of homo-polypropylene, co-polypropylene or a combination of homo-polypropylene and co-polypropylene. Preferably, the polypropylene is a combination of homo-polypropylene and co-polypropylene, wherein the weight ratio of homo-polypropylene to co-polypropylene is 2-8:1, preferably 3-5.5: 1.

Preferably, the homopolypropylene preferably has a molecular weight of 5-15 ten thousand, preferably 5-10 ten thousand, and a melt index (MFI) of 2-5g/10 min.

Preferably, the copolymerized polypropylene is preferably an ethylene block copolymerized polypropylene in which the ethylene content (mass) is 5 to 10%, the molecular weight is 10 to 20 ten thousand, preferably 10 to 15 ten thousand, and the MFI is 20 to 30g/10 min.

Preferably, the high density polyethylene can be a high density polyethylene with a weight average molecular weight of more than 10 ten thousand, preferably a high density polyethylene with a high molecular weight, preferably with a weight average molecular weight of more than 100 ten thousand, preferably 300-600 ten thousand, and an MFI of 0.2-2.5g/10 min.

Preferably, the ethylene propylene diene monomer is a copolymer of ethylene, propylene and a third monomer, and the ethylene propylene diene monomer is preferably a copolymer of ethylene and propylene in a molar ratio of 50-65: 35-50 of ethylene propylene diene monomer, preferably the molar ratio of ethylene to propylene is 60-65: 35-40.

Preferably, the fine silica powder is a powder having an average particle size of less than 30 microns, preferably a molten state fine silica powder having an average particle size of 16 to 18 microns.

preferably, the fine silica powder is pretreated with a coupling agent such as a silane coupling agent or a titanate coupling agent.

preferably, the composite material can further contain functional additives such as an antioxidant, a stabilizer and a mildew preventive. The functional additive is generally used in an amount of 1 wt% or less, preferably 0.5 wt% or less, of the composite material.

10. The underground cabinet of claim 9, wherein the polypropylene is a combination of homo-polypropylene and ethylene block co-polypropylene in a weight ratio of 3-5.5: 1; the high-density polyethylene is the high-density polyethylene with the molecular weight of 300-; the ethylene propylene diene monomer is ethylene propylene diene monomer with the ethylene propylene molar ratio of 60-65: 35-40; the silicon micropowder is pretreated by a silane coupling agent and has a particle size of 16-18 microns.

Technical Field

The invention belongs to the technical field of underground electrical equipment, and particularly relates to an underground system for electrical equipment.

background

with the wide development and use of batteries, especially storage batteries, in various fields, the tool for loading the storage batteries also needs to be developed and designed, and currently known electrical equipment such as the storage batteries are mostly stored in an overground box body, which indirectly causes contradiction between the aspects of water resistance, heat dissipation, air exhaust and the like, and has the risk of being easily stolen. Today, a small number of base stations, which are partly in the province, start to adopt an underground box structure. However, the closed box body of the underground box disclosed at present is rough and crude in work, adopts steel products, is not acid-resistant and alkali-resistant, is easy to corrode and rust and is easy to enter water; it is difficult to meet the long-term use requirement. And part of the underground boxes are designed by adopting an integral structure of simple steel, and although the requirement on sealing performance can be met, the prepared underground boxes have the defects of heavy weight, large volume, difficult transportation and the like due to the large specific gravity of the steel.

Polypropylene (PP) material is one of five common plastic materials, has excellent comprehensive performance, good chemical stability and better molding processability, and has been developed into one of the synthetic resins with the largest yield, the largest brand and the widest application at present due to abundant raw materials and low price. The development of new high performance PP materials has become a hot spot in recent years. However, the polypropylene material is a non-polar polymer, and the low-temperature performance, the aging performance, the molding shrinkage performance, the antistatic performance and the like of the polypropylene material are poor, so that the further application of the polypropylene material is limited.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the underground box for the electrical equipment, which is simple in structure, high in pressure-bearing strength, detachable, resistant to acid and alkali corrosion, waterproof and good in sealing performance, and integrates multiple functions.

In a first aspect of the present invention, there is provided an underground tank having the following structure:

A buried box comprises a box body, a box cover and a supporting frame; the supporting frame is arranged in the box body and is attached to the inner surfaces of the box body and the box cover; the case body and the case cover are made of plastic, and the support frame is made of metal.

According to the invention, the support frame comprises:

The device comprises an upper frame, a lower frame, a cross beam, a first side bracket, a second side bracket, a first outer stop strip and a second outer stop strip;

The upper frame and the lower frame are arranged in parallel;

The first side bracket comprises a bottom edge and two side edges which are perpendicular to the bottom edge; the second side bracket comprises a bottom edge and two side edges which are perpendicular to the bottom edge;

The first side bracket and the second side bracket are arranged between the upper frame and the lower frame in parallel along the vertical direction and are fixedly connected with the upper frame and the lower frame;

The cross beam is arranged above the lower frame and is fixedly connected with the bottom edge of the first side bracket and the bottom edge of the second side bracket;

The first outer stop bar is fixedly connected with the side edge of one side of the first side bracket and the side edge of the same side of the second side bracket; the second outer stop bar is fixedly connected with the side edge of the other side of the first side support and the side edge of the same side of the second side support.

According to an embodiment of the invention, the fixed connection is a screw fixed connection.

According to an embodiment of the present invention, the upper frame has a quadrangular frame structure; preferably, at least one transverse reinforcing rib and/or at least one longitudinal reinforcing rib are arranged in the upper frame.

According to the embodiment of the invention, the upper frame is prepared by welding a square tube or a flat tube, and the vertex of the upper frame is provided with a screw hole for screwing the first side bracket and the second side bracket. The upper frame may be, for example, a rectangular frame structure or a square frame structure obtained by square tube or flat tube welding.

According to an embodiment of the present invention, the lower frame includes two parallel outer frames and a reinforcing rib vertically disposed between the outer frames. Preferably, the number of the reinforcing ribs may be one or more, and when a plurality of reinforcing ribs are provided, the plurality of reinforcing ribs are arranged in parallel.

According to the embodiment of the invention, the lower frame is prepared by welding a square tube or a flat tube, the two ends of one outer frame are provided with the first connecting parts, the two ends of the other outer frame are provided with the second connecting parts, and the first connecting parts and the second connecting parts are provided with screw holes for screwing the first side bracket and the second side bracket.

according to an embodiment of the present invention, the first and second connection parts may extend upward in a vertical direction.

According to the embodiment of the invention, the first connecting part is used for connecting one side edge of the first side bracket and the same side edge of the second side bracket; the second connecting part is used for connecting the other side edge of the first side support and the same side edge of the second side support.

According to an embodiment of the present invention, the first side bracket further comprises at least one transverse reinforcing rib parallel to the bottom edge; if the transverse reinforcing ribs are arranged, the transverse reinforcing ribs are arranged in parallel.

According to an embodiment of the present invention, the second side bracket further comprises at least one transverse reinforcing rib parallel to the bottom edge; if the transverse reinforcing ribs are arranged, the transverse reinforcing ribs are arranged in parallel.

According to an embodiment of the invention, the first side bracket and the second side bracket are prepared by square tube or flat tube welding. Screw holes are respectively formed in the bottom edge of the first side support and the bottom edge of the second side support and used for being in threaded connection with the cross beam; and screw holes are respectively formed in the side edge of the first side support and the side edge of the second side support and used for screwing the lower frame, the first outer stop strip and the second outer stop strip.

according to the embodiment of the invention, the first outer barrier strip and the second outer barrier strip are both made of square tubes or flat tubes, and the two ends of the first outer barrier strip are provided with third connecting parts, the two ends of the second outer barrier strip are provided with fourth connecting parts, and the third connecting parts and the fourth connecting parts are provided with screw holes for screwing the first side bracket and the second side bracket.

According to the embodiment of the present invention, the third connection portion and the fourth connection portion may extend upward in the vertical direction, or may extend downward in the vertical direction.

according to the embodiment of the invention, the third connecting part is used for connecting one side edge of the first side bracket and the same side edge of the second side bracket; the fourth connecting part is used for connecting the other side edge of the first side support and the same side edge of the second side support.

According to an embodiment of the present invention, the number of the first outer bars is one or more, and when the number of the first outer bars is plural, the plural first outer bars are arranged in parallel.

according to an embodiment of the present invention, the number of the second outer bars is one or more, and when there are a plurality of the second outer bars, the plurality of the second outer bars are arranged in parallel.

According to an embodiment of the invention, the cross beam is made of a square tube or a flat tube.

According to an embodiment of the present invention, the number of the cross members is one or more, and when there are a plurality of the cross members, the plurality of the cross members are arranged in parallel.

According to an embodiment of the present invention, the screw is a hexagonal screw; the screw is made of stainless steel or carbon steel subjected to surface rust prevention treatment and the like, and aims to prevent the screw from being corroded underground. And a sealing cap is arranged at the end part of the screw.

according to the embodiment of the invention, the side wall of the box body is provided with an air inlet and an air outlet;

according to the embodiment of the invention, the buried box further comprises a buried detection and monitoring system, wherein the detection and monitoring system comprises a sensor, a control system, an air inlet pipe, an air outlet pipe and a fan;

The air inlet is communicated with an air inlet pipe; the air outlet is communicated with the air outlet pipe; the fan is connected with the inlet end of the air inlet pipe or the outlet end of the air outlet pipe; the fan is connected with the control system;

the sensor comprises at least one of a temperature sensor, an acidity sensor, and a humidity sensor;

The sensor is arranged in the underground box and/or outside the underground box and is used for detecting at least one of acidity of the environment in the box body, humidity of the environment in the box body, temperature of the environment in the box body, humidity of the environment in the box body and outside the box body and temperature of the environment in the box body and outside the box body;

The sensor is connected with the control system; and the control system controls the opening and closing of the fan according to at least one of the acidity value, the temperature value and the humidity value detected by the sensor.

According to an embodiment of the present invention, the sensor comprises an acidity sensor disposed inside the buried box, the acidity sensor being for detecting acidity of the environment inside the box; the acidity sensor is connected with the control system; and the control system controls the opening and closing of the fan according to the acidity value in the box body.

according to an embodiment of the invention, the sensor further comprises a temperature sensor; the temperature sensor is arranged in the box body and used for detecting the temperature of the environment in the box body; the temperature sensor is connected with the control system, and the control system controls the opening and closing of the fan according to the temperature in the box body.

According to an embodiment of the present invention, the sensor further comprises an in-tank temperature sensor and an out-tank temperature sensor; the temperature sensor in the box body is arranged in the box body and used for detecting the temperature of the environment in the box body; the temperature sensor outside the box body is arranged in the environment outside the box body and used for detecting the temperature of the environment outside the box body; the temperature sensor in the box body and the temperature sensor outside the box body are both connected with the control system, and the control system controls the opening and closing of the fan according to the temperature in the box body and the temperature difference between the inside and the outside of the box body.

According to an embodiment of the invention, the sensor further comprises a humidity sensor; the humidity sensor is arranged in the box body and used for detecting the humidity of the environment in the box body; the humidity sensor is connected with the control system, and the control system controls the opening and closing of the fan according to the humidity in the box body.

According to an embodiment of the present invention, the sensor further comprises a humidity sensor inside the case and a humidity sensor outside the case; the humidity sensor in the box body is arranged in the box body and used for detecting the humidity of the environment in the box body; the humidity sensor outside the box body is arranged in the environment outside the box body and used for detecting the humidity of the environment outside the box body; humidity transducer in the box and humidity transducer outside the box all link to each other with control system, and control system controls opening and closing of fan according to the humidity in the box and the humidity difference inside and outside the box.

According to the embodiment of the invention, the sensor further comprises a pressure sensor, the pressure sensor is arranged inside the box body, and the pressure sensor is connected with the control system; the pressure sensor is used for detecting the pressure applied to the bottom of the box body or the box cover, and the control system transmits signals according to the pressure applied.

According to the embodiment of the invention, the pressure sensor is arranged at the bottom of the box cover and used for detecting the pressure applied to the box cover, and the control system transmits signals according to the applied pressure.

according to the embodiment of the invention, the pressure sensor is arranged on the top of the box cover, the pressure sensor is used for detecting the pressure applied to the box cover, and the control system transmits signals according to the applied pressure.

According to the embodiment of the invention, the pressure sensor is arranged inside the box body and close to the bottom of the box body, the pressure sensor is used for detecting the pressure applied to the bottom of the box body, and the control system transmits signals according to the pressure.

According to the embodiment of the invention, the control system comprises a timing control device which controls the opening and closing of the fan in a timing mode.

According to an embodiment of the present invention, the detecting and monitoring system further comprises a control cabinet for placing the control system.

According to the embodiment of the invention, the air inlet pipe is connected with the air inlet in a sealing mode through the leakproof joint.

According to the embodiment of the invention, the air inlet pipe is provided with the tee joint for connecting a cable into the control cabinet.

according to the embodiment of the invention, the air inlet pipe is provided with the dehumidification filter screen, or the fan port connected with the air inlet pipe is provided with the dehumidification filter screen, so that the air entering the underground box is ensured to be dry air.

According to the embodiment of the present invention, the intake pipe is composed of the straight pipe and the bent pipe, and can be designed reasonably according to the position where the buried box is installed and the layout around the buried box. Such as by design and placement of bends and straight tubes of different lengths. The connecting part of the air inlet pipe is hermetically connected through PVC glue.

According to the embodiment of the invention, the inlet end of the air inlet pipe is hermetically connected with the air outlet of the fan. Preferably, the inlet end of the air inlet pipe is connected with the air outlet of the fan in a sealing mode through glass cement.

According to the embodiment of the invention, the air outlet pipe is hermetically connected with the air outlet through the leak-proof joint.

according to the embodiment of the invention, the air outlet pipe is provided with an air check valve for preventing outside air from reversely flowing into the box body. Preferably, an air check valve is arranged on one side of the outlet end close to the air outlet pipe.

According to the embodiment of the invention, the outlet end of the air outlet pipe is provided with a filter screen for preventing mosquitoes from entering the box body.

According to the embodiment of the invention, the outlet end of the air outlet pipe is opened downwards for preventing rainwater from entering.

According to the embodiment of the present invention, the outlet pipe is composed of the straight pipe and the bent pipe, and can be designed reasonably according to the position where the buried box is arranged and the layout around the buried box. Such as by design and placement of bends and straight tubes of different lengths. The joint of the air outlet pipe is hermetically connected through PVC glue.

According to an embodiment of the present invention, the detecting and monitoring system further includes a blower frame for fixing the blower and/or for fixing the air inlet pipe and the air outlet pipe.

In the invention, the acidity sensor can detect the acidity of the environment in the underground box, and the control system controls the on or off of the fan according to the acidity value; when the detected acidity value exceeds a set threshold value, air enters the underground box from the air inlet pipe through the air inlet under the drive of the fan, and the gas in the underground box is discharged out of the underground box from the air outlet pipe, so that the replacement of the gas in the underground box is realized; the acidity sensor continuously detects the acidity in the box body, and when the acidity is lower than a set threshold value, the control system controls the fan to be turned off according to the acidity value.

in the invention, the temperature sensor in the box body can detect the temperature in the box body, and the temperature sensor outside the box body can detect the temperature of the environment outside the box body; the control system controls the opening or closing of the fan according to the temperature in the box body and the temperature difference between the environment in the box body and the environment outside the box body; for example, when the temperature inside the box body reaches a set maximum temperature value and the temperature difference between the inside and the outside of the box body is greater than a set threshold value, the fan is started to perform air exchange treatment on the inside of the box body, so that the temperature difference inside and outside the box body is smaller than the set threshold value, and the working environment of the electrical equipment is reached.

in the invention, the humidity sensor in the box body can detect the humidity in the box body, and the environment humidity sensor outside the box body can detect the humidity in the environment outside the box body; the control system controls the opening or closing of the fan according to the humidity in the box body and the humidity difference between the environment in the box body and the environment outside the box body; for example, when the humidity in the box body reaches a set maximum humidity value and the humidity difference between the inside and outside of the box body is greater than a set threshold, the fan is turned on to perform ventilation treatment on the inside and outside of the box body, so that the humidity inside and outside of the box body is less than the set threshold, and the working environment of the electrical equipment is reached.

in the invention, the pressure sensor is used for detecting the pressure applied to the box body, when the pressure applied to the box body changes, the control system transmits a signal to an output end, such as a network terminal and the like, according to the change condition of the pressure applied to the box body, and a user can obtain information through the network terminal.

in the invention, when the fan is connected with the inlet end of the air inlet pipe, the air outlet of the fan is hermetically connected with the air inlet pipe, and the air blown out by the fan enters the buried box through the air inlet pipe; when the fan is connected with the outlet end of the air outlet pipe, the air suction opening of the fan is connected with the outlet end of the air outlet pipe in a sealing mode, and gas sucked by the fan enters the buried box through the air inlet pipe and is further sucked by the fan through the air outlet pipe.

According to the embodiment of the invention, the end face of the box body, which is connected with the box cover, is provided with a first bolt hole and a first sealing washer, and a bolt penetrates through the first bolt hole and the first sealing washer to fixedly connect the box body with the box cover.

According to the embodiment of the invention, the end face of the box body, which is connected with the box cover, is provided with a second bolt hole, a first clamping groove, a second sealing washer and a third sealing washer; the first clamping groove and the second clamping groove are arranged along the periphery of the end face where the box body and the box cover are connected with each other, the first clamping groove and the second clamping groove are respectively arranged on two sides of the second bolt hole, the first clamping groove is matched with the second sealing washer, and the second clamping groove is matched with the third sealing washer; and the bolt passes through the second bolt hole to fixedly connect the box body with the box cover.

According to the embodiment of the invention, the distance between two adjacent bolt holes is less than or equal to 220mm, such as 200 mm.

According to an embodiment of the present invention, the material of the bolt is plastic, which may be plastic conventionally used by those skilled in the art, and exemplarily, the plastic is polypropylene composite material.

According to an embodiment of the present invention, the material of the square tube or the flat tube is stainless steel or carbon steel subjected to surface rust prevention treatment.

according to an embodiment of the invention, the surface of the support frame is coated with a corrosion-resistant material, for example by a plastic and/or paint spraying process.

According to an embodiment of the present invention, the plastic of which the box body and the box cover are made may be a plastic conventionally used by those skilled in the art, and illustratively, the plastic is a polypropylene composite material.

In a second aspect of the invention, a polypropylene composite material for making the box body and the box cover of the buried box is provided. The polypropylene composite material comprises the following raw material components in parts by weight based on 100 parts of the composite material:

According to the embodiment of the present invention, the polypropylene may be one of homo-polypropylene, co-polypropylene, or a combination of homo-polypropylene and co-polypropylene. Preferably, the polypropylene is a combination of homo-polypropylene and co-polypropylene, wherein the weight ratio of homo-polypropylene to co-polypropylene is 2-8:1, preferably 3-5.5: 1.

According to an embodiment of the present invention, the homopolypropylene is preferably those having a molecular weight of 5 to 15 ten thousand, preferably 5 to 10 ten thousand, and a melt index (MFI) of 2 to 5g/10min (ASTM D1328 standard, 210 ℃, 12 kg).

according to an embodiment of the present invention, the co-polypropylene is preferably an ethylene block co-polypropylene having an ethylene content (mass) of 5-10%, a molecular weight of 10-20 ten thousand, preferably 10-15 ten thousand, and an MFI of 20-30g/10min (ASTM D1328 standard, 210 ℃, 12 kg).

According to an embodiment of the present invention, the high density polyethylene may be a high density polyethylene having a weight average molecular weight of 10 ten thousand or more, preferably a high density polyethylene having a high molecular weight, preferably 100 ten thousand or more, preferably 300-600 ten thousand, and an MFI of 0.2-2.5g/10min (ASTM D1328 standard, 190 ℃, 20 kg).

According to an embodiment of the present invention, the ethylene propylene diene monomer is a copolymer of ethylene, propylene and a third monomer, and the ethylene propylene diene monomer is preferably an ethylene propylene diene monomer having an ethylene propylene molar ratio of 50 to 65: 35-50 of ethylene propylene diene monomer, preferably the molar ratio of ethylene to propylene is 60-65: 35-40. When the proportion of propylene in the ethylene propylene diene monomer is higher, better processability, better low-temperature characteristic, better compression deformation and the like can be obtained. Common third monomers may be ethylidene norbornene, dicyclopentadiene, 1, 4-hexadiene, and the like.

According to an embodiment of the invention, the fine silica powder is a powder having an average particle size of less than 30 microns, preferably a fine silica powder in the molten state having an average particle size of 16 to 18 microns. Preferably, the fine silica powder of the present invention is pretreated with a coupling agent such as a silane coupling agent or a titanate coupling agent. The silica powder modified by the coupling agent increases the compatibility with polymers, reduces the system viscosity and improves the shock resistance.

According to an embodiment of the present invention, the composite material may further contain minor amounts of functional additives known in the art, such as antioxidants, stabilizers, mildewcides. The additives can inhibit the polypropylene macromolecular chain from breaking, adjust the melt flow index of the composite material, improve the processing technology and reduce the aging of the composite material due to the action of microorganisms. The antioxidant is, for example, phenols, phosphites; the mildewcide may be a phenolic compound (e.g., pentachlorophenol and its sodium salt), an organic sulfur compound (e.g., tetramethylthiuram disulfide), an organic tin compound (e.g., ditributyltin ether), or the like. The functional additive is generally used in an amount of 1 wt% or less, preferably 0.5 wt% or less, of the composite material.

According to an embodiment of the present invention, the polypropylene is a combination of homo-polypropylene and ethylene block co-polypropylene in a weight ratio of 3-5.5: 1; the high-density polyethylene is the high-density polyethylene with the molecular weight of 300-; the ethylene propylene diene monomer is ethylene propylene diene monomer with the ethylene propylene molar ratio of 60-65: 35-40; the silicon micropowder is pretreated by a silane coupling agent and has a particle size of 16-18 microns.

According to an embodiment of the present invention, the polypropylene: high density polyethylene: ethylene propylene diene monomer: the weight part ratio of the silicon micropowder is 42-48:20-25:2-4: 26-30.

the invention has the beneficial effects that:

The invention provides an underground box for electrical equipment, wherein a supporting frame is arranged in the underground box, the supporting frame is reasonable in structural design, convenient to detach and install and high in supporting strength; when the underground box is arranged underground, the bearing strength of the box body can be improved to more than 2 tons; because braced frame can dismantle, so be favorable to the transportation, just braced frame surface adopts the spraying plastics to handle and/or the processing of spraying paint, and the screw bolt adopts effective rust-resistant of stainless steel material. Compared with the buried box which only consists of the box body and the box cover made of heavy metal materials in the prior art, the buried box has the advantages of light weight, convenience in transportation and movement and the like.

the box body and the box cover in the underground box are in sealing connection through a sealing gasket and/or a groove body structure and matched with screws, and the sealing grade can reach over IP 67; the integral appearance is beautiful, the moisture-proof, waterproof and dustproof characteristics are realized, and the functions of corrosion resistance, high humidity resistance and low temperature resistance are realized; moreover, the box body and the box cover are easy to process, the size is not limited by processing conditions, and the production cost is effectively reduced.

The buried box also comprises a buried detection and monitoring system, the detection and monitoring system detects the temperature, the humidity and the acidity in the buried box, the air enters the box body from the air inlet pipe by utilizing the opening and closing of the fan, and the introduced air is ensured to be dry air through the dehumidification filter screen, so that the temperature, the humidity and the acidity in the buried box can be ensured to be within a safe range, and the service life of the battery is ensured. The detection and monitoring system also includes a pressure sensor for determining whether the electrical device is removed or stolen.

The box body and the box cover of the underground box are made of plastics, particularly are prepared from a polypropylene composite material, and when 25-32% of silica powder is added into the composite material, 20-30% of high-density polyethylene and 2-5% of ethylene propylene diene monomer are additionally added, the three materials achieve a synergistic interaction effect, so that the impact strength and the tensile strength of the polypropylene composite material are improved. When the cable is manufactured into an underground box for use, the cable has excellent insulating property, so that the operation is safe and reliable; because of good impact resistance, toughness and high strength, the buried box can bear larger ground pressure and is not easy to deform and age when being used; due to the function synergistic effect of the components, the paint can adapt to underground acid-base corrosion, high humidity and low temperature when being buried.

Drawings

fig. 1 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a support frame according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a support frame according to an embodiment of the present invention.

fig. 6 is a schematic structural diagram of an upper frame according to an embodiment of the present invention.

fig. 7 is a schematic structural diagram of a lower frame according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a buried box according to an embodiment of the present invention.

Detailed Description

[ preparation method of Polypropylene composite Material ]

the invention also provides a preparation method of the composite material, which comprises the following steps:

(1) Mixing polypropylene, high-density polyethylene, silica micropowder and ethylene propylene diene monomer according to a proportion, and stirring and blending in a mixing roll or a stirrer;

(2) Adding the mixture into an extruder to obtain a flaky melt.

In a preferred embodiment of the present invention, it is preferable that the step (1) is performed in a high-speed mixer, and the stirring and blending time is 10 minutes or less, for example, 3 to 5 minutes; the rotating speed of the high-speed mixing roll is controlled at 300-500 r/min;

In a preferred embodiment of the present invention, the processing temperature of the extruder in the step (2) is preferably 130-.

In a preferred embodiment of the present invention, the extruder is a twin-screw extruder, and the rotation speed of the twin-screw extruder in the step (2) is 200-300 r/min.

In a preferred embodiment of the present invention, the method for preparing the composite material further comprises: and (4) extruding the flaky melt in the step (3), shaping, cooling and shearing to prepare the plate. Preferably, this step is carried out in an injection molding machine or calender, the material thickness being 4 to 10mm, preferably 6. + -. 0.2 mm.

the preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.

in the description of the present invention, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and do not indicate or imply relative importance.