A temperature control, humidity control and condensation prevention system for an electrical room with a cable trench

Abstract

A temperature control, humidity control and condensation prevention system for an electrical room with a cable trench, comprising an air inlet and an air supply outlet, an air duct between the air inlet and the air supply outlet, a fan installed in the air duct, a filter installed in the air duct between the air inlet and the fan, the air duct comprising an air inlet, an electrical room air supply duct, and a cable trench air supply duct, the air inlet being connected to the electrical room air supply duct and the cable trench air supply duct through the air inlet; the air supply outlet comprising an electrical room air supply outlet located on the electrical room air supply duct and a cable trench air supply outlet located on the cable trench air supply duct; the fan is controlled by an intelligent control system, and the intelligent control system is connected to a temperature and humidity sensor. The present invention can maintain the temperature and humidity balance of the three spaces, namely, the electrical cabinet, the electrical room, and the cable trench, contained in the electrical room with a cable trench, thereby preventing the occurrence of condensation in the electrical cabinet, dirty flashover, and other problems.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning in an electrical room with a cable trench, and in particular to a device specially used for air conditioning in an electrical room with a cable trench to achieve the purpose of controlling temperature, humidity and condensation. Background Art

[0002] At present, in some closed spaces such as large transformer stations, substations, high and low voltage switch rooms, etc., which are unmanned underground or on the ground, it is necessary to adjust the temperature and humidity of the electrical room. For example, in the technology published in 201010243443.5, a controllable low-speed airflow with a small air volume is used to supply air at the lower part of the electrical room, and exhaust air from the electrical room exhaust port at the upper part of the electrical room. The low-speed airflow maintains the minimum ventilation and cooling airflow required for the thermal balance of the electrical equipment in a certain temperature range. The temperature difference between the high and low parts of the electrical room causes the air to rise, and the fan drives the controllable air convection to compensate for the heat dissipation intensity increment required by the temperature change of the electrical equipment or the external environment. The above technology can effectively control the temperature and humidity in the electrical room, and avoid the influence of the temperature and humidity changes in the electrical room on the electrical equipment.

[0003] However, in electrical rooms with cable trenches, it is not enough to use only the above air conditioning method. In electrical rooms with cable trenches, electrical equipment is often installed in electrical cabinets, and electrical cabinets are generally installed directly above the cable trenches. When there is a cable trench in the electrical room, since the bottom of the electrical equipment is connected to the relatively humid and cold cable trench, the humid and cold air in the cable trench enters the electrical cabinet in some cases, often causing condensation on the inner and outer surfaces of the electrical cabinet, which may cause short circuits and flashovers. The condensation phenomenon is extremely destructive to the electrical system. Especially in the southern areas with high humidity, during the operation of electrical equipment, due to inadequate humidity control, condensation and flashovers cause more than 45% of the total failures. Therefore, the above temperature and humidity adjustment method needs to be further improved.

[0004] In an electrical room with a cable trench, to prevent condensation and flashover, the most important thing is to destroy the conditions for condensation. When the temperature and humidity inside the electrical cabinet reach a relative balance with the outside world, condensation is difficult to form. The cabinet body of the electrical cabinet placed in the electrical room is in contact with the indoor space of the electrical room, and the bottom of the electrical cabinet is connected to the cable trench at the bottom of the electrical room. To ensure the temperature and humidity balance between the inside of the electrical cabinet and the outside world, it is necessary to maintain the temperature and humidity balance of the three spaces inside the electrical cabinet, the electrical room, and the cable trench. This requires the design of an air conditioner that can maintain the temperature and humidity balance of the above three spaces to prevent condensation in the electrical cabinet. This can not only prevent the occurrence of destructive phenomena such as flashover and short circuit, but also extend the service life of the electrical cabinet. Summary of the invention

[0005] The object of the present invention is to provide an air conditioner to maintain the temperature and humidity balance of three spaces in an electrical room with a cable trench, namely, an electrical cabinet, an electrical room, and a cable trench, thereby preventing condensation, flashover, and other problems in the electrical cabinet.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0007] A temperature control, humidity control and anti-condensation system for an electrical room with a cable trench, comprising an air inlet and an air supply outlet, an air duct between the air inlet and the air supply outlet, a fan installed in the air duct, and a filtering device installed in the air duct between the air inlet and the fan. The air duct comprises an air inlet duct, an electrical room air supply duct, and a cable trench air supply duct, and the air inlet is connected to the electrical room air supply duct and the cable trench air supply duct through the air inlet duct; the air supply outlet comprises an electrical room air supply outlet located on the electrical room air supply duct and a cable trench air supply outlet located on the cable trench air supply duct; the fan is controlled by an intelligent control system, and the intelligent control system is connected to a temperature and humidity sensor.

[0008] In particular, the temperature and humidity sensors include an electrical room temperature and humidity sensor, a cable trench temperature and humidity sensor, and an air inlet temperature and humidity sensor; the electrical room temperature and humidity sensor is located in the electrical room, the cable trench temperature and humidity sensor is located in the cable trench, and the air inlet temperature and humidity sensor is located at the air inlet; the intelligent control system is connected to the electrical room temperature and humidity sensor, the cable trench temperature and humidity sensor, the air inlet temperature and humidity sensor, and the fan, and the control information of the intelligent control system comes from the electrical room temperature and humidity sensor, the cable trench temperature and humidity sensor, and the air inlet temperature and humidity sensor.

[0009] In particular, it also includes an air volume distributor for distributing the air volume of the electrical room air supply outlet and the cable trench air supply outlet; the fan is located in the air inlet duct; the air volume distributor is located at the front end of the junction of the electrical room air supply outlet and the cable trench air supply outlet; the air volume distributor is controlled by an intelligent control system, and the control signal of the intelligent control system comes from the electrical room temperature and humidity sensor and the cable trench temperature and humidity sensor.

[0010] In particular, it also includes a return air device, which is located on the air inlet duct between the air inlet and the fan; the return air device is controlled by an intelligent control system.

[0011] In particular, it also includes an electrical room air supply valve and a cable trench air supply valve. The electrical room air supply valve is installed in the electrical room air supply duct, and the cable trench air supply valve is installed in the cable trench air supply duct; the opening size of the electrical room air supply valve and the cable trench air supply valve is controlled by an intelligent control system, and the control signal of the intelligent control system comes from the electrical room temperature and humidity sensor and the cable trench temperature and humidity sensor.

[0012] In particular, the fan includes an electrical room air supply fan and a cable trench air supply fan. The electrical room air supply fan is located in the electrical room air supply duct, and the cable trench air supply fan is located in the cable trench air supply duct. The air supply volume of the electrical room air supply fan and the cable trench air supply fan is controlled by an intelligent control system.

[0013] In particular, it also includes an air inlet valve installed at the air inlet, and the opening size of the air inlet valve is controlled by the intelligent control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an application diagram of the present invention;

[0015] Figure 2 It is a structural diagram of the present invention;

[0016] Figure 3 It is a control part connection diagram of the present invention;

[0017] Figure 4 It is a three-dimensional diagram of a structural diagram of the present invention;

[0018] Figure 5 is another structural diagram of the present invention;

[0019] Figure 6 is another control part connection diagram of the present invention;

[0020] Figure 7 It is another structural diagram of the present invention;

[0021] Figure 8 is another control part connection diagram of the present invention;

[0022] right Figures 1 to 8 The symbols are explained as follows:

[0023] 1. Air inlet; 11. Air inlet duct; 111. Filter device; 112. Air inlet duct valve; 2. Electric room air outlet; 21. Electric room air outlet; 3. Cable trench air outlet; 31. Cable trench air outlet; 4. Fan; 41. Electric room air outlet fan; 42. Cable trench air outlet fan; 5. Intelligent control system; 6. Temperature and humidity sensor; 61. Air inlet temperature and humidity sensor; 62. Electric room temperature and humidity sensor; 63. Cable trench temperature and humidity sensor; 7. Air volume distributor; 71. Electric room air outlet valve; 72. Cable trench air outlet valve; 8. Return air device; 91. Electric room; 911. Electric room air inlet; 912. Electric room air outlet; 92. Space inside the electric cabinet; 921. High-voltage cabinet; 922. Transformer; 923. Low-voltage cabinet; 93. Cable trench; 931. Cable line; 103. Box. DETAILED DESCRIPTION

[0024] The principle of the present invention is as follows: To prevent condensation in the electrical cabinet, it is necessary to consider the installation of the electrical room in the prior art. The electrical room includes the electrical room and the cable trench 93 under the floor of the electrical room. The electrical cabinet is placed on the cable trench 93. The cable trench 93 exists as a channel for the cable lines 931 of the electrical equipment, and the electrical equipment is generally placed in the electrical cabinet. The cabinet body of the electrical cabinet is in contact with the indoor space of the electrical room, and the bottom of the electrical cabinet is connected to the cable trench 93. There are two conditions for the formation of condensation in the electrical cabinet, one is the high moisture content in the air, and the other is the sudden change in temperature between various positions. However, the cable trench 93 under the existing electrical room is often colder and wetter than the electrical room 91 due to the limitation of its location. The imbalance of temperature and humidity easily creates conditions for the formation of condensation inside the electrical cabinet. Maintaining the thermal and humid balance of the electrical room is not enough to prevent condensation in the electrical cabinet. The present invention introduces low-speed airflow into the electrical room and the cable trench at the same time, and uses an intelligent control system to control the air flow entering the electrical room and the cable trench with reference to the data of the temperature and humidity sensors, thereby achieving temperature and humidity control of all spaces around the electrical cabinet, so that the temperature and humidity of the space inside the electrical room 91, the space inside the cable trench 93, and the space inside the electrical cabinet are relatively balanced, thereby destroying the conditions for condensation and avoiding dirty flashover.

[0025] Combine the following Figures 1 to 8 Embodiments of the present invention will be described.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 This is an embodiment of the present invention.

[0027] like Figure 1 As shown, an electrical room temperature control and humidity control anti-condensation system with a cable trench includes an air inlet 1, an electrical room air supply 2, and a cable trench air supply 3. An air inlet 11, an electrical room air supply 21, and a cable trench air supply 31 are arranged between the air inlet 1 and the air supply. The air inlet 1 is connected to the electrical room air supply 21 and the cable trench air supply 31 through the air inlet 11. The air supply includes an electrical room air supply 2 located on the electrical room air supply 21 and a cable trench air supply 3 located on the lower electrical room air supply 21. A filter 111 is installed in the air inlet 11 between the air inlet 1 and the fan. In order to facilitate the installation and arrangement of the equipment, each air inlet, each air duct, fan, etc. can be placed in a box 103, and the box 103 can be divided into each air duct by the internal layout. The air inlet 1 is connected to the wall air inlet 102 of the electrical room; the electrical room air outlet 2 is connected to the electrical room 91; the cable trench air outlet 3 is connected to the cable trench 93. The above structure allows both the cable trench 93 and the electrical room 91 to be supplied with air through the same air source, thereby ensuring that the temperature and humidity of the two spaces are kept in a balanced state, and there will not be a large temperature and humidity difference between the two spaces, thus changing the relatively damp and cold state of the cable trench 93 compared to the electrical room.

[0028] It also includes an intelligent control system 5 and temperature and humidity sensors, the temperature and humidity sensors include an air inlet temperature and humidity sensor 61, an electrical room temperature and humidity sensor 62, and a cable trench temperature and humidity sensor 63; the electrical room temperature and humidity sensor 62 is located in the electrical room 91; the cable trench temperature and humidity sensor 63 is located in the cable trench 93; the air inlet temperature and humidity sensor 61 is used to detect the inlet air temperature and humidity, and can be installed in the air inlet space connected to the air inlet 1, and can also be installed in the air inlet duct 11.

[0029] like Figure 2 , Figure 3 , and also includes an air volume distributor 7 for distributing the air volume of the electrical room air supply outlet 2 and the cable trench air supply outlet 3; the air volume distributor 7 is located at the front end of the junction of the electrical room air supply outlet 2 and the cable trench air supply outlet 3; the air volume distributor 7 is controlled by the intelligent control system 5, and the control signal of the intelligent control system 5 comes from the electrical room temperature and humidity sensor 62 and the cable trench temperature and humidity sensor 63.

[0030] Figure 4 It is a way of layout and distribution in the box 103. The box 103 is placed in the electrical room 91. The box 103 can be divided into three parts: left, middle and right. The left and right sides are symmetrically distributed. The filter device 111 is installed on the left and right sides respectively. The air inlet 1 is set on both sides of the back of the filter device 111. The fan 4 is installed below the middle of the box 103. The intelligent control system 5 is installed in the middle of the box above the fan 4. The fan 4 has two air supply ports. The electrical room air supply port 21 is located at the front of the lower middle side of the box and leads to the electrical room 91. The cable trench air supply port 31 is located at the bottom side of the middle of the box and extends downward to the cable trench 93. The top of the middle of the box 103 is the return air device 8. This layout is just one of the ways. The layout can be made according to the structure of the box and the specific structure of the electrical room, such as adding multiple different air inlets to provide air with suitable temperature and humidity. The air supply outlets in the electrical room and the cable trench are designed to supply air into two spaces, the electrical room and the cable trench. They can also be supplied into any space in the electrical room or the cable trench or multiple different air supply outlets can be added to meet the needs of supplying air to various locations.

[0031] In order to more accurately control the temperature and humidity of each space in the electrical room, a return air device 8 can also be installed. The return air device 8 is located on the air inlet 11 between the air inlet 1 and the fan 4; the return air device 8 is controlled by the intelligent control system 5, and the intelligent control system 5 controls the return air device 8 according to the signals of the electrical room temperature and humidity sensor 62, the cable trench temperature and humidity sensor 63, and the air inlet temperature and humidity sensor 61. When the return air device 8 is completely closed, air can only enter from the air inlet 1, and when the return air device 8 is opened, part of the wind source will come from the air in the electrical room 91, which can set the air circulation system in the electrical room 91 to a partial internal circulation state.

[0032] In order to cooperate with the return air device 8, an air inlet valve 112 can also be installed. The air inlet valve 112 can be used to open and close the air inlet. The air inlet valve 112 is connected to the intelligent control system 5, and the intelligent control system 5 controls the air inlet valve 112 according to the signals of the electrical room temperature and humidity sensor 62, the cable trench temperature and humidity sensor 63, and the air inlet temperature and humidity sensor 61. That is, when the outdoor wind source encounters extreme climate, such as a sudden drop in temperature and a sudden rise in temperature and humidity, and a sudden change in temperature and humidity caused by heavy rain, if all air is introduced from the electrical room outside, it may cause the temperature and humidity in the electrical room 91 to be out of control, especially in the rainy season when the outdoor temperature and humidity are greater than the indoor temperature and humidity. In this case, the air inlet 11 should be partially cut off, and the return air device 8 should be opened, so that the internal air circulation is formed in the electrical room 91 and the cable trench 93, and the heat generated by the indoor electrical equipment is used to appropriately increase the room temperature and the cable trench temperature to increase the humidity content of the air, so that the humidity content of the air overflowing from the outdoors is greater than the humidity content of the incoming air, and the indoor and cable trench are kept dry.

[0033] Combine the following Figure 5 , Figure 6 Another embodiment of the present invention will be described.

[0034] The difference from the above embodiment is the air volume distribution method. This air volume distribution method does not use the air volume distributor 7, but includes an electrical room air supply valve 71 and a cable trench air supply valve 72. The electrical room air supply valve 71 is installed in the electrical room air supply duct 21, and the cable trench air supply valve 72 is installed in the cable trench air supply duct 31. The intelligent control system 5 controls the opening size of the electrical room air supply valve 71 and the cable trench air supply valve 72 according to the signals of the electrical room temperature and humidity sensor 62 and the cable trench temperature and humidity sensor 63. There are many air volume distribution methods, the purpose of which is to control the proportion of the air intake into the electrical room 91 and the cable trench 93 by controlling the ventilation diameter of the electrical room air supply duct 21 and the cable trench air supply duct 31. The air volume distributor can use an electrically controlled air valve, etc. There are many such products on the market.

[0035] Combine the following Figure 7 , Figure 8 Another embodiment of the present invention will be described.

[0036] The difference from the above embodiment lies in the different fan and air volume distribution method. The fan of this embodiment includes an electrical room air supply fan 41 and a cable trench air supply fan 42, wherein the electrical room air supply fan 41 is located in the electrical room air supply duct 21, and the cable trench air supply fan 42 is located in the cable trench air supply duct 31; the intelligent control system 5 controls the electrical room air supply fan 41 and the cable trench air supply fan 42 according to the signals of the electrical room temperature and humidity sensor 62, the cable trench temperature and humidity sensor 63, and the air inlet temperature and humidity sensor 61. In this embodiment, whether the electrical room air supply fan 41 and the cable trench air supply fan 42 are turned on and the size of the operating power determines the air supply volume of the electrical room air supply port 2 and the cable trench air supply port 3.

[0037] The following is a description of the specific process of the present invention to achieve relative balance of temperature and humidity in the electrical cabinet, electrical room 91, and cable trench 93. The relative balance of temperature and humidity does not mean that the temperature and humidity are absolutely consistent, but that the difference in temperature and humidity does not cause condensation.

[0038] The air outlet of the cable trench needs to determine the position, direction and air volume of the air outlet from the cable trench to the electrical room and each electrical cabinet based on the layout of various electrical cabinets, transformers and other equipment in the electrical room and the laying conditions of the ground cover.

[0039] When there are sufficient ventilation holes between the electrical room 91 and the cable trench 93, such as a cover with gaps between the cable trench 93 and the electrical room, the air in the cable trench 93 and the electrical room 91 circulates with each other after the air flow is introduced by the fan, and the air temperature and humidity in the electrical room 91 and the cable trench 93 are relatively balanced.

[0040] When there is not enough air circulation channel between the electrical room 91 and the cable trench 93, some air passages can be added between the electrical room 91 and the cable trench 93. If there is only a high-voltage cabinet 921 in the room and a floor mat is laid on the floor of the electrical room 91, a vent can be set on the cover plate to lead into the electrical room.

[0041] The electrical cabinets are divided into three types: high-voltage cabinet 921, low-voltage cabinet 923 and transformer 922 cabinet according to different internal structures and different condensation risks. Among them, the low-voltage cabinet 923 and transformer 922 cabinet are similar. The bottoms of the low-voltage cabinet 923 and transformer 922 cabinet are directly connected to the cable trench 93, and there are vents on the cabinets of the low-voltage cabinet 923 and transformer 922 cabinets, that is, the air flow in the electrical room 91, the cable trench 93, the low-voltage cabinet 923, and the transformer 922 cabinet is unimpeded. The high-voltage cabinet 921 is different. The gap between the high-voltage cabinet 921 and the cable trench 93 is closed, and the bottom and top of the cabinet of the high-voltage cabinet 921 are not connected, that is, the high-voltage cabinet 921 and the electrical room 91 and the cable trench 93 are relatively closed, and the air flow between the high-voltage cabinet 921 and the cable trench 93 and the electrical room 91 is hindered.

[0042] For the low-voltage cabinet 923 and the transformer cabinet 922, the air in the cable trench 93 flows upward through the transformer cabinet 922 through the gap in the cable trench 93 cover and the bottom of the cabinet and then merges with the indoor air. The two air flows converge in the room and push upward, forming a uniform temperature gradient below the height of the electrical cabinet under the joint action of the indoor air supply, and the excess hot and humid air in the room overflows to the outdoors from the electrical room exhaust vent 912. The air intake volume is precisely controlled to maintain the indoor ambient temperature less than or equal to the cabinet temperature, so as to keep the temperature and humidity balance indoors, in the cable trench 93, and inside and outside the cabinet to destroy the condensation conditions.

[0043] As for the high-voltage cabinet 921. Although the existing high-voltage cabinet 921 is sealed, when the temperature difference between the inside and outside of the cabinet changes, it expands and contracts. Once negative pressure appears in the cabinet, the humid air in the cable trench 93 at the bottom of the cabinet enters the cabinet from the gap of the inlet and outlet cable sealing connection port. Once the temperature suddenly changes, it causes condensation and dirty flashover in the high-voltage cabinet 921. After using the present invention in the electrical room, the temperature and humidity of the electrical room and the cable trench 93 are balanced, and there is no humid and cold air in the cable trench 93. Even if a gap appears between the cable sealing connection port at the bottom of the high-voltage cabinet 921 and the cable trench 93, the balanced temperature and humidity air enters the cabinet without condensation, thereby preventing dirty flashover.

Claims

1. An electrical room temperature control, humidity control and condensation prevention system with a cable trench, comprising an air inlet and an air outlet, an air duct between the air inlet and the air outlet, a fan installed in the air duct, and a filter device installed in the air duct between the air inlet and the fan. Features: The air duct includes an air inlet duct, an electrical room air supply duct, and a cable trench air supply duct, and the air inlet is connected to the electrical room air supply duct and the cable trench air supply duct through the air inlet duct; The air supply outlets include an electrical room air supply outlet located on the electrical room air supply duct and a cable trench air supply outlet located on the cable trench air supply duct; the fan is controlled by an intelligent control system, and the intelligent control system is connected to the temperature and humidity sensor; It also includes an air volume distributor for distributing the air volume of the electrical room air supply outlet and the cable trench air supply outlet; the fan is located in the air inlet duct; the air volume distributor is located at the front end of the junction of the electrical room air supply outlet and the cable trench air supply outlet; the air volume distributor is controlled by an intelligent control system, and the control signal of the intelligent control system comes from the electrical room temperature and humidity sensor and the cable trench temperature and humidity sensor.

2. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench as claimed in claim 1, Features: The temperature and humidity sensors include an electrical room temperature and humidity sensor, a cable trench temperature and humidity sensor, and an air inlet temperature and humidity sensor; the electrical room temperature and humidity sensor is located in the electrical room, the cable trench temperature and humidity sensor is located in the cable trench, and the air inlet temperature and humidity sensor is located at the air inlet; the intelligent control system is connected to the electrical room temperature and humidity sensor, the cable trench temperature and humidity sensor, the air inlet temperature and humidity sensor, and the fan, and the control information of the intelligent control system comes from the electrical room temperature and humidity sensor, the cable trench temperature and humidity sensor, and the air inlet temperature and humidity sensor.

3. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench as claimed in claim 2, Features: It also includes an air volume distributor for distributing the air volume of the electrical room air supply outlet and the cable trench air supply outlet; the fan is located in the air inlet duct; the air volume distributor is located at the front end of the junction of the electrical room air supply outlet and the cable trench air supply outlet; the air volume distributor is controlled by an intelligent control system, and the control signal of the intelligent control system comes from the electrical room temperature and humidity sensor and the cable trench temperature and humidity sensor.

4. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench according to any one of claims 1 to 3, Features: It also includes a return air device, which is located on the air inlet duct between the air inlet and the fan; the return air device is controlled by an intelligent control system.

5. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench as claimed in claim 1, Features: It also includes an electrical room air supply valve and a cable trench air supply valve. The electrical room air supply valve is installed in the electrical room air supply duct, and the cable trench air supply valve is installed in the cable trench air supply duct. The opening size of the electrical room air supply valve and the cable trench air supply valve is controlled by an intelligent control system, and the control signal of the intelligent control system comes from the electrical room temperature and humidity sensor and the cable trench temperature and humidity sensor.

6. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench as claimed in claim 1, Features: The fan includes an electrical room air supply fan and a cable trench air supply fan. The electrical room air supply fan is located in the electrical room air supply duct, and the cable trench air supply fan is located in the cable trench air supply duct. The air supply volume of the electrical room air supply fan and the cable trench air supply fan is controlled by an intelligent control system.

7. The temperature control, humidity control and condensation prevention system for an electrical room with a cable trench as claimed in claim 4, Features: It also includes an air inlet valve installed at the air inlet, and the opening size of the air inlet valve is controlled by an intelligent control system.

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