A maintenance-free moisture absorption device for a transformer

Abstract

The present invention discloses a maintenance-free moisture absorption device for a transformer, which comprises a moisture absorber and a control box. The moisture absorber includes an upper support, a lower support, a fixing sleeve and a connecting flange. An upper air hole is arranged on the upper support, and lower air holes are arranged on the lower support. The fixing sleeve includes a cylindrical outer shell and an inner net which are sleeved with each other, and an inner cavity and an outer cavity are formed inside the outer shell. The upper support and the lower support are coaxially placed at the upper end and the lower end of the fixing sleeve respectively, and the fixing sleeve is clamped and fixed, so that the lower air holes, the inner cavity, the outer cavity and the upper air hole are communicated. The inner cavity is filled with a moisture absorption material. The upper air hole is coaxially connected with the connecting flange. A heating sheet and a temperature and humidity sensor are arranged in the inner cavity. A pressure sensor and an air flow sensor are arranged on the connecting flange. In the present invention, a control cabinet is installed on the moisture absorber to control the heating sheet inside the moisture absorber, so as to detect and remotely transmit the temperature, humidity, pressure and operation process inside the moisture absorber, and realize the maintenance-free function of the moisture absorber.

Description

Technical Field:

[0002] The present invention relates to the field of power supply and transformation maintenance, and particularly to a maintenance-free moisture absorption device for a transformer. Background Art:

[0004] At present, most of the moisture absorbers applied in the power system are ordinary moisture absorbers that need to frequently replace the desiccant. Its working principle is: its upper end is connected to the oil conservator through a connecting pipe, and there are air holes at the lower end that communicate with the atmosphere. During the operation of the transformer, when the temperature of the insulating oil changes, the oil conservator needs to inhale and exhale air, and the air passes through the moisture absorber and enters and exits the oil conservator. There is an oil seal device at the air inlet at the lower end of the moisture absorber. The container is filled with a moisture absorbent such as silica gel or calcium chloride to remove the dust and moisture in the inhaled air. Therefore, the moisture absorber is also called an air filter. During the operation of the transformer, its insulating oil temperature will change with the increase and decrease of the load and the temperature change of the working environment. The change of the insulating oil temperature will cause the breathing action of the oil conservator, and the moisture in the inhaled air will be absorbed by the desiccant in the moisture absorber. When the desiccant absorbs moisture to a certain extent, the moisture absorber or the desiccant in the moisture absorber must be replaced; after replacement, it enters the next life cycle of the moisture absorber.

[0005] This frequent replacement operation not only causes waste of the desiccant and environmental pollution, but also causes the transformer to shut down. When replacing without shutting down, it is easy for some water vapor to enter the oil conservator, affecting the life and working safety. Summary of the Invention:

[0007] The technical problem to be solved by the present invention is to install a control cabinet on the moisture absorber to control the heating element inside the moisture absorber, and realize the detection and remote transmission of the temperature, humidity, pressure and operation process inside the moisture absorber, so as to realize the maintenance-free function of the moisture absorber.

[0008] One technical solution of the present invention is: a maintenance-free moisture absorption device for a transformer, including a moisture absorber and a control box. The moisture absorber includes an upper support, a lower support, a fixing sleeve and a connecting flange. An upper air hole is provided on the upper support, and an upper filter screen is provided at the upper air hole. Lower air holes are provided on the lower support, and lower filter screens are provided at the lower air holes. The fixing sleeve includes a cylindrical outer shell and an inner net sleeved with each other, and an inner cavity and an outer cavity are formed inside the outer shell. The upper support and the lower support are coaxially placed at the upper end and the lower end of the fixing sleeve respectively, and the fixing sleeve is clamped and fixed, so that the lower air holes, the inner cavity, the outer cavity and the upper air holes are communicated. The inner cavity is filled with a moisture absorption material. The upper air hole is coaxially connected with the connecting flange. A heating sheet keel coaxial with the inner net is arranged in the inner cavity. One end of the heating sheet keel is detachably fixed on the lower support, and the other end of the heating sheet keel is detachably fixed on the upper filter screen. A heating sheet fixing plate is arranged on the outer wall of the heating sheet keel. There are at least two heating sheet fixing plates and they are evenly distributed on the outer wall along the axial direction of the heating sheet keel. At least two heating sheets are arranged on the heating sheet fixing plate. The heating sheets are connected with the control box through high-temperature cables. A temperature sensor and a humidity sensor are arranged on the heating sheet fixing plate. The temperature sensor and the humidity sensor are connected with the control box. A pressure sensor and an air flow sensor are arranged at the connecting flange. The pressure sensor and the air flow sensor are connected with the control box.

[0009] Further, a power supply module, a signal acquisition module, an output module and a control module are arranged in the control box. The control module is connected with the power supply module, the signal acquisition module and the output module.

[0010] Further, the power supply module and the signal acquisition module are connected with the pressure sensor, the air flow sensor, the temperature sensor and the humidity sensor. The power supply module is connected with the heating sheets.

[0011] Further, heat dissipation holes for communicating the inner cavity and the outer cavity are formed in the inner net, and a sintered metal net laid along the inner wall of the outer shell is arranged in the outer cavity.

[0012] Further, the bottom of the lower support is detachably connected with one end of a bottom support. A filter screen is arranged at the other end of the bottom support, and it is detachably fixed on the lower support through a baffle.

[0013] Further, the high-voltage cables, the temperature sensor connecting wires and the humidity sensor connecting wires extend into the control box through wire passing holes formed in the upper support. Sealing rubber pads are arranged in the wire passing holes. The high-voltage cables are fixed on the heating sheet fixing plates through wire clips.

[0014] Further, grooves corresponding to the heating sheet fixing plates are arranged on both the upper support and the lower support.

[0015] Further, the lower air holes are arc-shaped holes, there are at least two of them, and they are arranged around their centers on the lower air holes.

[0016] The beneficial effects of the present invention are as follows: The present invention clamps the fixing sleeve through the upper support and the lower support to realize the connection of the three. The upper support is connected to the oil conservator through the connecting flange and the connecting pipe to complete the installation of the moisture absorber. At the same time, the inner cavity is filled with desiccant. When the humidity sensor detects that the humidity is greater than the set threshold, the heating sheet is controlled by the control box to be heated to dry the desiccant. The temperature sensor detects the heating temperature to prevent the desiccant from splashing and the moisture absorber from bursting due to too high temperature. At the same time, the pressure sensor detects the pressure at the connecting flange to prevent the connecting pipe from being blocked and affecting the smooth breathing of the oil conservator. The air flow sensor can detect the air flow direction at the connecting flange. Thus, when the oil conservator exhausts, the heating sheet heats the desiccant. While discharging the generated heat, it can also discharge the water vapor generated by heating, accelerating the drying operation of the desiccant and preventing the water vapor generated by drying from entering the connecting pipe. When the oil conservator inhales, the heating stops and normal inhalation operation is carried out. The desiccant dries the incoming air. Description of the drawings:

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only two of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is the front view of the maintenance-free moisture absorption device for transformers;

[0020] Figure 2 It is the left view of the maintenance-free moisture absorption device for transformers;

[0021] Figure 3 It is the internal structure schematic diagram of the maintenance-free moisture absorption device for transformers;

[0022] Figure 4 It is the structure schematic diagram of the heating sheet fixing plate;

[0023] Figure 5 It is for Figure 4 the left view of

[0024] Figure 6 It is the structure schematic diagram of the internal network;

[0025] Figure 7 It is the structure schematic diagram of the lower support;

[0026] Figure 8 Schematic structural diagram of the upper support.

[0027] In the figure, 1 - upper support, 2 - lower support, 3 - connecting flange, 4 - upper air hole, 5 - upper filter screen, 6 - lower air hole, 7 - lower filter screen, 8 - outer shell, 9 - inner net, 10 - heating fin keel, 11 - heating fin fixing plate, 12 - heating fin, 13 - high-temperature cable, 14 - pressure sensor, 15 - air flow sensor, 16 - controller, 17 - sintered metal mesh, 18 - heat dissipation hole, 19 - bottom support, 20 - filter screen, 21 - baffle, 22 - groove, 23 - wire clamp. Specific embodiments:

[0029] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "arranged", "installed", "connected", "coupled", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "coupled" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0032] Embodiment 1:

[0033] As Figures 1 - 8As shown in the figure, a maintenance-free moisture absorption device for a transformer includes a moisture absorber and a control box 16. The moisture absorber includes an upper support 1, a lower support 2, a fixing sleeve, and a connecting flange 3. An upper air hole 4 is provided on the upper support 1, and an upper filter screen 5 is provided at the upper air hole 4. Lower air holes 6 are provided on the lower support 2, and lower filter screens 7 are provided at the lower air holes 6. The fixing sleeve includes a cylindrical outer shell 8 and an inner net 9 that are sleeved with each other, and an inner cavity and an outer cavity are formed inside the outer shell 8. The upper support 1 and the lower support 2 are respectively coaxially placed at the upper end and the lower end of the fixing sleeve and clamp and fix the fixing sleeve, so that the lower air holes 6, the inner cavity, the outer cavity, and the upper air holes 4 are connected. The inner cavity is filled with a moisture absorption material. The upper air hole 4 is coaxially connected to the connecting flange 3. A heating element 12 keel 10 coaxial with the inner net 9 is provided in the inner cavity. One end of the heating element 12 keel 10 is detachably fixed to the lower support 2, and the other end of the heating element 12 keel 10 is detachably fixed to the upper filter screen 205. A heating element 12 fixing plate 11 is provided on the outer wall of the heating element 12 keel 10. There are at least two heating element 12 fixing plates 11 and they are evenly distributed on the outer wall along the axis of the heating element 12 keel 10. At least two heating elements 12 are provided on the heating element 12 fixing plate 11. The heating elements 12 are connected to the control box 16 through a high-temperature cable 13. A temperature sensor and a humidity sensor are provided on the heating element 12 fixing plate 11. The temperature sensor and the humidity sensor are connected to the control box 16. A pressure sensor 14 and an air flow sensor 15 are provided at the connecting flange 3. The pressure sensor 14 and the air flow sensor 15 are connected to the control box 16.

[0034] In this embodiment, one end of the heating element 12 keel 10 is detachably fixed to the lower support 2, and the other end is fixed to the upper filter screen 5. One end of the outer shell 8 is fixed to the upper support 1 by bolts, and the lower end of the outer shell 8 is fixed to the lower support 2 by bolts to realize the connection of the upper support 1, the lower support 2, and the outer shell 8. At the same time, under the action of the heating element 12 rib, the connection strength of the three is increased. At the same time, the heating element 12 rib is arranged at the axis of the outer shell 8, which is convenient for arranging the heating element 12 and ensures the uniformity of heating the desiccant by the heating element 12.

[0035] During use, the upper support 1 is connected to the connecting pipe through the connecting flange 3 to complete the installation of the moisture absorber. At the same time, the pressure sensor 14 detects the pressure at the connecting flange 3, the air flow sensor 15 detects the air flow direction at the connecting flange 3, and the humidity sensor detects the humidity of the desiccant in the inner cavity and transmits the detection signal to the control box 16. When the pressure value is greater than the set threshold, it indicates that there may be a blockage in the connecting pipe, and an alarm is given through the controller for timely maintenance by personnel. When the air flow direction is towards the connecting pipe, it indicates that the conservator is in the air intake state. At this time, the desiccant adsorbs the incoming air. When the air flow flows from the connecting flange 3 to the inner cavity, it indicates that the conservator is in the exhalation state. During the exhalation state, when the humidity value is greater than the set threshold, the control box 16 controls the heating element 12 to heat and dry the desiccant, and the exhaled gas can discharge the water vapor generated by drying. At the same time, the temperature sensor detects the heating temperature, and when the heating temperature exceeds the threshold, the heating stops until the heating stops when in the air intake state or the humidity value is less than the set threshold.

[0036] When the conservator exhausts, the heating element 12 can heat to dry the silica gel particles (desiccant) and discharge the moisture absorbed by the silica gel particles, realizing the drying and recycling operation of the desiccant. The desiccant does not need to be replaced, can be automatically dried, recycled repeatedly, and can monitor the pressure in the transformer or on-load tap-changer tube in real time to ensure the pressure balance in the tube and guarantee the normal and reliable operation of the transformer or on-load tap-changer, solve the environmental pollution problem caused by the replaced desiccant, and avoid the risk of humid air entering the conservator during the process of replacing the desiccant.

[0037] Embodiment 2:

[0038] As Figures 1 - 8 shown, this embodiment is obtained by describing in detail technical features such as the control box 16 on the basis of Embodiment 1. The remaining technical features are the same as those in Embodiment 1 and will not be elaborated here. Among them, the detailed description of the added technical features is as follows: A power supply module, a signal acquisition module, an output module, and a control module are arranged in the control box 16, and the control module is connected to the power supply module, the signal acquisition module, and the output module.

[0039] Among them, the power supply module and the signal acquisition module are connected to the pressure sensor 14, the air flow sensor 15, the temperature sensor, and the humidity sensor, and the power supply module is connected to the heating element 12.

[0040] In this embodiment, the devices in the control box 16 are described in detail. It can be seen that the power supply module realizes the power supply operation for each module, the sensor and the heating sheet 12. The control module realizes the connection between each module. The signal acquisition module is used to obtain the parameter values of the temperature sensor, humidity sensor, pressure sensor 14 and air flow sensor 15. The output module realizes the connection between the heating sheet 12 and the power supply module, facilitating the electric heating operation. At the same time, it has the function of wireless transmission, and can transmit the parameter values of the temperature sensor, humidity sensor, pressure sensor 14 and air flow sensor 15 obtained to the background for centralized management, realizing the remote monitoring of the moisture absorber, making the transformer moisture absorber intelligent, and eliminating the need for staff to regularly inspect the moisture absorber.

[0041] Among them, the control module is an industrial single-chip microcomputer PIC24FJ256GB110, the power supply module is a rechargeable battery, the output module is an electromagnetic switch and a 4G / 5G communication module, the temperature sensor is an IC digital temperature and humidity sensor, which can accurately sense the humidity condition in the silica gel in the moisture absorber. During the heating process of the heater, it can also accurately measure the temperature in the silica gel, which is beneficial to controlling the heating temperature of the silica gel, that is, avoiding too low heating temperature to fail to dehydrate the silica gel and preventing too high heating temperature from causing the silica gel to explode; the pressure sensor 14 is a PT124G-214 flat diaphragm industrial control pressure transmitter, which real-time monitors the pressure in the transformer or on-load tap-changer pipe, ensures the pressure balance in the pipe, and guarantees the normal and reliable operation of the transformer or on-load tap-changer; the humidity sensor is a DHT11 digital temperature and humidity sensor, and the air flow sensor 15 is an OMEGA air flow sensor 15.

[0042] Embodiment Three:

[0043] As Figures 1 - 8 shown, this embodiment is obtained by adding technical features such as a sintered metal mesh 17 on the basis of Embodiment Two. The rest of the technical features are the same as those in Embodiment Two, and the same parts will not be described in detail here. Among them, the detailed description of the added technical features is: heat dissipation holes 18 for realizing the connection between the inner cavity and the outer cavity are opened on the inner mesh 9, and a sintered metal mesh 17 is arranged along the inner wall of the outer shell 8 in the outer cavity.

[0044] In this embodiment, both ends of the sintered metal mesh 17 are set on the upper support 1 and the lower support 2, and the side is set on the inner wall of the outer shell 8. When the heating sheet 12 heats the desiccant, part of the water vapor generated by heating is discharged under the action of the exhaled air flow, while the other part enters the outer cavity through the heat dissipation holes 18, is cooled and condensed into water on the sintered metal mesh 17, and flows downward along the sintered metal mesh 17 and finally flows out from the lower air holes 6 provided on the lower support 2.

[0045] Among them, the lower air holes 6 are arc-shaped holes, there are at least two of them, and they are arranged around its center.

[0046] The lower air holes 6 are arc-shaped holes, which are arranged in an arc around the center of the lower support 2. They are communicated with the inner cavity and the outer cavity, facilitating the entry of external air into the inner cavity and the outer cavity. Then, the air enters the inner cavity from the outer cavity through the heat dissipation holes 18, and finally enters the connecting flange 3 under the drying and filtering action of the desiccant in the inner cavity, while not affecting the discharge of condensed water.

[0047] Embodiment 4:

[0048] As Figures 1 - 8 shown, this embodiment is obtained by adding technical features such as the bottom support 19 on the basis of Embodiment 3. The rest of the technical features are the same as those in Embodiment 3, and the same parts will not be described in detail here. Among them, the detailed description of the added technical features is as follows: One end of the bottom of the lower support 2 is detachably connected to one end of the bottom support 19, and a filter screen 20 is arranged at the other end of the bottom support 19, and is detachably fixed on the lower support 2 through a baffle 21.

[0049] In this embodiment, by installing a detachable bottom support 19 at the bottom of the lower support 2 and arranging a detachable filter screen 20 on the bottom support 19, it forms a two-layer filtering structure in cooperation with the lower filter screen 7. The filter screen 20 is for storage filtration, and the lower filter screen 7 is for fine filtration. The preliminary filtration realizes the preliminary filtration of the incoming air to prevent large-particle sundries from entering, and while the fine filtration conducts further filtration, it also prevents the desiccant inside the inner cavity from falling off.

[0050] Embodiment 5:

[0051] As Figures 1 - 8 shown, this embodiment is obtained by adding technical features such as wire passing holes on the basis of Embodiment 4. The rest of the technical features are the same as those in Embodiment 4, and the same parts will not be described in detail here. Among them, the detailed description of the added technical features is as follows: The high-voltage cable, the temperature sensor connecting wire, and the humidity sensor connecting wire extend into the control box 16 through the wire passing holes opened on the upper support 1. The wire passing holes are provided with sealing rubber gaskets, and the high-voltage cable is fixed on the fixing plate 11 of the heating sheet 12 through a wire clamp 23.

[0052] In this embodiment, the heating sheet 12, the temperature sensor, the humidity sensor, and the wire arrangement structure are described. Since the control box 16 is fixed on the upper support 1, the connecting wires directly enter the control box 16 through the wire passing holes provided on the upper support 1, and a sealing gasket is arranged at the wire passing holes to prevent external gas from entering while reducing the use of wires and facilitating operation.

[0053] Embodiment 6:

[0054] As Figures 1 - 8As shown, this embodiment is obtained by adding technical features such as the groove 22 on the basis of Embodiment Five. The remaining technical features are the same as those in Embodiment Five, and the same parts will not be described in detail here. Among them, the detailed description of the added technical features is as follows: Grooves 22 corresponding to the fixing plate 11 of the heating sheet 12 are provided on both the upper support 1 and the lower support 2.

[0055] In this embodiment, when the upper support 1 and the lower support 2 clamp and fix the fixing sleeve, both ends of the fixing plate 11 of the heating sheet 12 can extend into the grooves 22 on the upper support 1 and the lower support 2 to fix the fixing plate 11 of the heating sheet 12, thereby increasing the stability of the connection.

[0056] The above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A maintenance-free moisture absorption device for a transformer, comprising a moisture absorber and a control box, characterized in that: The moisture absorber includes an upper support, a lower support, a fixing sleeve and a connecting flange. An upper air hole is provided on the upper support, and an upper filter screen is arranged at the upper air hole. Lower air holes are provided on the lower support, and lower filter screens are arranged at the lower air holes. The fixing sleeve includes a cylindrical outer shell and an inner net sleeved with each other, and an inner cavity and an outer cavity are formed inside the outer shell. The upper support and the lower support are coaxially placed at the upper end and the lower end of the fixing sleeve respectively, and clamp and fix the fixing sleeve, so that the lower air holes, the inner cavity, the outer cavity and the upper air holes are communicated. The inner cavity is filled with a moisture-absorbing material. The upper air hole is coaxially connected with the connecting flange. A heating sheet keel coaxial with the inner net is arranged in the inner cavity. One end of the heating sheet keel is detachably fixed on the lower support, and the other end of the heating sheet keel is detachably fixed on the upper filter screen. A heating sheet fixing plate is arranged on the outer wall of the heating sheet keel. There are at least two heating sheet fixing plates and they are evenly distributed on the outer wall along the axial direction of the heating sheet keel. At least two heating sheets are arranged on the heating sheet fixing plate. The heating sheets are connected with the control box through high-temperature cables. A temperature sensor and a humidity sensor are arranged on the heating sheet fixing plate. The temperature sensor and the humidity sensor are connected with the control box. A pressure sensor and an air flow sensor are arranged at the connecting flange. The pressure sensor and the air flow sensor are connected with the control box; The power supply module supplies power to each module, sensor and heating sheet. The control module realizes the connection between each module. The signal acquisition module is used to obtain the parameter values of the temperature sensor, humidity sensor, pressure sensor and air flow sensor. The output module realizes the connection between the heating sheet and the power supply module, facilitating the electric heating operation. At the same time, it has a wireless transmission function and can transmit the parameter values of the temperature sensor, humidity sensor, pressure sensor and air flow sensor obtained to the background for centralized management, realizing the remote monitoring of the moisture absorber.

2. The maintenance-free moisture absorption device for a transformer according to claim 1, characterized in that: A power supply module, a signal acquisition module, an output module and a control module are arranged in the control box, and the control module is connected with the power supply module, the signal acquisition module and the output module.

3. The maintenance-free moisture absorption device for a transformer according to claim 2, characterized in that: The power supply module and the signal acquisition module are connected with the pressure sensor, air flow sensor, temperature sensor and humidity sensor, and the power supply module is connected with the heating sheet.

4. The maintenance-free moisture absorption device for a transformer according to claim 3, characterized in that: Heat dissipation holes for communicating the inner cavity and the outer cavity are formed in the inner net, and a sintered metal net laid along the inner wall of the outer shell is arranged in the outer cavity.

5. The maintenance-free moisture absorption device for a transformer according to claim 4, characterized in that: The bottom of the lower support is detachably connected with one end of a bottom support. A filter screen is arranged at the other end of the bottom support, and it is detachably fixed on the lower support through a baffle.

6. The maintenance-free moisture absorption device for a transformer according to claim 5, characterized in that: The high-temperature cables, temperature sensor connecting wires and humidity sensor connecting wires extend into the control box through wire passing holes formed in the upper support. Sealing rubber pads are arranged in the wire passing holes, and the high-voltage cables are fixed on the heating sheet fixing plate through wire clips.

7. The maintenance-free moisture absorption device for a transformer according to claim 6, characterized in that: Grooves corresponding to the heating sheet fixing plates are arranged on both the upper support and the lower support.

8. The maintenance-free moisture absorption device for a transformer according to claim 7, characterized in that: The lower air holes are arc-shaped holes, there are at least two of them, and they are arranged around its center of the circle on the lower air holes.

Images