A maintenance-free desiccant for power transformer

Abstract

The utility model proposes a maintenance-free desiccant for an electric transformer, comprising a casing, a connecting pipe, a desiccant, a fixed pipe and a heating rod, wherein the connecting pipe is fixedly arranged in the casing, and a vent hole is opened on the peripheral side thereof; the desiccant is filled between the casing and the connecting pipe; the fixed pipe is fixedly arranged in the connecting pipe in a detachable manner, and a connecting cavity is arranged between the outer side of the fixed pipe and the inner side of the connecting pipe, and the two ends of the casing are connected to the connecting cavity through the vent hole; the heating rod is fixedly arranged on the fixed pipe. The utility model provides a connecting pipe and a fixed pipe, and fixes the two in a detachable manner, so that the heating rod can be separated from the desiccant, and the heating rod can be easily disassembled and assembled, thereby improving the efficiency of replacing the heating rod of the desiccant.

Description

Technical Field

[0001] The utility model relates to the technical field of desiccant, in particular to a maintenance-free desiccant for a power transformer. Background Art

[0002] The operation of power transformers is related to the safety and stability of the entire power grid. Once a transformer fails, it will cause great economic losses. Desiccant is an indispensable and important component of oil-immersed transformers. It is installed on the air inlet and outlet of the power transformer or transformer oil tank to maintain the cleanliness and insulation strength of the transformer oil through its filtering effect.

[0003] The utility model with patent publication number CN213660163U discloses an intelligent maintenance-free desiccant that can detect the breathing state of a transformer. When the silica gel in the desiccant is saturated with moisture, the silica gel is heated and regenerated to restore its moisture absorption performance, thereby achieving the purpose of maintenance-free. At the same time, the breathing state of the transformer is detected to prevent the respirator from being blocked.

[0004] In the above technical solution, in order to realize the maintenance-free function of the desiccant in the desiccant, a heater is arranged in the tempered glass cylinder. However, the heater is a consumable part and is embedded in the silica gel desiccant, which is inconvenient to disassemble and assemble, thereby reducing the replacement efficiency of the heater. Utility Model Content

[0005] In view of this, the utility model proposes a maintenance-free desiccant for a power transformer, which can facilitate the disassembly and assembly of a heating rod and improve the replacement efficiency of the heating rod.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides a maintenance-free desiccant for a power transformer, comprising a casing, a connecting pipe, a desiccant, a fixed pipe and a heating rod, wherein:

[0007] The connecting pipe is fixedly arranged in the housing, and a vent hole is opened on the peripheral side thereof;

[0008] The desiccant is filled between the housing and the connecting pipe;

[0009] The fixing pipe is fixedly arranged in the connecting pipe in a detachable manner, a connecting cavity is arranged between the outer side of the fixing pipe and the inner side of the connecting pipe, and both ends of the housing are connected to the connecting cavity through the vent hole;

[0010] The heating rod is fixedly arranged on the fixed tube.

[0011] On the basis of the above technical solution, preferably, the fixing tube includes an intermediate tube and a spring sheet, wherein:

[0012] The intermediate tube is located inside the connecting tube, and a connecting cavity is provided between the two;

[0013] The spring sheet is fixedly arranged on the intermediate tube and abuts against the inner wall of the connecting tube.

[0014] More preferably, the heating rod is fixedly disposed in the intermediate tube.

[0015] More preferably, a plurality of the spring sheets are provided, and the plurality of the spring sheets are symmetrically arranged about a center line of the intermediate tube.

[0016] More preferably, the intermediate tube is a rectangular tubular structure, and the connecting tube is a circular tubular structure.

[0017] More preferably, it further comprises a plurality of fins, wherein the fins are fixedly disposed on the connecting tube and are located inside the desiccant.

[0018] On the basis of the above technical solution, preferably, the two ends of the housing are respectively provided with a first port and a second port, wherein:

[0019] The first port is in communication with the desiccant;

[0020] The second port is communicated with the communication cavity and is used for connecting to the transformer.

[0021] More preferably, one end of the housing close to the first port is spherical.

[0022] More preferably, the machine further comprises an exhaust fan, wherein the exhaust fan is fixedly arranged at an end of the casing away from the second port.

[0023] More preferably, it also includes a temperature and humidity sensor and an airflow sensor, which are fixedly arranged at an end of the casing away from the first port, and are used to detect the temperature, humidity and flow direction of the gas inside the desiccant, respectively.

[0024] The utility model of a maintenance-free dehumidifier for a power transformer has the following beneficial effects compared with the prior art:

[0025] (1) By providing a connecting pipe and a fixing pipe, and allowing the two to be fixedly connected in a detachable manner, the heating rod can be separated from the desiccant, and the heating rod can be easily disassembled and assembled, thereby improving the efficiency of replacing the heating rod of the desiccant absorber;

[0026] (2) By providing the intermediate tube and the spring sheet, not only can the fixing structure of the fixing tube be simplified, but also the inner diameter of the connecting cavity can be avoided from being affected, thereby preventing the air suction efficiency of the dehumidifier from being affected;

[0027] (3) By providing fins, the drying efficiency of the desiccant can be accelerated. By providing an exhaust fan, the exhalation efficiency of the desiccant can be accelerated. By providing a temperature and humidity sensor and an airflow sensor, the normal operation of the maintenance-free operation of the desiccant in the desiccant can be guaranteed, thereby improving the convenience of use of the desiccant. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is an axial cross-sectional view of a maintenance-free desiccant for a power transformer according to the utility model;

[0030] Figure 2 This is a radial cross-sectional view of a maintenance-free desiccant for a power transformer according to the utility model;

[0031] Figure 3 It is a three-dimensional diagram of a fixed pipe in a maintenance-free desiccant for a power transformer of the utility model;

[0032] Figure 4 The utility model is a three-dimensional diagram of a maintenance-free desiccant for a power transformer.

[0033] Among them: 1. Casing; 101. First port; 102. Second port; 2. Connecting pipe; 201. Air vent; 202. Connecting cavity; 3. Desiccant; 4. Fixed pipe; 41. Middle pipe; 42. Shrapnel; 5. Heating rod; 6. Fin; 7. Exhaust fan; 8. Temperature and humidity sensor; 9. Airflow sensor. DETAILED DESCRIPTION

[0034] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figure 1-4 As shown, a maintenance-free desiccant for a power transformer of the utility model comprises a casing 1, a connecting pipe 2, a desiccant 3, a fixing pipe 4, a heating rod 5, a fin 6, an exhaust fan 7, a temperature and humidity sensor 8 and an airflow sensor 9.

[0036] The housing 1 is used to install and protect other components.

[0037] The connecting pipe 2 is used to carry the fixed pipe 4 . The connecting pipe 2 is fixedly arranged in the housing 1 . A vent hole 201 is opened on the peripheral side of the connecting pipe 2 . The vent hole 201 connects the inner and outer sides of the connecting pipe 2 .

[0038] The desiccant 3 is used to filter impurities and water vapor in the air to prevent water vapor and impurities from entering the power transformer along the desiccant. The desiccant 3 is filled between the casing 1 and the connecting pipe 2. The desiccant 3 can be made of silica gel desiccant. The air can pass through the desiccant 3, and the moisture and impurities in the air can be blocked and filtered by the desiccant 3.

[0039] The fixed tube 4 is used to carry the heating rod 5. The heating rod 5 is fixedly arranged on the fixed tube 4. The fixed tube 4 is fixedly arranged in the connecting tube 2 in a detachable manner. Figure 2 As shown, a connecting cavity 202 is provided between the outer side of the fixed tube 4 and the inner side of the connecting tube 2, and the two ends of the casing 1 are connected through the vent hole 201 and the connecting cavity 202, that is, the air can flow into the other end of the casing 1 through one end of the casing 1, the desiccant 3, the vent hole 201 and the connecting cavity 202 in sequence; the connecting tube 2 isolates the heating rod 5 and the desiccant 3 so that the two can be independent of each other, and the fixed tube 4 and the connecting tube 2 are detachably fixedly connected. When the heating rod 5 reaches the end of its service life, the fixed tube 4 can be removed from the connecting tube 2 so as to realize the rapid replacement of the heating rod 5, which can improve the replacement efficiency of the heating rod 5 and ensure the normal operation of the desiccant.

[0040] like Figure 2 and Figure 3 As shown, the fixed tube 4 includes an intermediate tube 41 and a spring piece 42, wherein the intermediate tube 41 is located inside the connecting tube 2, and a connecting cavity 202 is arranged between the two; the spring piece 42 is fixedly arranged on the intermediate tube 41, and abuts against the inner wall of the connecting tube 2. When the fixed tube 4 is inside the connecting tube 2, the spring piece 42 abuts and fixes the inner wall of the connecting tube 2, and when a force is applied to the intermediate tube 41 along its axial direction and greater than the friction force between the spring piece 42 and the connecting tube 2, the intermediate tube 41 can be taken out of the connecting tube 2 so as to realize the rapid replacement of the heating rod 5; specifically, in order to prevent the heating rod 5 from affecting the inner diameter of the connecting cavity 202, it is preferred that the heating rod 5 is fixedly arranged inside the intermediate tube 41.

[0041] Preferably, the spring pieces 42 are provided in plurality, and the plurality of spring pieces 42 are symmetrically arranged about the center line of the intermediate tube 41, such as Figure 2 As shown, two spring sheets 42 are arranged on opposite sides of the middle tube 41, one end of the spring sheet 42 is integrally formed with the middle tube 41, and the other end is abutted against the connecting tube 2, so that the connecting cavity 202 forms a stable and symmetrical shape, realizing uniform air flow.

[0042] As a preferred embodiment, the middle tube 41 can be set as a rectangular tubular structure, and the connecting tube 2 can be set as a circular tubular structure. By utilizing the difference in shape between the two, a uniform connecting cavity 202 is naturally formed, and the shape of the connecting cavity 202 will not vary with the rotation of the middle tube 41.

[0043] The fins 6 are used to enhance the heating effect of the heating rod 5 on the desiccant 3. The fins 6 are fixedly mounted on the connecting tube 2 and are located inside the desiccant 3, so that the heat generated by the heating rod 5 is quickly transferred to the desiccant 3 to evaporate the water vapor in the desiccant 3. Specifically, it is preferred to provide a plurality of fins 6, and to arrange the plurality of fins 6 around the center line circumference of the connecting tube 2.

[0044] A first port 101 and a second port 102 are respectively provided at both ends of the casing 1, wherein the first port 101 is connected to the desiccant 3, and the second port 102 is connected to the connecting cavity 202, and is used to be connected to the transformer; the second port 102 is connected to the transformer, and when the transformer inhales, the outside air enters into the casing 1 along the first port 101, and enters into the transformer in sequence through the desiccant 3, the vent 201, the connecting cavity 202 and the second port 102, and when the transformer exhales, the gas inside the transformer is discharged into the external environment in the reverse direction. While the transformer exhales, the heating rod 5 can be turned on to heat the desiccant 3 to evaporate the water vapor inside it and discharge it along the first port 101.

[0045] In order to facilitate the discharge of water vapor, it is preferred that the end of the housing 1 close to the first port 101 is set to be spherical. Figure 1 As shown, it is configured to be in an arc shape so that the water vapor can quickly flow out of the housing 1 after condensation.

[0046] The exhaust fan 7 is used to speed up the efficiency of exhausting water vapor and air from the casing 1. The exhaust fan 7 is fixedly arranged at one end of the casing 1 away from the second port 102. When the transformer exhales, the exhaust fan 7 can be turned on.

[0047] The temperature and humidity sensor 8 is fixedly arranged at one end of the casing 1 away from the first port 101, and is used to detect the temperature and humidity of the gas inside the desiccant. When the humidity is high and exceeds the threshold, it can prompt the operator to maintain the desiccant 3, that is, turn on the heating rod 5 when the transformer exhales.

[0048] The airflow sensor 9 is fixedly arranged at one end of the casing 1 away from the first port 101, and is used to detect the flow direction of the gas inside the desiccant, and determine whether the transformer is in the exhalation state or the inhalation state through the gas flow direction, thereby realizing the automatic start and stop of the heating rod 5 and preventing the heating rod 5 from being turned on when the transformer is in the inhalation state.

[0049] The working principle of the maintenance-free dehumidifier for power transformer of the utility model is as follows:

[0050] The second port 102 is connected to the transformer. When the power transformer inhales, the outside air enters the transformer through the first port 101, the desiccant 3, the vent 201, the connecting cavity 202 and the second port 102 in sequence. The desiccant 3 filters the impurities and water vapor in the air, allowing clean air to enter the transformer to avoid damage to the transformer due to water ingress. When the transformer exhales, the gas inside the transformer is discharged back to the outside environment. During this process, the temperature and humidity sensor 8 can monitor the humidity of the air in real time. When the humidity exceeds the preset threshold and the airflow sensor 9 detects that the transformer is in the exhalation state, the heating rod 5 is turned on to heat the desiccant 3 to evaporate the water vapor inside it, and let the water vapor be discharged from the first port 101 along with the air until the humidity is lower than the threshold, thereby realizing maintenance-free operation of the desiccant 3.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A maintenance-free desiccant for a power transformer, characterized in that: It comprises a housing (1), a connecting pipe (2), a desiccant (3), a fixing pipe (4) and a heating rod (5), wherein: The connecting pipe (2) is fixedly arranged in the housing (1), and a vent hole (201) is opened on the peripheral side of the connecting pipe; The desiccant (3) is filled between the housing (1) and the connecting pipe (2); The fixed pipe (4) is fixedly arranged in the connecting pipe (2) in a detachable manner, a connecting cavity (202) is arranged between the outer side of the fixed pipe (4) and the inner side of the connecting pipe (2), and the two ends of the housing (1) are connected to the connecting cavity (202) through the vent hole (201); The heating rod (5) is fixedly arranged on the fixed tube (4).

2. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 1, characterized in that: The fixing tube (4) comprises an intermediate tube (41) and a spring sheet (42), wherein: The intermediate tube (41) is located inside the connecting tube (2), and a connecting cavity (202) is provided between the two; The spring sheet (42) is fixedly arranged on the intermediate tube (41) and abuts against the inner wall of the connecting tube (2).

3. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 2, characterized in that: The heating rod (5) is fixedly arranged in the intermediate tube (41).

4. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 3, characterized in that: A plurality of the spring sheets (42) are provided, and the plurality of the spring sheets (42) are symmetrically arranged about the center line of the intermediate tube (41).

5. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 4, characterized in that: The intermediate tube (41) is a rectangular tube structure, and the connecting tube (2) is a circular tube structure.

6. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 5, characterized in that: It also includes a plurality of fins (6), wherein the fins (6) are fixedly arranged on the connecting pipe (2) and located inside the desiccant (3).

7. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 1, characterized in that: The housing (1) has a first port (101) and a second port (102) respectively formed at two ends thereof, wherein: The first port (101) is in communication with the desiccant (3); The second port (102) is in communication with the communication cavity (202) and is used for connecting to a transformer.

8. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 7, characterized in that: An end of the housing (1) close to the first port (101) is spherical.

9. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 8, characterized in that: It also comprises an exhaust fan (7), wherein the exhaust fan (7) is fixedly arranged at an end of the casing (1) away from the second port (102).

10. A maintenance-free dehumidifying breather for a power transformer as claimed in claim 9, characterized in that: It also includes a temperature and humidity sensor (8) and an airflow sensor (9), wherein the temperature and humidity sensor (8) and the airflow sensor (9) are fixedly arranged at one end of the housing (1) away from the first port (101), and are used to detect the temperature, humidity and flow direction of the gas inside the desiccant, respectively.

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