An iron core micro transformer

Abstract

The present application discloses an iron core microtransformer in the field of microtransformer technology, comprising a housing, an iron core, and a coil wound around the iron core. The housing is provided with a heat dissipation vent, to which a desiccant cartridge is detachably connected. The desiccant cartridge has an air inlet on the side facing the heat dissipation vent and an air outlet on the side facing the top of the housing. The desiccant cartridge contains a desiccant, and the bottom of the desiccant cartridge also has an interlayer. The top of the interlayer has a plurality of water-permeable holes communicating with the interior of the desiccant cartridge, and the top of the interlayer also has a sponge layer covering the plurality of water-permeable holes. The side of the interlayer near the heat dissipation vent is provided with an opening, and the interlayer is slidably connected to a connecting rod extending out of the opening. One end of the connecting rod is rotatably connected to a pressure roller that compresses the sponge layer, and the other end of the connecting rod is fixedly connected to a sealing plate that seals the opening. This solution can quickly determine whether the desiccant has failed.

Description

Technical Field

[0001] The present invention relates to the technical field of micro transformers, and in particular to an iron core micro transformer. Background Art

[0002] Microtransformers primarily refer to transformers below 20kV / A for single-phase and 50kV / A for three-phase. Compared to traditional transformers, they are smaller, less expensive, and require fewer wires. Microtransformers generally have lower load and utilization rates, and the inductive loads they carry are generally not capacitively compensated. As precision components, microtransformers are commonly used in factory electrical control systems. With the widespread use of electronic components in power plant control, monitoring, and automation circuits, their application is becoming increasingly widespread.

[0003] For example, a multifunctional micro-transformer with publication number CN206349211U includes a base, a transformer housing, and a sealing cover. The transformer housing and the sealing cover are both composed of a shell and a magnetic shielding layer, which is installed inside the shell. This micro-transformer is easy to insert and remove and has good shock resistance. A desiccant box is also provided inside the transformer housing. The desiccant is specifically calcium chloride, which absorbs moisture from the air inside the transformer housing. However, after a period of use, the desiccant reaches saturation with water and loses its drying function. The above patent requires disassembling the transformer housing to remove the desiccant box in order to determine whether the desiccant has expired. This makes it difficult to determine whether the desiccant has expired and prevents the desiccant from being replaced in a timely manner. Summary of the Invention

[0004] The present invention aims to provide an iron core micro transformer to solve the problem of inconvenience in judging the failure of a desiccant in the prior art.

[0005] In order to solve the above problems, the present invention provides the following technical solutions: an iron core micro-transformer, comprising a shell, an iron core and a coil wound on the iron core, the shell being provided with a heat dissipation vent, the heat dissipation vent being detachably connected to a desiccant box, the desiccant box being provided with an air inlet on a side facing the heat dissipation vent, and an air outlet on a side facing the top of the shell; a desiccant box being provided with a desiccant inside, the desiccant box being further provided with an interlayer at the bottom, the interlayer being provided with a plurality of water permeable holes communicating with the interior of the desiccant box at the top, the interlayer being further provided with a sponge layer covering the plurality of water permeable holes at the top, the interlayer being provided with a through opening on a side of the interlayer close to the heat dissipation vent, the interlayer being slidably connected to a connecting rod extending out of the through opening, one end of the connecting rod being rotatably connected to a pressure roller for rolling the sponge layer, and the other end of the connecting rod being fixedly sleeved with a sealing plate for sealing the through opening.

[0006] The working principle and beneficial effects of this invention are as follows: This solution places a desiccant box at the heat dissipation vent, and a sealing plate seals the opening. This forces air blown into the housing from the outside through the heat dissipation vent to pass through the desiccant box, achieving a better drying effect. Air is then blown into the desiccant box through the heat dissipation vent and the air inlet. Since the air outlet is toward the top of the housing, the desiccant box provides a certain barrier to the incoming air, extending the time the air remains in the desiccant box. The dried air then enters the housing through the air outlet at the top.

[0007] Desiccant absorbs moisture from the air. As the desiccant is used for a longer period of time, moisture gradually seeps from the top layer to the bottom layer, indicating that the desiccant is saturated with moisture. The bottom of the desiccant box has a sandwich layer, and the top of the sandwich layer has multiple permeable holes that connect to the interior of the desiccant box. Excess moisture that the desiccant cannot absorb flows into the sandwich layer through the holes and is absorbed by the sponge layer on top of the sandwich layer. To determine whether the desiccant is invalid, pull the connecting rod toward the opening. The connecting rod drives the sealing plate and the pressure roller connected to it toward the opening. The pressure roller presses the sponge layer toward the opening, collecting the absorbed moisture. If water droplets appear on the pressure roller when it reaches the opening, the desiccant is invalid. If there are no water stains on the pressure roller, the desiccant is still effective.

[0008] Beneficial effects of the present invention: Compared with the prior art which requires opening the outer shell to determine whether the desiccant has expired, the present solution does not require taking out the desiccant box. When making a judgment, it is only necessary to pull the connecting rod to determine whether there is water stain on the pressure roller. Therefore, it is more convenient and quick to determine whether the desiccant has expired.

[0009] Furthermore, the sealing plate is symmetrically provided with connecting wings, each connecting wing being fixed to the desiccant box by a bolt, so that the sealing plate can be easily fixed and disassembled.

[0010] Furthermore, a magnetic shielding layer is provided inside the shell, which has the function of resisting interference and shielding external electromagnetic signals, thereby avoiding signal interference with the coil on the iron core.

[0011] Furthermore, the air inlet is provided with a filter screen which can filter out debris and dust in the air.

[0012] Furthermore, the shell is provided with a wire outlet hole, a U-shaped connecting groove is provided at the wire outlet hole, a fixing clamp is provided on the side of the wire outlet hole close to the shell, and a sealing ring is provided on the side of the wire outlet hole away from the shell. The top of the shell is also vertically slidably connected to a pressure rod extending into the connecting groove, and the bottom of the pressure rod is fixed with a pressure block matching the shape of the connecting groove, and a spring is provided between the top of the pressure rod and the top of the shell.

[0013] When the cable of the external device passes through the outlet hole and is connected to the coil, the end of the cable located at the outlet hole close to the coil is clamped by the fixing clamp ring to fix this end of the cable. Since a U-shaped connecting groove is provided at the outlet hole, and the top of the shell is also vertically slidably connected to a pressure rod extending into the connecting groove, and a pressure block matching the shape of the connecting groove is fixed at the bottom of the pressure rod, the pressure rod is pressed downward at this time, and the pressure rod compression spring is compressed and moves the pressure block toward the connecting groove. The pressure block squeezes the middle part of the cable and bends toward the connecting groove. After releasing the pressure rod, the pressure block stops squeezing the cable, and then the sealing ring is placed in the outlet hole to achieve sealing.

[0014] Due to the squeezing of the pressure block, the cable has a certain bending amplitude in the connection groove, so that the cable has a certain length of margin here. When the external equipment moves or shakes, this part of the margin cable can be pulled out of the outlet hole, thereby avoiding direct pulling of the cable, causing damage to the fixing clamp, and in severe cases, pulling the connection point of the cable and the transformer coil, causing leakage.

[0015] Furthermore, the number of the air inlets is multiple, which can increase the heat dissipation rate and enhance the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an iron core micro transformer of the present invention;

[0017] Figure 2 for Figure 1 Partial cross-sectional view of the desiccant cartridge. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The figure marks in the drawings of the specification include: lower base 1, coil 2, shell 3, upper base 4, desiccant box 5, connecting rod 6, pressure roller 7, connecting shaft 8, interlayer 9, sponge layer 10, desiccant layer 11, air outlet 12, air inlet 13, water permeable hole 14, and sealing plate 15.

[0020] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0021] Embodiment: A core micro transformer, such as Figure 1 As shown, it includes a shell 3, an upper base 4 and a lower base 1 are provided inside the shell 3, an iron core is provided between the upper base 4 and the lower base 1, a coil 2 is wound on the iron core, and a heat dissipation port is provided on the right side of the shell 3, and the heat dissipation port is detachably connected to a desiccant box 5.

[0022] like Figure 2 As shown, an air inlet 13 is provided on the right side of the desiccant box 5, and an air outlet 12 is provided on the top of the left side of the desiccant box 5; a desiccant layer 11 is provided inside the desiccant box 5, and the desiccant is calcium chloride. An interlayer 9 is also provided at the bottom of the desiccant box 5, and a plurality of water-permeable holes 14 communicating with the interior of the desiccant box 5 are provided on the top of the interlayer 9. A sponge layer 10 covering the plurality of water-permeable holes 14 is also provided on the top of the interlayer 9. A through opening is provided on the right side of the interlayer 9, and the interlayer 9 is horizontally slidably connected to a connecting shaft 8, which is rotatably connected to a pressure roller 7 for rolling the sponge layer 10, and the connecting shaft 8 is fixedly connected to a connecting rod 6, which is fixedly sleeved with a sealing plate 15 for sealing the through opening.

[0023] In this solution, the desiccant cartridge 5 is positioned at the heat dissipation vent, with a sealing plate 15 sealing the opening. This forces air entering the housing 3 from the outside through the heat dissipation vent to pass through the desiccant cartridge 5, achieving a more effective drying effect. Air is then drawn into the desiccant cartridge 5 through the heat dissipation vent and air inlet 13. Since the air outlet 12 faces the top of the housing 3, the desiccant cartridge 5 provides a barrier to the incoming air, extending the time the air remains within the desiccant cartridge 5. The dried air then enters the housing 3 through the air outlet 12 at the top.

[0024] Desiccant absorbs moisture from the air. Over time, moisture gradually seeps from the top layer of the desiccant to the bottom layer, indicating that the desiccant is saturated with moisture. Desiccant cartridge 5 has an interlayer 9 at its bottom, and multiple water-permeable holes 14 at its top that connect to the interior of the desiccant cartridge 5. Excess moisture that the desiccant cannot absorb flows through these holes 14 into interlayer 9 and is absorbed by sponge layer 10 atop interlayer 9. To determine if the desiccant is ineffective, the connecting rod 6 is pulled toward the opening. This moves sealing plate 15 and connecting shaft 8 toward the opening, causing pressure roller 7 to press sponge layer 10 toward the opening, collecting the absorbed moisture. If water droplets appear on pressure roller 7 when it reaches the opening, the desiccant is ineffective. If no water stains remain on pressure roller 7, the desiccant is still effective.

[0025] It should be noted that those skilled in the art may make numerous variations and improvements without departing from the structure of the present invention, and these variations and improvements should also be considered within the scope of protection of the present invention. These variations and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application shall be based on the content of the claims, and the specific embodiments and other descriptions in the specification may be used to interpret the content of the claims.

Claims

1. An iron core micro transformer, comprising a housing, an iron core, and a coil wound around the iron core, characterized in that: The shell is provided with a heat dissipation vent, and a desiccant box is detachably connected to the heat dissipation vent. An air inlet is provided on a side of the desiccant box facing the heat dissipation vent, and an air outlet is provided on a side of the desiccant box facing the top of the shell. Desiccant is provided inside the desiccant box, and an interlayer is further provided at the bottom of the desiccant box. A plurality of water permeable holes communicating with the interior of the desiccant box are provided at the top of the interlayer. A sponge layer covering the plurality of water permeable holes is further provided at the top of the interlayer. A through opening is provided on a side of the interlayer close to the heat dissipation vent, and a connecting rod extending out of the through opening is slidably connected to the interlayer. One end of the connecting rod is rotatably connected to a pressure roller for rolling the sponge layer, and the other end of the connecting rod is fixedly sleeved with a sealing plate for sealing the through opening.

2. The iron core micro transformer according to claim 1, characterized in that: The sealing plate is symmetrically provided with connecting wings, and each connecting wing is fixed to the desiccant box by a bolt.

3. The iron core micro transformer according to claim 1, characterized in that: A magnetic shielding layer is provided inside the shell.

4. The iron core micro-transformer according to claim 1, characterized in that: The air inlet is provided with a filter.

5. The iron core micro transformer according to any one of claims 2 to 4, characterized in that: The shell is provided with a wire outlet hole, a U-shaped connecting groove is provided at the wire outlet hole, a fixing clamp is provided on the side of the wire outlet hole close to the shell, and a sealing ring is provided on the side of the wire outlet hole away from the shell. The top of the shell is also vertically slidably connected to a pressure rod extending into the connecting groove, the bottom of the pressure rod is fixed with a pressure block matching the shape of the connecting groove, and a spring is provided between the top of the pressure rod and the top of the shell.

6. The iron core micro-transformer according to claim 5, characterized in that: There are multiple air inlets.

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