A varistor protective shell

Abstract

The utility model belongs to the technical field of varistors, and specifically relates to a varistor protective shell, including a lower shell and an upper shell, the opening ends of the lower shell and the upper shell are respectively bent inward to form an inner oblique plate and an outer oblique plate, the end of the inner oblique plate is bent outward to form a snap-on plate, the outer side surface of the inner oblique plate fits the inner side surface of the outer oblique plate, the end of the outer oblique plate fits the inner side of the snap-on plate, the bottom end of the upper shell is bent to form a bending plate, the end plate formed on the inner side of the bending plate presses against one end of the varistor, and the other end of the varistor presses against the inner end surface of the lower shell. The lower shell and the upper shell can be connected quickly and firmly through the elastic snap connection of the bending part, and the varistor is conveniently protected on the inside; when the varistor explodes, the elastic deformation of the bending plate can achieve the effect of buffering and energy absorption, reducing the risk of the lower shell and the upper shell being broken.

Description

Technical Field

[0001] The utility model belongs to the technical field of varistor, and in particular relates to a varistor protective shell. Background Art

[0002] Varistors are essentially different from resistors, although they are also called resistors. First of all, varistors are nonlinear components. The reason why they are called varistors is that they are sensitive to voltage and are an overvoltage protection component. Resistors generally exist as loads in circuits and also have the function of voltage division and current limiting, but varistors are different. Their function is to prevent overvoltage in the circuit, similar to the function of lightning arresters or overvoltage protectors. When the voltage applied across the electrodes is lower than the nominal rated value, the varistor is in a high-resistance state, which is equivalent to an open circuit in the circuit. Once the voltage exceeds the nominal voltage, it will instantly break down and turn on, changing from a high-resistance state to a low-resistance state. The working current increases sharply, completing the discharge of high currents. Once the voltage is restored, it can also restore itself to a high-resistance state. If the voltage across the two ends exceeds the maximum limit voltage, the varistor will be completely broken down and have no regeneration ability. This is its sensitivity to voltage.

[0003] In the prior art, an explosion-proof shell is added to the outside of the varistor. When the varistor explodes, it can block the explosion range of the varistor and reduce the danger caused by the explosion of the varistor. However, the explosion-proof shell added to the outside of the existing varistor needs to be fixed with a bolt structure, which is inconvenient to install; in addition, the explosion-proof shell is a rigid structure and cannot play a role in buffering and relieving pressure when the varistor explodes, thereby reducing the risk of shell rupture. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a varistor protective shell to solve the problem that the existing varistor protective shell needs to be fixed with a bolt structure, which is inconvenient to install; and the rigid structure of the protective shell cannot play a role in buffering and relieving pressure when the varistor explodes, thereby reducing the risk of shell rupture.

[0005] To achieve the above purpose, the utility model adopts the following technical solution: a varistor protective shell, comprising a lower shell and an upper shell, the open ends of the lower shell and the upper shell are respectively bent inward to form an inner inclined plate and an outer inclined plate, the end of the inner inclined plate is bent outward to form a clamping plate, the outer side surface of the inner inclined plate is adapted to fit the inner side surface of the outer inclined plate, the end of the outer inclined plate is adapted to be clamped on the inner side of the clamping plate, the bottom end of the upper shell is bent to form a bent plate, the end plate formed on the inner side of the bent plate is pressed against one end of the varistor, and the other end of the varistor is pressed against the inner end surface of the lower shell, and a pin through hole for inserting the pins of the varistor is opened on the curved side surface of the lower shell.

[0006] The beneficial effects of the utility model are as follows: the lower shell and the upper shell can be quickly and firmly connected through the elastic snap-fit ​​of the bent part, so that the varistor can be conveniently protected on the inside; when the varistor explodes, the elastic deformation of the bent plate can achieve the effect of buffering and energy absorption, thereby reducing the risk of the lower shell and the upper shell being broken.

[0007] In order to facilitate the snap-on connection between the lower shell and the upper shell;

[0008] As a further improvement of the above technical solution: the outer inclined plate and the inner inclined plate are both conical plate structures, and the outer diameter of the clamping plate is not greater than the inner diameter of one end of the outer inclined plate facing the lower shell.

[0009] The beneficial effect of this improvement is that the end of the clamping plate can be smoothly docked and inserted into the outer inclined plate, so as to perform subsequent extrusion clamping operations.

[0010] In order to ensure the stability of the connection between the lower shell and the upper shell;

[0011] As a further improvement of the above technical solution: the cross-section of the clamping plate in the axial direction of the lower shell is a U-shaped structure.

[0012] The beneficial effect of this improvement is that the end of the outer inclined plate is clamped in the groove of the clamping plate, and the support of the varistor itself is used to achieve stable positioning of the lower shell and the upper shell in the axial direction.

[0013] In order to ensure the stability of the connection between the lower shell and the upper shell;

[0014] As a further improvement of the above technical solution: the cross-section of the bent plate in the axial direction of the upper shell is a V-shaped structure.

[0015] The beneficial effect of this improvement is that when the lower shell and the upper shell are installed, the end plate is squeezed outward by the varistor, and the bending plate generates elastic energy storage at this time. When the clamping plate moves as a whole to the inner side of the outer inclined plate, the bending plate releases the elastic potential energy, thereby driving the lower shell and the upper shell to move away from each other, and then the outer inclined plate is stably clamped in the clamping plate, completing the stable locking of the lower shell and the upper shell.

[0016] In order to conveniently pass the pins of the varistor through the pin holes;

[0017] As a further improvement of the above technical solution: the pin through hole is arranged to pass through the opening end of the lower shell.

[0018] The beneficial effect of this improvement is that when the varistor is placed into the lower shell from top to bottom, the pins of the varistor can be directly inserted into the inner side of the pin through hole, which effectively reduces the difficulty of installing the varistor.

[0019] In order to fully improve the structural strength of the lower shell;

[0020] As a further improvement of the above technical solution: the bottom surface of the lower shell is evenly provided with reinforcing ribs.

[0021] The beneficial effect of this improvement is that the reinforcing ribs can improve the structural strength of the bottom surface of the lower shell, reducing the risk of the bottom surface of the lower shell being broken after the varistor explodes.

[0022] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional structural diagram of the utility model;

[0024] Figure 2 The structure of the utility model is shown in FIG. Figure 1 ;

[0025] Figure 3 The structure of the utility model is shown in FIG. Figure 2 ;

[0026] Figure 4 It is a structural schematic diagram of the lower housing in the utility model;

[0027] In the figure: 1, lower shell; 11, inner inclined plate; 12, snap-in plate; 13, pin through hole; 2, upper shell; 21, bending plate; 22, end plate; 23, outer inclined plate; 3, varistor; 4, reinforcing rib. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0029] Embodiment 1:

[0030] like Figure 1—4 shows: a varistor protective shell, comprising a lower shell 1 and an upper shell 2, the opening ends of the lower shell 1 and the upper shell 2 are respectively bent inward to form an inner inclined plate 11 and an outer inclined plate 23, the end of the inner inclined plate 11 is bent outward to form a clamping plate 12, the outer side surface of the inner inclined plate 11 is adapted to fit the inner side surface of the outer inclined plate 23, and the end of the outer inclined plate 23 is adapted to be clamped on the inner side of the clamping plate 12, the bottom end of the upper shell 2 is bent to form a bent plate 21, the end plate 22 formed on the inner side of the bent plate 21 is pressed against one end of the varistor 3, and the other end of the varistor 3 is pressed against the inner end surface of the lower shell 1 The curved side surface of the lower shell 1 is provided with a pin through hole 13 for inserting the pins of the varistor 3. The lower shell 1 and the upper shell 2 can be quickly and firmly connected through the elastic snap connection of the bent part, and the varistor 3 is conveniently protected on the inside; when the varistor 3 explodes, the elastic deformation of the bending plate 21 can achieve the effect of buffering and energy absorption, reducing the risk of the lower shell 1 and the upper shell 2 being broken. The outer inclined plate 23 and the inner inclined plate 11 are both conical plate structures. The outer diameter of the snap-in plate 12 is not greater than the inner diameter of the end of the outer inclined plate 23 facing the lower shell 1, and the end of the snap-in plate 12 can be smoothly docked and inserted into the outer inclined plate 2 3, so as to perform subsequent extrusion and clamping operations. The cross-section of the clamping plate 12 in the axial direction of the lower shell 1 is a U-shaped structure, and the end of the outer inclined plate 23 is clamped in the groove of the clamping plate 12, and the support of the varistor 3 itself is used to achieve stable positioning of the lower shell 1 and the upper shell 2 in the axial direction. The cross-section of the bending plate 21 in the axial direction of the upper shell 2 is a V-shaped structure. When the lower shell 1 and the upper shell 2 are installed, the end plate 22 is squeezed outward by the varistor 3. At this time, the bending plate 21 generates elastic energy storage. When the clamping plate 12 moves as a whole to the inner side of the outer inclined plate 23, the bending plate 21 releases the elastic potential energy. This drives the lower shell 1 and the upper shell 2 to move away from each other, so that the outer inclined plate 23 is stably clamped in the clamping plate 12, thereby completing the stable locking of the lower shell 1 and the upper shell 2. The pin through hole 13 is set through the open end of the lower shell 1. When the varistor 3 is placed into the lower shell 1 from top to bottom, the pin of the varistor 3 can be directly inserted into the inner side of the pin through hole 13, which effectively reduces the difficulty of installing the varistor 3. The bottom surface of the lower shell 1 is evenly provided with reinforcing ribs 4, which can improve the structural strength of the bottom surface of the lower shell 1 and reduce the risk of rupture of the bottom surface of the lower shell 1 after the varistor 3 explodes.

[0031] The working principle of the present technical solution is as follows: when installing the present protective shell, firstly, the varistor 3 is placed inside the lower shell 1, so that one side end surface of the varistor 3 is flatly attached to the inner end surface of the lower shell 1, and the pins of the varistor 3 are passed through the pin through-holes 13, and then the upper shell 2 is covered on the upper side of the lower shell 1 and pressed downwardly on the upper shell 2, and the outer inclined plate 23 first contacts the clamping plate 12, and is deformed outwardly under the push of the clamping plate 12, and when the outer inclined plate 23 moves to the lower side of the clamping plate 12, the outer inclined plate 23 releases its elastic potential energy and is pressed tightly against the outer side of the inner inclined plate 11, and at the same time, on the upper During the process of snapping the shell 2 with the lower shell 1, the end plate 22 is supported by the varistor 3 and moves upward, driving the bending plate 21 to produce elastic deformation. When the outer inclined plate 23 moves to the lower side of the clamping plate 12, the bending plate 21 releases part of the elastic potential energy, so that the clamping plate 12 and the outer inclined plate 23 are stably clamped, thereby realizing a stable connection between the lower shell 1 and the upper shell 2; when the varistor 3 explodes, the end plate 22 moves upward under the pressure, causing the bending plate 21 to produce elastic deformation. The deformation of the bending plate 21 achieves the effect of buffering and energy absorption, thereby reducing the risk of the lower shell 1 and the upper shell 2 being broken.

[0032] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0033] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. The above is only the preferred implementation method of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the utility model, they can make several improvements, embellishments or changes, and can also combine the above technical features in an appropriate manner; these improvements, embellishments, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A varistor protective shell, characterized in that: The invention comprises a lower shell (1) and an upper shell (2), wherein the opening ends of the lower shell (1) and the upper shell (2) are respectively bent inward to form an inner inclined plate (11) and an outer inclined plate (23), the end of the inner inclined plate (11) is bent outward to form a clamping plate (12), the outer side surface of the inner inclined plate (11) is adapted to fit the inner side surface of the outer inclined plate (23), and the end of the outer inclined plate (23) is adapted to be clamped on the inner side of the clamping plate (12), the bottom end of the upper shell (2) is bent to form a bent plate (21), the end plate (22) formed on the inner side of the bent plate (21) is pressed against one end of a varistor (3), and the other end of the varistor (3) is pressed against the inner end surface of the lower shell (1), and a pin through hole (13) for inserting the pins of the varistor (3) is provided on the curved side surface of the lower shell (1).

2. The varistor protective shell according to claim 1, characterized in that: The outer inclined plate (23) and the inner inclined plate (11) are both conical plate structures, and the outer diameter of the clamping plate (12) is not greater than the inner diameter of one end of the outer inclined plate (23) facing the lower shell (1).

3. The varistor protective shell according to claim 1, characterized in that: The cross section of the clamping plate (12) in the axial direction of the lower shell (1) is a U-shaped structure.

4. The varistor protective shell according to claim 1, characterized in that: The cross section of the bent plate (21) in the axial direction of the upper shell (2) is a V-shaped structure.

5. The varistor protective shell according to claim 1, characterized in that: The pin through hole (13) is arranged through the opening end of the lower shell (1).

6. The varistor protective shell according to claim 1, characterized in that: The bottom surface of the lower shell (1) is evenly provided with reinforcing ribs (4).

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