PTC (Positive Temperature Coefficient) shell airtight test tool clamp

Abstract

The utility model discloses a PTC housing airtight test tool clamp, a housing comprises a box body, the end side of the box body is provided with an air inlet pipe and an air outlet pipe, the bottom of the other side of the box body is provided with a protruding part, and the protruding part is provided with a power interface; a rear backup plate is fixed to the side, corresponding to the shell, of the upper side of the bottom plate, a front backup plate is fixed to the other side, corresponding to the shell, of the upper side of the bottom plate, a supporting plate for supporting the box body is fixed to the upper side of the bottom plate, airtight plugs are fixed to the output ends of the first air cylinder assemblies, and air holes for inflation and deflation are formed in the ends and the side walls of the airtight plugs. And the air inlet pipe and the air outlet pipe are sealed by the airtight plug under the driving of the first air cylinder assembly. The tool clamp is matched with the corresponding PTC shell, the shell is directly placed in an inner groove of the tool clamp during detection, the air inlet pipe and the air outlet pipe are automatically aligned through the driving effect of the air cylinder assembly, meanwhile, fixing of the shell is completed, and detection is accurate and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of airtightness detection tooling, and particularly relates to a PTC shell airtightness test tooling fixture. Background Technique

[0002] The PTC air heater heating system is a common heating method in new energy vehicles, especially in pure electric vehicles. Since electric vehicles do not have the waste heat generated by internal combustion engines, an independent heating system is required. PTC refers to positive temperature coefficient, and the resistance of this material increases with the increase of temperature. The working principle is to utilize this characteristic of the PTC material to generate heat by passing current through the PTC element. When the PTC element is heated, its resistance value increases with the increase of temperature, thereby limiting the further increase of current and achieving a self-regulating effect to maintain a constant temperature output. In new energy vehicles, the PTC air heater usually consists of a PTC element, a heat sink, and a shell. The PTC element is the core component responsible for heating; the heat sink is used to dissipate heat; and the shell protects the heater and prevents dangers such as electric shock.

[0003] The shell used for the outer layer of the PTC element needs to be subjected to airtightness detection before leaving the factory. The shell is composed of an upper shell and a lower shell, and there are two air holes at the corresponding ends, which are used as the air inlet hole and the air outlet hole. When detecting the airtightness, the shell needs to be fixed, and then inflated through a single air hole, and the other air hole is used for air outlet. A pressure detection device is installed at the air outlet end. After inflating the corresponding shell interior, observe the change of air pressure. If the value remains unchanged within a certain period of time, it proves that the airtightness is good. The utility model mainly prepares an airtightness detection tooling fixture for the PTC shell, which is used to fix the shell, facilitate air charging and discharging, and improve the accuracy of airtightness detection. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a PTC shell airtightness test tooling fixture, which is used to fix the shell, facilitate air charging and discharging, and improve the accuracy of airtightness detection.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] A PTC shell airtightness test tooling fixture, the shell includes a box body, the side of the box body is provided with an air inlet pipe and an air outlet pipe, and the bottom of the other side of the box body has a protruding part, and a power supply interface is arranged on the protruding part;

[0007] It includes a bottom plate. On the upper side of the bottom plate, a rear backrest is fixed corresponding to one side of the outer shell, and a front backrest is fixed corresponding to the other side of the outer shell. The outer shell is located between the front backrest and the rear backrest. A support plate for supporting the box body is fixed on the upper side of the bottom plate. The support plate is horizontally arranged, and a groove for accommodating the protruding part is formed between the side of the support plate and the rear backrest.

[0008] At the positions corresponding to the air inlet pipe and the air outlet pipe on the front backrest, first cylinder assemblies are installed respectively. The output ends of the first cylinder assemblies face the air inlet pipe and the air outlet pipe respectively. Airtight plugs are fixed at the output ends of the first cylinder assemblies. The airtight plugs are of a cylindrical structure, and air holes for air charging and discharging are opened at the end and the side wall. The airtight plugs seal the air inlet pipe and the air outlet pipe through the drive of the first cylinder assemblies.

[0009] Furthermore, a second cylinder assembly is installed between the lower side of the support plate and the upper side of the bottom plate. A clamping plate is fixed at the corresponding output end of the second cylinder assembly. The clamping plate corresponds to the protruding part, and a sealing plug is fixed at the part of the clamping plate corresponding to the power interface.

[0010] Furthermore, positioning plates are fixed at the positions corresponding to the air inlet pipe and the air outlet pipe on the support plate. The positioning plates respectively have positioning grooves for accommodating the air inlet pipe and the air outlet pipe. The positioning grooves are semi-circular arc-shaped grooves.

[0011] On the upper side of the positioning plate, there is a limiting plate. The two sides of the limiting plate are driven by a third cylinder assembly to drive the limiting plate to approach or move away from the upper side of the positioning plate. The limiting plate has a limiting groove at the position corresponding to the positioning groove. Ball bearings are installed on the inner side walls of the positioning groove and the limiting groove.

[0012] The corresponding end of the airtight plug has a rubber ring for contacting the pipe orifice parts of the air inlet pipe and the air outlet pipe. On the bottom plate, side plates are provided corresponding to both sides of the box body.

[0013] The utility model has the following beneficial effects:

[0014] The side wall air holes corresponding to a single airtight plug are communicated with the air charging assembly, and the side wall air holes corresponding to the other airtight plug are communicated with the air pressure sensor. The end air holes are used to communicate with the inside of the box body through the air inlet pipe. Gas enters the inside of the box body through the air inlet pipe, and the gas is transmitted to the air pressure sensor through the exhaust pipe, so that the air pressure sensor detects that the air pressure is the same as the air pressure inside the box body.

[0015] The tooling fixture matches the corresponding PTC outer shell. During detection, the outer shell can be directly placed in the inner groove of the tooling fixture. By using the driving effect of the cylinder assembly, the air inlet pipe and the air outlet pipe are automatically aligned, and at the same time, the outer shell is fixed. The detection is accurate and convenient. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments.

[0017] Figure 1 : Schematic structural diagram of the present utility model's tooling fixture in the clamped state.

[0018] Figure 2 : Schematic structural diagram of the housing of the present utility model.

[0019] Figure 3 : Schematic structural diagram of the bottom of the housing of the present utility model.

[0020] Figure 4 : Schematic structural diagram of the present utility model's tooling fixture in the disassembled state.

[0021] In the drawings, the list of components represented by each reference numeral is as follows: box body 1, air inlet pipe 11, air outlet pipe 12, protruding part 13, power supply interface 14, bottom plate 2, rear support plate 21, front support plate 22, support plate 23, first cylinder assembly 3, airtight plug 31, second cylinder assembly 4, clamping plate 41, sealing plug 42, positioning plate 5, positioning groove 51, limiting plate 61, third cylinder 6, ball 52, rubber ring 32, side plate 24. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] As Figures 1-3 shown: A PTC housing airtight test tooling fixture, the housing includes a box body 1, the box body 1 has an air inlet pipe 11 and an air outlet pipe 12 at the end side, and a protruding part 13 at the bottom of the other side of the box body 1, and a power supply interface 14 is provided on the protruding part 13;

[0024] It includes a bottom plate 2. A rear support plate 21 is fixed on the upper side of the bottom plate 2 corresponding to one side of the housing, and a front support plate 22 is fixed corresponding to the other side of the housing. The housing is located between the front support plate 22 and the rear support plate 21. A support plate 23 for supporting the box body 1 is fixed on the upper side of the bottom plate 2. The support plate 23 is horizontally arranged. A groove for accommodating the protruding part 13 is formed between the side of the support plate 23 and the rear support plate 21; The support plate is used to support the horizontal part of the bottom of the box body, so that the box body is horizontally installed corresponding to the bottom plate. Among them, the protruding part is located in the groove part, and through the supporting effect of the support plate, the box body is elevated, and the elevated part is used to accommodate the protruding part.

[0025] A first cylinder assembly 3 is installed at the positions of the front backrest 22 corresponding to the intake pipe 11 and the exhaust pipe 12. The output ends of the first cylinder assemblies are horizontally arranged to provide a driving effect in the horizontal direction. The output ends of the first cylinder assemblies 3 are respectively facing the intake pipe 11 and the exhaust pipe 12. An airtight plug 31 is fixed to the output end of each first cylinder assembly 3. The airtight plug 31 is a cylindrical structure, and air holes for air charging and discharging are provided at the end and the side wall. The airtight plug 31 seals the intake pipe 11 and the exhaust pipe 12 through the drive of the first cylinder 3 assembly.

[0026] The first cylinder assembly is used to drive the airtight plug at the end to move horizontally. The airtight plug faces the pipe orifices of the intake pipe and the exhaust pipe. Through the drive of the first cylinder assembly, the end of the airtight plug covers and seals the intake pipe and the exhaust pipe respectively. The air holes at the end and the side wall of the airtight plug are connected through an internal pipeline.

[0027] The side wall air hole corresponding to a single airtight plug is connected to an inflation assembly, and the side wall air hole corresponding to the other airtight plug is connected to a pressure sensor. The end air hole is used to communicate with the inside of the box body through the intake pipe. Gas enters the inside of the box body through the intake pipe and is transmitted to the pressure sensor through the exhaust pipe, so that the pressure sensor detects that the pressure is the same as the pressure inside the box body.

[0028] When detecting the airtightness of the outer shell, under the inflation action of the inflation assembly, the pressure inside the box body is increased to a certain value, and the pressure sensor is observed. If the value is stable within the specified time, it proves that the airtightness of the outer shell is good. If there is a leakage phenomenon, the detected value of the pressure sensor will decrease.

[0029] As Figure 4 shown: A second cylinder assembly 4 is installed between the lower side of the support plate 23 and the upper side of the bottom plate 2. A clamping plate 41 is fixed to the corresponding output end of the second cylinder assembly 4. The clamping plate 41 corresponds to the protruding part 13. A sealing plug 42 is fixed to the part of the clamping plate 41 corresponding to the power interface 14. The protruding part corresponding to the bottom of the box body is used to install the power interface. When the box body is placed on the support plate, it is positioned by the clamping plate. The clamping plate moves towards the protruding part under the drive of the second cylinder assembly, and the sealing plug partially coincides with the power interface. The sealing plug is made of rubber and is used to prevent damage to the power interface. After the clamping plate moves, it is clamped on both sides by the backrest plate to make the whole shell stable, facilitating the positioning of the airtight plug corresponding to the intake pipe.

[0030] A positioning plate 5 is fixed at the position of the support plate 23 corresponding to the intake pipe 11 and the outlet pipe 12. The positioning plate 5 correspondingly has a positioning groove 51 for accommodating the intake pipe 11 and the outlet pipe 12, and the positioning groove 51 is a semi-circular arc-shaped groove body, which is convenient for positioning during the installation of the housing. There is a limiting plate 61 on the upper side of the positioning plate 5, and both sides of the limiting plate 61 are driven by a third cylinder 6 assembly for driving the limiting plate 61 to approach or move away from the upper side of the positioning plate 5. The limiting plate 61 has a limiting groove corresponding to the position of the positioning groove 51, and ball bearings 52 are installed on the inner side walls of the positioning groove 51 and the limiting groove. Driving the third cylinder assembly to make the limiting plate and the positioning plate approach each other, and the corresponding positioning groove and limiting groove clamp the side walls of the intake pipe and the outlet pipe. In order to prevent friction between the intake pipe and the outlet pipe during the driving process of the first cylinder assembly, the ball bearings in the corresponding positioning groove and limiting groove can prevent scratches under the clamping action.

[0031] As Figure 1 shown: The airtight plug 31 has a rubber ring 32 at the corresponding end for contacting the pipe orifice parts of the intake pipe 11 and the outlet pipe 12. The rubber ring is annular and is used to deform after contacting the pipe orifice position to improve airtightness. The bottom plate 2 has side plates 24 on both sides corresponding to the box body 1. The side plates are used for side protection and limiting functions.

[0032] This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. A PTC housing airtight test tooling fixture, the housing includes a box body (1), the end side of the box body (1) is provided with an air inlet pipe (11) and an air outlet pipe (12), and the bottom of the other side of the box body (1) has a protruding part (13), and a power interface (14) is arranged on the protruding part (13); characterized in that: It includes a bottom plate (2), a rear support plate (21) is fixed on the upper side of the bottom plate (2) corresponding to one side of the housing, and a front support plate (22) is fixed corresponding to the other side of the housing. The housing is located between the front support plate (22) and the rear support plate (21). A support plate (23) for supporting the box body (1) is fixed on the upper side of the bottom plate (2). The support plate (23) is horizontally arranged, and a groove for accommodating the protruding part (13) is formed between the side of the support plate (23) and the rear support plate (21); The first cylinder assemblies (3) are installed at the positions of the front support plate (22) corresponding to the air inlet pipe (11) and the air outlet pipe (12). The output ends of the first cylinder assemblies (3) are respectively facing the air inlet pipe (11) and the air outlet pipe (12). Airtight plugs (31) are fixed at the output ends of the first cylinder assemblies (3). The airtight plugs (31) are cylindrical structures, and air holes for air charging and discharging are opened at the ends and side walls. The airtight plugs (31) are driven by the first cylinder assemblies (3) to seal the air inlet pipe (11) and the air outlet pipe (12).

2. The airtight test fixture for a PTC housing according to claim 1, characterized in that: A second cylinder assembly (4) is installed between the lower side of the support plate (23) and the upper side of the bottom plate (2). A clamping plate (41) is fixed at the corresponding output end of the second cylinder assembly (4). The clamping plate (41) corresponds to the protruding part (13), and a sealing plug (42) is fixed at the part of the clamping plate (41) corresponding to the power interface (14).

3. The PTC housing airtight test fixture according to claim 1, wherein: Positioning plates (5) are fixed at the positions of the support plate (23) corresponding to the air inlet pipe (11) and the air outlet pipe (12). The positioning plates (5) are correspondingly provided with positioning grooves (51) for accommodating the air inlet pipe (11) and the air outlet pipe (12). The positioning grooves (51) are semi-circular arc-shaped grooves.

4. The PTC housing airtight test tooling fixture according to claim 3, characterized in that: A limiting plate (61) is arranged on the upper side of the positioning plate (5). The two sides of the limiting plate (61) are driven by a third cylinder (6) assembly to drive the limiting plate (61) to approach or move away from the upper side of the positioning plate (5). The limiting plate (61) has a limiting groove at the position corresponding to the positioning groove (51). Ball bearings (52) are installed on the inner side walls of the positioning groove (51) and the limiting groove.

5. The PTC housing airtightness testing tooling fixture according to claim 1, characterized in that: The airtight plug (31) is correspondingly provided with a rubber ring (32) at the end for contacting the pipe orifice parts of the air inlet pipe (11) and the air outlet pipe (12).

6. The airtight test fixture for a PTC housing according to claim 1, characterized in that: Side plates (24) are arranged on the bottom plate (2) corresponding to both sides of the box body (1).

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