Liquid leakage sensor

Abstract

The utility model relates to a liquid leakage sensor. The liquid leakage sensor comprises a housing; the PCB substrate is arranged in the shell, and the PCB substrate is provided with an electronic component, a welding spot and a copper-clad through hole; the liquid leakage detection terminal is electrically connected with the PCB substrate, the liquid leakage detection terminal comprises a detection end and a telescopic spring end, one end, extending into the shell, of the detection end is provided with the telescopic spring end, and the telescopic spring end is in contact with a copper-clad through hole in the PCB substrate; and one end of the external connecting line is fixed with a welding spot on the upper surface of the PCB substrate in a welding manner, and the other end of the external connecting line extends out of the shell. According to the utility model, a traditional liquid leakage detection terminal is replaced by the elastic terminal with the telescopic tail part, welding of an external connecting line and the liquid leakage detection terminal is not needed, welding of the liquid leakage detection terminal and the PCB substrate is not needed, multiple processes are saved, the production time of the liquid leakage sensor is saved, the production cost of the liquid leakage sensor is reduced, and the production efficiency of the liquid leakage sensor is improved. And the product yield is improved.

Description

Technical Field

[0001] The utility model relates to a liquid leakage sensor, in particular to a liquid leakage sensor. Background Art

[0002] The production process of traditional liquid leakage sensors is complicated and time-consuming. The specific steps are as follows: first, weld the external connection wire to the terminal of the liquid leakage detection terminal, then weld the liquid leakage detection terminal to the interface of the PCB substrate, and then fix the PCB substrate on the housing of the liquid leakage detection sensor. After the installation is completed, glue is injected into the liquid leakage sensor and wait for the glue to dry and fix naturally. In the production process of traditional liquid leakage sensors, in the process of welding the liquid leakage detection terminal to the PCB substrate, high precision requirements are placed on the horizontal and vertical alignment of the terminal. In addition to the use of external fixtures, manual welding operations also need to ensure that the terminal cannot be offset during welding to ensure the horizontal and vertical accuracy of the terminal, which increases time costs and product defective rates. Machine welding operations require external professional equipment to fix and weld the terminals, which increases production costs. In addition, after the welding is completed, the PCB substrate and the terminal are assembled with the liquid leakage sensor housing, glue filling operations are required. Before the injected glue is dried, the liquid leakage detection terminal must continue to maintain horizontal and vertical alignment. Whether it is manual or machine operation, it is necessary to wait for the glue to dry before performing glue filling operations on the next product, which increases time costs. Utility Model Content

[0003] To this end, the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a liquid leakage sensor, in which the traditional liquid leakage detection terminal is replaced with a retractable elastic terminal at the tail, and there is no need to weld the external connecting wires and the liquid leakage detection terminal, and there is no need to weld the liquid leakage detection terminal and the PCB substrate, thereby saving multiple working steps, saving the production time of the liquid leakage sensor, reducing the production cost of the liquid leakage sensor, and improving the yield of the liquid leakage sensor production products.

[0004] In order to solve the above technical problems, the utility model provides a liquid leakage sensor, comprising:

[0005] shell;

[0006] A PCB substrate is arranged in the housing, and the PCB substrate is provided with electronic components, solder joints and copper-clad through holes;

[0007] A liquid leakage detection terminal is electrically connected to the PCB substrate; the liquid leakage detection terminal comprises a detection end and a retractable spring end, one end of the detection end extending into the housing is provided with a retractable spring end, the retractable spring end extends into the copper-clad through hole of the PCB substrate and is in contact with and connected to the copper-clad through hole;

[0008] An external connecting wire has one end fixed to a soldering point on the upper surface of the PCB substrate by welding, and the other end extending out of the housing.

[0009] In an embodiment of the present invention, both sides of the inner wall of the shell are provided with limiting members for positioning the PCB substrate in the shell.

[0010] In an embodiment of the present invention, the limiting member is an inverted triangle buckle.

[0011] In one embodiment of the present invention, the retractable spring end is a retractable spring pin.

[0012] In one embodiment of the present invention, the leakage detection terminals include two terminals, which are fixed in parallel inside the housing and are located on the same horizontal line.

[0013] In one embodiment of the present invention, the detection ends of the leakage detection terminal extend out of the housing by the same length, so that the end surfaces of the two detection ends remain flush.

[0014] In an embodiment of the present invention, the detection end of the liquid leakage detection terminal is perpendicular to the end surface of the housing.

[0015] In one embodiment of the utility model, the housing is provided with connection terminals, and the external connection wires are connected to the connection terminals in a one-to-one correspondence.

[0016] In one embodiment of the utility model, a glue injection area is provided in the shell, and glue is injected through the glue injection area to fill the entire shell.

[0017] In one embodiment of the present invention, the detection end and the retractable spring end are integrally formed.

[0018] In one embodiment of the present invention, the detection end and the housing are integrally formed by die-casting.

[0019] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0020] The utility model discloses a liquid leakage sensor, which replaces the traditional liquid leakage detection terminal with a retractable elastic terminal at the tail, and does not need to weld the external connecting wire and the liquid leakage detection terminal, and does not need to weld the liquid leakage detection terminal and the PCB substrate, thereby saving multiple working steps, saving the production time of the liquid leakage sensor, and reducing the production cost of the liquid leakage sensor; in the actual assembly process, when the PCB substrate is installed and fixed, the retractable spring end is used, so that the retractable spring end will not be bent due to external force, thereby affecting the tightness of the contact between the PCB substrate and the retractable spring end; in addition, during use, as the use time increases, the liquid leakage detection terminal may also be worn, and there is a greater risk of poor contact. The use of the retractable elastic terminal can always maintain contact with the copper-clad through hole of the PCB substrate, thereby avoiding the poor contact between the PCB substrate and the liquid leakage detection terminal caused by long-term use, and greatly improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0022] Figure 1 It is a schematic diagram of the structure of a liquid leakage sensor that is easy to assemble in a preferred embodiment of the utility model;

[0023] Explanation of the reference numerals in the specification: 1. housing; 11. limiter; 2. PCB substrate; 21. electronic components; 22. solder joints; 23. copper-clad through holes; 3. glue injection area; 4. detection end; 5. retractable spring end; 6. external connecting wires. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1 As shown, the utility model discloses a liquid leakage sensor, comprising: a housing 1; a PCB substrate 2, which is arranged in the housing 1, and the PCB substrate 1 is provided with electronic components 21, solder joints 22 and copper-clad through holes 23; a liquid leakage detection terminal, which comprises a detection end 4 and a retractable spring end 5, and one end of the detection end 4 extending into the housing 1 is provided with a retractable spring end 5, and the retractable spring end 5 extends into and contacts the copper-clad through hole 23 on the PCB substrate 2; an external connection line 6, one end of which is fixed to the solder joint on the upper surface of the PCB substrate 2 by welding, and the other end extends out of the housing 1. The external connection line 6 is connected to the solder joint 22, so as to realize the connection between the liquid leakage detection module on the PCB substrate 2 and the external module.

[0026] The liquid leakage sensor based on the above structure replaces the traditional liquid leakage detection terminal with a retractable elastic terminal at the tail. There is no need to weld the external connecting wire 6 and the liquid leakage detection terminal, and there is no need to weld the liquid leakage detection terminal and the PCB substrate 2, which saves multiple working steps, saves the production time of the liquid leakage sensor, reduces the production cost of the liquid leakage sensor, and improves the yield of the liquid leakage sensor production products.

[0027] Furthermore, both sides of the inner wall of the housing 1 are provided with stoppers 11 for positioning the PCB substrate 2 in the housing 1. The stoppers 11 are inverted triangle buckles, and when the PCB substrate 2 is installed, the PCB substrate 2 is limited to the inverted triangle buckle inside the housing 1 of the liquid leakage detection sensor to ensure that the retractable spring end 5 of the liquid leakage detection terminal is inserted into the copper-clad through hole 23 of the PCB substrate 2 for normal connection.

[0028] The retractable spring end 5 described in this embodiment is a retractable spring pin. In actual use, when the PCB substrate 2 is installed and fixed, the retractable spring end 5 will not be bent due to external force, which will affect the tightness of the contact. In addition, after the PCB substrate 2 is installed in place, the retractable spring pin can always maintain elastic contact with the copper-clad through hole 23. The use of the retractable spring pin can avoid the risk of poor contact between the PCB substrate 2 and the leakage detection terminal due to wear during long-term use, thereby improving the product yield.

[0029] Preferably, the leakage detection terminal includes two terminals, which are fixed in parallel inside the housing 1 and are on the same horizontal line. The detection ends 4 of the leakage detection terminal extend out of the housing 1 by the same length, so that the end faces of the two detection ends 4 remain flush; the detection end 4 of the leakage detection terminal is perpendicular to the end face of the housing 1.

[0030] Furthermore, a glue injection area 3 is provided in the housing 1, and glue is injected into the entire housing 1 through the glue injection area 3. After the glue is injected, the horizontal and vertical alignment of the leakage detection terminal does not need to be maintained manually or by machine until the glue dries naturally.

[0031] In this embodiment, the detection end 4 and the retractable spring end 5 are integrally formed.

[0032] In addition, the detection end 4 and the housing 1 are integrally formed by die-casting.

[0033] The production and processing process of the easy-to-assemble liquid leakage sensor based on the above structure is as follows:

[0034] 1. The housing 1 of the leakage detection sensor is die-casted together with the detection end 4 with a retractable spring needle when the mold is opened. When die-casting, the detection end 4 of the leakage detection terminal faces outward, and the horizontal alignment and vertical alignment of the leakage detection terminal are adjusted by a molding machine;

[0035] 2. Solder the external connection wire 6 directly to the first soldering point 22 of the PCB substrate 2;

[0036] 3. Install the PCB substrate 2 into the housing 1 of the liquid leakage detection sensor, so that the retractable spring pin contacts the copper-clad through hole 23 on the PCB substrate 2, and the position is limited to the inverted triangle buckle inside the housing 1 of the liquid leakage detection sensor to ensure that the retractable spring pin of the liquid leakage detection terminal contacts the copper-clad through hole 23 on the PCB substrate 2 normally;

[0037] 4. Inject glue into the housing 1 through the glue injection area 3, let it stand and allow the glue to dry naturally.

[0038] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A liquid leakage sensor, characterized in that: include: shell; A PCB substrate is arranged in the housing, and the PCB substrate is provided with electronic components, solder joints and copper-clad through holes; A liquid leakage detection terminal is electrically connected to the PCB substrate; the liquid leakage detection terminal comprises a detection end and a retractable spring end, one end of the detection end extending into the housing is provided with a retractable spring end, the retractable spring end extends into the copper-clad through hole of the PCB substrate and is in contact with and connected to the copper-clad through hole; An external connecting wire has one end fixed to a soldering point on the upper surface of the PCB substrate by welding, and the other end extending out of the housing.

2. A liquid leakage sensor according to claim 1, characterized in that: Both sides of the inner wall of the shell are provided with limiting members for positioning the PCB substrate in the shell.

3. A liquid leakage sensor according to claim 2, characterized in that: The limiting member is an inverted triangle buckle.

4. The liquid leakage sensor according to claim 1, characterized in that: The retractable spring end is a retractable spring pin.

5. The liquid leakage sensor according to claim 1, characterized in that: The two liquid leakage detection terminals are fixed in parallel inside the housing and are on the same horizontal line.

6. A liquid leakage sensor according to claim 5, characterized in that: The detection ends of the leakage detection terminals extend out of the housing to the same length, so that the end surfaces of the two detection ends remain flush.

7. A liquid leakage sensor according to claim 6, characterized in that: The detection end of the liquid leakage detection terminal is perpendicular to the end surface of the housing.

8. The liquid leakage sensor according to claim 1, characterized in that: A glue injection area is provided in the shell, and glue is injected through the glue injection area to fill the entire shell.

9. The liquid leakage sensor according to claim 1, characterized in that: The detection end and the retractable spring end are integrally formed.

10. A liquid leakage sensor according to claim 9, characterized in that: The detection end and the housing are integrally formed by die-casting.

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