Mounting structure of temperature sensor for detecting water temperature of inlet and outlet of water heater for vehicle

Abstract

The utility model relates to a mounting structure of a temperature sensor for detecting water temperature of an inlet and an outlet of a water heater for a vehicle, which is characterized in that a circuit board mounting table is arranged on the inner ring of the side wall of a shell, a sinking hole is arranged in the shell close to the circuit board mounting table, and the depth direction of the sinking hole is vertical to the circuit board mounting table; a temperature sensor welding socket is arranged on the circuit board, and a wiring end of the temperature sensor is inserted and welded with the temperature sensor welding socket, so that the temperature sensor is integrally and vertically fixed at the lower end of the circuit board; the main body part of the temperature sensor is coated with an epoxy resin layer; the circuit board is supported and fixed on the circuit board mounting table, and the temperature sensor is aligned with the center of the counter bore in the shell, and is inserted into the corresponding counter bore in a manner that the temperature sensing probe end faces downwards and is in clearance fit with the counter bore; and heat-conducting silicone grease is filled between the outer wrapping epoxy resin layer of the temperature sensor and the hole wall gap of the sinking hole to form a heat-conducting silica gel layer. According to the mounting structure, the mounting reliability is improved, and the consistency of the insertion position and depth of the temperature sensing probe can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric vehicle temperature control systems, and particularly relates to a mounting structure of a temperature sensor for detecting the inlet and outlet water temperatures of a vehicle water heater. Background Art

[0002] Electric vehicles are the new energy vehicles with the largest output at present. The batteries, motors and other electronic components on electric vehicles require precise temperature control to achieve stable operation of the whole vehicle. The water heater is a closed structure in the temperature control system. It uses water as the heat transfer medium, heats up with electricity, and supplies heat through forced circulation of water pumps. The measurement accuracy and reliability of the inlet and outlet temperatures of the water heater are particularly important. Figure 1 and Figure 2 The terminal of the temperature sensor (using thermistor) is connected to the connector through a wire, the connector is plugged into the circuit board, and the temperature sensor's temperature probe end is wrapped with a small amount of epoxy resin and inserted into the sinking hole filled with thermal grease. Figure 3 In addition to the temperature sensing point ⑤ wrapped in epoxy resin ⑧, this temperature sensor also has a connector ④, a protective cover ⑨, a fixing tie ⑩, and a fixing glue lead Mounting point This solution requires the temperature sensor to be fixed separately, which requires a lot of installation work and the fixing glue is difficult to install. Fixed lead Need to be folded 90° and fixed with glue With lead The connection is prone to aging and failure, and once the lead touches the heating components on the PCBA board, it is easy to melt and fail. In addition, because the position of the temperature sensor relative to the circuit board is not fixed, the insertion depth and direction of the temperature sensor are easily affected by the thermal grease, affecting the measurement accuracy. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides an installation structure for a temperature sensor for detecting the inlet and outlet water temperatures of a vehicle water heater, which is convenient to install, improves the reliability of installation, and improves the consistency of the insertion position and depth of the temperature sensing probe.

[0004] The above-mentioned purpose of the utility model is achieved through the following technical solutions

[0005] A mounting structure of a temperature sensor for detecting the water temperature at the inlet and outlet of a vehicle water heater, comprising a temperature sensor, a circuit board and a housing; characterized in that: a circuit board mounting platform is provided on the inner circle of the side wall of the housing, and a sinking hole for inserting the temperature sensor is provided at a position near the circuit board mounting platform in the housing, and the depth direction of the sinking hole is perpendicular to the circuit board mounting platform; a temperature sensor welding socket is provided on the circuit board, and the wiring terminal of the temperature sensor is inserted and welded to the temperature sensor welding socket, so that the temperature sensor is fixed vertically to the lower end of the circuit board as a whole; the main body of the temperature sensor is wrapped with an epoxy resin layer, and the wrapping length of the epoxy resin layer is greater than the depth of the sinking hole on the housing; the circuit board is supported on the circuit board mounting platform and fixedly connected to the housing by screws, the temperature sensor is aligned with the center of the sinking hole on the housing, and the temperature sensor is inserted into the corresponding sinking hole with the temperature sensing probe end facing downward and in a clearance fit manner; thermal conductive silicone grease is filled between the gap between the epoxy resin layer wrapped outside the temperature sensor and the wall of the sinking hole to form a thermal conductive silicone layer.

[0006] Moreover, the thickness of the epoxy resin layer is 0.5 mm-1.0 mm, and the thickness of the thermal conductive silicone layer is 0.8 mm-1.0 mm.

[0007] The advantages and positive effects of the utility model are:

[0008] 1. The utility model directly welds the terminal of the temperature sensor to the circuit board, so that the temperature sensor is directly fixed vertically to the lower end of the circuit board, and the temperature sensor is positioned and fixed. Compared with the existing method in which the terminal of the temperature sensor is connected to the connector through a wire, and then connected to the circuit board through the connector, the installation of the temperature sensor is simplified, the reliability of the installation is improved, and there is no need to fix the temperature sensor additionally. By positioning and fixing the circuit board on the housing, the alignment of the temperature sensor and the countersunk hole on the housing is ensured, and the consistency of the position and depth of the temperature sensor inserted into the countersunk hole is achieved.

[0009] 2. The utility model increases the wrapping length of the epoxy resin layer, so that the temperature sensor is inserted into the sinking hole in a clearance fit manner, and a small amount of thermal conductive silicone grease is used to fill the gap between the temperature sensor and the hole wall. Under the premise of ensuring the stability of the temperature sensor insertion, the accuracy of temperature measurement is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the arrangement of the water temperature sensors for the inlet and outlet of the traditional heater;

[0011] Figure 2 This is an exploded diagram of the arrangement of the inlet and outlet water temperature sensors of the traditional heater;

[0012] Figure 3It is a traditional temperature sensor structure;

[0013] Figure 4 It is an exploded view of the installation structure of the temperature sensor of the utility model;

[0014] Figure 5 This is a three-dimensional view of the circuit board after the temperature sensor of the utility model is welded;

[0015] Figure 6 This is a side view of the circuit board after the welding temperature sensor of the utility model;

[0016] Figure 7 This is a front view of the installation structure layout of the temperature sensor of the utility model

[0017] Figure 8 yes Figure 7 AA section view;

[0018] In the figure: ① circuit board; ② temperature sensor; ③ sink hole; ④ connector; ⑤ temperature probe end; ⑥ welding point; ⑦ thermal grease; ⑧ epoxy resin layer; ⑨ protective cover; ⑩ fixing tie; Fixing glue; lead; Mounting point. DETAILED DESCRIPTION

[0019] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0020] A mounting structure for a temperature sensor used to detect the inlet and outlet water temperature of a vehicle water heater. Figure 4-Figure 7, the invention point is: it includes a temperature sensor, a circuit board and a shell. The inner circle of the side wall on the shell is provided with a circuit board mounting platform, and a sinking hole for inserting the temperature sensor is provided at a position near the circuit board mounting platform in the shell, and the depth direction of the sinking hole is perpendicular to the circuit board mounting platform. A temperature sensor welding socket is provided on the circuit board, and the wiring terminal of the temperature sensor is inserted and welded to the temperature sensor welding socket, so that the temperature sensor is fixed vertically to the lower end of the circuit board as a whole. The main body of the temperature sensor is wrapped with an epoxy resin layer, and the wrapping length is greater than the depth of the sinking hole on the shell. The wrapping thickness of the epoxy resin layer is 0.5mm-1.0mm, and the rigidity of the temperature sensor installation is improved by the epoxy resin layer. The circuit board is supported on the circuit board mounting platform and fixedly connected to the shell by screws. The temperature sensor is aligned with the center of the sinking hole on the shell, and the temperature sensor is inserted into the corresponding sinking hole with the temperature sensing probe end facing downward and in a clearance fit manner. Thermally conductive silicone grease is filled between the gap between the epoxy resin layer wrapped outside the temperature sensor and the wall of the sink hole to form a thermally conductive silicone layer, so that the temperature sensor is firmly fixed in the sink hole and plays a heat-conducting role. The thickness of the thermally conductive silicone layer is 0.8mm-1.0mm.

[0021] A temperature sensor is installed at the water inlet and the water outlet of the vehicle water heater, and both temperature sensors are vertically fixed to the lower end of the circuit board in the above-mentioned manner. One is used to measure the water inlet temperature, and the other is used to measure the water outlet temperature.

[0022] The specific installation process of the above temperature sensor installation structure is as follows:

[0023] The main part of the temperature sensor excluding the terminal is wrapped with epoxy resin. The wrapping length needs to be greater than the depth of the thermistor installation sink hole. The terminal of the temperature sensor is directly fixed on the circuit board by welding. At this time, welding points will appear on the circuit board, making the circuit board and the temperature sensor one. Then fill a certain amount of thermal conductive silicone grease into the sink hole. Finally, insert the temperature sensor into the sink hole, position the circuit board and support it on the circuit board mounting bar, and fix the circuit board to the housing with screws.

[0024] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A mounting structure of a temperature sensor for detecting the inlet and outlet water temperatures of a vehicle water heater, comprising a temperature sensor, a circuit board and a housing; characterized in that: A circuit board mounting platform is provided on the inner circle of the side wall of the shell, and a sinking hole for inserting the temperature sensor is provided at a position near the circuit board mounting platform in the shell, and the depth direction of the sinking hole is perpendicular to the circuit board mounting platform; a temperature sensor welding socket is provided on the circuit board, and the wiring terminal of the temperature sensor is inserted and welded to the temperature sensor welding socket, so that the temperature sensor is fixed vertically to the lower end of the circuit board as a whole; the main body of the temperature sensor is wrapped with an epoxy resin layer, and the wrapping length of the epoxy resin layer is greater than the depth of the sinking hole on the shell; the circuit board is supported on the circuit board mounting platform and fixedly connected to the shell by screws, the temperature sensor is aligned with the center of the sinking hole on the shell, and the temperature sensor is inserted into the corresponding sinking hole with the temperature sensing probe end facing downward and in a clearance fit manner; thermal conductive silicone grease is filled between the gap between the epoxy resin layer wrapped outside the temperature sensor and the wall of the sinking hole to form a thermal conductive silicone layer.

2. The installation structure of the temperature sensor for detecting the inlet and outlet water temperature of the vehicle water heater according to claim 1, characterized in that: The thickness of the epoxy resin layer is 0.5 mm-1.0 mm, and the thickness of the thermal conductive silicone layer is 0.8 mm-1.0 mm.

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