Mounting structure of temperature sensor for high-pressure liquid heater

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By designing a temperature sensor installation structure for high-pressure liquid heaters, using technical means such as O-ring and compression springs, the problems of poor sealing and low temperature monitoring accuracy in the prior art are solved, and more accurate temperature monitoring and better sealing are achieved.

CN222812480UActive Publication Date: 2025-04-29TIANJIN SANDEN AUTO AIR CONDITIONING

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Patent Information

Application Number: CN202420619693.1
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-03-28
Publication Date: 2025-04-29
Estimated Expiration: 2034-03-28

AI Technical Summary

Technical Problem

In the existing high-pressure liquid heaters, the temperature sensor installation structure has poor sealing properties, resulting in a risk of coolant leakage and low temperature monitoring accuracy.

Method used

A temperature sensor installation structure is designed to cooperate with the T-shaped opening of the main housing by combining the sensor sleeve with the main housing, sealing is achieved using an O-ring, and tight fit between the sensor sleeve and the main housing is ensured by a compression spring and a fixing cover plate to avoid coolant leakage.

Benefits of technology

A temperature sensor in direct contact with the fluid cavity is realized, which improves the accuracy of temperature monitoring, and ensures the sealing of the high-pressure liquid heater through the sealing structure to avoid coolant leakage.

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Abstract

The utility model relates to a mounting structure for a temperature sensor of a high-voltage liquid heater. The mounting structure is integrally inserted and fixed in a T-shaped opening position, corresponding to a fluid cavity, of a main shell of the high-voltage liquid heater. Comprising a sensor sleeve, a sensor, a pressure spring and a fixed cover plate, the outer diameter of a middle flange of the sensor sleeve is greater than the aperture of a small hole of the T-shaped open hole; an O-shaped sealing ring is mounted in an annular groove in the inner section of the flange of the sensor sleeve; the inner section of the sensor sleeve, which is positioned in the flange, is hermetically inserted and matched with the small hole section of the T-shaped opening, and the inner end of the sensor sleeve extends into the fluid cavity; the sensor is inserted and fixed in a center hole of the sensor sleeve; the pressure spring sleeves the outer section of the sensor sleeve, which is positioned on the flange; and the fixed cover plate is fixedly connected with the outer surface of the main shell, so that the compression spring sleeve is compressed on the outer end surface of the flange at the sensor sleeve position. According to the mounting structure, the accuracy of temperature monitoring is improved, and mounting leakage is avoided.

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Description

Technical Field

[0001] The utility model belongs to the technical field of heaters, and in particular relates to a mounting structure of a temperature sensor for a high-pressure liquid heater. Background Art

[0002] New energy vehicles do not have the advantage of traditional fuel vehicles that can use the engine's waste heat to provide a heat source. New energy vehicles need to use electric heaters to provide heat for the cabin or adjust the temperature of the battery pack. At present, the heating system equipped with new energy vehicles is mainly a high-voltage liquid heater. The high-voltage liquid heater has components such as an electrical control board (PCB), a heating device, and a temperature sensor. It can be divided into two parts: an electrical cavity and a fluid cavity. Because the output power of the heating unit is controlled and adjusted by the control board, it is necessary to monitor the water temperature changes in the fluid cavity. Currently, the water temperature changes in the fluid cavity are generally monitored by attaching the sensor to the surface of the main shell for temperature collection. This temperature monitoring method does not directly contact the coolant and has low monitoring accuracy.

[0003] In order to more accurately monitor the actual temperature of the coolant, the best way is to place the sensor probe inside the fluid cavity to fully contact the coolant. However, because there is high-voltage DC on the electrical control board, the fluid cavity needs to achieve good sealing to ensure that there is no coolant leakage. Therefore, designing a temperature sensor installation method that can achieve a good sealing effect at the interface of the fluid cavity is a key issue in solving the risk of leakage at the interface of the existing fluid cavity. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a mounting structure for a temperature sensor of a high-pressure liquid heater which can improve the accuracy of monitoring the temperature of the coolant and ensure that the coolant in the fluid cavity does not leak.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] A mounting structure for a temperature sensor of a high-voltage liquid heater, wherein the temperature sensor is integrally inserted and fixed to a T-shaped opening position of a main housing of the high-voltage liquid heater corresponding to a fluid cavity; the structure comprises a sensor sleeve, a sensor, a wire, a wiring harness connector, a compression spring, and a fixed cover plate;

[0007] The sensor sleeve is a cylindrical sleeve with a flange in the middle, and the central hole of the sensor sleeve is a blind hole connected to the outer end; the outer diameter of the flange of the sensor sleeve is larger than the small hole diameter of the T-shaped opening on the main shell, and an annular groove is provided on the inner section of the sensor sleeve located at the flange, and an O-ring is installed in the annular groove; the inner section of the sensor sleeve located at the flange is sealed and plugged with the small hole section of the T-shaped opening, and its inner end extends into the fluid cavity;

[0008] The sensor is inserted and fixed in the center hole of the sensor sleeve in a manner that the wiring terminal is exposed and contacts the bottom of the center hole of the sensor sleeve, the wiring terminal of the sensor is connected to one end of the wire, and the other end of the wire is connected to the wiring harness connector;

[0009] The compression spring sleeve is arranged on the outer section of the sensor sleeve located on the flange; the fixed cover plate is fitted with the outer end gap of the sensor sleeve through its center hole, and the fixed cover plate is fixedly connected to the outer surface of the main shell, so that the compression spring sleeve is pressed against the outer end surface of the flange of the sensor sleeve.

[0010] Moreover, epoxy resin is injected between the hole wall of the central hole of the sensor sleeve and the outer surface of the sensor, so that the sensor is fixed in the sensor sleeve.

[0011] Moreover, the sensor sleeve is made of SUS304, the sensor is made of a thermistor, the compression spring is made of SWOSC-V, the fixed cover plate is made of SPCC, and the thickness of the fixed cover plate is 1 mm.

[0012] Moreover, the compression spring is a conical coil spring, the small diameter end of the conical coil spring is in compression contact with the outer end surface of the flange of the sensor sleeve, and the large diameter end of the conical coil spring is in compression contact with the inner end of the fixed cover plate.

[0013] Moreover, screw holes are arranged on opposite sides of the center hole on the fixed cover plate, and the two screw holes are aligned with two threaded holes arranged on the periphery of the opening on the main shell. The fixed cover plate is fixed to the outer surface of the main shell by installing screws.

[0014] Moreover, limit slots are symmetrically arranged on both sides of the center hole in a direction perpendicular to the midpoint of the line connecting the two screw insertion holes on the fixed cover plate, and limit columns are arranged at corresponding positions on the outer surface of the main shell body, and the two limit slots respectively form insertion limit cooperation with the two limit columns.

[0015] Furthermore, a sleeve is provided on the outside of the conductive wire.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. The utility model directly inserts the sensor probe into the fluid cavity through the sensor sleeve to contact the coolant. Compared with the method of attaching the sensor to the surface of the main shell to collect temperature, it achieves a more accurate effect of temperature collection.

[0018] 2. The utility model installs an O-ring at the opening matching position of the sensor sleeve and the main housing, and the O-ring is used to achieve sealing, thereby preventing the leakage of the coolant at the opening position of the fluid cavity, thereby ensuring the sealing of the high-pressure liquid heater;

[0019] 3. The utility model sets a flange in the middle of the sensor sleeve to form a compression spring action surface, and utilizes the elastic deformation of the compression spring to apply elastic force on the outer end surface of the flange, thereby achieving a close fit between the end cover of the sensor sleeve and the main housing, and better ensuring that the coolant in the fluid cavity does not leak;

[0020] 4. The utility model sets relative limiting grooves on the fixed cover plate, which cooperate with the limiting columns on the surface of the main shell, which facilitates installation on the one hand and can limit the displacement of the fixed cover plate due to vibration on the other hand, thereby realizing stable and firm installation of the temperature sensor.

[0021] 5. The utility model sets a sleeve on the outside of the guide to play the role of heat insulation and scratch prevention, and avoid harm to personnel during the installation of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the utility model (the O-ring is not shown in the figure);

[0023] Figure 2 It is a front view of the utility model (the O-ring is not shown in the figure);

[0024] Figure 3 It is a top view of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the sensor jacket in the utility model;

[0026] Figure 5 It is a structural schematic diagram of the fixed cover plate of the utility model;

[0027] Figure 6 It is the installation diagram of the utility model;

[0028] Figure 7 yes Figure 6 AA partial section view in. DETAILED DESCRIPTION

[0029] 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.

[0030] A mounting structure for a temperature sensor of a high pressure liquid heater, see Figure 1-Figure 6 The temperature sensor is integrally inserted and fixed to the T-shaped opening position of the main housing 8 of the high-voltage liquid heater corresponding to the fluid chamber 8.1. On the basis of ensuring accurate temperature acquisition, the risk of poor sealing caused by the opening of the main housing is solved. The specific implementation plan is as follows:

[0031] The temperature sensor mainly includes a sensor sleeve 1, a sensor 7, a wire 4, a sleeve 5, a wiring harness connector 6, a compression spring 2, a fixed cover plate 3, etc.;

[0032] The sensor sleeve is made of SUS304 material, which is a cylindrical sleeve with a flange 1.1 in the middle. The central hole of the sensor sleeve is a blind hole connected to the outer end, which is used to insert the thermistor and is the thermistor mounting hole. The outer diameter of the flange of the sensor sleeve is larger than the small hole diameter of the T-shaped opening on the main shell, and smaller than the large hole diameter of the T-shaped opening.

[0033] The outer section of the sensor sleeve located on the flange is the spring installation section 1.3, which is used to fit the conical coil spring. The inner section of the sensor sleeve located on the flange is the installation matching section 1.4, which is used to be inserted and matched with the small hole section of the T-shaped opening on the shell, and the long section of the installation matching section is larger than the long section of the small hole section of the T-shaped opening on the shell, so that the inner end of the installation matching section can extend into the fluid cavity. An annular groove 1.2 is provided on the installation matching section, which is used to install the O-ring 9. Through the O-ring, the sensor sleeve is sealed and inserted with the T-shaped opening. For example, the width * depth of the annular groove is 2.5mm * 1.35mm, and the depth dimension 1.35mm is smaller than the wire diameter of the O-ring, ensuring that the O-ring has a certain amount of compression.

[0034] The sensor uses a thermistor as the core temperature measurement element, which is inserted into the center hole of the sensor sleeve with the wiring terminal exposed. The distance between the insertion end of the sensor and the bottom of the center hole of the sensor sleeve is ≤0.5mm, preferably in contact.

[0035] , ensuring that the sensor probe neither touches the heating rod in the fluid cavity nor is hidden in the opening of the main shell hole, so as to achieve accurate measurement of the coolant temperature.

[0036] Epoxy resin is injected between the hole wall of the center hole of the sensor sleeve and the outer surface of the sensor to firmly fix the thermistor in the center hole of the sensor sleeve and ensure that the thermistor is in a closed and clean cavity. The terminal of the thermistor is connected to a wire, and the other end of the wire is connected to a wire harness connector for easy plug-in. The outer sleeve of the wire is provided with a sleeve, which takes into account the safety hazards of the operator. The installation of the sleeve can play a role of heat insulation and avoid burns and other hazards to personnel.

[0037] The compression spring is preferably a conical coil spring made of SWOSC-V material. The compression spring is sleeved on the spring mounting section of the sensor sleeve with the small end facing inward and the large end facing outward, which better adapts to the different areas of the flange end of the sensor sleeve and the fixed cover plate. At the same time, the elastic force generated by the elastic deformation of the spring is applied to the outer end surface of the flange of the sensor sleeve, so as to achieve a close fit between the sensor sleeve and the main shell, thereby enhancing the sealing effect of the opening of the main shell.

[0038] Evenly applying anti-rust oil on the surface of the conical coil spring can reduce the risk of spring oxidation and rust, which may reduce the service life of the spring. Before applying anti-rust oil, the spring needs to be shot peened to remove rust on the surface of the spring.

[0039] The fixed cover plate is used to realize the fixed pressing of the sensor sleeve on the opening position of the main shell, and the SPCC material is adopted, and the thickness is 1mm. The fixed cover plate is provided with a center hole 3.3, and the aperture of the center hole is larger than the outer diameter of the spring mounting section of the sensor sleeve. Screw insertion holes 3.1 are provided on the fixed cover plate on opposite sides of the center hole, and the screw insertion holes are aligned with the two threaded holes provided on the periphery of the opening of the main shell. By installing the screws 10, the fixed cover plate is fixedly connected to the outer surface of the main shell, and forms a compression contact with the outer end of the compression spring. Further, the fixed cover plate is symmetrically provided with a limited slot 3.2 on both sides of the center hole in the direction perpendicular to the midpoint of the connecting line of the two screw insertion holes, and a limited column is provided at a corresponding position on the outer surface of the main shell, and the two limited columns are respectively inserted into the corresponding limited slots, which can facilitate the installation of the fixed cover plate on the one hand, and can limit the displacement of the fixed cover plate with vibration on the other hand, thereby ensuring the firmness of the connection between the fixed cover plate and the outer shell.

[0040] The fixed cover plate is connected to the main housing by screws. Compared with the gluing method, the high and low temperature resistance of the bolt connection ensures that the temperature sensor is firmly installed and the coolant does not leak.

[0041] The installation method of the temperature sensor for the high-pressure liquid heater is:

[0042] First, insert the sensor into the sensor sleeve, inject epoxy resin into the gap between the two, and solidify the resin to achieve a fixed connection between the two; then put a sleeve on the outside of the external wire of the sensor; then put an O-ring in the annular groove on the sensor sleeve, and the O-ring is pre-smeared with lubricating grease; then insert the sensor sleeve and the sensor assembly into the T-shaped opening position on the main shell; then set the compression spring on the external spring mounting section of the sensor sleeve; then fit the center hole of the fixed cover plate with the upper end of the sensor sleeve, and form a positioning match between the two limit slots on the fixed cover plate and the two limit columns on the main shell, align the two end screw holes on the fixed cover plate with the two threaded holes on the main shell, and screw in the connecting screws, apply the set torque, and achieve a close fit between the fixed cover plate and the main shell to ensure good sealing; finally, connect the wiring harness connector to the outer end of the wire, and insert the wiring harness connector into the corresponding socket of the control board on the high-pressure liquid heater, so as to realize the transmission function of temperature information.

[0043] 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 for a temperature sensor of a high-pressure liquid heater, characterized in that: The temperature sensor is integrally inserted and fixed to the main housing of the high-voltage liquid heater at a T-shaped opening position corresponding to the fluid cavity; it includes a sensor sleeve, a sensor, a wire, a wiring harness connector, a compression spring, and a fixed cover plate; The sensor sleeve is a cylindrical sleeve with a flange in the middle, and the central hole of the sensor sleeve is a blind hole connected to the outer end; the outer diameter of the flange of the sensor sleeve is larger than the small hole diameter of the T-shaped opening on the main shell, and an annular groove is provided on the inner section of the sensor sleeve located at the flange, and an O-ring is installed in the annular groove; the inner section of the sensor sleeve located at the flange is sealed and plugged with the small hole section of the T-shaped opening, and its inner end extends into the fluid cavity; The sensor is inserted and fixed in the central hole of the sensor sleeve in a manner that the wiring terminal is exposed, the wiring terminal of the sensor is connected to one end of the wire, and the other end of the wire is connected to the wiring harness connector; The compression spring sleeve is arranged on the outer section of the sensor sleeve located on the flange; the fixed cover plate is fitted with the outer end gap of the sensor sleeve through its center hole, and the fixed cover plate is fixedly connected to the outer surface of the main shell, so that the compression spring sleeve is pressed against the outer end surface of the flange of the sensor sleeve.

2. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 1, characterized in that: Epoxy resin is injected between the hole wall of the central hole of the sensor sleeve and the outer surface of the sensor to fix the sensor in the sensor sleeve.

3. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 1, characterized in that: The sensor sleeve is made of SUS304, the sensor is a thermistor, the compression spring is made of SWOSC-V, the fixed cover is made of SPCC, and the thickness of the fixed cover is 1 mm.

4. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 1, characterized in that: The compression spring is a conical coil spring, the small diameter end of the conical coil spring is in compression contact with the outer end surface of the flange of the sensor sleeve, and the large diameter end of the conical coil spring is in compression contact with the inner end of the fixed cover plate.

5. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 1, characterized in that: Screw holes are arranged on opposite sides of the central hole of the fixed cover plate. The two screw holes are aligned with two threaded holes arranged on the periphery of the opening of the main shell. The fixed cover plate is fixed to the outer surface of the main shell by installing screws.

6. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 5, characterized in that: Limiting slots are symmetrically arranged on both sides of the center hole in a direction perpendicular to the midpoint of the line connecting the two screw insertion holes on the fixed cover plate, and limiting columns are arranged at corresponding positions on the outer surface of the main shell. The two limiting slots respectively form insertion limiting cooperation with the two limiting columns.

7. The installation structure of the temperature sensor for the high-pressure liquid heater according to claim 1, characterized in that: A sleeve is sheathed on the outside of the wire.