A temperature sensing mechanism for a sensor

Abstract

The present invention relates to the field of sensor technology, and specifically to a temperature sensing mechanism for a sensor, comprising a shell, a joint is provided on one side of the shell; a port ring groove is provided on the joint, a mounting ring groove is provided along the bottom wall of the port ring groove, a temperature sensing element protective tube assembly is provided in the mounting ring groove; the temperature sensing element protective tube assembly comprises a temperature sensing element protective tube capable of accommodating a temperature sensing element, and an annular seat sleeve that can be sleeved on the outer wall of the temperature sensing element protective tube and can form a crimping connection with the side wall of the mounting ring groove; a temperature sensing element through hole that can connect the element installation area and the mounting ring groove is provided on the shell; the temperature sensing element enters the temperature sensing element protective tube through the temperature sensing element through hole. The assembly of the temperature sensing element protective tube assembly and the shell is realized by modular assembly, which can not only reduce the process difficulty and production cost, but also realize the crimping connection of temperature sensing element protective tube assemblies of different specifications with the shell.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensor testing, and in particular to a temperature sensing mechanism for a sensor. Background Art

[0002] A sensor is a detection device that can sense the information being measured and can convert the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control. Its types include pressure sensors, temperature sensors, etc. Among them, a pressure sensor is a device or device that can sense pressure signals and convert pressure signals into usable output electrical signals according to certain rules. It is usually composed of a pressure sensitive element and a signal processing unit, and is widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines, etc. Its working principle can be roughly divided into three steps: sensing pressure, converting signals, and outputting signals. Specifically, when pressure acts on a sensitive element, the sensitive element will deform, and the degree of deformation is proportional to the magnitude of the pressure. After sensing the change in pressure, the pressure sensor will convert this change into an electrical signal. The conversion method may include measuring changes in resistance, capacitance or inductance. Finally, the pressure sensor outputs the converted electrical signals to external devices for processing. These signals can be analog signals or digital signals.

[0003] The temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. It is the core part of the temperature measuring instrument. Its working principle is mainly based on the thermoelectric effect, resistance effect, thermistor effect, thermal resistor effect, thermocouple effect, infrared absorption effect, etc. of the material, which converts the temperature signal into an electrical signal.

[0004] However, in some special cases, it is necessary to measure the temperature and pressure of the liquid or gas in the test environment at the same time. If the temperature sensor and pressure sensor are installed at the same time, the interface of the device to be tested or the space will affect the sensing. In view of this, the integrated temperature and pressure sensor with both temperature sensing and pressure sensing came into being.

[0005] A Chinese invention patent with publication number CN107817015A discloses an integrated pressure and temperature sensor, which forms a tubular cavity for accommodating a temperature sensing element and protecting it from environmental influences by opening a first cavity and a tubular hole that are interconnected at the sensor port and forming a seal at the end of the tubular hole.

[0006] In actual production, the structure for accommodating the temperature sensing element provided by the above scheme has strict processing requirements for the depth and diameter of the tubular hole, and because it uses a direct hole opening on the sensor port, it further increases the complexity of the process, thereby reducing production efficiency. In addition, since the elements used for temperature sensing have various specifications, if the above scheme is adopted, it will result in the need to open different tubular holes for temperature sensing elements of different specifications (mainly in the external space occupied by the temperature sensing element), and then it is necessary to develop sensor ports with tubular holes of different specifications, further increasing production costs.

[0007] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned problems of the prior art and to provide a temperature sensing mechanism for a sensor, which is used to solve the technical problems that traditional temperature sensors have great processing difficulty and high process requirements due to the integral molding of the cavity for accommodating the temperature sensing element and the shell, and cannot adapt to temperature sensing elements of different specifications because the specifications of the cavity cannot be changed.

[0009] The above objectives are achieved through the following technical solutions:

[0010] A temperature sensing mechanism for a sensor, comprising a shell, one side of the shell being used as a component installation area, and the other side of the shell being provided with a joint; a port ring groove extending to an end is provided on the joint, and a mounting ring groove is provided along the bottom wall of the port ring groove, and a temperature sensing component protection tube assembly is provided in the mounting ring groove;

[0011] The temperature sensing element protection tube assembly comprises a temperature sensing element protection tube capable of accommodating the temperature sensing element, and an annular seat sleeve capable of being sleeved on the outer wall of the temperature sensing element protection tube and capable of forming a crimping connection with the side wall of the mounting ring groove;

[0012] The housing is provided with a temperature sensing element through hole which can communicate with the element installation area and the installation ring groove;

[0013] The temperature sensing element is connected via a temperature sensing element terminal, and the electrical connection end of the temperature sensing element terminal is placed in the element installation area.

[0014] Furthermore, one end of the temperature sensing element protective tube serves as an entry port, and the other end serves as a closed end.

[0015] Furthermore, the closed end of the temperature sensing element protective tube extends out of the port ring groove.

[0016] Furthermore, the centers of the temperature sensing element through hole, the mounting ring groove, and the temperature sensing element protective tube are coaxial.

[0017] Furthermore, the inner diameter of the temperature sensing element protection tube is not less than the inner diameter of the through hole of the temperature sensing element, and the inner diameter of the temperature sensing element protection tube is less than the inner diameter of the mounting ring groove.

[0018] Furthermore, after the annular seat sleeve and the temperature sensing element protection tube are sleeved, they are connected by welding.

[0019] Furthermore, the mounting ring groove includes a first mounting ring groove and a second mounting ring groove connected to each other. The first mounting ring groove is adjacent to the through hole of the temperature sensing element, and the second mounting ring groove is adjacent to the port ring groove.

[0020] The annular seat sleeve is in a T shape, including an annular sleeve, and a first annular flange and a second annular flange arranged on the outer wall of the annular sleeve. An annular extrusion groove is formed between the first annular flange and the second annular flange.

[0021] The outer wall of the first annular flange can slide in contact with the inner wall of the first mounting ring groove, and the outer wall of the second annular flange can slide in contact with the inner wall of the second mounting ring groove.

[0022] Furthermore, the bottom edge of the second annular flange is flush with the bottom edge of the second mounting ring groove.

[0023] Furthermore, the height of the annular sleeve is less than the depth of the first mounting ring groove.

[0024] Furthermore, an annular inclined edge is provided on the bottom side of the first annular flange, and the inclination angle of the annular inclined edge is 30° - 70°.

[0025] A temperature sensing mechanism for a sensor provided by the present invention realizes the assembly of the temperature sensing element protection tube assembly and the housing in a modular assembly manner, which can not only reduce the process difficulty and production cost, but also realize the crimping of temperature sensing element protection tube assemblies with different specifications and the housing, effectively ensuring that the temperature sensing element is not directly exposed to the medium to be measured, and thus can form a sealed protection for the temperature sensing element. In addition, due to the crimping form, the extruded material can be deformed to form a new annular support structure, further ensuring the stability of the connection between the temperature sensing element protection tube assembly and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the first perspective of a temperature sensing mechanism for a sensor according to the present invention;

[0027] Figure 2 is a schematic structural diagram of the second perspective of a temperature sensing mechanism for a sensor according to the present invention;

[0028] Figure 3It is a structural schematic diagram of a housing and a joint of a temperature sensing mechanism for a sensor according to the present invention;

[0029] Figure 4 It is a schematic diagram of a temperature sensing element protection tube assembly and a mounting ring groove in a temperature sensing mechanism for a sensor according to the present invention before assembly;

[0030] Figure 5 It is a schematic diagram of the assembled temperature sensing element protection tube assembly and the mounting ring groove in the temperature sensing mechanism for the sensor according to the present invention;

[0031] Figure 6 It is a structural schematic diagram of a temperature sensing element protective tube and an annular seat sleeve in a temperature sensing mechanism for a sensor according to the present invention;

[0032] Figure 7 It is a schematic structural diagram of a temperature sensing element connected with a temperature sensing element terminal and a temperature sensing element protective tube after being assembled in a temperature sensing mechanism for a sensor according to the present invention;

[0033] Figure 8 It is a cross-sectional view of a temperature sensing element connected with a temperature sensing element terminal and a temperature sensing element protective tube after being assembled in a temperature sensing mechanism for a sensor according to the present invention.

[0034] Graphic marking:

[0035] 1-housing, 101-through hole of temperature sensing element;

[0036] 2-connector, 201-port ring groove, 202-mounting ring groove, 203-first mounting ring groove, 204-second mounting ring groove, 205-annular support flange;

[0037] 3-temperature sensing element protection tube assembly, 301-temperature sensing element protection tube, 302-annular seat sleeve, 303-entry port, 304-closed end, 305-accommodating cavity, 306-annular sleeve, 307-first annular flange, 308-second annular flange, 309-annular extrusion groove, 310-annular inclined edge;

[0038] 4-Component installation area;

[0039] 5- medium area to be tested;

[0040] 6- Temperature sensing element;

[0041] 7- Temperature sensing element terminal. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1 to Figure 3 As shown, a temperature sensing mechanism for a sensor comprises a housing 1, one side of the housing 1 being used as a component installation area 4 for installing electronic components such as a printed circuit board; a connector 2 is provided on the other side of the housing 1, which in this embodiment can be a connector 2 protruding outward; the connector 2 faces a medium area 5 to be measured; a port ring groove 201 extending to the end is provided on the connector 2, and an installation ring groove 202 is provided along the bottom wall of the port ring groove 201, the installation ring groove 202 in this embodiment is in an inverted T shape, and a temperature sensing element protective tube assembly 3 is provided in the installation ring groove 202;

[0044] The temperature sensing element protection tube assembly 3 includes a temperature sensing element protection tube 301 capable of accommodating the temperature sensing element 6, and an annular seat sleeve 302 capable of being sleeved on the outer wall of the temperature sensing element protection tube 301 and capable of forming a crimping connection with the side wall of the mounting ring groove 202;

[0045] The housing 1 is provided with a temperature sensing element through hole 101 which can connect the element installation area 4 and the installation ring groove 202;

[0046] The temperature sensing element 6 enters the temperature sensing element protective tube 301 from the element installation area 4 through the temperature sensing element through hole 101. The temperature sensing element 6 is connected through the temperature sensing element terminal 7. The electrical connection end of the temperature sensing element terminal 7 is placed in the element installation area 4. Figure 7 and Figure 8 In this embodiment, the temperature sensing element 6 is preferably an NTC thermistor, which is a type of sensor resistor whose resistance value decreases as the temperature increases.

[0047] It should be noted that the shell 1 and the joint 2 in this embodiment are both made of aluminum alloy, such as 6061-T6 aluminum alloy; the shell 1 and the joint 2 in this embodiment are integrally formed, wherein the joint is used to connect to the device in the medium area to be measured, and a thread can be set on the outer wall or the inner wall of the port ring groove 201 for screwing.

[0048] The temperature sensing element protective tube 301 is made of stainless steel, such as 304, 316, 316L and other stainless steels; the annular seat sleeve 302 is made of stainless steel, preferably 304 stainless steel;

[0049] The annular seat sleeve 302 made of stainless steel and the temperature sensing element protective tube 301 made of stainless steel are placed on each other and then welded; after the welding is completed, the annular seat sleeve 302 is pushed into the mounting ring groove 202 by pressure. Since the annular seat sleeve 302 is made of stainless steel, such as 304, 316, 316L and other stainless steels, and the outer diameter of part of it is larger than the mounting ring groove 202 made of aluminum alloy, it will squeeze the side wall of the mounting ring groove 202, thereby causing the side wall of the mounting ring groove 202 to deform, thereby completing the purpose of squeezing and connecting the temperature sensing element protective tube assembly 3 and the mounting ring groove 202.

[0050] like Figure 4 As shown, in this embodiment, one end of the temperature sensing element protective tube 301 serves as an entry port 303 for allowing the temperature sensing element 6 to enter the temperature sensing element protective tube 301 from the entry port 303, and the other end serves as a closed end 304 for forming a semi-enclosed accommodating cavity 305, wherein the accommodating cavity 305 is used to accommodate the temperature sensing element 6 and prevent the temperature sensing element 6 from directly contacting the medium to be measured; the temperature sensing element 6 is adjacent to the closed end 304 and may be in contact with or not in contact with the inner wall of the accommodating cavity 305.

[0051] The closed end 304 of the temperature sensing element protective tube 301 extends out of the port ring groove 201 so as to fully contact the medium to be measured in the medium area to be measured, thereby facilitating the temperature sensing element 6 to be placed in the measured environment in the largest possible range. Under this structure, the temperature response is faster and the temperature resistance value is more accurate.

[0052] In order to facilitate the accurate assembly of the components in this embodiment and the accurate sensing of the temperature sensing element 6, the following optimizations are performed:

[0053] The centers of the temperature sensing element through hole 101 , the mounting ring groove 202 , and the temperature sensing element protective tube 301 are coaxial, so that it can be ensured that the temperature sensing element 6 can accurately enter the temperature sensing element protective tube 301 through the temperature sensing element through hole 101 .

[0054] The inner diameter of the temperature sensing element protective tube 301 is not less than the inner diameter of the temperature sensing element through hole 101 , and the inner diameter of the temperature sensing element protective tube 301 is smaller than the inner diameter of the mounting ring groove 202 .

[0055] As a connection form of the annular seat sleeve 302 and the temperature sensing element protective tube 301 in this embodiment, the annular seat sleeve 302 and the temperature sensing element protective tube 301 are sleeved and connected by welding to form a whole.

[0056] like Figure 5 and Figure 6As shown in the figure, the mounting ring groove 202 includes a first mounting ring groove 203 and a second mounting ring groove 204 which are connected to each other. The first mounting ring groove 203 is adjacent to the temperature sensing element through hole 101, and the second mounting ring groove 204 is adjacent to the port ring groove 201;

[0057] The annular seat sleeve 302 is in a "soil" shape, including an annular sleeve 306, and a first annular flange 307 and a second annular flange 308 arranged on the outer wall of the annular sleeve 306. An annular extrusion groove 309 is formed between the first annular flange 307 and the second annular flange 308. When the annular seat sleeve 302 is press-fitted with the mounting ring groove 202, the material deformed by the upper surface of the second annular flange 308 entering the first mounting ring groove 203 can form an annular support flange 205 matching the annular extrusion groove 309, which can better fix the temperature sensing element protection tube assembly 3;

[0058] As a further optimization of this solution, after the annular sleeve 306 and the temperature sensing element protection tube 301 are sleeved with each other, the top end of the annular sleeve 306 is horizontal with the inlet port of the temperature sensing element protection tube 301. This structure is more convenient to control the insertion depth of the temperature sensing element protection tube 301 relative to the mounting ring groove 202.

[0059] The outer wall of the first annular flange 307 can slide in contact with the inner wall of the first mounting ring groove 203, and the outer wall of the second annular flange 308 can slide in contact with the inner wall of the second mounting ring groove 204.

[0060] As an optimization of the annular seat sleeve 302 in this embodiment, the bottom edge of the second annular flange 308 is flush with the bottom edge of the second mounting ring groove 204; in addition, the height of the annular sleeve 306 is less than the depth of the first mounting ring groove 203. This structure can facilitate the longitudinal press-fitting of the second annular flange 308 and the first mounting ring groove 203.

[0061] In this embodiment, an annular inclined edge 310 is provided on the bottom side of the first annular flange 307, and the inclination angle of the annular inclined edge 310 is 30° - 70°. Under the action of this annular inclined edge 310, the material deformed by extrusion can completely fill the annular extrusion groove 309, further enhancing the connection stability.

[0062] The above is only to illustrate the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature sensing mechanism for a sensor, characterized in that: It includes a housing (1), one side of the housing (1) serves as a component installation area (4), and a connector (2) is provided on the other side of the housing (1); a port ring groove (201) that can extend to the end is formed on the connector (2), and an installation ring groove (202) is formed along the bottom wall of the port ring groove (201), and a temperature sensing element protection tube assembly (3) is arranged in the installation ring groove (202). The temperature sensing element protection tube assembly (3) includes a temperature sensing element protection tube (301) that can accommodate a temperature sensing element (6), and a ring seat sleeve (302) that can be sleeved on the outer wall of the temperature sensing element protection tube (301) and can form a press fit with the side wall of the installation ring groove (202). A temperature sensing element through hole (101) that can communicate the component installation area (4) and the installation ring groove (202) is formed on the housing (1). The temperature sensing element (6) is connected through a temperature sensing element terminal (7), and the electrical connection end of the temperature sensing element terminal (7) is placed in the component installation area (4). The installation ring groove (202) includes a first installation ring groove (203) and a second installation ring groove (204) that are connected to each other. The first installation ring groove (203) is adjacent to the temperature sensing element through hole (101), and the second installation ring groove (204) is adjacent to the port ring groove (201); the ring seat sleeve (302) is in a T shape, including a ring sleeve (306), and a first ring flange (307) and a second ring flange (308) arranged on the outer wall of the ring sleeve (306). A ring extrusion groove (309) is formed between the first ring flange (307) and the second ring flange (308); the outer wall of the first ring flange (307) can slide in contact with the inner wall of the first installation ring groove (203), and the outer wall of the second ring flange (308) can slide in contact with the inner wall of the second installation ring groove (204). The centers of the temperature sensing element through hole (101), the installation ring groove (202), and the temperature sensing element protection tube (301) are coaxial.

2. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: One end of the temperature sensing element protection tube (301) serves as an inlet port (303), and the other end serves as a closed end (304).

3. A temperature sensing mechanism for a sensor according to claim 2, characterized in that: The closed end (304) of the temperature sensing element protection tube (301) extends out of the port ring groove (201).

4. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: The inner diameter of the temperature sensing element protection tube (301) is not less than the inner diameter of the temperature sensing element through hole (101), and the inner diameter of the temperature sensing element protection tube (301) is less than the inner diameter of the installation ring groove (202).

5. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: After the ring seat sleeve (302) and the temperature sensing element protection tube (301) are sleeved, they are connected by welding.

6. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: The bottom edge of the second ring flange (308) is flush with the bottom edge of the second installation ring groove (204).

7. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: The height of the ring sleeve (306) is less than the depth of the first installation ring groove (203).

8. A temperature sensing mechanism for a sensor according to claim 1, characterized in that: A ring inclined edge (310) is arranged on the bottom side of the first ring flange (307), and the inclination angle of the ring inclined edge (310) is 30° - 70°.

Images