A temperature and pressure sensing mechanism for a temperature and pressure sensor

Abstract

The present invention relates to the field of sensor technology, and specifically to a temperature and pressure sensing mechanism for a temperature and pressure sensor, comprising a shell, one side of the shell is provided with an electronic component installation groove, the bottom wall of the electronic component installation groove is provided with a pressure sensing component embedding groove for installing a pressure sensing component, and a temperature sensing component through hole for a temperature sensing component to pass through; the other side of the shell is provided with a joint, the joint is provided with a port ring groove that can extend to the end, and a pressure channel and a temperature sensing component installation ring groove are provided along the bottom wall of the port ring groove; the pressure sensing component embedding groove, the pressure channel and the port ring groove are interconnected; the temperature sensing component through hole, the temperature sensing component installation ring groove and the port ring groove are interconnected. The temperature and pressure sensing mechanism provided by this scheme is not only simple in structure, easy to process, and low in cost, but also can more effectively improve production efficiency by adopting a modular assembly method.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensor testing, and in particular to a temperature and pressure sensing mechanism for a temperature and pressure 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. 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 to convert the temperature signal into an electrical signal.

[0003] 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.

[0004] 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.

[0005] In actual production, the proximal through hole and the fan-shaped second cavity for pressure entry provided by the above scheme have strict processing requirements, and because it adopts the direct hole opening on the sensor port, the complexity of the process is further increased. The structure provided for accommodating the temperature sensing element has strict processing requirements for the depth and diameter of the tubular hole, and because it adopts the direct hole opening on the sensor port, the complexity of the process is further increased, thereby reducing production efficiency. In addition, since the elements used for temperature or pressure sensing have multiple specifications, if the above scheme is adopted, it will lead to the need to open different tubular holes for pressure sensing elements and temperature sensing elements of different specifications (mainly in the external occupied space of the pressure sensing element and the temperature sensing element), and then it is necessary to develop sensor ports with tubular holes of different specifications, further increasing production costs.

[0006] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned problems of the prior art and provide a temperature and pressure sensing mechanism for a temperature and pressure sensor, which is used to solve the technical problems that the traditional temperature and pressure sensor has great processing difficulty and high process requirements due to the integral molding of the cavity used to accommodate the pressure sensing element and the temperature sensing element with the shell, and cannot adapt to pressure sensing elements and temperature sensing elements of different specifications because the specifications of the cavity cannot be changed.

[0008] The above objectives are achieved through the following technical solutions:

[0009] A temperature and pressure sensing mechanism for a temperature and pressure sensor, comprising a housing, one side of the housing is provided with an electronic component installation groove, the bottom wall of the electronic component installation groove is provided with a pressure sensing component embedding groove for installing a pressure sensing component, and a temperature sensing component through hole for the temperature sensing component to penetrate;

[0010] A joint is provided on the other side of the shell, and a port ring groove that can extend to the end is provided on the joint, and a pressure channel and a temperature sensing component mounting ring groove are provided along the bottom wall of the port ring groove; the pressure sensing component embedding groove, the pressure channel and the port ring groove are connected to each other; the temperature sensing component through hole, the temperature sensing component mounting ring groove and the port ring groove are connected to each other.

[0011] Furthermore, the pressure sensing assembly includes a pressure port seat with a pressure port, and a pressure sensing element arranged on the top of the pressure port seat.

[0012] Furthermore, the pressure port seat includes an annular stop arm arranged on the outer wall, and the lower surface of the annular stop arm can longitudinally limit the O-ring sleeved on the pressure port seat.

[0013] Further, a support bracket is arranged in the electronic component mounting groove, and the support bracket can longitudinally limit the annular retaining arm.

[0014] Further, the pressure induction component embedding groove includes a pressure port seat ring groove and a retaining arm ring groove which are connected to each other, and the pressure port seat ring groove is communicated with the pressure channel; the bottom side of the pressure port seat is inserted into the pressure port seat ring groove, and the annular retaining arm is placed in the retaining arm ring groove.

[0015] Further, the temperature induction component includes a temperature sensing element protection tube capable of accommodating a temperature sensing element, and an annular seat sleeve sleeved on the outer wall of the temperature sensing element protection tube and capable of forming a press connection with the side wall of the temperature induction component mounting ring groove; the temperature sensing element enters the temperature sensing element protection tube from the electronic component mounting groove through the temperature induction component through hole, and the temperature sensing element is connected through a temperature sensing element terminal.

[0016] Further, one end of the temperature sensing element protection tube serves as an inlet port, and the other end serves as a closed end, forming a semi-closed accommodation cavity for accommodating the temperature sensing element; the closed end extends out of the port ring groove.

[0017] Further, the temperature induction component mounting ring groove includes a first mounting ring groove and a second mounting ring groove which are connected to each other, the annular seat sleeve is in a cross shape, including an annular sleeve, and a first annular flange and a second annular flange arranged on the outer wall of the annular sleeve, and an annular extrusion groove is formed between the first annular flange and the second annular flange.

[0018] Further, the height of the annular sleeve is less than the depth of the first mounting ring groove.

[0019] Further, an annular inclined edge is arranged on the bottom side of the first annular flange, and the inclination angle of the annular inclined edge is 30° - 70°.

[0020] A temperature and pressure induction mechanism for a temperature and pressure sensor provided by the present invention realizes the assembly of a pressure induction component and a temperature induction component with a housing in a modular assembly manner, which can not only reduce the process difficulty and production cost, but also realize the stable connection of different specifications of pressure induction components and temperature induction components with the housing. In addition, since the temperature induction component and the housing adopt a press connection form, the extruded material can be deformed to form a new annular support structure, further ensuring the stability of the connection between the temperature induction component and the housing. The temperature and pressure induction mechanism provided by this solution is not only simple in structure, easy to process and low in cost, but also can improve the production efficiency more efficiently by adopting a modular assembly method. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention from a first viewing angle;

[0022] Figure 2 A schematic diagram of the structure of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention from a second viewing angle;

[0023] Figure 3 A schematic diagram of the structure of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention from a third viewing angle;

[0024] Figure 4 An exploded diagram of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention;

[0025] Figure 5 A cross-sectional view of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention;

[0026] Figure 6 It is a front sectional view of the assembly of a temperature and pressure sensing mechanism for a temperature and pressure sensor according to the present invention;

[0027] Figure 7 It is a schematic diagram of the annular seat sleeve and the temperature sensing component installation ring groove after crimping in the temperature and pressure sensing mechanism for the temperature and pressure sensor described in the present invention.

[0028] Graphic marking:

[0029] 1-housing, 101-electronic component mounting groove, 102-pressure sensing component embedding groove, 103-temperature sensing component through hole, 104-connector, 105-port ring groove, 106-pressure channel, 107-temperature sensing component mounting ring groove, 108-pressure port seat ring groove, 109-blocking arm ring groove, 110-first mounting ring groove, 111-second mounting ring groove;

[0030] 2-pressure sensing component, 201-pressure port, 202-pressure port seat, 203-pressure sensing element, 204-annular baffle arm, 205-annular chamfer;

[0031] 3-temperature sensing assembly, 301-temperature sensing element, 302-temperature sensing element protective tube, 303-entry port, 304-closed end, 305-accommodating cavity, 306-annular seat sleeve, 307-annular sleeve, 308-first annular flange, 309-second annular flange, 310-annular extrusion groove, 311-annular inclined edge, 312-temperature sensing element terminal, 313-annular support flange;

[0032] 4-Printed circuit board;

[0033] 5-O-ring;

[0034] 6-Support bracket. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figure 1 to Figure 6 As shown, a temperature and pressure sensing mechanism for a temperature and pressure sensor comprises a housing 1, one side of the housing 1 is provided with an electronic component installation groove 101, the bottom wall of the electronic component installation groove 101 is provided with a pressure sensing component embedding groove 102 for installing a pressure sensing component 2, and a temperature sensing component through hole 103 for a temperature sensing component 3 to penetrate;

[0037] A joint 104 is provided on the other side of the shell. In this embodiment, the joint 104 protrudes outward. A port ring groove 105 extending to the end is provided on the joint 104. A pressure channel 106 and a temperature sensing component mounting ring groove 107 are provided along the bottom wall of the port ring groove 105. In this embodiment, the temperature sensing component mounting ring groove 107 is in an inverted T shape; the pressure sensing component embedding groove 102, the pressure channel 106 and the port ring groove 105 are interconnected; the temperature sensing component through hole 103, the temperature sensing component mounting ring groove 107 and the port ring groove 105 are interconnected;

[0038] It should be noted that the shell 1 and the connector 104 in this embodiment are both made of aluminum alloy, such as 6061-T6 aluminum alloy; the shell 1 and the connector 104 in this embodiment are integrally formed, wherein the connector 104 is used to connect to a device containing the medium to be tested, and a thread can be set on the outer wall or the inner wall of the port ring groove 105 for screwing.

[0039] like Figures 4 to 6 As shown, the pressure sensing component 2 in this embodiment includes a pressure port seat 202 with a pressure port 201, and a pressure sensing element 203 arranged on the top of the pressure port seat 202; the pressure of the medium to be measured enters the pressure port 201 from the port ring groove 105 through the pressure channel 106, and the pressure sensing element 203 collects pressure data by sensing the deformation of the top of the pressure port seat 202 and transmits it to the printed circuit board 4 located in the electronic component mounting groove 101 for data processing.

[0040] In addition, it should be noted that the pressure port seat 202 in this embodiment is made of stainless steel, preferably 17-4PH stainless steel.

[0041] The top of the pressure port seat 202 is made of an ultra-thin film, which can sense pressure and produce deformation, and the pressure sensing element 203 is arranged on the surface of the ultra-thin film. In this embodiment, a strain gauge can be used to sense the resistance change caused by the deformation of the diaphragm to realize signal collection. Since the method and processing method of collecting signals are common knowledge in the field, the principle will not be elaborated on in detail.

[0042] The pressure port seat 202 in this embodiment is cross-shaped, and includes an annular barrier arm 204 arranged on the outer wall. The lower surface of the annular barrier arm 204 can longitudinally limit the O-ring 5 sleeved on the pressure port seat 202; the O-ring 5 can seal the gap between the inner wall of the pressure sensing component groove 102 and the outer wall of the pressure port seat 202, ensuring that the medium pressure entering from the pressure channel 106 will not leak along the gap to the side of the electronic component mounting groove 101, so that it can only enter the pressure port 201, thereby ensuring the accuracy of medium pressure collection.

[0043] In addition, a support bracket 6 is also provided in the electronic component installation groove 101, and the support bracket 6 can longitudinally limit the annular barrier arm 204, that is, under the action of the support bracket 6, the bottom side of the support bracket 6 can contact with the upper surface of the annular barrier arm 204 for longitudinal limitation, especially when the medium pressure enters the pressure port 201, the pressure port seat 202 can be firmly limited in the pressure sensing component groove 102 to prevent it from longitudinally moving due to the pressure of the downwardly opening pressure port 201 under the pressure, and then detaching from the pressure sensing component groove 102.

[0044] like Figure 5 and Figure 6 As shown, the pressure sensing component embedding groove 102 in this embodiment includes a pressure port seat ring groove 108 and a barrier arm ring groove 109 which are interconnected, and the pressure port seat ring groove 108 is connected to the pressure channel 106; the bottom side of the pressure port seat 202 is inserted into the pressure port seat ring groove 108, the annular barrier arm 204 is placed in the barrier arm ring groove 109, and the O-ring 5 is located between the bottom wall of the barrier arm ring groove 109 and the annular barrier arm 204.

[0045] As an optimization of this embodiment, an annular chamfer 205 is opened on the outer side wall corresponding to the bottom end of the pressure port seat 202, so that the O-ring 5 can quickly enter along the bottom end of the pressure port seat 202 and be mounted on the side wall of the pressure port seat 202.

[0046] like Figures 4 to 6As shown, the temperature sensing component 3 in this embodiment includes a temperature sensing element protective tube 302 capable of accommodating a temperature sensing element 301, and an annular seat sleeve 306 that can be sleeved on the outer wall of the temperature sensing element protective tube 302 and can form a crimping connection with the side wall of the temperature sensing component mounting ring groove 107; the temperature sensing element 301 enters the temperature sensing element protective tube 302 from the electronic component mounting groove 101 through the temperature sensing component through hole 103, and the temperature sensing element 301 is connected through a temperature sensing element terminal 312, and the electrical connection end of the temperature sensing element terminal 312 is placed in the electronic component mounting groove 101 and connected to the printed circuit board 4; the temperature sensing element 301 in this embodiment is preferably an NTC thermistor, which is a type of sensor resistor whose resistance value decreases as the temperature increases.

[0047] The temperature sensing element protective tube 302 in this embodiment is made of stainless steel, such as 304, 316, 316L or other stainless steel;

[0048] The annular seat sleeve 306 is made of stainless steel, preferably 304 stainless steel;

[0049] The connection method is: after the annular seat sleeve 306 made of stainless steel and the temperature sensing element protective tube 302 made of stainless steel are mutually sleeved, they are connected by welding; after the welding is completed, the annular seat sleeve 306 is pushed into the temperature sensing component mounting ring groove 107 by pressure. Since the annular seat sleeve 306 is made of stainless steel and its outer diameter is larger than the temperature sensing component mounting ring groove 107 made of aluminum alloy, it will squeeze the side wall of the temperature sensing component mounting ring groove 107, thereby causing the side wall of the temperature sensing component mounting ring groove 107 to deform, thereby completing the purpose of extrusion connection between the temperature sensing component 3 and the temperature sensing component mounting ring groove 107.

[0050] like Figure 4 and Figure 6 As shown, one end of the temperature sensing element protective tube 302 is used as an inlet port 303, and the other end is used as a closed end 304, forming a semi-enclosed accommodating chamber 305 for accommodating the temperature sensing element 301; the accommodating chamber 305 can protect the temperature sensing element 301 and effectively prevent the temperature sensing element 301 from directly contacting the medium to be measured; after actual installation, the position of the temperature sensing element 301 is adjacent to the closed end 304, and can be in contact or non-contact with the inner wall of the accommodating chamber 305. The closed end 304 extends out of the port ring groove 105 so as to fully contact the medium to be measured in the medium area to be measured, thereby facilitating the temperature sensing element 301 to be placed in the environment to be measured in the largest possible range. Under this structure, the temperature response is faster and the temperature resistance value is more accurate.

[0051] like Figure 6 and Figure 7As shown, the temperature sensing component mounting ring groove 107 includes a first mounting ring groove 110 and a second mounting ring groove 111 that are connected to each other. The first mounting ring groove 110 is adjacent to the temperature sensing component through hole 103, and the second mounting ring groove 111 is adjacent to the port ring groove 105. The annular seat sleeve 306 is in a T shape, including an annular sleeve 307, and a first annular flange 308 and a second annular flange 309 provided on the outer wall of the annular sleeve 307. An annular extrusion groove 310 is formed between the first annular flange 308 and the second annular flange 309, which is used for the entry of the deformed material of the first mounting ring groove 110 extruded by the upper surface of the second annular flange 309 when the annular seat sleeve 306 is crimped with the temperature sensing component mounting ring groove 107, so as to form an annular support flange 313 matching the annular extrusion groove 310. Through the mutual clamping of the annular support flange 313 and the annular extrusion groove 310, the temperature sensing component 3 can be more stably fixed.

[0052] As a further optimization of this solution, after the annular sleeve 307 and the temperature sensing element protection tube 302 are sleeved with each other, the top end of the annular sleeve 307 is level with the entry port 303 of the temperature sensing element protection tube 302. This structure is more conducive to controlling the entry depth of the temperature sensing element protection tube 302 relative to the temperature sensing component mounting ring groove 107.

[0053] As the installation method of the annular sleeve 307 and the temperature sensing component mounting ring groove 107 in this embodiment, the outer wall of the first annular flange 308 can slide in contact with the inner wall of the first mounting ring groove 110, and the outer wall of the second annular flange 310 can slide in contact with the inner wall of the second mounting ring groove 111.

[0054] When the crimping of the annular sleeve 307 and the temperature sensing component mounting ring groove 107 is completed, the bottom edge of the second annular flange 309 is flush with the bottom edge of the second mounting ring groove 111.

[0055] In this embodiment, the height of the annular sleeve 307 is less than the depth of the first mounting ring groove 110. This structure facilitates the longitudinal crimping of the second annular flange 309 and the first mounting ring groove 110.

[0056] As an optimization of this solution, an annular inclined edge 311 is provided on the bottom side of the first annular flange 308, and the inclination angle of the annular inclined edge 311 is 30° - 70°. Under the action of this annular inclined edge 311, it can promote the completely filling of the annular extrusion groove 310 by the extruded and deformed material, and further minimize the gap between the annular support flange 313 and the annular extrusion groove 310.

[0057] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature and pressure sensing mechanism for a temperature and pressure sensor, characterized in that: It includes a housing (1). On one side of the housing (1), there is an electronic component installation groove (101). On the bottom wall of the electronic component installation groove (101), there is a pressure sensing component embedding groove (102) for installing a pressure sensing component (2), and a temperature sensing component through hole (103) through which the temperature sensing component (3) passes through. On the other side of the housing, there is a connector (104). On the connector (104), there is a port ring groove (105) that can extend to the end. Along the bottom wall of the port ring groove (105), there is a pressure channel (106) and a temperature sensing component installation ring groove (107). The pressure sensing component embedding groove (102), the pressure channel (106) and the port ring groove (105) are interconnected. The temperature sensing component through hole (103), the temperature sensing component installation ring groove (107) and the port ring groove (105) are interconnected. The temperature sensing component (3) includes a temperature sensing element protection tube (302) that can accommodate a temperature sensing element (301), and an annular seat sleeve (306) that can be sleeved on the outer wall of the temperature sensing element protection tube (302) and can form a press fit with the side wall of the temperature sensing component installation ring groove (107). The temperature sensing element (301) enters the temperature sensing element protection tube (302) from the electronic component installation groove (101) through the temperature sensing component through hole (103). The temperature sensing element (301) is connected through a temperature sensing element terminal (312). The temperature sensing component installation ring groove (107) includes a first installation ring groove (110) and a second installation ring groove (111) that are connected to each other. The annular seat sleeve (306) is in a T shape and includes an annular sleeve (307), and a first annular flange (308) and a second annular flange (309) provided on the outer wall of the annular sleeve (307). An annular extrusion groove (310) is formed between the first annular flange (308) and the second annular flange (309). The connector (104) is made of aluminum alloy material, and the annular seat sleeve (306) and the temperature sensing element protection tube (302) are both made of stainless steel material. The annular seat sleeve (306) made of stainless steel and the temperature sensing element protective tube (302) made of stainless steel are sleeved together and connected by welding. After the welding is completed, the annular seat sleeve (306) is pushed into the temperature sensing component mounting annular groove (107) by pressure. Since the annular seat sleeve (306) is made of stainless steel and has an outer diameter larger than the temperature sensing component mounting annular groove (107) made of aluminum alloy, it squeezes the side wall of the temperature sensing component mounting annular groove (107), thereby causing the side wall of the temperature sensing component mounting annular groove (107) to deform, thereby completing the temperature sensing component mounting annular groove (107). The purpose of the temperature sensing component (3) is to be extruded and connected with the temperature sensing component mounting annular groove (107); specifically, when the annular seat sleeve (306) is crimped with the temperature sensing component mounting annular groove (107), the material of the first mounting annular groove (110) that is deformed and squeezed by the upper surface of the second annular flange (309) enters, thereby forming an annular support flange (313) that matches the annular extrusion groove (310). Through the mutual clamping of the annular support flange (313) and the annular extrusion groove (310), the temperature sensing component (3) can be better stably fixed.

2. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 1, characterized in that: The pressure sensing component (2) comprises a pressure port seat (202) having a pressure port (201), and a pressure sensing element (203) arranged on the top of the pressure port seat (202).

3. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 2, characterized in that: The pressure port seat (202) comprises an annular retaining arm (204) arranged on the outer wall, and the lower surface of the annular retaining arm (204) can longitudinally limit the O-ring (5) sleeved on the pressure port seat (202).

4. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 3, characterized in that: A support bracket (6) is arranged in the electronic component installation groove (101), and the support bracket (6) can limit the longitudinal position of the annular blocking arm (204).

5. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 3 or 4, characterized in that: The pressure sensing component embedding groove (102) includes a pressure port seat ring groove (108) and a baffle arm ring groove (109) which are connected to each other, and the pressure port seat ring groove (108) is connected to the pressure channel (106); the bottom side of the pressure port seat (202) is inserted into the pressure port seat ring groove (108), and the annular baffle arm (204) is placed in the baffle arm ring groove (109).

6. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 1, characterized in that: One end of the temperature sensing element protective tube (302) serves as an inlet port (303), and the other end serves as a closed end (304), forming a semi-enclosed accommodating cavity (305) for accommodating the temperature sensing element (301).

7. A temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 1, characterized in that: The height of the annular sleeve (307) is smaller than the depth of the first mounting annular groove (110).

8. The temperature and pressure sensing mechanism for a temperature and pressure sensor according to claim 1, characterized in that: An annular inclined edge (311) is provided on the bottom side of the first annular flange (308), and the inclination angle of the annular inclined edge (311) is 30° to 70°.

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