A pressure port mechanism for temperature and pressure sensor

Abstract

The present invention relates to the field of sensor technology, specifically a pressure port mechanism for a temperature and pressure sensor, comprising a shell, one side of the shell is provided with an electronic component installation groove, and a pressure sensing component embedding groove for installing a pressure sensing component is provided along the bottom wall of the electronic component installation groove; the other side of the shell is provided with a joint protruding outward; the joint is provided with a port ring groove that can extend to the end, and a pressure channel that can communicate with the pressure sensing component embedding groove is provided along the bottom wall of the port ring groove; the pressure sensing component includes a pressure port seat with a pressure port, and a pressure sensing element arranged on the top of the pressure port seat. This pressure port mechanism is not only simple in structure, easy to process, and low in cost, but also can more effectively improve production efficiency by using a modular assembly method.

Description

Technical Field

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

[0002] A sensor is a detection device that senses the information being measured and, according to a specific pattern, converts it into an electrical signal or other desired output form to meet requirements for information transmission, processing, storage, display, recording, and control. Types include pressure sensors and temperature sensors. A pressure sensor is a device or apparatus that senses pressure signals and, according to a specific pattern, converts them into a usable electrical output signal. It typically consists of a pressure-sensitive element and a signal processing unit and is widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, power generation, shipbuilding, machine tools, pipelines, and other industries. Its operating principle can be roughly divided into three steps: sensing pressure, converting signals, and outputting signals. Specifically, when pressure acts on a sensitive element, it deforms, and the degree of deformation is proportional to the pressure. After sensing the pressure change, the pressure sensor converts this change into an electrical signal. This conversion method may include measuring changes in resistance, capacitance, or inductance. Finally, the pressure sensor outputs the converted electrical signals to external equipment for processing. These signals can be analog signals or digital signals.

[0003] A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. It is the core component of a temperature measuring instrument. Its working principle is mainly based on the thermoelectric effect, resistance effect, thermistor effect, thermal resistance effect, thermocouple effect, infrared absorption effect, etc. of the material, converting the temperature signal into an electrical signal.

[0004] However, in some special cases, it is necessary to simultaneously measure the temperature and pressure of the liquid or gas in the test environment. If a temperature sensor and a pressure sensor are installed at the same time, they will be affected by the interface or space of the device to be tested, and simultaneous sensing will not be possible. In view of this, integrated temperature and pressure sensors that can sense both temperature and pressure have come into being.

[0005] A Chinese invention patent with publication number CN107817015A discloses an integrated pressure and temperature sensor, which forms a pressure sensing mechanism for measuring medium pressure by opening a proximal through hole and a fan-shaped second cavity that are interconnected at the sensor port, and arranging a pressure sensing element at the top of the proximal through hole.

[0006] In actual production, the proximal through hole and the fan-shaped second cavity provided by the above solution for pressure entry have strict processing requirements, and since 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 there are many types of elements used for pressure sensing, such as strain gauge, piezoresistive, capacitive and piezoelectric, if the above solution is adopted, it will result in different pressure through holes being required for pressure sensing elements of different specifications (mainly in the external space occupied and structure of the pressure sensing element). Since the top of the pressure sensing element is directly used to install the structure of the pressure sensing element, it is necessary to develop sensor ports with pressure through 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 problems of the above-mentioned prior art and provide a pressure port mechanism for a temperature and pressure sensor, which is used to solve the technical problems brought about by the traditional temperature and pressure sensor that the pressure channel for pressure passage is integrated with the shell, has high processing difficulty, high process requirements, high cost, and the specifications of the pressure channel cannot be changed, and cannot adapt to pressure sensing elements of different specifications.

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

[0010] A pressure port mechanism for a temperature and pressure sensor comprises a housing, one side of the housing being provided with an electronic component mounting groove, and a pressure sensing component embedding groove for mounting a pressure sensing component is provided along the bottom wall of the electronic component mounting groove; the other side of the housing being provided with an outwardly protruding joint; the joint being provided with a port ring groove that can extend to an end, and a pressure channel that can communicate with the pressure sensing component embedding groove is provided along the bottom wall of the port ring groove; the pressure sensing component comprising a pressure port seat with a pressure port, and a pressure sensing element arranged on the top of the pressure port seat.

[0011] Furthermore, an annular stop arm is provided on the outer wall of the pressure port seat; the lower surface of the annular stop arm can longitudinally limit the O-ring sleeved on the pressure port seat.

[0012] Furthermore, a support bracket capable of being snap-connected with the housing is provided in the electronic component installation groove, and the support bracket can longitudinally limit the pressure port seat.

[0013] Furthermore, the pressure sensing component groove includes a pressure port seat ring groove and a barrier arm ring groove that are interconnected, and the pressure port seat ring groove is connected to the pressure channel; the bottom side of the pressure port seat is inserted into the pressure port seat ring groove, the annular barrier arm is placed in the barrier arm ring groove, and the O-ring is located between the bottom wall of the barrier arm ring groove and the annular barrier arm.

[0014] Furthermore, the pressure port seat ring groove and the barrier arm ring groove are coaxial.

[0015] Furthermore, an annular chamfer is provided on the outer side wall corresponding to the bottom end of the pressure port seat.

[0016] Furthermore, the outer wall corresponding to the bottom end of the pressure port seat can be in sliding contact with the inner wall of the pressure port seat ring groove, and the annular blocking arm can be in sliding contact with the blocking arm ring groove.

[0017] Furthermore, the pressure channel is cylindrical and can be communicated with the pressure port.

[0018] Furthermore, the pressure channel and the center axis of the port ring groove are not colinear.

[0019] Furthermore, the shell and the connector are integrally formed and both are made of metal; the pressure port seat is made of stainless steel.

[0020] The present invention provides a pressure port mechanism for a temperature and pressure sensor, which uses a modular assembly method to realize the assembly of the pressure sensing component and the housing. The pressure channel opening on the housing can be opened at any position, and it only needs to be kept in communication with the pressure sensing component groove for plugging in the pressure sensing component. This not only reduces the difficulty of the process and reduces production costs, but also realizes portable plug-in assembly of pressure sensing components of different specifications and the housing. Since the pressure channel for pressure passage and the pressure sensing component for pressure sensing are two independent modules, it ensures that the housing can adapt to pressure sensing components of different specifications. This pressure port mechanism is not only simple in structure, easy to process, and low in cost, but also adopts a modular assembly method to more effectively improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of a pressure port mechanism for a temperature and pressure sensor according to the present invention;

[0022] Figure 2 A cross-sectional view of a housing in a pressure port mechanism for a temperature and pressure sensor according to the present invention;

[0023] Figure 3 This is a schematic structural diagram of a pressure sensing component in a pressure port mechanism for a temperature and pressure sensor according to the present invention;

[0024] Figure 4 A cross-sectional view of a pressure sensing component in a pressure port mechanism for a temperature and pressure sensor according to the present invention;

[0025] Figure 5 This is an exploded view of a pressure port mechanism for a temperature and pressure sensor according to the present invention.

[0026] Graphic mark:

[0027] 1-housing, 101-electronic component mounting groove, 102-pressure sensing component embedding groove, 103-pressure port seat ring groove, 104-blocking arm ring groove;

[0028] 2-connector, 201-port ring groove, 202-pressure channel;

[0029] 3-pressure sensing component, 301-pressure port seat, 302-pressure port, 303-pressure sensing element, 304-annular barrier arm, 305-annular chamfer;

[0030] 4-Support bracket;

[0031] 5-O-ring;

[0032] 6-Conditioning signal circuit board. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0034] like Figure 1 、 Figure 2 and Figure 5 As shown, a pressure port mechanism for a temperature and pressure sensor includes a housing 1, one side of the housing 1 being provided with an electronic component mounting groove 101 for mounting an electronic component, and a pressure sensing component embedding groove 102 for mounting a pressure sensing component 3 being defined along the bottom wall of the electronic component mounting groove 101; an outwardly protruding connector 2 being provided on the other side of the housing 1; the connector 2 being provided with a port ring groove 201 extending to an end thereof, and a pressure channel 202 being defined along the bottom wall of the port ring groove 201 and communicating with the pressure sensing component embedding groove 102;

[0035] The pressure sensing component 3 includes a pressure port seat 301 with a pressure port 302, and a pressure sensing element 303 arranged on the top of the pressure port seat 301; the pressure of the medium to be measured enters the pressure port 302 from the port ring groove 201 through the pressure channel 202, and the pressure sensing element 303 collects pressure data by sensing the deformation of the top of the pressure port seat 301 and transmits it to the conditioning signal circuit board 6 located in the electronic component mounting slot 101 for data processing.

[0036] In addition, it should be noted that the top of the pressure port seat 301 described in this embodiment adopts an ultra-thin film, which can sense pressure and produce deformation, and the pressure sensing element 303 is arranged on the surface of the ultra-thin film. 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 this field, the principle thereof will not be elaborated in detail.

[0037] The housing 1 and the connector 2 are integrally formed and are made of metal, such as aluminum, copper, carbon steel, stainless steel and other materials. In this embodiment, 6061-T6 aluminum alloy is preferred; the pressure port seat 301 is made of stainless steel, preferably 17-4PH stainless steel.

[0038] like Figure 3 and Figure 4 As shown, the outer wall of the pressure port seat 301 is provided with an annular barrier arm 304, and the upper surface of the annular barrier arm 304 can contact the bottom side of the support bracket 4 to achieve longitudinal limitation; the lower surface of the annular barrier arm 304 can longitudinally limit the O-ring 5 mounted on the pressure port seat 301; the O-ring 5 can further seal the pressure sensing component groove 102 to ensure that the pressure entering from the pressure channel 202 will not leak outward along the pressure sensing component groove 102, so that it can only enter the pressure port 302, thereby ensuring the accuracy of pressure collection.

[0039] like Figure 1 and Figure 5 As shown, in this embodiment, a support bracket 4 that can be snap-connected with the shell 1 is provided in the electronic component mounting groove 101, and the support bracket 4 can longitudinally limit the pressure port seat 301, that is, under the action of the support bracket 4, the bottom side of the support bracket 4 can longitudinally limit the upper surface of the annular blocking arm 304 by contacting, and can firmly limit the pressure port seat 301 in the pressure sensing component groove 102, preventing it from longitudinally moving under the pressure of the downward-opening pressure port 302 and then detaching from the pressure sensing component groove 102.

[0040] like Figure 2As shown, the pressure sensing component groove 102 includes a pressure port seat ring groove 103 and a barrier arm ring groove 104 that are interconnected, and the pressure port seat ring groove 103 is connected to the pressure channel 202; the bottom side of the pressure port seat 301 is inserted into the pressure port seat ring groove 103, and the annular barrier arm 304 is placed in the barrier arm ring groove 104, and the O-ring 5 is located between the bottom wall of the barrier arm ring groove 104 and the annular barrier arm 304.

[0041] The pressure port seat ring groove 103 and the barrier arm ring groove 104 are coaxial, so as to ensure that the pressure port seat 301 is accurately plugged and installed in place.

[0042] In addition, an annular chamfer 305 is provided on the outer side wall corresponding to the bottom end of the pressure port seat 301 to facilitate the entry of the O-ring 5 and to fit around the side wall of the pressure port seat 301 .

[0043] In this embodiment, the outer wall corresponding to the bottom end of the pressure port seat 301 can be in sliding contact with the inner wall of the pressure port seat ring groove 103, and the annular barrier arm 304 can be in sliding contact with the barrier arm ring groove 104; the pressure port seat 301 and the pressure sensing component embedded groove 102 can be connected by longitudinal movement to form a gap as small as possible, thereby reducing pressure leakage.

[0044] The pressure channel 202 is cylindrical and can be communicated with the pressure port 302 so that the pressure can enter the pressure port 302 through the pressure channel 202 without any obstacles.

[0045] It should be noted that, in this embodiment, the pressure port 302 is cylindrical and can accommodate air pressure of sufficiently high pressure; there are two options for the pressure channel 202 and the pressure port 302:

[0046] Solution 1: The center of the pressure channel 202 is coaxial with the center of the pressure port 302 , so that the pressure medium can enter the cavity of the pressure port 302 in a straight line;

[0047] Solution 2: The center of the pressure channel 202 is not coaxial with the center of the pressure port 302. In this way, part of the path will bend when the pressure medium enters the pressure port 302. However, this structure can meet the requirement of not occupying the space of the sensor housing and does not affect the accuracy of pressure sensing.

[0048] In this embodiment, the pressure channel 202 and the central axis of the port ring groove 201 are not collinear, that is, the center of the pressure channel 202 and the center of the port ring groove 201 are not collinear, and are eccentric to each other.

[0049] The above description is only for explaining the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure port mechanism for a temperature and pressure sensor, characterized in that: The invention comprises a shell (1), wherein one side of the shell (1) is provided with an electronic component installation groove (101), and a pressure sensing component embedding groove (102) for installing a pressure sensing component (3) is provided along the bottom wall of the electronic component installation groove (101); the other side of the shell (1) is provided with a joint (2) protruding outward; the joint (2) is provided with a port ring groove (201) that can extend to the end, and a pressure channel (202) that can communicate with the pressure sensing component embedding groove (102) is provided along the bottom wall of the port ring groove (201); The pressure sensing component (3) comprises a pressure port seat (301) having a pressure port (302), and a pressure sensing element (303) arranged on the top of the pressure port seat (301); The outer wall of the pressure port seat (301) is provided with an annular retaining arm (304); the lower surface of the annular retaining arm (304) can longitudinally limit the O-ring (5) sleeved on the pressure port seat (301); The pressure sensing component embedding groove (102) comprises a pressure port seat ring groove (103) and a barrier arm ring groove (104) which are connected to each other, and the pressure port seat ring groove (103) is in communication with the pressure channel (202); the bottom side of the pressure port seat (301) is inserted into the pressure port seat ring groove (103), the annular barrier arm (304) is placed in the barrier arm ring groove (104), and the O-ring (5) is located between the bottom wall of the barrier arm ring groove (104) and the annular barrier arm (304); The pressure port seat ring groove (103) and the barrier arm ring groove (104) are coaxial; An annular chamfer (305) is provided on the outer side wall corresponding to the bottom end of the pressure port seat (301); The outer wall corresponding to the bottom end of the pressure port seat (301) can be in sliding contact with the inner wall of the pressure port seat annular groove (103), and the annular retaining arm (304) can be in sliding contact with the retaining arm annular groove (104).

2. A pressure port mechanism for a temperature and pressure sensor according to claim 1, characterized in that: A support bracket (4) capable of being snap-connected with the housing (1) is arranged in the electronic component installation groove (101), and the support bracket (4) can limit the longitudinal position of the pressure port seat (301).

3. A pressure port mechanism for a temperature and pressure sensor according to claim 1, characterized in that: The pressure channel (202) is cylindrical and can be communicated with the pressure port (302).

4. A pressure port mechanism for a temperature and pressure sensor according to claim 1, characterized in that: The central axis of the pressure channel (202) and the port ring groove (201) are not colinear.

5. A pressure port mechanism for a temperature and pressure sensor according to claim 1, characterized in that: The housing (1) and the joint (2) are integrally formed and are both made of metal; the pressure port seat (301) is made of stainless steel.

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