Temperature and pressure sensor with valve ejector rod

Abstract

A temperature pressure sensor with a valve push rod comprises: a housing comprising a pressure interface, the pressure interface comprising a plate and an interface tube formed by extending the plate; the interior of the interface pipe is communicated to the surface of one side of the longitudinal far end of the plate through a pressure hole and a mounting hole; an electronic module assembly fixed inside the housing; the pressure sensitive element is fixed in the pressure hole in an airtight manner and is electrically connected to the electronic module assembly; the mounting seat protrudes towards the longitudinal near end to form a valve ejector rod; the temperature sensitive assembly comprises a temperature sensitive element and a plurality of terminals, and the terminals penetrate through the mounting base in a sealed mode and then are electrically connected to the electronic module assembly; according to the invention, the valve push rod, the pressure sensitive element and the temperature sensitive element are highly integrated in the compact shell, so that the pressure and the temperature of the to-be-measured fluid can be synchronously measured while the valve of the mounting interface is automatically pushed open when the sensor is mounted.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, specifically a temperature and pressure sensor with a valve rod. Background Technology

[0002] Pressure sensors are typically connected to a port on a container or pipe containing the fluid being measured to measure its pressure. For example, in measuring refrigeration lines, pressure sensors are commonly used to measure the pressure of the refrigerant. Before the pressure sensor is installed, the container usually needs to be sealed to prevent leakage. Therefore, the pressure sensor can be mounted on a valve. However, this method requires specialized valve control to keep the valve closed before the pressure sensor is installed and open it after installation.

[0003] In addition, some pressure sensors require the additional temperature of the measured medium to be obtained via a thermistor. To reduce errors and thermal hysteresis caused by temperature gradients, the thermistor typically needs to be placed as close as possible to the pressure inlet port. Furthermore, an electrical connection is required between the thermistor and the circuit board inside the pressure sensor, making the sealing of the thermistor crucial. Existing technologies typically employ the following methods: 1. Encasing the thermistor in a metal temperature sleeve and placing it as close as possible to the pressure port, filling the metal temperature sleeve with thermally conductive material to reduce the influence of temperature gradients. This method increases cost and sensor size, and also presents issues with the reliable filling and aging of the thermally conductive material. 2. Exposing the thermistor directly inside the pressure channel and then sealing it around the terminals of the thermistor with sealant. This method also faces the problem of sealant aging, and as the medium pressure increases, the sealing performance and lifespan of the sealant decrease sharply or even fail completely; additionally, the head of the thermistor needs to be reliably fixed to prevent vibration.

[0004] The information disclosed in the background section of this invention is only intended to enhance the understanding of the general background of this invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a temperature and pressure sensor with a valve push rod to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A temperature and pressure sensor with a valve push rod, comprising: The housing includes a metal pressure port, the pressure port comprising a laterally extending plate and an interface tube integrally formed from the plate toward a longitudinal proximal end for introducing a medium to be measured; the interior of the interface tube is connected to the longitudinal distal end surface of the plate through a pressure hole and a mounting hole. Electronic module assembly fixed inside the housing; A pressure-sensitive element is hermetically fixed to the longitudinal distal end of the pressure orifice and electrically connected to the electronic module assembly; A mounting seat is sealed within the mounting hole, which protrudes longitudinally towards its proximal end to form a valve push rod; The temperature-sensitive component includes a temperature-sensitive element disposed within the interface tube and a plurality of terminals connected at one end to the temperature-sensitive element, wherein the other end of the terminals is sealed through the mounting base toward the longitudinal distal end and electrically connected to the electronic module assembly.

[0007] Preferably, the mounting base has a through terminal hole along the longitudinal direction, and the terminal passes through the terminal hole and is electrically connected to the electronic module assembly.

[0008] Preferably, a seal is formed between the terminal and the terminal via by sintered glass.

[0009] Preferably, the mounting base includes a longitudinally extending cylindrical portion and a plate portion enclosed at the longitudinal distal end of the cylindrical portion, the longitudinal proximal end of the cylindrical portion being sealed and welded to the longitudinal distal end of the mounting hole; the valve top rod is formed by protruding from the plate portion toward the longitudinal proximal end, and the terminal through hole is disposed on the plate portion.

[0010] Preferably, the mounting hole has a first support surface facing the longitudinal distal end, and the outer wall of the cylindrical portion abuts against the first support surface facing the longitudinal distal end.

[0011] Preferably, the longitudinal proximal end of the cylindrical portion and the longitudinal distal end of the mounting hole are circumferentially sealed together by a weld seam.

[0012] Preferably, the valve top rod is coaxially arranged with the interface pipe.

[0013] Preferably, the longitudinal proximal end of the sintered glass is relatively enlarged to form an enlarged portion.

[0014] Preferably, the longitudinal distal surface of the plate is flush with the longitudinal distal surface of the mounting base.

[0015] Preferably, the pressure-sensitive element is a metal pressure-sensitive head.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates the valve stem, pressure-sensitive element, and temperature-sensitive element into a compact housing, enabling simultaneous measurement of the pressure and temperature of the fluid under test while the valve at the installation interface is automatically opened during sensor installation.

[0017] 2. The temperature-sensitive element is directly installed inside the interface pipe used to introduce the fluid to be measured, allowing it to fully and directly contact the fluid and ensuring rapid response and high accuracy in temperature measurement. Simultaneously, using the mounting base as the base for the valve stem and the sealed feedthrough structure for the temperature-sensitive component terminals achieves structural reuse and space optimization for both valve stem and temperature detection functions. This ensures the overall miniaturization and high rigidity of the sensor. Furthermore, the mounting base is welded and sealed to the pressure interface, allowing the valve stem and temperature-sensitive component to be pre-installed on the mounting base, which improves the sensor assembly speed.

[0018] 3. A seal is formed between the terminals and the terminal vias by sintered glass, which can maintain the sealing between the terminals and the terminal vias for a relatively long time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the temperature and pressure sensor structure with a valve rod in this embodiment; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; In the figure: 1. Housing; 11. Pressure port; 111. Plate; 112. Interface tube; 113. Pressure hole; 114. Mounting hole; 114a. First support surface; 12. Cylinder shell; 13. End button; 131. Pin; 14. Mounting cavity; 2. Electronic module assembly; 3. Pressure sensitive element; 4. Mounting base; 41. Cylinder section; 42. Plate section; 43. Valve top rod; 44. Terminal through hole; 5. Temperature sensitive component; 51. Temperature sensitive element; 52. Terminal; 6. Sintered glass; 61. Enlargement section; 7. Weld. Detailed Implementation

[0020] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. The following embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the following description, the same reference numerals are used to denote the same or equivalent elements, and repeated descriptions are omitted.

[0021] In the description of this application, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the prepositions "first," "second," and "third," etc., are only used for the purpose of distinguishing the modified objects, and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] It should also be further understood that the term "and / or" as used in this application specification and the corresponding claims refers to any combination of one or more of the listed items and all possible combinations.

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides a temperature and pressure sensor with a valve push rod. This sensor is typically connected to an installation port on a container or pipeline containing the fluid to be measured to measure the pressure of the fluid. Its core function is that during installation into the pipeline or container's installation port, its own valve push rod 43 automatically opens a pre-installed valve in the installation port, allowing the fluid to flow into the sensor, and then being measured by the integrated pressure-sensitive element 3 and temperature-sensitive element 51.

[0025] This embodiment provides a temperature and pressure sensor with a valve rod 43, which includes a housing 1, an electronic module assembly 2, a pressure-sensitive element 3, a mounting base 4, and a temperature-sensitive component 5.

[0026] The housing 1 includes a metal pressure port 11. The pressure port 11 can be integrally formed from a metal material with good mechanical strength and corrosion resistance, such as stainless steel or alloy steel, through machining or precision casting. The pressure port 11 includes a laterally extending plate 111 and a longitudinal proximal end (i.e., Figure 1The plate 111 extends integrally to form a hollow interface tube 112, which is used to introduce the medium to be measured. The plate 111 is typically circular. The outer wall of the interface tube 112 may have standard external threads for connection to a mounting interface on a container or pipe containing the fluid to be measured. The internal cavity of the interface tube 112 constitutes the main channel for the inflow of the medium (which can be a fluid or a gas).

[0027] On plate 111, two longitudinal sections are opened (i.e. Figure 1 The plate 111 has two through holes (vertically) extending from its longitudinal direction: a pressure hole 113 and a mounting hole 114. Both the pressure hole 113 and the mounting hole 114 originate from the longitudinal distal surface of the plate 111 (i.e.,...). Figure 1 The upper surface of the middle plate 111 extends into the internal cavity of the interface tube 112. The pressure hole 113 is used to lead the medium to be measured to the pressure sensitive element 3. The mounting hole 114 is used to receive and fix the mounting base 4. The pressure hole 113 and the mounting hole 114 can be arranged adjacent to each other.

[0028] In this embodiment, the housing 1 may further include a cylindrical shell 12 and an end button 13. The pressure port 11 is fixedly connected to the bottom end of the cylindrical shell 12, and the connection method may be welding. The end button 13 is located at the top end of the cylindrical shell 12. The top end of the cylindrical shell 12 can be rolled inward to press the bottom end of the end button 13 against the pressure port 11. A pin 131 may be provided on the end button 13 to realize the electrical connection between the electronic module assembly 2 and external devices.

[0029] In this embodiment, the housing 1 may have a mounting cavity 14 inside, which may be formed by the pressure port 11, the cylindrical shell 12, and the end button 13. The upper surface of the plate 111 of the pressure port 11 is the bottom surface of the mounting cavity 14. Therefore, the interior of the interface tube 112 is also connected to the mounting cavity 14 through the pressure hole 113 and the mounting hole 114.

[0030] The electronic module assembly 2 is fixed inside the mounting cavity 14 within the housing 1. It is used to process electrical signals from the pressure-sensitive element 3 and the temperature-sensitive element 5. The electronic module assembly 2 may include a circuit board 111. Processing circuitry may be disposed on the circuit board 111 for processing the electrical signals.

[0031] The pressure-sensitive element 3 is hermetically fixed to the distal longitudinal end of the pressure port 113 (i.e., Figure 1 The pressure sensing element 3 is located at the top of the pressure orifice 113, through which the pressure of the medium to be measured is received. The pressure sensing element 3 is electrically connected to the electronic module assembly 2 to transmit the electrical signal generated by the pressure sensing element 3 to the electronic module assembly 2.

[0032] Preferably, the pressure-sensitive element 3 is a metal pressure-sensitive head. That is, the pressure-sensitive element 3 can be a pressure-sensitive head having an elastic metal diaphragm and a strain resistor disposed on the surface of the elastic metal diaphragm. The electrical signal output terminal of the metal pressure-sensitive head is electrically connected to the circuit board 111 of the electronic module assembly 2 via leads or the like.

[0033] Preferably, the mounting base 4 includes a longitudinal ( Figure 1 The cylindrical portion 41 extending in the vertical direction and the plate 111 portion enclosed at the longitudinal distal end of the cylindrical portion 41 (e.g., in the vertical direction) Figure 1 As shown, the longitudinal distal end of the cylinder 41 refers to the bottom end of the cylinder 41. The outer diameter of the cylinder 41 is adapted to the inner diameter of the mounting hole 114. The valve push rod 43 extends from the plate 111 towards the longitudinal proximal end ( Figure 1 The valve stem 43 protrudes from the lower part of the valve (inside the center), and the mounting base 4 can be integrally machined. In this embodiment, the valve stem 43 and the interface pipe 112 can be coaxially arranged.

[0034] Preferably, the longitudinal proximal end of the cylindrical portion 41 ( Figure 1 The top end of the middle cylinder 41 is sealed and welded to the longitudinal distal end of the mounting hole 114. Figure 1 Top of mounting hole 114.

[0035] In a preferred embodiment, the longitudinal proximal end of the cylindrical portion 41 and the longitudinal distal end of the mounting hole 114 can be circumferentially and sealed together by a weld seam 7. The weld seam 7 can be formed by precision welding processes such as laser welding, plasma welding, or electron beam welding to create a robust and well-sealed connection.

[0036] Preferably, the mounting hole 114 has a side facing the longitudinal distal end (e.g., Figure 1 The first support surface 114a (facing upwards) of the cylinder 41. When the mounting base 4 is inserted into the mounting hole 114, the outer wall of the cylinder 41 faces the longitudinally distal end (e.g., the first support surface 114a). Figure 1 As shown, the longitudinal distal end of the cylindrical portion 41 (the side of the cylindrical portion 41 facing downwards) abuts against the first support surface 114a. This abutment structure provides axial positioning and support for the mounting base 4; in this embodiment, the first support surface 114a can also be a conical surface.

[0037] The temperature-sensitive component 5 is used to measure the temperature of the medium flowing through the interface tube 112. It includes a temperature-sensitive element 51 and several terminals 52. The temperature-sensitive element 51 is directly disposed in the internal cavity of the interface tube 112, so that its temperature-sensing part can be exposed to the flowing medium to the maximum extent, thereby achieving fast and accurate temperature measurement.

[0038] One end (the proximal end) of several terminals 52 is connected to the temperature-sensitive element 51. The other end (the distal end) of the terminals 52 extends longitudinally to the distal end side, passes through the mounting base 4, and is electrically connected to the electronic module assembly 2. The terminals 52 are used to transmit electrical signals from the temperature-sensitive element 51 to the electronic module assembly 2.

[0039] Specifically, the mounting base 4 has through-holes 44 along its longitudinal direction. Terminals 52 pass through these through-holes 44. The number of through-holes 44 matches the number of terminals 52; for example, a two-wire thermistor requires two through-holes 44, while a three-wire or four-wire platinum resistance thermometer requires three or four corresponding through-holes 44. In this embodiment, the through-holes 44 are located on the plate 111.

[0040] Preferably, a seal is formed between the terminal 52 and the terminal through hole 44 by sintered glass 6.

[0041] In this embodiment, the longitudinal proximal end of the sintered glass 6 (e.g. Figure 1 The bottom end of the sintered glass 6 can be relatively enlarged to form an enlarged portion 61. The enlarged portion 61 can increase the contact area between the glass and the plate 111.

[0042] In this embodiment, the longitudinal distal surface of the plate 111 (the upper surface of the plate 111) is flush with the longitudinal distal surface of the mounting base 4 (the top surface of the cylindrical portion 41).

[0043] As another preferred embodiment, a heat insulation sleeve can be fitted over the temperature-sensitive element 51. The heat insulation sleeve can be fixed to the pressure port 11 or can be fixedly wrapped around the outside of the temperature-sensitive element 51. The heat insulation sleeve is made of a material with relatively low thermal conductivity (e.g., organic foam material) such as a polymer. Its design allows at least a portion of the temperature-sensing surface of the temperature-sensitive element 51 (e.g., a portion of the head or side) to be exposed in the inner cavity of the interface tube 112, directly contacting the medium. A receiving portion can be formed on the inner wall of the interface tube 112 to at least partially accommodate the longitudinal extension of this heat insulation sleeve. The receiving portion provides support for the temperature-sensitive element 51, reducing terminal fatigue caused by vibration. The heat insulation sleeve can separate the temperature-sensitive element 51 from the interface tube 112, reducing heat exchange between them, thereby reducing the impact of the interface tube 112 on the temperature-sensitive element 51. Generally speaking, since the mass of the pressure port 11 is much greater than the mass of the temperature-sensitive element 51, the heat it can absorb or release is much greater than that of the temperature-sensitive element 51, thus forming a thermal inertia similar to that of the ocean. Therefore, this configuration of the temperature and pressure sensor reduces the temperature signal hysteresis caused by the thermal inertia of the pressure interface 11. The heat insulation sleeve can be perforated (e.g., mesh), thereby improving heat exchange with the measured medium while reducing the thermal inertia of the pressure interface 11. More preferably, the heat insulation sleeve can be made of an elastic material, thus providing mechanical protection for the temperature-sensitive element 51. In this case, the outer wall of the heat insulation sleeve can also abut against the inner wall of the interface tube 112 to simultaneously improve the vibration resistance of the temperature-sensitive element 51.

[0044] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A temperature and pressure sensor with a valve push rod, characterized in that, include: The housing includes a metal pressure port, the pressure port comprising a laterally extending plate and an interface tube integrally formed from the plate toward a longitudinal proximal end for introducing a medium to be measured; the interior of the interface tube is connected to the longitudinal distal end surface of the plate through a pressure hole and a mounting hole. Electronic module assembly fixed inside the housing; A pressure-sensitive element is hermetically fixed to the longitudinal distal end of the pressure orifice and electrically connected to the electronic module assembly; A mounting seat is sealed within the mounting hole, which protrudes longitudinally towards its proximal end to form a valve push rod; The temperature-sensitive component includes a temperature-sensitive element disposed within the interface tube and a plurality of terminals connected at one end to the temperature-sensitive element, wherein the other end of the terminals is sealed through the mounting base toward the longitudinal distal end and electrically connected to the electronic module assembly.

2. The temperature and pressure sensor with a valve rod as described in claim 1, characterized in that, The mounting base has a through terminal hole along the longitudinal direction, and the terminal passes through the terminal hole and is electrically connected to the electronic module assembly.

3. The temperature and pressure sensor with a valve rod as described in claim 2, characterized in that, A seal is formed between the terminal and the terminal via by sintered glass.

4. The temperature and pressure sensor with a valve rod as described in claim 2, characterized in that, The mounting base includes a longitudinally extending cylindrical portion and a plate portion enclosed at the longitudinal distal end of the cylindrical portion, the longitudinal proximal end of the cylindrical portion being sealed and welded to the longitudinal distal end of the mounting hole; the valve push rod is formed by protruding from the plate portion toward the longitudinal proximal end, and the terminal through hole is disposed on the plate portion.

5. The temperature and pressure sensor with a valve push rod as described in claim 4, characterized in that, The mounting hole has a first support surface facing the longitudinal distal end, and the outer wall of the cylinder abuts against the first support surface facing the longitudinal distal end.

6. The temperature and pressure sensor with a valve push rod as described in claim 5, characterized in that, The longitudinal proximal end of the cylinder and the longitudinal distal end of the mounting hole are circumferentially sealed together by a weld seam.

7. The temperature and pressure sensor with a valve push rod as described in claim 1, characterized in that, The valve top rod is coaxially arranged with the interface pipe.

8. The temperature and pressure sensor with a valve rod as described in claim 3, characterized in that, The longitudinal proximal end of the sintered glass is relatively enlarged to form an enlarged portion.

9. The temperature and pressure sensor with a valve rod as described in claim 1, characterized in that, The longitudinal distal surface of the plate is flush with the longitudinal distal surface of the mounting base.

10. The temperature and pressure sensor with a valve rod as described in claim 1, characterized in that, The pressure-sensitive element is a metal pressure-sensitive head.

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