Pressure and temperature sensor

Abstract

The present disclosure relates to a pressure and temperature sensor, which includes: a housing and a base in the housing, a circuit board, and a pressure sensitive element and a temperature sensitive element electrically connected to the circuit board, the housing is provided with a first groove and two protrusions, the protrusion is provided with a first through hole connected to the external environment, and the lower end of the first groove is closed; the temperature sensitive element is arranged in the first groove and includes a temperature sensing part and a conductive part, the base includes a body part and a first extension part, the first extension part is arranged in the first groove, the conductive part is placed on the first extension part, the body part is provided with a third groove and two second grooves, the pressure sensitive element is arranged in the third groove to form a sealed space, the second groove is provided with a second through hole connected to the sealed space, and the second groove is used to accommodate the protrusion so that the sealed space is connected to the first through hole. The pressure and temperature sensor disclosed in the present disclosure can provide faster response speed and better signal transmission stability.

Description

Technical Field

[0001] The present disclosure relates to the field of sensor technology, and in particular, to a pressure and temperature sensor. Background Art

[0002] Sensors play a fundamental role in industrial control systems. Traditional sensors are usually limited to a single measurement function, such as temperature sensors are dedicated to measuring temperature, and pressure sensors are dedicated to measuring pressure. However, in actual industrial applications, it is often necessary to monitor both the temperature and pressure of the same fluid at the same time. Using separate temperature sensors and pressure sensors may result in inconsistent measurement points, and correspondingly require two sets of electrical connections and media channels, which not only increases space occupancy, but also makes the installation process more cumbersome.

[0003] At present, a temperature and pressure integrated sensor that can sense temperature and pressure at the same time is used to solve the above problems. However, since the temperature and pressure integrated sensor needs to integrate two sensing systems, namely the temperature sensing system and the pressure sensing system, it is easy to cause structural instability when the sensor itself has a small packaging space and a complex structure, which may affect the response speed of the sensor and the stability of signal transmission. Utility Model Content

[0004] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0005] An object of the present disclosure is to provide a pressure and temperature sensor with fast response performance.

[0006] Another object of the present disclosure is to provide a pressure and temperature sensor with good signal transmission stability.

[0007] In order to achieve the above object, according to one aspect of the present disclosure, a pressure and temperature sensor is provided, comprising:

[0008] A shell and a base, a circuit board, a pressure sensitive element and a temperature sensitive element arranged in the shell, wherein the pressure sensitive element and the temperature sensitive element are electrically connected to the circuit board, the shell is provided with two protrusions and a first groove located between the two protrusions, each protrusion is provided with a first through hole communicating with the external environment, and the lower end of the first groove is closed,

[0009] The temperature sensitive element is arranged in the first groove, the temperature sensitive element includes a temperature sensing portion and a conductive portion for electrically connecting the temperature sensing portion to the circuit board, the base includes a body portion and a first extension portion extending downward from the lower surface of the body portion, the first extension portion is arranged in the first groove, and the conductive portion is placed on the first extension portion,

[0010] The main body is provided with two second grooves on its lower surface and a third groove on its upper surface, the pressure sensitive element is arranged in the third groove to form a sealed space between the pressure sensitive element and the third groove, each of the two second grooves is provided with a second through hole connected to the sealed space, and the two second grooves are respectively used to accommodate two protrusions to connect the sealed space with the two first through holes.

[0011] In some embodiments, the first groove may be located at a center line of the housing, and the two protrusions may be symmetrically arranged on both sides of the center line of the housing.

[0012] In some embodiments, the second through hole may be disposed perpendicular to the pressure sensing surface of the pressure sensitive element.

[0013] In some embodiments, the conductive portion may be a connecting conductor manufactured integrally with the temperature sensing portion.

[0014] In some embodiments, the conductive portion may be formed integrally with the first elongated portion by injection molding.

[0015] In some embodiments, the body portion may be provided with a fourth groove, the fourth groove may extend at a lower surface and on a side surface of the body portion, and the conductive portion may be arranged in the fourth groove.

[0016] In some embodiments, the pressure sensitive element may be rectangular and provided with four pins for electrical connection with a circuit board, and the four pins may be led out from four corners of the rectangle respectively.

[0017] In some embodiments, the protrusion may be sealingly arranged in the corresponding second groove by a sealing ring, wherein the sealing ring may be disposed between an outer circumferential surface of the protrusion and an inner circumferential surface of the second groove.

[0018] In some embodiments, the housing may be provided at its lower end with a mounting portion for mounting the pressure and temperature sensor to an external pipeline, and the mounting portion may be provided therein with a third through hole for connecting the first through hole with the external environment.

[0019] In some embodiments, the first groove may extend downward through the mounting portion, and the first groove may include an extension sleeve at its lower end extending downward beyond the lower end surface of the mounting portion, and the temperature sensitive element may be arranged in the extension sleeve.

[0020] According to the above technical solution, firstly, a dual pressure sensing channel is formed through the structural design of the shell and the base, so that the pressure sensitive element can respond to the pressure change of the fluid to be measured more quickly, thereby improving the response speed of the pressure temperature sensor. In addition, the dual pressure sensing channels formed are arranged symmetrically about the pressure sensitive element, thereby improving the overall force uniformity of the pressure sensitive element, which is beneficial to prolonging the service life of the pressure sensitive element and the pressure temperature sensor. In addition, by using the first extension part to provide support and stabilization for the conductive part, the connection stability between the conductive part and the temperature sensitive element and the circuit board is improved, thereby improving the stability of the temperature signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of the embodiments of the present disclosure will become more easily understood through the following description with reference to the accompanying drawings. The drawings are not drawn to scale and some features may be exaggerated or reduced to show details of particular components.

[0022] In the attached picture:

[0023] Figure 1 is a schematic cross-sectional view of a pressure and temperature sensor according to an embodiment of the present disclosure.

[0024] Figure 2 FIG. 4 is another schematic cross-sectional view of a pressure and temperature sensor according to an embodiment of the present disclosure.

[0025] Figure 3 is a schematic cross-sectional view of a housing of a pressure and temperature sensor according to an embodiment of the present disclosure.

[0026] Figure 4 is a schematic cross-sectional view of a base of a pressure and temperature sensor according to an embodiment of the present disclosure.

[0027] In the drawings, the same or corresponding technical features or components are represented by the same or corresponding reference numerals. DETAILED DESCRIPTION

[0028] The present disclosure is described in detail below with reference to the accompanying drawings by means of exemplary embodiments. It should be noted that the following detailed description of the present disclosure is only for illustrative purposes and is by no means a limitation of the present disclosure.

[0029] It should be noted that, for the sake of clarity, not all features of a specific implementation are described and illustrated in the specification and drawings. Furthermore, in order to avoid unnecessary details obscuring the technical solution focused on by the present disclosure, only the device structure closely related to the technical solution of the present disclosure is described and illustrated in the specification and drawings, while other details that have a low relevance to the technical content of the present disclosure and are known to those skilled in the art are omitted.

[0030] Reference Figures 1 to 4 According to an embodiment of the present disclosure, a pressure-temperature sensor 1 is provided, which includes a housing 10 and a base 20 , a circuit board 30 , a pressure sensitive element 40 , and a temperature sensitive element 50 disposed in the housing 10 .

[0031] like Figure 1 and Figure 2 As shown in FIG. 1 , the housing 10 may include an upper housing 101 and a lower housing 102 . The upper housing 101 and the lower housing 102 may be matched and connected to each other to form an internal cavity to accommodate the base 20 , the circuit board 30 , the pressure sensitive element 40 , and the temperature sensitive element 50 .

[0032] The pressure sensitive element 40 can be used to detect the pressure change of the fluid to be measured and convert it into a pressure signal. The pressure sensitive element 40 can be a capacitive pressure sensitive element, a resistive pressure sensitive element, or any other suitable type of pressure sensitive element. The temperature sensitive element 50 can be used to detect the temperature change of the fluid to be measured and convert it into a temperature signal. The temperature sensitive element 50 can be a thermistor, a platinum resistor, or any other suitable type of temperature sensitive element.

[0033] The pressure sensitive element 40 and the temperature sensitive element 50 are both electrically connected to the circuit board 30 so that the circuit board 30 receives the pressure signal and the temperature signal and can process them accordingly. The circuit board 30 can be a flexible circuit board, but is not limited thereto. The circuit board 30 can be electrically connected to other external devices such as a display, a data logger, etc. For example, a metal terminal for electrically connecting the circuit board 30 and the external device is provided in the upper housing 101.

[0034] The housing 10 is provided with two protrusions 110 and a first groove 120 between the two protrusions 110 . Each protrusion 110 is provided with a first through hole 111 communicating with the external environment, and the lower end of the first groove 120 is closed.

[0035] For example, Figure 3 As shown in FIG. 1 , two protrusions 110 and a first groove 120 may be disposed inside the lower housing 102. The upper opening of the first through hole 111 in the protrusion 110 may face the inner space of the lower housing 102, and the lower opening thereof is communicated with the external environment, thereby forming a channel for the fluid to be measured to pass through.

[0036] The temperature sensitive element 50 includes a temperature sensing portion 510 and a conductive portion 520 for electrically connecting the temperature sensing portion 510 to the circuit board 30. The temperature sensitive element 50 is arranged in the first groove 120. The lower end of the first groove 120 is closed to isolate its internal space from the external environment to prevent the fluid to be measured from entering the first groove 120. As a result, the temperature sensitive element 50 can sense the temperature of the fluid through heat conduction of the housing 10 without contacting the fluid in the external environment, thereby realizing the sensing of the temperature of the fluid to be measured.

[0037] Reference Figure 1 and 4 The base 20 includes a main body 210 and a first extension portion 220 extending downward from the lower surface of the main body 210. Figure 1 As shown in , the first extension portion 220 is arranged in the first groove 120, and the conductive portion 520 is placed on the first extension portion 220. In this case, the first extension portion 220 can provide support and retention for the conductive portion 520, which helps to improve the connection stability between the temperature sensitive element 50 and the circuit board 30, thereby improving the stability of temperature signal transmission.

[0038] For example, the conductive portion 520 may be a separate element. Figure 1 As shown in , the conductive part 520 can be connected to the pin of the temperature sensing part 510 at one end thereof, such as the lower end, for example, by welding, and electrically connected to the circuit board 30 at the other end thereof, such as the upper end.

[0039] It is conceivable that the conductive part 520 may be a part that is integrated with the temperature sensing part 510 and / or the circuit board 30. For example, the conductive part 520 may be a connecting conductor that is manufactured integrally with the temperature sensing part 510, thereby eliminating the need for connecting the conductive part 520 to the temperature sensing part 510, reducing the risk of failure due to improper connection, thereby making the temperature signal transmission more reliable, and also reducing the influence of the connection point on the response speed and measurement accuracy.

[0040] Reference Figure 1 , Figure 3 and Figure 4 The body part 210 is provided with two second grooves 211 at its lower surface and a third groove 212 at its upper surface. The pressure sensitive element 40 is arranged in the third groove 212 to form a sealed space 410 between the pressure sensitive element 40 and the third groove 212. Each of the two second grooves 211 is provided with a second through hole 213 communicating with the sealed space 410, and the two second grooves 211 are respectively used to accommodate the two protrusions 110 so that the sealed space 410 is communicated with the two first through holes 111.

[0041] For example, Figure 1 As shown in , the pressure sensitive element 40 can be arranged in the third groove 212 with the help of the axial sealing ring 420 in such a way that its lower surface faces the third groove 212, and the lower surface serves as a pressure sensing surface to form a sealed space 410 with the third groove 212. It should be understood that the pressure sensing surface refers to the surface of the pressure sensitive element 40 that is in direct contact with the measured fluid.

[0042] With this design, the two first through holes 111 and the two second through holes 213 respectively form two pressure sensing channels for the pressure sensitive element 40 that allow the fluid to be measured to pass through, and the two pressure sensing channels are connected to each other at the sealed space 410 .

[0043] By forming such a dual pressure sensing channel, the pressure sensing channel can have a larger flow channel cross-sectional area as a whole, thereby helping to reduce the resistance of the measured fluid in the process of flowing to the pressure sensitive element, so that the pressure of the measured fluid can be transmitted to the pressure sensing surface more quickly, so that the pressure sensitive element responds to the pressure change of the measured fluid more quickly, and improves the response speed of the pressure temperature sensor. In addition, the two pressure sensing channels are connected to each other in the sealed space, which can further speed up the contact between the measured fluid and the pressure sensing surface.

[0044] In addition, the dual pressure sensing channels can also provide a redundant design. For example, if one of the pressure sensing channels fails or is blocked, the other one can still work normally, thereby improving the reliability of the pressure and temperature sensor 1.

[0045] It is conceivable that the second through hole 213 can be arranged to be perpendicular to the pressure sensing surface of the pressure sensitive element 40 so that the fluid to be measured flows perpendicularly to the pressure sensing surface and exerts pressure on it, thereby allowing the fluid to reach the pressure sensing surface faster, helping to further improve the response speed of the pressure temperature sensor.

[0046] In some embodiments, Figure 3 As shown in the figure, the first groove 120 can be located at the center line of the shell 10, for example, at the center line of the lower shell 102, and the two protrusions 110 can be symmetrically arranged on both sides of the center line of the shell 10, for example, symmetrically arranged on both sides of the center line of the lower shell 102.

[0047] Correspondingly, if Figure 4 As shown in , the first elongated portion 220 corresponding to the first groove 120 may be located at the center line of the base 20 , and the two second grooves 211 corresponding to the two protrusions 110 may be symmetrically arranged on both sides of the center line of the base 20 .

[0048] It should be understood that the pressure sensitive element 40 can be arranged to have the same center line as the housing 10 and the base 20. In this case, the two pressure sensing channels formed by the first through hole 111 of the protrusion 110 and the corresponding second through hole 213 of the second groove 211 can be symmetrically distributed on both sides of the center line of the pressure sensitive element 40.

[0049] In this way, the fluid pressure on the pressure sensitive element is more uniform, which improves the stability and reliability of the voltage sensing effect. In addition, this method is also conducive to reducing the risk of damage to the pressure sensitive element due to uneven force, thereby extending the service life of the pressure sensitive element and the entire pressure and temperature sensor.

[0050] In some embodiments, Figure 2 As shown in FIG, the number of the conductive parts 520 may be two, which are arranged symmetrically about the center line of the base 20. Figure 2 and Figure 4 In accordance with the configuration of the base 20 shown in FIG, each conductive portion 520 may include a lower vertical section and an upper bent section. Specifically, the lower vertical section may extend parallel to the first elongated portion 220 of the base 20. The upper bent section may extend along the lower surface and side surface of the body portion 210 of the base 20. It is understood that the configuration of the base 20 and the structure of the conductive portion 520 are not limited thereto.

[0051] In some embodiments, Figure 4 As shown in , the conductive portion 520 can be formed as one piece with the first extension portion 220. For example, the conductive portion 520 can be formed as one piece with the first extension portion 220 by injection molding. However, the specific method is not limited to the injection molding method. For example, the conductive portion 520 can also be formed as one piece with the first extension portion 220 by other chemical methods such as bonding, hot melting and other processes.

[0052] By forming the conductive part and the first elongated part into an integral structure, the first elongated part can provide a more stable support for the conductive part, which is conducive to simplifying the assembly process of the conductive part and the base. When the conductive part and the temperature sensing part are welded, it is also conducive to reducing the welding difficulty of the two.

[0053] In addition, the above method is helpful to fix the two conductive parts 520 separated from each other in their corresponding positions, thereby avoiding signal interference, signal instability and even failure caused by accidental entanglement or contact between the two when the two are not fixed.

[0054] For example, the conductive portion 520 may be injection molded with the first elongated portion 220 via its lower vertical section. It is conceivable that the upper bent section of the conductive portion 520 may be injection molded with the body portion 210 .

[0055] In some embodiments, the body portion 210 may be provided with a fourth groove, the fourth groove may extend on the lower surface and the side surface of the body portion, and the conductive portion 520 is arranged in the fourth groove. Exemplarily, the body portion 210 may be provided with two fourth grooves arranged symmetrically about the center line of the base 20, and the two conductive portions 520 may be arranged in the two fourth grooves, respectively.

[0056] For example, Figure 2 As shown in the figure, the conductive portion 520 can partially (specifically the upper bending section) extend along its corresponding fourth groove from the lower surface of the main body portion 210 to bypass its side surface, and continue to extend upward along the side surface until it is connected to the circuit board 30 located above the main body portion 210.

[0057] The fourth groove can provide mechanical support for the conductive part, which helps to reduce the impact of vibration or impact on the conductive part, thereby improving its stability. In addition, the fourth groove allows the conductive part to be directly observed from the outside, which is convenient for checking the state of the conductive part, thereby facilitating fault diagnosis or performance analysis.

[0058] It is conceivable that the first elongated portion 220 may be provided with two fifth grooves symmetrically arranged about the center line of the first elongated portion 220, so that the conductive portion 520 may be partially (specifically, the lower vertical section) arranged in the fifth groove.

[0059] In some embodiments, the pressure sensitive element 40 may be rectangular and may be provided with four pins for electrically connecting to the circuit board 30 , and the four pins may be led out from four corners of the rectangle, respectively.

[0060] For example, the pressure sensitive element 40 may be provided with a sensing circuit therein, and four pins may be led out from the sensing circuit by punching, for example. Specifically, one end of each pin is electrically connected to the sensing circuit, and the other end is electrically connected to the circuit board 30, so as to transmit signals between the pressure sensitive element 40 and the circuit board 30.

[0061] The rectangular pressure sensitive element takes up little space and is convenient for pin arrangement. In addition, by arranging the pins at the four corners of the rectangle, the distance between the pins is relatively large, which can effectively reduce the risk of short circuit between the pins, making the voltage sensing effect of the pressure sensitive element and the transmission of the pressure signal more stable.

[0062] In some embodiments, reference Figure 1 , Figure 3 and Figure 4 The protrusion 110 may be sealingly arranged in the corresponding second groove 211 via a sealing ring 130 , wherein the sealing ring 130 may be disposed between an outer circumferential surface of the protrusion 110 and an inner circumferential surface of the second groove 211 .

[0063] Exemplarily, the outer diameter of the protrusion 110 and the inner diameter of the second groove 211 can be configured so that when the protrusion 110 is arranged in the second groove 211, the sealing ring 130 located between the outer circumferential surface of the second groove 211 and the inner circumferential surface of the protrusion 110 is compressed in the radial direction, thereby providing a radial seal to prevent the fluid from entering the first groove 101 through the pressure sensing channel and contacting the temperature sensitive element 50, the circuit board 30, etc., thereby causing a circuit failure.

[0064] By providing a radial seal between the protrusion 110 and the second groove 211, the assembly tolerance requirement is lower, so it is easier to assemble. In addition, the use of radial seal is more conducive to forming a uniform pressure distribution on the sealing surface, thereby helping to improve the sealing reliability of the pressure sensing channel.

[0065] In some embodiments, Figures 1 to 3 As shown in FIG. 1 , the housing 10 may be provided at its lower end with a mounting portion 140 for mounting the pressure and temperature sensor 1 to an external pipeline, and the mounting portion 140 may be provided therein with a third through hole 141 for connecting the first through hole 111 with the external environment.

[0066] In this case, a relatively long pressure sensing channel is obtained through the third through hole, which not only helps to reduce the sensitivity of the pressure sensitive element to flow rate changes, but also helps to distribute the pressure of the fluid more evenly in the pressure sensing channel and reduce local pressure peaks, thereby improving the accuracy of pressure detection.

[0067] Exemplarily, the mounting portion 140 may have an external thread to mount the pressure and temperature sensor 1 to an external pipeline in a threaded manner, thereby detecting the pressure and temperature of the fluid in the external pipeline. It is understandable that the mounting portion 140 may also be other types of mounting portions connected in any other suitable manner.

[0068] In some embodiments, Figure 1 and Figure 2 As shown in , the mounting portion 140 may be provided with a sealing ring 142 on its exterior to improve the sealing performance of the connection between the pressure and temperature sensor and the external pipeline, thereby improving the stability and reliability of the detection process.

[0069] In some embodiments, the first groove 120 may extend downward through the mounting portion 140 , and the first groove 120 may include an extension sleeve 121 at its lower end extending downward beyond the lower end surface of the mounting portion 140 , and the temperature sensitive element 50 is disposed in the extension sleeve 121 .

[0070] In this case, the temperature sensitive element can be isolated from the external environment by means of the extension sleeve. In addition, by providing the extension sleeve extending beyond the lower end surface of the mounting portion, it is convenient to extend into the fluid for temperature sensing, thereby improving the sensitivity and accuracy of temperature sensing.

[0071] It is conceivable that the extension sleeve 121 may be a separate piece, and the extension sleeve 121 may be connected to the first groove 120 at the lower end surface of the mounting portion 140. For example, the extension sleeve 121 may be connected to the first groove 120 by press fitting, welding or threaded sealing.

[0072] In the present disclosure, the terms "first", "second", "third", "fourth", "fifth", etc. are used only for the purpose of convenience of description and should not be regarded as limiting. In addition, although the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the specific embodiments described and shown in detail herein. Those skilled in the art may make various changes to the exemplary embodiments without departing from the scope defined by the claims of the present disclosure.

[0073] The features mentioned and / or shown in the above description of the exemplary embodiments of the present disclosure may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other embodiments. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present disclosure.

Claims

1. A pressure and temperature sensor, characterized in that: include: A shell and a base, a circuit board, a pressure sensitive element and a temperature sensitive element arranged in the shell, wherein the pressure sensitive element and the temperature sensitive element are both electrically connected to the circuit board, the shell is provided with two protrusions and a first groove located between the two protrusions, each protrusion is provided with a first through hole communicating with the external environment, and the lower end of the first groove is closed, The temperature sensitive element is arranged in the first groove, the temperature sensitive element includes a temperature sensing portion and a conductive portion for electrically connecting the temperature sensing portion with the circuit board, the base includes a body portion and a first elongated portion extending downward from a lower surface of the body portion, the first elongated portion is arranged in the first groove, and the conductive portion is placed on the first elongated portion, The main body is provided with two second grooves on its lower surface and a third groove on its upper surface, the pressure sensitive element is arranged in the third groove to form a sealed space between the pressure sensitive element and the third groove, each of the two second grooves is provided with a second through hole communicating with the sealed space, and the two second grooves are respectively used to accommodate the two protrusions so that the sealed space is communicated with the two first through holes.

2. The pressure and temperature sensor according to claim 1, characterized in that: The first groove is located at the center line of the housing, and the two protrusions are symmetrically arranged on both sides of the center line of the housing.

3. The pressure and temperature sensor according to claim 1, characterized in that: The second through hole is arranged to be perpendicular to the pressure sensing surface of the pressure sensitive element.

4. The pressure and temperature sensor according to claim 1, characterized in that: The conductive part is a connecting conductor manufactured integrally with the temperature sensing part.

5. The pressure and temperature sensor according to claim 1, characterized in that: The conductive portion is formed integrally with the first elongated portion by injection molding.

6. The pressure and temperature sensor according to claim 5, characterized in that: The body portion is provided with a fourth groove extending at the lower surface and on the side surface of the body portion, and the conductive portion is arranged in the fourth groove.

7. The pressure and temperature sensor according to claim 1, characterized in that: The pressure sensitive element is rectangular and is provided with four pins for being electrically connected to the circuit board, and the four pins are respectively led out from four corners of the rectangle.

8. The pressure and temperature sensor according to claim 1, characterized in that: The protrusion is sealingly arranged in the corresponding second groove via a sealing ring, wherein the sealing ring is disposed between an outer peripheral surface of the protrusion and an inner peripheral surface of the second groove.

9. The pressure and temperature sensor according to claim 1, characterized in that: The housing is provided at its lower end with a mounting portion for mounting the pressure and temperature sensor to an external pipeline, and the mounting portion is provided inside with a third through hole for connecting the first through hole with an external environment.

10. The pressure and temperature sensor according to claim 9, characterized in that: The first groove extends downwardly through the mounting portion, and the first groove includes an extension sleeve at its lower end extending downwardly beyond the lower end surface of the mounting portion, and the temperature sensitive element is arranged in the extension sleeve.

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