CN222049121U - Pressure and temperature sensors - Google Patents

Abstract

The present disclosure relates to a pressure and temperature sensor, which includes: a housing, provided with a first groove and a second groove, the first groove is provided with a first through hole communicating with an external environment, and the lower end of the second groove is closed; and a base, a circuit board, and a pressure sensitive element and a temperature sensitive element electrically connected to the circuit board in the housing, the temperature sensitive element is arranged in the second groove, the base includes a body part and a first extension part and a second extension part, the body part is provided with a third groove on its upper surface, the pressure sensitive element is sealedly arranged in the third groove to form a sealed space, the first extension part is sealedly arranged in the first groove and provided with a second through hole communicating with the sealed space and the first through hole, the second extension part is arranged in the second groove, and a connector for electrically connecting the temperature sensitive element to the circuit board is placed on the second extension part. The pressure and temperature sensor of the present disclosure can provide better sealing performance and signal transmission stability.

Description

Pressure and temperature sensor

Technical Field

The present disclosure relates to the field of sensor technology, and in particular, to pressure and temperature sensors.

Background

Sensors are an important component in industrial control systems. Conventional sensors are typically only used to measure one type of information, e.g., conventional pressure sensors are only used to measure pressure. However, in an actual use scenario, it is often necessary to acquire temperature and pressure information of the same fluid at the same time. If an independent temperature sensor and a pressure sensor are adopted, the identity of the measured point position is difficult to ensure, two sets of electric wire harnesses and medium channels are needed during installation, the occupied space is large, and the installation is not convenient enough.

At present, the above-mentioned problems are solved by adopting a temperature and pressure integrated sensor capable of simultaneously sensing temperature and pressure. However, with the temperature and pressure integrated sensor, since two sets of sensing systems, i.e., a temperature sensing system and a pressure sensing system, are required to be integrated therein, in the case that the sensor itself has a small packaging space and a complex structure, the structure is easily unstable, and thus problems such as poor sealing, unstable signals, etc. may occur.

Disclosure of utility model

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

An object of the present disclosure is to provide a pressure-temperature sensor with good sealing.

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

In order to achieve the above object, there is provided a pressure-temperature sensor including:

a housing provided with a first groove and a second groove separately arranged inside thereof, the first groove being provided with a first through hole communicating with the external environment, and a lower end of the second groove being closed; and

A base, a circuit board, a pressure sensitive element and a temperature sensitive element which are arranged in the shell, wherein the pressure sensitive element and the temperature sensitive element are electrically connected to the circuit board, and the temperature sensitive element is arranged in the second groove,

The base includes a body portion provided at an upper surface thereof with a third groove, and a first extension portion and a second extension portion extending downward from a lower surface of the body portion, the pressure sensitive element being sealingly arranged in the third groove by a first seal ring to form a sealed space between the pressure sensitive element and the third groove, the first extension portion being sealingly arranged in the first groove by a second seal ring and provided with a second through hole communicating with the sealed space and the first through hole, the second extension portion being arranged in the second groove, and a connection member for electrically connecting the temperature sensitive element with the circuit board being arranged on the second extension portion.

In some embodiments, the first and second extensions may be disposed on both sides of a center line of the lower surface of the base, respectively.

In some embodiments, a first seal ring may be disposed between a lower surface of the pressure sensitive element and a bottom surface of the third groove, and a second seal ring may be disposed between an outer peripheral surface of the first extension and an inner peripheral surface of the first groove.

In some embodiments, the connector may be removably positioned on the base.

In some embodiments, the base may be provided with a fourth recess on the outer surfaces of the body portion and the second elongate portion, the connector being disposed within the fourth recess.

In some embodiments, a width of at least a portion of the opening of the fourth groove extending in the longitudinal direction thereof may be smaller than a dimension of a portion of the connection member corresponding to the at least a portion in the width direction of the opening.

In some embodiments, the housing may be provided at a lower end thereof with a mounting portion for mounting the pressure temperature sensor to an external pipe, a lower end hole of the first through hole being located at a lower end face of the mounting portion, and the second groove extending downward beyond the lower end face of the mounting portion to form an extension sleeve, the temperature sensitive element being disposed within the extension sleeve.

In some embodiments, the extension sleeve may be integrally formed with the housing.

In some embodiments, the extension sleeve may house a thermally conductive medium inside it for conducting heat from the fluid to be sensed to the temperature sensitive element.

In some embodiments, the housing may include an upper housing and a lower housing, the upper housing and the lower housing being connected by a clinch.

According to the above technical solution, the pressure sensing channel is defined by the sealed space, the second through hole and the first through hole, and the temperature sensing channel is defined by the second groove and the channel in the base for receiving the connection member, thereby simultaneously realizing the sensing of the pressure and the temperature of the fluid to be sensed. In addition, by arranging the pressure sensitive element in the third groove and by providing a seal between the pressure sensitive element and the third groove by means of the first sealing ring, it is possible to prevent the fluid in the pressure sensing channel from coming into contact with the circuit or the metal terminals on the circuit board, resulting in a circuit failure; by arranging the first extension in the first groove and by providing a seal between the first groove and the first extension by means of the second sealing ring, it is possible to prevent the fluid in the pressure sensing channel from coming into contact with the temperature sensitive element and the connection leading to a malfunction of the circuit, whereby the tightness of the sensor is improved. In addition, by arranging the second elongated portion in the second groove and disposing the connection member on the second elongated portion, the connection member extending in the second groove can be protected and stabilized, thereby improving the stability of the temperature signal transmission.

Drawings

Features and advantages of embodiments of the present disclosure will become more readily appreciated from the following description with reference to the accompanying drawings. The figures are not drawn to scale and some features may be exaggerated or minimized to show details of particular components.

In the drawings:

fig. 1 is a schematic cross-sectional view of a pressure temperature sensor according to an embodiment of the present disclosure.

Fig. 2 is a schematic cross-sectional view of the lower housing of the pressure-temperature sensor shown in fig. 1.

Fig. 3 is a schematic exploded view of a pressure temperature sensor according to an embodiment of the present disclosure.

Fig. 4 is a schematic assembly view of a pressure temperature sensor according to an embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of the base of the pressure-temperature sensor shown in fig. 1.

Fig. 6 is a schematic cross-sectional view of the sensing assembly of the pressure temperature sensor shown in fig. 1.

In the drawings, the same or corresponding technical features or components are denoted by the same or corresponding reference numerals.

Detailed Description

The disclosure is described in detail below with the aid of exemplary embodiments with reference to the accompanying drawings. It is noted that the following detailed description of the present disclosure is for purposes of illustration only and is in no way limiting of the present disclosure.

It should be noted that, for the sake of clarity, not all features of a specific embodiment are described and shown in the specification and drawings, and, to avoid unnecessary detail obscuring the technical solutions of interest to the present disclosure, only device structures closely related to the technical solutions of the present disclosure are described and shown in the specification and drawings, while other details that are not relevant to the technical content of the present disclosure and known to those skilled in the art are omitted.

Referring to fig. 1 to 6, according to an embodiment of the present disclosure, there is provided a pressure temperature sensor 1 including a housing 10 and a sensing assembly 20 disposed within the housing 10.

The housing 10 is provided at the inside thereof with a first groove 101 and a second groove 102 which are separately arranged, the first groove 101 is provided with a first through hole 1011 communicating with the outside environment, and the lower end of the second groove 102 is closed.

As shown in fig. 1 to 3, the housing 10 may include an upper housing 10a and a lower housing 10b. The upper case 10a is provided at the inside thereof with a metal terminal for connecting an external power source to the pressure temperature sensor 1 and transmitting a pressure signal and a temperature signal sensed by the pressure temperature sensor 1. The lower case 10b is configured to be connectable with the upper case 10a to define an accommodating space inside the case 10. Illustratively, as shown in fig. 2, the first groove 101 and the second groove 102 are provided inside the lower case 10b, and the first groove 101 and the second groove 102 each extend vertically downward to be arranged apart from each other, that is, independent of each other, not interfering with each other. An upper end opening of the first through-hole 1011 in the first groove 101 is shown on the bottom surface 101a of the first groove 101, and a lower end opening communicates with the outside environment; and the lower end of the second groove 102 is closed such that the inner space of the second groove 102 is isolated from the external environment. It is contemplated that housing 10 may take any other suitable form.

The sensing assembly 20 is disposed in an inner space defined by the upper case 10a and the lower case 10 b. The sensing assembly 20 includes a base 201, a circuit board 202, a pressure sensitive element 203, and a temperature sensitive element 204.

The circuit board 202 is electrically connected to the metal terminals described above and to the pressure sensitive element 203 and the temperature sensitive element 204, whereby it is possible to receive pressure signals and temperature signals from the pressure sensitive element 203 and the temperature sensitive element 204, respectively, and to output these signals through the metal terminals after processing. It is contemplated that circuit board 202 may be a flexible circuit board (as shown in fig. 1), thereby enabling flexibility in the structural design of pressure-temperature sensor 1, facilitating the integration of the temperature sensing system and the pressure sensing system in pressure-temperature sensor 1. However, it is understood that the circuit board 202 may be other types of circuit boards, such as a rigid circuit board.

The pressure sensitive element 203 may be a capacitive pressure sensitive element, a resistive pressure sensitive element, or any other suitable type of pressure sensitive element. The pressure sensitive element 203 may be provided with connection terminals for electrical connection with the circuit board 202, for example, as shown in fig. 1, the circuit board 202 may be arranged above the pressure sensitive element 203 and electrically connected with the pressure sensitive element 203 through the connection terminals. Furthermore, as shown in fig. 1 and 3, the pressure sensitive element 203 may be rectangular or square. However, other shapes of the pressure sensitive element 203 are also contemplated, such as a circular shape.

Temperature sensing element 204 may be a thermistor, platinum resistor, or any other suitable type of temperature sensing element. The temperature sensitive element 204 is disposed within the second recess 102 and may be electrically connected to the circuit board 202, for example, by a connector 600 (see fig. 1 and 3). It will be appreciated that the connector 600 may be a separate component, such as a metal wire, or may be an integral part of the temperature sensitive element 204 and/or the circuit board 202.

Referring to fig. 1, 3, 5 and 6, the base 201 includes a body portion 2011 and first and second extension portions 2012 and 2013 extending downward from a lower surface 2011a of the body portion 2011, the body portion 2011 is provided at an upper surface thereof with a third groove 2014, the pressure sensitive element 203 is sealingly arranged within the third groove 2014 by the first seal ring 300 to form a sealed space 400 between the pressure sensitive element 203 and the third groove 2014, the first extension portion 2012 is sealingly arranged within the first groove 101 by the second seal ring 500 and provided with a second through hole 2015 communicating with the sealed space 400 and the first through hole 1011, the second extension portion 2013 is arranged within the second groove 102, and the connector 600 for electrically connecting the temperature sensitive element 204 with the circuit board 202 is seated on the second extension portion 2013.

The sealed space 400 is defined by the pressure sensitive element 203, the first sealing ring 300, and the third groove 2014, and the sealed space 400 communicates with the external environment through the second through hole 2015 and the first through hole 1011. Thereby, the fluid to be sensed can enter the sealed space 400 from the external environment via the first through hole 1011 and the second through hole 2015 and thus be in contact with the pressure sensitive element 203, so that sensing of the pressure of the fluid to be sensed can be achieved. In addition, a temperature sensitive element 204 is disposed within the second recess 102 and is electrically connected to the circuit board 202 by a connector 600. Thus, the temperature sensing element 204 can sense the temperature of the fluid to be measured through the heat conduction of the housing 10 without contacting the fluid in the external environment, thereby enabling the sensing of the temperature of the fluid to be measured. In this way, sensing of the pressure and temperature of the fluid to be measured can be achieved simultaneously.

Further, by disposing the pressure sensitive element 203 in the third groove 2014 and by providing a seal between the pressure sensitive element 203 and the third groove 2014 by means of the first seal ring 300, it is possible to prevent the fluid entering the sealed space 400 from escaping from the gap between the pressure sensitive element 203 and the third groove 2014, and further it is possible to prevent the fluid from coming into contact with an electric circuit in the pressure temperature sensor 1, such as an electric circuit or a metal terminal on the circuit board 202, resulting in an electric circuit failure. Moreover, by disposing the first extension 2012 in the first groove 101 and by providing a seal between the first groove 101 and the first extension 2012 by means of the second seal ring 500, it is possible to prevent fluid from escaping from the boundary of the first through hole 1011 and the second through hole 2015 via the first groove 101, and further it is possible to prevent the fluid from coming into contact with the temperature sensitive element 204, the connector 600, or the like, thereby causing a circuit failure.

Also, by disposing the second extension 2013 within the second recess 102 and seating the connector 600 on the second extension 2013, the connector 600 extending in the second recess 102 can be protected and secured, thereby making the electrical connection between the temperature sensitive element 204 and the circuit board 202 more stable, and thus improving the stability of temperature signal transmission.

Through the structure, the pressure and the temperature of the fluid to be measured can be sensed through the single sensor, a better sealing effect can be obtained, the risk of sensor circuit faults caused by fluid leakage is reduced, the service life is prolonged, the stability of temperature signal transmission can be improved, and a better temperature sensing effect is obtained.

In some embodiments, as shown in fig. 1, the first and second extensions 2012, 2013 may be disposed on either side of a centerline of the lower surface 2011a of the base 201, respectively.

That is, the first extension 2012 and the second extension 2013 are disposed on two halves of the lower surface 2011a of the base 201, respectively. For example, in the case where the lower surface 2011a of the base 201 is circular, the first extension 2012 and the second extension 2013 are disposed on both sides of the diameter of the lower surface 2011a, respectively, i.e., on two semicircular regions of the lower surface 2011a, respectively.

In this way, the second through-hole 2015 of the first extension 2012 can be spaced a greater distance from the second extension 2013, thereby enabling the fluid flowing through the second through-hole 2015 to be spaced a greater distance from the connector 600 disposed on the second extension 2013, thereby enabling the risk of fluid contacting the connector 600 due to potential fluid leakage to cause a circuit failure to be reduced.

In some embodiments, as shown in fig. 1, 2, 5, and 6, the first seal ring 300 is disposed between the lower surface 203a of the pressure sensitive element 203 and the bottom surface 2014a of the third groove 2014 to form an axial seal, and the second seal ring 500 is disposed between the outer peripheral surface 2012a of the first extension 2012 and the inner peripheral surface 101b of the first groove 101 to form a radial seal.

It will be appreciated that the first seal ring 300 provides a seal by being compressed in the axial direction, while the second seal ring 500 provides a seal by being compressed in the radial direction. For example, the connection of the upper housing 10a and the lower housing 10b may be a press-fit connection in the axial direction, such as a roll-rivet connection, such that the lower surface 203a of the pressure sensitive element 203 located within the housing 10 is pressed against the bottom surface 2014a of the third groove 2014, thereby causing the first seal ring 300 to be compressed in the axial direction to provide an axial seal. In addition, the outer diameter of the first extension 2012 and the inner diameter of the first groove 101 may be configured such that the second seal ring 500 between the outer peripheral surface 2012a of the first extension 2012 and the inner peripheral surface 101b of the first groove 101 is compressed in a radial direction when the first extension 2012 is disposed within the first groove 101, thereby providing a radial seal.

By providing a radial seal between the first extension 2012 and the first groove 101, there is only one sealing ring providing an axial seal, i.e. the first sealing ring 300 providing a seal between the pressure sensitive element 203 and the third groove 2014. Therefore, the problem that the compression amount of the sealing ring in the axial direction cannot be accurately controlled due to the fact that a plurality of sealing rings for providing axial sealing exist in the axial direction is solved, and the sealing effect is poor. In addition, since the position of the seal ring that provides the seal between the first extension 2012 and the first groove 101 is offset from the center of the lower surface 2011a of the base 201 to avoid the temperature sensor 204, in the case of the seal using the axial seal, the stress balance of the upper and lower seal rings (i.e., the first seal ring and the second seal ring) cannot be simultaneously considered, so that the seal may be unstable, and in the case of the radial seal, such a problem can be avoided, and a stable sealing effect can be obtained.

In some embodiments, the connector 600 may be removably positioned on the base 201. That is, the connector 600 may be mounted on the base 201 and may be detached from the base 201.

In this way, the connector 600 can be manufactured separately from the base 201, thereby reducing the difficulty and thus the cost of manufacturing the base 201. In addition, in the event that the connector 600 or the base 201 is damaged, only one of the damaged parts may be replaced instead of having to replace the connector 600 and the base 201 as a whole, thereby also reducing manufacturing costs.

However, it is also contemplated that the connector 600 may be fixedly disposed within the base 201 to be integrally manufactured with the base 201.

In some embodiments, the base 201 may be provided with a fourth groove on the outer surface of the body portion 2011 and the second extension portion 2013, within which the connector 600 is seated.

In this case, a fourth groove is provided along the outer surfaces of the body portion 2011 and the second extension portion 2013. For example, the fourth groove extends along the length direction of the second extension 2013 and extends around the side surface thereof along the lower surface of the body 2011, whereby the connector 600 may extend within the fourth groove to connect with the circuit board 202 located above the body 2011.

In this way, the entire connector 600 can be observed from the opening of the fourth groove extending in the longitudinal direction thereof, whereby the condition of the entire connector 600 can be observed without damaging the base 201 or disassembling the connector 600, so that the circuit can be inspected more conveniently.

It will be appreciated that where the fourth recess is provided, the connector 600 may be removably mounted to the base 201 or may be fixedly mounted to the base 201, for example, by a fastener.

It is contemplated that at least a portion of the opening of the fourth groove extending in the longitudinal direction thereof may have a width smaller than a dimension of a portion of the connector 600 corresponding to the at least a portion in the width direction of the opening.

In this case, at the portion of the connection member 600, a portion of the surface of the connection member 600 facing the opening side of the fourth groove is covered. In this way, the connector 600 can be more firmly seated in the fourth groove while still being able to view the entire connector 600, avoiding the problem of unstable signal transmission that may occur due to the connector 600 protruding from the fourth groove.

In some embodiments, referring to fig. 1 and 2, the housing 10 is provided at its lower end with a mounting portion 100 for mounting the pressure temperature sensor 1 to an external pipe, a lower end hole of the first through hole 1011 is located at a lower end face 100a of the mounting portion 100, and the second groove 102 extends downward beyond the lower end face 100a of the mounting portion 100 to form an extension sleeve 1020, and the temperature sensitive element 204 is disposed within the extension sleeve 1020.

By means of the mounting 100, the pressure temperature sensor 1 can be screwed to an external pipe in order to sense the pressure and temperature of the fluid within the external pipe. Further, by providing the extension sleeve 1020 extending beyond the lower end surface 100a of the mounting portion 100, it is possible to extend into the interior of the fluid for temperature sensing, thereby improving the sensitivity and accuracy of temperature sensing. It is contemplated that the mounting portion 100 may be a threaded mounting portion that is threadably connected, or may be another type of mounting portion that is connected by any other suitable means.

In some embodiments, extension sleeve 1020 may be integrally formed with housing 10. In this way, the interior of epitaxial sleeve 1020 is isolated from the external environment without sealing. However, it is contemplated that the extension sleeve 1020 may also be a separate piece and may be connected to the housing 10 by, for example, pressing in or welding.

It is contemplated that the extension sleeve 1020 may house a thermally conductive medium 1030 inside it for conducting heat from the fluid to be sensed to the temperature sensitive element 204, as shown in fig. 1. In this way, the sensitivity and accuracy of the temperature sensing element 204 to the sensing of the fluid temperature may be improved.

In the present disclosure, the use of the terms "first," "second," etc. are for descriptive purposes only and are not to be construed as limiting. Furthermore, while the present disclosure has been described with reference to exemplary embodiments, it is to be understood that the present disclosure is not limited to the specific embodiments described and illustrated herein. Various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope of the disclosure, which is defined by the claims of the present disclosure.

The features that are mentioned and/or shown in the above description of exemplary embodiments of the disclosure may be combined in the same or similar manner in one or more other embodiments in combination with or instead of the corresponding features of the other embodiments. Such combined or substituted solutions should also be considered to be included within the scope of the present disclosure.

Claims (10)

1. A pressure temperature sensor, comprising:

A housing provided with a first groove and a second groove separately arranged inside thereof, the first groove being provided with a first through hole communicating with the external environment, and a lower end of the second groove being closed; and

A base, a circuit board, a pressure sensitive element and a temperature sensitive element disposed in the housing, the pressure sensitive element and the temperature sensitive element each electrically connected to the circuit board, and the temperature sensitive element disposed in the second recess,

The base includes a body portion provided at an upper surface thereof with a third groove, and a first extension portion and a second extension portion extending downward from a lower surface of the body portion, the pressure sensitive element being sealingly arranged in the third groove by a first seal ring to form a sealed space between the pressure sensitive element and the third groove, the first extension portion being sealingly arranged in the first groove by a second seal ring and provided with a second through hole communicating with the sealed space and the first through hole, the second extension portion being arranged in the second groove, and a connection member for electrically connecting the temperature sensitive element with the circuit board being arranged on the second extension portion.

2. The pressure temperature sensor of claim 1, wherein the first and second extensions are disposed on either side of a centerline of the lower surface of the base.

3. A pressure temperature sensor according to claim 1 or 2, wherein the first seal ring is provided between a lower surface of the pressure sensitive element and a bottom surface of the third groove, and the second seal ring is provided between an outer peripheral surface of the first extension and an inner peripheral surface of the first groove.

4. A pressure and temperature sensor according to claim 1, wherein the connector is removably mounted on the base.

5. A pressure and temperature sensor according to claim 1, wherein the base is provided with a fourth recess on the outer surfaces of the body portion and the second elongate portion, the connector being seated in the fourth recess.

6. The pressure-temperature sensor according to claim 5, wherein a width of at least a portion of the opening of the fourth groove extending in the longitudinal direction thereof is smaller than a dimension of a portion of the connecting member corresponding to the at least a portion in the width direction of the opening.

7. A pressure and temperature sensor according to claim 1, wherein the housing is provided at a lower end thereof with a mounting portion for mounting the pressure and temperature sensor to an external pipe, a lower end orifice of the first through hole is located at a lower end face of the mounting portion, and the second groove extends downward beyond the lower end face of the mounting portion to form an extension sleeve, the temperature sensitive element being arranged within the extension sleeve.

8. A pressure and temperature sensor according to claim 7, wherein the extension sleeve is integrally formed with the housing.

9. The pressure temperature sensor of claim 7, wherein the extension sleeve houses a thermally conductive medium inside for conducting heat from the fluid to be sensed to the temperature sensitive element.

10. The pressure and temperature sensor of claim 1, wherein the housing comprises an upper housing and a lower housing, the upper housing and the lower housing being connected by a roll rivet.