Temperature pressure sensor

Abstract

A temperature pressure sensor capable of effectively fixing a temperature sensitive element comprises: a housing defining a mounting cavity; the medium interface is arranged downwards and is connected to the shell, a first medium introduction channel and a second medium introduction channel which are used for introducing a medium to be detected into the mounting cavity are defined in the medium interface, and at least one end of the inner side of the first medium introduction channel and one end of the inner side of the second medium introduction channel are relatively independently arranged in the medium interface; the pressure sensitive element is communicated with one end of the inner side of the second medium introduction channel so as to obtain the pressure of the medium to be measured; the temperature sensitive element is arranged in the first medium introduction channel, the side edge of the elastic retaining piece is connected to the inner wall of the first medium introduction channel, and at least the lower portion of the elastic retaining piece is independently provided with a passing space allowing a medium to be measured to pass upwards. At least the lower part of the first medium introducing channel and the first medium introducing channel enclose a passing space through which a to-be-detected medium passes; and an electronic module assembly and a temperature sensitive element.

Description

Technical Field

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

[0002] Sensor devices that simultaneously measure the temperature and pressure of a medium play a vital role in the fields of industrial control, medical equipment, and environmental monitoring. Among them, the temperature sensitive element of the temperature and pressure sensor is usually installed in a tube made of a good conductor that is isolated from the medium to be measured; or, the temperature sensitive element is directly extended and arranged in the pressure introduction channel, and as close as possible to the outer end of the pressure introduction channel to minimize the adverse effects of the temperature gradient. In this way, the temperature sensitive element needs to be connected to the electronic module assembly inside the sensor through a longer pin. During assembly and use, the wire is not easy to be reliably fixed, which can easily cause cracks or breakage between the pins of the temperature sensitive element (usually a thermistor) and the encapsulation, thereby causing the temperature sensitive element to fail; on the other hand, when measuring the pressure of the medium to be measured, the excessive instantaneous pressure caused by the pressure fluctuation has the risk of damaging the pressure sensitive element. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present application provides a temperature and pressure sensor to solve at least one of the above-mentioned defects.

[0004] To achieve the above objectives, the present application provides a temperature and pressure sensor, which includes:

[0005] a housing defining a mounting cavity;

[0006] A media interface disposed downward and connected to the housing, wherein a first media introduction channel and a second media introduction channel are defined inside the media interface for introducing the medium to be measured into the installation cavity, wherein at least one inner end of the first media introduction channel and the second media introduction channel is relatively independently disposed inside the media interface;

[0007] A pressure sensitive element connected to an inner end of the second medium introduction channel for obtaining the pressure of the medium to be measured;

[0008] a temperature sensitive element disposed in the first medium introduction channel,

[0009] An elastic retaining member whose side edge is joined to the inner wall of the first medium introduction channel, and at least a lower portion of the elastic retaining member is independently provided with a passage space allowing the medium to be measured to pass upward, or at least a lower portion of the elastic retaining member and the first medium introduction channel form a passage space allowing the medium to be measured to pass through;

[0010] and an electronic module assembly disposed in the installation cavity and electrically connected to the pressure sensitive element, wherein the pin of the temperature sensitive element penetrates the elastic retaining member toward the inside and is electrically connected to the electronic module assembly.

[0011] Preferably, the second medium introduction channel and the first medium introduction channel share a medium inlet.

[0012] Preferably, the medium inlet faces upwardly toward the first medium introduction channel.

[0013] Preferably, the second medium introduction channel is laterally connected to the upper end of the passage space.

[0014] Preferably, the elastic retaining member includes a main body portion extending up and down, the outer wall of the main body portion forms a sealing rib, and the outer edge of the sealing rib is attached to the inner wall of the first medium introduction channel.

[0015] Preferably, the sealing rib comprises a plurality of annular sealing ribs spaced apart from each other in the upper and lower directions; at least two of the annular sealing ribs adjacent to each other in the upper and lower directions are provided with medium-passing gaps or medium-passing holes for allowing the medium to be tested to pass upward; the medium-passing gaps or the medium-passing holes are respectively arranged on opposite sides of the circumference; and the passing space comprises the space between the plurality of annular sealing ribs connected through the medium-passing gaps or the medium-passing holes.

[0016] Preferably, the seal always includes at least one section of spiral sealing rib, and the passing space includes a section of spiral channel enclosed by the spiral sealing rib and the first medium introduction channel.

[0017] Preferably, the elastic retaining member is made of foam material or rubber.

[0018] Preferably, the elastic retaining member is tightly fitted to the inner wall of the first medium introduction channel.

[0019] Preferably, the elastic retaining member is pressed against the inner wall of the first medium introduction channel toward the upper and lower sides; an anti-slip portion is formed in the first medium introduction channel to prevent the elastic retaining member from slipping out toward the one side, and / or the cross-section of the first medium introduction channel is reduced toward the one side.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0021] The pressure sensitive element is connected to the inner end of the first medium introduction channel to obtain the pressure of the medium to be measured. The temperature sensitive element is arranged in the first medium introduction channel to obtain the temperature of the medium to be measured at that location. The temperature sensitive element is arranged at the lower part of the first medium introduction channel, preferably at the first medium introduction channel near the medium inlet, so as to reduce the influence of the temperature gradient and more accurately measure the temperature of the medium to be measured. Thus, the problem that the wire is not easy to be reliably fixed during the assembly and use of the prior art is effectively solved, which easily causes cracks or breakage between the pins of the temperature sensitive element (usually a thermistor) and the encapsulation, thereby causing the temperature sensitive element to fail; on the other hand, when measuring the pressure of the medium to be measured, the excessive instantaneous pressure caused by the pressure fluctuation has the risk of causing damage to the pressure sensitive element. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the temperature and pressure sensor of the first embodiment;

[0023] Figure 2 is a schematic structural diagram of a temperature and pressure sensor according to a second embodiment;

[0024] Figure 3 is a schematic structural diagram of a temperature and pressure sensor according to a third embodiment;

[0025] Figure 4 is a schematic structural diagram of a temperature and pressure sensor according to a fourth embodiment;

[0026] Figure 5 is a schematic structural diagram of a temperature and pressure sensor according to a fifth embodiment;

[0027] Description of reference numerals: 10, mounting cavity; 111, first anti-slip member; 112, connecting portion; 113a, crimping portion; 113b, clearance hole; 113, second anti-slip member; 11, main housing; 12, upper cover; 13a, terminal; 13, electrical connector; 1, housing; 20, pressure sensitive element; 21a, pressure via hole; 21, substrate; 22, electronic component; 23, frame; 24, protective gel; 25, processing chip; 26, first lead; 2, Electronic module assembly; 31a, sealing body; 31, pin; 3, temperature sensitive element; 41, main body; 421, notch; 423, partition cavity; 42, annular sealing rib; 43, spiral sealing rib; 4, elastic retaining member; 501, through space; 511, medium inlet; 512, side opening; 51, first medium introduction channel; 52a, expansion portion; 52, second medium introduction channel; 54, spiral channel; 5, medium interface; 6, sealing ring. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0031] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0032] When used herein, the singular forms "a", "an" and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, etc. Figure 1As shown, the temperature and pressure sensor of the first embodiment includes a housing 1 with an installation cavity 10 defined therein, and the housing 1 may include a main housing 11 and an upper cover 12 provided on the upper end of the main housing 11. The temperature and pressure sensor also includes a medium interface 5 disposed downward and connected to the main housing 11 at the upper end, and a sealing ring 6 may be sleeved on the outer wall of the medium interface 5. The interior of the medium interface 5 defines a first medium introduction channel 51 for introducing the medium to be measured into the installation cavity 10. The first medium introduction channel 51 may be a vertical hole having a medium inlet 511 at the outer end. The temperature and pressure sensor also includes a pressure sensitive element 20 and a temperature sensitive element 3. The pressure sensitive element 20 is connected to the inner end (the upper end in the figure) of the first medium introduction channel 51 for obtaining the pressure of the medium to be measured. The temperature sensitive element 3 is disposed in the first medium introduction channel 51 to obtain the temperature of the medium to be measured at that location. The temperature sensitive element 3 may be disposed at the lower portion of the first medium introduction channel 51, preferably at a position close to the medium inlet 511 of the first medium introduction channel 51, so as to reduce the influence of the temperature gradient and more accurately measure the temperature of the medium to be measured.

[0033] The temperature and pressure sensor also includes an elastic retainer 4 for retaining the temperature sensitive element 3 in the first medium introduction channel 51. The side edge of the elastic retainer 4 is joined to the inner wall of the medium introduction channel, and it may include a main body 41 extending up and down, and at least one annular sealing rib 42 formed on the outer wall of the main body 41 and arranged at intervals up and down. The outer edge of the annular sealing rib 42 is attached to the inner wall of the medium introduction channel. The above-mentioned multiple annular sealing ribs 42 separate the inside of the first medium introduction channel 51 into at least one partition cavity 423 separated up and down by the annular sealing rib 42.

[0034] The temperature and pressure sensor also includes an electronic module assembly 2 arranged in the installation cavity 10. The electronic module assembly 2 is electrically connected to the pressure sensitive element 20. The pin 31 of the temperature sensitive element 3 penetrates the above-mentioned elastic retaining member 4 inwardly and is electrically connected to the electronic module assembly 2.

[0035] Among them, the elastic retainer 4 and the inner wall of the first medium introduction channel 51 enclose a passage space 501 that allows the medium to be measured to pass through. In this embodiment, a notch 421 can be set at the same angular position in the circumferential direction of the outer edge of each annular sealing rib 42. As a result, the medium to be measured introduced by the medium inlet 511 passes through the above-mentioned notch from the outside to the inside in sequence and then connects to the pressure sensitive element 20. In some other schemes, additionally or alternatively, a medium passing hole (not shown) can be opened on each annular sealing rib 42, or a medium passing hole that runs through the main body 41 from top to bottom can be opened, so that the medium to be measured can pass through the elastic retainer 4 upwards and then smoothly connect to the pressure sensitive element 20.

[0036] For example only, the electronic module assembly 2 may include a substrate 21, the lower side of which may be sealed to a mounting surface (not marked) of the main housing 11 by adhesive sealing or pressure sealing. A pressure through hole 21a may be provided on the substrate 21. The lower end of the pressure through hole 21a is connected to the first medium introduction channel 51, and the upper end is blocked by the pressure sensitive element 20. The electronic module assembly 2 also includes a processing circuit (not marked) disposed on the upper surface of the substrate 21. The processing circuit may include a processing chip 25 and other electronic components 22. The pressure sensitive element 20 and the processing chip 25 may be electrically connected to the processing circuit via bonding wires. A frame 23 may also be fixed to the upper surface of the substrate 21 to surround the pressure sensitive element 20 and / or the processing chip 25, and corresponding bonding wires (not marked). The frame 23 may be filled with a protective gel 24 to protect the pressure sensitive element 20 and / or the processing chip 25, and corresponding bonding wires. Among them, the processing circuit may be electrically connected to the inner end of the plurality of terminals 13a correspondingly via a plurality of first leads 26. The terminal 13a may be fixed to an electrical connector 13 connected to the side of the main housing 11, and its outer end may pass outward through the electrical connector 13 to be electrically connected to an external device.

[0037] The substrate 21 may be a ceramic plate or an aluminum plate. When the substrate 21 is a conductor, the processing circuit is insulated and arranged on the upper surface of the substrate 21. The upper end of the pin 31 may pass upward through the hole arranged on the substrate 21 and then be welded to the processing circuit, and the pin 31 and the hole of the substrate 21 may be reliably sealed by the sealing body 31a. The sealing body 31a may preferably be sintered glass. In order to avoid the temperature sensitive element 3, the lower part of the first medium introduction channel 51 may be relatively enlarged to form an enlarged portion 52a.

[0038] Among them, the elastic retainer 4 can be fixed to the inner wall of the first medium introduction channel 51 by a tight fit. Alternatively, the cross-section of the first medium introduction channel 51 can be gradually reduced downward, for example, the first medium introduction channel 51 can be a tapered hole with the cone top facing downward, so as to prevent the elastic retainer 4 from falling out downward. The upper end of the first medium introduction channel 51 can be formed by a first anti-slip member 111 protruding radially inwardly from the side wall of the first medium introduction channel 51, and the first anti-slip member 111 abuts against the elastic retainer 4 downward to prevent the elastic retainer 4 from falling out upward. In order to avoid the upper end of the pin 31, the pressure through hole 21a can be arranged on the left and right sides of the upper end of the pin 31, and it is connected to the upper end of the first medium introduction channel 51 through a connecting portion 112 formed by expanding the upper end of the first medium introduction channel 51. In some other schemes, the first anti-slip member 111 can also be omitted, and the first anti-slip member 111 is replaced by the substrate 21 and crimped downward to the upper end of the main body 41.

[0039] See also Figure 2. Compared with the first embodiment, the cross-section of the first medium introduction channel 51 of the temperature and pressure sensor of the second embodiment gradually decreases upward. For example, the first medium introduction channel 51 can be a conical hole with the cone top facing upward, so as to prevent the elastic retaining member 4 from falling out upward. The lower end of the first medium introduction channel 51 can be formed by a second anti-slip member 113 that protrudes radially inwardly from the side wall of the first medium introduction channel 51. The second anti-slip member 113 abuts against the elastic retaining member 4 upward to prevent the elastic retaining member 4 from falling out downward. In some other schemes, when the cross-section of the first medium introduction channel 51 and the elastic retaining member 4 are the same, the first anti-slip member 111 and the second anti-slip member 113 can also be respectively provided at the upper and lower ends of the first medium introduction channel 51 to be low-connected to the elastic retaining member 4 from the upper and lower sides.

[0040] In addition, there are at least two annular sealing ribs 42. Their notches 421 (or medium passage holes) can be arranged in such a way that the medium passage notches 421 (or medium passage holes) provided on at least two upper and lower adjacent annular sealing ribs 42 are respectively provided on opposite sides of the circumference, for example, from bottom to top, the notch 421 on the first annular sealing rib 42 can be provided on its right side, the notch 421 on the second annular sealing rib 42 can be provided on its left side..., and so on. In this way, the medium to be measured can be transmitted in a tortuous manner in the first medium introduction channel 51, which can protect the pressure sensitive element 20 under pressure pulses and avoid damage to the pressure sensitive element 20 caused by excessive instantaneous pressure.

[0041] See also Figure 3 Compared with the second embodiment, the sealing rib of the temperature and pressure sensor of the third embodiment includes a spiral sealing rib 43. The through space 501 includes a spiral channel 54 formed between the spiral sealing rib 43 and the medium introduction channel. The pressure sensitive element 20 can be connected to the medium inlet 511 through the pressure through hole 21a, the connecting portion 112 and the spiral channel 54 in sequence.

[0042] See also Figure 4 . Compared with the temperature and pressure sensor of the third embodiment, the radially outer end of the spiral sealing rib 43 of the fourth embodiment can be tilted relative to the radial side end in a direction away from the upper side, so as to facilitate the elastic retaining member to be inserted upward from the medium inlet 511 into the first medium introduction channel 51. In some other schemes, when there is a first anti-slip member 111, the radially outer end of the spiral sealing rib 43 can be tilted relative to the radial side end in a direction away from the lower side, so as to facilitate the elastic retaining member to be inserted downward from the upper end of the first medium introduction channel 51 into the first medium introduction channel 51. Among them, when the first medium introduction channel 51 has the same partial cross-section as the elastic retaining member 4, a similar effect can also be achieved.

[0043] In addition, a second medium introduction channel 52 is formed inside the medium interface 5. One end of the pressure through hole 21a is connected to the upper end of the second medium introduction channel 52. The second medium introduction channel 52 can extend independently and in parallel with the first medium introduction channel 51 inside the medium interface 5. The lower end of the second medium introduction channel 52 is connected to the lower part of the first medium introduction channel 51 through a side opening 512. The first medium introduction channel 51 and the second medium introduction channel 52 can share a medium inlet 511, or in some other schemes, the second medium introduction channel 52 may not share a medium inlet 511 with the first medium introduction channel 51, for example, the lower end of the second medium introduction channel 52 can directly extend through to the lower end surface of the medium interface 5.

[0044] See also Figure 5 . Compared with the fourth embodiment, the sealing rib of the elastic retainer 4 of the fifth embodiment of the temperature and pressure sensor may include a plurality of annular sealing ribs 42 arranged at intervals up and down, and a section of spiral sealing ribs 43. Among them, the annular sealing ribs 42 can isolate the sealing body 31a from the medium to be measured, thereby reducing the sealing quality requirements of the sealing body 31a. On the other hand, a second medium introduction channel 52 is also formed inside the medium interface 5. One end of the pressure through hole 21a is connected to the upper end of the second medium introduction channel 52. The second medium introduction channel 52 can extend independently and in parallel with the first medium introduction channel 51 inside the medium interface 5. The lower end of the second medium introduction channel 52 is connected to the upper end of the spiral channel 54 through a side opening 512. The first medium introduction channel 51 and the second medium introduction channel 52 share a medium inlet 511. After the medium to be measured introduced from the medium inlet 511 passes through the above-mentioned spiral channel 54 in a tortuous manner, it enters the second medium introduction channel 52 from the side opening 512, thereby coupling to the pressure sensitive element 20.

[0045] In addition, the second anti-slip member 113 can also be arranged in the first medium introduction channel 51 of the main housing 11 in another way. For example, the second anti-slip member 113 can be cylindrical, which can be threaded or tightly fitted to the lower part of the first medium introduction channel 51, and its inner end (i.e., the upper end) can be horizontally extended to form a crimping portion 113a, and the crimping portion 113a is upwardly abutted against the elastic retaining member 4 (e.g., the main body 41). The crimping portion 113a is provided with a clearance hole 113b for giving way to the temperature sensitive element 3 and the pin 31. Similarly, the first anti-slip member 111 can also be fixed to the main housing 11 in combination.

[0046] In the above embodiments, the elastic retainer 4 may be made of rubber or foamed materials such as polyethylene, so that it can absorb part of the compressed medium to be measured by deforming up and down under pressure pulses, thereby protecting the pressure sensitive element 20.

[0047] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0048] The pressure sensitive element is connected to the inner end of the first medium introduction channel to obtain the pressure of the medium to be measured. The temperature sensitive element is arranged in the first medium introduction channel to obtain the temperature of the medium to be measured at that location. The temperature sensitive element is arranged at the lower part of the first medium introduction channel, preferably at the first medium introduction channel near the medium inlet, so as to reduce the influence of the temperature gradient and more accurately measure the temperature of the medium to be measured. Thus, the problem that the wire is not easy to be reliably fixed during the assembly and use of the prior art is effectively solved, which easily causes cracks or breakage between the pins of the temperature sensitive element (usually a thermistor) and the encapsulation, thereby causing the temperature sensitive element to fail; on the other hand, when measuring the pressure of the medium to be measured, the excessive instantaneous pressure caused by the pressure fluctuation has the risk of causing damage to the pressure sensitive element.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature and pressure sensor, characterized in that: include: A housing (1) defining a mounting cavity (10); A medium interface (5) disposed downward and connected to the housing (1), wherein a first medium introduction channel (51) and a second medium introduction channel (52) are defined inside the medium interface (5), for introducing the medium to be measured into the installation cavity (10); at least one inner end of the first medium introduction channel (51) and the second medium introduction channel (52) are relatively independently disposed inside the medium interface (5); A pressure sensitive element (20) connected to an inner end of the second medium introduction channel (52) for obtaining the pressure of the medium to be measured; a temperature sensitive element (3) disposed in the first medium introduction channel (51), An elastic retaining member (4) whose side edge is joined to the inner wall of the first medium introduction channel (51), and whose at least lower part is independently provided with a passing space (501) for allowing the medium to be measured to pass upward, or, whose at least lower part and the first medium introduction channel (51) form a passing space (501) for allowing the medium to be measured to pass through; and an electronic module assembly (2) disposed in the installation cavity (10) and electrically connected to the pressure sensitive element (20); a pin (31) of the temperature sensitive element (3) penetrates the elastic retaining member (4) toward the inside and is electrically connected to the electronic module assembly (2).

2. The temperature and pressure sensor according to claim 1, characterized in that: The second medium introduction channel (52) and the first medium introduction channel (51) share a medium inlet (511).

3. The temperature and pressure sensor according to claim 2, characterized in that: The medium inlet (511) faces upward and directly opposite to the first medium introduction channel (51).

4. The temperature and pressure sensor according to claim 2, characterized in that: The second medium introduction channel (52) is laterally connected to the upper end of the passing space (501).

5. The temperature and pressure sensor according to claim 1, characterized in that: The elastic retaining member (4) comprises a main body (41) extending up and down, the outer wall of the main body (41) forms a sealing rib, and the outer edge of the sealing rib is attached to the inner wall of the first medium introduction channel (51).

6. The temperature and pressure sensor according to claim 5, characterized in that: The sealing ribs include a plurality of annular sealing ribs (42) arranged at intervals in the upper and lower directions; at least two of the annular sealing ribs (42) adjacent to each other in the upper and lower directions are provided with medium-passing notches (421) or medium-passing holes for allowing the medium to be tested to pass upward; the medium-passing notches (421) or the medium-passing holes are respectively arranged on two opposite sides of the circumference; and the passing space (501) includes the space between the plurality of annular sealing ribs (42) connected through the medium-passing notches (421) or the medium-passing holes.

7. The temperature and pressure sensor according to claim 5, characterized in that: The seal comprises at least one section of spiral sealing rib (43), and the through space (501) comprises a section of spiral channel (54) enclosed between the spiral sealing rib (43) and the first medium introduction channel (51).

8. The temperature and pressure sensor according to claim 1, characterized in that: The elastic retaining member (4) is made of foam material or rubber.

9. The temperature and pressure sensor according to any one of claims 1 to 8, characterized in that: The elastic retaining member (4) is tightly fitted to the inner wall of the first medium introduction channel (51).

10. The temperature and pressure sensor according to any one of claims 1 to 8, characterized in that: The elastic retaining member (4) is pressed against the inner wall of the first medium introduction channel (51) toward the upper and lower sides; an anti-slip portion is formed in the first medium introduction channel (51) to prevent the elastic retaining member (4) from slipping out toward the one side, and / or the cross-section of the first medium introduction channel (51) is reduced toward the one side.

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