A temperature pressure sensor

Abstract

A temperature pressure sensor capable of effectively fixing a temperature sensitive element, comprising: a housing defining a mounting cavity; a media interface downwardly disposed and connected to the housing, the interior of which defines a first media introduction passage and a second media introduction passage for introducing a media to be measured into the mounting cavity, at least the inner end of the first and second media introduction passages being disposed independently in the interior of the media interface; a pressure sensitive element communicating with the inner end of the second media introduction passage to obtain the pressure of the media to be measured; a temperature sensitive element disposed in the first media introduction passage; a resilient retaining member having side edges engaged to the inner wall of the first media introduction passage, at least the lower portion of which is independently provided with a passage space allowing the media to be measured to pass upwardly, or, a passage space allowing the media to be measured to pass is formed between at least the lower portion of the resilient retaining member and the first media introduction passage; and an electronic module assembly and the temperature sensitive element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensor, in particular to a temperature pressure sensor. BACKGROUND

[0002] Sensor devices that measure both temperature and pressure of a medium play a vital role in industrial control, medical devices and environmental monitoring. In these devices, the temperature sensitive element of the temperature pressure sensor is usually installed in a cylinder made of a good conductor, which is isolated from the medium to be measured; or the temperature sensitive element is directly extended into the pressure introduction channel and as close as possible to the outside end of the pressure introduction channel to minimize the adverse effects of temperature gradient. In this way, the temperature sensitive element needs to be connected to the electronic module assembly inside the sensor through a long pin. During assembly and use, the wire is not easy to be reliably fixed, and it is easy to cause cracks or damage between the pin of the temperature sensitive element (usually a thermistor) and the enclosure, resulting in failure of the temperature sensitive element; on the other hand, when measuring the pressure of the medium to be measured, excessive instantaneous pressure caused by pressure fluctuation has the risk of damaging the pressure sensitive element. SUMMARY

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

[0004] To achieve the above-mentioned purpose, the present application provides a temperature pressure sensor, which comprises:

[0005] a housing defining a mounting cavity;

[0006] a medium interface downwardly disposed and connected to the housing, the interior of which defines a first medium introduction channel and a second medium introduction channel for introducing the medium to be measured into the mounting cavity, at least the inner end of the first medium introduction channel and the second medium introduction channel is independently disposed in the interior of the medium interface;

[0007] a pressure sensitive element in communication with the inner end of the second medium introduction channel to obtain the pressure of the medium to be measured;

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

[0009] a resilient retaining member with a side edge joined to the inner wall of the first medium introduction channel, at least the lower part of which independently defines a passing space allowing the medium to be measured to pass upwardly, or the lower part of which and the first medium introduction channel both define a passing space allowing the medium to be measured to pass;

[0010] and an electronic module assembly disposed in the mounting cavity and electrically connected to the pressure sensitive element, the pins of the temperature sensitive element penetrating the elastic retaining member inwardly and electrically connected to the electronic module assembly.

[0011] Preferably, the second medium introduction channel shares a medium inlet with the first medium introduction channel.

[0012] Preferably, the medium inlet is upwardly directed to the first medium introduction channel.

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

[0014] Preferably, the elastic retaining member comprises a main body extending upwardly and downwardly, an outer wall of the main body forms a sealing rib, an outer edge of the sealing rib is fitted to an inner wall of the first medium introduction channel.

[0015] Preferably, the sealing rib comprises a plurality of annular sealing ribs arranged upwardly and downwardly; at least two upwardly and downwardly adjacent annular sealing ribs are provided with medium passing gaps or medium passing holes allowing the to-be-tested medium to pass upwardly, the medium passing gaps or the medium passing holes are respectively arranged on circumferentially opposite sides, and the passing space comprises spaces between the annular sealing ribs communicated by the medium passing gaps or the medium passing holes.

[0016] Preferably, the sealing rib comprises at least one helical sealing rib, and the passing space comprises a helical channel enclosed by the helical sealing rib and the first medium introduction channel.

[0017] Preferably, the elastic retaining member is made of foamed 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 to the inner wall of the first medium introduction channel on one side; a preventing part for preventing the elastic retaining member from being detached from the one side is formed in the first medium introduction channel, or the cross section of the first medium introduction channel is reduced toward the one side.

[0020] Compared with the prior art, the technical scheme of the present 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 the position. The temperature sensitive element is arranged in the lower part of the first medium introduction channel, preferably near the medium inlet, so as to reduce the influence of temperature gradient and obtain the temperature of the medium to be measured more accurately. Thus, the problems in the prior art that the lead wire is not easy to be reliably fixed and the crack or damage between the pin of the temperature sensitive element (usually a thermistor) and the package body is easy to occur during assembly and use, thereby causing the temperature sensitive element to fail, and the problem that the pressure sensitive element is damaged due to excessive instantaneous pressure caused by pressure fluctuation when measuring the pressure of the medium to be measured are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of a temperature pressure sensor of a first embodiment;

[0023] Figure 2 Structure diagram of a temperature pressure sensor of a second embodiment;

[0024] Figure 3 Structure diagram of a temperature pressure sensor of a third embodiment;

[0025] Figure 4 Structure diagram of a temperature pressure sensor of a fourth embodiment;

[0026] Figure 5 Structure diagram of a temperature pressure sensor of a fifth embodiment;

[0027] Reference signs: 10, mounting cavity; 111, first anti-disengagement piece; 112, communication part; 113a, crimping part; 113b, clearance hole; 113, second anti-disengagement piece; 11, main shell; 12, upper cover; 13a, terminal; 13, electrical connector; 1, shell; 20, pressure sensitive element; 21a, pressure via hole; 21, substrate; 22, electronic element; 23, frame; 24, protective gel; 25, processing chip; 26, first lead wire; 2, electronic module assembly; 31a, sealing body; 31, pin; 3, temperature sensitive element; 41, main body part; 421, notch; 423, partition cavity; 42, annular sealing rib; 43, helical sealing rib; 4, elastic retaining piece; 501, passing space; 511, medium inlet; 512, side opening; 51, first medium introduction channel; 52a, enlarged part; 52, second medium introduction channel; 54, helical channel; 5, medium interface; 6, sealing ring. DETAILED DESCRIPTION

[0028] For the purposes of this application, the application will now be described in more detail with reference to the drawings attached hereto. The embodiments of the application are shown in the drawings. However, the application can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described herein is oriented in an orientation that is opposite to the orientation shown in a particular figure, a spatially relative term that can have been used to describe a particular feature in connection with the particular figure will be understood to refer to that feature also in the opposite orientation. Thus, the exemplary term "under" can encompass both an orientation of above and below. The devices can also be oriented in the other orientations relative to the particular figure and the spatially relative terms used herein will be interpreted accordingly. Similarly, the exemplary term "below" can encompass both an orientation of above and below. The devices can also be oriented in the other orientations relative to the particular figure and the spatially relative terms used herein will be interpreted accordingly.

[0031] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described herein is oriented in an orientation that is opposite to the orientation shown in a particular figure, a spatially relative term that can have been used to describe a particular feature in connection with the particular figure will be understood to refer to that feature also in the opposite orientation. Thus, the exemplary term "under" can encompass both an orientation of above and below. The devices can also be oriented in the other orientations relative to the particular figure and the spatially relative terms used herein will be interpreted accordingly. Similarly, the exemplary term "below" can encompass both an orientation of above and below. The devices can also be oriented in the other orientations relative to the particular figure and the spatially relative terms used herein will be interpreted accordingly.

[0032] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "comprises" as used herein is not intended to exclude the presence of one or more additional features, integers, steps, operations, components, parts or combinations thereof, unless otherwise specified. Figure 1As shown, the temperature pressure sensor of the first embodiment comprises a housing 1 defining an installation cavity 10, which can include a main housing 11 and an upper cover 12 arranged on the upper end of the main housing 11. The temperature pressure sensor further comprises a medium interface 5 arranged downwardly and connected to the upper end of the main housing 11, and a sealing ring 6 can be sleeved on the outer wall of the medium interface 5. The medium interface 5 defines a first medium introduction channel 51 inside for introducing the medium to be measured into the installation cavity 10. The first medium introduction channel 51 can be a vertical hole with a medium inlet 511 at the outer end. The temperature pressure sensor further comprises a pressure sensitive element 20 and a temperature sensitive element 3. The pressure sensitive element 20 is connected to the inner side of the first medium introduction channel 51 for obtaining the pressure of the medium to be measured. The temperature sensitive element 3 is arranged in the first medium introduction channel 51 for obtaining the temperature of the medium to be measured. The temperature sensitive element 3 can be arranged in the lower part of the first medium introduction channel 51, preferably near the medium inlet 511, so as to reduce the influence of temperature gradient and obtain more accurate temperature of the medium to be measured.

[0033] The temperature pressure sensor further comprises an elastic retaining member 4 for retaining the temperature sensitive element 3 in the first medium introduction channel 51. The side edge of the elastic retaining member 4 is connected to the inner wall of the medium introduction channel, which can include a main body 41 extending upwardly and downwardly, and at least one annular sealing rib 42 arranged upwardly and downwardly on the outer wall of the main body 41. The outer edge of the annular sealing rib 42 is connected to the inner wall of the medium introduction channel. The above-mentioned annular sealing ribs 42 divide the first medium introduction channel 51 into at least one partition cavity 423 arranged upwardly and downwardly.

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

[0035] The elastic retaining member 4 and the inner wall of the first medium introduction channel 51 form a through space 501 allowing the medium to be measured to pass through. In this embodiment, a notch 421 can be arranged at the same angular position of the outer edge of each annular sealing rib 42. Thus, the medium to be measured introduced from the medium inlet 511 passes through the above-mentioned notches in sequence from outside to inside and is connected to the pressure sensitive element 20. In other schemes, additionally or alternatively, a medium passing hole (not shown) can be arranged on each annular sealing rib 42, or a medium passing hole can be arranged on the main body 41 to pass through upwardly and downwardly, so that the medium to be measured penetrates the elastic retaining member 4 upwardly and is connected to the pressure sensitive element 20 smoothly.

[0036] By way of example only, the electronic module assembly 2 can include a substrate 21, the lower side of which can be sealed to a mounting surface (not labeled) of the main housing 11 by adhesive sealing or pressure sealing. The substrate 21 can have a pressure through-hole 21a formed therein. The lower end of the pressure through-hole 21a is in communication with the first medium introduction passage 51, and the upper end is blocked by the pressure sensitive element 20. The electronic module assembly 2 further includes a processing circuit (not labeled) disposed on the upper side surface of the substrate 21. The processing circuit can include a processing chip 25 and other electronic components 22. The pressure sensitive element 20 and the processing chip 25 can be electrically connected to the processing circuit by bonding wires. The upper side surface of the substrate 21 can further have a surrounding frame 23 fixed thereon to surround the pressure sensitive element 20 and / or the processing chip 25, and the corresponding bonding wires (not labeled). The surrounding frame 23 can be filled with a protective gel 24 to protect the pressure sensitive element 20 and / or the processing chip 25, and the corresponding bonding wires. The processing circuit can be electrically connected to the inner side of one end of the plurality of terminals 13a by a plurality of first wires 26, respectively. The terminals 13a can be fixed to an electrical connector 13 connected by the side of the main housing 11, and the outer ends thereof can extend outwardly through the electrical connector 13 to be electrically connected to external devices.

[0037] The substrate 21 can be a ceramic plate, or an aluminum plate, etc. When the substrate 21 is a conductor, the processing circuit is disposed on the upper side surface of the substrate 21 in an insulating manner. The upper end of the pin 31 can be welded to the processing circuit after extending upwardly through a hole formed in the substrate 21, and the hole of the substrate 21 and the pin 31 can be reliably sealed by a sealing body 31a. The sealing body 31a can be preferably sintered glass. To avoid the temperature sensitive element 3, the lower portion of the first medium introduction passage 51 can be relatively enlarged to form an enlarged portion 52a.

[0038] The elastic retaining member 4 can be fixed to the inner wall of the first medium introduction passage 51 by a tight fit. Alternatively, the cross section of the first medium introduction passage 51 can be gradually reduced downwardly, for example, the first medium introduction passage 51 can be a conical hole with the tip of the cone downwardly directed, thereby preventing the elastic retaining member 4 from being pulled out downwardly. The upper end of the first medium introduction passage 51 can be formed by a first anti-extraction member 111 protruding radially inwardly from the side wall of the first medium introduction passage 51, and the first anti-extraction member 111 downwardly abuts against the elastic retaining member 4 to prevent the elastic retaining member 4 from being pulled out upwardly. To avoid the upper end of the pin 31, the pressure through-hole 21a can be disposed on the left and right sides of the upper end of the pin 31, and is in communication with the upper end of the first medium introduction passage 51 through a communication portion 112 formed by the enlarged upper end of the first medium introduction passage 51. In other embodiments, the first anti-extraction member 111 can also be omitted, and the substrate 21 can replace the first anti-extraction member 111 to press downwardly against the upper end of the main body portion 41.

[0039] Please refer to Figure 2The temperature pressure sensor of the second embodiment is similar to the first embodiment, but the cross section of the first medium introduction channel 51 is tapered upward, for example, the first medium introduction channel 51 can be a tapered hole with the top tapered upward, so as to prevent the elastic retaining member 4 from being pulled out upward. The lower end of the first medium introduction channel 51 can be provided with a second anti-extraction member 113 protruding radially inward from the side wall of the first medium introduction channel 51, and the second anti-extraction member 113 abuts against the elastic retaining member 4 upward to prevent the elastic retaining member 4 from being pulled out downward. In other embodiments, when the cross section of the portion of the first medium introduction channel 51 that cooperates with the elastic retaining member 4 is the same, the first anti-extraction member 111 and the second anti-extraction member 113 can be respectively provided at the upper and lower ends of the first medium introduction channel 51 to abut against the elastic retaining member 4 from the upper and lower sides.

[0040] In addition, the annular sealing ribs 42 described above are at least two. Their notches 421 (or medium passing holes) can be arranged in such a way that the medium passing notches 421 (or medium passing holes) provided on at least two adjacent annular sealing ribs 42 are respectively arranged on opposite sides in the circumferential direction, for example, from bottom to top, the notches 421 on the first annular sealing rib 42 can be arranged on the right side portion thereof, the notches 421 on the second annular sealing rib 42 can be arranged on the left side portion thereof, and so on. In this way, the medium to be measured can pass in a zigzag manner in the first medium introduction channel 51, which can protect the pressure sensitive element 20 from excessive instantaneous pressure and avoid damage to the pressure sensitive element 20.

[0041] Referring to Figure 3 The temperature pressure sensor of the third embodiment is similar to the second embodiment, but the sealing rib includes a helical sealing rib 43. The space 501 includes a helical channel 54 formed between the helical sealing rib 43 and the medium introduction channel. The pressure sensitive element 20 can pass through the pressure through hole 21a, the communication portion 112, and the helical channel 54 in sequence to communicate with the medium inlet 511.

[0042] Referring to Figure 4 The temperature pressure sensor of the fourth embodiment is similar to the third embodiment, but the radially outer end of the helical sealing rib 43 can be inclined away from the upper side relative to the radially side end, so as to facilitate the elastic retaining member to be inserted into the first medium introduction channel 51 from the medium inlet 511 upward. In other embodiments, when the first anti-extraction member 111 is present, the radially outer end of the helical sealing rib 43 can be inclined away from the lower side relative to the radially side end, so as to facilitate the elastic retaining member to be inserted into the first medium introduction channel 51 from the upper end of the first medium introduction channel 51 downward. When the cross section of the portion of the first medium introduction channel 51 that cooperates with the elastic retaining member 4 is the same, a similar effect can 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 communicated to the upper end of the second medium introduction channel 52. The second medium introduction channel 52 can independently extend 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 communicated to the lower portion 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 other schemes, the second medium introduction channel 52 can not share the 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] Referring to Figure 5 Compared with the fourth embodiment, the sealing rib of the elastic holder 4 of the fifth embodiment can include a plurality of annular sealing ribs 42 arranged in an up-down direction and a helical sealing rib 43. The annular sealing rib 42 can isolate the sealing body 31a from the medium to be measured, thereby reducing the sealing quality requirement of the sealing body 31a. In addition, a second medium introduction channel 52 is formed inside the medium interface 5. One end of the pressure through-hole 21a is communicated to the upper end of the second medium introduction channel 52. The second medium introduction channel 52 can independently extend 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 communicated to the upper end of the helical 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. The medium to be measured introduced from the medium inlet 511 is introduced into the second medium introduction channel 52 from the side opening 512 after being bent through the helical channel 54, thereby being coupled to the pressure sensitive element 20.

[0045] In addition, the second anti-extraction member 113 can also be arranged in another way inside the first medium introduction channel 51 of the main housing 11. For example, the second anti-extraction member 113 can be a cylindrical member which is threadedly connected or tightly fitted to the lower portion of the first medium introduction channel 51, and the inner side end (i.e. the upper end) of the second anti-extraction member 113 can extend horizontally to form a pressing portion 113a which is upwardly abutted to the elastic holder 4 (e.g. the main body portion 41). The pressing portion 113a is provided with a relief hole 113b for the temperature sensitive element 3 and the lead 31. Similarly, the first anti-extraction member 111 can also be fixedly arranged in the main housing 11.

[0046] In the above embodiments, the elastic holder 4 can be made of rubber or foamed material such as polyethylene, so that the medium to be measured which is compressed under pressure pulse can be absorbed by the up-down deformation absorbing portion, thereby protecting the pressure sensitive element 20.

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

[0048] The pressure sensitive element is connected to the inner end of the first medium introduction channel for obtaining the pressure of the medium to be measured. The temperature sensitive element is arranged in the first medium introduction channel for obtaining the temperature of the medium to be measured at the position. The temperature sensitive element is preferably arranged at the lower part of the first medium introduction channel, and more preferably arranged at the position close to the medium inlet of the first medium introduction channel, so as to reduce the influence of the temperature gradient and to more accurately measure the temperature of the medium to be measured. Thus, the problems that the wires are not reliably fixed in the prior art and the cracks or damages are easily caused between the pins of the temperature sensitive element (usually a thermistor) and the encapsulating body during the assembly and use, thereby causing the temperature sensitive element to fail, and the problem that the pressure sensitive element is damaged due to the excessive instantaneous pressure caused by the pressure fluctuation when measuring the pressure of the medium to be measured are effectively solved.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A temperature and pressure sensor, characterized in that, include: A housing (1) that defines a mounting cavity (10); A media interface (5) is disposed downward and connected to the housing (1), and its interior defines a first media inlet channel (51) and a second media inlet channel (52) for introducing the medium to be tested into the mounting cavity (10). At least one inner end of the first media inlet channel (51) and the second media inlet channel (52) are disposed relatively independently inside the media interface (5). A pressure-sensitive element (20) connected to one end of the inner side of the second medium inlet channel (52) to obtain the pressure of the medium to be measured; A temperature-sensitive element (3) is disposed within the first medium introduction channel (51). An elastic retainer (4) whose side edge is joined to the inner wall of the first medium introduction channel (51) has an independently provided passage space (501) on its lower part to allow the medium to be tested to pass upward, or its lower part and the first medium introduction channel (51) together form a passage space (501) to allow the medium to be tested to pass. An electronic module assembly (2) is disposed in the mounting cavity (10) and electrically connected to the pressure sensitive element (20), wherein the pin (31) of the temperature sensitive element (3) penetrates the elastic retainer (4) 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 inlet channel (52) shares a medium inlet (511) with the first medium inlet channel (51).

3. The temperature and pressure sensor according to claim 2, characterized in that, The medium inlet (511) faces upwards and is directly opposite 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 passage space (501).

5. The temperature and pressure sensor according to claim 1, characterized in that, The elastic retainer (4) includes a vertically extending main body (41), the outer wall of which 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 between the upper and lower parts; at least two adjacent annular sealing ribs (42) are provided with a medium passage notch (421) or a medium passage hole that allows the medium to be tested to pass upward, the medium passage notch (421) or the medium passage hole are respectively provided on opposite sides in the circumferential direction, and the passage space (501) includes the space between the plurality of annular sealing ribs (42) that are connected through the medium passage notch (421) or the medium passage hole.

7. The temperature and pressure sensor according to claim 5, characterized in that, The sealing rib includes at least one spiral sealing rib (43), and the passage space (501) includes a spiral channel (54) formed 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 retainer (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 retainer (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 retainer (4) is pressed against the inner wall of the first medium introduction channel (51) on the upper and lower side; an anti-detachment part is formed in the first medium introduction channel (51) to prevent the elastic retainer (4) from detaching on the said side, and / or the cross section of the first medium introduction channel (51) is reduced on the said side.

Images