Temperature pressure sensor

Abstract

A temperature pressure sensor which is simple in structure and relatively high in assembly efficiency comprises a shell which is provided with a to-be-measured medium introduction pipe which is used for introducing a to-be-measured medium into the shell and extends longitudinally, and a plurality of terminals which penetrate through the shell from inside to outside are fixed on the to-be-measured medium introduction pipe; the electronic module assembly is arranged in the shell and comprises a processing circuit electrically connected to one end of the inner side of the terminal and a substrate extending transversely, and the surface of one side of the substrate is fixed and sealed to one end of the inner side of the to-be-detected medium introduction pipe through a sealant; the pressure sensitive element is fixed on the surface of one side of the substrate, is coupled to the medium to be measured and is electrically connected to the processing circuit; wires at the two ends of the temperature sensitive element extend to the lower part of one side, facing the to-be-measured medium introduction pipe, of the substrate, penetrate through the sealant and then are electrically connected to one ends of the inner sides of the two terminals; the holding element is used for holding the temperature sensitive element in the to-be-measured medium introduction pipe, and a gap allowing the to-be-measured medium to pass through internally and externally is reserved between the outer wall of the holding element and the inner wall of the pressure medium introduction pipe.

Description

Technical Field

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

[0002] In a temperature and pressure sensor, it is necessary to arrange temperature-sensitive elements inside a pressure introduction pipe. These temperature-sensitive elements are usually NTC resistors, and thin wires are provided at both ends thereof. These wires need to be hermetically electrically connected to a circuit board provided inside the sensor. Generally, the method is to sinter pins through glass frit on a ceramic or metal substrate to hermetically feed through and connect to the circuit on the upper side of the substrate, and then solder the leads of the temperature-sensitive elements to the lower ends of the pins. This method requires complex metallization treatment of the through-holes of the substrate and sintering of the glass frit at high temperature. On the other hand, the shape of the wires of the temperature-sensitive elements is likely to change during assembly. Therefore, manual intervention is usually required to correctly connect the leads to the pins. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present application provides a temperature and pressure sensor to simplify the structure and improve the assembly efficiency.

[0004] To achieve the above object, the present application provides the following technical solution: A temperature and pressure sensor, comprising:

[0005] A housing having a longitudinally extending measured medium introduction pipe for introducing a measured medium into the interior of the housing, and a plurality of terminals passing through the housing both inside and outside are fixed thereto;

[0006] An electronic module assembly disposed inside the housing, including a processing circuit electrically connected to an inner end of the terminal and a laterally extending substrate, and one side surface of the substrate is fixed and sealed to an inner end of the measured medium introduction pipe through a sealant;

[0007] A pressure-sensitive element fixed to one side surface of the substrate, which is coupled to the measured medium and electrically connected to the processing circuit;

[0008] A temperature-sensitive element disposed inside the measured medium introduction pipe, and wires at both ends thereof extend to a lower side of one side of the substrate facing the measured medium introduction pipe and pass through the sealant and are electrically connected to inner ends of two of the terminals in a one-to-one correspondence;

[0009] And a holding element for holding the temperature-sensitive element inside the measured medium introduction pipe, and a gap allowing the measured medium to pass through inside and outside is left between an outer wall thereof and an inner wall of the pressure medium introduction pipe.

[0010] Preferably, the holding element includes a first half-shell portion and a second half-shell portion that are combined to form two holding holes for correspondingly accommodating at least a portion of the two wires.

[0011] Preferably, the wire includes a first portion located inside the tube for introducing the medium to be measured, and the holding hole includes a vertically extending vertical guiding hole that is substantially longitudinally extended and surrounded by the second half-shell portion and the first half-shell portion from opposite lateral sides.

[0012] Preferably, a groove corresponding to defining at least a portion of the two vertical guiding holes is formed inside the first half-shell portion, and the lower end of the partition wall between the two grooves of the first half-shell portion is in a flaky shape.

[0013] Preferably, the lateral cross-section of the vertical guiding hole gradually decreases from bottom to top.

[0014] Preferably, the upper end of the first half-shell portion extends horizontally to form a first horizontally extending portion, the upper end of the second half-shell portion extends horizontally to form a second horizontally extending portion, and the holding hole further includes a horizontal guiding hole surrounded by the upper and lower combination of the first horizontally extending portion and the second horizontally extending portion; the wire further includes a second portion held in the horizontal guiding hole.

[0015] Preferably, the wire further includes a third portion connected to the second portion and extending horizontally, and one ends of the two third portions are away from each other in the lateral plane.

[0016] Preferably, a receiving groove for accommodating the third portion is provided inside the housing.

[0017] Preferably, the middle width of the receiving groove is relatively expanded to form an enlarged portion.

[0018] Preferably, the surface of the inner end of the tube for introducing the medium to be measured is recessed downward to form a cavity communicating with the receiving groove, and a surrounding flange is formed by the inner edges of the tube for introducing the medium to be measured to separate the inside of the tube for introducing the medium to be measured from the cavity. Description of the Drawings

[0019] Figure 1 Schematic structural diagram of the temperature and pressure sensor of the preferred embodiment;

[0020] Figure 2 Top view of the temperature and pressure sensor of the preferred embodiment;

[0021] Figure 3 Three-dimensional view of the temperature and pressure sensor of the preferred embodiment;

[0022] Figure 4Partial structural schematic diagram of the temperature and pressure sensor of the preferred embodiment;

[0023] Figure 5 Stereogram of the first half-shell part of the preferred embodiment;

[0024] Description of reference numerals: 111, flange; 114, sealing ring; 115, sealing ring; 11a, inner wall; 11, introduction pipe for the medium to be measured; 12, electrical connector; 1a, receiving groove; 1b, receiving groove; 1c, enlarged part; 1d, partition groove; 1, main housing; 21, partition rib; 2, upper cover; 41, lead wire; 4, pressure-sensitive element; 41, substrate; 42, frame; 43, lead wire; 61a, first horizontally extending part; 61, first half-shell part; 62b, second horizontally extending part; 62, second half-shell part; 63, temperature-sensitive element; 631, first part; 632, second part; 633, third part; 63, wire; 6a, vertical guiding hole; 6b, horizontal guiding hole; 6, holding element; 7a, inner end; 7b, inner end; 7, terminal. Detailed implementation manners

[0025] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are exemplary and are only used to explain the present application, and cannot be construed as a limitation to the present application. In the following description, the same reference numerals are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the prefixes "first", "second", "third", etc. are only used for the purpose of distinguishing the modified objects, and cannot be construed as indicating or implying relative importance.

[0027] In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] It should be further understood that the term "and / or" used in the specification and the corresponding claims of the present application refers to any combination of one or more of the listed items and all possible combinations.

[0029] As Figures 1 to 5 shown, in a preferred embodiment of the present application, the temperature and pressure sensor includes a housing (not labeled), a pressure-sensitive element 4, an electronic module assembly (not labeled), and a temperature-sensitive element 63 disposed inside the housing. Among them, the housing may include a main housing 1 having an upward-facing cavity and an upper cover 2 covering the cavity. The main housing 1 and the upper cover 2 together enclose the inner cavity of the housing. A medium-to-be-measured introduction pipe 11 extending longitudinally up and down may be provided at the lower part of the main housing 1 to introduce the medium to be measured into the housing interior. An electrical plug-in part 12 may be provided on the side of the main housing 1. A plurality of terminals 7 are fixed on the electrical plug-in part 12. The inner ends of the terminals 7 extend into the housing interior, and the outer ends of the terminals 7 extend to the outside of the sensor to be connected to external devices.

[0030] The electronic module assembly may include a laterally extending substrate 41 and a processing circuit (not labeled) electrically connected to the inner ends of the terminals 7. The processing circuit may be disposed on the upper side surface of the substrate 41. The lower side surface of the substrate 41 is fixed and sealed to the inner end of the medium-to-be-measured introduction pipe 11 through a sealant. The pressure-sensitive element 4 may be fixed on the upper side surface of the substrate 41. It may be coupled to the medium to be measured in the inner cavity of the medium-to-be-measured introduction pipe 11 through a pressure through-hole penetrating the substrate 41 up and down. The pressure-sensitive element 4 is electrically connected to the processing circuit through a lead 41. Optionally, a sealing ring 114 and / or a sealing ring 115 may be provided on the outer wall of the medium introduction pipe 11.

[0031] Among them, the temperature-sensitive element 63 is disposed inside the medium-to-be-measured introduction pipe 11. The wires 63 at both ends thereof extend to the lower side of the substrate 41 facing the medium-to-be-measured introduction pipe 11 and pass through the sealant (not shown) and are electrically connected to the inner ends of two of the terminals 7 in a one-to-one correspondence.

[0032] The temperature and pressure sensor of the present application further includes a holding element 6 for holding the temperature-sensitive element 63 inside the medium-to-be-measured introduction pipe 11. A gap allowing the medium to pass in and out is left between the outer wall of the holding element 6 and the inner wall 11a of the pressure medium introduction pipe 11.

[0033] Preferably, the holding element 6 may include a first half-shell portion 61 and a second half-shell portion 62 that are combined to form at least a part of two holding holes for correspondingly accommodating at least a part of the two wires 63. The wire 63 includes a first portion 631 located inside the medium-to-be-measured introduction pipe 11. The holding hole at least includes a generally longitudinally extending vertical guiding hole 6a surrounded by the second half-shell portion 62 and the first half-shell portion 61 from opposite lateral sides.

[0034] Preferably, a groove corresponding to and defining at least a part of the two vertical guide holes 6a is formed inside the first half shell portion 61. The lower end of the partition wall 61 between the two grooves in the first half shell portion 61 is in the shape of a thin sheet. In this way, the wire 63 can be first assembled to the second half shell portion 62, and then the first half shell portion 61 can be horizontally combined to the first half shell portion 61. During the combination process of the first half shell portion 61 and the second half shell portion 62, the thin sheet-like lower part of the partition wall 61 first extends into the space between the two wires 63 from the lower end of the wire 63 and gradually separates the two wires 63, and respectively guides the lower side portions of the wires 63 to be placed in the corresponding vertical guide holes 6a. Preferably, for facilitating the guiding of the wire 63, the horizontal cross section of the vertical guide hole 6a gradually decreases from bottom to top.

[0035] Preferably, the upper end of the first half shell portion 61 extends horizontally to form a first horizontally extending portion 61a. The upper end of the second half shell portion 62 extends horizontally to form a second horizontally extending portion 62b. The holding hole further includes a horizontal guide hole 6b formed by the upper and lower combination of the first horizontally extending portion 61a and the second horizontally extending portion 62b. The wire 63 further includes a second portion 632 held in the horizontal guide hole 6b.

[0036] Preferably, the wire 63 further includes a third portion 633 connected to the second portion 632 and extending horizontally. The inner ends of the two third portions 633 are away from each other in the horizontal plane.

[0037] Correspondingly, accommodation grooves 1a, 1b for accommodating the third portion 633 are provided inside the housing. For example, the accommodation grooves 1a, 1b can be arranged in a V shape. Correspondingly, the two horizontal guide holes 6b and the accommodation grooves 1a, 1b are in one-to-one correspondence and collinearly arranged, that is, one end of the accommodation grooves 1a, 1b is directly pointed at the outlet of a horizontal guide hole 6b. In this way, after the holding element 6 is assembled to hold the first portion 631, the portion of it outside the holding hole is greatly reduced relative to the original total length, thereby improving the stiffness, so that it can be more conveniently assembled into the corresponding accommodation grooves 1a, 2b. Preferably, in order to improve the bonding force between the sealant and the main housing 1 and the substrate 41, the middle width of the accommodation grooves 1a, 1b is relatively expanded to form an enlarged portion 1c.

[0038] In addition, the surface of the inner end of the medium to be measured introduction pipe 11 is recessed downward to form a cavity communicating with the accommodation grooves 1a, 1b. The inner edges of the medium to be measured introduction pipe 11 relatively form a ring-shaped flange 111 for separating the inside of the medium to be measured introduction pipe 11 from the cavity, so as to prevent the sealant from overflowing into the inner cavity of the medium to be measured introduction pipe 11.

[0039] Among them, the upper cover 2 extends downward to form a partition rib 21. A partition groove 1d communicating with the accommodation groove 1a and / or the accommodation groove 1b can be correspondingly formed on the main housing 1. The partition rib 21 extends into the above-mentioned partition groove 1d and forms a seal with the main housing 1 through the above-mentioned sealant, so as to horizontally partition the inner cavity of the housing above the substrate 41 into two sub-cavities, so that some electronic components are arranged in a sub-cavity far from the medium to be measured, so as to improve their corrosion resistance.

[0040] Among them, the inner end of the wire 63, that is, the third part 633, can be electrically connected to the inner ends 7a of two of the terminals 7, and the processing circuit on the upper surface of the substrate 41 is electrically connected to the inner ends 7b of a plurality of terminals 7 through leads 43. A surrounding frame 42 surrounding the pressure-sensitive element 4 can also be fixed on the upper surface of the substrate 41, and a protective gel covering the pressure-sensitive element 4 and the lead 41 is filled in the surrounding frame 42.

[0041] The scope of the present disclosure is not limited by the detailed description, but is limited by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are construed as being included in the present disclosure.

Claims

1. A temperature and pressure sensor, characterized in that, Comprising: A housing having a longitudinally extending measuring medium inlet pipe (11) for introducing a measuring medium to be measured into the interior of the housing, on which a plurality of terminals (7) passing through the housing both inside and outside are fixed; An electronic module assembly disposed inside the housing, including a processing circuit electrically connected to an inner end of the terminal (7) and a laterally extending substrate (41), one side surface of the substrate (41) being fixed and sealed to an inner end of the measuring medium inlet pipe (11) by a sealant; A pressure sensitive element (4) fixed to one side surface of the substrate (41), which is coupled to the measuring medium and electrically connected to the processing circuit; A temperature sensitive element (63) disposed inside the measuring medium inlet pipe (11), wires (63) at both ends of which extend to a lower side of one side of the substrate (41) facing the measuring medium inlet pipe (11) and pass through the sealant and are electrically connected to inner ends of two of the terminals (7) in a one-to-one correspondence; And a holding element (6) for holding the temperature sensitive element (63) inside the measuring medium inlet pipe (11), with a gap allowing the measuring medium to pass through inside and outside left between an outer wall of the holding element (6) and an inner wall of the pressure medium inlet pipe (11).

2. The temperature and pressure sensor according to claim 1, characterized in that, The holding element (6) includes a first half-shell part (61) and a second half-shell part (62) that are combined to form at least a part of two holding holes for correspondingly accommodating at least a part of the two wires (63).

3. The temperature and pressure sensor according to claim 2, characterized in that The wire (63) includes a first part (631) located inside the measuring medium inlet pipe (11), and the holding hole includes a generally longitudinally extending vertical guiding hole (6a) surrounded by the second half-shell part (62) and the first half-shell part (61) from opposite lateral sides.

4. The temperature and pressure sensor according to claim 3, wherein A groove corresponding to define at least a part of the two vertical guiding holes (6a) is formed inside the first half-shell part (61), and a lower end of a partition wall (61) of the first half-shell part (61) located between the two grooves is in the shape of a thin sheet.

5. The temperature and pressure sensor according to claim 3, characterized in that A lateral cross-section of the vertical guiding hole (6a) gradually decreases from bottom to top.

6. The temperature and pressure sensor according to any one of claims 3 to 4, characterized in that, An upper end of the first half-shell part (61) extends laterally to form a first horizontally extending part (61a), an upper end of the second half-shell part (62) extends laterally to form a second horizontally extending part (62b), and the holding hole further includes a horizontal guiding hole (6b) surrounded by the upper and lower combination of the first horizontally extending part (61a) and the second horizontally extending part (62b); the wire (63) further includes a second part (632) held in the horizontal guiding hole (6b).

7. The temperature and pressure sensor according to claim 6, characterized in that, The wire (63) further includes a third part (633) connected to the second part (632) and extending laterally, and inner ends of the two third parts (633) are away from each other in a lateral plane.

8. The temperature and pressure sensor according to claim 7, characterized in that An accommodating groove (1a, 1b) for accommodating the third part (633) is provided inside the housing.

9. The temperature and pressure sensor according to claim 8, characterized in that, A middle width of the accommodating groove (1a, 1b) is relatively expanded to form an enlarged part (1c).

10. The temperature and pressure sensor according to claim 8, characterized in that, The surface of one inner end of the medium introduction tube (11) to be tested is recessed downward to form a concave cavity connected to the containing groove (1a, 1b), and the inner edge of the medium introduction tube (11) to be tested forms a retaining edge (111) that separates the interior of the medium introduction tube (11) to be tested from the concave cavity.

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