Buffer screw and pressure sensor using same

Abstract

The utility model discloses a buffer screw and a pressure sensor using the buffer screw, the buffer screw is a T-shaped structure, the bottom surface of the T-shaped structure is provided with a pressure inlet hole arranged along the axial direction of the buffer screw, the longitudinal part of the T-shaped structure is provided with a pressure dividing hole arranged along the radial direction of the buffer screw, and the pressure dividing hole is provided with a through hole. The tail end of the pressure inlet hole is communicated with the pressure dividing hole, and the aperture of the pressure inlet hole is smaller than that of the pressure dividing hole; the pressure sensor comprises a buffer screw, a filler neck, a pressure core body, a conversion circuit assembly, a support, a shell, a power supply circuit assembly, a rear cover, an electric connector and a signal processing circuit assembly. According to the buffer screw, the T-shaped structure is adopted, pressure is conveyed to the pressure core body from the two outlets of the T-shaped longitudinal part, irreversible damage to the pressure core body or a pressure sensing diaphragm of the pressure core body caused by sudden peak pressure is prevented, the pressure core body is protected, the reliability of a product is improved, and the buffer screw is simple in structure and convenient to use. Manufacturing, processing and mounting are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure sensing technical field, concretely speaking, a kind of buffer screw and the pressure sensor using the buffer screw of the utility model. BACKGROUND

[0002] The pressure sensor with screw type buffer device is based on traditional pressure sensor, and the reliability and service life of the sensor are improved by the added buffer structure. The screw type buffer structure can protect the sensitive elements inside the sensor from being damaged. This design solves the problem of the pressure sensor being easily damaged under impact and instantaneous high pressure. The sensor with this structure is widely used in industrial automation, aerospace, automobile manufacturing and other fields. The pressure sensor with screw type buffer device can meet the requirements of precision, stability and reliability of the sensor in these fields. However, at present, the structure of the pressure sensor with screw type buffer device is complex, which increases the manufacturing cost. Moreover, the pressure sensor with screw type buffer device on the market generally adopts standardized design, and lacks customized solutions for different application scenarios. SUMMARY

[0003] The utility model aims at the problems existing in prior art, provides a kind of buffer screw and the pressure sensor using the buffer screw of the utility model, to solve the defect that the pressure core or diaphragm is caused by the sudden peak pressure in the use process of sensor.

[0004] The utility model aims at the following technical scheme:

[0005] A kind of buffer screw, characterized in that: the buffer screw is T-shaped structure, and the bottom surface of T-shaped structure is opened along the axial direction of buffer screw The pressure inlet hole is opened on the longitudinal portion of T-shaped structure along the radial direction of buffer screw The pressure inlet hole is communicated with the pressure distribution hole, and the hole diameter of pressure inlet hole is less than the hole diameter of pressure distribution hole.

[0006] The pressure distribution hole penetrates the longitudinal portion of T-shaped structure, so that the buffer screw has an inlet on the inlet side of pressure inlet hole and two outlets on the outlet side of pressure distribution hole.

[0007] The ratio of the hole diameter of pressure inlet hole to the hole diameter of pressure distribution hole is 1:2-5.

[0008] The longitudinal portion of the buffer screw is provided with external threads, and the buffer screw is threadedly connected with the internal threads on the inner wall of the inlet side of the adapter nozzle mouth and welded at the joint.

[0009] When the buffer screw is installed on the inlet side of the adapter nozzle mouth, the pressure distribution hole region is located in the inner cavity of the adapter nozzle mouth.

[0010] The utility model provides a buffer screw's pressure sensor, its characterized in being: the pressure sensor includes buffer screw, connector nozzle, pressure core, conversion circuit assembly, support, shell, power supply circuit assembly, back cover, electric connector, signal processing circuit assembly, buffer screw installs in the pressure import end of connector nozzle, installs in the pressure cavity of connector nozzle with the output side of pressure core is inserted with conversion circuit assembly, the rear part of connector nozzle is fixed with the support of installing power supply circuit assembly and signal processing circuit assembly, the outside of support is covered with shell and the tail of shell is equipped with back cover, the back cover is opened with the embedded hole of inserting electric connector and with the front end of electric connector is installed on the support.

[0011] The pressure core adopts silicon piezoresistive pressure core, and the pressure core is sunk into the pressure cavity of the connector nozzle and welded at the gap.

[0012] The conversion circuit assembly is connected with the power supply circuit assembly by wires, the power supply circuit assembly is connected with the signal processing circuit assembly by wires, and the signal processing circuit assembly is connected with the electric connector by wires.

[0013] One end of the shell is laser welded on the connector nozzle boss on the outer circumferential side of the connector nozzle, the other end is laser welded on the back cover, and one end of the support is laser welded on the cavity boss arranged on the outer circumferential side of the pressure cavity of the connector nozzle.

[0014] The buffer screw and the connector nozzle are both made of L stainless steel material.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The buffer screw provided by the utility model is designed in a T-shaped structure, when an impact occurs, the bottom of the buffer screw first bears the impact, blocks the sharp peak pressure from directly acting on the diaphragm of the pressure core, and then transmits the pressure to the pressure core from the two outlets of the T-shaped longitudinal part, thereby reducing the impact of the sharp peak pressure on the pressure sensor, preventing irreversible damage to the pressure core or the pressure sensing diaphragm caused by sudden sharp peak pressure in use, greatly protecting the pressure core and improving the reliability of the product, and the structure is simple, convenient to manufacture, process and install.

[0017] The connector nozzle and the buffer screw of the pressure sensor provided by the utility model are both made of 316L stainless steel material, the same material is used to ensure good weldability, the material has good corrosion resistance and impact resistance, welding grooves are designed at both ends of the pressure cavity where the pressure core is placed, welding stress is effectively reduced, and welding strength is enhanced; the connector nozzle is provided with threads on the inner wall of the inlet side where the buffer screw is placed, the overall strength is ensured, and loosening does not occur during subsequent assembly and welding. BRIEF DESCRIPTION OF DRAWINGS

[0018] ATTACHMENTFigure 1 The structure schematic diagram of the buffer screw is provided in the utility model.

[0019] Attached Figure 2 The structure schematic diagram of the pressure sensor is provided in the utility model.

[0020] Among them: 1-buffer screw; 11-into pressure hole; 12-into pressure hole; 2-connector nozzle; 3-pressure core; 4-conversion circuit assembly; 5-bracket; 6-outer shell; 7-power circuit assembly; 8-back cover; 9-electric connector; 10-signal processing circuit assembly. DETAILED DESCRIPTION

[0021] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0022] The terms "one", "a", "the", "said", "s" are used to denote the presence of one or more elements / components / etc.; the terms "include" and "have" are used to indicate the inclusion of an open-ended integer and refer to the presence of additional elements / components / etc. in addition to the listed elements / components / etc.

[0023] As Figure 1 shown: a buffer screw, the buffer screw 1 is T-shaped structure, on the bottom surface of T-shaped structure is opened into pressure hole 11 along the axial direction of buffer screw 1, on the longitudinal part of T-shaped structure is opened into pressure hole 12 along the radial direction of buffer screw 1, the end of into pressure hole 11 communicates into pressure hole 12 and the hole diameter of into pressure hole 11 is less than the hole diameter of into pressure hole 12, one preferred range is: the ratio of the hole diameter of into pressure hole 11 and the hole diameter of into pressure hole 12 is 1:2~5. Since into pressure hole 12 penetrates the longitudinal part of T-shaped structure, the buffer screw 1 has an inlet on the inlet side of into pressure hole 11 and two outlets on the outlet side of into pressure hole 12; for easy installation, the longitudinal part of buffer screw 1 has external threads in the middle and lower part, and the buffer screw 1 is threadedly connected with internal threads on the inner wall of the inlet side of connector nozzle 2 through the external threads and is welded at the joint; when the buffer screw 1 is installed on the inlet side of connector nozzle 2, the area where into pressure hole 12 is located is in the inner cavity of connector nozzle 2.

[0024] When the impact comes, the bottom of the T-shaped buffer screw 1 first bears the impact, blocks the peak pressure directly acting on the diaphragm of the pressure core, and then transmits the pressure from the two outlets of the pressure distribution hole 12 of the T-shaped longitudinal part to the pressure core 3, thereby reducing the impact of the peak pressure on the pressure sensor, preventing the irreversible damage of the peak pressure suddenly appearing in the use process to the pressure core 3 or its pressure-sensitive diaphragm, greatly protecting the pressure core 3 and improving the reliability of the product, and the structure is simple, convenient to manufacture, process and install.

[0025] As shown in Figure 2 : a pressure sensor using a buffer screw, the pressure sensor comprising a buffer screw 1, a connector nozzle 2, a pressure core 3, a conversion circuit assembly 4, a bracket 5, a shell 6, a power supply circuit assembly 7, a rear cover 8, an electrical connector 9, a signal processing circuit assembly 10, the buffer screw 1 is installed at the pressure inlet end of the connector nozzle 2 and the buffer screw 1 and the connector nozzle 2 are made of 316L stainless steel material, the pressure core 3 is installed in the pressure sensing cavity of the connector nozzle 2, the output side of the pressure core 3 is inserted with the conversion circuit assembly 4, the rear part of the connector nozzle 2 is fixed with the bracket 5 which installs the power supply circuit assembly 7 and the signal processing circuit assembly 10, the outside of the bracket 5 is sleeved with the shell 6 and the tail part of the shell 6 is provided with the rear cover 8, the rear cover 8 is provided with an embedded hole for inserting the electrical connector 9 and the front end of the electrical connector 9 is installed on the bracket 5; the conversion circuit assembly 4 is connected with the power supply circuit assembly 7 through wires, the power supply circuit assembly 7 is connected with the signal processing circuit assembly 10 through wires, and the signal processing circuit assembly 10 is connected with the electrical connector 9 through wires.

[0026] The pressure core 3 described above adopts a silicon piezoresistive pressure core, the pressure core 3 is sunk in the pressure sensing cavity of the connector nozzle 2 and welded at the gap; one end of the shell 6 is laser welded on the connector nozzle boss on the outer circumferential side of the connector nozzle 2, and the other end is laser welded with the rear cover 8; one end of the bracket 5 is laser welded on the cavity boss arranged at the tail part of the outer circumferential side of the pressure sensing cavity of the connector nozzle 2.

[0027] When the pressure sensor with a buffer screw provided by this utility model is in use, the bottom of the T-shaped buffer screw 1 first bears the impact, preventing the peak pressure from directly acting on the pressure-sensing diaphragm of the pressure core 3. Then, the pressure is transmitted to the pressure core 3 from the two outlets of the pressure dividing hole 12 in the longitudinal part of the T-shape. The weak non-electrical pressure is transmitted to the surface of the pressure-sensing diaphragm of the pressure core 3 through the buffer screw 1, causing the pressure-sensing diaphragm to produce a micro-displacement proportional to the medium pressure. This displacement affects the electrical signal transmitted by the pressure core 3. The electrical signal is transmitted to the pin of the sintered base through the gold wire and output to the pressure core 3. The electrical signal reaches the conversion circuit assembly 4 and is transmitted to the power supply circuit assembly 7. The power supply circuit assembly 7 converts the electrical signal from the wire into a voltage signal or current signal that meets the requirements, and transmits it to the signal processing circuit assembly 10 through the wire. Then, the signal processing circuit assembly 10 compensates and amplifies the converted voltage signal or current signal, and outputs a voltage signal or current signal that meets the accuracy requirements through the electrical connector 9. Example

[0028] like Figure 2 The pressure sensor shown includes a buffer screw 1, a connector 2, a pressure core 3, a conversion circuit assembly 4, a bracket 5, a housing 6, a power circuit assembly 7, a back cover 8, an electrical connector 9, and a signal processing circuit assembly 10. The ratio of the diameter of the inlet hole 11 to the diameter of the pressure dividing hole 12 on the buffer screw 1 is 1:3. One end of the buffer screw 1 is externally designed with a thread for a more fitting fit at the pressure inlet end of the connector 2, and the joint is welded for fixation. Both the buffer screw 1 and the connector 2 are made of 316L stainless steel. A pressure core 3, which collects the pressure of the measured medium, is installed in the pressure-sensing cavity of the connector 2. The silicon piezoresistive pressure core 3 is recessed into the pressure-sensing cavity of the connector 2, and the gap is argon arc welded. A conversion circuit assembly 4 is inserted into the output side of the pressure core 3; a bracket 5 for mounting the power circuit assembly 7 and the signal processing circuit assembly 10 is fixed at the rear of the connector 2. The bracket 5 is mounted on the connector 2 by welding, and the power circuit assembly 7 and the signal processing assembly 10 are mounted on the bracket 5 by screws; the outer shell 6 is mounted on the connector 2 by laser welding, and the rear cover 8 is mounted on the outer shell 6 by laser welding. The electrical connector 9 is connected to the lead wire reserved on the signal processing assembly 10 and is mounted on the rear cover 8 by laser welding; the conversion circuit assembly 4 is connected to the power circuit assembly 7 by wires, the power circuit assembly 7 is connected to the signal processing circuit assembly 10 by wires, and the signal processing circuit assembly 10 is connected to the electrical connector 9 by wires.

[0029] The pressure sensor adopting the buffer screw provided by the utility model can be applied to a landing gear system.

[0030] The pressure sensor adopting the buffer screw provided by the utility model can be applied to an engine system.

[0031] The pressure sensor provided by the utility model uses the bottom of the T-shaped buffer screw 1 to first bear the impact, blocks the diaphragm of the pressure core 3 from the direct action of the peak pressure, and then transmits the pressure from the two outlets of the pressure distribution hole 12 of the T-shaped longitudinal part to the pressure core 3, thereby reducing the impact of the peak pressure on the pressure sensor, preventing the irreversible damage of the peak pressure suddenly appearing in the use process to the pressure core 3 or the pressure sensing diaphragm, greatly protecting the pressure core 3, improving the reliability of the product, and being simple in structure and convenient to manufacture, process and install.

[0032] In the embodiments of the utility model, the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0033] In the description of the embodiments of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the embodiments of the utility model.

[0034] In the description of the specification, the description of the terms "one embodiment", "one preferred embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the embodiments of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The above examples only illustrate the technical thought of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical scheme according to the technical thought of the present application falls into the protection scope of the present application. The technologies not involved in the present application can be realized by the prior art.

Claims

1. A cushioning screw, characterized by: The buffer screw (1) is T-shaped structure, and the T-shaped structure is provided with an inlet pressure hole (11) arranged along the axial direction of the buffer screw (1) on the bottom surface, and is provided with a pressure distribution hole (12) arranged along the radial direction of the buffer screw (1) on the longitudinal part of the T-shaped structure, and the end of the inlet pressure hole (11) is communicated with the pressure distribution hole (12), and the diameter of the inlet pressure hole (11) is smaller than that of the pressure distribution hole (12).

2. The cushioning screw of claim 1, wherein: The pressure distribution hole (12) penetrates the longitudinal part of the T-shaped structure, so that the buffer screw (1) has one inlet on the inlet side of the inlet pressure hole (11) and two outlets on the outlet side of the pressure distribution hole (12).

3. The cushioning screw of claim 1, wherein: The ratio of the diameter of the inlet pressure hole (11) to the diameter of the pressure distribution hole (12) is 1:2-5.

4. The cushioning screw of claim 1, wherein: The longitudinal part of the buffer screw (1) is provided with external threads, and the buffer screw (1) is threadedly connected with the internal threads on the inner wall of the inlet side of the adapter nozzle (2) through the external threads and is welded at the joint.

5. The cushioning screw of claim 1, wherein: When the buffer screw (1) is installed on the inlet side of the adapter nozzle (2), the pressure distribution hole (12) is located in the inner cavity of the adapter nozzle (2).

6. A pressure sensor employing the cushioning screw according to any one of claims 1 to 5, characterized in that: The pressure sensor comprises a buffer screw (1), an adapter nozzle (2), a pressure core (3), a conversion circuit assembly (4), a bracket (5), a shell (6), a power supply circuit assembly (7), a rear cover (8), an electrical connector (9), and a signal processing circuit assembly (10). The buffer screw (1) is installed on the pressure inlet end of the adapter nozzle (2), the pressure core (3) is installed in the pressure sensing cavity of the adapter nozzle (2), the output side of the pressure core (3) is connected with the conversion circuit assembly (4), the bracket (5) on which the power supply circuit assembly (7) and the signal processing circuit assembly (10) are installed is fixed to the rear part of the adapter nozzle (2), the shell (6) is sleeved on the outer surface of the bracket (5), the rear cover (8) is arranged at the tail of the shell (6), the rear cover (8) is provided with an embedding hole into which the electrical connector (9) is inserted, and the front end of the electrical connector (9) is installed on the bracket (5).

7. The pressure sensor of claim 6, wherein: The pressure core (3) is a silicon piezoresistive pressure core, and the pressure core (3) is sunk into the pressure sensing cavity of the adapter nozzle (2) and is welded at the gap.

8. The pressure sensor of claim 6, wherein: The conversion circuit assembly (4) is connected with the power supply circuit assembly (7) through wires, the power supply circuit assembly (7) is connected with the signal processing circuit assembly (10) through wires, and the signal processing circuit assembly (10) is connected with the electrical connector (9) through wires.

9. The pressure sensor of claim 6, wherein: One end of the shell (6) is laser welded on the adapter nozzle boss on the outer circumferential side of the adapter nozzle (2), the other end is laser welded on the rear cover (8), one end of the bracket (5) is laser welded on the cavity boss arranged on the outer circumferential side of the pressure sensing cavity of the adapter nozzle (2).

10. The pressure sensor of claim 6, wherein: The buffer screw (1) and the adapter nozzle (2) are both made of 316L stainless steel.

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