CN221198752U

CN221198752U - Pressure-capacity type water pressure sensor

Info

Publication number: CN221198752U
Application number: CN202322678858.0U
Authority: CN
Inventors: 陈鸿; 陈华强; 张振功
Original assignee: Zhejiang Huadi Electronic Co ltd
Current assignee: Zhejiang Huadi Electronic Co ltd
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-06-21
Anticipated expiration: 2033-10-07

Abstract

The utility model discloses a pressure-capacity type water pressure sensor, which comprises a shell formed by combining a fixed seat and a connector seat, wherein a ceramic sensor and a circuit board are arranged in the shell, a shielding sheet is arranged between the ceramic sensor and a water inlet hole on the connector seat, the shielding sheet comprises a copper foil and a protective layer, the copper foil is adhered to the surface of the ceramic sensor, a bent pin is arranged at the outer edge of the copper foil, and the pin is connected with a power supply negative electrode of the ceramic sensor; the protective layer is disposed on the outer surface of the copper foil. According to the utility model, the protective layer is arranged on the outer surface of the copper foil of the shielding sheet, the copper foil can shield the influence of parasitic capacitance generated by conductive liquid such as water and the like on the ceramic sensor, the measurement accuracy is improved, the protective layer can protect the copper foil from corrosion and oxidation, and the service life is prolonged. The copper foil is connected with the power supply cathode of the ceramic sensor through the pin, so that the anti-interference capability is further improved.

Description

Pressure-capacity type water pressure sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a pressure-capacity type water pressure sensor.

Background

The ceramic capacitive pressure sensor adopts ceramic materials as detection elements, has better stability and reliability in severe environments such as high temperature, high humidity, corrosion and the like, and is widely applied to control systems of various industrial equipment and household appliances.

The output signal is greatly deviated due to parasitic capacitance of the conductive liquid such as water. Therefore, the ceramic capacitive pressure sensor is inaccurate in pressure measurement accuracy for conductive liquid such as water.

In order to overcome the above-mentioned drawbacks, chinese patent No. CN 115560885A discloses a ceramic capacitive pressure sensor, in which the pressure sensing element includes a substrate and a sheet which are fixed together, a first electrode is disposed on a side of the substrate close to the sheet, a second electrode is disposed on a side of the sheet close to the substrate, and a layer of electrode is printed on a contact medium surface outside the sheet, so as to form an electrode shielding layer, which can eliminate the influence of parasitic capacitance of conductive liquid such as water, and improve the test accuracy. This solution has the following problems:

firstly, an electrode shielding layer is formed in a printing mode, so that on one hand, the process is complex, and the cost is high; on the other hand, the utility model is easy to fall off, and the service life is reduced.

Secondly, the electrode shielding layer is contacted with water for a long time, impurities in the water can be deposited on the surface of the electrode shielding layer, and the surface of the electrode shielding layer is easy to oxidize, so that inaccurate testing precision is caused.

In view of this, improvements to existing pressure-capacitance type water pressure sensors are needed to simplify the process and improve the test accuracy.

Disclosure of utility model

Aiming at the defects, the utility model aims to provide the pressure-capacity type water pressure sensor to solve the problems of complex manufacturing process, high cost and inaccurate testing precision of the traditional pressure-capacity type water pressure sensor.

The utility model provides a pressure-capacity type water pressure sensor, which comprises a shell formed by combining a fixed seat and a joint seat, wherein a ceramic sensor and a circuit board connected with the ceramic sensor are arranged in the shell, a shielding sheet is arranged between the ceramic sensor and a water inlet hole on the joint seat, and the shielding sheet comprises:

Copper foil is adhered to the surface of the ceramic sensor facing to one side of the water inlet hole on the joint seat, a bent pin is arranged at the outer edge of the copper foil, and the pin is connected with the power supply negative electrode of the ceramic sensor;

And a protective layer disposed on an outer surface of the copper foil.

In the above technical solution, preferably, the fixing base includes a plug, the other end of the plug is provided with a plugboard, and two side walls of the plugboard are respectively provided with a sliding rail;

The connector seat comprises a lower wall and three surrounding side walls, connectors are arranged on the outer surface of the lower wall, sliding grooves are respectively arranged on the inner side surfaces of the two opposite side walls, and the sliding grooves are matched with the sliding rails.

In the above technical solution, preferably, the end of the board is provided with a bump, the bump is provided with a card hole, a slot is provided on a side wall of the connector base opposite to the bump, a hook is provided in the slot, the slide rail is inserted along the slide slot, the bump is inserted into the slot, and the hook is clamped in the card hole.

In the above technical solution, preferably, the sliding rail may have a wedge structure, and the thickness of the junction surface of the sliding rail gradually increases from the end to the root.

In the above technical solution, preferably, the joint is provided with a first annular groove, and a first sealing ring is disposed in the first annular groove.

In the above technical solution, preferably, a second annular groove is provided on the inner surface of the lower wall around the water inlet, and a second sealing ring is provided in the second annular groove.

In the above technical solution, preferably, the copper foil is in a shape of a circular sheet.

In the above technical solution, preferably, the protective layer is made of teflon film material and coated on the outer side surface of the copper foil.

In the above technical solution, preferably, a surface of the hook opposite to the bump is an inclined surface or an arc surface.

In the above technical solution, preferably, a sealing plate is provided at the root of the plug, and covers the notch on the connector base.

According to the technical scheme, the pressure-capacity type water pressure sensor provided by the utility model solves the problems of high cost and inaccurate testing precision in the prior art. Compared with the prior art, the utility model has the following beneficial effects:

The shielding sheet is adhered to the outer surface of the ceramic sensor, the shielding sheet comprises a copper foil and a protective layer arranged on the outer surface of the copper foil, the copper foil can shield the influence of parasitic capacitance generated by conductive liquid such as water and the like on the ceramic sensor, the measurement accuracy is improved, the protective layer can protect the copper foil from corrosion and oxidation, and the service life is prolonged. The outer fringe of copper foil is equipped with the pin of buckling, and the pin is connected with ceramic sensor's power negative pole, has further improved interference killing feature.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will make brief description and illustrations of the drawings used in the description of the embodiments of the present utility model or the prior art. It is obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a pressure-tolerant water pressure sensor provided by the utility model;

FIG. 2 is a cross-sectional view of the pressure-tolerant water pressure sensor shown in FIG. 1;

FIG. 3 is an exploded view of the pressure-tolerant water pressure sensor of FIG. 1;

FIG. 4 is a schematic view of a fixing base according to the present utility model;

FIG. 5 is a schematic view of the fixing base of FIG. 4 in a bottom view;

FIG. 6 is a schematic view of a joint seat according to the present utility model;

FIG. 7 is a schematic view of the mount of FIG. 6 in a bottom view;

FIG. 8 is a schematic view of a shield according to the present utility model;

fig. 9 is a cross-sectional view of the shield blades of fig. 8;

fig. 10 is a schematic enlarged view of a portion a in fig. 9.

In fig. 1 to 10, the correspondence of the components is as follows:

The device comprises a fixing seat 10, a connector seat 20, a ceramic sensor 30, a circuit board 40 and a shielding sheet 50;

The plug comprises a plug 11, an elastic clamping hook 12, a plugboard 13, a sliding rail 14, a convex block 15, a clamping hole 16 and a sealing plate 17;

The lower wall 21, the side wall 22, the joint 23, the first annular groove 24, the first sealing ring 25, the water inlet 26, the second annular groove 27, the second sealing ring 28 and the sliding groove 29;

Notch 221, slot 291, catch 292;

copper foil 51, protective layer 52, leads 53.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without making any inventive effort are intended to fall within the scope of the present utility model.

In order to make the explanation and the description of the technical solution and the implementation of the present utility model clearer, several preferred embodiments for implementing the technical solution of the present utility model are described below.

In this document, the terms "inner, outer", "front, rear", and "left, right" are expressions based on the usage status of the product, and it is apparent that the usage of the corresponding terms does not limit the scope of the present solution.

Referring to fig. 1, 2 and 3, fig. 1 is a schematic diagram of a pressure-capacity type water pressure sensor according to the present utility model, fig. 2 is a cross-sectional view of the pressure-capacity type water pressure sensor shown in fig. 1, and fig. 3 is an exploded structure schematic diagram of the pressure-capacity type water pressure sensor shown in fig. 1.

As shown in fig. 1, 2 and 3, the pressure-capacity type water pressure sensor provided by the utility model comprises a shell formed by combining a fixed seat 10 and a joint seat 20, wherein a ceramic sensor 30 and a circuit board 40 connected with the ceramic sensor 30 are arranged in the shell, and a shielding sheet 50 is arranged between the ceramic sensor 30 and a water inlet hole on the joint seat 20.

As shown in fig. 4 and 5, the fixing base 10 includes a plug 11, an elastic hook 12 is disposed on the plug 11, a circuit board slot is disposed in the plug 11, and a circuit board 40 is fastened and fixed with the circuit board slot. The plug 11 is connectable to an external connection terminal, and outputs a detection signal.

The other end of the plug 11 is provided with a plugboard 13, and two side walls of the plugboard 13 are respectively provided with a sliding rail 14. The sliding rail 14 may adopt a wedge structure, and the thickness of the joint surface of the sliding rail 14 gradually increases from the end to the root, so that the matching is tighter, and the tightness is improved.

As shown in fig. 6 and 7, the joint seat 20 includes a lower wall 21 and a side wall 22 surrounded by three surfaces, a joint 23 is provided on an outer surface of the lower wall 21, a first annular groove 24 is provided on the joint 23, a first seal ring 25 (see fig. 2) is provided in the first annular groove 24, the joint 23 is used for being inserted into a detection hole of the apparatus, and the first seal ring 25 is used for realizing sealing.

A second annular groove 27 is provided on the inner surface of the lower wall 21 around the inlet opening 26 of the connector 23, and a second sealing ring 28 is provided in the second annular groove 27 (see fig. 2).

The inner side surfaces of the two opposite side walls 22 are respectively provided with a sliding groove 29, and the sliding grooves 29 are matched with the sliding rails 14 on the plugboard 13.

The fixing seat 10 and the joint seat 20 are combined and fixed in a pluggable detachable mode.

The end of the plugboard 13 of the fixing seat 10 is provided with a lug 15, and the lug 15 is provided with a clamping hole 16. The side wall of the joint seat 20 opposite to the bump 15 is provided with a slot 291, a hook 292 (see fig. 2) is arranged in the slot 291, and the surface of the hook 292 opposite to the bump 15 is an inclined surface or an arc surface. The slide rail 14 is inserted along the slide groove 29, the protruding block 15 is inserted into the slot 291, the clamping hook 292 is clamped in the clamping hole 16, and the assembly and the fixation of the joint seat 20 and the fixing seat 10 are realized.

The three-sided surrounding side wall 22 forms a notch 221 on the joint seat 20, the root of the plug 11 on the fixing seat 10 is provided with a sealing plate 17, and the sealing plate 17 covers the notch 221 on the joint seat 20.

According to the utility model, the connector base 20 and the fixing base 10 are installed without tools, and the disassembly and assembly are convenient. The depth of the slot 291 is larger than the thickness of the bump 15, and the bump 15 can be tilted from the outside to separate the hook 292 from the card hole 16 for disassembly.

In the prior art, an electrode shielding layer is printed on the outer side surface of the ceramic sensor, so that the ceramic sensor is easy to fall off and corrode, and has a complex process. In the present embodiment, the shield sheet 50 is adhered to the outer surface of the ceramic sensor 30.

As shown in fig. 8 and 9, the shielding sheet 50 includes a copper foil 51 and a protective layer 52 disposed on the outer surface of the copper foil 51, the copper foil 51 is adhered to the surface of the ceramic sensor 30 facing the water inlet, and is pressed on the second sealing ring to realize sealing, so that the influence of parasitic capacitance generated by conductive liquid such as water on the ceramic sensor 30 can be shielded, and the accuracy of measurement is improved. The protective layer 52 is made of a teflon film material, and is coated on the outer surface of the copper foil 51, and the teflon film material is corrosion-resistant and high-temperature-resistant, so that the copper foil 51 is protected from corrosion and oxidation, the service life is prolonged, and the measurement accuracy is improved.

The outer fringe of copper foil 51 is equipped with the pin 53 of buckling, and pin 53 is connected with ceramic sensor 30's power negative pole, has further improved the interference killing feature.

By combining the description of the specific embodiments, the pressure-capacitance type water pressure sensor provided by the utility model has the following advantages compared with the prior art:

First, paste the shielding piece on ceramic sensor's the surface, the shielding piece includes copper foil and the protective layer of setting on the copper foil surface, and the copper foil can shield the influence of parasitic capacitance that electrically conductive liquid such as water produced to ceramic sensor, improves measuring accuracy, and the protective layer can protect the copper foil from corruption, oxidation, has prolonged life.

And secondly, the outer edge of the copper foil is provided with a bent pin, and the pin is connected with the power supply negative electrode of the ceramic sensor, so that the anti-interference capability is further improved.

Third, the tip of the picture peg of fixing base is equipped with the lug, is equipped with the card hole on the lug, is equipped with the slot on the lateral wall that corresponds on the joint seat, is equipped with the pothook in the slot, and the picture peg slip cartridge is on the lateral wall of joint seat, and the lug inserts in the slot, and the pothook card is in the card hole, realizes the equipment of joint seat and fixing base and is fixed, exempts from the instrument installation, easy dismounting.

Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The present utility model is not limited to the above-mentioned preferred embodiments, and any person who can learn the structural changes made under the teaching of the present utility model can fall within the scope of the present utility model if the present utility model has the same or similar technical solutions.

Claims

1. The utility model provides a pressure appearance formula water pressure sensor, includes and forms the casing by fixing base and headstock combination, be equipped with ceramic sensor in the casing and with the circuit board that ceramic sensor is connected, its characterized in that, ceramic sensor with be equipped with the shielding piece between the inlet opening on the headstock, the shielding piece includes:

and a protective layer covering the outer surface of the copper foil.

2. The pressure-tolerant water pressure sensor of claim 1, wherein,

The fixed seat comprises a plug, the other end of the plug is provided with a plugboard, and two side walls of the plugboard are respectively provided with a sliding rail;

3. The pressure-tolerant water pressure sensor according to claim 2, wherein the end of the insertion plate is provided with a bump, the bump is provided with a clamping hole, a slot is provided on the side wall of the connector base opposite to the bump, a clamping hook is provided in the slot, the sliding rail is inserted along the sliding slot, the bump is inserted into the slot, and the clamping hook is clamped in the clamping hole.

4. The pressure-tolerant water pressure sensor of claim 2 wherein the rail is wedge-shaped and the thickness of the engaging surface of the rail increases from the end to the root.

5. The pressure and volume type water pressure sensor as claimed in claim 2, wherein the joint is provided with a first annular groove, and a first sealing ring is arranged in the first annular groove.

6. The pressure-and-volume type water pressure sensor according to claim 2, wherein a second annular groove is provided on the inner surface of the lower wall around the water inlet hole, and a second seal ring is provided in the second annular groove.

7. The pressure-tolerant water pressure sensor of claim 1 wherein the copper foil is in the form of a wafer.

8. The pressure-tolerant water pressure sensor of claim 1 wherein said protective layer is a teflon film coated on the outer side of said copper foil.

9. A pressure-tolerant water pressure sensor according to claim 3, wherein the surface of the hook opposite to the projection is an inclined surface or an arc surface.

10. A pressure and water pressure sensor as claimed in claim 3 wherein the root of the plug is provided with a sealing plate to seal the gap in the socket.