Flat film capacitive pressure transmitter

Abstract

The utility model provides a flat-film capacitive pressure transmitter, which belongs to the technical field of capacitive pressure transmitters and comprises a base, a shell mounted at the top of the base, a connector assembly mounted at the top of the shell, a flat-film pressure guide hole arranged inside the base, a sealing element mounted at the top of the flat-film pressure guide hole, and a pressure sensor mounted at the bottom of the flat-film pressure guide hole. A ceramic capacitance sensor is installed at the top of the sealing piece, a gap is reserved between the top of the sealing piece and the bottom of the ceramic capacitance sensor, a circuit board is installed at the top of the ceramic capacitance sensor, a locking ring sleeves the top of the circuit board, the locking ring is fixed to the top of the ceramic capacitance sensor, and a shell sleeves the top of the locking ring. The circuit board is connected with the connector assembly through an output signal line. The pressure transmitter can be suitable for viscous liquid media, has high measurement precision and high measurement stability, can prevent large-particle blockages in the media and is convenient to clean due to the fact that the aperture of the flat film pressure guide hole is large, and it is guaranteed that the pressure transmitter can continuously, effectively and stably work for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flat diaphragm capacitive pressure transmitter. BACKGROUND

[0002] Pressure transmitters are important industrial automation instruments widely used in various industrial applications for converting pressure parameters of gases, liquids and other media into standard electrical signals. This conversion allows remote monitoring, recording and control of pressure parameters, thereby improving the automation level and efficiency of the production process. However, when selecting a pressure transmitter, various factors need to be considered, such as application, pressure type (e.g. absolute pressure, gauge pressure or differential pressure), measurement range, protection performance, etc. Different applications have different requirements for pressure transmitters. For example, in the food processing and pharmaceutical industries, there is a strong demand for sanitary sensors due to strict requirements for equipment cleanliness and hygiene.

[0003] However, the inlet pressure hole diameter of conventional pressure transmitters is usually small, which limits their application range to some extent, especially in viscous fluid pressure and liquid level measurement. Small-diameter inlet pressure holes are prone to accumulate fluid, leading to scaling and clogging problems, which not only affects the accuracy of measurement, but also increases the difficulty of maintenance and cleaning.

[0004] In view of the above problems of small-diameter inlet pressure holes, the demand for sanitary sensors in the market is increasing; however, the structure of sanitary sensors in the prior art is not universal, limiting their application in viscous fluid measurement. The design of sanitary sensor structure needs to consider factors such as easy cleaning and prevention of cross-contamination to ensure measurement accuracy and equipment hygiene.

[0005] Ordinary corrugated diaphragms are easily affected by external forces during installation and use, resulting in deformation. This deformation not only affects the accuracy of measurement, but also may cause damage or failure of the equipment, especially in high-pressure, high-temperature or corrosive medium applications, the risk of corrugated diaphragm deformation is more prominent.

[0006] The existing pressure transmitters have some problems in terms of inlet pressure hole diameter, sanitary sensor structure and corrugated diaphragm deformation, which limit their application range and use effect. Therefore, it is necessary to improve and optimize the pressure transmitter to solve these problems and improve its performance. SUMMARY

[0007] The utility model discloses a purpose lies in providing a kind of flat film capacitive pressure transmitter to overcome the problems existing in prior art, the utility model can be applicable to viscous liquid medium, with the high accuracy of measurement, high stability;Meanwhile, the pressure hole aperture of the device is big, flat film structure can prevent the large particle plug in medium, convenient cleaning, ensure that pressure transmitter can long time continuously effective stable work;In addition, the structure of the pressure transmitter of the device is simple, and it is convenient to install.

[0008] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0009] A kind of flat film capacitive pressure transmitter, including base, the top of base is installed with shell, the top of shell is installed with connector assembly;

[0010] The inside of the base is provided with flat film pressure hole, the top of flat film pressure hole is installed with sealing element, the top of sealing element is installed with ceramic capacitor sensor, and the top of sealing element is left with gap with the bottom of ceramic capacitor sensor, the top of ceramic capacitor sensor is installed with circuit board, the top of circuit board is sleeved with lock ring, lock ring is fixed at the top of ceramic capacitor sensor, and the top of lock ring is sleeved with shell;

[0011] The circuit board is connected with connector assembly by output signal line;

[0012] Further, the circuit board is double-layer structure fixedly connected by single-row plug pin;

[0013] Further, the top of flat film pressure hole is provided with sealing groove, and sealing element is installed in sealing groove;The aperture of flat film pressure hole is φ8 mm ~ φ11 mm;

[0014] Further, the bottom of the base is installed with connection interface;

[0015] Further, one end of the base is provided with first external thread, and the connection interface is provided with first internal thread matched with the first external thread;

[0016] Further, the other end of the base is provided with stepped hole, and one end of the shell is provided with stepped surface matched with the stepped hole of the base;

[0017] Further, the other end of the shell is provided with second external thread, and one end of the connector assembly is provided with second internal thread matched with the second external thread;

[0018] Further, the connector assembly includes socket, and the top of socket is installed with plug;

[0019] Further, the bottom of the socket is provided with second internal thread on the inside;

[0020] Further, the socket is connected with the circuit board through an output signal line.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] The utility model provides a kind of flat membrane capacitive pressure transmitter, by using ceramic capacitor sensor, with corrosion resistance, impact resistance, high elasticity advantage, can be directly contacted with vast majority of medium, diaphragm contacts on pedestal without damage when overload, to convert pressure signal into capacitive signal output, and structure is small, fixed mode is simple and reliable, suitable for small volume pressure transmitter, cheap, with high stability, high precision nature;By sealing element can install sealing effect to ceramic capacitor sensor, the stability of device is enhanced.

[0023] Further, the double-layer circuit board design allows for more detailed planning of circuit layout and wiring, reducing mutual interference between circuits and improving signal purity and stability to ensure measurement signal accuracy and reduce errors.

[0024] Further, by setting the hole diameter of the flat membrane pressure guiding hole to φ8 mm ~φ11 mm, the large hole diameter of the flat membrane pressure guiding hole and large pressure contact area can prevent medium blockage, facilitate cleaning of the contact surface of the ceramic capacitor sensor 1 and the pedestal 3, and prolong the service life of the product.

[0025] Further, by setting external threads and internal threads, the tight connection between the pedestal and the connection interface and between the shell and the connector assembly is ensured, further enhancing connection stability.

[0026] Further, by setting the stepped hole and stepped surface, external medium can be effectively prevented from entering the pressure transmitter, thereby improving the sealing performance of the device.

[0027] Further, the socket, as part of the connector assembly, is connected with the circuit board through a dedicated output signal line, which ensures stable transmission of measurement signals, thereby supplying other devices through the connection assembly. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is an installation structure schematic diagram of the utility model discloses a kind of flat membrane capacitive pressure transmitter;

[0029] Figure 2 It is an internal structure schematic diagram of the utility model discloses a kind of flat membrane capacitive pressure transmitter;

[0030] Figure 3 It is a split structure schematic diagram of the utility model discloses a kind of flat membrane capacitive pressure transmitter;

[0031] In the figure, 1-ceramic capacitance sensor; 2-circuit board; 3-base; 31-connection interface; 4-housing; 5-locking ring; 6-seal; 7-connector assembly; 71-socket; 72-plug; 8-flat film pressure guiding hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that when one component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed in the middle. When one component is considered to be "disposed on" another component, it can be directly disposed on the other component or there can be a component disposed in the middle.

[0034] In addition, the terms "long", "short", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have this particular orientation, be constructed in this particular orientation, and be operated in this particular orientation. It cannot be understood as a limitation of the present application.

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] Embodiment 1:

[0037] As Figure 1As shown, the utility model provides a flat-film capacitive pressure transmitter, including a base 3, a connecting interface 31 is installed at the bottom of the base 3, a first external thread is provided at one end of the bottom of the base 3, and the connecting interface 31 is provided with a first internal thread matching the first external thread, a shell 4 is installed on the top of the base 3, a stepped hole is provided on the inner side of the other end of the base 3, and one end of the shell 4 is provided with a stepped surface matching the stepped hole of the base 3, a connector assembly 7 is installed on the top of the shell 4, the other end of the shell 4 is provided with a second external thread, and one end of the connector assembly 7 is provided with a second internal thread matching the second external thread, the connector assembly 7 includes a socket 71, a plug 72 is installed on the top of the socket 71, and the second internal thread is provided on the inner side of the bottom of the socket 71.

[0038] like Figure 2 and Figure 3 As shown, a flat membrane pressure-inducing hole 8 is provided inside the base 3, and the aperture of the flat membrane pressure-inducing hole 8 is φ8 mm~φ11 mm. A sealing groove is provided on the top of the flat membrane pressure-inducing hole 8, and a sealing member 6 is installed in the sealing groove. A ceramic capacitor sensor 1 is installed on the top of the sealing member 6, and a gap is left between the top of the sealing member 6 and the bottom of the ceramic capacitor sensor 1. A circuit board 2 is installed on the top of the ceramic capacitor sensor 1. The circuit board 2 is a double-layer structure fixedly connected by a single row of pins. The circuit board 2 is connected to the socket 71 of the connector assembly 7 through an output signal line. A locking ring 5 is provided on the top of the circuit board 2, and the locking ring 5 is fixed to the top of the ceramic capacitor sensor 1. The top of the locking ring 5 is provided with a shell 4.

[0039] Example 2:

[0040] like Figure 1 and Figure 3 As shown, the utility model includes a ceramic capacitive sensor 1, a circuit board 2, a base 3, a connection interface 31, a housing 4, a locking ring 5, a seal 6 and a connector assembly 7; the connector assembly 7 includes a socket 71 and a plug 72;

[0041] A connecting interface 31 is installed at the bottom of the base 3, a first external thread is provided at one end of the bottom of the base 3, and a first internal thread is provided at the connecting interface 31 that matches the first external thread. A shell 4 is installed at the top of the base 3, a stepped hole is provided on the inner side of the other end of the base 3, and a stepped surface that matches the stepped hole of the base 3 is provided at one end of the shell 4. A connector assembly 7 is installed at the top of the shell 4, a second external thread is provided at the other end of the shell 4, and a second internal thread that matches the second external thread is provided at one end of the connector assembly 7. The connector assembly 7 includes a socket 71, a plug 72 is installed at the top of the socket 71, and the second internal thread is provided on the inner side of the bottom of the socket 71;

[0042] Preferably, the stepped hole of the base 3 and the stepped surface of the housing 4 are fixed by welding, which can achieve better protection effect;

[0043] Preferably, the connector assembly 7 is a Hirschmann connector assembly;

[0044] Preferably, the plug 72 is plugged into the socket 71 and fixed by long screws;

[0045] like Figure 2 As shown, the base 3 is provided with a flat membrane pressure-inducing hole 8, and the diameter of the flat membrane pressure-inducing hole 8 is φ8 mm ~ φ11 mm, the aperture of the flat membrane pressure-introducing hole 8 is large, and the pressure measurement contact area is large, which can prevent medium clogging, facilitate cleaning of the contact surface between the ceramic capacitor sensor 1 and the base 3, and extend the service life of the product. A sealing groove is provided on the top of the flat membrane pressure-introducing hole 8, and a seal 6 is installed in the sealing groove. The ceramic capacitor sensor 1 is installed on the top of the seal 6. The ceramic capacitor sensor 1 has a small structure, a simple and reliable fixing method, is suitable for a small-volume pressure transmitter, is cheap, and has high stability and high precision. The ceramic capacitor pressure sensor 1 can convert a pressure signal into a capacitance signal output and is widely used in air pressure control and liquid level detection of equipment such as automobiles, air conditioners, and boilers; a gap is left between the top of the seal 6 and the bottom of the ceramic capacitor sensor 1, and a circuit board 2 is installed on the top of the ceramic capacitor sensor 1. The circuit board 2 is a double-layer structure fixedly connected by a single row of pins. The circuit board 2 is connected to the socket 71 of the connector assembly 7 through an output signal line. A locking ring 5 is sleeved on the top of the circuit board 2, and the locking ring 5 is fixed on the top of the ceramic capacitor sensor 1. The top of the locking ring 5 is sleeved on the shell 4;

[0046] Preferably, the sealing member 6 is an O-ring, which plays a role in installing and sealing the ceramic capacitive sensor 1;

[0047] Preferably, the circuit board 2 is a double-layer circular structure fixedly connected by a single row of pins, with reasonable design, high precision and good long-term stability;

[0048] Preferably, the pins of the ceramic capacitive sensor 1 are electrically connected to the circuit board 2;

[0049] Preferably, the circuit board 2 is installed in the inner cavity of the locking ring 5 and does not contact the inner cavity of the locking ring 5 to achieve insulation protection;

[0050] Preferably, the signal line is a silicone line;

[0051] Preferably, the output signal line is welded to the socket 71 .

[0052] The structural assembly of the utility model is further described below:

[0053] The utility model discloses a flat film capacitor pressure transmitter, when assembling the device, ceramic capacitor sensor 1 is assembled in the inner chamber of base 3, locking ring 5 and the O type sealing ring under the bottom surface of ceramic capacitor sensor 1 are fixed to base 3 through thread compression, the O type sealing ring is sealed and is close to the outer diameter of ceramic capacitor sensor 1 and avoids the sensitive area of ceramic capacitor sensor 1, ceramic capacitor sensor 1 cannot be directly pressed flat on the step surface of base 3, locking ring 5 avoids the 3 pins of ceramic capacitor sensor 1, and is compressed on the ceramic panel of ceramic capacitor sensor 1, double -layer circuit board 2 is installed in the inner chamber of locking ring 5, and the pin of ceramic capacitor sensor 1 is welded with circuit board 2, and the capacitance output of ceramic capacitor sensor 1 is inversely proportional to the pressure signal, and the capacitance output of ceramic capacitor sensor 1 carries out pressure conversion on circuit board 2, and circuit board 2 is welded through silica gel wire output and transmission to Hesman connector assembly 7, realizes electrical connection, thereby through Hesman connection assembly 7 supplies other equipment use, and base 3 and shell 4 are laser welded, and Hesman connector assembly 7 is fixed to shell 4 through screw connection, that is, the assembly of whole transmitter is completed.

[0054] The above-described embodiments are merely used to illustrate the technical solutions of the utility model, rather than limit the utility model; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: still can modify the technical solutions recorded in the foregoing embodiments, or equivalent replacement is carried out to part technical features to the foregoing embodiments; and these modifications or replacements do not make the essence of corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model embodiments.

Claims

1. A flat film capacitive pressure transmitter, characterized in that: It comprises a base (3), a shell (4) is mounted on the top of the base (3), and a connector assembly (7) is mounted on the top of the shell (4); A flat membrane pressure-inducing hole (8) is provided inside the base (3), a sealing member (6) is installed on the top of the flat membrane pressure-inducing hole (8), a ceramic capacitance sensor (1) is installed on the top of the sealing member (6), a gap is left between the top of the sealing member (6) and the bottom of the ceramic capacitance sensor (1), a circuit board (2) is installed on the top of the ceramic capacitance sensor (1), a locking ring (5) is sleeved on the top of the circuit board (2), the locking ring (5) is fixed on the top of the ceramic capacitance sensor (1), and a housing (4) is sleeved on the top of the locking ring (5); The circuit board (2) is connected to the connector assembly (7) via an output signal line.

2. A flat film capacitive pressure transmitter according to claim 1, characterized in that: The circuit board (2) is a double-layer structure fixedly connected by a single row of pins.

3. The flat film capacitive pressure transmitter according to claim 1, characterized in that: A sealing groove is provided at the top of the flat membrane pressure-inducing hole (8), and a sealing member (6) is installed in the sealing groove; the aperture of the flat membrane pressure-inducing hole (8) is φ8 mm to φ11 mm.

4. The flat film capacitive pressure transmitter according to claim 1, characterized in that: A connection interface (31) is installed at the bottom of the base (3).

5. The flat film capacitive pressure transmitter according to claim 4, characterized in that: One end of the base (3) is provided with a first external thread, and the connection interface (31) is provided with a first internal thread that matches the first external thread.

6. The flat film capacitive pressure transmitter according to claim 5, characterized in that: A stepped hole is provided on the inner side of the other end of the base (3), and a stepped surface that matches the stepped hole of the base (3) is provided on one end of the shell (4).

7. The flat film capacitive pressure transmitter according to claim 6, characterized in that: The other end of the housing (4) is provided with a second external thread, and one end of the connector assembly (7) is provided with a second internal thread matching the second external thread.

8. The flat film capacitive pressure transmitter according to claim 1, characterized in that: The connector assembly (7) comprises a socket (71), and a plug (72) is mounted on the top of the socket (71).

9. The flat film capacitive pressure transmitter according to claim 8, characterized in that: A second internal thread is provided on the inner side of the bottom of the socket (71).

10. The flat film capacitive pressure transmitter according to claim 8, characterized in that: The socket (71) is connected to the circuit board (2) via an output signal line.

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