CN209764318U

CN209764318U - Impact-resistant pressure transmitter

Info

Publication number: CN209764318U
Application number: CN201920994085.8U
Authority: CN
Inventors: 成大鹏; 曹玉娟
Original assignee: Suzhou Xunpeng Instrument Co Ltd
Current assignee: Suzhou Xunpeng Instrument Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2019-12-10
Anticipated expiration: 2029-06-28

Abstract

The utility model relates to a type of shocking resistance pressure transmitter, including the shell, install in shell one end and have into the pressure head in pressure hole, set up in the diffusion silicon core of the inner chamber of advancing the pressure head, diffusion silicon core with advance to be provided with the buffer board that is used for buffer pressure between the pressure hole. The buffer plate comprises a plate-shaped body matched with the cross section of the inner cavity of the pressure inlet head in shape, a groove is formed in one end face of the body, and a plurality of through holes communicating the other end face of the body with the bottom face of the groove are formed in the buffer plate; the notch of the groove faces one side of the diffusion silicon core body. The utility model discloses the buffering effect is by, and compressive shock resistance is strong, and response speed is fast, and application scope is wide.

Description

Impact-resistant pressure transmitter

Technical Field

The utility model relates to an industrial automation control field especially relates to a type of shocking resistance pressure transmitter technique to pressure measurement technique.

Background

At present, in a plurality of industrial automatic control environments, a pressure signal needs to be converted into a standard electric signal and transmitted to secondary instruments such as a digital display meter and a recorder, a PLC system, a DCS system and the like for measurement, display, alarm or control. As one of the most commonly used pressure sensors, pressure transmitters are widely used in various industrial autonomous environments, such as: petrochemical industry, water conservancy and hydropower, aerospace, military industry, electric power, machine tools, pipelines and the like.

In general, in practical application, in order to ensure the accuracy of pressure measurement, the measuring range of the pressure transmitter is selected to be 1.5 times of the measured maximum pressure. However, in practical industrial operating environments, pressure spikes or continuous pulses can occur, such as: at the moment of sudden start, stop, speed change or reversing of a hydraulic system, due to the action of flowing liquid and inertia of moving parts, very high peak pressure is formed in the system instantaneously, and the pressure peak value at the moment can reach 5 times or even 10 times of the maximum pressure, so that direct damage can be caused to pressure-sensitive elements in a pressure transmitter; continuous high voltage pulses, approaching or exceeding the maximum rated pressure of the transmitter, can also shorten the practical life of the transmitter. Increasing the transmitter pressure rating is therefore considered, but sacrifices the transmitter's measurement accuracy. In order to solve the problem of pressure impact, a corresponding buffer can be added in the pressure transmitter to weaken the peak pressure;

The conventional solution at present is to install a damping block 8 at a pressure inlet to achieve the function of pressure buffering, the product structure of the solution is shown as figure 1, wherein the damping block 8 is shown as figure 2, and the damping block 8 comprises a head part and a tail part, which are installed in the pressure inlet through threads. The damping block 8 is provided with a cavity communicated from the end surface of the head part to the side surface of the tail part, so that a pressure inlet 14 is formed on the end surface of the head part, and a pressure outlet 15 is formed on the side surface of the tail part. The pressure enters the transmitter cavity through the small holes on the side surface of the damping T8, so that the direction of the pressure is changed, the pressure cannot directly impact the diffusion silicon core, and the buffer effect is achieved.

The problems with this solution are: 1. because the damping T is small in size and small in aperture, larger measurement delay can be caused, and the response speed of the transmitter is slowed, so that the scheme is only suitable for being used in the environment with the pressure range exceeding 10 MPa; 2. the aperture of the damping T is too small, so that if fine particulate matters exist in a measuring medium, the pressure inlet hole is blocked, and the pressure transmitter fails to measure, so that the scheme can be only applied to a medium environment without solid particulate matters.

Therefore, the existing pressure transmitter with the damping nut has the advantages of low response speed and limited application occasions.

Disclosure of Invention

The utility model aims at providing a shock resistance type pressure transmitter that has better buffering effect, and the application scenario is extensive, response speed is very fast.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

The utility model provides an impact-resistant type pressure transmitter, includes the shell, install in shell one end and have into the pressure head of advancing of pressure hole, set up in advance the diffusion silicon core of the inner chamber of pressure head, diffusion silicon core with advance to be provided with the buffer board that is used for buffer pressure between the pressure hole.

Preferably, the buffer plate comprises a plate-shaped body matched with the cross section of the inner cavity of the pressure inlet head in shape, a groove is formed in one end face of the body, and a plurality of through holes communicating the other end face of the body with the bottom face of the groove are formed in the buffer plate; the notch of the groove faces one side of the diffusion silicon core body.

Preferably, 6 through holes are uniformly distributed on the buffer plate.

Preferably, the buffer plate is circular.

Preferably, a damping T is arranged in the pressure inlet hole.

Preferably, the damping T comprises a head part and a tail part, and a cavity communicated from the end face of the head part to the side face of the tail part is formed in the damping T.

Preferably, a sealing ring is arranged between the periphery of the diffusion silicon core body and the inner cavity of the pressure inlet head.

Preferably, the impact-resistant pressure transmitter further comprises a pressure ring arranged in the inner cavity of the pressure inlet head, an integrated chip connected with the diffusion silicon core body, and a hesmann joint connected to the other end of the shell.

Preferably, a fixing pad is disposed between the housing and the heusman joint.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses the buffering effect is by, and compressive shock resistance is strong, and response speed is fast, and application scope is wide.

Drawings

Fig. 1 is a schematic structural diagram of a conventional pressure transmitter.

Fig. 2 is a schematic structural diagram of a damping nut in a conventional pressure transmitter.

Fig. 3 is a schematic structural diagram of the impact-resistant pressure transmitter of the present invention.

Fig. 4 is a schematic view of an end face of the buffer plate in the impact-resistant pressure transmitter of the present invention.

Fig. 5 is another schematic end view of the buffer plate in the impact-resistant pressure transmitter of the present invention.

Fig. 6 is a schematic sectional view of the buffer plate in the impact-resistant pressure transmitter of the present invention.

In the above drawings: 1. a housing; 2. a pressure inlet head; 3. a diffused silicon core; 4. pressing a ring; 5. an integrated chip; 6. a Husman linker; 7. a buffer plate; 8. damping D; 9. a fixing pad; 10. a seal ring; 11. a body; 12. a groove; 13. a through hole; 14. a pressure inlet; 15. and (4) a pressure outlet.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings.

The first embodiment is as follows: as shown in fig. 3, the impact-resistant pressure transmitter comprises a shell 1, a pressure inlet head 2, a diffused silicon core body 3, a pressure ring 4, an integrated chip 5, a hesmann joint 6 and a buffer plate 8.

The shell 1 is in a hollow cylindrical shape, adopts a 304 or 316L stainless steel material and an integrated full stainless steel structure, thereby realizing full solid design, being convenient to install, having extremely high vibration resistance and impact resistance, and being capable of being used for a long time in severe environment.

The pressure inlet head 2 is arranged at one end of the shell 1, namely one end of the pressure inlet head 2 is connected with the shell 1 through a sealing internal thread, and 703 thread sealant is coated on the thread parts of the pressure inlet head 2 and the shell 1 to prevent loosening. And the other end of the pressure inlet head 2 protrudes to form a pressure inlet hole, and the end part is connected with a mounting base on the tested equipment through a sealing thread. The pressure inlet head 2 is provided with an inner cavity, and the pressure inlet hole is communicated with the inner cavity. The pressure inlet head 2 adopts a 304 or 316L stainless steel integrated structure, and has extremely high sealing and pressure resistance.

The diffusion silicon core body 3 is arranged in the inner cavity of the pressure inlet head 2 and is a pressure-sensitive element. An O-shaped sealing ring 10 is arranged between the periphery of the diffusion silicon core body 3 and the inner cavity of the pressure inlet head 2, so that the sealing effect of the whole pressure transmitter is realized. Before assembly, a small amount of vacuum grease needs to be evenly coated on the surface of the O-shaped sealing ring 10, so that the sealing integrity between the O-shaped sealing ring 10 and the inner wall of the pressure inlet head 2 is realized. The sealing effect of the O-shaped sealing ring 10 can reach 100 MPa. Meanwhile, the diffusion silicon core body 3 adopts a 316L stainless steel isolation diaphragm structure, and can be applied to various occasions including severe corrosive medium environments. For the diffused silicon core body 3, the side thereof close to the pressure inlet hole of the pressure inlet head 2 is defined as the front end thereof (i.e., the right side in fig. 3), and the side thereof close to the pressure inlet hole is defined as the rear end thereof (i.e., the left side in fig. 3).

The pressure ring 4 is arranged in the inner cavity of the pressure inlet head 2 and is positioned at the rear end of the diffusion silicon core body 3. The pressure ring 4 is installed in the inner cavity of the pressure head 2 through a sealing thread, the diffusion silicon core body 3 is fixed in the inner cavity of the pressure head 2, and meanwhile, the integrated chip 5 is fixed. In order to prevent the clamping ring 4 from loosening, 703 thread sealant needs to be coated on the threads of the clamping ring 4 before installation.

The integrated chip 5 is fixedly installed at the rear end of the pressure ring 4 through screws and connected with the diffused silicon core 3, and is used for converting a mV signal output by the diffused silicon core 3 into a standard analog signal output through a high-performance electronic amplification and conversion circuit, for example: 4-20mAdc or 0-10Vdc, etc., the conversion precision can reach 0.1% F.S., the anti-interference performance is strong, and the long-time operation is stable.

The heusman connector 6 is installed at the other end of the shell 1 through threads, and the pin of the heusman connector 6 is connected with the standard electric signal output by the integrated chip 5 through a wire bonding mode. A rubber fixing pad 9 is arranged between the Husmann joint 6 and the shell 1 for preventing vibration and leakage and preventing the joint 6 from sliding or loosening. And the Husmann connector 6 is made of an ABS material, and has flame retardance, voltage resistance and strong insulating property. The transmitter is provided with a Husky connector 6 which is a standard connector 6 used in the industrial field, and is convenient for field wiring and installation.

The buffer plate 8 is arranged between the diffusion silicon core body 3 and the pressure inlet hole, namely the buffer plate 8 is positioned at the front end of the diffusion silicon core body 3, and the buffer plate 8 is used for buffering pressure. As shown in fig. 4 to 6, the buffer plate 8 includes a plate-shaped body 11 matching with the cross-sectional shape of the inner cavity of the pressure inlet head 2, the body 11 is circular, and a groove 12 is formed on one end surface of the body 11, that is, on one end surface close to the diffusion silicon core 3. Meanwhile, the buffer plate 8 is provided with a plurality of through holes 13 communicating the other end surface, namely one end surface close to the pressure inlet hole and the bottom surface of the groove 12. After mounting, the notches of the grooves 12 on the buffer plate 8 face the side of the diffused silicon core 3. In this embodiment, the groove 12 is also circular, and 6 through holes 13 are uniformly distributed on the buffer plate 8. After pressure enters through the through holes 13 arranged on the buffer plate 8, the pressure passes through the circular grooves 12 on the buffer plate 8, so that the dispersion buffer of peak impact pressure is realized, the instant impact force on the 3 diaphragms of the diffusion silicon pressure core body is reduced, and the diaphragms are well protected from being damaged. The buffer plate 8 is made of 304 or 316L stainless steel, and is suitable for various corrosive medium environments.

The pressure transmitter of the scheme can be applied to occasions with the pressure range smaller than 10MPa, or the measuring medium contains solid particles, or the field environment which is unsuitable for the damping T with high requirement on the response speed of pressure measurement can bear full-range pressure with the pressure impact capacity more than 3 times, so that the problems of low pressure response speed and blockage of fine solid particles into pressure holes caused by the damping T are well solved, and the application range is wide.

Furthermore, the scheme of the application buffer plate 8 can be combined with the scheme of the damping nut, namely in some embodiments, the anti-impact pressure transmitter further comprises the damping nut arranged in the pressure inlet hole, the damping nut comprises a head portion and a tail portion, and a cavity communicated from the end face of the head portion to the side face of the tail portion is formed in the damping nut. This scheme is on the basis of the scheme of traditional installation damping butyl, through increasing installation buffer board 8 structures at diffusion silicon core 3 front end, improves the buffering effect to peak pressure impact, improves the full scale pressure that resistance to pressure impact ability to more than 6 times.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides an impact-resistant type pressure transmitter, includes the shell, install in shell one end and have into the pressure head of advancing of pressure hole, set up in advance the diffusion silicon core of the inner chamber of pressure head, its characterized in that: and a buffer plate for buffering pressure is arranged between the diffusion silicon core body and the pressure inlet hole.

2. An impact-resistant pressure transmitter as claimed in claim 1, wherein: the buffer plate comprises a plate-shaped body matched with the cross section of the inner cavity of the pressure inlet head in shape, a groove is formed in one end face of the body, and a plurality of through holes communicated with the other end face of the buffer plate and the bottom face of the groove are formed in the buffer plate; the notch of the groove faces one side of the diffusion silicon core body.

3. An impact-resistant pressure transmitter as claimed in claim 2, wherein: 6 through-holes are uniformly distributed on the buffer plate.

4. An impact-resistant pressure transmitter as claimed in claim 2, wherein: the buffer plate is circular.

5. An impact-resistant pressure transmitter as claimed in any one of claims 1 to 4, wherein: and a damping T is arranged in the pressure inlet hole.

6. An impact-resistant pressure transmitter as claimed in claim 5, wherein: the damping T comprises a head part and a tail part, and a cavity communicated from the end face of the head part to the side face of the tail part is formed in the damping T.

7. An impact-resistant pressure transmitter as claimed in any one of claims 1 to 4, wherein: and a sealing ring is arranged between the periphery of the diffusion silicon core body and the inner cavity of the pressure inlet head.

8. an impact-resistant pressure transmitter as claimed in any one of claims 1 to 4, wherein: the impact-resistant pressure transmitter further comprises a pressure ring arranged in the inner cavity of the pressure inlet head, an integrated chip connected with the diffusion silicon core body and a Husman joint connected to the other end of the shell.

9. An impact-resistant pressure transmitter as recited in claim 8 wherein: and a fixing pad is arranged between the shell and the Husky man joint.