CN219736665U - Safety-increasing pressure transmitter with external zeroing function - Google Patents

Abstract

The utility model discloses an increased-safety pressure transmitter with an external zeroing function, which belongs to the field of pressure transmitters, wherein a shell is sleeved on a base of a transmitter body, a zeroing device is welded in a through hole of the side wall of the shell, the zeroing device consists of a shell and a zeroing mandrel, the zeroing mandrel rotates through a zeroing knob, and the other end of the zeroing mandrel is connected to an adjusting button of a zeroing potentiometer of an output circuit board; the zeroing knob is arranged outside the side wall of the shell; when the zero setting device is used, the zero setting knob is rotated, so that the zero setting mandrel rotates in the shell to drive the adjusting knob of the zero setting potentiometer to rotate, and the external zero setting function is realized; the pressure transmitter has the advantages of simple structure and principle, convenient use, strong operability and protection level, and good popularization and application value.

Description

Safety-increasing pressure transmitter with external zeroing function

Technical Field

The utility model belongs to the field of pressure transmitters, and particularly relates to an increased-safety pressure transmitter with an external zero setting function.

Background

The pressure transmitter is a device for converting pressure into pneumatic signals or electric signals for control and remote transmission, and can convert physical pressure parameters of gas, liquid and the like sensed by the load cell sensor into standard electric signals for supplying to secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process adjustment. The pressure transmitter is a sensor most commonly used in industrial practice, and has the advantages of high response speed, strong antistatic capability and on-site zeroing calibration, so that the pressure transmitter is widely applied to various industrial self-control environments, and relates to various industries such as water conservancy and hydropower, railway transportation, intelligent building, production self-control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like.

However, the phenomenon of output zero drift of the pressure transmitter can occur in the long-time use process, and the output zero drift can affect the measurement accuracy of a pressure system, so that the transmitter is often required to be zeroed on site, an electrical connector of the pressure transmitter needs to be disassembled in the conventional on-site zeroing calibration process, then a zero output signal is regulated by a needle, and finally the electrical connector is installed. The mode of dismantling and zeroing the transmitter has the defects that firstly, the field space is limited, and the disassembly is inconvenient; in addition, the detached transmitter has the risk of sealing failure, cannot restore to the original protection level, and is easy to damage internal elements.

It follows that there is a need to design a transmitter that can achieve zero setting without disassembly.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the safety-increasing pressure transmitter with the external zeroing function, which can be zeroed on site without disassembling the transmitter, and ensures the protection level of products.

In order to achieve the above purpose, the present utility model adopts the following technical contents:

an increased-safety pressure transmitter with an external zeroing function comprises a transmitter body;

the transmitter body comprises a base and a shell sleeved on the base;

an output circuit board is adhered to the base;

a zeroing device is welded in the through hole of the side wall of the shell;

the zeroing device comprises a shell, wherein the shell is integrally embedded in the side wall of the shell, and a zeroing mandrel is inserted in a cavity of the shell;

one end of the zeroing mandrel is connected with a zeroing knob, and the other end of the zeroing mandrel is connected to the output circuit board;

the zeroing knob protrudes out of the side wall of the shell.

Further, a second O-shaped sealing ring is sleeved on the zeroing mandrel, and the circumferential outer surface of the second O-shaped sealing ring is tightly attached to the inner wall of the shell.

Further, one end of the zeroing mandrel is provided with a step structure, the top end of the step structure is provided with an inclined plane, the shell is correspondingly provided with a convex structure, and one end of the zeroing mandrel is in interference connection with the shell.

Further, an adapter is welded at the bottom of the base; the sensor is welded on the adapter, is positioned in the base and is electrically connected with the output circuit board; and the bottom of the adapter is connected with a welding joint.

Further, the adapter, the welding joint and the sensor are all made of stainless steel of the type 316LVAR, and the outer surface of the stainless steel is subjected to EP electropolishing.

Further, the adapter is connected with the welding joint through a movable nut.

Further, the welded joint adopts a 1/4VCR joint; the movable nut adopts a 9/16-18UNF nut.

Further, a damping support piece is arranged at the upper end of the output circuit board, and a first O-shaped sealing ring is arranged on the damping support piece; one surface of the first O-shaped sealing ring is connected with the damping support piece, and the other surface of the first O-shaped sealing ring is connected with the top wall of the shell.

Further, a ferrule is mounted on top of the housing.

Further, the sensor adopts a silicon micro-melting principle sensor.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides an increased-safety pressure transmitter with an external zeroing function, which is characterized in that a shell is sleeved on a base of a transmitter body, a zeroing device is welded in a through hole of the side wall of the shell, the zeroing device consists of a shell and a zeroing mandrel, the zeroing mandrel rotates through a zeroing knob, and the other end of the zeroing mandrel is connected to an adjusting button of a zeroing potentiometer of an output circuit board; the zeroing knob is arranged outside the side wall of the shell; when the zero setting device is used, the zero setting knob is rotated, so that the zero setting mandrel rotates in the shell to drive the adjusting knob of the zero setting potentiometer to rotate, and the external zero setting function is realized; the pressure transmitter has the advantages of simple structure and principle, convenient use, strong operability and protection level, and good popularization and application value.

Preferably, the zeroing mandrel is sleeved with the second O-shaped sealing ring, and the circumferential outer surface of the second O-shaped sealing ring is tightly attached to the inner wall of the shell; therefore, the IP protection and the external zeroing are in contradiction, so that the structure is adopted, and the high protection performance is ensured on the premise of having the external zeroing function.

Preferably, the utility model adopts the step structure arranged at one end of the zeroing mandrel, the top end of the step structure adopts the inclined plane structure, the corresponding shell is provided with the convex part structure, the convex part structure is complementarily matched with the step structure during assembly, meanwhile, one end of the zeroing mandrel is in interference connection with the shell, the zeroing knob mandrel can be smoothly installed into the zeroing knob shell 13, the limit design is realized, and when the external zeroing function is used, the zeroing knob mandrel part can only radially rotate and cannot axially displace, and the accurate electronic components in the product cannot be influenced due to overlarge force.

Preferably, the adapter, the welding joint and the sensor are all made of 316LVAR stainless steel, and the outer surface of the stainless steel is subjected to EP electropolishing treatment, so that the pressure transmitter has a measuring structure with corrosion resistance far exceeding that of a traditional pressure transmitter.

Preferably, the upper end of the output circuit board is provided with the damping support piece and the first O-shaped sealing ring, so that the damping and buffering effects are achieved, and the protection of internal product elements is ensured.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an enhanced pressure transmitter with external zeroing function;

FIG. 2 is a side cross-sectional view of a zeroing apparatus provided in an embodiment of the present utility model;

fig. 3 is a front view of a zeroing apparatus according to an embodiment of the present utility model;

fig. 4 is a side cross-sectional view of another view of a zeroing apparatus provided by an embodiment of the present utility model.

Reference numerals:

a sensor-1; an output circuit board-2; welding a joint-3; a movable nut-4; an adapter-5; a base-6; a housing-7; zero setting device-8; a shock absorbing support member-9; a first O-shaped sealing ring-10; a ferrule-11; a tag-12; a housing-13; a second O-ring seal-14; zeroing the mandrel-15; zero-setting knob-16; step structure-17; and a convex structure-18.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the following specific embodiments are used for further describing the utility model in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the attached drawing figures:

examples

As shown in fig. 1, the present embodiment provides an increased-safety pressure transmitter with an external zeroing function, and in this embodiment, the increased-safety pressure transmitter specifically includes a sensor 1, an output circuit board 2, a welding joint 3, a movable nut 4, an adapter 5, a base 6, a housing 7, a zeroing device 8, a shock absorbing support 9, a first O-ring 10, a ferrule 11, and a tag 12.

Referring to fig. 1, the assembly and manufacturing process of the present embodiment is as follows:

on the basis of the welding joint 3, a movable nut 4 of universal threads 9/16-18UNF in the semiconductor industry is installed, the welding joint 3 and the adapter 5 are welded in a hundred-grade clean workshop, then the welding of the adapter 5 and a sensor 1 of a silicon micro-melting principle is completed by utilizing a tool, after the tool is replaced, the welding of a base 6 and a supporting adapter 5 is completed, an output circuit board 2 is bonded on the base 6, a damping support piece 9 is installed at the upper end of the output circuit board 2, a shell 7 is extruded through a first O-shaped sealing ring 10 to absorb shock, an assembly position is reserved on the side wall of the shell 7, after the assembly position is aligned with a zero setting device 8 and an adjusting button of a potentiometer of the output circuit board 2, the shell 7 and the base 6 are welded, then the zero setting device 8 and the shell 7 of a product are welded, AB glue is smeared on a plug 11 of M12X 1 four-core, and the assembly is installed to the top end of the shell 7, so that the assembly is completed; the viewing is convenient, and a label 12 is also stuck on the outer wall of the shell 7; particularly, all welding positions are welded by adopting a single-sided welding and double-sided forming welding process, argon protection welding is adopted, and the welding process is adopted, so that the welding effect is stable and clean.

As shown in fig. 2, 3 and 4, the zeroing device 8 includes a housing 13, a second O-ring 14, a zeroing mandrel 15 and a zeroing knob 16, and the specific assembly structure is as follows:

the zeroing device 8 is a small micro-volume customized structural part, the shell 13, the zeroing mandrel 15 and the second O-shaped sealing ring 14 are used for forming the zeroing device 8, namely, the diameter of the shell 13 is 4mm, the height of the zeroing device 8 is 2mm, the zeroing device 8 is formed by curved laser pulse welding, according to the laser welding principle, the height difference of the welding part cannot be too large, the volume of a limiting part is limited, the normal rotation of the part can be ensured, meanwhile, the high-level protective performance of the part is ensured, the top end of the zeroing mandrel 15 is an interference inclined plane combined with an embedded step design, namely, the step structure 17 is complementarily matched with the convex part structure of the shell 13, the zeroing mandrel 15 can be smoothly installed into the shell 13, meanwhile, the limiting design is achieved, and when the external zeroing function is used, the zeroing mandrel 15 can only radially rotate and cannot axially displace, and the internal precise electronic components of a product cannot be influenced due to too large force. Meanwhile, the second O-shaped sealing ring 14 is selected according to the GB3452 standard, a static sealing design with the compression ratio of 15% is formed by the second O-shaped sealing ring and the zeroing mandrel 15, the zeroing mandrel 15 has enough strength according to simulation, interference fit and compression fit are met, electrodeless rotation can be achieved under the condition that IP67 high-level protection is met, and an external zeroing function is achieved.

It should be noted that in order to improve the protection level, ensure that the second O-ring which is only 2mm away from the welding seam will not burn out while welding is melted, and after welding is completed, the test of the compression amount of the O-ring needs to be verified for a plurality of times, so that the whole product can reach the protection level of IP67, the design optimization of parts is changed, and the design of the traditional pressure transmitter is not provided, and is a great innovation carried out according to the requirement. Meanwhile, the sensor 1, the adapter 5 and the welding joint 3 adopt stainless steel 316LVAR which is treated by a unique smelting process, and special process EP electropolishing treatment is carried out on the surface of the stainless steel, so that the product has a measuring structure with corrosion resistance far exceeding that of a traditional pressure transmitter. The unique welding technique ensures that the stainless steel is melted and welded, and simultaneously, the surface around the welding line is free from impurity precipitation, thereby being more in line with the use standard of the semiconductor industry.

The embodiment provides an increased security pressure transmitter with an external zeroing function, and the working principle is as follows: the pressure transmitter is characterized in that a shell 7 is sleeved on a base 6 of a transmitter body, a zero setting device 8 is welded in a through hole in the side wall of the shell 7, the zero setting device 8 consists of a shell 13 and a zero setting mandrel 15, the zero setting mandrel 15 rotates the base by using a zero setting knob 16, and the other end of the zero setting mandrel 15 is connected to an adjusting knob of a zero setting potentiometer of an output circuit board 2; the zeroing knob is arranged outside the side wall of the shell; when the zeroing operation of the transmitter is needed, the zeroing knob 16 is rotated, so that the zeroing mandrel 15 rotates in the shell 13 to drive the adjusting knob of the zeroing potentiometer to rotate, the function of external zeroing is realized, the internal resistance change of the zeroing potentiometer is realized, and the purpose of zero output adjustment of the pressure transmitter is achieved.

The utility model provides an increased-safety pressure transmitter with an external zero setting function, which is based on special requirements of the semiconductor industry on the transmitter, and is upgraded and improved on the basis of the traditional pressure transmitter, so that the functions are widened. The product is anticorrosion and compatible with various corrosive gas media such as HCL, PCL3, POCL3, HF, siF4, CLF3 and the like, has a zero drift adjusting function, is convenient and quick to externally arrange a zero setting knob, has IP 67-level protective performance, can reach 5g/2000Hz in vibration test, and can reach 100g and 11ms in impact. In the semiconductor production process, the use requirements of most production environments can be met, and the pressure output is accurately measured. Compared with the traditional transmitter, the transmitter has the following advantages:

(A) The utility model realizes breakthrough design on the structure of the traditional transmitter, ensures that the zeroing knob is externally arranged on the side wall of the product, and ensures that the product has excellent IP protection level.

(B) The stainless steel 316LVAR treated by the specific smelting process is subjected to special treatment of the electropolishing EP process, so that the liquid receiving part of the product can be compatible with corrosive gases required in the production of various semiconductors.

(C) The utility model adopts VCR interface to increase EP electropolishing process, which ensures high cleaning grade and high level anti-corrosion property.

(D) The product modular design, circuit and sensor can be separately demarcating the processing, if one party appears the quality problem, can accomplish the change maintenance under the condition that does not influence the other party.

The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present utility model, and the scope of the claimed utility model is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present utility model.

Claims (10)

1. An increased-safety pressure transmitter with an external zeroing function is characterized by comprising a transmitter body;

the transmitter body comprises a base (6) and a shell (7) sleeved on the base (6);

an output circuit board (2) is adhered to the base (6);

a zeroing device (8) is welded in the side wall through hole of the shell (7);

the zeroing device (8) comprises a shell (13), wherein the shell (13) is integrally embedded in the side wall of the shell (7), and a zeroing mandrel (15) is inserted in a cavity of the shell (13);

one end of the zeroing mandrel (15) is connected with a zeroing knob (16), and the other end of the zeroing mandrel is connected to the output circuit board (2);

the zeroing knob (16) protrudes out of the side wall of the shell (7).

2. The safety-increasing pressure transmitter with the external zeroing function according to claim 1, wherein a second O-shaped sealing ring (14) is sleeved on the zeroing mandrel (15), and the circumferential outer surface of the second O-shaped sealing ring (14) is tightly attached to the inner wall of the shell (13).

3. The safety-increasing pressure transmitter with the external zeroing function according to claim 1, wherein a step structure (17) is arranged at one end of the zeroing core shaft (15), the top end of the step structure is arranged by adopting an inclined plane, a convex structure (18) is correspondingly arranged on the shell (13), and one end of the zeroing core shaft (15) is in interference connection with the shell (13).

4. The safety-increasing pressure transmitter with the external zeroing function according to claim 1, wherein an adapter (5) is welded at the bottom of the base (6); the sensor (1) is welded on the adapter (5), and the sensor (1) is positioned in the base (6) and is electrically connected with the output circuit board (2); the bottom of the adapter (5) is connected with a welding joint (3).

5. The safety-enhanced pressure transmitter with the external zeroing function according to claim 4, wherein the adapter (5), the welding joint (3) and the sensor (1) are all made of stainless steel of the type 316LVAR, and the outer surface of the stainless steel is subjected to EP electropolishing.

6. The safety-increasing pressure transmitter with the external zeroing function according to claim 4, wherein the adapter (5) is connected with the welding joint (3) through a movable nut (4).

7. The safety-enhanced pressure transmitter with external zeroing function according to claim 6, wherein the welding joint (3) is a 1/4VCR joint; the movable nut (4) adopts a 9/16-18UNF nut.

8. The safety-enhanced pressure transmitter with external zeroing function according to claim 4, wherein the sensor (1) is a silicon micro-fusion principle sensor.

9. The safety-increasing pressure transmitter with the external zeroing function according to claim 1, wherein a damping support (9) is installed at the upper end of the output circuit board (2), and a first O-shaped sealing ring (10) is arranged on the damping support (9); one surface of the first O-shaped sealing ring (10) is connected with the damping support piece (9), and the other surface of the first O-shaped sealing ring is connected with the top wall of the shell.

10. An increased safety pressure transmitter with external zeroing according to claim 1, wherein the top of the housing (7) is fitted with a ferrule (11).