CN213932912U - Pressure transmitter - Google Patents

Abstract

The utility model provides a pressure transmitter relates to the pressure measurement device field, designs for the lower problem of the precision of solving current pressure transmitter. The pressure transmitter comprises a shell, an induction rod, a measuring rod, a control module and a trigger assembly, wherein the shell is provided with an inner cavity and a measuring port communicated with the inner cavity; the sensing rod is inserted into the measuring port and matched with the measuring port, the first end of the sensing rod is used for sensing pressure, the second end of the sensing rod extends into the inner cavity, and the sensing rod is elastically supported on the shell along the first direction; the measuring rod is positioned in the inner cavity, the first end of the measuring rod is abutted against the second end of the sensing rod, the measuring rod is elastically supported on the shell along a second direction, and the second direction is opposite to the first direction; the control module is arranged on the shell and can control the measuring rod to move along a first direction; the trigger assembly is arranged on the shell and can send a control signal to the control module when the induction rod moves. The utility model provides a pressure transmitter measurement accuracy is high.

Description

Pressure transmitter

Technical Field

The utility model relates to a pressure measurement device field particularly, relates to a pressure transmitter.

Background

The pressure transmitter is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry and the like.

Pressure transmitters in general consist primarily of a load cell sensor (also referred to as a pressure sensor), measurement circuitry, and process connections. The pressure sensor can convert physical pressure parameters of gas, liquid and the like sensed by the pressure element sensor into standard electric signals to be supplied to secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation.

At present, an electrical component of a pressure transmitter for sensing pressure is generally a resistance strain gauge, which is a sensing component for converting pressure on a measured object into an electrical signal, but the accuracy of the pressure transmitter is low due to the influence of sensing accuracy of the resistance strain gauge and accuracy of an amplifying circuit.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pressure transmitter to solve the lower technical problem of current pressure transmitter's precision.

The utility model provides a pressure transmitter, include shell, response pole, measuring stick, control module and trigger the subassembly.

The shell is provided with an inner cavity, and the shell is provided with a measuring port communicated with the inner cavity.

The sensing rod is inserted into the measuring port and matched with the measuring port, the first end of the sensing rod is used for sensing pressure, the second end of the sensing rod extends into the inner cavity, and the sensing rod is elastically supported on the shell along the first direction.

The measuring rod is located in the inner cavity, a first end of the measuring rod abuts against a second end of the induction rod, the measuring rod is elastically supported on the shell along a second direction, and the second direction is opposite to the first direction.

The control module is mounted on the shell and can control the measuring rod to move along the first direction.

The trigger assembly is arranged on the shell and can send a control signal to the control module when the induction rod moves.

Furthermore, the trigger assembly comprises a light emitting module and a light absorbing module which are oppositely arranged, a light absorbing block is fixedly arranged at the first end of the measuring rod, and the light emitting module and the light absorbing module are respectively arranged at two sides of the light absorbing block; along the second direction, the radial cross-sectional area of the light absorption block is gradually increased; the light absorption module is electrically connected with the control module; the measuring rod is connected with the sensing rod in an abutting mode through the light absorption block.

The pressure transmitter further comprises a partition board, the partition board separates the inner cavity into a measurement cavity and a circuit cavity, the sensing rod and the measurement rod are both arranged in the measurement cavity, the control module comprises a circuit board, and the circuit board is arranged in the circuit cavity; the light absorption module is electrically connected with the circuit board.

Further, the control module comprises a coil and a permanent magnet, the coil is fixedly connected with the measuring rod, the permanent magnet is relatively and fixedly arranged with the shell, and the permanent magnet is arranged around the coil; the coil is electrically connected with the circuit board.

Further, pressure transmitter still includes magnetic isolation sheet, magnetic isolation sheet is located the permanent magnet with between the circuit board.

Further, pressure transmitter still includes the display screen, the display screen with the control module electricity is connected, the display screen install in the circuit chamber, just the information that the display screen shows can see through the shell.

Furthermore, the induction rod comprises a rod body and a piston fixedly sleeved on the rod body, and the induction rod is matched with the measuring port through the piston.

Further, the body of rod is fixed and is provided with first supporting seat, the body of rod cover is equipped with first spring, the one end of first spring with the interior terminal surface butt of shell, the other end with first supporting seat butt.

Furthermore, the pressure transmitter also comprises a limiting sheet, the limiting sheet is fixedly arranged on the inner peripheral wall of the shell, and the measuring rod penetrates through the limiting sheet; the measuring rod is fixedly provided with a second supporting seat, the measuring rod is sleeved with a second spring, one end of the second spring is abutted against the limiting piece, and the other end of the second spring is abutted against the second supporting seat; the second spring and the coil are respectively arranged on two sides of the limiting sheet.

Further, the terminal surface part of shell outwards extends and forms the erection joint, erection joint cavity sets up, the well cavity of erection joint forms measure the mouth, the response pole with it is used for restricting the relative pivoted limit structure of the two circumference to measure to be provided with between the mouth.

The utility model discloses beneficial effect that pressure transmitter brought is:

the pressure transmitter is provided with a shell, an induction rod elastically supported on the shell along a first direction, a measuring rod elastically supported on the shell along a second direction opposite to the first direction, a control module and a trigger assembly which are both arranged on the shell, wherein the shell is provided with an inner cavity and a measuring port communicated with the inner cavity; the induction rod is inserted into the measuring port and matched with the measuring port, the first end of the induction rod is used for sensing the fluid pressure, and the second end of the induction rod extends into the inner cavity; the measuring rod is arranged in the inner cavity, and the first end of the measuring rod is abutted against the second end of the induction rod; the control module can drive the measuring rod to move along the first direction.

When the pressure transmitter is used, when pressure exists outside, the first end of the induction rod is pushed to move along the second direction, so that the measuring rod is driven to move along the second direction; in the process of moving the induction rod, the trigger assembly receives a corresponding signal, so that a control signal is sent to the control module, and the control module is used for controlling the measuring rod to move along a first direction; when the measuring rod moves to the initial position, the pressure value can be obtained through conversion according to the current value output by the control module at the moment, and pressure measurement is achieved.

Above-mentioned in-process because the response pole supports in the shell along first direction elasticity, and the measuring stick supports in the shell along the second direction for at the in-process of measuring ambient pressure, the response pole can remain the butt state with the measuring stick all the time. And after the control module controls the measuring rod to move to the initial position, the elastic potential energy between the sensing rod and the shell is the same as the elastic potential energy between the sensing rod and the shell at the initial position, and the elastic potential energy between the measuring rod and the shell is the same as the elastic potential energy between the measuring rod and the shell at the initial position, so that the pressure value obtained by directly converting the current value output by the control module is the external pressure, and the measuring precision is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural diagram of a pressure transmitter provided in an embodiment of the present invention;

fig. 2 is a left side view of the pressure transmitter according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a light-absorbing block of a pressure transmitter according to an embodiment of the present invention.

Description of reference numerals:

1-a housing; 11-installing a joint; 12-a measurement cavity; 13-a circuit cavity; 2-a piston; 21-an induction rod; 22-measuring rod; 23-a first support; 3-a light absorbing block; 4-a light emitting module; 5-a light absorbing module; 61-a coil; 62-a permanent magnet; 7-a circuit board; 71-a display screen; 8-magnetism isolating sheet; 9-first spring.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a schematic cross-sectional structural diagram of the pressure transmitter provided in this embodiment. As shown in fig. 1, the present embodiment provides a pressure transmitter, which includes a housing 1, an induction rod 21, a measurement rod 22, a control module, and a trigger assembly, specifically, the housing 1 has an inner cavity, and the housing 1 is provided with a measurement port communicated with the inner cavity; the induction rod 21 is inserted into the measuring port and matched with the measuring port, a first end of the induction rod 21 is used for sensing pressure, a second end of the induction rod 21 extends into the inner cavity, and the induction rod 21 is elastically supported on the shell 1 along a first direction; the measuring rod 22 is located in the inner cavity, the first end of the measuring rod 22 abuts against the second end of the sensing rod 21, the measuring rod 22 is elastically supported on the shell 1 along a second direction, and the second direction is opposite to the first direction; the control module is arranged on the shell 1 and can control the measuring rod 22 to move along a first direction; the trigger component is arranged on the shell 1 and can send a control signal to the control module when the induction rod 21 moves.

When the pressure transmitter is used, when pressure exists outside, the first end of the induction rod 21 is pushed to move along the second direction, so that the measuring rod 22 is driven to move along the second direction; in the process of moving the induction rod 21, the trigger assembly receives a corresponding signal, so as to send a control signal to the control module, and the control module is used for controlling the measuring rod 22 to move along the first direction; when the measuring rod 22 moves to the initial position, the pressure value can be obtained by conversion according to the current value output by the control module at the moment, and the pressure measurement is realized.

In the above process, since the sensing rod 21 is elastically supported on the housing 1 along the first direction and the measuring rod 22 is supported on the housing 1 along the second direction, the sensing rod 21 and the measuring rod 22 can always be kept in the abutting state in the process of measuring the external pressure. Moreover, after the control module controls the measuring rod 22 to move to the initial position, the elastic potential energy between the sensing rod 21 and the housing 1 is the same as the elastic potential energy between the sensing rod 21 and the housing 1 at the initial position, and the elastic potential energy between the measuring rod 22 and the housing 1 is the same as the elastic potential energy between the measuring rod 22 and the housing 1 at the initial position, so that the pressure value obtained by directly converting the current value output by the control module is the external pressure, and the measuring precision is high.

It should be noted that the "first direction" refers to a direction from right to left in fig. 1, and the "second direction" refers to a direction from left to right in fig. 1.

Referring to fig. 1, in the present embodiment, the sensing rod 21 includes a rod body and a piston 2 fixedly sleeved on the rod body, and the sensing rod 21 is matched with the measuring port through the piston 2.

The structural form that the piston 2 is matched with the measuring port is utilized, so that when the induction rod 21 is machined, only the matching precision of the piston 2 and the measuring port is ensured, and the machining cost of the induction rod 21 is reduced.

Fig. 2 is a left side view of the pressure transmitter provided in the present embodiment. Referring to fig. 1 and fig. 2, in this embodiment, an end surface of the housing 1 partially extends outward to form the installation joint 11, specifically, the installation joint 11 is hollow, a hollow cavity of the installation joint 11 forms a measurement port, and a limit structure for limiting circumferential relative rotation between the sensing rod 21 and the measurement port is disposed between the sensing rod and the measurement port.

When there is pressure from the outside, the sensing lever 21 will only move relative to the housing 1 and will not rotate in the housing 1. So set up, reduced the pressure loss of external pressure drive response pole 21 removal in-process for the pressure value that finally surveys is more accurate, has further improved this embodiment pressure transmitter's measurement accuracy.

In addition, by providing the mounting joint 11 on the housing 1, the connection between the housing 1 and other components is facilitated, thereby facilitating the mounting of the pressure transmitter of the present embodiment.

Referring to fig. 2, in the present embodiment, the radial cross section of the piston 2 is hexagonal, and correspondingly, the radial cross section of the hollow cavity of the installation joint 11 is also hexagonal.

Fig. 3 is a schematic structural diagram of the light absorption block 3 of the pressure transmitter provided in this embodiment. Referring to fig. 1 and fig. 3, in this embodiment, the triggering assembly includes a light emitting module 4 and a light absorbing module 5, which are oppositely disposed, wherein the first end of the measuring rod 22 is fixedly disposed with the light absorbing block 3, and the light emitting module 4 and the light absorbing module 5 are respectively disposed at two sides of the light absorbing block 3; along the second direction, the radial section area of the light absorption block 3 is gradually increased; the light absorption module 5 is electrically connected with the control module; the measuring rod 22 abuts against the sensing rod 21 via the light absorption block 3.

With reference to fig. 1, when the external pressure pushes the sensing rod 21 to move rightward, the measuring rod 22 will move rightward under the driving action of the sensing rod 21 because the measuring rod 22 abuts against the sensing rod 21 through the light absorption block 3; during the process that the measuring rod 22 moves rightwards, the light absorption block 3 blocks the light emitting module 4 to be gradually reduced, so that the light absorption module 5 can gradually receive the light emitted by the light emitting module 4; when the light absorption module 5 receives the light emitted by the light emission module 4, a control signal is sent to the control module to drive the measuring rod 22 to move to the left to the initial position.

The arrangement form of the trigger component realizes the triggering of the control module by using the light intensity change in the moving process of the measuring rod 22, and the trigger component has reliable triggering and simple structure.

Referring to fig. 3, in the present embodiment, the light absorption block 3 is in a trapezoid shape.

Referring to fig. 1, in the present embodiment, the pressure transmitter may further include a partition board, where the partition board separates the inner cavity into a measurement cavity 12 and a circuit cavity 13, specifically, the sensing rod 21 and the measurement rod 22 are both disposed in the measurement cavity 12, the control module includes a circuit board 7, and the circuit board 7 is disposed in the circuit cavity 13; the light absorption module 5 is electrically connected to the circuit board 7.

Through set up the baffle in shell 1, utilize the baffle to separate the inner chamber for two mutually independent spaces to the realization is deposited alone circuit board 7, has avoided the corrosive action that external fluid caused circuit board 7 effectively, thereby has prolonged this embodiment pressure transmitter's working life.

Referring to fig. 1, in the present embodiment, the control module includes a coil 61 and a permanent magnet 62, specifically, the coil 61 is fixedly connected to the measuring rod 22, the permanent magnet 62 is fixedly disposed opposite to the housing 1, and the permanent magnet 62 is disposed around the coil 61. Wherein the coil 61 is electrically connected to the circuit board 7.

In this embodiment, the Circuit Board 7 is a PCB (Printed Circuit Board). The circuit board 7 is provided with an I/V conversion circuit and a PID (proportional integral derivative) adjusting circuit, the circuit board 7 is further provided with a low-pass filter circuit, a data acquisition circuit and a microprocessor, specifically, the low-pass filter circuit, the data acquisition circuit and the microprocessor are electrically connected, the I/V conversion circuit and the PID adjusting circuit are electrically connected, and the low-pass filter circuit and the PID adjusting circuit are electrically connected with the coil 61.

When the light absorption module 5 receives light emitted by the light emission module 4, the PID adjusting circuit controls the coil 61 to generate current, after the coil 61 generates current, repulsive force is generated between the permanent magnet 62 and the coil 61 to push the coil 61 to move leftward, so that the measuring rod 22 is driven to move leftward, the light absorption block 3 is restored to the original position, the low-pass filter circuit and the data acquisition circuit acquire current values in the coil 61 at the time, and the microprocessor converts the pressure value sensed by the induction rod 21 according to the current values acquired by the data acquisition circuit.

The arrangement mode of driving the measuring rod 22 by using the electromagnetic structure is simple in structure and reliable in driving.

Referring to fig. 1, in the present embodiment, the pressure transmitter may further include a magnetism isolating sheet 8, specifically, the magnetism isolating sheet 8 is located between the permanent magnet 62 and the circuit board 7.

By arranging the magnetism isolating sheet 8 between the permanent magnet 62 and the circuit board 7, the interference of the magnetic field to the circuit board 7 is effectively weakened, so that the working reliability of the circuit board 7 is ensured, and the measurement precision of the pressure transmitter is further improved.

Referring to fig. 1, in the present embodiment, the pressure transmitter may further include a display screen 71, specifically, the display screen 71 is electrically connected to the control module, the display screen 71 is installed in the circuit cavity 13, and information displayed by the display screen 71 can pass through the housing 1.

Through set up display screen 71 in pressure transmitter for the pressure information that obtains through pressure transmitter measurement can show on display screen 71, and the staff of being convenient for directly reads data, has improved this embodiment pressure transmitter's use convenience.

In other embodiments, the display screen 71 may be embedded in the outer surface of the housing 1, and the display screen 71 may be subjected to waterproof and anticorrosive treatments. It is sufficient that the pressure measured can be displayed by the display screen 71.

Referring to fig. 1, in the present embodiment, a first supporting seat 23 is fixedly disposed on a rod body of the sensing rod 21, a first spring 9 is sleeved on the rod body, one end of the first spring 9 abuts against the inner end surface of the housing 1, and the other end abuts against the first supporting seat 23. So set up, not only realized induction rod 21 and shell 1 along the elastic connection of first direction, moreover, can also realize spacing first spring 9, prevent that first spring 9 from droing from induction rod 21.

Referring to fig. 1, in the present embodiment, the pressure transmitter may further include a limiting sheet, specifically, the limiting sheet is fixedly disposed on the inner peripheral wall of the housing 1, and the measuring rod 22 penetrates through the limiting sheet; the measuring rod 22 is fixedly provided with a second supporting seat, and the measuring rod 22 is sleeved with a second spring, wherein one end of the second spring is abutted with the limiting piece, and the other end of the second spring is abutted with the second supporting seat; the second spring and the coil 61 are respectively arranged at two sides of the limiting sheet. So set up, not only realized measuring stick 22 and shell 1 along the elastic connection of second direction, moreover, can also realize spacing to the second spring, prevent that the second spring from droing from measuring stick 22.

In this embodiment, the partition and the circuit cavity 13 may be made into an integral structure, so that the measurement cavity 12 has an opening at the right portion, and then the circuit cavity 13 and the measurement cavity 12 are connected by using a detachable connection structure. So set up, be convenient for dismantle the maintenance to pressure transmitter, reduced the maintenance cost.

The principle and process of measuring pressure using the pressure transmitter are as follows.

When the pressure transmitter is used, the light emitting module 4 is electrified to emit a light beam, the light beam penetrates through the light absorbing block 3, is partially absorbed by the light absorbing block 3 and then irradiates the light absorbing module 5, and the microprocessor measures the light intensity received by the light absorbing module 5 through the I/V conversion circuit.

When pressure exists outside, the pressure pushes the piston 2 to move rightwards, so that the induction rod 21 is driven to move rightwards; in the process that the induction rod 21 moves rightwards, the light absorption block 3 abutted with the first support seat 23 moves rightwards, at the moment, the thickness of the position, irradiated on the light absorption block 3, of the light beam emitted by the light emitting module 4 changes, the light intensity received by the light absorption module 5 is enhanced, and therefore the control module is triggered; after the control module is triggered, the coil 61 is controlled by the PID adjusting circuit to generate current, after the coil 61 generates current, the coil 61 is pushed to move leftwards under the action of the repulsive force of the permanent magnet 62 and the coil 61, so that the light absorption block 3 is restored to the original position, the low-pass filter circuit and the data acquisition circuit acquire the current value in the coil 61 at the moment, the microprocessor converts the current value acquired by the data acquisition circuit to obtain an external pressure value, and the pressure value is displayed on the display screen 71.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the above embodiments, descriptions of orientations such as "up", "down", "left", "right", and the like are based on the drawings.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A pressure transmitter, comprising:

the device comprises a shell (1) with an inner cavity, wherein the shell (1) is provided with a measuring port communicated with the inner cavity; the induction rod (21) is inserted into the measuring port and matched with the measuring port, a first end of the induction rod (21) is used for sensing pressure, a second end of the induction rod (21) extends into the inner cavity, and the induction rod (21) is elastically supported on the shell (1) along a first direction;

the measuring rod (22) is located in the inner cavity, a first end of the measuring rod (22) abuts against a second end of the induction rod (21), the measuring rod (22) is elastically supported on the shell (1) along a second direction, and the second direction is opposite to the first direction;

a control module mounted to the housing (1), the control module being capable of controlling the movement of the measuring rod (22) in the first direction; and

the trigger assembly is arranged on the shell (1) and can send a control signal to the control module when the induction rod (21) moves.

2. The pressure transmitter of claim 1, wherein the trigger assembly comprises a light emitting module (4) and a light absorbing module (5) which are oppositely arranged, a light absorbing block (3) is fixedly arranged at a first end of the measuring rod (22), and the light emitting module (4) and the light absorbing module (5) are respectively arranged at two sides of the light absorbing block (3); the radial cross-sectional area of the light absorption block (3) is gradually increased along the second direction; the light absorption module (5) is electrically connected with the control module; the measuring rod (22) is abutted to the induction rod (21) through the light absorption block (3).

3. Pressure transmitter according to claim 2, characterized in that it further comprises a partition which separates said inner cavity into a measurement chamber (12) and a circuit chamber (13), said sensing rod (21) and said measuring rod (22) being arranged in said measurement chamber (12), said control module comprising a circuit board (7), said circuit board (7) being arranged in said circuit chamber (13); the light absorption module (5) is electrically connected with the circuit board (7).

4. Pressure transmitter according to claim 3, characterized in that the control module comprises a coil (61) and a permanent magnet (62), the coil (61) being fixedly connected with the measuring rod (22), the permanent magnet (62) being fixedly arranged opposite the housing (1), the permanent magnet (62) being arranged around the coil (61); the coil (61) is electrically connected to the circuit board (7).

5. Pressure transmitter according to claim 4, characterized in that it further comprises a magnetism-isolating sheet (8), said magnetism-isolating sheet (8) being located between said permanent magnet (62) and said circuit board (7).

6. Pressure transmitter according to claim 4, characterized in that it further comprises a display screen (71), said display screen (71) being electrically connected to said control module, said display screen (71) being mounted to said circuit cavity (13) and said display screen (71) displaying information through said housing (1).

7. Pressure transmitter according to any of claims 1 to 6, characterized in that said sensing rod (21) comprises a rod body and a piston (2) fixed to said rod body, said sensing rod (21) being fitted to said measuring port through said piston (2).

8. Pressure transmitter according to claim 7, characterized in that said rod body is fixedly provided with a first support seat (23), said rod body is sleeved with a first spring (9), one end of said first spring (9) is abutted with the inner end face of said housing (1), and the other end is abutted with said first support seat (23).

9. The pressure transmitter according to any one of claims 4-6, further comprising a limiting sheet fixedly disposed on an inner peripheral wall of the housing (1), wherein the measuring rod (22) is disposed through the limiting sheet; a second supporting seat is fixedly arranged on the measuring rod (22), a second spring is sleeved on the measuring rod (22), one end of the second spring is abutted against the limiting piece, and the other end of the second spring is abutted against the second supporting seat; the second spring and the coil (61) are respectively arranged on two sides of the limiting sheet.

10. The pressure transmitter according to any one of claims 1-6, wherein the end surface of the housing (1) partially extends outward to form a mounting joint (11), the mounting joint (11) is hollow, the hollow cavity of the mounting joint (11) forms the measuring port, and a limiting structure for limiting circumferential relative rotation between the sensing rod (21) and the measuring port is arranged between the sensing rod and the measuring port.

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