Pressure transmitter for pressure control of homogenizer

Abstract

The utility model relates to the technical field of pressure monitoring, and provides a pressure transmitter for pressure control of a homogenizer, which comprises a shell and a signal processing module. The shell comprises an upper shell body and a lower shell body, the lower end of the upper shell body is arranged at the upper end of the lower shell body in a sleeving mode, a corrugated pipe is connected between the upper end of the lower shell body and the inner wall of the upper shell body, and a zero clearing switch is installed on the upper shell body. The signal processing module is installed in the upper shell, a communication interface is installed at the upper end of the upper shell, a pressure sensor is embedded in the lower end of the lower shell, and the pressure sensor is electrically connected with the signal processing module through a spring wire. According to the technical scheme, the corrugated pipe is connected between the upper shell and the lower shell, so that the buffer protection effect is achieved, and the system pressure monitoring is more stable; the service life is prolonged; the problems that in the prior art, a pressure gauge displays large pressure jump and has impact force on the pressure gauge are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure monitoring technical field, specifically, relate to a pressure transmitter for pressure control of homogenizer. BACKGROUND

[0002] At present, the homogenizer is an important equipment widely used in food processing, pharmaceutical, chemical industry and other industries, and its main function is to make materials reach uniform fine particle state through high pressure homogenization treatment.

[0003] The pressure control is a very important index in the homogenization process of the homogenizer, and unstable pressure control can seriously affect the homogenization quality of the materials, and at present, most of them still stay in the use of mechanical pressure gauge or ordinary pressure gauge for pressure control.

[0004] But the deficiency that has in the above technical scheme using ordinary pressure gauge has: the pressure generated by the reciprocating motion of the plunger of the homogenizer is very unstable, and has a certain impact force on the pressure gauge; and the pressure measured by the pressure gauge is almost an average value or the display pressure fluctuation is large, the pressure value is unstable, and the value is not the pressure value required by the homogenizer. CONTENT OF THE UTILITY MODEL

[0005] The utility model provides a pressure transmitter for pressure control of homogenizer, solve the problem that the pressure gauge of a kind of pressure transmitter for pressure control of homogenizer in relevant technology shows pressure fluctuation is large, and have the impact force to pressure gauge.

[0006] The technical scheme of the utility model is as follows:

[0007] A kind of pressure transmitter for pressure control of homogenizer, including shell and signal processing module;

[0008] The shell includes upper shell and lower shell, the lower end of the upper shell is sleeved on the upper end of the lower shell, the upper end of the lower shell is connected with the inner wall of the upper shell by corrugated pipe, and the upper shell is provided with a zero reset switch;

[0009] The signal processing module is installed in the upper shell, a communication interface is installed on the upper end of the upper shell, a pressure sensor is embedded in the lower end of the lower shell, and the pressure sensor is electrically connected with the signal processing module by spring wire.

[0010] In a preferred mode of the utility model, the upper shell inner wall and the lower shell outer wall are provided with a gap, the upper end of the corrugated pipe is fixed with the inner wall of the upper shell, and the lower end of the corrugated pipe is fixed with the upper end of the lower shell.

[0011] In a preferred mode of the utility model, the lower shell lower end is equipped with a limiting groove, the limiting groove is inserted with a mounting joint, the mounting joint outer surface is equipped with a protruding rubber ring, the rubber ring is fixed with the lower shell lower end, and the pressure sensor is fixed at the mounting joint end.

[0012] In a preferred mode of the utility model, the lower shell outer surface is equipped with a nut, the nut inner ring is equipped with an internal thread, the lower shell outer surface is equipped with a clamping groove, the clamping groove is clamped with a limiting clasp spring, and the limiting clasp spring is limitedly arranged at the nut inner ring bottom.

[0013] In a preferred mode of the utility model, the nut edge is outwardly extended and is provided with a rim, the rim surface is equipped with a mounting hole, a plurality of mounting holes are arranged along the rim at equal angles, and the mounting hole is a strip-shaped groove.

[0014] In a preferred mode of the utility model, the zero clearing switch is embedded in the upper shell side wall, the zero clearing switch is a magnetic control switch or a touch control switch, the communication interface supports RS485 or CAN bus communication protocol, can realize seamless connection with the control system of the homogenizer, and can realize real-time transmission of pressure data; the measurement accuracy of the pressure sensor is ±0.1% FS, and the response time is less than 5ms.

[0015] In a preferred mode of the utility model, the pressure sensor is a strain pressure sensor or a piezoelectric ceramic sensor, a high-sensitivity piezoelectric ceramic sensor is adopted, is used for detecting the pressure change in the homogenizer, can realize real-time sensing of the pressure change, and converts the pressure signal into an electric signal; the strain pressure sensor has the characteristics of high sensitivity and strong anti-interference ability.

[0016] In a preferred mode of the utility model, the signal processing module adopts an embedded processor, can realize real-time processing and storage of the pressure signal, the signal processing module includes an amplifying circuit, a filtering circuit and an analog-digital conversion circuit, is used for processing the electric signal output by the sensor, and improves the signal-to-noise ratio and accuracy of the signal.

[0017] In a preferred mode of the utility model, the amplifying circuit is used for amplifying the pressure signal and converting it into a measurable electric signal, the amplifying circuit adopts an operational amplifier, and the operational amplifier is used for amplifying the weak signal output by the sensor;

[0018] The filtering circuit adopts a low-pass filter, removes high-frequency noise through the low-pass filter, and improves the signal-to-noise ratio of the signal; the analog-digital conversion circuit converts the processed analog signal into a digital signal, which is convenient for computer processing.

[0019] In a preferred mode of the utility model, still include display device and control module, the display device is used for showing pressure value, the control module is used for receiving pressure signal and realizes pressure control to homogenizer, the display device is liquid crystal display, the display device is fixed on the upper shell outer surface, the control module can realize man-machine dialogue and parameter setting through man-machine interface.

[0020] The utility model discloses working principle and beneficial effect are:

[0021] 1, the utility model discloses, connect bellows between upper shell and lower shell, can isolate most of the influence of the vibration to upper shell through the bellows isolation lower shell connected seismic source, set up rubber ring can be sealed contact with the interface inner wall of homogenizer and play the role of sealing, can also buffer offset the pressure difference amplitude of homogenizer high-low pressure conversion process to the impact of pressure sensor, play the role of buffer protection, make that system pressure monitoring is more stable, and prolong service life.

[0022] 2, realize the closed loop control of pressure through pressure transmitter, so after pressure measurement, signal processing is carried out, and a signal output proportional to pressure value is output, such as 4-20mA, this signal can input signal processing module and other instruments, and pressure data is transmitted to PLC control system through signal processing module to control the output power of motor, also can convert this signal into pressure value and send to display screen to display, so that not only can the pressure size be seen, but also the purpose of closed loop control can be achieved through pressure. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further explained in detail in combination with the drawings and specific embodiment.

[0024] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0025] Fig. 2 It is the main view structure schematic diagram of the utility model;

[0026] Fig. 3 It is the cut open structure schematic diagram of the utility model;

[0027] In the drawing: 100, shell;110, upper shell;130, lower shell;131, limit slot;133, mounting joint;135, rubber ring;137, limit clasp;150, bellows;170, clear switch;190, nut;191, rim;193, mounting hole;300, signal processing module;310, communication interface;330, pressure sensor;350, spring wire. SPECIFIC EMBODIMENT

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor are involved in the protection scope of the utility model.

[0029] Embodiments

[0030] As Figs. 1-3 shown, the embodiment provides a pressure transmitter for pressure control of a homogenizer, which comprises a shell 100 and a signal processing module 300.

[0031] The shell 100 comprises an upper shell 110 and a lower shell 130, the lower end of the upper shell 110 is sleeved on the upper end of the lower shell 130, a bellows 150 is connected between the upper end of the lower shell 130 and the inner wall of the upper shell 110, and the upper shell 110 is provided with a zero clearing switch 170.

[0032] The signal processing module 300 is installed in the upper shell 110, a communication interface 310 is installed on the upper end of the upper shell 110, a pressure sensor 330 is embedded on the lower end of the lower shell 130, and the pressure sensor 330 is electrically connected with the signal processing module 300 through a spring wire 350.

[0033] The algorithm filters out stable data meeting the production requirements of the homogenizer from the changing pressure values, converts the pressure into an analog signal (4-20mA) for output, feeds back to the control system of the equipment, the system adjusts the pressure according to the feedback signal, and controls the pressure in the latest state; the pressure sensor 330 will produce zero drift after long time use, and the zero clearing switch 170 can be used for zero clearing.

[0034] In the embodiment, the upper shell 110 and the lower shell 130 are arranged with a gap, the upper end of the bellows 150 is fixed to the inner wall of the upper shell 110, and the lower end of the bellows 150 is fixed to the upper end of the lower shell 130.

[0035] In the embodiment, the lower end of the lower shell 130 is provided with a limiting groove 131, the limiting groove 131 is inserted with a mounting connector 133, the outer surface of the mounting connector 133 is sleeved with a protruding rubber ring 135, the rubber ring 135 is fixed to the lower end of the lower shell 130, and the pressure sensor 330 is fixed to the end of the mounting connector 133.

[0036] In the embodiment, the outer surface of the lower shell 130 is sleeved with a nut 190, an inner thread is formed in the inner circle of the nut 190, and a limit clamping spring 137 is clamped at the clamping groove formed on the outer surface of the lower shell 130, and the limit clamping spring 137 is arranged at the bottom of the inner circle of the nut 190.

[0037] In the embodiment, the edge of the nut 190 extends outward to be provided with a rim 191, the surface of the rim 191 is provided with a mounting hole 193, a plurality of mounting holes 193 are arranged at equal angles along the circumference of the rim 191, and the mounting hole 193 is a strip-shaped groove.

[0038] In the embodiment, the zero clearing switch 170 is embedded in the side wall of the upper shell 110, the zero clearing switch 170 is a magnetic control switch or a touch control switch, the communication interface 310 supports RS485 or CAN bus communication protocol, can realize seamless connection with the control system of the homogenizer, and realizes real-time transmission of pressure data; the measurement accuracy of the pressure sensor 330 is ±0.1%FS, and the response time is less than 5ms.

[0039] In the embodiment, the pressure sensor 330 is a strain pressure sensor or a piezoelectric ceramic sensor, a high-sensitivity piezoelectric ceramic sensor is adopted, which is used for detecting the pressure change in the homogenizer, can realize real-time sensing of the pressure change, and converts the pressure signal into an electric signal; the strain pressure sensor has the characteristics of high sensitivity and strong anti-interference ability.

[0040] In the embodiment, the signal processing module 300 adopts an embedded processor, can realize real-time processing and storage of the pressure signal, the signal processing module 300 includes an amplifying circuit, a filtering circuit and an analog-digital conversion circuit, which are used for processing the electric signal output by the sensor, and improving the signal-to-noise ratio and accuracy of the signal.

[0041] In the embodiment, the amplifying circuit is used for amplifying the pressure signal and converting it into a measurable electric signal, and an operational amplifier is adopted in the amplifying circuit to amplify the weak signal output by the sensor;

[0042] The filtering circuit adopts a low-pass filter to remove high-frequency noise and improve the signal-to-noise ratio of the signal; and the analog-digital conversion circuit converts the processed analog signal into a digital signal for computer processing.

[0043] In the embodiment, a display device and a control module are further included, the display device is used for displaying the pressure value, the control module is used for receiving the pressure signal and realizing pressure control of the homogenizer, the display device is a liquid crystal display, the display device is fixed on the outer surface of the upper shell 110, and the control module can realize man-machine dialogue and parameter setting through a man-machine interaction interface.

[0044] When the homogenizer works, the pressure sensor 330 senses the pressure change in real time and transmits the pressure data to the PLC control system through the signal processing module 300. The control system adjusts the working parameters of the homogenizer according to the pressure data to ensure the stability of pressure control;

[0045] 1. The pressure sensor 330 converts the physical pressure into a voltage signal, which is small and in the order of millivolts. The millivolt level is amplified by the preamplifier of the signal processing module 300;

[0046] 2. The amplified pressure analog signal is input into an analog-to-digital converter to convert the analog signal into a digital signal;

[0047] 3. The MCU (TI single-chip microcomputer) of the signal processing module 300 processes the pressure digital signal at a high speed, collecting 500 data in one second;

[0048] 4. According to the working characteristics of the homogenizer, the pressurization process is realized by the reciprocating motion of the plunger to generate pressure. When the plunger moves forward, the liquid is rapidly compressed, which causes the pressure to rise rapidly. When the plunger moves backward, the pressure will drop rapidly. According to this feature, a software algorithm is designed to process the data collected by the MCU continuously, eliminate some useless data, and retain useful data, so as to obtain a stable digital signal;

[0049] 5. The MCU converts the stable digital signal into a pressure value through a proportional algorithm, and then converts the pressure value into a PWM output;

[0050] 6. The PWM is input into a PWM conversion 4-20mA circuit. In this circuit, through filtering, integration, and amplification, a 4-20 output signal is obtained;

[0051] 7. The transmitter will have a certain zero drift after long-term use, which can be cleared through the zero clear switch 170.

[0052] The accuracy of the pressure transmitter is 0.25%; more than 50 effective pressure values per second are fed back, making the system pressure more stable; the service life is 3-5 times that of ordinary pressure gauges.

[0053] By adding a shielding layer and grounding design, electromagnetic interference is effectively suppressed; at the same time, a vibration isolation structure is adopted to reduce the influence of mechanical vibration on the sensor.

[0054] And the pressure sensor 330 is installed on the homogenizer, when the pressure exceeds the rated value, the pressure sensor 330 transmits the signal to the signal processing module 300, and transmits the pressure data to the PLC control system through the signal processing module 300 to control the machine to stop; Ensure the safety of the use process, prevent the equipment damage or safety accident caused by the pressure being too high.

[0055] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure transmitter for pressure control of a homogenizer, characterized in that, include The outer casing (100) includes an upper casing (110) and a lower casing (130). The lower end of the upper casing (110) is fitted onto the upper end of the lower casing (130). A bellows (150) is connected between the upper end of the lower casing (130) and the inner wall of the upper casing (110). A zeroing switch (170) is installed on the upper casing (110). A signal processing module (300) is installed inside the upper housing (110). A communication interface (310) is installed on the upper end of the upper housing (110) and is electrically connected to the signal processing module (300). A pressure sensor (330) is embedded in the lower end of the lower housing (130) and is electrically connected to the signal processing module (300) via a spring wire (350).

2. The pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The inner wall of the upper housing (110) is separated from the outer wall of the lower housing (130). The upper end of the corrugated pipe (150) is fixed to the inner wall of the upper housing (110), and the lower end of the corrugated pipe (150) is fixed to the upper end of the lower housing (130).

3. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The lower housing (130) has a limiting groove (131) at its lower end. A mounting connector (133) is inserted into the limiting groove (131). A protruding rubber ring (135) is fitted on the outer surface of the mounting connector (133). The rubber ring (135) is fixed to the lower end of the lower housing (130). The pressure sensor (330) is fixed to the end of the mounting connector (133).

4. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The outer surface of the lower housing (130) is fitted with a nut (190), the inner ring of the nut (190) is provided with an internal thread, and a limiting snap ring (137) is engaged at the slot on the outer surface of the lower housing (130), the limiting snap ring (137) is positioned at the bottom of the inner ring of the nut (190).

5. A pressure transmitter for pressure control of a homogenizer according to claim 4, characterized in that, The nut (190) has an edge (191) extending outward from its edge. The surface of the edge (191) has mounting holes (193). Multiple mounting holes (193) are provided at equal angles along the circumference of the edge (191).

6. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The zeroing switch (170) is embedded in the side wall of the upper housing (110). The zeroing switch (170) is a touch switch. The communication interface (310) supports RS485 or CAN bus communication protocols. The pressure sensor (330) has a measurement accuracy of ±0.1%FS and a response time of less than 5ms.

7. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The pressure sensor (330) is a strain gauge pressure sensor used to detect pressure changes inside the homogenizer. It can sense pressure changes in real time and convert pressure signals into electrical signals.

8. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, The signal processing module (300) employs an embedded processor and includes an amplifier circuit, a filter circuit, and an analog-to-digital converter circuit.

9. A pressure transmitter for pressure control of a homogenizer according to claim 8, characterized in that, The amplification circuit is used to amplify the pressure signal and convert it into a measurable electrical signal. The amplification circuit is an operational amplifier. The filtering circuit is a low-pass filter. The analog-to-digital converter circuit converts the processed analog signal into a digital signal.

10. A pressure transmitter for pressure control of a homogenizer according to claim 1, characterized in that, It also includes a display device and a control module; the display device is a liquid crystal display, which is fixed on the outer surface of the upper housing (110), and the control module realizes human-machine dialogue and parameter setting through a human-machine interface.

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