CN211935053U - Automatic pressure calibration device for injection pump - Google Patents
Automatic pressure calibration device for injection pump Download PDFInfo
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- CN211935053U CN211935053U CN202020069210.7U CN202020069210U CN211935053U CN 211935053 U CN211935053 U CN 211935053U CN 202020069210 U CN202020069210 U CN 202020069210U CN 211935053 U CN211935053 U CN 211935053U
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- injection pump
- pressure sensor
- sleeve
- calibration device
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Abstract
The utility model discloses an automatic pressure calibration device for an injection pump, which comprises a pressure detection unit fixed on a host of the injection pump and a mandril component connected with one end of the pressure detection unit and butted with a pushing head of the injection pump; the pressure detection unit comprises a first pressure sensor and a control display component connected with the first pressure sensor; the ejector rod assembly comprises a sleeve and an ejector rod penetrating in the sleeve; a second pressure sensor is arranged on the push head; and the two opposite ends of the ejector rod are respectively abutted against the first pressure sensor and the second pressure sensor. The utility model discloses an injection pump pressure automatic calibration device for carry out pressure calibration, pressure detection to the injection pump, easy operation, the precision is high, and calibration efficiency is high and convenient to carry.
Description
Technical Field
The utility model relates to a pressure calibrating device especially relates to an injection pump pressure automatic calibration device.
Background
Syringe pumps are medical devices that are used in a wide variety of medical and industrial instrumentation. In the process that the injection pump pushes the injector to realize the stable liquid infusion through the mechanical device of the injection pump, the injection pump has higher requirements on the pressure of injection liquid in the injector, so that a pressure sensor is arranged in the position of the push head of the injection pump and used for detecting the pressure of the liquid in the injector, and the pressure sensor on the push head usually needs a calibration process to realize higher precision requirements.
The general pressure detection and calibration method is as follows: and filling water into the syringe injector, connecting the water outlet end with a digital pressure gauge through an extension pipe, and completing pressure detection and calibration according to corresponding steps and procedures. The above method has the following disadvantages: (1) the syringe injectors are required to be frequently replaced in the pressure detection process, so that waste is caused, and if the syringe injectors are not replaced, the friction force of the inner wall of each syringe injector is increased, so that the measurement error is larger; (2) the calibration time is long, and the production efficiency is low; (3) is not convenient to carry.
Therefore, there is a need to design a portable device for automatic pressure calibration and pressure detection of a syringe pump, which solves the problems of long time consumption, large error caused by friction force of a syringe injector, waste of the syringe injector, low production efficiency, inconvenience in carrying and the like in the above calibration and measurement.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing an injection pump pressure automatic calibration device convenient to carry, calibration are efficient.
The utility model provides a technical scheme that its technical problem adopted is: the automatic pressure calibration device for the injection pump comprises a pressure detection unit fixed on a host machine of the injection pump, and a mandril assembly connected to one end of the pressure detection unit and abutted against a pushing head of the injection pump;
the pressure detection unit comprises a first pressure sensor and a control display component connected with the first pressure sensor; the ejector rod assembly comprises a sleeve and an ejector rod penetrating in the sleeve; a second pressure sensor is arranged on the push head; and the two opposite ends of the ejector rod are respectively abutted against the first pressure sensor and the second pressure sensor.
Preferably, the pressure detecting unit further includes a cylindrical housing;
the control display assembly comprises a circuit board and a battery which are arranged in the cylindrical shell, and a display screen which is arranged on the cylindrical shell; the battery and the display screen are both connected with the circuit board; the first pressure sensor is arranged on the end part of the cylindrical shell facing the push head and is connected with the circuit board.
Preferably, one end of the sleeve is connected with one end of the cylindrical shell in a matching manner, and the first pressure sensor is sleeved in the sleeve; the opposite other end of the sleeve extends towards the pushing head direction;
the ejector rod penetrates through the sleeve, the first end of the ejector rod is abutted to the first pressure sensor, and the opposite second end of the ejector rod extends out of the other end of the sleeve to be abutted to the second pressure sensor on the push head.
Preferably, one end of the cylindrical shell facing the pushing head is an open end; the pressure detection unit further comprises a fixed seat axially connected to the open end of the cylindrical shell, and the first pressure sensor is arranged on the end face, facing the push head, of the fixed seat.
Preferably, the sleeve comprises a first barrel section and a second barrel section which are axially connected; the first cylinder section is connected with the cylinder-shaped shell in a matched mode, the second cylinder section faces the push head, and the outer diameter of the second cylinder section is smaller than that of the first cylinder section.
Preferably, the ejector rod comprises a rod body and a top cover with the diameter larger than the outer diameter of the rod body; the rod body is arranged in the sleeve in a penetrating mode, and the first end face of the rod body is abutted to the first pressure sensor; the top cover is arranged at the end part of the second end of the rod body and positioned outside the sleeve, and the top cover is abutted to the second pressure sensor on the push head.
Preferably, the ejector rod assembly further comprises an elastic sheet arranged on the second end face of the ejector rod.
Preferably, the pressure detection unit further includes at least one function button disposed on the cylindrical housing and connected to the circuit board.
Preferably, the pressure detection unit further includes at least one interface provided on the cylindrical housing and connected to the circuit board.
Preferably, the sleeve is a metal sleeve, and the ejector rod is a metal rod; and the matching surface between the sleeve and the ejector rod is a smooth surface.
The utility model discloses an injection pump pressure automatic calibration device for carry out pressure calibration, pressure detection to the injection pump, easy operation, the precision is high, and calibration efficiency is high and convenient to carry.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural view of an automatic calibration device for pressure of an injection pump according to an embodiment of the present invention, which is mounted on the injection pump;
fig. 2 is a schematic cross-sectional structure diagram of an automatic calibration device for pressure of an injection pump according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the automatic calibration device for pressure of injection pump of an embodiment of the present invention is used for assembling the injection pump, and the pushing head 2 of the injection pump is used for performing pressure calibration on the injection pump. The automatic calibration device 3 for the pressure of the injection pump comprises a pressure detection unit 10 fixed on a main machine 1 of the injection pump and a push rod assembly 20 connected to one end of the pressure detection unit 10 and abutted against a push head 2 of the injection pump.
The pressure detection unit 10 includes a first pressure sensor 11, and a control display component connected to the first pressure sensor 11. The push rod assembly 20 comprises a sleeve 21 and a push rod 22 arranged in the sleeve 21 in a penetrating mode. A second pressure sensor is arranged on the pushing head 2; opposite ends of the jack 22 abut against the first pressure sensor 11 and the second pressure sensor, respectively. When the push head 2 is actuated to press the push rod 22, the push rod 22 presses the first pressure sensor 11 at the same time, the pressure detected by the second pressure sensor on the push head 2 is equal to the pressure detected by the first pressure sensor 11, and the pressure value detected by the first pressure sensor 11 can be displayed and known through the control display component, so that the pressure value detected by the first pressure sensor on the push head 2 can be obtained.
Specifically, in the pressure detection unit 10, the control display component may include a circuit board 12, a battery 13 connected to the circuit board 12(PCBA), and a display 14, and the battery 13 supplies power to the display 14 through the circuit board 12. The first pressure sensor 11 is connected to the circuit board 12, and transmits the detected signal to the circuit board 12, and the signal is processed by the circuit board 12 and displayed on the display screen 14. The display screen 14 may be an LCD screen.
The pressure detecting unit 10 further includes a cylindrical housing 15. The circuit board 12 and the battery 13 are both arranged in the cylindrical shell 15, and the display screen 14 is arranged on the cylindrical shell 15 and exposed out for convenient viewing. According to the arrangement of the inner space of the cylindrical shell 15, the circuit board 12, the battery 13 and the display screen 14 can be fixed in the cylindrical shell 15 through the supports respectively, so that reasonable arrangement is realized and displacement is avoided.
The first pressure sensor 11 is provided at an end of the cylindrical case 15 facing the pusher 2 so as to abut against the plunger 22.
In this embodiment, the cylindrical case 15 is a case having one open end and the other closed end. The cylindrical housing 15 faces the pusher 2 with an open end. The first pressure sensor 11 may be mounted on the open end of the cylindrical housing 15.
In order to close the tubular housing 15 as a whole, the pressure detecting unit 10 further comprises a fixed seat 16 axially connected to the open end of the tubular housing 15, the engagement of the fixed seat 16 on the open end being able to close it. The first pressure sensor 11 is arranged on the end face of the fixed seat 16 facing the push head 2.
Further, the pressure detecting unit 10 further includes at least one function button 17 provided on the cylindrical housing 15 and connected to the circuit board 12. The function keys 17 include a switch function key, a display mode switching key, and the like.
The pressure detecting unit 10 further includes at least one interface (not shown) provided on the cylindrical housing 15 and connected to the circuit board 12. The interface comprises at least one of a charging interface, a communication interface and the like. The circuit board 12 may further be provided with a wireless connection module, and the wireless and/or wired connection between the syringe pump pressure automatic calibration device and the syringe pump control system is realized through the wireless module and/or the interface, and the interface may be an RS232 interface, an RS485 interface, or the like.
In the push rod assembly 20, one end of the sleeve 21 is connected to an end of the cylindrical housing 15 in a fitting manner, so as to sleeve the first pressure sensor 11 therein, and the opposite end of the sleeve 21 extends toward the push head 2. The ejector rod 22 is arranged in the sleeve 21 in a penetrating mode, a first end of the ejector rod abuts against the first pressure sensor 11, and the other end, extending out of the sleeve 21, of the opposite second end of the ejector rod abuts against the second pressure sensor on the push head 2.
Specifically, the sleeve 21 may include a first barrel section 211 and a second barrel section 212 that are axially contiguous. The first cylindrical section 211 is connected to the cylindrical housing 15. The open end of the cylindrical shell 15 is provided with a fixed seat 16, and the first cylindrical section 211 is further connected with the fixed seat 16, so that the cylindrical shell 15, the fixed seat 16 and the first cylindrical section 211 are sequentially connected in the axial direction.
The second cylinder section 212 faces the pushing head 2 and has an outer diameter smaller than that of the first cylinder section 211. The ejector rod 22 penetrates through the sleeve 21, and two ends of the ejector rod respectively extend out of the first cylinder section 211 and the second cylinder section 212 and respectively abut against the first pressure sensor 11 and the second pressure sensor.
The stem 22 may include a shaft 221 and a cap 222 having a diameter greater than the outer diameter of the shaft 221. The rod body 221 is arranged in the sleeve 21 in a penetrating way, the first end of the rod body 221 forms the first end of the ejector rod 22, and the end surface of the first end is abutted with the first pressure sensor 11; the cap 222 is disposed on the second end of the rod 221, forming a second end of the plunger 22 with the second end. The top cover 222 is located outside the sleeve 21 and abuts against the second pressure sensor on the pusher head 2.
The push rod assembly 20 further includes an elastic piece 23 disposed on the second end surface of the push rod 22 for buffering. The elastic sheet 23 may be made of polyurethane or the like.
During operations such as pressure calibration, the top cover 222 of the push rod 22 abuts against the second pressure sensor of the push head 2, so that the elastic piece 23 is specifically disposed on the end surface of the top cover 222 facing the push head 2.
The utility model discloses an injection pump pressure automatic calibration device, for guaranteeing that the pressure value that first pressure sensor 11 detected such as pressure calibration equals the pressure value that second pressure sensor detected on the pushing head 2, frictional force between ejector pin 22 and the sleeve 21 needs very little to can neglect. Therefore, in order to make the friction between the carrier rod 22 and the sleeve 21 very small to be negligible, the mating surface between the two needs to be smooth. Preferably, the sleeve 21 and the ram 22 are made of metal, respectively a metal sleeve and a metal rod. Since the sleeve 21 and the ram 22 are made of metal, the mating surfaces between the two can be configured to form smooth surfaces.
Further, the sleeve 21 is fitted with the outer peripheral surface of the jack 22 mainly by the stepped surfaces 24 formed convexly inside the ports at the opposite ends thereof, and the inner passage of the sleeve 21 located between the stepped surfaces 24 inside the two ends can be fitted without contact with the outer peripheral surface of the jack 22 (i.e., with a gap formed), so that the fitting surface of the sleeve 21 fitted with the jack 22 is mainly the stepped surface 24 of the port, and a smooth surface is formed on the inner side surface of the stepped surface 24.
The utility model discloses an injection pump pressure automatic calibration device installs on the injection pump during the use. Starting injection, wherein the push head 2 acts to press the first pressure sensor 11 through the push rod 22, and the pressure value detected by the first pressure sensor 11 is also equal to the pressure value (equal in size and opposite in direction) detected by the second pressure sensor on the push head 2; the display screen 14 on the automatic calibration device for the pressure of the injection pump displays the pressure value detected by the second pressure sensor on the push head 2 in real time, and transmits the detected pressure value to the control system of the injection pump in a wired or wireless manner, the control system acquires the pressure values transmitted by the automatic calibration device for the N groups of injection pumps and acquires N groups of ADC values of the push head pressure sensor, and by a linear fitting method, the relationship y between the ADC value of the push head pressure sensor and the real pressure is kx + b, for example: y 12.118x + 769.28. Wherein k is 12.118, which indicates that the pressure sensor in the syringe pump head changes 12.118 ADC values each time it receives 1kpa of pressure; 769.28, the ADC value is equal to 769.28 when the pressure sensor in the syringe pump push head is subjected to a pressure value of 0 kpa.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. The automatic pressure calibration device for the injection pump is characterized by comprising a pressure detection unit and a push rod assembly, wherein the pressure detection unit is fixed on a host machine of the injection pump;
the pressure detection unit comprises a first pressure sensor and a control display component connected with the first pressure sensor; the ejector rod assembly comprises a sleeve and an ejector rod penetrating in the sleeve; a second pressure sensor is arranged on the push head; and the two opposite ends of the ejector rod are respectively abutted against the first pressure sensor and the second pressure sensor.
2. The injection pump pressure auto-calibration device according to claim 1, wherein the pressure detection unit further comprises a cylindrical housing;
the control display assembly comprises a circuit board and a battery which are arranged in the cylindrical shell, and a display screen which is arranged on the cylindrical shell; the battery and the display screen are both connected with the circuit board; the first pressure sensor is arranged on the end part of the cylindrical shell facing the push head and is connected with the circuit board.
3. The automatic calibration device for pressure in injection pump according to claim 2, wherein one end of the sleeve is engaged with one end of the cylindrical housing to house the first pressure sensor therein; the opposite other end of the sleeve extends towards the pushing head direction;
the ejector rod penetrates through the sleeve, the first end of the ejector rod is abutted to the first pressure sensor, and the opposite second end of the ejector rod extends out of the other end of the sleeve to be abutted to the second pressure sensor on the push head.
4. The automatic calibration device for pressure of injection pump according to claim 3, wherein the end of said cylindrical housing facing said pushing head is an open end; the pressure detection unit further comprises a fixed seat axially connected to the open end of the cylindrical shell, and the first pressure sensor is arranged on the end face, facing the push head, of the fixed seat.
5. The automatic injection pump pressure calibration device of claim 3 wherein the sleeve comprises first and second axially contiguous barrel sections; the first cylinder section is connected with the cylinder-shaped shell in a matched mode, the second cylinder section faces the push head, and the outer diameter of the second cylinder section is smaller than that of the first cylinder section.
6. The automatic calibration device for pressure of injection pump according to claim 3, wherein said plunger comprises a rod body and a top cover having a diameter larger than the outer diameter of said rod body; the rod body is arranged in the sleeve in a penetrating mode, and the first end face of the rod body is abutted to the first pressure sensor; the top cover is arranged at the end part of the second end of the rod body and positioned outside the sleeve, and the top cover is abutted to the second pressure sensor on the push head.
7. The injection pump pressure autocalibration device according to claim 3, wherein the ram assembly further includes an elastic piece provided on the second end face of the ram.
8. The automatic calibration device for pressure in injection pump according to claim 2, wherein said pressure detection unit further comprises at least one function button disposed on said cylindrical housing and connected to said circuit board.
9. The automatic calibration device for pressure in an injection pump according to claim 2, wherein the pressure detection unit further comprises at least one interface disposed on the cylindrical housing and connected to the circuit board.
10. The automatic calibration device for pressure of injection pump according to any of claims 1-9, wherein the sleeve is a metal sleeve, and the ejector rod is a metal rod; and the matching surface between the sleeve and the ejector rod is a smooth surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020069210.7U CN211935053U (en) | 2020-01-13 | 2020-01-13 | Automatic pressure calibration device for injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020069210.7U CN211935053U (en) | 2020-01-13 | 2020-01-13 | Automatic pressure calibration device for injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211935053U true CN211935053U (en) | 2020-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020069210.7U Active CN211935053U (en) | 2020-01-13 | 2020-01-13 | Automatic pressure calibration device for injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211935053U (en) |
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2020
- 2020-01-13 CN CN202020069210.7U patent/CN211935053U/en active Active
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