CN210195996U

CN210195996U - Constant temperature control device for syringe

Info

Publication number: CN210195996U
Application number: CN201920391302.4U
Authority: CN
Inventors: Shukai Li; 李树凯; Xiaorui Chen; 陈筱芮; Jiaxiang Deng; 邓嘉祥
Original assignee: Maxtor Dimensional Precision Instrument Manufacturing Co Ltd Of Hebei
Current assignee: Maxtor Dimensional Precision Instrument Manufacturing Co Ltd Of Hebei
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-03-27
Anticipated expiration: 2029-03-26

Abstract

The utility model relates to an injector thermostatic control device, a serial communication port, include: the syringe comprises a syringe needle cylinder, a syringe end cap, a push rod and a piston, wherein the syringe end cap is arranged at the top end of the syringe needle cylinder, the outer wall of the piston is provided with at least two sealing layers along the circumferential direction, the piston is connected with the inner wall of the syringe cylinder of the injector in an airtight way through the sealing layers, the bottom end of the piston is provided with a piston assembly part, the piston assembly part is sleeved and connected with the top end of the push rod, the push rod is hollow, the temperature control component is fixedly connected with the interface board, and set up in inside the cavity of push rod, the accuse temperature subassembly passes through push rod control piston temperature, the utility model discloses showing the low temperature weeping that improves current syringe existence, the problem that high temperature life descends, having solved injection pressure and descend along with the temperature drop, improving syringe performance uniformity, stability, prolonged life, have extensive popularization prospect.

Description

Constant temperature control device for syringe

Technical Field

The utility model relates to a syringe thermostatic control device.

Background

In the prior art, a syringe pump is a common apparatus for uniformly or precisely dosing liquid or gas, a syringe is an important component of such syringe pumps, and the tightness of the fit between a piston and a syringe housing determines the injection precision, accuracy and injection pressure of the syringe pump, thereby affecting the final result.

For the existing syringes and injection pumps, glass is mostly used as the syringe shell, and polytetrafluoroethylene polymer or high molecular polyethylene and other materials are used for manufacturing the piston, and the materials have good chemical stability, corrosion resistance, wear resistance, heat resistance and excellent sealing and lubricating properties, and are the most extensive sealing materials for manufacturing syringe components. However, because of the large coefficient of linear thermal expansion (about 10X 10-5/DEG C-12X 10-5/DEG C) of polymer materials such as polytetrafluoroethylene, the size of the syringe piston made of the polymer materials is sensitive to temperature changes, so that the operating temperature of the syringe pump made of the syringe piston is generally limited to the range of 15-40 ℃. In this range, the size of the piston deforms linearly with temperature, so that the maximum injection pressure generated by the injection pump decreases linearly with the decrease of temperature, and if the ambient temperature is lower than 15 ℃, the edge of the piston of the whole injector will form a gap due to the shrinkage of the piston material, thereby generating leakage. In addition, the friction force between the piston and the shell of the injector can be increased along with the rise of the temperature, thereby causing the phenomenon of accelerated aging of the injector. Therefore, the problems of low-temperature liquid leakage and high-temperature service life reduction commonly exist in the existing injection pump. Accordingly, there is a need for improvements and optimizations to these existing syringes and syringe pumps. The utility model discloses a syringe piston subassembly and including its syringe pump in the utility model of mandate notice No. CN204428551U, the date of mandate notice is 2015 7/1, avoids the thermal expansion problem of polytetrafluoroethylene material through set up one or more O type sealing washer on polytetrafluoroethylene piston outer wall, and it also explains that polytetrafluoroethylene material has better chemical stability, corrosion-resistant, wearability, heat resistance and good sealed and lubricating property in its article, is the broadest sealing material of preparation syringe subassembly. Therefore, the scheme is to replace the low-temperature sealing characteristic by a method of reducing the chemical property and the service life of the piston, and has certain limitation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an injector thermostatic control device is showing the low temperature weeping that improves current injector, the problem that the high temperature life-span descends, and is sealed effectual, and job stabilization scope is big to solved the problem that injection pressure descends along with the temperature decline, improve the uniformity and the stability of performance.

In order to realize the purpose, the utility model discloses a technical scheme is:

an injector thermostatic control device, comprising: the syringe comprises a syringe needle cylinder, a syringe end cap, a push rod and a piston;

the temperature control device comprises a push rod, a syringe needle cylinder, a syringe end cap, a piston assembly part, a temperature control assembly and an interface board, wherein the syringe end cap is arranged at the top end of the syringe needle cylinder, at least two sealing layers are arranged on the outer wall of the piston along the circumferential direction, the piston is hermetically connected with the inner wall of the syringe needle cylinder through the sealing layers, the bottom end of the piston is provided with the piston assembly part, the piston assembly part is connected to the top end of the push rod in a sleeved mode, the interior of the push rod is hollow, the.

The syringe thermostatic control device, wherein: the piston is made of polytetrafluoroethylene polymer or high-molecular polyethylene.

The syringe thermostatic control device, wherein: the push rod is made of metal with good heat conductivity, such as stainless steel, copper, aluminum and the like.

The syringe thermostatic control device, wherein: the temperature control assembly comprises a temperature sensor, a heating device and a control element, and the temperature sensor and the heating device are respectively electrically connected with the control element.

The utility model has the advantages that: the utility model discloses showing the low temperature weeping that improves current syringe and exist, the problem that high temperature life descends has solved injection pressure and has descended along with the temperature drop, improves syringe performance uniformity, stability, has prolonged life, has extensive popularization prospect.

Drawings

Fig. 1 is a perspective view of a syringe thermostatic control device.

Fig. 2 is a front view of the syringe thermostat control device.

Fig. 3 is a side view of the syringe thermostat control device.

FIG. 4 is a sectional view of the syringe thermostat control device.

Description of reference numerals: 1-syringe cylinder; 2-syringe end cap; 3-a push rod; 4-a piston; a temperature control assembly; 6-an interface board; 7-piston assembly.

Detailed Description

An injector thermostatic control device as shown in fig. 1-4, comprising: syringe barrel 1, syringe end cap 2, plunger 3 and piston 4.

The top end of the syringe needle cylinder 1 is provided with the syringe end cap 2, the outer wall of the piston 4 is provided with at least two sealing layers along the circumferential direction, the piston 4 is hermetically connected with the inner wall of the syringe needle cylinder 1 through the sealing layers, the bottom end of the piston 4 is provided with a piston assembling part 7, the piston assembling part 7 is connected to the top end of the push rod 3 in a sleeved mode, the push rod 3 is hollow, the temperature control assembly 5 is fixedly connected with the interface board 6 and arranged in the hollow inner part of the push rod 3, and the temperature control assembly 5 controls the temperature of the piston 4 through the push rod 3.

The piston 4 is made of polytetrafluoroethylene polymer or high-molecular polyethylene.

The push rod 3 is made of metal with good thermal conductivity, such as stainless steel, copper, aluminum and the like.

The temperature control assembly 5 comprises a temperature sensor, a heating device and a control element, wherein the temperature sensor and the heating device are respectively electrically connected with the control element.

In the embodiment, the piston 4 is made of a polymer material such as polytetrafluoroethylene polymer or high molecular polyethylene, and has a large linear expansion coefficient (about 10 × 10-5/DEG C to 12 × 10-5/DEG C), and the environmental temperature during the precision machining of the piston 4 is controlled within the working temperature range, so that the size of the piston 4 is ensured not to be deformed by the temperature change, and the working temperature range is 5-40 ℃.

Firstly, required liquid is pumped into the syringe needle cylinder 1, the temperature of the piston 4 can be conducted into the temperature sensor through the piston assembly part 7, whether the temperature of the piston 4 is within a required working range is determined, if the temperature is lower than the required temperature, the heating device arranged in the push rod 3 is started and starts to heat through the control element, the heating device transmits the generated heat into the piston 4 through the push rod 3, the temperature of the piston 4 is sensed through the temperature sensor in real time, when the temperature of the piston 4 reaches the required temperature, the heating device arranged in the push rod 3 is closed through the control element and stops heating, the piston 4 is always kept within the working temperature range, and the problem that the piston 4 expands with heat and contracts with cold when exceeding the working temperature range is solved, solves the problems of low temperature liquid leakage and long service life at high temperature.

The utility model has the advantages that:

the utility model discloses showing the low temperature weeping that improves current syringe and exist, the problem that high temperature life descends has solved injection pressure and has descended along with the temperature drop, improves syringe performance uniformity, stability, has prolonged life, has extensive popularization prospect.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An injector thermostatic control device, comprising: the device comprises a syringe needle cylinder (1), a syringe end cap (2), a push rod (3) and a piston (4);

the top of syringe cylinder (1) sets up syringe end cap (2), piston (4) outer wall sets up at least twice sealing layer along circumference, piston (4) pass through the sealing layer with syringe cylinder (1) inner wall airtight connection, the bottom of piston (4) sets up piston assembly portion (7), piston assembly portion (7) suit connect in the top of push rod (3), push rod (3) are inside to be cavity, accuse temperature subassembly (5) and interface board (6) fixed connection, and set up in the cavity of push rod (3) is inside, accuse temperature subassembly (5) pass through push rod (3) control piston (4) temperature.

2. A thermostatic injector control device as set forth in claim 1 wherein: the piston (4) is made of polytetrafluoroethylene polymer or high-molecular polyethylene.

3. A thermostatic injector control device as set forth in claim 1 wherein: the push rod (3) is made of metal with good heat conductivity, such as stainless steel, copper, aluminum and the like.

4. A thermostatic injector control device as set forth in claim 1 wherein: the temperature control assembly (5) comprises a temperature sensor, a heating device and a control element, wherein the temperature sensor and the heating device are respectively electrically connected with the control element.