CN115724387A - Closed constant-pressure control tank for filling - Google Patents

Abstract

The invention discloses a closed constant-pressure control tank for filling, which is used for metering and filling liquid preparations and comprises: the tank bottom pressure sensor is used for detecting the internal pressure information of liquid in the liquid storage tank; the tank top liquid level sensor is used for detecting liquid level information in the liquid storage tank; the fourteenth switching valve is arranged on a steam, water and liquid medicine inlet pipeline and is used for controlling the liquid medicine inlet amount according to liquid level information; the second switch valve is arranged on the clean compressed air inlet pipeline; the electric proportional valve is arranged on the clean compressed air inlet pipeline and used for controlling the second switch valve to be switched on and off according to the internal pressure information of the liquid, and the cavity in the upper part of the liquid level in the liquid storage tank is supplemented with air or decompressed to realize constant-pressure filling. Compared with the prior art, the invention can realize accurate filling metering, online cleaning and online sterilization, and is convenient to use.

Description

Closed constant-pressure control tank for filling

Technical Field

The invention belongs to the technical field of filling equipment, and particularly relates to a closed constant-pressure control tank for filling.

Background

The filling part is a key part on a filling machine in the production process of liquid preparation medicines in the pharmaceutical industry, and the filling mode, the accurate metering, the cleaning and the disinfection are convenient to use, so that the technical problem of important attention in the filling production of the liquid preparation in the pharmaceutical industry is solved.

The filling mode of the existing large-capacity and small-capacity liquid filling machine is generally negative pressure type, gravity flow type, piston pump (glass pump/stainless steel metal pump/ceramic pump) type or peristaltic pump type filling. The method specifically comprises the following steps: in the existing negative pressure type filling mode, a vacuum negative pressure technology is adopted, a negative pressure loop is formed by sealing a bottle opening to extract liquid medicine for filling, and the filling amount is controlled by adjusting the filling liquid level height of a packaging container. The existing gravity-flow filling mode has the disadvantages that a liquid storage tank runs in an unsealed mode, liquid level fluctuation is large due to liquid inlet impact, the change of the self-weight pressure value of liquid medicine in the tank is large, filling error control is not accurate, a large amount of filling tail liquid exists at last, liquid medicine waste is serious, and the liquid storage tank and a filling pipeline can only be statically cleaned on line and statically sterilized on line. The existing piston pump type filling mode adopts a mechanical transmission mode to control the movement stroke of a piston rod in a piston pump so as to control the filling metering, and has a complex transmission structure and inconvenient adjustment; the cleaning and the disinfection are carried out after the pump body and the pipeline are disassembled, the online cleaning and the disinfection can not be realized, and the use is convenient. The existing peristaltic pump type filling mode adopts the mode of controlling the number of turns of the rotor of the pump head to control the filling metering, and the cleaning and the disinfection of the filling pump are also carried out after the pump head and a pipeline are disassembled, so that the online cleaning and the disinfection can not be realized, and the use is convenient.

Therefore, the existing liquid filling device has the following defects due to the defects of the self filling pipeline structure and the metering mode: the filling amount error is large, and tail liquid remains, so that waste of liquid medicine is caused; the online cleaning can not be realized or the online cleaning effect is not good, and the use is inconvenient.

Disclosure of Invention

Technical problem to be solved

Based on the technical scheme, the invention provides a closed constant-pressure control tank for filling, and aims to solve the technical problems of large filling error, waste of liquid medicine and poor cleaning effect of the conventional liquid filling device.

(II) technical scheme

In order to solve the above technical problems, the present invention provides a closed constant pressure control tank for filling, which is used for metering and filling a liquid preparation, and comprises: the tank bottom pressure sensor is arranged below the inner part of the liquid storage tank and used for detecting the internal pressure information of liquid in the liquid storage tank; the tank top liquid level sensor is arranged above the inside of the liquid storage tank and is used for detecting liquid level information in the liquid storage tank; the fourteenth switching valve is arranged on a steam, water and liquid medicine inlet pipeline connected with the liquid storage tank and is used for controlling the liquid medicine inlet amount according to the liquid level information; the second switch valve is arranged on a clean compressed air inlet pipeline connected with the liquid storage tank; the electric proportional valve is also located on the clean compressed air inlet pipeline, just the electric proportional valve is used for the basis liquid internal pressure information, control the second switch valve switch, in order to right liquid tank inner liquid level upper portion cavity carries out tonifying qi or pressure release, in order to realize the constant voltage filling.

Preferably, the lower part of liquid storage pot is equipped with the filling house steward, the filling house steward is connected with a plurality of filling heads, every all be equipped with a filling ooff valve between filling head and the liquid storage pot.

Preferably, the closed constant-pressure control tank for filling further comprises a sterilizing head and a cleaning pipeline, each filling head is correspondingly provided with one sterilizing head, one end of each sterilizing head is provided with a clamping sleeve used for being clamped with the filling head, the other end of each sterilizing head is an outlet end communicated with the cleaning pipeline, and the cleaning pipeline is provided with a seventh switch valve; the top of the liquid storage tank is communicated with the steam, water and liquid medicine inlet pipeline through a cleaning ball of the liquid storage tank and a third switch valve.

Preferably, the washing and sterilizing unit further comprises a sixth switch valve and a direct connecting pipe connected with the liquid storage tank and the washing pipeline, wherein a fifth switch valve is arranged on the direct connecting pipe, and each outlet end of the sterilizing head is communicated with the washing pipeline through the sixth switch valve.

Preferably, the closed constant voltage control jar is used in the filling still includes the foam recovery unit, the foam recovery unit includes that the foam retrieves jar, foam absorption house steward and tenth ooff valve, every the upper portion of filling head all through foam absorption house steward, tenth ooff valve with the foam is retrieved jar intercommunication, the foam is retrieved the unit and is still including being used for retrieving the evacuation subassembly of jar evacuation and locating to the foam the fifteenth ooff valve of foam recovery tank bottom, still be equipped with vacuum pressure table on the foam recovery jar.

Preferably, an air filter is arranged between the electric proportional valve and the second switch valve, and a first switch valve is arranged between the air filter and the electric proportional valve.

Preferably, the closed constant-pressure control tank for filling further comprises a steam sterilization drain pipeline, and the air filter is further communicated with the steam sterilization drain pipeline through a twelfth switch valve, an eighth switch valve and a drain valve in sequence.

Preferably, the bottom of the foam recovery tank is communicated with the steam sterilization drain pipeline through a recovery tank drain pipe, and a ninth switch valve is arranged on the recovery tank drain pipe; the drain pipe of the recovery tank is also communicated with the cleaning pipeline; the top of the foam recovery tank is communicated with the steam, water and liquid medicine inlet pipeline through a recovery tank cleaning ball and a fourth switch valve.

Preferably, the vacuumizing assembly comprises a water circulation vacuumizing system connected with the foam recovery tank, an eleventh switch valve is arranged between the foam recovery tank and the water circulation vacuumizing system, a vacuum regulating valve is arranged between the eleventh switch valve and the water circulation vacuumizing system, and the water circulation vacuumizing system comprises a water pump cooling water discharge pipeline.

Preferably, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, the sixth switch valve, the seventh switch valve, the eighth switch valve, the ninth switch valve, the tenth switch valve, the eleventh switch valve and the twelfth switch valve are all pneumatic diaphragm valves, a thirteenth switch valve is arranged on the steam, water and liquid medicine inlet pipeline, and the thirteenth switch valve is a manual diaphragm valve; the fourteenth switch valve is a PID control pneumatic diaphragm valve; the outlet of the cleaning pipeline and the outlet of the steam sterilization drain pipeline are both provided with ball valves, and the steam, water and liquid medicine inlet pipeline, the filling main pipe, the foam absorption main pipe and the steam sterilization drain pipeline are all provided with temperature sensors; and the liquid storage tank is also provided with a pressure sensor.

(III) advantageous effects

Compared with the prior art, the closed constant-pressure control tank for filling has the following advantages:

when the closed constant-pressure control tank for filling is used for filling liquid, liquid level air pressure can be formed above the liquid level of the liquid storage tank, liquid level liquid inlet impact fluctuation is reduced by the liquid level air pressure, the comprehensive pressure value of the liquid at the bottom of the tank body is ensured to be constant, and the filling quantity can be accurately controlled. In addition, the closed constant-pressure control tank for filling can realize the constant comprehensive pressure value of the liquid at the bottom of the tank body, and when the liquid level is lowered at the final stage of filling, the electric proportional valve at the upper part of the liquid level controls the second switch valve to be opened so as to supplement air to the cavity at the upper part of the liquid level in the liquid storage tank, so that the liquid medicine in the tank body can be ensured to be completely filled, no residual tail liquid exists, and the waste of the liquid medicine is reduced. During the use, only need the liquid filling time of every filling head of accurate adjustment on the operation screen, just can control the accurate filling measurement of every filling head, large capacity and small capacity liquid filling machine all can use, and application scope is wide, and the stable performance is reliable, is convenient for realize control and regulation. In addition, the invention can realize on-line cleaning and on-line sterilization, and is convenient to use.

Drawings

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

Fig. 1 is a schematic view of the overall structure of the present invention.

Description of the drawings:

100. pure steam, purified water and liquid medicine input ends, 200 clean compressed air input ends, 1, a first switch valve, 2, a second switch valve, 3, a third switch valve, 4, a fourth switch valve, 5, a fifth switch valve, 6, a sixth switch valve, 7, a seventh switch valve, 8, an eighth switch valve, 9, a ninth switch valve, 10, a tenth switch valve, 11, an eleventh switch valve, 12, a twelfth switch valve, 13, a thirteenth switch valve, 14, a fourteenth switch valve, 15, a fifteenth switch valve, 16, a liquid storage tank, 17, a tank bottom pressure sensor, 18, a tank top liquid level sensor, 19, an electric proportional valve, 20, steam, water and liquid medicine inlet pipelines, 21, a clean compressed air inlet pipeline, 22, a filling main pipe, 23, a filling head, 24, a filling switch valve, 25, a sterilizing head, 26, a cleaning pipeline, 27, a liquid storage tank cleaning ball, 28, a straight connecting pipe, 29, a foam recovery tank, 30, a foam absorption main pipe, 31, a vacuum pressure gauge, 32, an air filter, 33, a drain valve, 34, a recovery tank drain pipe, 35, a recovery tank cleaning ball, 36, a water circulation vacuum pumping system, 37, a vacuum adjusting valve, 38, a water pump cooling water discharge pipeline, 39, a ball valve, 40, a temperature sensor, 41, a pressure sensor, 42, a steam sterilization drain pipeline and 43, a liquid inlet pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

The enclosed constant pressure control tank for filling of the present invention will be further described with reference to fig. 1.

The invention discloses a closed constant-pressure control tank for filling, which is used for metering and filling liquid preparations and comprises: the liquid storage tank comprises a liquid storage tank 16, a tank bottom pressure sensor 17, a tank top liquid level sensor 18, a fourteenth switch valve 14, a second switch valve 2 and an electric proportional valve 19, wherein the tank bottom pressure sensor 17 is arranged below the inner part of the liquid storage tank 16 and is used for detecting the internal pressure information of the liquid in the liquid storage tank 16; the tank top level sensor 18 is arranged above the interior of the liquid storage tank 16 and is used for detecting the liquid level information in the liquid storage tank 16; the fourteenth switch valve 14 is arranged on a steam, water and liquid medicine inlet pipeline 20 connected with the liquid storage tank 16, and the fourteenth switch valve 14 is used for controlling the liquid medicine inlet amount according to the liquid level information; the second switch valve 2 is arranged on a clean compressed air inlet pipeline 21 connected with the liquid storage tank 16; the electric proportional valve 19 is also arranged on the clean compressed air inlet pipeline 21, and the electric proportional valve 19 is used for controlling the second switch valve 2 to be switched on and off according to the internal pressure information of the liquid so as to supplement air or release pressure to the cavity at the upper part of the liquid level in the liquid storage tank 16 and realize constant-pressure filling.

More specifically, the fourteenth switching valve 14 is a PID-controlled pneumatic diaphragm valve. It should be noted that the PID-controlled pneumatic diaphragm valve is a PID pneumatic regulating valve, specifically a PID-controlled pneumatic diaphragm valve, which uses an intelligent process controller to realize the function of self-adjusting position and flow.

The closed constant-pressure control tank for filling is particularly suitable for metering and filling of liquid preparations in the pharmaceutical industry. Wherein: the pure steam, purified water and liquid medicine input end 100 is used for inputting pure steam or purified water or liquid medicine, and the clean compressed air input end is used for inputting clean compressed air.

In use, a filling head 23 is connected to the lower portion of the reservoir 16. During filling, a high-precision liquid level controller (tank top liquid level sensor 18), a pneumatic diaphragm proportional valve (fourteenth switch valve 14) for liquid inlet, a pneumatic proportional valve (PID controlled electrical proportional valve 19) for feeding clean compressed air and a tank bottom pressure sensor 17 for feeding back pressure are combined to realize precise control, liquid level air pressure is formed above the liquid level of the liquid storage tank 16, liquid level impact fluctuation is reduced by the liquid level air pressure, and the liquid comprehensive pressure value (the sum of the self-weight pressure of liquid in the tank and the clean compressed air pressure on the upper part of the liquid in the tank) at the bottom of the tank is ensured to be constant, so that the liquid pressure value circulating in a filling pipeline communicating the filling heads 23 is ensured to be stable and constant, and only on an operation screen is needed, the liquid filling time of each filling head 23 is accurately adjusted, and the precise filling metering of each filling head 23 can be controlled. Therefore, the closed constant-pressure control tank for filling in the embodiment can be applied to liquid filling machines with various capacities, has wide application range and stable and reliable performance, and can be conveniently controlled and adjusted.

In addition, the closed constant-pressure control tank for filling can realize the constant comprehensive pressure value of the liquid at the bottom of the tank body, and when the liquid level is lowered at the final stage of filling, the electric proportional valve 19 at the upper part of the liquid level controls the second switch valve 2 to be opened so as to supplement air to the cavity at the upper part of the liquid level in the liquid storage tank 16, thereby ensuring that the liquid medicine in the tank body is completely filled without residual tail liquid and reducing the waste of the liquid medicine.

According to an embodiment of the present invention, the lower portion of the reservoir 16 is provided with a filling manifold 22, the filling manifold 22 is connected to a plurality of filling heads 23, and a filling on-off valve 24 is provided between each filling head 23 and the reservoir 16.

More specifically, the filling on-off valve 24 is a pneumatic diaphragm valve.

More specifically, in the present embodiment, 10 filling heads 23 are connected to the lower portion of the reservoir tank 16. In this embodiment, through setting up a plurality of filling heads 23, can realize the filling of many bottles of liquid preparation, can improve filling efficiency greatly.

According to the specific embodiment of the invention, the closed constant-pressure control tank for filling further comprises a sterilizing head 25 and a cleaning pipeline 26, wherein each filling head 23 is correspondingly provided with one sterilizing head 25, one end of each sterilizing head 25 is provided with a clamping sleeve used for being clamped with the filling head 23, the other end of each sterilizing head 25 is an outlet end communicated with the cleaning pipeline 26, and the cleaning pipeline 26 is provided with a seventh switch valve 7; the top of the liquid storage tank 16 is communicated with a steam, water and liquid medicine inlet pipeline 20 through a liquid storage tank cleaning ball 27 and a third switch valve 3.

In the embodiment, the online cleaning and sterilization can be realized by adopting the structure. During cleaning and sterilization, the operator manually inserts and clamps the ferrule of each sterilization head 25 onto the filling head 23. The filling head 23 is communicated with the cleaning pipeline 26, pure steam or purified water is introduced into the steam, water and liquid medicine inlet pipeline 20, and the pure steam or the purified water sequentially passes through the liquid storage tank 16, the filling head 23 and the sterilization head 25 and then is introduced into the cleaning pipeline 26, so that online sterilization and cleaning can be realized. When filling is required, the sterilization head 25 needs to be manually removed, and filling can be performed after entering a filling mode procedure.

According to the embodiment of the present invention, the cleaning and sterilizing unit further comprises a sixth switch valve 6 and a direct connection pipe 28 connecting the liquid storage tank 16 and the cleaning pipeline 26, the direct connection pipe 28 is provided with a fifth switch valve 5, and the outlet end of each sterilizing head 25 is communicated with the cleaning pipeline 26 through the sixth switch valve 6.

In this embodiment, the reservoir 16 can be cleaned and sterilized separately by connecting the straight connecting tube 28 directly to the cleaning tube 26.

According to the specific embodiment of the invention, the closed constant-pressure control tank for filling further comprises a foam recovery unit, the foam recovery unit comprises a foam recovery tank 29, a foam absorption main pipe 30 and a tenth switch valve 10, the upper part of each filling head 23 is communicated with the foam recovery tank 29 through the foam absorption main pipe 30 and the tenth switch valve 10, the foam recovery unit further comprises a vacuumizing assembly for vacuumizing the foam recovery tank 29 and a fifteenth switch valve 15 arranged at the bottom of the foam recovery tank 29, and a vacuum pressure gauge 31 is further arranged on the foam recovery tank 29.

In the present embodiment, by providing the foam recovery unit, when filling a liquid preparation product such as syrup and mixture which is likely to generate foam during filling, the foam recovery tank 29 is evacuated by the evacuation unit, and the foam in the filling head 23 enters the foam recovery tank 29 through the foam absorption main pipe 30, thereby eliminating foam during filling and ensuring the quality and efficiency of liquid medicine filling. The fifteenth switching valve 15 is opened to discharge the liquid in the foam recovery tank 29. A vacuum pressure gauge 31 is used to indicate the pressure within the foam recovery tank 29.

According to the embodiment of the invention, an air filter 32 is arranged between the electric proportional valve 19 and the second switch valve 2, and a first switch valve 1 is arranged between the air filter 32 and the electric proportional valve 19.

In this embodiment, the air filter 32 is added to filter the air entering the liquid storage tank 16, so as to improve the cleanliness of the air and prevent the air from polluting the liquid in the tank as much as possible.

According to the embodiment of the present invention, the air filter 32 is further communicated with the steam sterilization drain pipe 42 through the twelfth switch valve 12, the eighth switch valve 8 and the drain valve 33 in sequence.

In the present embodiment, when steam sterilization is performed on a part of the structure of the present invention, steam can be discharged through the steam sterilization drain pipe 42, thereby improving the sterilization effect.

According to the embodiment of the invention, the bottom of the foam recovery tank 29 is communicated with the steam sterilization drain pipeline 42 through the recovery tank drain pipe 34, and the recovery tank drain pipe 34 is provided with a ninth switch valve 9; the recovery tank drain pipe 34 is also in communication with the purge conduit 26; the top of the foam recovery tank 29 is communicated with the steam, water and liquid medicine inlet pipeline 20 through a recovery tank cleaning ball 35 and a fourth switch valve 4.

In this embodiment, with this configuration, when the foam recovery tank 29 is cleaned and sterilized, the cleaning water and the steam condensate can be discharged in time, which is advantageous for further improving the cleaning and sterilizing effects.

More specifically, the fifteenth switching valve 15 is a manual drain valve.

According to the embodiment of the invention, the vacuumizing assembly comprises a water circulation vacuumizing system 36 connected with the foam recovery tank 29, an eleventh switch valve 11 is arranged between the foam recovery tank 29 and the water circulation vacuumizing system 36, a vacuum regulating valve 37 is arranged between the eleventh switch valve 11 and the water circulation vacuumizing system 36, and the water circulation vacuumizing system 36 comprises a water pump cooling water discharge pipeline 38.

In this embodiment, the eleventh switch valve 11 controls the on-off between the foam recovery tank 29 and the water circulation vacuum pumping system 36, and the vacuum regulating valve 37 is used for regulating the suction force of the vacuum pumping system.

According to the specific embodiment of the invention, the first switch valve 1, the second switch valve 2, the third switch valve 3, the fourth switch valve 4, the fifth switch valve 5, the sixth switch valve 6, the seventh switch valve 7, the eighth switch valve 8, the ninth switch valve 9, the tenth switch valve 10, the eleventh switch valve 11 and the twelfth switch valve 12 are all pneumatic diaphragm valves, a thirteenth switch valve 13 is arranged on the steam, water and liquid medicine inlet pipeline 20, and the thirteenth switch valve 13 is a manual diaphragm valve; the outlet of the cleaning pipeline 26 and the outlet of the steam sterilization drain pipeline 42 are both provided with ball valves 39, and the steam, water and liquid medicine inlet pipeline 20, the filling main pipe 22, the foam absorption main pipe 30 and the steam sterilization drain pipeline 42 are both provided with temperature sensors 40; the reservoir tank 16 is also provided with a pressure sensor 41.

By adopting the closed constant-pressure control tank for filling, after liquid (water, steam), electricity and gas media are communicated, the precise control is realized through the preset parameters of liquid level, pressure, temperature and the like and the combined action of electricity and gas elements, the metering filling, cleaning and sterilizing processes can be carried out only by setting the parameters and simply operating on an operation screen, and the control and the regulation can be conveniently carried out. And controlling the liquid inlet quantity of the pneumatic diaphragm valve (the fourteenth switch valve 14) by PID according to the liquid level change signal output by the HT liquid level sensor (the tank top liquid level sensor 18) at the top of the constant-pressure liquid storage tank 16.

The PID control pneumatic diaphragm valve (the fourteenth switch valve 14) and the electric proportional valve 19 are synchronously controlled through signals of the tank bottom PT pressure sensor 17 and the tank top PT pressure sensor 41, so that simultaneous supplement or pressure relief of liquid medicine and clean air pressure is realized, constant-pressure filling control is realized, the liquid medicine in the liquid storage tank 16 can be completely filled, no residual tail liquid exists, and waste of the liquid medicine is reduced.

More specifically, in the present invention, the liquid storage tank 16, the connecting members and the connecting pipes are all connected in a sealed quick-connect manner, so that the disassembly and the replacement are convenient and quick, the liquid circulation pipeline runs smoothly without cleaning dead angles, and the effects of online cleaning and online disinfection and sterilization of the tank body and the filling pipeline are improved. And the structure of sealed quick card connection is adopted, no mechanical friction motion exists at the joint, no friction particle pollution is generated, and the aseptic protection before the liquid medicine filling is ensured.

The filling and cleaning process of the present invention is further described below.

1. State of the lines during filling

(1) The liquid medicine is metered and filled through a thirteenth switch valve 13, a fourteenth switch valve 14 and filling switch valves 24 (10 in total); the fourteenth switch valve 14 (outputs liquid level change signals according to the tank top liquid level sensor 18) controls the liquid inlet amount, and 10 filling switch valves 24 can realize bottle-free and non-filling of the corresponding filling heads 23.

(2) The supplement of the clean compressed air realizes the constant pressure filling control through an electric proportional valve 19 (the air supplement or pressure release of the cavity at the upper part of the liquid level in the tank is controlled according to the pressure change signal output by a PT pressure sensor 41 at the top of the constant pressure liquid medicine tank), a first switch valve 1 and a second switch valve 2.

(3) The foam generated during the liquid medicine filling process is pumped into the foam recovery tank 29 by a vacuum system through the tenth switch valve 10 and the eleventh switch valve 11.

Filling constant pressure control instruction: signals of a tank bottom PT pressure sensor 17 and a tank top PT pressure sensor 41 synchronously control the fourteenth switch valve 14 and the electric proportional valve 19 to realize simultaneous supplement or pressure relief of the liquid medicine and the clean air pressure.

2. Pipeline state during sterilization: the first, seventh, eleventh, and fifteenth switching valves 1, 7, 11, and 15 are closed, and the remaining valves are opened.

3. State of pipe line at the time of cleaning

(1) Cleaning the liquid storage tank 16: the thirteenth switching valve 13, the fifth switching valve 5 and the seventh switching valve 7 are opened, and the ball valve 39 at the end of the cleaning pipe 26 is opened.

(2) Cleaning a filling pipeline: and the thirteenth switch valve 13, the third switch valve 3, the 10 filling switch valves 24, the sixth switch valve 6 and the seventh switch valve 7 are opened, and the ball valve 39 at the tail end of the cleaning pipeline 26 is opened.

(3) Cleaning a foam recovery pipeline: the thirteenth switching valve 13, the third switching valve 3, the tenth switching valve 10, the ninth switching valve 9, and the seventh switching valve 7 are opened, and the ball valve 39 at the end of the purge pipe 26 is opened.

(4) Cleaning a foam tank: the thirteenth switching valve 13, the fourth switching valve 4, the ninth switching valve 9 and the seventh switching valve 7 are opened, and the ball valve 39 at the end of the cleaning pipe 26 is opened.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the connection may be mechanical, electrical, direct, indirect through an intermediate medium, or internal communication between two elements, or "transmission connection", i.e., power connection through various suitable manners such as belt transmission, gear transmission, or sprocket transmission. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims (10)

1. A closed constant-pressure control tank for filling, which is used for metering and filling liquid preparation, and is characterized by comprising: the liquid storage tank comprises a liquid storage tank (16), a tank bottom pressure sensor (17), a tank top liquid level sensor (18), a fourteenth switch valve (14), a second switch valve (2) and an electric proportional valve (19), wherein the tank bottom pressure sensor (17) is arranged below the inner part of the liquid storage tank (16) and is used for detecting the internal pressure information of liquid in the liquid storage tank (16); the tank top liquid level sensor (18) is arranged above the inner part of the liquid storage tank (16) and is used for detecting liquid level information in the liquid storage tank (16); the fourteenth switching valve (14) is arranged on a steam, water and liquid medicine inlet pipeline (20) connected with the liquid storage tank (16), and the fourteenth switching valve (14) is used for controlling the liquid medicine inlet amount according to the liquid level information; the second switch valve (2) is arranged on a clean compressed air inlet pipeline (21) connected with the liquid storage tank (16); electric proportional valve (19) also locate on clean compressed air gets into pipeline (21), just electric proportional valve (19) are used for the basis liquid internal pressure information, control second ooff valve (2) switch, in order to right liquid level upper portion cavity carries out tonifying qi or pressure release in liquid storage pot (16) to realize the constant pressure filling.

2. The hermetic constant-pressure control tank for filling as claimed in claim 1, wherein a filling header pipe (22) is provided at a lower portion of the liquid storage tank (16), the filling header pipe (22) is connected to a plurality of filling heads (23), and a filling switching valve (24) is provided between each filling head (23) and the liquid storage tank (16).

3. A closed constant pressure control tank for filling as claimed in claim 2, further comprising a sterilizing head (25) and a cleaning pipeline (26), wherein one sterilizing head (25) is disposed corresponding to each filling head (23), one end of the sterilizing head (25) is provided with a clamping sleeve for clamping with the filling head (23), the other end of the sterilizing head (25) is an outlet end communicated with the cleaning pipeline (26), and a seventh switch valve (7) is disposed on the cleaning pipeline (26); the top of the liquid storage tank (16) is communicated with the steam, water and liquid medicine inlet pipeline (20) through a cleaning ball (27) of the liquid storage tank and a third switch valve (3).

4. The hermetic constant-pressure control tank for filling according to claim 3, wherein the cleaning and sterilizing unit further comprises a sixth on-off valve (6) and a direct connection pipe (28) connecting the liquid storage tank (16) and the cleaning pipe (26), the direct connection pipe (28) is provided with a fifth on-off valve (5), and an outlet end of each sterilizing head (25) is communicated with the cleaning pipe (26) through the sixth on-off valve (6).

5. The closed constant pressure control tank for filling as claimed in claim 4, further comprising a foam recovery unit, wherein the foam recovery unit comprises a foam recovery tank (29), a foam absorption main pipe (30) and a tenth switch valve (10), the upper part of each filling head (23) is communicated with the foam recovery tank (29) through the foam absorption main pipe (30) and the tenth switch valve (10), the foam recovery unit further comprises a vacuum pumping assembly for pumping vacuum to the foam recovery tank (29) and a fifteenth switch valve (15) arranged at the bottom of the foam recovery tank (29), and a vacuum pressure gauge (31) is further arranged on the foam recovery tank (29).

6. The hermetically sealed constant pressure control can for filling according to claim 5, characterized in that an air filter (32) is provided between the electric proportional valve (19) and the second on-off valve (2), and a first on-off valve (1) is provided between the air filter (32) and the electric proportional valve (19).

7. The closed constant pressure control tank for filling as claimed in claim 6, further comprising a steam sterilization drain line (42), wherein the air filter (32) is further communicated with the steam sterilization drain line (42) via a twelfth switch valve (12), an eighth switch valve (8) and a drain valve (33) in sequence.

8. The hermetic constant pressure control tank for filling as claimed in claim 7, wherein the bottom of the foam recovery tank (29) and the steam sterilization drain pipe (42) are communicated through a recovery tank drain pipe (34), and a ninth on-off valve (9) is provided on the recovery tank drain pipe (34); the recovery tank drain pipe (34) is also communicated with the cleaning pipeline (26); the top of the foam recovery tank (29) is communicated with the steam, water and liquid medicine inlet pipeline (20) through a recovery tank cleaning ball (35) and a fourth switch valve (4).

9. The hermetic constant pressure control tank for filling as claimed in claim 8, wherein the evacuation assembly comprises a water circulation evacuation system (36) connected to the foam recovery tank (29), an eleventh switch valve (11) is provided between the foam recovery tank (29) and the water circulation evacuation system (36), a vacuum regulating valve (37) is provided between the eleventh switch valve (11) and the water circulation evacuation system (36), and the water circulation evacuation system (36) comprises a water pump cooling water discharge pipe (38).

10. The hermetic constant-pressure control tank for filling of claim 9, wherein the first switch valve (1), the second switch valve (2), the third switch valve (3), the fourth switch valve (4), the fifth switch valve (5), the sixth switch valve (6), the seventh switch valve (7), the eighth switch valve (8), the ninth switch valve (9), the tenth switch valve (10), the eleventh switch valve (11) and the twelfth switch valve (12) are all pneumatic diaphragm valves, a thirteenth switch valve (13) is arranged on the steam, water and liquid medicine inlet pipeline (20), and the thirteenth switch valve (13) is a manual diaphragm valve; the fourteenth switch valve (14) is a PID control pneumatic diaphragm valve; the outlet of the cleaning pipeline (26) and the outlet of the steam sterilization drain pipeline (42) are respectively provided with a ball valve (39), and the steam, water and liquid medicine inlet pipeline (20), the filling main pipe (22), the foam absorption main pipe (30) and the steam sterilization drain pipeline (42) are respectively provided with a temperature sensor (40); the liquid storage tank (16) is also provided with a pressure sensor (41).

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