CN215295571U - Freeze dryer and laminar flow steam mixing system thereof - Google Patents

Abstract

The utility model discloses a freeze dryer and laminar flow mix vapour system thereof, the laminar flow mix vapour system of freeze dryer is connected with the steam escape pipe way including storing up the vapour jar, the exit end of storing up the vapour jar, and the steam escape pipe way communicates to the freeze dryer box, is provided with in the steam escape pipe way and mixes the vapour valve, mixes the vapour valve and is interrupted the switching. The laminar flow steam-mixing system of the freeze dryer forms laminar flow pulse in the freeze drying box body in a mode of mixing water vapor into the freeze dryer discontinuously, ensures that the vacuum degree in the freeze drying box body fluctuates in a proper range, avoids the condition of over-low or over-high, and simultaneously continuously transfers heat emitted when the vapor desublimates to a freeze-dried product, so that the temperature of the product can be uniformly and properly increased, and the sublimation drying process of the product is accelerated; moreover, the high-temperature steam can ensure the sterile state of the whole steam mixing system, so that freeze-dried products are effectively protected, and the risk of pollution is avoided.

Description

Freeze dryer and laminar flow steam mixing system thereof

Technical Field

The utility model relates to a drying equipment technical field, in particular to freeze dryer's laminar flow mixes vapour system. It also relates to a freeze dryer.

Background

The product in the freeze dryer is dried by sublimation, the water sublimation process in the product needs to absorb heat which mainly comes from the heat transfer of the heatable plate layer and the convection heat transfer of the ambient air.

When the mode of convection heat transfer is adopted, the heat is provided by increasing the convection heat transfer capacity of the air in the freeze drying box, so that the freeze drying speed is accelerated. At present, in order to improve the capability of the freeze dryer for convection heat transfer of products, the common method is only to control the vacuum degree in the freeze drying box to be not lower than 0.1mbar of absolute pressure, and there are two main control modes: 1. controlling an evacuation valve, namely vacuumizing the freeze-drying box, and closing the evacuation valve when the pressure in the freeze-drying box is reduced; the water vapor sublimed from the product can increase the pressure in the freeze-drying box, and then the vacuum valve is opened again to continuously vacuumize the freeze-drying box. 2. Controlling the air mixing valve, and mixing air and other media into the freeze-drying box while vacuumizing the freeze-drying box so as to keep the vacuum degree in the freeze-drying box basically unchanged. The above control methods have the following defects: 1. because the water content in the product is less and less, the vacuum degree in the freeze-drying box can be continuously reduced under the action of the temperature of the cold trap, and the capability of convection heat transfer is weaker and weaker. 2. Because the temperature of the mixed air is not high, the heat quantity is limited, the mixing speed is slow, the mixing quantity is small, and the convective heat transfer capability is weak.

Therefore, how to provide a laminar flow steam mixing system of a freeze dryer which solves the technical problems is a technical problem which needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a laminar flow of freeze dryer mixes vapour system adopts the mode of mixing steam to freeze dryer internal discontinuity, forms the laminar flow pulse in the freeze-drying box, guarantees that the vacuum in the freeze-drying box fluctuates in appropriate scope, can not appear crossing low or too high condition, and the heat that emits when steam desublimation is constantly transmitted to the freeze-dried product simultaneously, can be even suitably improve the product temperature for its sublimation drying process; moreover, the high-temperature steam can ensure the sterile state of the whole steam mixing system, so that freeze-dried products are effectively protected, and the risk of pollution is avoided. Another object of the utility model is to provide a freeze dryer.

In order to realize the above-mentioned purpose, the utility model provides a vapour system is mixed to laminar flow of freeze dryer, include the steam storage tank that is used for storing steam, the exit end of steam storage tank is connected with the steam discharge pipeline, the steam discharge pipeline communicates to the freeze dryer box, be provided with in the steam discharge pipeline and mix the vapour valve, mix the vapour valve and be used for opening the back with first preset time and close and use this to work as cycle with second preset time again to the realization produces the steam laminar flow that lasts and provides the heat for the freeze-dried product in the freeze dryer box.

Preferably, the inlet end of the steam storage tank is connected with a steam inlet pipeline, the steam inlet pipeline is communicated to a steam device, and a steam inlet valve is arranged at one end, close to the steam storage tank, of the steam inlet pipeline.

Preferably, a steam pressure reducing valve is arranged at one end of the steam inlet pipeline, which is close to the steam equipment.

Preferably, a pipeline of the steam inlet pipeline between the steam pressure reducing valve and the steam inlet valve is a steam quantity adjusting pipeline, and a steam quantity adjusting valve is arranged in the steam quantity adjusting pipeline.

Preferably, the steam quantity regulating pipeline comprises at least two branches connected in parallel, and each branch is provided with one steam quantity regulating valve.

Preferably, the steam inlet pipeline is also communicated to a drainage device, and a drain valve is arranged at one end close to the drainage device.

Preferably, the steam storage tank further comprises a temperature sensor arranged on the steam storage tank.

Preferably, the temperature sensor comprises a first temperature probe to monitor a tank internal temperature of the steam storage tank and a second temperature probe to monitor a tank wall temperature of the steam storage tank.

Preferably, the steam exhaust device further comprises a pressure transmitter arranged on the steam exhaust pipeline; and a heat-preservation heating film which completely wraps the steam storage tank is arranged on the outer side of the steam storage tank.

The utility model also provides a freeze dryer, include as above-mentioned laminar flow mix vapour system.

Compared with the prior art, the utility model provides a freeze dryer's laminar flow mixes vapour system includes the steam storage tank, steam storage tank storage steam, the exit end of steam storage tank is connected with the steam discharge pipeline, the steam discharge pipeline communicates to the freeze dryer box, be provided with in the steam discharge pipeline and mix the vapour valve, mix the vapour valve and open the back with first preset time and close and use this to carry out work as cycle with the second preset time again, the realization produces the steam laminar flow that lasts and provides the heat for the freeze-dried product in the freeze dryer box. The laminar flow steam-mixing system of the freeze dryer adopts a mode of discontinuously mixing water vapor into the freeze dryer, laminar flow pulse is formed in the freeze drying box body, the fluctuation of the vacuum degree in the freeze drying box body within a proper range is ensured, the condition of over-low or over-high is avoided, meanwhile, heat emitted during desublimation of the vapor is continuously transferred to a freeze-dried product, the temperature of the product can be uniformly and properly increased, and the sublimation drying process of the product is accelerated; moreover, the high-temperature steam can ensure the sterile state of the whole steam mixing system, so that freeze-dried products are effectively protected, and the risk of pollution is avoided.

Drawings

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

Fig. 1 is a schematic view of a laminar flow steam mixing system of a freeze dryer provided by an embodiment of the present invention.

Wherein:

1-a steam pressure reducing valve, 2-a drain valve, 3-a first steam quantity regulating valve, 4-a second steam quantity regulating valve, 5-a steam inlet valve, 6-a steam storage tank, 7-a first temperature probe, 8-a pressure transmitter, 9-a heat preservation heating film, 10-a second temperature probe, 11-a steam mixing valve, 12-a freeze dryer box body, 13-a freeze dryer cold trap and 14-a freeze dryer plate layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1, fig. 1 is a schematic view of a laminar flow steam mixing system of a freeze dryer according to an embodiment of the present invention.

In a specific implementation manner, the utility model provides a freeze dryer's laminar flow mixes vapour system includes vapor storage tank 6, vapor storage tank 6 storage vapor, vapor storage tank 6's exit end is connected with the steam discharge pipeline, the steam discharge pipeline communicates to freeze dryer box 12, be provided with in the steam discharge pipeline and mix vapour valve 11, mix vapour valve 11 and open the back with first preset time and close and use this to work as cycle with second preset time again, provide the heat for the freeze-drying product in freeze dryer box 12 with the realization production steam laminar flow that lasts.

It should be noted that the utility model discloses a core improvement point lies in improving the inside temperature of freeze dryer product with the mode of doping steam, improves the homogeneity of the inside temperature of product simultaneously for its drying process shortens freeze-drying time, saves the consumption of the freeze dryer energy. In addition, other structures and working principles of the freeze dryer are not changed, for example, the conventional freeze dryer should have a freeze dryer box 12, a freeze dryer cold trap 13, a freeze dryer plate layer 14, and the like, and the internal structures include a plate layer, a vacuum pump, a compressor, and the like, so that the functions of refrigeration, vacuum, and the like of product freeze drying can be realized, and reference can be made to the prior art, which is not described herein again.

Specifically, the laminar flow steam-mixing system of the freeze dryer adopts a mode of discontinuously mixing water vapor into the freeze dryer, laminar flow pulses are formed in the freeze drying box body 12, the fluctuation of the vacuum degree in the freeze drying box body 12 in a proper range is ensured, the condition of over-low or over-high is avoided, meanwhile, heat emitted during steam desublimation is continuously transferred to freeze-dried products, the temperature of the products can be uniformly and properly increased, and the sublimation drying process of the products is accelerated; moreover, in order to avoid the pollution of the freeze-dried product, the air to be mixed is required to be sterile gas, so that the matched sterile air equipment and facilities are required, and the high-temperature steam of the embodiment can ensure the sterile state of the whole steam mixing system, thereby effectively protecting the freeze-dried product and avoiding the risk of pollution.

It should be noted that: laminar flow, which is a fluid flow state, is referred to as a laminar flow dew point/dew point temperature Td, and the temperature at which air is cooled to saturation is called the dew point temperature, or dew point for short, expressed in degrees Celsius or degrees Fahrenheit, under the condition that the water vapor content in the air is constant and the air pressure is kept constant. In effect, the temperature at which the water vapor and water reach equilibrium. The difference between the actual temperature (t) and the dew point temperature (Td) represents the degree of saturation of the air distance. When t > Td, the air is not saturated, when t is Td, the air is saturated, and when t < Td, the air is supersaturated; and (3) blending steam, namely intermittently supplementing water vapor to control the vacuum degree in the freeze dryer to keep basically constant.

The steam in the steam storage tank 6 can be provided by adopting a steam source such as a steam device, at the moment, the inlet end of the steam storage tank 6 is connected with a steam inlet pipeline, and the steam inlet pipeline is communicated to the steam device and is provided with a steam inlet valve 5 close to one end of the steam storage tank 6.

In this embodiment, the steam storage tank 6 is a cylindrical structure with smooth inside and no dead space, and the volume of the steam storage tank matches with the volume of the freeze-drying box body 12, about 1/4000. The steam mixing valve 11 is a pneumatic diaphragm valve and is connected with the steam storage tank 6 and the freeze dryer box body 12, and the amount of steam entering the freeze dryer is controlled by opening and closing the valve. The steam inlet valve 5 is a pneumatic diaphragm valve, and the amount of steam entering the steam storage tank 6 is controlled by opening and closing the valve.

For better technical effect, a steam pressure reducing valve 1 is arranged at one end of the steam inlet pipeline close to the steam equipment.

In this embodiment, the function of the steam relief valve 1 is to limit the external pure steam source pressure to below 1.6bar, preventing excessive steam pressure from damaging the equipment, while stabilizing the steam admission speed.

Furthermore, a pipeline of the steam inlet pipeline, which is positioned between the steam pressure reducing valve 1 and the steam inlet valve 5, is a steam quantity adjusting pipeline, and a steam quantity adjusting valve is arranged in the steam quantity adjusting pipeline.

The steam quantity adjusting pipeline comprises at least two parallel branches, and each branch is provided with a steam quantity adjusting valve.

Illustratively, the number of the steam volume adjusting pipelines is two, and the steam volume adjusting valve comprises a first steam volume adjusting valve 3 and a second steam volume adjusting valve 4 which are respectively arranged on the two steam volume adjusting pipelines.

In this embodiment, the steam inlet valve 5 is connected with two steam quantity regulating valves and the steam storage tank 6, and the first steam quantity regulating valve 3 and the second steam quantity regulating valve 4 jointly regulate the caliber of a steam inlet pipeline to limit the speed of steam entering the steam storage tank 6.

Besides, the steam inlet pipeline is communicated to the drainage device, and a drain valve 2 is arranged at one end close to the drainage device.

In this embodiment, the trap 2 is an inverted bucket trap, which can drain all the steam and condensed water in the pipeline, preventing the condensed water from entering the steam storage tank 6.

In addition, the steam storage tank also comprises a temperature sensor arranged in the steam storage tank 6.

Illustratively, the temperature sensor comprises a first temperature probe 7 to monitor the tank interior temperature of the steam storage tank 6 and a second temperature probe 10 to monitor the tank wall temperature of the steam storage tank 6.

In addition, a pressure transmitter 8 is provided in the steam discharge line.

In this embodiment, the first temperature probe 7 and the pressure transmitter 8 are both chuck interfaces. The temperature probe is PT100 thermal resistance type, and the precision is 0.1 ℃. The accuracy of the pressure transmitter 8 is 0.001 bar.

In addition, the outer side of the steam storage tank 6 is provided with a heat preservation heating film 9 which completely wraps the steam storage tank 6.

In this embodiment, the power of the heat-insulating heating film 9 is 500W, the heat-insulating heating film 9 can completely wrap the steam storage tank 6, and the outer wall of the steam storage tank 6 is tightly attached to the heat-insulating heating film 9 without a gap. The second temperature probe 10 is fixed on the outer surface of the heat preservation heating film 9 and covered by the rubber plastic heat preservation material.

In one particular operation:

before the freeze-drying process of the freeze dryer is started, the pipeline can be sterilized, the heating film 9 is firstly insulated to work, and the temperature of the second temperature probe 10 is kept at 130 ℃ so as to reduce the condensed water generated when steam enters the steam storage tank 6. The steam valve 5 is then operated to maintain the first temperature probe 7 at 121 c for 30 minutes, thereby sterilizing the entire pipeline and the steam storage tank 6.

In the whole freeze-drying process, high-pressure pure steam passes through the steam pressure reducing valve 1, and pressure is reduced to below 1.6bar, prevents that too high steam pressure from damaging equipment, has also injectd the pressure that steam got into steam storage tank 6 simultaneously, cooperates first vapour volume governing valve 3 and the regulation to the pipe diameter of second vapour volume governing valve 4 to control steam and get into the speed of steam storage tank 6, avoid appearing the condition that the vapour volume is not enough or internal pressure acutely fluctuates in steam storage tank 6.

During the whole freeze-drying process, the pipeline and the steam storage tank 6 can continuously generate condensed water, and the process that water enters the vacuum freeze dryer box body 12 is a gasification heat absorption process, so that the condensed water is drained as much as possible, and the inverted bucket type drain valve 2 can play a role in effectively draining the condensed water. In addition, the heat preservation heating film 9 works, the second temperature probe 10 is kept at 100 ℃, and the generation of condensed water in the steam storage tank 6 can be effectively reduced.

In the sublimation drying stage of the freeze-drying process, the interior of the freeze dryer box body 12 is in a vacuum state, generally about 0.2mbar, the freeze dryer cold trap 13 is used for refrigerating, generally about-60 ℃, the product on the freeze dryer plate layer 14 starts the sublimation drying process, and ice in the product needs to absorb heat to sublimate into water vapor and migrate into the freeze dryer cold trap 13. At this stage, the steam inlet valve 5 works, and the steam pressure in the steam storage tank 6 is controlled to be close to a preset value according to the pressure in the steam storage tank 6 detected by the pressure transmitter 8, wherein the preset value defaults to 0.5 bar. This preset value determines the amount of steam entering the laminar flow pulse of the freeze dryer, a steam amount of 0.5bar entering the freeze dryer tank 12 will generate a pressure rise of about 0.12 mbar. The preset value is adjusted, namely the amplitude of the single steam laminar flow pulse is adjusted.

Because the sublimation drying of the freeze-dried product needs continuous heat absorption, the steam mixing valve 11 works intermittently to generate continuous steam laminar flow to provide heat for the freeze-dried product, the default steam mixing valve 11 is opened for 2 seconds and closed for 30 seconds, and certainly, the opening time and the closing time can be adjusted according to the heat requirement.

The utility model also provides a freeze dryer, vacuum freeze dryer promptly, mix vapour system including above-mentioned laminar flow, should have above-mentioned laminar flow and mix whole beneficial effect of vapour system. This freeze dryer is in the dry process of inside product sublimation, according to the thermal needs of sublimation, the right amount of vapor is doped to the pulsed, and the heating power laminar flow that vapor was emitted in the desublimation in-process in freeze dryer box 12 can improve the inside temperature of product, improves the homogeneity of the inside temperature of product simultaneously for its drying process shortens freeze-drying time, saves the consumption of the freeze dryer energy.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The freeze dryer and the laminar flow steam mixing system thereof provided by the utility model are introduced in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. The laminar flow steam mixing system of the freeze dryer is characterized by comprising a steam storage tank (6) used for storing water vapor, wherein the outlet end of the steam storage tank (6) is connected with a steam discharge pipeline, the steam discharge pipeline is communicated to a freeze dryer box body (12), a steam mixing valve (11) is arranged in the steam discharge pipeline, and the steam mixing valve (11) is opened within a first preset time, then closed within a second preset time and works within a cycle period, so that continuous steam laminar flow is generated to provide heat for freeze-dried products in the freeze dryer box body (12).

2. The laminar flow steam mixing system according to claim 1, characterized in that a steam inlet pipeline is connected to an inlet end of the steam storage tank (6), the steam inlet pipeline is communicated to a steam device, and a steam inlet valve (5) is arranged near one end of the steam storage tank (6).

3. The laminar flow steam mixing system according to claim 2, characterized in that a steam pressure reducing valve (1) is arranged at one end of the steam inlet pipeline close to the steam equipment.

4. The laminar flow steam mixing system according to claim 3, wherein the steam inlet pipeline is positioned between the steam pressure reducing valve (1) and the steam inlet valve (5) and is a steam quantity adjusting pipeline, and a steam quantity adjusting valve is arranged in the steam quantity adjusting pipeline.

5. The laminar flow steam mixing system according to claim 4, wherein the steam volume adjusting pipeline comprises at least two parallel branches, and each branch is provided with one steam volume adjusting valve.

6. The laminar flow steam mixing system according to any one of claims 2 to 5, characterized in that the steam inlet pipeline is also communicated to a drainage device and a drain valve (2) is arranged near one end of the drainage device.

7. The laminar flow steam mixing system according to any one of claims 1 to 5, characterized by further comprising a temperature sensor provided to the steam storage tank (6).

8. The laminar flow steam blending system according to claim 7, characterized in that the temperature sensor comprises a first temperature probe (7) to monitor the tank interior temperature of the steam storage tank (6) and a second temperature probe (10) to monitor the tank wall temperature of the steam storage tank (6).

9. The laminar flow steam blending system according to any one of claims 1 to 5, further comprising a pressure transmitter (8) provided to the steam discharge line; and a heat-preservation heating film (9) which completely wraps the steam storage tank (6) is arranged on the outer side of the steam storage tank (6).

10. A freeze dryer comprising a laminar flow aeration system according to any one of claims 1 to 9.

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