CN216868861U - Refrigerating system of freeze dryer - Google Patents

Abstract

The utility model discloses a refrigeration system of a freeze dryer, which comprises a cold trap and a refrigeration unit for refrigerating the cold trap, wherein the refrigeration unit is communicated with the cold trap through a first connecting pipe to form a main circulation loop, the refrigeration unit comprises a first compressor, a heat exchanger and a silicon oil plate exchanger, the main circulation loop is formed by connecting the first compressor, the heat exchanger, a first expansion valve, the silicon oil plate exchanger, a second expansion valve and the cold trap in series in sequence, and a refrigerant can circularly flow in the main circulation loop through the first connecting pipe along the direction from the first compressor to the heat exchanger. According to the utility model, the cold trap is arranged at the rear part of the silicon oil plate exchanger, and the incomplete throttling first expansion valve and the complete throttling second expansion valve are respectively arranged at the two sides of the silicon oil plate exchanger, so that the flow of the refrigerant in the first connecting pipe is controlled, the refrigerating capacity is matched with the refrigerating depth, larger refrigerating equipment components are not required to be selected, the whole equipment has small volume and small occupied space, the power consumption is reduced, the cost is effectively saved, and the practicability is strong.

Description

Refrigerating system of freeze dryer

Technical Field

The utility model relates to the field of freeze dryers, in particular to a freeze dryer refrigerating system.

Background

The freeze dryer is a device for freeze drying medicines and foods in the pharmaceutical industry and the food industry, namely, the freeze drying is to pre-freeze objects needing freeze drying at low temperature, then reducing the water content of the product to a level that the biological reaction and the chemical reaction can not be maintained for a long time by a vacuum sublimation and desorption method, in the vacuum sublimation drying stage, the frozen free water in the material is under the condition of being lower than the saturated vapor pressure corresponding to the common junction point, the water can be completely escaped in a sublimation mode and enters a condensation surface to be frozen, more than 85 percent of water can be removed after the sublimation is finished, in the desorption drying stage, after sublimation drying is completed, the remaining small amount of adsorbed water (which is adsorbed on cell walls and polar molecules of the material and is not frozen, and generally accounts for about 10% of the total water content) is removed by evaporation. The freeze dryer is dried at low temperature, does not deform protein, but can lose biological activity of microorganisms and the like, and is particularly suitable for bioactive products, biochemical products, genetic engineering products, blood products and the like with poor thermal stability.

The freeze dryer mainly comprises a refrigeration system, a vacuum system, a circulating system, a hydropneumatic system, a CIP/SIP system, a control system and the like, wherein the refrigeration system is the core of the freeze dryer and is a heart part of the freeze dryer, so the quality of the refrigeration system directly influences the running reliability of the freeze dryer system. The freeze dryer is usually provided with a cold trap, and the cold trap absorbs water vapor by physical adsorption through refrigeration so as to achieve the refrigeration effect. However, in the conventional technology disclosed in fig. 1, a refrigeration system used in a freeze dryer is often provided with a single expansion valve for throttling, a cold trap is arranged at the front end of a silicone oil plate, and a refrigerant flows from a low-temperature compressor, flows through a throttle valve for throttling, enters the cold trap, flows to the silicone oil plate for exchanging, and finally returns to the low-temperature compressor. Its shortcoming is that the refrigerating output is lower, is not enough to satisfy the refrigeration degree of depth, simultaneously in order to satisfy the refrigerating output that follow-up silicon oil plate traded, needs bigger high temperature compressor, condenser and bigger low temperature compressor and heat exchanger, and the cost is higher, and equipment selection occupies great space to can lead to daily power consumption's increase.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a refrigeration system of a freeze dryer, which controls the flow of a refrigerant in a first connecting pipe by arranging a cold trap at the rear part of a silicone oil plate exchanger and arranging an incomplete throttling first expansion valve and a complete throttling second expansion valve at two sides of the silicone oil plate exchanger respectively, so that the refrigerating capacity is matched with the refrigerating depth, a larger refrigeration equipment component is not required to be selected, the whole equipment has smaller volume and small occupied space, the power consumption is reduced, the cost is effectively saved, and the practicability is strong.

In order to solve the technical problem, the utility model is solved by the following technical scheme: the utility model provides a freeze dryer refrigeration system, includes the cold trap and is used for the refrigerated refrigeration unit of cold trap, refrigeration unit and cold trap form main circulation circuit through first connecting pipe intercommunication, refrigeration unit includes that first compressor, heat exchanger and silicon oil board trade, main circulation circuit comprises first compressor, heat exchanger, first expansion valve, silicon oil board trade, second expansion valve and cold trap series connection in proper order, and the refrigerant can be followed first compressor and is in to the heat exchanger direction through first connecting pipe circulation flow in the main circulation circuit.

Preferably, the first expansion valve is set to an incomplete throttle, and the second expansion valve is set to a complete throttle.

Preferably, the first connecting pipe comprises a first branch pipe and a second branch pipe, the first expansion valve, the silicone oil plate exchanger and the second expansion valve are communicated through the first branch pipe, and the second expansion valve, the first compressor, the heat exchanger and the first expansion valve are communicated through the second branch pipe.

Preferably, the input end of the heat exchanger is connected with the output end of the first compressor, and the output end of the heat exchanger is connected with the input end of the first expansion valve.

Preferably, the system further comprises a pre-cooling unit for pre-cooling the refrigeration unit, and the pre-cooling unit is connected with the main circulation loop through the heat exchanger.

Preferably, the pre-cooling unit includes a second compressor and a condenser, the second compressor and the condenser are sequentially communicated through a second connecting pipe to form a first branch loop, a third expansion valve connected to an output end of the condenser is further disposed on the first branch loop, the heat exchanger is connected between the second compressor and the third expansion valve through a second connecting pipe, and a refrigerant in the refrigeration unit and a refrigerant in the pre-cooling unit exchange heat in the heat exchanger.

Preferably, the system further comprises a second branch loop, and the second branch loop is connected with the main circulation loop through the silicone oil plate switch.

Preferably, the silicone oil plate is provided with a third connecting pipe for the silicone oil plate to exchange the flowing silicone oil, the second branch loop is provided with a water pump, a heater and a partition plate which are sequentially communicated through the third connecting pipe, and the silicone oil plate is connected between the water pump and the partition plate through the third connecting pipe. Preferably, the input end of the silicone oil plate exchanger is connected with the output end of the first expansion valve, and the output end of the silicone oil plate exchanger is connected with the input end of the second expansion valve.

Preferably, an input end of the cold trap is connected with an output end of the second expansion valve, and an output end of the cold trap is connected with an input end of the first compressor;

the heat exchanger is a plate heat exchanger.

The utility model achieves the following beneficial effects:

(1) through setting up two expansion valves, set up the cold trap in the position that the back was traded to the silicone oil board, and the double-expansion valve sets up respectively in the silicone oil board and trades both sides, realize that the refrigerant flows through the circulation of first connecting pipe in main circulation loop, it is higher to make the refrigerant refrigerating output, the unmatched problem of traditional freeze-drying mechanism refrigeration capacity and refrigeration degree of depth has been solved, need not to select great refrigeration plant subassembly, it is less to make the whole volume of equipment, reduce power consumption, effectively practice thrift the cost, and occupation space is less, the stronger effect of practicality has.

(2) The first expansion valve is set to be incomplete throttling, the flow rate of the refrigerant flowing in the first connecting pipe and exchanging towards the silicone oil plate is controlled, so that part of the refrigerant flows through the silicone oil plate to exchange and vaporize, and then exchanges heat with the silicone oil through the silicone oil plate, so that the refrigerant absorbs heat to refrigerate and is uniformly cooled, high heat exchange efficiency is realized, the power consumption is reduced, and the cost is saved; the second expansion valve is set to be completely throttled, the second expansion valve is used for controlling the opening and closing of the first connecting pipe at the input end of the cold trap, the circulation flow of the refrigerant in the first connecting pipe is adjusted, the liquid refrigerant flowing from the silicone oil plate to the second expansion valve is completely throttled, the refrigerating capacity of the refrigerant is improved, the refrigerating depth of the cold trap is met, deep cooling refrigeration is provided for the cold trap, the problem that the refrigerating capacity of a traditional freeze-drying machine is not matched with the refrigerating depth is solved, a large refrigerating equipment component is not required to be selected, the whole size of the equipment is small, the power consumption is reduced, the cost is effectively saved, and a small space is occupied.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:

fig. 1 is a schematic diagram of the overall structure of a refrigeration system of a freeze dryer disclosed in the prior art.

Fig. 2 is a schematic view of the overall structure of a refrigeration system of a freeze dryer according to the embodiment disclosed.

Fig. 3 is a schematic view of the overall structure of another refrigeration system of a freeze dryer according to the embodiment disclosed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model without any inventive step, are within the scope of protection of the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

As shown in fig. 2, as an embodiment of the present invention, a refrigeration system of a freeze dryer is disclosed, which includes a cold trap 1 and a refrigeration unit 2 for refrigerating the cold trap 1, the cold trap 1 is communicated with the refrigeration unit 2 through a first connection pipe 100 to form a main circulation loop 200, the refrigeration unit 2 includes a first compressor 21, a heat exchanger 22 and a silicone oil plate exchanger 23, the main circulation loop 200 is composed of a first compressor 21, a heat exchanger 22, a first expansion valve 4, a silicone oil plate exchanger 23, a second expansion valve 5 and the cold trap 1 in series, a refrigerant can circulate in the main circulation loop 200 through the first connection pipe 100 along the direction from the first compressor 21 to the heat exchanger 22, the first compressor 21 is a low-temperature compressor to provide power for the circulation of the refrigerant in the first connection pipe 100, the first expansion valve 4 is used for controlling the flow rate of the refrigerant flowing from the first compressor 21 to the heat exchanger 22 and flowing from the heat exchanger 22 to the silicone oil plate exchanger 23, the refrigerant flow in the first connecting pipe 100 is respectively matched with the heat exchange rates of the heat exchanger 22 and the silicone oil plate exchanger 23, so that high heat exchange efficiency is realized, the power consumption is reduced, and the cost is saved; the second expansion valve 5 is used for controlling the opening and closing of the first connecting pipe 100 at the input end of the cold trap 1, so as to adjust the circulation flow of the refrigerant in the first connecting pipe 100, in this embodiment, the heat exchanger 22 is a plate heat exchanger, the plate heat exchanger is thin in thickness and light in overall weight, and has the characteristics of good heat transfer effect and high heat exchange efficiency, and meanwhile, the freeze dryer is easy to install and occupies a small space, so that the whole volume of the freeze dryer equipment is small, the power consumption is reduced, and the freeze dryer equipment has a strong practicability effect; the refrigerant in the first connection pipe 100 flows from the low-temperature first compressor 21 to the heat exchanger 22 and then enters the first expansion valve 4, the first expansion valve 4 is used for controlling the flow rate of the refrigerant, in the embodiment, the first expansion valve 4 is set to be not fully throttled, silicone oil serving as a heat transfer medium is filled in the silicone oil plate exchanger 23, part of the refrigerant flows through the silicone oil plate exchanger 23 and is vaporized, and the vaporized refrigerant and the silicone oil exchange heat through the silicone oil plate exchanger 23, so that the refrigerant absorbs heat and is cooled, and the effect of uniform temperature drop is achieved; the vapor-liquid two-state refrigerant flows to the second expansion valve 5 from the silicone oil plate 23, the liquid refrigerant is completely throttled by the second expansion valve 5 to meet the refrigeration depth of the cold trap, and the refrigerant after providing cryogenic refrigeration for the cold trap flows back to the low-temperature first compressor 21; through setting up the cold trap in the position that the silicon oil board traded 23 rear, and the double expansion valve sets up respectively in the silicon oil board and trades both sides, realize that the refrigerant flows through the circulation of first connecting pipe 100 in main circulation circuit 200, make the refrigerant refrigerating output higher, the unmatched problem of traditional freeze-drying mechanism refrigeration capacity and refrigeration degree of depth has been solved, need not to select great refrigeration plant subassembly, it is less to make the whole volume of equipment, reduce power consumption, effectively practice thrift the cost, and occupation space is less, the stronger effect of practicality has.

In a specific embodiment, the first expansion valve 4 is set to be under-throttling, the refrigerant in the first connection pipe 100 of the main circulation loop 200 can control the flow rate of the refrigerant flowing to the silicone oil plate exchanger 23 through the under-throttling of the first expansion valve 4, so that the flow rate of the refrigerant in the first connection pipe 100 is matched with the heat exchange rate of the silicone oil plate exchanger 23, the refrigerant flows through the silicone oil plate exchanger 23 in a partial vapor state and partial liquid state, and the vapor state refrigerant exchanges heat with silicone oil in the silicone oil plate exchanger 23, so that the refrigerant absorbs heat for refrigeration, uniformly cools, realizes high heat exchange efficiency, reduces power consumption, and saves cost; the second expansion valve 5 is set to be completely throttled and used for controlling the opening and closing of the first connecting pipe 100 at the input end of the cold trap 1, so that the flow of the refrigerant in the first connecting pipe 100 is adjusted, the liquid refrigerant flowing to the second expansion valve from the silicone oil plate is completely throttled, the refrigerating capacity of the refrigerant is improved, the refrigerating depth of the cold trap is met, deep cooling refrigeration is provided for the cold trap, the problem that the refrigerating capacity of the traditional freeze-drying machine is not matched with the refrigerating depth is solved, a large refrigeration equipment component is not required to be selected, the whole volume of the equipment is small, the power consumption is reduced, the cost is effectively saved, and a small space is occupied.

As shown in fig. 3, in the specific embodiment, the first connection pipe 100 includes a first branch pipe 101 and a second branch pipe 102, the first expansion valve 4, the silicone oil plate exchanger 23 and the second expansion valve 5 are communicated through the first branch pipe 101, the second expansion valve 5, the first compressor 21, the heat exchanger 22 and the first expansion valve 4 are communicated through the second branch pipe 102, the refrigerant flows out from the first compressor 21 through the second branch pipe 102, is converted into a vapor-liquid state through incomplete throttling of the first expansion valve 4, and flows into the silicone oil plate exchanger 23 through the first branch pipe 101 between the first expansion valve 4 and the silicone oil plate exchanger 23, so as to exchange heat with silicone oil, thereby achieving the effect of heat absorption and refrigeration; the cold trap is connected between the second expansion valve 5 and the first compressor 21 through the second branch pipe 102, and the low-temperature vapor-liquid two-state refrigerant is completely throttled by the second expansion valve 5 when circulating through the first branch pipe 101, so that the refrigeration depth of the cold trap is met, and the effect of providing deep cooling refrigeration for the cold trap is achieved; in this embodiment, the first branch pipe 101 and the second branch pipe 102 are made of the same copper material, so that the heat transfer effect and the pressure-bearing effect are good, and the first branch pipe 101 and the second branch pipe 102 can be conveniently and tightly connected to each main refrigeration component.

In the embodiment, the input end of the heat exchanger 22 is connected to the output end of the first compressor 21, and the output end of the heat exchanger 22 is connected to the input end of the first expansion valve 4, in this embodiment, the heat exchanger 22 is a plate heat exchanger, which has a thin thickness and a light overall weight, has the characteristics of good heat transfer effect and high heat exchange efficiency, and is easy to install, occupies a small space, so that the overall volume of the freeze dryer equipment is small, the power consumption is reduced, and the freeze dryer equipment has a strong practicability effect, of course, in other embodiments, the heat exchanger may be a sleeve type heat exchanger or other types of heat exchangers, which also has the effects of good heat transfer effect and high heat exchange efficiency, the refrigerant can flow from the first compressor 21 to the heat exchanger 22 through the second branch pipe 102, so as to pre-cool the refrigerant with low temperature to flow to the first expansion valve 4, effectively improve the refrigeration efficiency and reduce the energy consumption.

As shown in fig. 2, in a specific embodiment, the freeze dryer refrigeration system further includes a pre-cooling unit 3, the pre-cooling unit 3 is configured to pre-cool the refrigeration unit 2, the pre-cooling unit 3 is connected to the main circulation loop 200 through a heat exchanger 22, the refrigerant is pre-cooled by the pre-cooling unit 3 to reduce the temperature, the low-temperature refrigerant circulates in the main circulation loop 200 through the heat exchanger 22, and the cryogenic refrigeration of the cold trap is realized through the first expansion valve 4, the silicone oil plate exchanger 23, and the second expansion valve 5, so that the refrigeration efficiency is high, the energy consumption of each component of the refrigeration system is reduced, and the effect of saving resources is achieved.

As shown in fig. 2-3, in a specific embodiment, the pre-cooling unit 3 includes a second compressor 31 and a condenser 32, the second compressor 31 is a high temperature compressor, the second compressor 31 and the condenser 32 are sequentially communicated with each other through a second connection pipe 300 to form a first branch circuit 400, the second compressor 31 provides power for the refrigerant to flow through the first connection pipe 100 in the first branch circuit 400, a third expansion valve 6 connected to an output end of the condenser 32 is further disposed on the first branch circuit 400, the heat exchanger 22 is connected between the second compressor 31 and the third expansion valve 6 through the second connection pipe 300, during a cold state, only the second compressor 32 is started, the second compressor 32 sends the compressed vapor refrigerant into the condenser 32, the condenser 32 converts the vapor refrigerant into a liquid state, the vapor refrigerant flows into the heat exchanger 22 through the second connection pipe 300, the refrigerant of the refrigeration unit 2 exchanges heat with the refrigerant of the pre-cooling unit 3 in the heat exchanger 22, the liquid refrigerant of the pre-cooling unit 3 absorbs heat and is changed into a vapor refrigerant, and then flows back to the second compressor 32 through the second connecting pipe 300 to form a cycle, so that the refrigerant of the refrigeration unit 2 is pre-cooled, and the effect of improving the refrigeration efficiency is achieved; the third expansion valve 6 is used for controlling opening and closing of the second connection pipe 300 communicated with the condenser 32, so as to adjust the flow rate of the refrigerant in the second connection pipe 300, so that the refrigerant in the first branch circuit 400 is matched with the flow rate of the refrigerant in the main circulation circuit 200, thereby facilitating heat exchange between the refrigerant in the refrigeration unit 2 and the refrigerant in the pre-cooling unit 3 in the heat exchanger 22, reducing power consumption and saving cost.

As shown in fig. 2, in a specific embodiment, the refrigeration system of the freeze dryer further includes a second branch circuit 500, the second branch circuit 500 is connected to the main circulation circuit 200 through the silicone oil plate exchanger 23, and the second branch circuit 500 is configured to allow silicone oil to circulate, so that the temperature of the silicone oil is raised and serves as a heat transfer medium, so that a part of liquid refrigerant that is not completely throttled by the first expansion valve 4 exchanges heat with the silicone oil with a higher temperature in the second branch circuit 500 in the silicone oil plate exchanger 23 to form a vaporization form of a part of refrigerant, the vapor refrigerant absorbs heat for refrigeration, and at the same time, the silicone oil in the silicone oil plate exchanger is cooled to form a circulation flow of the silicone oil, thereby achieving deep cooling refrigeration of the cold trap, and the refrigeration efficiency is higher.

As shown in fig. 3, in a specific embodiment, the refrigeration system of the freeze dryer further includes a third connection pipe 600 for allowing the silicone oil plate 23 to flow, the second branch loop 500 is provided with a water pump 231, a heater 232 and a partition 233 which are sequentially communicated through the third connection pipe 600, the silicone oil plate 23 is connected between the water pump 231 and the partition 233 through the third connection pipe 600, the water pump 231 provides power for the silicone oil in the third connection pipe 600, so that the silicone oil flows on the second branch loop 500, and the effect of raising the temperature of the silicone oil is achieved through heating by the heater 232, so that the refrigerant is converted into a vapor state through heat exchange between the silicone oil plate 23 and the silicone oil with a higher temperature, the vapor state refrigerant absorbs heat to refrigerate the silicone oil, thereby cooling the silicone oil, forming a circulating flow of the silicone oil, and realizing cryogenic refrigeration of the cold trap, and having higher refrigeration efficiency; the partition plate 233 can be provided with the condenser 32 for cooling the silicone oil to prevent all the refrigerant from being converted into a vapor state, so that the refrigerant exchanging heat with the silicone oil on the second branch loop 500 has two vapor-liquid states, the vapor-state refrigerant absorbs heat for refrigeration, the liquid-state refrigerant is completely throttled by the second expansion valve 5 and then flows back to the first compressor 21, the refrigeration depth of the cold trap is met, deep cooling refrigeration is provided for the cold trap, a circulating refrigeration mode is formed, and the problem that the refrigeration depth and the refrigeration capacity of the traditional freeze dryer are not matched is solved.

As shown in fig. 2-3, in a specific embodiment, an input end of the silicone oil plate exchanger 23 is connected to an output end of the first expansion valve 4, an output end of the silicone oil plate exchanger 23 is connected to an input end of the second expansion valve 5, so that the refrigerant can flow from the first expansion valve 4 to the silicone oil plate exchanger 23 through the first branch pipe 101 to exchange heat with the silicone oil in the silicone oil plate exchanger 23, and the refrigerant is converted into a vapor-liquid state, the vapor-state refrigerant absorbs heat for refrigeration, the liquid-state refrigerant is completely throttled by the second expansion valve 5 and then flows back to the first compressor 21, so as to meet the refrigeration depth of the cold trap, provide cryogenic refrigeration for the cold trap, form a circulating refrigeration mode, improve the refrigeration capacity, and solve the problem that the refrigeration depth of the conventional freeze dryer is not matched with the refrigeration capacity.

In a specific embodiment, an input end of the cold trap 1 is connected with an output end of the second expansion valve 5, an output end of the cold trap 1 is connected with an input end of the first compressor 21, and the refrigerant can flow from the second expansion valve 5 to the first compressor 21 through the second branch pipe 102 under the power provided by the first compressor 21, so that the refrigerant flowing through the refrigeration unit 3 flows back to the first compressor 21, the refrigerant circulates in the first connection pipe 100, a circulation refrigeration mode is formed, the refrigeration capacity is improved, and the effect of continuously providing deep cooling refrigeration for the cold trap is achieved; in this embodiment, plate heat exchanger is chooseed for use to heat exchanger 22, and plate heat exchanger's thickness is thin, and overall weight is lighter, has characteristics that heat transfer effect is good, heat exchange efficiency is high, easily installs simultaneously, and occupation space is less, makes the whole volume of freeze dryer equipment less, reduces power consumption, has the stronger effect of practicality, certainly, in other embodiments, the heat exchanger also can choose for use the heat exchanger of double-pipe heat exchanger or other types, has equally that heat transfer effect is good, effect that heat exchange efficiency is high.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims (7)

1. A freeze dryer refrigeration system, characterized by: including the cold trap and be used for the refrigerated refrigeration unit of cold trap, refrigeration unit and cold trap form the main loop through first connecting pipe intercommunication, refrigeration unit includes that first compressor, heat exchanger and silicon oil board trade, the main loop is established ties by first compressor, heat exchanger, first expansion valve, silicon oil board in proper order and is constituteed, and the refrigerant can be followed first compressor and is in to the heat exchanger direction through first connecting pipe circulation flow in the main loop, first expansion valve is established to incomplete throttle, the second expansion valve is established to complete throttle.

2. The lyophilizer refrigeration system of claim 1, characterized in that: the first connecting pipe comprises a first branch pipe and a second branch pipe, the first expansion valve and the silicon oil plate are communicated with the second expansion valve through the first branch pipe, and the second expansion valve, the first compressor, the heat exchanger and the first expansion valve are communicated through the second branch pipe.

3. The lyophilizer refrigeration system of claim 2, characterized in that: the input end of the heat exchanger is connected with the output end of the first compressor, and the output end of the heat exchanger is connected with the input end of the first expansion valve.

4. The lyophilizer refrigeration system of any of claims 1-3, characterized in that: the system also comprises a precooling unit for precooling the refrigerating unit, wherein the precooling unit is connected with the main circulation loop through the heat exchanger;

the pre-cooling unit comprises a second compressor and a condenser, the second compressor and the condenser are sequentially communicated through a second connecting pipe to form a first branch loop, a third expansion valve connected to the output end of the condenser is further arranged on the first branch loop, the heat exchanger is connected between the second compressor and the third expansion valve through a second connecting pipe, and heat exchange is carried out between a refrigerant in the refrigerating unit and the refrigerant in the pre-cooling unit in the heat exchanger.

5. The lyophilizer refrigeration system of claim 4, characterized in that: the silicon oil plate exchanger is characterized by also comprising a second branch loop, wherein the second branch loop is connected with the main circulation loop through the silicon oil plate exchanger.

6. The lyophilizer refrigeration system of claim 5, characterized in that: the silicone oil plate is provided with a third connecting pipe for the silicone oil to flow, a water pump, a heater and a partition board which are sequentially communicated through the third connecting pipe are arranged on the second branch loop, and the silicone oil plate is connected between the water pump and the partition board through the third connecting pipe.

7. The lyophilizer refrigeration system of claim 6, characterized in that: the input end of the silicone oil plate exchanger is connected with the output end of the first expansion valve, and the output end of the silicone oil plate exchanger is connected with the input end of the second expansion valve; the input end of the cold trap is connected with the output end of the second expansion valve, and the output end of the cold trap is connected with the input end of the first compressor; the heat exchanger is a plate heat exchanger.

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