阅读说明：本技术 用于冻干机的冷阱 (Cold trap for freeze dryer ) 是由 李所彬 于 2019-09-18 设计创作，主要内容包括：本发明涉及一种用于冻干机的冷阱,包括壳体和设于壳体内部的盘管组,盘管组包括适配于壳体中部的中间盘管组；中间盘管组包括多个彼此独立的中间盘管层,每个中间盘管层包括中间直管段以及中间弯管段,这些中间直管段以及中间弯管段连接后形成一层中间盘管层；所述盘管组还包括位于中间盘管组两侧且适配于壳体上部和下部的第一盘管组；其中：第一盘管组沿壳体纵向的长度与中间盘管组沿壳体纵向的长度不相等,第一盘管组包括第一直管段以及第一弯管段,这些第一直管段以及第一弯管段连接后形成至少两个第一盘管层,由多个第一盘管层形成的第一盘管组用于减缓冷却介质的流速以提供与各中间盘管层内冷却介质基本相同的流速。本发明可提高捕水效率。(The invention relates to a cold trap for a freeze dryer, which comprises a shell and a coil pipe group arranged in the shell, wherein the coil pipe group comprises a middle coil pipe group which is adaptive to the middle part of the shell; the middle coil pipe group comprises a plurality of middle coil pipe layers which are independent from each other, each middle coil pipe layer comprises a middle straight pipe section and a middle bent pipe section, and the middle straight pipe sections and the middle bent pipe sections are connected to form a middle coil pipe layer; the coil group also comprises first coil groups which are positioned at two sides of the middle coil group and are adapted to the upper part and the lower part of the shell; wherein: the length of the first coil group along the longitudinal direction of the shell is not equal to the length of the intermediate coil group along the longitudinal direction of the shell, the first coil group comprises first straight pipe sections and first bent pipe sections, the first straight pipe sections and the first bent pipe sections are connected to form at least two first coil layers, and the first coil group formed by the plurality of first coil layers is used for reducing the flow velocity of the cooling medium to provide the flow velocity which is basically the same as the flow velocity of the cooling medium in each intermediate coil layer. The invention can improve the water catching efficiency.)

1. A cold trap for freeze dryer, including the casing with locate the inside coil pipe group of casing, coil pipe group is including the middle coil pipe group of adaptation in casing middle part, its characterized in that:

the middle coil pipe group comprises a plurality of middle coil pipe layers which are independent from each other, each middle coil pipe layer comprises a middle straight pipe section and a middle bent pipe section, and the middle straight pipe sections and the middle bent pipe sections are connected to form a middle coil pipe layer;

the coil group also comprises first coil groups which are positioned at two sides of the middle coil group and are adapted to the upper part and the lower part of the shell; wherein:

the length of the first coil group along the longitudinal direction of the shell is not equal to the length of the intermediate coil group along the longitudinal direction of the shell, the first coil group comprises first straight pipe sections and first bent pipe sections, the first straight pipe sections and the first bent pipe sections are connected to form at least two first coil layers, and the first coil group formed by the plurality of first coil layers is used for reducing the flow velocity of the cooling medium to provide the flow velocity which is basically the same as the flow velocity of the cooling medium in each intermediate coil layer.

2. A cold trap for a freeze dryer according to claim 1, wherein the cold trap further comprises a second coil set for slowing the flow rate of the cooling medium to provide substantially the same flow rate as the cooling medium in each intermediate coil layer, the second coil set being located between the first coil set and the intermediate coil set.

3. A cold trap for a freeze dryer according to claim 2, wherein the second coil group is formed by connecting a plurality of second straight tube sections, second bent tube sections, and a reducing tube section for reducing the flow rate of the cooling medium.

4. A cold trap for a freeze dryer according to claim 3 wherein the slow down tube sections of the second coil set are distributed at the input and output ends of the second coil set.

5. The cold trap for a freeze dryer according to claim 3, wherein the second straight pipe section and the second bent pipe section are connected to form at least a second coil layer for extending a flow path of the cooling medium to slow down a flow rate of the cooling medium.

6. The cold trap for a lyophilizer of claim 2, wherein the width of the second coil set in the transverse direction of the housing is smaller than the width of the intermediate coil layer in the transverse direction of the housing.

7. The cold trap for a lyophilizer of claim 3, wherein said relief tube segment comprises:

the first bending section is provided with a first bending part and a second bending part, and the bending directions of the first bending part and the second bending part are opposite;

a middle connecting section, one end of the middle connecting section is connected with one end of the first bending section,

and a second bending section having a third bending part, one end of the second bending section being connected with the other end of the intermediate connecting section.

8. The cold trap for a freeze dryer according to claim 1, wherein a plurality of first coil layers are arranged up and down, and the width of each first coil layer along the transverse direction of the housing is not equal to and smaller than the width of the intermediate coil layer along the transverse direction of the housing.

9. A cold trap for a freeze dryer according to any one of claims 1 to 8, wherein the cold trap further comprises support means for the coil sets, the support means being fixed to the inner wall of the housing, the support means comprising:

a polygonal frame surrounding the coil group;

the fixing parts are fixed with the frame and are respectively connected and fixed with each straight pipe section in the coil pipe group;

and the mounting assembly is fixed with the frame and fixed with the inner wall of the shell.

10. A cold trap for a freeze dryer according to any one of claims 1 to 8, wherein the cold trap further comprises a defrost tube providing a flow path for the heating medium to evaporate water located at the bottom of the housing to vaporise a layer of ice condensed on the coil array within the vacuum environment.

Technical Field

The invention relates to the technical field of evaporative crystallization, in particular to a cold trap for a freeze dryer.

Background

The freeze dryer comprises a freeze drying box, a cold trap and a vacuum pump, wherein one side of the cold trap is connected with the freeze drying box, the other side of the cold trap is connected with the vacuum pump, and the gas in the freeze drying box and the cold trap flows in the direction of the vacuum pump through the negative pressure generated by the vacuum pump. The freeze-drying incasement is provided with parts such as sheet layer for place freeze-drying product. The cold trap is another vacuum container in the freeze dryer, the container contains a plurality of groups of coil pipes, refrigerant medium in the coil pipes circularly flows, the coil pipes are at a lower temperature and used for absorbing water vapor sublimated from a freeze-dried product in the freeze-drying box body through the coil pipes and the refrigerant medium, and the water vapor sublimated from the product is condensed on the coil pipes to form an ice layer when meeting cold, so that the function of capturing water is achieved.

The environment inside the cold trap tends to be a vacuum due to the pumping action of the vacuum pump. However, it has been found that if the temperature difference between the input end and the output end of the coil pipe in the vacuum environment is greater than 8 ℃, a part of water molecules will drift to the low-temperature ice layer, and another part of water molecules is directly pumped away by the vacuum pump on the high-temperature side. Due to the temperature difference, the efficiency of water capture is reduced. For example, the temperature at the input of the coil is-42 deg.C and the temperature at the output of the coil is-32 deg.C, so that non-uniform temperatures occur during the flow of the refrigerant medium along the coil.

Disclosure of Invention

Based on the condition of overlarge temperature difference, research shows that even if the speed of refrigerant medium input to the input end of each layer of coil pipe is the same, the structure of each layer of coil pipe is arranged according to the shape of the cold trap shell, so that the flow speed difference of the refrigerant medium in each layer of coil pipe is overlarge, the capturing speed of water vapor sublimated from a freeze-dried product by each layer of coil pipe is different, the temperature difference occurs among the coil pipes, and the water molecule drift and the adverse effect of low water capturing efficiency are caused.

The invention aims to provide a cold trap for a freeze dryer, which can improve the water capturing efficiency.

The technical scheme for solving the problems is as follows:

the cold trap for the freeze dryer comprises a shell and a coil set arranged in the shell, wherein the coil set comprises a middle coil set which is matched with the middle part of the shell;

the middle coil pipe group comprises a plurality of middle coil pipe layers which are independent from each other, each middle coil pipe layer comprises a middle straight pipe section and a middle bent pipe section, and the middle straight pipe sections and the middle bent pipe sections are connected to form a middle coil pipe layer;

the coil group also comprises first coil groups which are positioned at two sides of the middle coil group and are adapted to the upper part and the lower part of the shell; wherein:

the length of the first coil group along the longitudinal direction of the shell is not equal to the length of the intermediate coil group along the longitudinal direction of the shell, the first coil group comprises first straight pipe sections and first bent pipe sections, the first straight pipe sections and the first bent pipe sections are connected to form at least two first coil layers, and the first coil group formed by the plurality of first coil layers is used for reducing the flow velocity of the cooling medium to provide the flow velocity which is basically the same as the flow velocity of the cooling medium in each intermediate coil layer.

The invention has the advantages that: through setting up the first coil layer of multilayer, the quantity of the first bend section in first coil layer is more than the quantity of middle bend section, with the resistance that increases coolant in first coil group, make coolant the intraformational velocity of flow of first coil group and middle coil basically the same from this, make the difference in temperature of first coil group and middle coil layer reduce or reach basically the same degree, the probability that the hydrone drifts to low temperature ice layer has been reduced, and then the water catch homogeneity of each layer of coil pipe and the water catch capacity of each layer of coil pipe have been promoted, make the efficiency of catching water obtain improving. As the uniformity of water capture is improved, compared with the similar products, such as a coil unit with the same size of 200 square meters, the cold trap has the water capture amount of 5 tons through experimental verification, and other cold traps of the same type only have 3 tons. Therefore, compared with the similar products, the water catching amount of the invention is greatly improved.

Drawings

FIG. 1 is a schematic diagram of a cold trap for a lyophilizer of the present invention;

FIG. 2 is a schematic view of the case of FIG. 1 with the case hidden;

FIG. 3 is a schematic view of one of the intermediate coil layers of the intermediate coil assembly;

FIG. 4 is a schematic view of a first coil set;

FIG. 5 is a schematic view of a second coil set;

FIG. 6 is a schematic view of a buffer tube section;

reference numbers in the drawings:

1 is a cylinder body, 2 is a front end cover, 3 is a rear end cover, 4 is an input end, 5 is a supporting seat, and 6 is a viewing mirror flange;

7 is an input header pipe, and 8 is an output header pipe;

a is an intermediate coil group, A1 is an intermediate coil layer, 10 is an intermediate straight pipe section, and 11 is an intermediate bent pipe section;

b is a first coil pipe group, B1 is a first coil pipe layer, 12 is a first straight pipe section, and 13 is a first bent pipe section;

c is a second coil group, C1 is a second coil layer, 14 is a second straight pipe section, 15 is a second bent pipe section, 16 is a relief pipe section, 16a is a first bent section, 16b is an intermediate connection section, 16C is a second bent section, 16d is a first bent section, 16e is a second bent section, and 16f is a third bent section;

17 is a frame, 18 is a fixed part, 19 is a connecting plate, 20 is a connecting seat, and 21 is a mounting seat;

and 22 is a defrosting pipe.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the cold trap for a freeze dryer of the present invention comprises a housing and a coil set disposed inside the housing, and the following describes the relationship between the components:

the casing includes barrel 1, front end housing 2, rear end housing 3, and the cross-section of barrel 1 preferentially adopts circularly, and the both ends of barrel 1 have the opening, and front end housing 2 and rear end housing 3 are fixed respectively at the both ends of barrel 1.

The housing is provided with an input end 4 for connecting the freeze-drying box, preferably, the input end 4 is arranged on the cylinder body 1, and the input end 4 can also be arranged on the front end cover 2 and the rear end cover 3.

The casing still includes supporting seat 5, and supporting seat 5 is global fixed with barrel 1, and supporting seat 5 includes the arc and the base of being connected with the arc, is equipped with the arc on the supporting seat 5 sunken, and the arc is located the arc sunken and with base welded fastening, the arc with the global welding of barrel 1.

The casing still includes sight glass flange 6, is equipped with the mounting hole on barrel 1 global, and sight glass flange 6 is arranged in the mounting hole and is fixed with barrel 1, can be convenient for observe the environment in the barrel 1 through sight glass flange 6.

An input manifold 7 and an output manifold 8 for cooling media are arranged on the shell, the input manifold 7 and the output manifold 8 are arranged along the radial direction of the cylinder 1 and are fixed with the cylinder 1, and one end of the input manifold 7 and one end of the output manifold 8 are closed, and the other end of the input manifold 7 and the other end of the output manifold 8 are provided with openings. A plurality of first fitting holes are formed in the input manifold 7 in the longitudinal direction of the input manifold 7, and a plurality of second fitting holes are formed in the output manifold 8 in the longitudinal direction of the output manifold 8, the first and second fitting holes being used for mounting the coil block.

The cooling medium supplied to the input manifold 7 is distributed to the coil groups through these first fitting holes, and after flowing along the path in which the coil groups are mounted, the cooling medium is collected into the output manifold 8 through the second fitting holes, and is then supplied from the output manifold 8 to a predetermined position, such as a cooling medium header box, to which the input manifold 7 and the output manifold 8 are connected, respectively.

The coil group comprises a middle coil group A which is adapted to the middle part of the shell and first coil groups B which are positioned at two sides of the middle coil group and are adapted to the upper part and the lower part of the shell. The structures of the intermediate disc tube group a and the first disc tube group B will be specifically described below:

the intermediate coil group a comprises a plurality of independent intermediate coil layers a1, the number of layers of the intermediate coil layers a1 preferably being 10 and arranged from top to bottom. Each intermediate coil layer a1 includes an intermediate straight pipe section 10 and an intermediate bent pipe section 11, the intermediate straight pipe section 10 and the intermediate bent pipe section 11 are connected to form an intermediate coil layer a1, and the intermediate bent pipe section 11 is in a C-shaped or U-shaped structure.

One end of each intermediate manifold layer a1 mates with one of the first mounting holes on the input manifold 7 and the other end of the intermediate manifold layer a1 mates with one of the second mounting holes on the output manifold 8. The two adjacent intermediate tray layers a1 are parallel to each other.

The length of the first coil group B in the longitudinal direction of the casing is not equal to the length of the intermediate coil group a in the longitudinal direction of the casing, and preferably, the length of the first coil group B in the longitudinal direction of the casing is greater than the length of the intermediate coil group a in the longitudinal direction of the casing. In the present invention, the longitudinal direction of the housing is a direction parallel to the axial direction of the cylinder 1.

One end of the first coil group B is fitted into one of the first fitting holes of the input manifold 7, and the other end of the first coil group B is fitted into one of the second fitting holes of the output manifold 8. The cooling medium supplied to the first coil group B through the supply manifold 7 flows along the path of the first coil group B and then is merged into the discharge manifold 8.

The first coil group B includes first straight pipe sections 12 and first bent pipe sections 13, and the first straight pipe sections 12 and the first bent pipe sections 13 are connected to form at least two first coil layers B1, where for the relationship between the plurality of first coil layers B1, the output end of one first coil layer B1 is connected to the input end of another adjacent first coil layer B1, that is, the tail and head of two adjacent first coil layers B1 are connected.

The first coil group B formed of the plurality of first coil layers B1 is used to slow the flow rate of the cooling medium to provide substantially the same flow rate as the cooling medium in each of the intermediate coil layers a 1. The plurality of first coil layers B1 are arranged up and down, and the width of each first coil layer B1 in the transverse direction of the shell is not equal to or less than the width of the middle coil layer in the transverse direction of the shell. When the first coil group B and the intermediate coil group a are mounted on the input manifold 7 and the output manifold 8, the coil groups have a polygonal structure, which has the following advantages:

the middle coil group A in the middle of the cylinder is installed to be cuboid, the first coil group B is arranged in a trapezoid shape, the first coil group B is preferably arranged to be isosceles trapezoid, the cross section of the cylinder 1 is circular, the transverse width of the cylinder 1 is gradually reduced from the middle of the cylinder 1 to the upper side and the lower side of the cylinder 1, therefore, the width of each first coil layer B1 along the transverse direction of the shell is unequal and less than that of the middle coil layer along the transverse direction of the shell, the length of the flow path of the first coil layer B1 is less than that of the flow path of the middle coil layer A1, by arranging a plurality of first coil layers B1, the number of first bend sections 13 in the first coil layer B1 is more than that of the middle bend sections 11, so as to increase the resistance of the cooling medium in the first coil group B, thereby the flow rate of the cooling medium in the first coil group B and the middle coil group A1 is basically the same, the temperature difference between the first coil pipe group B and the middle coil pipe layer A1 is reduced or reaches the same degree, so that the probability of drifting of water molecules to a low-temperature ice layer is reduced, the water capture efficiency of each layer of coil pipe is improved, and the water capture efficiency is improved.

The shape of the middle coil group A and the first coil group B which are integrally formed after being combined is a polygon, so that the space in the cylinder body 1 can be utilized to the maximum extent, more pipelines for condensing sublimed water vapor in a freeze-dried product can be arranged in the cylinder body 1, and because the width of the first coil layer B1 is smaller than that of the middle coil layer A1, more pipelines for condensing sublimed water vapor in the freeze-dried product can be arranged in the cylinder body 1 through the arrangement of a plurality of layers of first coil layers B1, and meanwhile, the width of the middle coil layer A1 is increased, so that the space utilization rate between the middle coil layer A1 and the inner wall of the cylinder body 1 is improved, and the structural combination of the middle coil group A and the first coil group B improves the space utilization rate in the cylinder body 1, so that the vacuum establishing efficiency in the cylinder body is higher, and the water capturing efficiency is improved.

The cold trap further includes a second coil group C for slowing the flow rate of the cooling medium to provide substantially the same flow rate as the cooling medium in each intermediate coil layer a1, the second coil group C being located between the first coil group B and the intermediate coil group a. The width of the second coil group C in the lateral direction of the casing is smaller than the width of the intermediate coil layer a1 in the lateral direction of the casing. The function of the second coil group C is the same as that of the first coil group B, and will not be described again.

One end of the second coil group C is fitted into one of the first fitting holes of the input manifold 7, and the other end of the second coil group C is fitted into one of the second fitting holes of the output manifold 8. The cooling medium supplied to the second coil group C through the supply manifold 7 flows along the path of the second coil group C and then is merged into the discharge manifold 8.

The second coil group C is formed by connecting a plurality of second straight pipe sections 14, second bent pipe sections 15, and a reducing pipe section 16 that reduces the flow rate of the cooling medium. Since the second coil group C has a smaller width in the lateral direction of the casing than the intermediate coil layer a1, the cooling medium flows faster in the second coil group C than in the intermediate coil layer a1, thereby slowing down the flow rate of the cooling medium by increasing the velocity behind the slow down tube section 16.

The mitigation pipe section 16 includes: a first curved section 16a, an intermediate connecting section 16b, and a second curved section 16c, wherein the first curved section 16a has a first curved portion 16d and a second curved portion 16e, and the curved directions of the first curved portion 16d and the second curved portion 16e are opposite; one end of the intermediate connecting section 16b is connected to one end of the first bent section 16a, and one end of the second bent section 16c having the third bent portion 16f is connected to the other end of the intermediate connecting section 16 b. The flow of the cooling medium is impeded by the plurality of bent portions on the first bent section 16a and the second bent section 16C to help reduce the flow rate of the cooling medium flowing along the second coil group C.

Due to the multiple bends of the buffer tube section 16, the buffer tube sections 16 of the second coil group C are preferably distributed at the input end and the output end of the second coil group C to avoid short-circuiting due to freezing of the cooling medium due to too many bends when the buffer tube sections 16 are in the middle position of the second coil group C.

The second straight pipe section 14 and the second bend pipe section 15 are connected to form at least a plurality of second coil layers C1 for extending the flow path of the cooling medium to slow down the flow rate of the cooling medium, the plurality of second coil layers C1 are arranged on the same horizontal plane, and for the relationship among the plurality of second coil layers C1, the output end of one second coil layer C1 is connected with the input end of another adjacent second coil layer C1, that is, the tail ends of two adjacent first coil layers B1 are connected.

The plurality of second coil layers C1 are arranged along the longitudinal direction of the shell, and the width of each second coil layer C1 along the transverse direction of the shell is equal to and smaller than the width of the middle coil layer along the transverse direction of the shell. Preferably, the number of the second coil layers C1 is two. The second bend section 15 is C-shaped or U-shaped.

After arranging the plurality of layers of the second coil layer C1, the number of the second elbow sections 15 is greater than the number of the intermediate elbow sections 11 in the intermediate coil layer a1, so that the plurality of layers of the second coil layer C1 further help to reduce the flow rate of the cooling medium flowing along the second coil group C, thereby achieving the purpose of making the flow rate of the cooling medium in the second coil group C and the intermediate coil layer a1 substantially the same.

In addition, a second coil group C is arranged between the first coil group B and the middle coil group A, and plays a role of transition, wherein the transition mainly means that the coil groups are enabled to form a polygonal shape, the number of layers of the first coil layers B1 forming the first coil group B is reduced, the manufacturing difficulty of the first coil group B is reduced, and the manufacturing precision is improved.

The cold trap further comprises a support device for the coil pack, the support device being fixed to the inner wall of the housing, the support device comprising:

the coil pipe group fixing device comprises a polygonal frame 17, a plurality of fixing parts 18 fixed with the frame 17 and a mounting assembly, wherein the frame 17 surrounds the coil pipe group, and the coil pipe group is surrounded by the frame 17, so that the coil pipe group is prevented from being scattered. The fixing members 18 are connected and fixed to the respective straight pipe sections of the coil group, the fixing members 18 are preferably bar members such as flat steel, both ends of the fixing members 18 extend in the up-down direction of the coil group, and the fixing members 18 are fixed to the straight pipe sections and the frame 17.

The mounting assembly is fixed to the frame 17 and the mounting assembly is fixed to the inner wall of the housing. The mounting assembly comprises a connecting plate 19, a connecting seat 20 and a mounting seat 21, wherein the connecting plate 19 is fixed with the frame 17, the connecting plate 19 is fixed with the connecting seat 20, the connecting seat 20 is fixed with the mounting seat 21, and the mounting seat 21 is fixed with the inner wall of the barrel 1.

The fixing in the embodiment refers to a welding fixing mode or a bolt connecting mode, and the welding fixing mode is preferentially adopted.

The cold trap also includes a defrost tube 22 that provides a flow path for the heating medium to evaporate water located at the bottom of the housing to vaporize a layer of ice that condenses on the coil array within the vacuum environment. Because the environment in the cylinder 1 is vacuum, the vacuum degree is below 3 kilopascal, and the temperature required by the vaporization of the ice layer is reduced in the environment with the pressure value, a heating medium is input into the defrosting pipe 22, so that the water at the bottom of the shell is vaporized, the vaporized steam acts on the ice layer condensed on the coil pipe group, and the ice layer is heated and thawed into water.

Based on the defrosting mode, namely defrosting 22 in a low-temperature and low-pressure environment, not only can energy consumption be reduced, but also the temperature of the cooling medium flowing along the coil group can be prevented from being influenced. The reason for this is that the low pressure environment causes the water to evaporate at a low temperature, for example at 20 degrees celsius, at which the formed steam exchanges heat with the ice layer that condenses on the coil assembly, thus melting the ice layer, and the low temperature steam exchanges heat with the cooling medium in the coil assembly after the heat exchange, since its temperature itself is low, thus having little or no effect on the cooling medium, thus ensuring that the temperature of the cooling medium is affected.

In addition, for the low-temperature and low-pressure deicing mode, the ice layer is formed by condensing water vapor sublimated from the freeze-dried products, the freeze-dried products are generally flowers or fruits, the water vapor sublimated from the freeze-dried products contains aromatic substances, deicing is carried out in a low-temperature environment, cellular fluid of the aromatic substances is not damaged, and the cellular fluid is extracted from the melted ice water and is subjected to secondary utilization, and the products such as facial masks, soap, moisturizing cream and the like can be prepared.