Refrigerating system energy-saving control mechanism for ice melting of cold trap of freeze drying equipment
By setting up a control mechanism in the return pipeline of the freeze-drying equipment, it is ensured that there is liquid refrigerant in the cold trap refrigeration coil, which solves the high energy consumption problem caused by the complete vaporization of the refrigerant when the cold trap melts ice, and achieves the energy-saving effect of the equipment.
Patent Information
- Application Number
- CN202420940660.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-04
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-04
AI Technical Summary
When the cold trap refrigeration drain pipe melts ice, the existing freeze-drying equipment causes all the refrigerant to vaporize, resulting in higher energy consumption when the equipment is re-used.
By setting up a return valve, an adjustable bypass valve and pressure gauge in the return air pipeline, the pressure in the cold trap refrigeration coil is controlled to ensure that there is still liquid refrigerant when the cold trap melts ice, reduce the amount of refrigerant vaporization, and avoid Power consumption of refrigeration compressor.
It realizes the reduction of power consumption of the refrigeration compressor when the freeze-drying equipment is working again, reduces energy consumption, and improves the energy-saving effect of the equipment.
Smart Images
Figure CN222210990U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy-saving control mechanisms, in particular to an energy-saving control mechanism for a refrigeration system when a cold trap of a freeze-drying device melts ice. Background Art
[0002] Food freeze drying technology is an advanced food drying technology that freezes the water in food into ice crystals based on the equilibrium relationship between the three phases of water: solid, liquid and gas. Under low temperature and low pressure conditions, the water in the food is directly converted from ice crystals into water vapor and discharged, thereby dehydrating the food. The water vapor is discharged by the surface of the cold trap refrigeration pipe in the refrigeration system, which is adsorbed into ice at low temperature and low pressure.
[0003] When conventional freeze-drying equipment completes its work and the ice in the cold trap refrigeration pipe melts, the refrigerant in the refrigeration pipe will be vaporized into gas and exist in the system due to the increase in ambient temperature. When the freeze-drying equipment is working again in a short period of time, the refrigeration system needs to work again to make the refrigerant in the cold trap refrigeration pipe in a gas-liquid two-phase state. This part of the liquid phase is achieved by consuming power of the refrigeration system compressor, resulting in high energy consumption when the equipment is used again. Therefore, improvements are needed. Utility Model Content
[0004] The utility model aims to provide an energy-saving control mechanism for a refrigeration system when a cold trap of a freeze-drying device melts ice, thereby solving the problem of high energy consumption of the existing freeze-drying device.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an energy-saving control mechanism for a refrigeration system when a cold trap of a freeze-drying device melts ice, comprising a drying bin, a bin door is provided on the left side of the drying bin, a heating plate is provided on the upper inner portion of the drying bin, processed food is placed on the horizontal portion of the heating plate, a cold trap is provided on the lower inner portion of the drying bin, a refrigeration coil is provided on the inner side of the cold trap, one end of the refrigeration coil is fixedly connected to a refrigeration system liquid supply pipe, the refrigeration system liquid supply pipe passes through the drying bin and extends to the outside of the drying bin, the other end of the refrigeration coil is fixedly connected to a refrigeration system return air pipe, and a melting ice steam pipe, a melting ice drainage pipe and a vacuum system suction pipe are fixedly connected to the side wall of the drying bin, and the positions of the melting ice steam pipe and the melting ice drainage pipe are symmetrical.
[0006] Preferably, the heating plate is of continuous bending type and made of stainless steel. By setting the heating plate to be of continuous bending type, it is convenient to hold more processed food.
[0007] Preferably, an openable and closable door panel is provided inside the drying chamber and between the cold trap and the heating plate. The openable and closable door panel facilitates the blocking of the cold trap.
[0008] Preferably, a refrigeration circulation pump and a liquid supply valve are provided in the middle section of the liquid supply pipe of the refrigeration system. The refrigeration circulation pump can transport liquid refrigerant to the refrigeration coil.
[0009] Preferably, a branch pipe is provided in the middle section of the return pipe of the refrigeration system, a pressure gauge is provided at the end of the branch pipe, a return valve is provided in the middle section of the return pipe of the refrigeration system, and a bypass adjustable valve is connected between the end section of the return pipe of the refrigeration system and the middle section of the branch pipe through a pipeline. When the cold trap is passed through the steam refrigeration coil to melt the ice, the liquid supply valve and the return valve are closed, and the bypass adjustable valve is adjusted to control the pressure in the cold coil to reduce the amount of refrigerant vaporization in the refrigeration coil.
[0010] Preferably, one end of the heating plate is fixedly connected to a hot water system water inlet pipe, which passes through the drying bin and extends to the outside of the drying bin, and the other end of the heating plate is fixedly connected to a hot water system water return pipe, which passes through the drying bin and extends to the outside of the drying bin. By setting the hot water system water inlet pipe and the hot water system water return pipe, the hot water in and out of the heating plate can be controlled.
[0011] The beneficial effects of the utility model are as follows:
[0012] The utility model adds a group of mechanisms for controlling the pressure in the refrigeration coil when the cold trap melts ice in the return air pipeline, including a return air valve, a bypass adjustable valve and a pressure gauge. Under the action of this safe use pressure, a certain quality of liquid refrigerant still exists in the cold trap refrigeration coil. When the freeze-drying equipment works again in a short time, this part of the liquid refrigerant can avoid the power consumption of the refrigeration compressor, thereby achieving energy saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is the front view of the utility model;
[0014] Figure 2 It is a left view of the utility model;
[0015] Figure 3 For the utility model Figure 2 Schematic diagram of general instructions for use;
[0016] Figure 4 For the utility model Figure 3 A is an enlarged view.
[0017] In the figure: 1. Drying chamber; 2. Chamber door; 3. Heating plate; 4. Cold trap; 5. Openable and closable door panel; 6. Refrigeration coil; 7. Refrigeration circulation pump; 8. Liquid supply valve; 9. Return air valve; 10. Bypass adjustable valve; 11. Pressure gauge; 12. Processed food; 13. Refrigeration system liquid supply pipe; 14. Hot water system water inlet pipe; 15. Hot water system return pipe; 16. Vacuum system suction pipe; 17. Refrigeration system return pipe; 18. Ice-melting steam pipe; 19. Ice-melting drainage pipe. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] See also Figure 1-3 , an energy-saving control mechanism for a refrigeration system when a cold trap of a freeze-drying device melts ice, comprising a drying chamber 1, a chamber door 2 is arranged on the left side of the drying chamber 1, a heating plate 3 is arranged on the upper inner side of the drying chamber 1, and the heating plate 3 is a continuous bending type and made of stainless steel. By setting the heating plate 3 to be a continuous bending type, it is convenient to hold more processed food 12, and the processed food 12 is placed on the horizontal part of the heating plate 3.
[0020] See also Figure 1-4 A cold trap 4 is provided at the lower inner part of the drying chamber 1, and an openable and closable door panel 5 is provided at the inner side of the drying chamber 1 and between the cold trap 4 and the heating plate 3. The openable and closable door panel 5 facilitates the blocking of the cold trap 4. A refrigeration coil 6 is provided at the inner side of the cold trap 4, and one end of the refrigeration coil 6 is fixedly connected to a refrigeration system liquid supply pipe 13, which passes through the drying chamber 1 and extends to the outside of the drying chamber 1. A refrigeration circulation pump 7 and a liquid supply valve 8 are provided in the middle section of the refrigeration system liquid supply pipe 13. Liquid refrigerant can be transported to the refrigeration coil 6 through the refrigeration circulation pump 7, and the other end of the refrigeration coil 6 is fixedly connected to a refrigeration system return air pipe 17. The side wall of the drying chamber 1 is fixedly connected to an ice-melting steam pipe 18, an ice-melting drainage pipe 19 and a vacuum system suction pipe 16, and the positions of the ice-melting steam pipe 18 and the ice-melting drainage pipe 19 are symmetrical.
[0021] See also Figure 2-3The middle section of the return pipe 17 of the refrigeration system is provided with a branch pipe, the end of the branch pipe is provided with a pressure gauge 11, the middle section of the return pipe 17 of the refrigeration system is provided with a return valve 9, and the end section of the return pipe 17 of the refrigeration system and the middle section of the branch pipe are connected by a bypass adjustable valve 10. When the cold trap 4 is introduced into the steam refrigeration coil 6 to melt the ice, the liquid supply valve 8 and the return valve 9 are closed, and the bypass adjustable valve 10 is adjusted to control the pressure in the cold coil 6, thereby reducing the amount of refrigerant vaporization in the refrigeration coil 6.
[0022] See also Figure 2-3 One end of the heating plate 3 is fixedly connected with a hot water system water inlet pipe 14, which penetrates the drying chamber 1 and extends to the outside of the drying chamber 1. The other end of the heating plate 3 is fixedly connected with a hot water system water return pipe 15, which penetrates the drying chamber 1 and extends to the outside of the drying chamber 1. Through the arrangement of the hot water system water inlet pipe 14 and the hot water system water return pipe 15, the hot water in and out of the heating plate 3 can be controlled.
[0023] The specific implementation process of the utility model is as follows: the frozen processed food 12 is placed on the heating plate 3, the door 2 is closed, the openable and closable door plate 5 of the cold trap 4 is opened, the valve is opened, and each system works until the processed food 12 is dried, the heating system and the vacuum system are turned off, the refrigeration circulation pump 7 is turned off, the main valve is closed, the openable and closable door plate 5 of the cold trap 4 is closed, the door 2 is opened, the dried food is taken out, and the cold trap 4 is connected to the steam refrigeration coil 6 to melt the ice until the ice melting is completed to complete a freeze-drying equipment working cycle;
[0024] In addition, when the freeze drying equipment works for the first time, the return valve 9 is opened, the bypass adjustable valve 10 is opened, and the refrigeration system works normally. At this time, the refrigerant in the refrigeration coil 6 of the cold trap 4 is in a gas-liquid two-phase state. When the freeze drying equipment ends, the liquid supply valve 8 and the return valve 9 of the refrigeration coil 6 are closed before the refrigeration coil 6 of the cold trap 4 melts. As the refrigeration coil 6 of the cold trap 4 melts, the ambient temperature rises, the refrigerant in the refrigeration coil 6 absorbs heat and gradually vaporizes, and the pressure gradually increases. The bypass adjustable valve 10 is adjusted and the pressure gauge 11 is observed until the pressure in front of the gauge is close to the pipeline safety pressure setting value. At this time, as the refrigeration coil 6 ends to melt, the maximum value of the pressure gauge 11 is the safe use pressure of the refrigerant in the refrigeration coil 6, and the adjustment of the bypass adjustable valve 10 is completed. At this time, under the action of this safe use pressure, a certain mass of liquid refrigerant still exists in the cold refrigeration coil 6, and this part of the liquid refrigerant can be exempted from the power consumption of the refrigeration compressor when the freeze drying equipment works again in a short time, thereby achieving energy saving.
[0025] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A refrigeration system energy-saving control mechanism for a freeze-drying device when a cold trap melts ice, comprising a drying chamber (1), characterized in that: A door (2) is provided on the left side of the drying bin (1); a heating plate (3) is provided on the upper inner part of the drying bin (1); processed food (12) is placed on the horizontal part of the heating plate (3); a cold trap (4) is provided on the lower inner part of the drying bin (1); a refrigeration coil (6) is provided on the inner side of the cold trap (4); one end of the refrigeration coil (6) is fixedly connected to a refrigeration system liquid supply pipe (13); the refrigeration system liquid supply pipe (13) passes through the drying bin (1) and extends to the outside of the drying bin (1); the other end of the refrigeration coil (6) is fixedly connected to a refrigeration system return air pipe (17); a de-ice steam pipe (18), a de-ice drainage pipe (19) and a vacuum system suction pipe (16) are fixedly connected to the side wall of the drying bin (1); and the positions of the de-ice steam pipe (18) and the de-ice drainage pipe (19) are symmetrical.
2. The energy-saving control mechanism for the refrigeration system of a freeze-drying equipment when the cold trap melts ice according to claim 1, characterized in that: The heating plate (3) is of a continuously bent type and is made of stainless steel.
3. The energy-saving control mechanism for the refrigeration system of a freeze-drying equipment when the cold trap melts ice according to claim 1, characterized in that: An openable and closable door panel (5) is provided inside the drying chamber (1) and between the cold trap (4) and the heating plate (3).
4. The energy-saving control mechanism for the refrigeration system of a freeze-drying equipment when the cold trap melts ice according to claim 1, characterized in that: A refrigeration circulation pump (7) and a liquid supply valve (8) are provided in the middle section of the refrigeration system liquid supply pipe (13).
5. The energy-saving control mechanism for the refrigeration system of a freeze-drying equipment when the cold trap melts ice according to claim 1, characterized in that: A branch pipe is provided in the middle section of the refrigeration system return pipe (17), a pressure gauge (11) is provided at the end of the branch pipe, a return valve (9) is provided in the middle section of the refrigeration system return pipe (17), and a bypass adjustable valve (10) is connected between the end section of the refrigeration system return pipe (17) and the middle section of the branch pipe through a pipeline.
6. The energy-saving control mechanism for the refrigeration system of a freeze-drying equipment when the cold trap melts ice according to claim 1, characterized in that: One end of the heating plate (3) is fixedly connected to a hot water system water inlet pipe (14), the hot water system water inlet pipe (14) passes through the drying bin (1) and extends to the outside of the drying bin (1), and the other end of the heating plate (3) is fixedly connected to a hot water system water return pipe (15), the hot water system water return pipe (15) passes through the drying bin (1) and extends to the outside of the drying bin (1).