Freezing type drying machine with stable pressure dew point

Abstract

The utility model relates to the field of refrigerated dryer production, in particular to a refrigerated dryer with a stable pressure dew point, which comprises a compressor, an evaporator, a capillary tube, a condenser, a constant-pressure energy regulating valve and a PLC (programmable logic controller) module, one end of the compressor is connected with the evaporator, and the other end of the compressor is respectively connected with the condenser and the constant-pressure energy regulating valve; the capillary tube is connected with the evaporator, the constant-pressure energy regulating valve is connected with the evaporator, a temperature sensor is arranged at an air outlet of the evaporator, the temperature sensor is electrically connected with the PLC module, the constant-pressure energy regulating valve is electrically connected with the PLC module, and an air inlet and an air outlet are formed in the upper end of the evaporator. Thus, the temperature of the refrigerant entering the evaporator is controlled, it is guaranteed that the evaporator is not blocked by ice, and compressed air with the stable pressure dew point can be stably generated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production field of refrigeration type drying machine, concretely relates to a refrigeration type drying machine of stable pressure dew point. BACKGROUND

[0002] The refrigeration type compressed air drying machine is a kind of equipment for compressed air purification, which works based on the principle of refrigeration dehumidification, can remove moisture, oil and other impurities in compressed air, so that it reaches certain quality standard, the refrigeration type compressed air drying machine exchanges heat between compressed air and refrigerant, reduces the temperature of compressed air, so that the moisture in compressed air is cooled and recondensed, and the condensed moisture is discharged, so as to achieve the purpose of drying, pressure dew point is a parameter to describe the water vapor content in gas, especially more important in compressed air, pressure dew point refers to the temperature when water vapor in gas reaches saturation state and starts to condense into liquid water under specific pressure, and pressure dew point is an important indicator to evaluate the degree of compressed air drying, the pressure dew point of compressed air after drying in the refrigeration type compressed air drying machine in the prior art is unstable, therefore, there is an urgent need for a refrigeration type compressed air drying machine with stable pressure dew point to ensure the stability of pressure dew point. SUMMARY

[0003] The utility model discloses a refrigeration type drying machine of stable pressure dew point to solve the problems in the prior art.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A refrigeration type drying machine of stable pressure dew point, characterized by comprising compressor, evaporator, capillary, condenser, constant pressure energy regulating valve and PLC module, one end of the compressor is connected with the evaporator, and the other end is connected with the condenser and the constant pressure energy regulating valve respectively, the condenser is connected with the capillary, the capillary is connected with the evaporator, the constant pressure energy regulating valve is connected with the evaporator, a temperature sensor is arranged at the refrigerant outlet of the evaporator, the temperature sensor and the PLC module are electrically connected, the constant pressure energy regulating valve and the PLC module are electrically connected, and air inlet and air outlet are arranged at the upper end of the evaporator.

[0006] Preferably, a filter device is arranged between the air inlet and the evaporator, and first, second and third filter screens are sequentially arranged in the filter device, and at least one supporting device is arranged between two adjacent filter screens.

[0007] Preferably, the first filter screen is a wire mesh filter screen, and the second and third filter screens are activated carbon filter screens.

[0008] Preferably, the support device comprises a first base plate and a second base plate, the first base plate and the second base plate are connected by a support rod, and the first base plate and the second base plate are both provided with a plurality of through holes.

[0009] Preferably, the length of the support rod is adjustable.

[0010] Preferably, the support rod comprises an upper rod and a lower rod, the upper rod and the lower rod are connected by an adjusting bolt, the upper rod is provided with an adjusting hole, the lower rod is provided with an adjusting groove, and the adjusting bolt passes through the adjusting hole and can move in the adjusting groove.

[0011] Advantages

[0012] (1) The capillary in the utility model is used for throttling and depressurizing the refrigerant flowing out of the condenser, and the cooperation of the constant pressure energy regulating valve and the temperature sensor ensures that the temperature of the refrigerant in the evaporator remains stable, thereby improving the stability of the pressure dew point of the compressed air after drying.

[0013] (2) The filter device is arranged at the air inlet in the utility model, thereby reducing the impurities entering the evaporator, prolonging the service life of the device, and ensuring the quality of the output compressed air. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the filter device in the utility model;

[0016] Figure 3 It is a structural schematic view of the support device in the utility model;

[0017] Figure 4 It is a structural schematic view of the first base plate in the utility model;

[0018] In the drawing: 1, compressor, 2, evaporator, 3, capillary, 4, condenser, 5, constant pressure energy regulating valve, 6, PLC module, 7, temperature sensor, 8, air inlet, 9, filter device, 901, first filter screen, 902, second filter screen, 903, third filter screen, 904, mounting groove, 905, support device, 9051, first base plate, 9052, second base plate, 9053, upper rod, 9054, lower rod, 9055, adjusting hole, 9056, adjusting bolt, 9057, adjusting groove, 10, air outlet. DETAILED DESCRIPTION

[0019] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments.

[0020] In the description of the present application, it should be understood that the terms "middle", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In the present application, unless otherwise explicitly specified and limited, the terms "provision", "installation", "connection", "connection", "fixation" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be mechanically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0022] As shown in Figures 1-4 A refrigeration type dryer for stabilizing pressure dew point, comprising a compressor 1, an evaporator 2, a capillary tube 3, a condenser 4, a constant pressure energy regulating valve 5 and a PLC module 6, one end of the compressor is connected with the evaporator and the other end is connected with the condenser and the constant pressure energy regulating valve respectively, the condenser is connected with the capillary tube, the capillary tube is connected with the evaporator, the capillary tube plays a role of throttling and pressure reduction in the system, the high-pressure refrigerant from the condenser becomes low-pressure and low-temperature refrigerant after throttling and pressure reduction by the capillary tube, and then enters the evaporator for evaporation and heat absorption, the constant pressure energy regulating valve is connected with the evaporator, a temperature sensor 7 is arranged at the refrigerant outlet of the evaporator, the temperature sensor is electrically connected with the PLC module, the constant pressure energy regulating valve is electrically connected with the PLC module, an air inlet 8 and an air outlet 10 are arranged at the upper end of the evaporator respectively, Figure 1The arrow direction in the figure is the flow direction of the refrigerant, the temperature sensor detects the temperature of the evaporator outlet, when the temperature of the evaporator outlet is lower than the set value, the temperature sensor sends an electric signal to the PLC module, the PLC module sends an electric signal to the constant pressure energy regulating valve, the opening of the constant pressure energy regulating valve increases, so that the refrigerant flow that does not pass through the condenser increases, thereby increasing the temperature of the evaporator, when the temperature is higher than the set value, the temperature sensor sends an electric signal to the PLC module, the PLC module sends an electric signal to the constant pressure energy regulating valve, the opening of the constant pressure energy regulating valve decreases, thereby reducing the refrigerant flow that does not pass through the condenser, thereby reducing the temperature of the evaporator, the evaporator in the device uses a plate heat exchanger, and the cooperation of the PLC module and the constant pressure energy regulating valve in the device is used to adjust the temperature at the refrigerant outlet of the evaporator, effectively prevent ice blockage, improve the stability of the compressed air dew point, and ensure that the compressed air can be stably output, the corresponding control logic has been set in the PLC module according to the temperature signal, different temperature signals correspond to different control signals, and different control signals correspond to different valve openings, so as to change the flow of the medium in the constant pressure energy regulating valve, thereby responding to the change of the temperature.

[0023] The filter device 9 is arranged between the air inlet and the evaporator, and the first filter screen 901, the second filter screen 902 and the third filter screen 903 are sequentially arranged in the filter device. At least one supporting device 905 is arranged between two adjacent filter screens, and one supporting device is arranged between two adjacent filter screens in the device. The supporting device is used to prevent the deformation of the filter screen caused by long-time impact of the air flow, thereby affecting the filtering quality. The first filter screen is a wire filter screen, which is used to filter some solid impurities. The second filter screen and the third filter screen are activated carbon filter screens, which are used to filter volatile organic gases in the air. The filter device can filter most of the impurities in the compressed air, effectively improving the quality of the air entering the evaporator, thereby prolonging the service life of the device and improving the quality of the compressed air discharged from the evaporator, ensuring the stability of the compressed air dew point. The first filter screen, the second filter screen and the third filter screen are all filter screens for filtering impurities. Each filter screen is slidingly installed in the corresponding mounting groove 904. The filter screen can slide in the mounting groove, facilitating regular replacement of the filter screen.

[0024] The support device comprises a first base plate 9051 and a second base plate 9052, the first base plate and the second base plate are connected through a support rod, the first base plate and the second base plate are each provided with a plurality of through holes, the length of the support rod is adjustable, the support rod comprises an upper rod 9053 and a lower rod 9054, the upper rod and the lower rod are connected through an adjusting bolt 9056, the upper rod is provided with an adjusting hole 9055, the lower rod is provided with an adjusting slot 9057, the adjusting bolt passes through the adjusting hole and can move in the adjusting slot, for different deformation conditions of each filter screen, the distance between the first base plate and the second base plate needs to be adjusted, so as to meet different support requirements, when adjustment is needed, the adjusting bolt is loosened, the second base plate is moved, the adjusting slot is moved relative to the adjusting bolt, when the second base plate is moved to a suitable position, the adjusting bolt is tightened, the adjusting bolt passes through the adjusting hole and the adjusting slot in sequence to lock the upper rod and the lower rod, so as to connect the upper rod and the lower rod together, so as to support two adjacent filter screens, when air flows through the filter screen, the deformation of the filter screen is reduced.

Claims

1. A freeze-drying machine stabilizing pressure dew point, characterized by: The application relates to a refrigeration system, which comprises a compressor, an evaporator, a capillary, a condenser, a constant-pressure energy regulating valve and a PLC module, one end of the compressor is connected with the evaporator, the other end of the compressor is connected with the condenser and the constant-pressure energy regulating valve respectively, the condenser is connected with the capillary, the capillary is connected with the evaporator, the constant-pressure energy regulating valve is connected with the evaporator, a temperature sensor is arranged at the refrigerant outlet of the evaporator, the temperature sensor and the PLC module are electrically connected, the constant-pressure energy regulating valve and the PLC module are electrically connected, and the upper end of the evaporator is respectively provided with an air inlet and an air outlet.

2. A freeze-drying machine for stabilizing pressure dew point as claimed in claim 1, characterized in that: A filter device is arranged between the air inlet and the evaporator, first, second and third filter screens are sequentially arranged in the filter device, at least one supporting device is arranged between the first filter screen and the second filter screen and between the second filter screen and the third filter screen.

3. A freeze-drying machine for stabilizing pressure dew point as claimed in claim 2, characterized in that: The first filter screen is a wire filter screen, and the second and third filter screens are active carbon filter screens.

4. A freeze-drying machine for stabilizing pressure dew point as claimed in claim 2, characterized in that: The supporting device comprises first and second base plates, the first and second base plates are connected through supporting rods, and the first and second base plates are both provided with a plurality of through holes.

5. A freeze-drying machine for stabilizing pressure dew point as claimed in claim 4, characterized in that: The length of the supporting rod can be adjusted.

6. A freeze-drying machine for stabilizing pressure dew point as claimed in claim 5, characterized in that: The supporting rod comprises an upper rod and a lower rod, an adjusting bolt is connected between the upper rod and the lower rod, the upper rod is provided with an adjusting hole, the lower rod is provided with an adjusting groove, the adjusting bolt passes through the adjusting hole and can move in the adjusting groove.

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