Drying apparatus for use with a chiller

Abstract

A kind of drying equipment used by refrigerator belongs to the technical field of detection auxiliary equipment, including moisture drying mechanism, humidity detection equipment, also has detection circuit and control circuit;Moisture drying mechanism includes cylinder, water-absorbing silica gel, electromagnetic valve, electric heating sub-mechanism, shell;Water-absorbing silica gel, electromagnetic valve, electric heating sub-mechanism, shell and cylinder are installed together, humidity detection equipment, detection circuit and control circuit are installed in component box and are electrically connected.The new moisture drying mechanism can absorb the humid air in the cold air discharged by the refrigerator, the detection circuit cooperates with the humidity detection equipment to detect the humidity of the output cold air of the moisture drying mechanism in real time, when the silica gel is saturated after absorbing the humid air, that is, when the humidity exceeds the standard, it can automatically perform reverse hot air blowing to dehumidify the drying agent after the refrigerator is stopped, thereby ensuring that the humid air does not enter the shell of the equipment being tested as much as possible, and bringing convenience to the detection personnel.Based on the above, the new type has good prospects.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration auxiliary equipment technology, and in particular to a drying device used in a refrigeration machine. Background Technology

[0002] In some manufacturing sectors, to ensure that production and usage equipment meets the actual needs of low-temperature operation, the equipment is placed in refrigeration testing equipment for testing to obtain its performance at low temperatures. For example, multi-functional refrigerant analyzers, thermal imagers, sound level meters, and electronic products such as mobile phones, computers, and 5G chips need to have their functional stability and reliability verified in low-temperature environments to ensure their normal operation in cold climates or storage conditions.

[0003] A typical structure of a refrigeration testing device includes a refrigeration unit and a test chamber. The cooling pipes of the refrigeration unit and the air inlet pipe of the test chamber are connected by a pipeline. During testing, the door of the test chamber is opened, the relevant equipment to be tested is placed inside, the door is then closed, and the refrigeration unit is started to circulate cold air into the test chamber. To prevent excessive moisture in the cold air output by the refrigeration unit from adversely affecting the relevant equipment (such as excessive moisture entering the interior through gaps in the equipment casing, leading to a decrease in the insulation performance of the relevant equipment), existing refrigeration units are generally equipped with a moisture drying mechanism. The moisture drying mechanism is installed between the cooling pipe of the refrigeration unit and the air inlet pipe of the test chamber. The moisture drying mechanism absorbs the moisture in the cold air, minimizing the amount of moisture entering the casing of the relevant equipment. Although the moisture drying mechanism of the existing refrigeration unit meets the operational needs to a certain extent, it still has some technical problems due to structural and functional limitations. Specifically, it only has a single moisture absorption function. Once the desiccant inside the moisture drying mechanism is saturated with moisture, the operator cannot assess the situation without disassembling the mechanism. Therefore, if the desiccant in the moisture drying mechanism is not maintained or replaced in a timely manner after saturation, there is a possibility that moisture may enter the casing of the tested equipment. In conclusion, it is essential to provide a device that works in conjunction with a refrigeration unit, actively dehumidifying the desiccant after it becomes saturated with moisture. Utility Model Content

[0004] To overcome the shortcomings of existing refrigeration testing equipment's refrigeration drying mechanism, which has limitations in structure and function as described in the background art, this utility model provides a drying device for refrigeration equipment that can detect and output the humidity data of cold air in real time under the joint action of related mechanisms. When the humidity exceeds the standard, it can automatically reverse the flow of hot air to dehumidify the desiccant after the refrigeration unit stops. This ensures that humid air does not enter the housing of the tested equipment as much as possible and brings convenience to the testing personnel.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A drying device for use in a refrigeration unit includes a moisture drying mechanism, a humidity detection device, and a detection circuit and a control circuit. The moisture drying mechanism includes a cylinder, absorbent silica gel, solenoid valves, an electric heating sub-mechanism, and a shell. An inlet pipe and an outlet pipe are fixedly installed at both ends of the cylinder. Multiple solenoid valves are provided, with two solenoid valves and one end of the other two solenoid valves fixedly connected in parallel to one side of the inlet pipe and one side of the outlet pipe of the cylinder, respectively. The other ends of the first and third solenoid valves are fixedly connected to the cooling pipe of the refrigeration unit and the inlet pipe of the test chamber, respectively. The absorbent silica gel comprises several particles, and multiple vent holes are located at both ends of the shell, with the particles distributed on the shell. Inside, the outer shell is fixedly installed inside the cylinder. The other end of the fourth solenoid valve is fixedly connected to the exhaust pipe of the electric heating sub-mechanism. The control circuit, detection circuit, and humidity detection device are installed in the component box. There is an opening at one end of the cylinder, and the probe of the humidity monitoring device is installed in the opening of the cylinder. The first power output terminal of the control circuit is electrically connected to the power input terminal of the humidity detection device, the detection circuit, and the control circuit. The second power output terminal of the control circuit is electrically connected to the power input terminal of multiple solenoid valves and the electric heating sub-mechanism. The signal input terminal of the detection circuit is electrically connected to the signal output terminal of the humidity detection device. The signal output terminal of the detection circuit is electrically connected to the signal input terminal of the control circuit.

[0006] Furthermore, the first and third solenoid valves are normally open solenoid valves, while the second and fourth solenoid valves are normally closed solenoid valves.

[0007] Furthermore, the electric heating sub-mechanism includes a housing, a fan, and an electric heating plate. The upper end of the housing has multiple vent holes, and the lower end has an exhaust pipe. The axial fan is fixedly installed inside the upper end of the housing, and the electric heating plate is fixedly installed inside the lower end of the housing.

[0008] Furthermore, the axial fan's outer casing and blades are spaced apart from the interior of the casing, with the fan blades located at the lower end.

[0009] Furthermore, the detection circuit includes an adjustable resistor, a resistor, a transistor, and a three-terminal voltage detector connected by wires. The positive power input terminal of the three-terminal voltage detector is connected to one end of the adjustable resistor and one end of the first resistor. The other end of the first resistor is connected to the negative power input terminal of the three-terminal voltage detector and the emitter of the transistor. The power output terminal of the three-terminal voltage detector is connected to one end of the second resistor. The other end of the second resistor is connected to the base of the transistor.

[0010] Furthermore, the control circuit includes two relays and a time switch connected by wires. The positive power input terminal of the first relay is connected to the control power input terminal, and the normally closed contact terminal of the second relay is connected to the control power input terminal of the first relay. The normally open contact terminal of the first relay is connected to the positive signal input terminal of the time switch. The control power input terminal of the second relay is connected to the positive power input terminal of the time switch. The negative power input terminal of the second relay is connected to the negative power input terminal and the negative signal input terminal of the time switch W4.

[0011] Compared with the prior art, the technical effect of this utility model is: the new moisture drying mechanism can adsorb the humid air in the cold air discharged by the refrigeration unit. The detection circuit, together with the humidity detection equipment, can detect the humidity of the cold air output by the moisture drying mechanism in real time. When the silica gel is saturated with humid air, that is, when the humidity exceeds the standard, it can automatically blow hot air in reverse to dehumidify the desiccant after the refrigeration unit stops. This ensures that humid air does not enter the housing of the tested equipment as much as possible and brings convenience to the testers (no manual operation is required). Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation

[0014] Figure 1 , 2As shown, a drying device used in a refrigeration unit includes a power module W1, a moisture drying mechanism, a humidity detection device W2, and a detection circuit 1 and a control circuit 2. The moisture drying mechanism includes a cylinder 31, absorbent silica gel 32, solenoid valves DC1, DC2, DC3, and DC4, an electric heating mechanism, and a housing 33. An inlet pipe 311 and an exhaust pipe 312, communicating with the inside of the cylinder, are fixedly installed on the middle of the outer sides of the left and right ends of the cylinder 31, respectively. There are four solenoid valves DC1, DC2, DC3, and DC4. Two of the solenoid valves, DC1 and DC3, and the other two, DC2 and DC4, are fixedly connected at one end to the first and second ends of a three-way pipe, respectively. The third ends of the two three-way pipes are fixedly connected to the left side of the inlet pipe 311 and the right side of the exhaust pipe 312, respectively. A connecting pipe is installed at the other end of the first solenoid valve DC1 and the other end of the third solenoid valve DC3. A flange 313 is fixedly installed on the outer side of each of the two connecting pipes. The flange 313 is fixedly connected to the right flange of the cooling pipe of the refrigeration unit (not shown in the figure), and the right flange 313 of the cylinder body is fixedly connected to the left flange of the air inlet pipe of the test chamber (not shown in the figure). The water-absorbing silica gel 32 has several particles, and the outer shell 33 has multiple air vents 331 at the left and right ends respectively. The several particles of water-absorbing silica gel 32 are arranged inside the outer shell 33 (there are gaps between the several particles of water-absorbing silica gel 32 to ensure air inflow and outflow). The outer shell 33 is fixedly installed in the middle of the cylinder body 31 (there is a fixing ring in the middle of the cylinder body 31 with an inner diameter smaller than the outer shell, and the outer shell 33 is tightly fitted inside the outer shell at the left end of the fixing ring). The other end of the fourth solenoid valve DC4 is fixedly connected to the exhaust pipe of the electric heating sub-mechanism. The power module W1, control circuit 2, detection circuit 1, and humidity detection device W2 are installed on the circuit board inside the component box 4. There is an opening on the right end of the cylinder body 31, and the probe of the humidity monitoring device W2 is installed inside the right end of the cylinder body 31 through the opening (the opening is sealed with sealant, and the probe is located inside the cylinder body 31).

[0015] Figure 1 , 2As shown, the first solenoid valve DC1 and the third solenoid valve DC3 are normally open solenoid valves, while the second solenoid valve DC2 and the fourth solenoid valve DC4 are normally closed solenoid valves. The electric heating sub-mechanism includes a cylindrical housing 341, an axial fan M, and electric heating plates RT. The housing 341 has multiple vent holes at its upper end and an exhaust pipe 342 at its lower center. The axial fan M is vertically and fixedly installed inside the upper part of the housing 341, with its blades located at the lower end. The housing and blades of the axial fan M are spaced apart from the interior of the housing 341. The two electric heating plates RT are fixedly installed on the left and right sides of the lower end of the housing 341 (which is made of metal). The detection circuit includes an adjustable resistor RP, resistors R2 and R3, a transistor T1, and a three-terminal voltage detector W3, all connected via circuit board wiring. The positive power input terminal 2 of the three-terminal voltage detector W3 is connected to one end of the adjustable resistor RP and one end of the first resistor R2. The other end of the first resistor R2 is connected to the negative power input terminal 3 of the three-terminal voltage detector W3 and the emitter of the transistor T1. The power output terminal 1 of the three-terminal voltage detector W3 is connected to one end of the second resistor R3. The other end of the second resistor R3 is connected to the base of the transistor T1. The control circuit includes two relays K1 and K2 connected by circuit board wiring, and a time switch W4. The positive power input terminal and control power input terminal of the first relay K1 are connected to the normally closed contact terminal of the second relay K2. The normally open contact terminal of the first relay K1 is connected to the positive signal input terminal (pin 3) of the time switch W4. The control power input terminal of the second relay K2 is connected to the positive power input terminal (pin 1) of the time switch W4. The negative power input terminal (pin 2) and negative signal input terminal (pin 4) of the time switch W4 are connected. The power input terminals 1 and 2 of the power module W1, the two power input terminals of the control circuit relay K2, and the two poles of the 220V AC power supply are connected by wires. The power output terminals 3 and 4 of the power module W1, the positive power input terminal of the control circuit relay K1, and the negative power input terminal 2 of the time switch W4 are connected by wires. The normally closed contact of the first power output terminal of the control circuit relay K2, the terminal 2 of the time switch W4, the power input terminals 1 and 2 of the humidity detection device W2, and the power supply of the detection circuit are also connected by wires. The other end of the input resistor R2 is connected via a wire. The second power output terminal of the control circuit, pins 5 and 2 of the time control switch W4, and the power input terminals of the four solenoid valves DC1, DC2, DC3, and DC4, the electric heating plate RT of the electric heating sub-mechanism, and the axial flow fan M are connected via a wire. The other end of the adjustable resistor RP of the detection circuit and the signal output terminal 3 of the humidity detection device W2 are connected via a wire. The collector of the transistor T1 of the detection circuit and the negative power input terminal of the relay K1 of the control circuit are connected via a wire.

[0016] Figure 1 , 2As shown, after the 220V power supply enters the power input terminal of the power module W1, pins 3 and 4 of the power module W1 output a stable 12V DC power supply, which enters the power input terminal of the relay K2 and the 4th pin of the time-controlled switch W4. The cold air output from the refrigerator enters through the left side of the cylinder 31 (the solenoid valves DC1 and DC3 are open when de-energized, and the solenoid valves DC2 and DC4 are closed when de-energized). Then, the water-absorbing silica gel 32 of the moisture drying mechanism absorbs the humid air in the cold air. After the cold air is de-energized, it enters the test chamber through the right side of the cylinder to perform cooling tests on the relevant equipment in the test chamber. When the refrigerator is not stopped working, the 220V power supply will enter the power input terminal of the relay K2. The relay K2 is energized and its control power input terminal and normally closed contact terminal are open. In this way, the 12V power supply will not enter the power input terminal of the detection circuit and the humidity detection device W2. When the refrigeration unit stops working, the 220V power supply no longer enters the power input terminal of relay K2. Relay K2 is de-energized and no longer engages, closing its control power input terminal and normally closed contact. Thus, the 12V power supply enters the power input terminals of the detection circuit, humidity detection device W2, etc. When the humidity of the air remaining on the right side of the cylinder 31 after drying by the moisture drying mechanism is relatively low (that is, the humidity of the cold air output by the refrigeration unit was relatively low during the last test), the voltage signal output from pin 3 of the humidity detection device W2 is relatively low. This voltage signal is divided by the adjustable resistors RP and R2 and enters the voltage at pin 2 of the three-terminal voltage detector W3. Since this voltage is lower than the internal 4.75V threshold voltage of the three-terminal voltage detector W3, pin 1 of the three-terminal voltage detector W3 does not output a high level. Therefore, relay K1 will not be energized, and all solenoid valves, electric heating plate RT, and axial fan will not be energized and will not operate. When the humidity of the air remaining on the right side of the cylinder 31 after drying by the moisture drying mechanism is relatively high (that is, the humidity of the cold air output by the refrigeration unit was relatively high during the last test), the voltage signal output by pin 3 of the humidity detection device W2 is relatively high. This voltage signal is divided by the adjustable resistor RP and the resistor R2 and enters the voltage at pin 2 of the three-terminal voltage detector W3. The voltage is higher than the internal 4.75V threshold voltage of the three-terminal voltage detector W3. Pin 1 of the three-terminal voltage detector W3 outputs a high level. This high level is reduced and current limited by the resistor R3 and enters the base of the transistor T1. The transistor T1 conducts and its collector outputs a low level, which enters the negative power input terminal of the relay K1. The relay K1 is energized and its control power input terminal and normally open contact terminal are closed. In this way, pin 3 of the time control switch W4 is energized.When pin 3 of the timer switch W4 is energized, pin 5 outputs power for two minutes (time adjustable), which powers four solenoid valves DC1, DC2, DC3, and DC4, as well as the axial fan M and the electric heating plate RT. When solenoid valves DC1 and DC3 are energized, their valve cores close; when solenoid valves DC2 and DC4 are energized, their valve cores open. The electric heating plate RT heats up, and the axial fan M generates negative pressure, drawing outside air into the cylinder 31. The air carries away the heat from the electric heating plate RT and enters through the right end of the cylinder 31. The heat from the hot air acts in the opposite direction on the silica gel 32 inside the outer shell 33. The silica gel, heated and absorbing moisture, is discharged to the atmosphere through the second solenoid valve DC2. This allows the silica gel to return to a dry state, preparing it for the next use to absorb moisture from cold air. After two minutes, all solenoid valves DC1, DC2, DC3, and DC4, as well as the axial fan M and the electric heating plate RT, are de-energized and cease operation, preparing for the next use. This new design allows the silica gel particles to dry only after relay K2 is de-energized at the end of each test (to verify the functional stability and reliability of the relevant equipment in a low-temperature environment). This prevents the drying process from adversely affecting the testing of the relevant equipment. (Since the saturation of the silica gel particles with water absorption was tested in the previous test, even if the silica gel is definitely damp, it will not affect its ability to absorb humid air.)

[0017] Figure 1 , 2 As shown above, this new type of device can adsorb humid air from the cold air discharged by the refrigeration unit. When the silica gel becomes saturated with humid air, meaning the humidity exceeds the standard, it can automatically reverse the flow of hot air to dehumidify the desiccant after the refrigeration unit stops. This ensures that humid air does not enter the casing of the tested equipment as much as possible and provides convenience for the testing personnel (no manual operation is required). The power module W1 is a finished product of AC 220V to DC 12V power module; the three-terminal voltage detector W3 is model AN051A; the transistor T1 is model 9013 (NPN); the solenoid valves DC1, DC2, DC3, and DC4 have a power of 2W (operating voltage AC 220V); the relay K1 is model DC 12V; the relay K2 is model AC 220V; the axial fan M is a small axial fan with a power of 20W (with the same structure as the cooling fan inside a PC host); the electric heating plate RT has a power of 1... The product is a 00W PTC constant temperature electric heating plate (heating temperature 100℃); the time control switch W4 is a YF-79 time relay module, which has two power input terminals (pins 1 and 2), two signal input terminals (pins 3 and 4), one power output terminal (pin 5), and four setting buttons. By operating the four setting buttons, the time for pin 5 to output power after each trigger signal input at pins 3 and 4 can be set; the resistance values ​​of resistors R2 and R3 are 4.75K and 1K respectively; the resistance value of adjustable resistor RP is 47K (adjustable to 7.25K).

[0018] Those skilled in the art should understand that although this specification describes embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Therefore, the scope of protection of this application is defined by the claims.

Claims

1. A drying device used in a refrigeration unit, comprising a moisture drying mechanism and a humidity detection device, characterized in that, It also has a detection circuit and a control circuit; the moisture drying mechanism includes a cylinder, absorbent silica gel, solenoid valves, an electric heating sub-mechanism, and a shell; an air inlet pipe and an exhaust pipe are fixedly installed on both ends of the cylinder, and there are multiple solenoid valves, of which two solenoid valves and one end of the other two solenoid valves are fixedly connected in parallel to one side of the air inlet pipe and one side of the exhaust pipe of the cylinder, respectively; the other end of the first solenoid valve and the other end of the third solenoid valve are fixedly connected to the cooling air pipe of the refrigeration unit and the air inlet pipe of the test chamber, respectively; there are several granules of absorbent silica gel, and multiple vent holes are respectively on both ends of the shell, with several granules of absorbent silica gel arranged inside the shell, and the shell is fixedly installed inside the cylinder, the fourth... The other end of the solenoid valve is fixedly connected to the exhaust pipe of the electric heating sub-mechanism. The control circuit, detection circuit, and humidity detection device are installed in the component box. There is an opening at one end of the cylinder, and the probe of the humidity monitoring device is installed in the opening of the cylinder. The first power output terminal of the control circuit is electrically connected to the power input terminal of the humidity detection device, the detection circuit, and the control circuit. The second power output terminal of the control circuit is electrically connected to the power input terminal of multiple solenoid valves and the electric heating sub-mechanism. The signal input terminal of the detection circuit is electrically connected to the signal output terminal of the humidity detection device. The signal output terminal of the detection circuit is electrically connected to the signal input terminal of the control circuit.

2. The drying equipment used in a refrigeration unit according to claim 1, characterized in that, The first and third solenoid valves are normally open solenoid valves, while the second and fourth solenoid valves are normally closed solenoid valves.

3. The drying equipment used in a refrigeration unit according to claim 1, characterized in that, The electric heating sub-component includes a housing, a fan, and an electric heating plate. The upper end of the housing has multiple vent holes, and the lower end has an exhaust pipe. The axial fan is fixedly installed inside the upper end of the housing, and the electric heating plate is fixedly installed inside the lower end of the housing.

4. A drying device for use in a refrigeration unit according to claim 3, characterized in that, The distance between the outer casing and blades of the axial fan and the interior of the casing; the blades of the axial fan are located at the lower end.

5. A drying device for use in a refrigeration unit according to claim 1, characterized in that, The detection circuit includes an adjustable resistor, a resistor, a transistor, and a three-terminal voltage detector connected by wires. The positive power input terminal of the three-terminal voltage detector is connected to one end of the adjustable resistor and one end of the first resistor. The other end of the first resistor is connected to the negative power input terminal of the three-terminal voltage detector and the emitter of the transistor. The power output terminal of the three-terminal voltage detector is connected to one end of the second resistor. The other end of the second resistor is connected to the base of the transistor.

6. A drying device for use in a refrigeration unit according to claim 1, characterized in that, The control circuit includes two relays and a time switch connected by wires. The positive power input terminal of the first relay is connected to the control power input terminal, and the normally closed contact terminal of the second relay is connected to the normally open contact terminal of the first relay is connected to the positive signal input terminal of the time switch. The control power input terminal of the second relay is connected to the positive power input terminal of the time switch, and the negative power input terminal of the second relay is connected to the negative power input terminal and the negative signal input terminal of the time switch W4.

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