A series of multi-stage frequency conversion drying machine

Abstract

A multi-stage variable frequency drying machine in series includes a first heat pump system and a second heat pump system, wherein the first heat pump system includes a first compressor, a first four-way valve, a first heat exchange tube, a first liquid storage tank, a first electronic expansion valve, a first evaporator and a first gas-liquid separator, and the second heat pump system includes a second compressor, a second four-way valve, a second heat exchange tube, a second liquid storage tank, a second electronic expansion valve, a second condenser and a second gas-liquid separator. The first compressor adopts a variable frequency low-temperature compressor, so the temperature that the first heat pump system can form is lower; the first heat pump system heats the second heat exchange tube of the second heat pump system through the first heat exchange tube, and the second heat exchange tube is equivalent to the evaporator of the second heat pump system. By increasing the heat of the refrigerant in the second heat pump system and cooperating with the high-temperature compressor, the second heat pump system can form a higher temperature, and the temperature range that the drying machine can output is wider.

Description

Technical Field

[0001] The utility model relates to a heat pump system, in particular to a series-connected multi-stage variable frequency drying machine. Background Art

[0002] Currently, the temperature range of a single heat pump system is limited. It can either handle high temperatures but not low temperatures, or it can handle low temperatures but not high temperatures. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a series-connected multi-stage variable frequency drying machine, which has a wider output temperature range and can produce both high temperature and low temperature.

[0004] To solve the above technical problems, the technical solution of the utility model is: a series multi-stage variable frequency drying machine, including a first heat pump system and a second heat pump system, the first heat pump system including a first compressor, a first four-way valve, a first heat exchange tube, a first liquid storage tank, a first electronic expansion valve, a first evaporator and a first gas-liquid separator, the output end of the first compressor is connected to the D port of the first four-way valve, the C port of the first four-way valve is connected to the input end of the first heat exchange tube, the output end of the first heat exchange tube is connected to the input end of the first liquid storage tank, the output end of the first liquid storage tank is connected to the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is connected to the input end of the first evaporator, the output end of the first evaporator is connected to the E port of the first four-way valve, the S port of the first four-way valve is connected to the input end of the first gas-liquid separator, the output end of the first gas-liquid separator is connected to the input end of the first compressor, and the first compressor is a variable frequency low-temperature compressor; the second heat pump system includes a second compressor The invention relates to a compressor, a second four-way valve, a second heat exchange tube, a second liquid storage tank, a second electronic expansion valve, a second condenser and a second gas-liquid separator, wherein the output end of the second compressor is connected to the D port of the second four-way valve, the C port of the second four-way valve is connected to the input end of the second condenser, the output end of the second condenser is connected to the input end of the second liquid storage tank, the output end of the second liquid storage tank is connected to the input end of the second electronic expansion valve, the output end of the second electronic expansion valve is connected to the input end of the second heat exchange tube, the output end of the second heat exchange tube is connected to the E port of the second four-way valve, the S port of the second four-way valve is connected to the input end of the second gas-liquid separator, the output end of the second gas-liquid separator is connected to the input end of the second compressor, and the second compressor is a high-temperature compressor; the first heat exchange tube and the second heat exchange tube are combined to form a plate heat exchanger to realize heat exchange. Principle of the utility model: the first evaporator of the first heat pump system is used to form a low temperature, and the first compressor adopts a variable frequency low-temperature compressor, so the temperature that the first heat pump system can form is lower; the second condenser of the second heat pump system is used to form a high temperature, and the first heat pump system heats the second heat exchange tube of the second heat pump system through the first heat exchange tube, and the second heat exchange tube is equivalent to the evaporator of the second heat pump system. By increasing the heat of the refrigerant in the second heat pump system and cooperating with the high-temperature compressor, the second heat pump system can form a higher temperature, and the dryer can output a wider temperature range.

[0005] As an improvement, the first evaporator is a fin evaporator and is provided with a cooling fan, and the second condenser is a fin condenser and is provided with a heating fan.

[0006] Compared with the prior art, the utility model has the following beneficial effects:

[0007] The first evaporator of the first heat pump system is used to form a low temperature, and the first compressor adopts a variable frequency low-temperature compressor, so the temperature that the first heat pump system can form is lower; the second condenser of the second heat pump system is used to form a high temperature, and the first heat pump system heats the second heat exchange tube of the second heat pump system through the first heat exchange tube, and the second heat exchange tube is equivalent to the evaporator of the second heat pump system. By increasing the heat of the refrigerant in the second heat pump system and cooperating with the high-temperature compressor, the second heat pump system can form a higher temperature, and the dryer can output a wider temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the pipeline diagram of the utility model. DETAILED DESCRIPTION

[0009] The utility model will be further described below in conjunction with the accompanying drawings.

[0010] like Figure 1 As shown, a series multi-stage variable frequency drying machine includes a first heat pump system and a second heat pump system. The first heat pump system includes a first compressor, a first four-way valve, a first heat exchange tube, a first liquid storage tank, a first electronic expansion valve, a first evaporator and a first gas-liquid separator. The output end of the first compressor is connected to the D port of the first four-way valve, the C port of the first four-way valve is connected to the input end of the first heat exchange tube, the output end of the first heat exchange tube is connected to the input end of the first liquid storage tank, the output end of the first liquid storage tank is connected to the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is connected to the input end of the first evaporator, the output end of the first evaporator is connected to the E port of the first four-way valve, the S port of the first four-way valve is connected to the input end of the first gas-liquid separator, and the output end of the first gas-liquid separator is connected to the input end of the first compressor; the first compressor is a variable frequency low-temperature compressor, and the first evaporator is a fin evaporator and is provided with a refrigeration fan. The second heat pump system includes a second compressor, a second four-way valve, a second heat exchange tube, a second liquid storage tank, a second electronic expansion valve, a second condenser and a second gas-liquid separator. The output end of the second compressor is connected to the D port of the second four-way valve, the C port of the second four-way valve is connected to the input end of the second condenser, the output end of the second condenser is connected to the input end of the second liquid storage tank, the output end of the second liquid storage tank is connected to the input end of the second electronic expansion valve, the output end of the second electronic expansion valve is connected to the input end of the second heat exchange tube, the output end of the second heat exchange tube is connected to the E port of the second four-way valve, the S port of the second four-way valve is connected to the input end of the second gas-liquid separator, and the output end of the second gas-liquid separator is connected to the input end of the second compressor; the second compressor is a high-temperature compressor; the second condenser is a fin condenser and is provided with a heating fan. The first heat exchange tube and the second heat exchange tube are combined to form a plate heat exchanger to achieve heat exchange.

[0011] Principle of the utility model: the first evaporator of the first heat pump system is used to form a low temperature, and the first compressor adopts a variable frequency low-temperature compressor, so the temperature that the first heat pump system can form is lower; the second condenser of the second heat pump system is used to form a high temperature, and the first heat pump system heats the second heat exchange tube of the second heat pump system through the first heat exchange tube, and the second heat exchange tube is equivalent to the evaporator of the second heat pump system. By increasing the heat of the refrigerant in the second heat pump system and cooperating with the high-temperature compressor, the second heat pump system can form a higher temperature, and the dryer can output a wider temperature range.

Claims

1. A multi-stage variable frequency drying machine in series, comprising a first heat pump system and a second heat pump system, characterized in that: The first heat pump system comprises a first compressor, a first four-way valve, a first heat exchange tube, a first liquid storage tank, a first electronic expansion valve, a first evaporator and a first gas-liquid separator, wherein the output end of the first compressor is connected to the D port of the first four-way valve, the C port of the first four-way valve is connected to the input end of the first heat exchange tube, the output end of the first heat exchange tube is connected to the input end of the first liquid storage tank, the output end of the first liquid storage tank is connected to the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is connected to the input end of the first evaporator, the output end of the first evaporator is connected to the E port of the first four-way valve, the S port of the first four-way valve is connected to the input end of the first gas-liquid separator, the output end of the first gas-liquid separator is connected to the input end of the first compressor, and the first compressor is a variable frequency low-temperature compressor; The second heat pump system includes a second compressor, a second four-way valve, a second heat exchange tube, a second liquid storage tank, a second electronic expansion valve, a second condenser and a second gas-liquid separator, the output end of the second compressor is connected to the D port of the second four-way valve, the C port of the second four-way valve is connected to the input end of the second condenser, the output end of the second condenser is connected to the input end of the second liquid storage tank, the output end of the second liquid storage tank is connected to the input end of the second electronic expansion valve, the output end of the second electronic expansion valve is connected to the input end of the second heat exchange tube, the output end of the second heat exchange tube is connected to the E port of the second four-way valve, the S port of the second four-way valve is connected to the input end of the second gas-liquid separator, the output end of the second gas-liquid separator is connected to the input end of the second compressor, and the second compressor is a high-temperature compressor; The first heat exchange tube and the second heat exchange tube are combined to form a plate heat exchanger to achieve heat exchange.

2. A series multi-stage variable frequency drying machine according to claim 1, characterized in that: The first evaporator is a fin evaporator and is provided with a cooling fan, and the second condenser is a fin condenser and is provided with a heating fan.

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