Low-dew-point compressed air drying equipment

Abstract

The utility model provides low-dew-point compressed air drying equipment, which belongs to the technical field of compressed air drying equipment and comprises a compressor, a condenser, a first evaporator and a second evaporator. The condenser and the four-way valve are arranged in the middle of the first connecting pipe, a second connecting pipe is communicated between the second end of a coil pipe of the first evaporator and an inlet of the compressor, the second connecting pipe is sequentially provided with an electronic expansion valve and a coil pipe communicated with a second evaporator from the first evaporator, and an upper port of the first evaporator is communicated with a third connecting pipe. When the first evaporator defrosts, the second evaporator cools the compressed air, and after the first evaporator defrosts, the working modes of the two evaporators can be exchanged, namely the second evaporator defrosts, the first evaporator cools the compressed air, shutdown defrosting is not needed, and work of a production line is not affected. And if the temperature of the cooled compressed air is too low, the cooled compressed air can exchange heat with the compressed air before cooling in the heat exchanger, and the target temperature is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressed air drying equipment technical field especially a kind of low dew point compressed air drying equipment. BACKGROUND

[0002] In compressed air production, compressed air dehumidification drying is a very important link, compressed air has strict requirements on dew point (water content) when using, such as dew point over standard, light causes production line shutdown, heavy causes production process accident, the post-processing equipment for compressed air dehumidification drying is commonly called dryer, dryer is divided into two big categories and several small categories, respectively, frozen dryer (also called cold dryer) and adsorption dryer, frozen dryer is suitable for the situation that compressed air temperature is low, cold dryer principle is just to use low temperature to condense and discharge water vapor in air, consistent with the principle of household air conditioner, but after frost formation in evaporator, need to defrost due to the decline of cooling effect, but existing production line must work continuously after starting, need to defrost evaporator on rest day, need to be improved. UTILITY MODEL CONTENTS

[0003] In view of the above problems, the utility model provides a kind of low dew point compressed air drying equipment to solve one or more technical problems existing in prior art, at least provide a beneficial choice or create conditions.

[0004] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] A kind of low dew point compressed air drying equipment, including compressor, condenser, first evaporator and second evaporator, the first port of the coil of the first evaporator is communicated with the outlet of the compressor and the first connecting pipe, the condenser and four-way valve are arranged in the middle of the first connecting pipe, the second connecting pipe is sequentially arranged with electronic expansion valve, the coil of the second evaporator is communicated, the third connecting pipe is communicated with the upper port of the first evaporator, the third connecting pipe is provided with A three-way valve, the fourth connecting pipe is communicated between the side port of the first evaporator and the upper port of the second evaporator, the fourth connecting pipe is provided with B three-way valve, the B three-way valve is communicated with the pipe section after A three-way valve of the third connecting pipe, the side port of the second evaporator is communicated with the A three-way valve, the first evaporator and the second evaporator are each provided with inner container containing coil, the channel is formed between the inner container and the outer wall of evaporator, the third outlet is further provided in the channel, the fifth connecting pipe is communicated between the third outlet of the first evaporator and the second evaporator, the fourth connecting pipe is provided with C three-way valve, the C three-way valve is further communicated with the fifth connecting pipe.

[0006] Preferably, the third connecting pipe is communicated with the first outlet of heat exchanger, and the fifth connecting pipe is communicated with the second inlet of the heat exchanger.

[0007] Preferably, the first evaporator, the second evaporator and the lower part of the heat exchanger are each provided with an electronic drain.

[0008] The utility model discloses beneficial effects:

[0009] The utility model discloses through first evaporator and second evaporator, when first evaporator defrosting, second evaporator carries out the cooling of compressed air, and after first evaporator defrosting, can adjust the working mode of two evaporators, namely, second evaporator defrosting, and first evaporator carries out the cooling of compressed air, need not stop machine defrosting, and do not affect the work of production line.

[0010] Through setting up heat exchanger, if the temperature of the cooling compressed air is too low, it can be heated with the compressed air before cooling in the heat exchanger to rise to the target temperature. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is the schematic diagram of example one.

[0012] Fig. 2 It is the schematic diagram of example two.

[0013] Mark explanation: 1, compressor;2, condenser;3, first evaporator;4, second evaporator;5, first connecting pipe;6, four-way valve;7, second connecting pipe;8, electronic expansion valve;9, third connecting pipe;10, A three-way valve;11, fourth connecting pipe;12, B three-way valve;13, fifth connecting pipe;14, C three-way valve;15, sixth connecting pipe;16, heat exchanger. DETAILED DESCRIPTION

[0014] The technical scheme of the utility model will be described below in combination with the drawings and examples.

[0015] Example 1: refer to Figs. 1-2The utility model discloses a low dew point compressed air drying equipment, including compressor 1, condenser 2, first evaporimeter 3 and second evaporimeter 4, and the first port of the coil of first evaporimeter 3 is connected with first connecting pipe 5, and the middle of first connecting pipe 5 is equipped with condenser 2 and four -way valve 6, and the second end of the coil of first evaporimeter 3 is connected with second connecting pipe 7, and second connecting pipe 7 is sequentially equipped with electronic expansion valve 8, the coil of second evaporimeter 4 from first evaporimeter 3, the upper port of first evaporimeter 3 is connected with third connecting pipe 9, and third connecting pipe 9 is equipped with A three -way valve 10, and the side port of first evaporimeter 3 is connected with the upper port of second evaporimeter 4 with fourth connecting pipe 11, and fourth connecting pipe 11 is equipped with B three -way valve 12, and B three -way valve 12 is connected with the pipe section of third connecting pipe 9 after A three -way valve 10, and the side port of second evaporimeter 4 is connected with A three -way valve 10, and first evaporimeter 3 and second evaporimeter 4 are equipped with the inner container of containing the coil, and the passage is formed between the inner container and the outer wall of evaporimeter, and the passage is also equipped with third outlet, and the third outlet of first evaporimeter 3 and second evaporimeter 4 is connected with fifth connecting pipe 13, and fifth connecting pipe 13 is equipped with C three -way valve 14, and C three -way valve 14 is also connected with sixth connecting pipe 15, and compressor 1, condenser 2, first evaporimeter 3 and second evaporimeter 4 constitute freeze drying equipment.

[0016] First evaporimeter 3 defrosting, second evaporimeter 4 cooling compressed air, the process is as follows.

[0017] From compressor 1, refrigeration gas is cooled after condenser 2, and is diverted at four -way valve 6, flows to the coil of first evaporimeter 3, and defrosts the coil, after coming out from the coil of first evaporimeter 3, is cooled after electronic expansion valve 8, enters the coil of second evaporimeter 4, and the compressed air of second evaporimeter 4 is cooled, and the compressed air enters the upper end of first evaporimeter 3 from third connecting pipe 9, and defrosts the coil of first evaporimeter 3 from the lower end of inner container, and the third outlet of first evaporimeter 3 is closed, and the compressed air flows out from the side outlet of first evaporimeter 3, and flows into the upper end of second evaporimeter 4, and flows from the upper end to the lower end of the inner container of second evaporimeter 4, and exchanges heat with the low-temperature refrigeration gas in the coil of second evaporimeter 4, to achieve the purpose of cooling compressed air, and the compressed gas flows out from the lower end of inner container, and disperses to the passage, and the side port of second evaporimeter 4 is closed, and the compressed air flows out from the opened third outlet, and completes cooling, and defrosts first evaporimeter 3 during operation, and when first evaporimeter 3 defrosting is completed, it can be prepared to exchange work with second evaporimeter 4, and can defrost second evaporimeter 4, and first evaporimeter 3 is cooled.

[0018] Embodiment two: the second evaporator 4 defrosting, the first evaporator 3 cooling work flow, different from embodiment one, refrigerant is diverted through four-way valve 6, flows into the second evaporator 4, and the coil is defrosted, after from the second evaporator 4, the refrigerant is cooled after electronic expansion valve 8, enters the coil of the first evaporator 3 to the compressed air cooling, compressed air enters the second evaporator 4 upper end from the eleventh connecting pipe, flows from top to bottom through the liner, and the coil of the second evaporator 4 is defrosted, after from the second evaporator 4 side port, flow into the first evaporator 3 upper end, flow from top to bottom through the liner, compressed air and low-temperature refrigerant are exchanged, and the purpose of compressed air cooling is achieved, and compressed air flows out from the third outlet of the first evaporator 3, and the cooling is completed.

[0019] Specifically, the third connecting pipe 9 is communicated with the first outlet of the heat exchanger 16, and the sixth connecting pipe 15 is communicated with the second inlet of the heat exchanger 16; compressed air before cooling enters the heat exchanger 16 from the first inlet, flows from top to bottom, and then flows from bottom to top from the first outlet after reaching the bottom; compressed air after cooling enters the heat exchanger 16 from the second inlet, flows from bottom to top to the upper part, and then flows from bottom to top from the second outlet; when the temperature of compressed air after cooling is too low, the temperature can be increased in the heat exchanger 16 to reach the target temperature.

[0020] Specifically, the first evaporator 3, the second evaporator 4 and the lower part of the heat exchanger 16 are each provided with an electronic drain, which is beneficial to drain condensate water.

[0021] In the description of the utility model, it is understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, a specific orientation structure and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, "a plurality of" means two or more.

[0022] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A low dew point compressed air drying device, comprising a compressor (1), a condenser (2), a first evaporator (3), and a second evaporator (4), characterized in that: A first connecting pipe (5) connects the outlet of the compressor (1) and the first port of the coil of the first evaporator (3). The first connecting pipe (5) has the condenser (2) and a four-way valve (6) in the middle. A second connecting pipe (7) connects the second end of the coil of the first evaporator (3) and the inlet of the compressor (1). The second connecting pipe (7) has an electronic expansion valve (8) and a coil connecting to the second evaporator (4) in sequence from the first evaporator (3). The upper port of the first evaporator (3) is connected to a third connecting pipe (9). The third connecting pipe (9) has an A three-way valve (10). A third connecting pipe (9) connects the side port of the first evaporator (3) and the upper port of the second evaporator (4). The fourth pipe (11) is equipped with a B three-way valve (12), which connects to the pipe section of the third pipe (9) after the A three-way valve (10). The side port of the second evaporator (4) is connected to the A three-way valve (10). The first evaporator (3) and the second evaporator (4) are both equipped with inner liner for accommodating coils. A channel is formed between the inner liner and the outer wall of the evaporator. The channel is also equipped with a third outlet. A fifth pipe (13) is connected between the third outlet of the first evaporator (3) and the second evaporator (4). The fifth pipe (13) is equipped with a C three-way valve (14), which is also connected to a sixth pipe (15).

2. The low dew point compressed air drying equipment according to claim 1, characterized in that: The third pipe (9) is connected to the first outlet of the heat exchanger (16), and the sixth pipe (15) is connected to the second inlet of the heat exchanger (16).

3. The low dew point compressed air drying equipment according to claim 1, characterized in that: Electronic drainers are provided at the bottom of the first evaporator (3), the second evaporator (4) and the heat exchanger (16).

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