Constant-temperature refrigerating and heating system

Abstract

The utility model discloses a constant-temperature refrigerating and heating system and belongs to the technical field of refrigeration house unit equipment. Comprising a refrigeration house indoor unit, an auxiliary heat exchange coil pipe is arranged in the refrigeration house indoor unit, a liquid supply pipe is connected to the input end of the refrigeration house indoor unit, an expansion valve is arranged at the end, close to the refrigeration house indoor unit, of the liquid supply pipe, and an electromagnetic valve is arranged at the end, away from the refrigeration house indoor unit, of the liquid supply pipe; the liquid return pipe of the auxiliary heat exchange coil pipe is connected with the liquid supply pipe of the indoor unit of the refrigeration house in series, the second one-way valve is arranged at the position of the liquid return pipe and the auxiliary heat exchange coil pipe, and liquid in the liquid supply pipe is prevented from entering the auxiliary heat exchange coil pipe, so that double-pipeline connection is formed in the liquid supply pipe of the indoor unit of the refrigeration house; and compared with single-refrigeration and single-liquid-pipe system equipment, operation is more stable, and the requirement for energy efficiency of the existing market is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold storage unit equipment, and in particular relates to a constant temperature refrigeration and heating system. Background Art

[0002] Today's cold storage is mainly used for the freezing and refrigeration of food, medicine, machinery, and electronic products. It uses artificial refrigeration to keep a certain low temperature indoors. With the development of the economy, more and more cold storages are being built, and the defrosting technology of cold storage is constantly being improved, and the heat exchange efficiency is being improved. The quality of defrosting technology and refrigeration technology directly affects the refrigeration capacity of the equipment, food quality, etc.

[0003] For example, a heating and cooling constant temperature cold storage system with Chinese patent application number CN202322301340.5 "comprises an outdoor unit, a four-way reversing valve, a compressor, a liquid reservoir, a first filter, an expansion valve and a cold storage indoor unit; the utility model adopts a Copeland digital compressor through the compressor, a two-way liquid reservoir through the liquid reservoir, a two-way refrigeration valve body, and is controlled by each solenoid valve and a four-way reversing valve." The liquid circulation efficiency between the cold storage indoor unit and the auxiliary heat exchange coil is not enough, so the double liquid pipe system circulation heating and cooling system is improved to increase the stability of the overall pipeline operation. Utility Model Content

[0004] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a constant temperature cooling and heating system.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions: a constant temperature cooling and heating system, comprising a cold storage indoor unit, an auxiliary heat exchange coil is provided in the cold storage indoor unit, a liquid supply pipe is connected to the input end of the cold storage indoor unit, an expansion valve is provided on the end of the liquid supply pipe close to the cold storage indoor unit, a solenoid valve is provided on the end of the liquid supply pipe away from the cold storage indoor unit, a first one-way valve is provided on the liquid supply pipe between the expansion valve and the solenoid valve, a filter is connected to the pipe at the other end of the solenoid valve, a two-way liquid reservoir is connected to the other end of the filter, an air return pipe is connected to the output end of the cold storage indoor unit, and a connection end of the return pipe and the cold storage indoor unit is provided. A branch pipe is formed in the group and connected to the auxiliary heat exchange coil, and one end of the return air pipe forms two branch pipes, one branch pipe is connected to the cold storage indoor unit, and the other branch pipe is connected to the auxiliary heat exchange coil. The other end of the return air pipe is connected to a four-way reversing valve, and a return liquid pipe is provided on the output end of the auxiliary heat exchange coil. A second one-way valve is provided on the end of the return liquid pipe inserted into the auxiliary heat exchange coil. The middle section of the return liquid pipe and a section of the liquid supply pipe entering the cold storage indoor unit are connected in series, and the output end of the return liquid pipe at the rear end is inserted into the liquid supply pipe, and the connection between the return liquid pipe and the liquid supply pipe is located on the pipe between the two-way liquid reservoir and the filter, and a third one-way valve is provided on the pipe at one end of the return liquid pipe inserted into the liquid supply pipe.

[0006] Preferably, a temperature-sensing package is provided on one end of the expansion valve, and the temperature-sensing package is provided on the surface extending to the return air pipe.

[0007] Preferably, a sight glass is provided on the pipeline between the solenoid valve and the filter.

[0008] The beneficial effects of the present invention are as follows: by connecting the return liquid pipe of the auxiliary heat exchange coil and the liquid supply pipe of the cold storage indoor unit in series, and arranging a second one-way valve at the return liquid pipe and the auxiliary heat exchange coil, the liquid in the liquid supply pipe is prevented from entering the auxiliary heat exchange coil, thereby forming a double-pipe connection in the liquid supply pipe of the cold storage indoor unit, which speeds up the liquid supply efficiency. Compared with single refrigeration and single liquid pipe system equipment, the operation is more stable, and it is suitable for the existing market requirements for energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of an overall connection structure of the utility model.

[0010] In the figure: 1. Cold storage indoor unit; 101. Auxiliary heat exchange coil; 2. Second one-way valve; 3. Expansion valve; 31. Temperature sensing package; 4. First one-way valve; 5. Third one-way valve; 6. Solenoid valve; 7. Sight glass; 8. Filter; 9. Two-way liquid reservoir; 10. Four-way reversing valve; 11. Liquid return pipe; 12. Air return pipe; 13. Liquid supply pipe. DETAILED DESCRIPTION

[0011] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0012] Example: A constant temperature cooling and heating system, such as Figure 1 As shown, it includes a cold storage indoor unit 1, an auxiliary heat exchange coil 101 is provided in the cold storage indoor unit 1, a liquid supply pipe 13 is connected to the input end of the cold storage indoor unit 1, an expansion valve 3 is provided on the end of the liquid supply pipe 13 close to the cold storage indoor unit 1, a solenoid valve 6 is provided on the end of the liquid supply pipe 13 away from the cold storage indoor unit 1, a first one-way valve 4 is provided on the liquid supply pipe 13 between the expansion valve 3 and the solenoid valve 6, a filter 8 is connected to the pipe at the other end of the solenoid valve 6, and a pipe between the solenoid valve 6 and the filter 8 is provided. A sight glass 7 is provided on the channel, the other end of the filter 8 is connected to a two-way liquid reservoir 9, the output end of the cold storage indoor unit 1 is connected to the return air pipe 12, one end of the expansion valve 3 is provided with a temperature sensing package 31, the surface of the temperature sensing package 31 extending to the return air pipe 12 is provided, and a group of branch pipes connected to the auxiliary heat exchange coil 101 are provided at the connection end of the return air pipe 12 and the cold storage indoor unit 1. One end of the return air pipe 12 forms two branch pipes, one branch pipe is interconnected with the cold storage indoor unit 1, and the other branch pipe is connected to the auxiliary heat exchange coil 101. The auxiliary heat exchange coil 101 is connected, and the other end of the return air pipe 12 is connected to the four-way reversing valve 10. A return liquid pipe 11 is provided on the output end of the auxiliary heat exchange coil 101. A second one-way valve 2 is provided on one end of the return liquid pipe 11 inserted into the auxiliary heat exchange coil 101. The middle section of the return liquid pipe 11 and the liquid supply pipe 13 entering the cold storage indoor unit 1 are connected in series. By connecting the return liquid pipe 11 of the auxiliary heat exchange coil 101 and the liquid supply pipe 13 of the cold storage indoor unit 1 in series, and connecting the return liquid pipe 11 and the auxiliary heat exchange coil 101 in series, the return liquid pipe 11 and the auxiliary heat exchange coil 101 are connected in series. A second one-way valve 2 is provided at the auxiliary heat exchange coil 101, and the liquid in the liquid supply pipe 13 is placed into the auxiliary heat exchange coil 101, thereby forming a double-pipe connection in the liquid supply pipe 13 of the cold storage indoor unit 1, which speeds up the liquid supply efficiency, and the output end of the return liquid pipe 11 at the rear end is inserted into the liquid supply pipe 13, and the connection between the return liquid pipe 11 and the liquid supply pipe 13 is located on the pipe between the two-way liquid reservoir 9 and the filter 8, and a third one-way valve 5 is provided on the pipe where the return liquid pipe 11 is inserted into one end of the liquid supply pipe 13.

[0013] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. A constant temperature cooling and heating system, comprising a cold storage indoor unit (1), characterized in that: An auxiliary heat exchange coil (101) is provided in the cold storage indoor unit (1), a liquid supply pipe (13) is connected to the input end of the cold storage indoor unit (1), an expansion valve (3) is provided on the end of the liquid supply pipe (13) close to the cold storage indoor unit (1), a solenoid valve (6) is provided on the end of the liquid supply pipe (13) away from the cold storage indoor unit (1), a first one-way valve (4) is provided on the liquid supply pipe (13) between the expansion valve (3) and the solenoid valve (6), a filter (8) is connected to the pipe at the other end of the solenoid valve (6), a two-way liquid reservoir (9) is connected to the other end of the filter (8), an air return pipe (12) is connected to the output end of the cold storage indoor unit (1), a group of branch pipes connected to the auxiliary heat exchange coil (101) are provided at the connection end of the air return pipe (12) and the cold storage indoor unit (1), one end of the air return pipe (12) Two branch pipes are formed, one branch pipe is connected to the cold storage indoor unit (1), and the other branch pipe is connected to the auxiliary heat exchange coil (101). The other end of the return air pipe (12) is connected to a four-way reversing valve (10). A return liquid pipe (11) is provided on the output end of the auxiliary heat exchange coil (101). A second one-way valve (2) is provided on the end of the return liquid pipe (11) inserted into the auxiliary heat exchange coil (101). The middle section of the return liquid pipe (11) and a section of the liquid supply pipe (13) entering the cold storage indoor unit (1) are connected in series, and the output end of the return liquid pipe (11) at the rear end is inserted into the liquid supply pipe (13). The connection between the return liquid pipe (11) and the liquid supply pipe (13) is located on the pipe between the two-way liquid reservoir (9) and the filter (8). A third one-way valve (5) is provided on the pipe at the end of the return liquid pipe (11) inserted into the liquid supply pipe (13).

2. The constant temperature cooling and heating system according to claim 1, characterized in that: A temperature-sensing package (31) is provided on one end of the expansion valve (3), and the temperature-sensing package (31) is provided on a surface extending to the return air pipe (12).

3. The constant temperature cooling and heating system according to claim 1, characterized in that: A sight glass (7) is provided on the pipeline between the solenoid valve (6) and the filter (8).

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