Constant temperature system at tail end of central air conditioner

Abstract

The utility model discloses a central air-conditioning terminal constant temperature system which comprises a cold source mechanism and a bypass pipe, the cold source mechanism comprises an air-conditioning host, a chilled water pump, a chilled water supply pipe and a chilled water return pipe, and the chilled water supply pipe and the chilled water return pipe are respectively communicated with the water supply end and the water return end of the air-conditioning host. The chilled water pump is arranged on the chilled water return pipe, the two ends of the bypass pipe are communicated with the chilled water supply pipe on one side of the air conditioner host and the chilled water return pipe on one side of the chilled water pump respectively, the chilled water supply pipe on one side of the air conditioner host is provided with a first electric valve, and the bypass pipe is provided with a second electric valve. According to the central air-conditioning terminal constant temperature system provided by the utility model, by improving the pipeline design, the water supply temperature of chilled water conveyed to the terminal is always kept within a set temperature range, so that the large fluctuation change of the temperature in a cold supply environment is avoided, and the constant temperature effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of central air-conditioning, in particular to a central air-conditioning terminal constant temperature system. Background Art

[0002] Water-cooled air conditioners mainly use water circulation as a medium for heat exchange. Water is circulated through a water pump, so that the hot return water after the terminal exchange flows back to the air conditioner host for cooling, and then flows into the terminal water supply pipe through a pipe, thereby achieving the purpose of water circulation and chilled water cooling.

[0003] In order to ensure the effectiveness of the terminal air conditioning, the chilled water delivered to the terminal must meet the set temperature as much as possible before it can enter the terminal usage environment to ensure the temperature stability of the terminal. However, when the terminal cooling demand increases or decreases, it is necessary to increase or decrease the start or stop operation of the air-conditioning host. At this time, when one of the newly added air-conditioning hosts is started or stopped, the chilled water in the corresponding pipeline cannot be fully or continuously cooled, and the chilled water temperature of this air-conditioning host will be relatively high. When this chilled water is mixed with the chilled water of the normally operating air-conditioning host, the chilled water temperature at the terminal will rise, resulting in instability of the terminal cooling temperature, affecting the cooling effect, and failing to achieve the purpose of constant temperature, causing temperature fluctuations. Utility Model Content

[0004] The utility model aims to provide a central air-conditioning terminal constant temperature system, which can keep the temperature of the chilled water delivered to the terminal within the set temperature range by improving the pipeline design, thereby avoiding large temperature fluctuations in the cooling environment and ensuring the constant temperature effect.

[0005] The technical solution adopted by a central air-conditioning terminal constant temperature system disclosed in the utility model is:

[0006] A central air-conditioning terminal constant temperature system comprises a cold source mechanism and a bypass pipe, wherein the cold source mechanism comprises an air-conditioning mainframe, a chilled water pump, a chilled water supply pipe and a chilled water return pipe, wherein the chilled water supply pipe and the chilled water return pipe are respectively connected to the water supply end and the water return end of the air-conditioning mainframe, and the chilled water pump is arranged on the chilled water return pipe, and the two ends of the bypass pipe are respectively connected to the chilled water supply pipe on one side of the air-conditioning mainframe and the chilled water return pipe on one side of the chilled water pump, a first electric valve is arranged on the chilled water supply pipe on one side of the air-conditioning mainframe, and a second electric valve is arranged on the bypass pipe.

[0007] As a preferred solution, there are several cold source mechanisms, and the several cold source mechanisms are connected in parallel with the main return pipe and the main supply pipe at the end.

[0008] As a preferred solution, a temperature sensor is provided on the refrigerated water supply pipe, and the temperature sensor is arranged on a side of the first electric valve close to the air conditioner host.

[0009] As a preferred solution, the chilled water pump is arranged between the air conditioner main unit and the bypass pipe.

[0010] The utility model discloses a terminal constant temperature system for a central air conditioner, which has the following beneficial effects: when the air conditioner main unit of the cold source mechanism is in normal operation, the return water of the terminal is pumped into the air conditioner main unit by the refrigerated water pump, and then cooled by the air conditioner main unit, and then sent to the terminal for water supply through the refrigerated water supply pipe, at this time, the first electric valve is in an open state, and the second electric valve is in a closed state; when the air conditioner main unit is just starting up or gradually shutting down, the refrigeration capacity of the air conditioner main unit is very low or even has no refrigeration capacity, so that the temperature of the refrigerated water flowing to the refrigerated water supply pipe cannot meet the use requirements due to no refrigeration, therefore, by closing the first electric valve, opening the second electric valve, starting the bypass pipe, the refrigerated water flowing out of the refrigerated water supply pipe of the air conditioner main unit passes through the bypass pipe, re-enters the refrigerated water return pipe, performs secondary cooling, until it reaches the set temperature, and then flows to the terminal for use, avoiding the situation that when multiple air conditioners are in different working states, the refrigerated water outlet temperature of each air conditioner main unit is different, and the mixed refrigerated water is sent to the terminal, resulting in the constant temperature environment of the terminal changing, thereby ensuring the constant temperature effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a central air-conditioning terminal constant temperature system. DETAILED DESCRIPTION

[0012] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0013] Please refer to Figure 1 A central air-conditioning terminal constant temperature system includes a cold source mechanism and a bypass pipe 36. The cold source mechanism includes an air-conditioning main unit 31, a chilled water pump 32, a chilled water supply pipe 34 and a chilled water return pipe 33. The chilled water supply pipe 34 and the chilled water return pipe 33 are respectively connected to the water supply end and the water return end of the air-conditioning main unit 31, and the chilled water pump 32 is arranged on the chilled water return pipe 33. The two ends of the bypass pipe 36 are respectively connected to the chilled water supply pipe 34 on one side of the air-conditioning main unit 31 and the chilled water return pipe 33 on one side of the chilled water pump 33. A first electric valve 35 is provided on the chilled water supply pipe 34, and a second electric valve 37 is provided on the bypass pipe 36.

[0014] In actual use, there are several cold source mechanisms, and the refrigerated water supply pipes 34 and refrigerated water return pipes 33 of the several cold source mechanisms are connected in parallel with the main water supply pipe 20 and the main water return pipe 10 at the end.

[0015] When the air conditioner main unit 31 of the cold source mechanism is started, the chilled water return water at the end is pumped into the chilled water return pipe 33 through the chilled water pump 32, and then cooled by the air conditioner main unit 31, and flows from the chilled water supply pipe 34 to the end for water supply. At this time, the first electric valve 35 is in an open state, and the second electric valve 37 is in a closed state; when the air conditioner main unit 31 is just started or gradually closed, the refrigeration efficiency of the air conditioner main unit 31 will decrease, resulting in the temperature of the chilled water flowing out of the chilled water supply pipe 34 cannot meet the demand, therefore, by closing the first electric valve 35, opening the second electric valve 37, and starting the bypass pipe 36, the chilled water flowing out of the chilled water supply pipe 34 of the air conditioner main unit 31 passes through the bypass pipe 36 and re-enters the chilled water return pipe 33, and is cooled twice to meet the set temperature and flow to the end, thereby avoiding the situation that when multiple air conditioners are in different working states, the chilled water outlet temperature of each air conditioner main unit 31 is different, and the mixed chilled water is sent to the end, resulting in the constant temperature environment of the end changing, thereby ensuring the constant temperature effect.

[0016] A temperature sensor 38 is provided on the chilled water supply pipe 34, and the temperature sensor 38 is arranged on the side of the first electric valve 35 close to the air-conditioning host 31, so as to better detect the chilled water temperature of the chilled water outlet of the air-conditioning host 31 on the chilled water supply pipe 34, thereby controlling the operation of the first electric valve 35 and the second electric valve 37.

[0017] The chilled water pump 32 is disposed between the air conditioner main unit 31 and the bypass pipe 36 , so that when the chilled water pump 32 is started, it can also drive the chilled water in the bypass pipe 36 to flow quickly, so that the chilled water enters the chilled water return pipe 33 .

[0018] In this embodiment, there are two cold source mechanisms. The air-conditioning main unit 31 of the first cold source mechanism is A1, the chilled water pump 32 is B1, the first electric valve 35 is V1, the second electric valve 37 is V2, and the temperature sensor 38 is T1; the air-conditioning main unit 31 of the second cold source mechanism is A2, the chilled water pump 32 is B2, the first electric valve 35 is V3, the second electric valve 37 is V4, and the temperature sensor 38 is T2.

[0019] Assume that the A1 air conditioner is running, and due to the increase in terminal demand, the A2 air conditioner needs to be added. At this time, the V3 valve is closed, the V4 valve is opened, the B2 chilled water pump is started, and the A2 air conditioner is started. At this time, the chilled water of the A2 air conditioner cannot reach the set temperature immediately because the refrigeration power of the A2 air conditioner is rising. Therefore, the chilled water temperature is much higher than that of the A1 air conditioner that has been working. By closing the valve V3, high-temperature water can be prevented from entering the terminal. At the same time, the V4 valve is opened, so that the chilled water outlet of the A2 air conditioner flows back to the chilled water pump B2 through the V4 valve, and then further cooled by the A2 air conditioner.

[0020] When the cooling power of the A2 air conditioner host gradually increases and the chilled water temperature slowly decreases, the V3 valve gradually opens and the V4 valve gradually closes, until the V3 valve is fully opened and the V4 valve is fully closed, thus achieving the purpose of constant temperature water supply.

[0021] How shutdown works:

[0022] When the terminal demand decreases, it is necessary to shut down the A1 air conditioner. The A1 air conditioner can be shut down first. During the load reduction and shutdown process of the A1 air conditioner, valve V1 is gradually closed and valve V2 is gradually opened, so that part of the chilled water outlet of the A1 air conditioner flows back to the chilled water pump B1 through valve V2, and then enters the A1 air conditioner again, reducing the amount of chilled water that is not fully cooled entering the terminal.

[0023] When the A1 air conditioner is shut down and not cooling, valve V1 is completely closed and valve V2 is completely opened, so that the chilled water of the A1 air conditioner flows back to the chilled water pump B1 through valve V2 and then enters the A1 air conditioner again, preventing high-temperature chilled water from entering the terminal.

[0024] Since the pump cannot be stopped immediately after the air-conditioning host 31 is shut down, this patent can effectively solve the problem that during the delayed shutdown time of the chilled water pump 32, uncooled or insufficiently cooled chilled water enters the terminal, causing the terminal water supply temperature to rise and affect the constant temperature environment of the terminal, thereby ensuring the constant water temperature at the terminal.

[0025] The utility model provides a terminal constant temperature system for a central air-conditioning. When an air-conditioning main unit of a cold source mechanism is in normal operation, the return water of the refrigerated water at the terminal is pumped into the air-conditioning main unit through a refrigerated water pump, and then cooled by the air-conditioning main unit, and sent to the terminal through a refrigerated water supply pipe for water supply. At this time, the first electric valve is in an open state, and the second electric valve is in a closed state. When the air-conditioning main unit is just starting up or gradually shutting down, the refrigeration capacity of the air-conditioning main unit is very low or even has no refrigeration capacity, thereby causing the temperature of the refrigerated water flowing to the refrigerated water supply pipe to fail to meet the use requirements due to lack of refrigeration. Therefore, by closing the first electric valve, opening the second electric valve, and starting the bypass pipe, the refrigerated water flowing out of the refrigerated water supply pipe of the air-conditioning main unit passes through the bypass pipe and re-enters the refrigerated water return pipe for secondary cooling until it reaches the set temperature, and then flows to the terminal for use, thereby avoiding the situation that when multiple air-conditioning main units are in different working states, the refrigerated water outlet temperature of each air-conditioning main unit is different, and the mixed refrigerated water is sent to the terminal, resulting in a change in the constant temperature environment of the terminal, thereby ensuring the constant temperature effect.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A central air conditioning terminal constant temperature system, characterized in that: It includes a cold source mechanism and a bypass pipe, the cold source mechanism includes an air-conditioning main unit, a chilled water pump, a chilled water supply pipe and a chilled water return pipe, the chilled water supply pipe and the chilled water return pipe are respectively connected with the water supply end and the water return end of the air-conditioning main unit, and the chilled water pump is arranged on the chilled water return pipe, the two ends of the bypass pipe are respectively connected with the chilled water supply pipe on one side of the air-conditioning main unit and the chilled water return pipe on one side of the chilled water pump, a first electric valve is arranged on the chilled water supply pipe on one side of the air-conditioning main unit, and a second electric valve is arranged on the bypass pipe.

2. A central air conditioning terminal constant temperature system as claimed in claim 1, characterized in that: The number of the cold source mechanisms is several, and the several cold source mechanisms are connected in parallel with the main return water pipe and the main water supply pipe at the end.

3. A central air conditioning terminal constant temperature system as claimed in claim 1, characterized in that: The refrigerated water supply pipe is provided with a temperature sensor, and the temperature sensor is arranged on the side of the first electric valve close to the air conditioner host.

4. A central air conditioning terminal constant temperature system as claimed in claim 1, characterized in that: The refrigerated water pump is arranged between the air conditioner host and the bypass pipe.

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