Water circulation system of central air conditioner

Abstract

A water circulating system of a central air conditioner is characterized in that a water collector is provided with a water replenishing pipe connected with a water replenishing source, a chilled water pipe connected with a chilled water inlet of a water segregator through a water chilling unit, a hot water pipe connected with a hot water inlet of the water segregator through a hot water unit, a chilled water circulating pump arranged on the chilled water pipe, and a hot water circulating pump arranged on the hot water pipe; the water supplementing source is located above the water collector and comprises a softened water tank, an expansion water tank and a water supplementing pump, the softened water tank is located above the expansion water tank and connected with the softened water source, the bottom of the softened water tank is connected with the expansion water tank through a pipeline and provided with a floating ball valve, and an inlet of the water supplementing pump is communicated with the softened water tank. An outlet of the make-up pump is connected with the make-up pipe through a pipeline, and a liquid level meter is arranged in the expansion water tank and electrically connected with the make-up pump. The quick water replenishing device is simple and reliable in structure and can meet the requirement for quick water replenishing of the central air-conditioning water circulation system.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner installation field especially central air conditioning's water circulation system. BACKGROUND

[0002] The central air conditioning heating and cooling region of the hospital is wide, the use environment is complex and changeable, and the stability requirement is higher. The water as the heat transfer medium expands in volume due to heating, so that the pressure in the pipeline increases. By configuring the expansion tank, the water expansion amount of the expansion tank containing system is utilized to reduce the water pressure fluctuation caused by the expansion of the water. The water amount exceeding the liquid level is discharged to the floor drain through the overflow port. The expansion tank usually supplies water by gravity. When the water circulation system is cooled down or locally leaks, the expansion tank supplies water to the system. However, when the medium water volume changes greatly and the local leakage needs to be quickly watered, the gravity water supply mode is too slow to meet the actual demand of rapid water supply.

[0003] Therefore, it is a problem to be solved by those skilled in the art to design a water circulation system with simple and reliable structure and capable of meeting the demand of rapid water supply. SUMMARY

[0004] The utility model aims at the deficiency of prior art, provides a kind of central air conditioning's water circulation system, its structure is simple, reliable, can satisfy the demand of central air conditioning water circulation system rapid water supply.

[0005] The technical scheme of the utility model is: a kind of central air conditioning's water circulation system, including water distributor, water collector, hot water unit, cold water unit, heat dissipation unit, the water collector is connected with water supply pipe and water supply source, is connected with the water distributor's chilled water import by the chilled water passage of cold water unit, is connected with the water distributor's hot water import by the hot water pipe of hot water unit, the cooling water cavity of heat dissipation unit is connected with the cooling water passage of cold water unit by cooling water circulation pipe, chilled water circulation pump is arranged on chilled water pipe, cooling water circulation pump is arranged on cooling water circulation pipe, hot water circulation pump is arranged on hot water pipe, the water supply source is located above water collector, and the water supply source includes softening water tank, expansion tank, water supply pump, the softening water tank is located above expansion tank, and is connected with soft water source, the bottom of softening water tank is connected with expansion tank by pipeline, and is provided with float ball valve, the inlet of water supply pump is communicated with softening water tank, and the outlet of water supply pump is connected with water supply pipe by pipeline, liquid level meter is arranged in expansion tank, and the liquid level meter is electrically connected with water supply pump.

[0006] The cold water unit is formed by parallel connection of a plurality of centrifugal cold water units.

[0007] The plurality of centrifugal cold water units include constant frequency cold water units and variable frequency cold water units, and the cold water unit is formed by parallel connection.

[0008] The closing height of the floating ball of the floating ball valve is adapted to the height of the overflow port of the expansion tank.

[0009] The upstream of the water replenishing pump is provided with a filter, and the downstream is provided with a check valve.

[0010] The height of the liquid level meter is lower than the height of the overflow port of the expansion tank.

[0011] The above technical scheme has the following beneficial effects:

[0012] 1. A water circulation system of a central air conditioner comprises a water distributor, a water collector, a hot water unit, a cold water unit and a heat dissipation unit. The water distributor is used to send cooled chilled water or heated hot water to heat exchangers of each room to realize cooling and heating. The water collector is used to collect chilled water or hot water returned from the heat exchangers of each room, and send the chilled water to the cold water unit or the hot water unit to be cooled or heated and then be circulated. The heat dissipation unit is used to take away the heat of the chilled water after being heated to maintain the normal operation of the cold water unit. The water collector is connected with a water supplement source through a water supplement pipe, connected with the water distributor through a chilled water pipe and a chilled water passage of the cold water unit, and connected with the water distributor through a hot water pipe and a hot water passage of the hot water unit to respectively supplement water and overflow drainage, send the chilled water after being heated to the water distributor through the cold water unit after being cooled, and send the hot water after being cooled to the water distributor through the hot water unit after being heated. The cooling water cavity of the heat dissipation unit is connected with the cooling water passage of the cold water unit through a cooling water circulation pipe, and the cooling water circulates between the heat dissipation unit and the cold water unit, and finally takes away the heat of the chilled water after being heated flowing through the cold water unit through the cooling medium of the heat dissipation unit. A chilled water circulation pump is arranged on the chilled water pipe, a cooling water circulation pump is arranged on the cooling water circulation pipe, and a hot water circulation pump is arranged on the hot water pipe to realize water circulation. The water supplement source is located above the water collector, and comprises a softened water tank, an expansion tank and a water supplement pump. The softened water tank is located above the expansion tank and connected with a soft water source. The treated soft water enters the softened water tank for storage. The expansion tank is used to supplement water to the water collector by gravity to realize water supplement of the water circulation system, and is also used to receive medium water overflowing from the water circulation system due to volume expansion. The water supplement pump is used to quickly supplement water to the water circulation system. The bottom of the softened water tank is connected with the expansion tank through a pipeline and provided with a float valve. When the expansion tank supplements water to the water circulation system, the liquid level of the softened water in the expansion tank decreases, the float valve opens, and the stored softened water in the softened water tank is supplemented to the expansion tank. When the water in the water circulation system expands and returns to the expansion tank, the liquid level of the softened water in the expansion tank rises, and the float valve closes to avoid waste of fresh softened water. The inlet of the water supplement pump is communicated with the softened water tank, the outlet of the water supplement pump is connected with the water supplement pipe through a pipeline, and a liquid level meter is arranged in the expansion tank and electrically connected with the water supplement pump. When the liquid level of the softened water in the expansion tank decreases too fast and exceeds the water supplement speed of the softened water tank to the expansion tank by gravity, and the liquid level is detected to be lower than a set value by the liquid level meter, the liquid level meter sends a signal to control the water supplement pump to start and mechanically supplement water from the softened water tank to the expansion tank, which cooperates with the gravity water supplement to effectively supplement the liquid level of the expansion tank and meet the purpose of quickly supplementing water to the water collector.

[0013] 2. The centrifugal water chiller includes constant frequency water chiller and variable frequency water chiller, and the water chiller units are formed by parallel connection, the water chiller units can control the refrigeration power of the variable frequency water chiller according to the refrigeration requirement on the basis of meeting the rated refrigeration, and the energy-saving purpose is achieved.

[0014] 3. The float ball closing height of the float ball valve is adapted to the height of the overflow port of the expansion water tank, when the softened water level in the expansion water tank reaches the overflow height, the float ball valve is closed, the softened water tank is prevented from continuously supplying water to the expansion water tank, and the softened water level in the expansion water tank is kept high to meet the actual requirement.

[0015] The further description is made in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a connection diagram of the utility model;

[0017] Figure 2 The figure is a connection diagram of the utility model; Figure 1 The figure is an enlarged view of M in the utility model.

[0018] In the drawings, 1 is a water distributor, 2 is a water collector, 3 is a hot water unit, 4 is a cold water unit, 5 is a heat dissipation unit, 6 is a water supply pipe, 7 is a chilled water pipe, 8 is a hot water pipe, 9 is a cooling water circulation pipe, 10 is a chilled water circulation pump, 11 is a cooling water circulation pump, 12 is a hot water circulation pump, 13 is a softened water tank, 14 is an expansion water tank, 15 is a water supply pump, 16 is a float ball valve, 17 is a liquid level meter, 18 is a filter, and 19 is a check valve. DETAILED DESCRIPTION

[0019] Referring to Figure 1 and Figure 2The application discloses a specific embodiment of a water circulation system of a central air conditioner. The water circulation system of the central air conditioner comprises a water distributor 1, a water collector 2, a hot water unit 3, a cold water unit 4 and a heat dissipation unit 5. In the embodiment, the hot water unit adopts two parallelly-connected vacuum hot water units (1050Kw) and utilizes boiler steam as a heat source; the cold water unit adopts two parallelly-connected centrifugal cold water units (1000RT) and a variable-frequency screw (400RT); and the heat dissipation unit adopts conventional multiple heat dissipators which are connected in parallel and arranged on a roof and utilize tap water as cooling water. The water collector 2 is connected with a water supplement pipe 6 and a water supplement source, is connected with a chilled water pipe 7 and a chilled water inlet of the water distributor through a chilled water channel of the cold water unit, and is connected with a hot water pipe 8 and a hot water inlet of the water distributor through a hot water channel of the hot water unit. A cooling water cavity of the heat dissipation unit 5 is connected with a cooling water channel of the cold water unit through a cooling water circulation pipe 9, the chilled water pipe 7 is provided with a chilled water circulation pump 10, in the embodiment, the number of the chilled water circulation pumps is five and the chilled water circulation pumps are connected in parallel. The cooling water circulation pipe 9 is provided with a cooling water circulation pump 11, in the embodiment, the number of the cooling water circulation pumps is five and the cooling water circulation pumps are connected in parallel. The hot water pipe 8 is provided with a hot water circulation pump 12, in the embodiment, the number of the hot water circulation pumps is three and the hot water circulation pumps are connected in parallel. The water supplement source is located above the water collector 2 and comprises a softened water tank 13, an expansion tank 14 and a water supplement pump 15. The softened water tank 13 is located above the expansion tank 14 and is connected with a soft water source. Generally, the soft water source is a softened water device and tap water is used as a water source. The bottom of the softened water tank 13 is connected with the expansion tank 14 through a pipeline and is provided with a float ball valve 16, the float ball of the float ball valve 16 is closed at a height which is adapted to the height of an overflow port of the expansion tank. The inlet of the water supplement pump 15 is communicated with the softened water tank 13, the outlet of the water supplement pump is connected with the water supplement pipe 6 through a pipeline, in the embodiment, the number of the water supplement pumps is two and the water supplement pumps are connected in parallel and serve as backups. Each water supplement pump 15 is provided with a filter 18 at an upstream and is provided with a check valve 19 at a downstream. The expansion tank 14 is provided with a liquid level meter 17 which is electrically connected with the water supplement pump 15, and specifically, the height of the liquid level meter 17 is lower than the height of the overflow port of the expansion tank.

[0020] The working principle of the utility model is: when refrigeration is needed, open the refrigerated water circulating pump, the cooling water circulating pump, the water chilling unit, make water circulate between the water collector, the indoor heat exchanger, the water distributor. When heating is needed, open the hot water circulating pump, make water circulate between the water collector, the indoor heat exchanger, the water distributor. When the water volume in the water circulating system expands, the excess water returns to the expansion tank through the water distribution pipe and overflows through the overflow port, the softened water level in the expansion tank rises, the float ball valve closes, avoiding the waste of fresh softened water. When the water volume in the water circulating system shrinks or leaks, the expansion tank supplies water to the water circulating system, the softened water level in the expansion tank drops, the float ball valve opens, the stored softened water in the softened water tank is supplemented to the expansion tank, when the softened water level in the expansion tank drops too fast, exceeds the water supply speed of the softened water tank to the expansion tank by gravity, and is detected by the liquid level meter to be lower than the set value, the liquid level meter sends a signal to control the water supply pump to start, the water supply pump mechanically supplies water from the softened water tank to the expansion tank, cooperating with the gravity water supply, can effectively supplement the liquid level height of the expansion tank, meet the purpose of quickly supplying water to the water collector.

Claims

1. A water circulation system of a central air conditioner, comprising a water distributor (1), a water collector (2), a hot water unit (3), a cold water unit (4), and a heat dissipation unit (5), the water collector (2) is connected with a water supplement source through a water supplement pipe (6), is connected with the water distributor through a chilled water pipe (7) and a chilled water passage of the cold water unit, and is connected with the water distributor through a hot water pipe (8) and a hot water passage of the hot water unit, a cooling water cavity of the heat dissipation unit (5) is connected with a cooling water passage of the cold water unit through a cooling water circulation pipe (9), the chilled water pipe (7) is provided with a chilled water circulation pump (10), the cooling water circulation pipe (9) is provided with a cooling water circulation pump (11), and the hot water pipe (8) is provided with a hot water circulation pump (12), characterized in that: The water source is located above the water collector (2). The water source includes a softened water tank (13), an expansion tank (14), and a water pump (15). The softened water tank (13) is located above the expansion tank (14) and is connected to the softened water source. The bottom of the softened water tank (13) is connected to the expansion tank (14) through a pipe and is equipped with a float valve (16). The inlet of the water pump (15) is connected to the softened water tank (13), and the outlet of the water pump is connected to the water supply pipe (6) through a pipeline. A level gauge (17) is installed in the expansion tank (14) and is electrically connected to the water pump (15). ​ 2. The water circulation system of a central air conditioner according to claim 1, wherein: The chiller unit (4) is formed by connecting several centrifugal chillers in parallel.

3. The water circulation system of a central air conditioner according to claim 2, wherein: Several centrifugal chillers include fixed-frequency chillers and variable-frequency chillers, which are connected in parallel to form chiller units.

4. The water circulation system of the central air conditioning system according to claim 1, characterized in that: The float closing height of the float valve (16) is adapted to the height of the overflow port of the expansion tank.

5. The water circulation system of the central air conditioning system according to claim 1, characterized in that: The water supply pump (15) is equipped with a filter (18) upstream and a check valve (19) downstream.

6. The water circulation system of the central air conditioning system according to claim 1, characterized in that: The height of the level gauge (17) is lower than the height of the overflow port of the expansion tank.

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