Water level control device, cooling tower and water level control method for cooling tower

Abstract

The present invention discloses a water level control device, a cooling tower and a water level control method for a cooling tower, and belongs to the technical field of cooling towers. The present invention comprises: a water level frame, on which a guide structure and a limit structure are fixedly installed; a double water level control mechanism, which is movably arranged on the water level frame through the guide structure, and the double water level control mechanism controls the water level under the action of the limit structure. The working condition of the existing water level control device is effectively improved, and the working reliability of the cooling tower is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling towers, and in particular to a water level control device, a cooling tower and a water level control method for a cooling tower. Background Art

[0002] The water-cooled chiller uses a shell and tube evaporator to exchange heat between water and refrigerant. The refrigerant system absorbs the heat load in the water, cools the water and produces chilled water for users. The refrigerant that has absorbed the heat load then brings the heat to the shell and tube condenser through the compressor. Inside the condenser, the refrigerant exchanges heat with the circulating water again. After the water absorbs the heat, it takes the heat out of the external cooling tower through the water pipe to dissipate and cool down. Therefore, the cooling tower is an important part of the water-cooled refrigeration unit. In the cooling tower, the water is cooled and circulated through forced convection of air.

[0003] The lower part of the cooling tower is a water receiving pool, which plays the role of transfer and water storage in the open circulation of cooling water. Taking into account cooling efficiency, energy saving, and building load-bearing factors, the pool is designed with a suitable ideal working water level. The water level adjustment and control device is a float valve installed on one side of the pool. When the water level drops, the float valve opens to replenish water into the pool. When the set water level is reached, the float valve closes and stops replenishing water. The amount of water evaporated by the cooling tower during the cooling process is very large, so the cooling tower needs to be frequently and intermittently replenished during operation to maintain the dynamic balance of the water level and meet the water needs of the unit heat exchange.

[0004] However, when the unit is shut down, the water pump also stops working, and the circulating water in the tower top and high pipes will flow back to the pool, causing the water level to suddenly rise compared to the working state. If the control position of the float valve is exceeded, the float will be completely submerged in the water, the buoyancy will increase, and the torque of the connecting rod will increase, which will inevitably increase the load on the various structural components of the float valve. This change in the on-off state will always lead to a sudden change in the water level, resulting in unfavorable working conditions, which will test the reliability of the float valve over time. Therefore, how to improve the working conditions of the float valve, improve the working reliability of the cooling tower, and avoid unnecessary waste of water resources are issues that need to be considered and resolved. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art, and therefore a water level control device, a cooling tower and a water level control method for a cooling tower are proposed to effectively improve the working conditions of the existing water level control device and improve the working reliability of the cooling tower.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A water level control device, comprising:

[0008] A water level frame, on which a guide structure and a limit structure are fixedly installed;

[0009] A double water level control mechanism is movably arranged on a water level frame through a guide structure, and the double water level control mechanism controls the water level under the action of a limit structure.

[0010] Furthermore, the dual water level control mechanism comprises:

[0011] A buoy, wherein the buoy is movably arranged through the guide structure and the water level frame, and the buoy limits its own floating height under the action of the limiting structure;

[0012] A valve is fixedly mounted on a buoy and a switch structure is mounted on the valve. The switch structure automatically controls the water level under the combined action of the buoy and the limit structure.

[0013] Furthermore, the switch structure includes a rotating shaft, a connecting rod, a pressure rod and a float, the rotating shaft is fixedly connected to the valve core, one end of the connecting rod is fixedly connected to the rotating shaft, and the other end is fixedly connected to the float, one end of the pressure rod is fixedly connected to the rotating shaft, and the other end is freely set, and the freely set end of the pressure rod automatically closes the valve to control the water level under the action of the limiting structure, and the float is first floated up to close the valve due to the buoyancy during the floating process, and then floats up with the float.

[0014] Furthermore, a freely disposed end of the pressure rod is provided with an upwardly folded height control portion, and the height control portion is made of elastic material to eliminate the contact error between the limit frame and the limit plate, thereby ensuring that whether the float approaches or hits the limit frame, the pressure rod is sufficient to bear force and reliably drive the valve to close, and can also ensure that the valve shaft is not overly stressed, thereby protecting the mechanical structure of the valve and further improving the reliability of water level control.

[0015] Furthermore, the limiting structure includes a limiting frame and a limiting plate, the limiting frame is fixedly connected to the lower surface of the limiting plate, the limiting frame is used to control the height of the float, the limiting plate is horizontally fixedly connected to the top of the water level frame, and the limiting plate is used to control the rising height of the limit rod in the vertical direction.

[0016] Furthermore, the guide structure includes two vertically arranged guide columns, both of which are fixedly connected to the bottom of the water level frame. When the water level changes, the two guide columns are used to control the buoy to always maintain vertical movement.

[0017] A cooling tower comprises the water level control device and cooling system described in any one of the above items, wherein the water level control device is fixedly installed inside the cooling tower, and the cooling system comprises a fan and fillers located on both sides of the fan, wherein the bottoms of the fillers on both sides are inclined toward the side close to the fan, and the fillers and the fan are used in combination to increase the heat dissipation of water entering the cooling tower, extend the cooling water residence time, increase the heat exchange area, and increase the heat exchange amount.

[0018] A water level control method for a cooling tower comprises the following steps:

[0019] When the water level in the cooling tower is lower than the set value: the float falls to the bottom of the water level rack, and as the water level drops, the float controls the shaft to rotate in real time through the connecting rod to open the valve, and the outside water passes through the pipe and the valve into the cooling tower for water replenishment; the float will float up as the water level rises, and the float remains at the current position. When the water level reaches the set value, the float controls the shaft to rotate in real time through the connecting rod to close the valve, stop water replenishment, and maintain the dynamic balance of the water level.

[0020] A water level control method for a cooling tower comprises the following steps:

[0021] When the unit is shut down: the water in the pipe at the top of the cooling tower will flow back into the cooling tower, and the water level will rise directly from below the set value to above the set value. The float, pressure rod and buoy will float up at the same time as the water level rises. The float cannot control the rotation of the shaft to close the valve in real time through the connecting rod. The height control part of the pressure rod first contacts the lower surface of the limit plate and is immediately pressed down to undergo elastic deformation. The pressure rod controls the rotation of the shaft to close the valve in real time. At this time, the power to close the valve comes from the pressure of the pressure rod rather than the buoyancy of the float, and finally the float is released.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adopts a design consisting of a connecting rod, a floating ball and a pressure rod, wherein the end of the pressure rod is elastically designed to achieve the effect of dual water level control, that is, when the water level is low, the floating ball is preferentially floated up by buoyancy, and the floating ball is used to drive the connecting rod to rotate and close the valve to achieve the effect of stopping water replenishment. If the floating ball continues to float up, the buoy will also float up accordingly; when the water level rises suddenly, the pressure rod drives the rotating shaft to close, and at the same time the floating ball and the connecting rod are released at the end to ensure that the rotating shaft fixed to the valve core is subjected to transitional force, so as to protect the mechanical structure of the valve and further improve the reliability of water level control.

[0024] The height control part made of elastic material in the present invention eliminates the contact error between the limit frame and the limit plate, ensuring that the pressure rod is sufficiently stressed and reliably drives the valve to close whether the float approaches or hits the limit plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is the working condition diagram of the present invention at a lower water level;

[0026] Figure 2 This is the working condition diagram of the present invention when the water level changes suddenly;

[0027] Figure 3 It is a schematic diagram of the overall structure of the cooling tower of the present invention.

[0028] In the figure: 1. water level frame; 11. limit frame; 12. limit plate; 13. guide column; 2. float; 3. valve; 31. rotating shaft; 32. connecting rod; 33. pressure rod; 331. height control unit; 34. float; 4. packing; 5. fan. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Embodiment 1:

[0032] like Figure 1 and Figure 2 As shown, a water level control device comprises:

[0033] The water level frame 1 has a guide structure and a limit structure fixedly installed on it.

[0034] The guide structure includes two vertically arranged guide columns 13, the bottoms of the two guide columns 13 are fixedly connected to the bottom upper surface of the water level frame 1, and when the water level changes, the two guide columns 13 are used to control the buoy 2 to always maintain vertical movement so that it cannot deviate in the left and right directions;

[0035] The limiting structure includes a limiting frame 11 and a limiting plate 12. The limiting frame 11 is fixedly connected to the lower surface of the limiting plate 12. The limiting frame 11 is used to control the floating height of the buoy 2. The limiting plate 12 is horizontally fixedly connected to the top of the side wall of the water level frame 1. The limiting plate 12 is used to limit the vertical rising height of the pressure rod 33 and then control the pressure rod 33 to drive the rotating shaft 31 to rotate and close the valve 3.

[0036] The dual water level control mechanism includes:

[0037] The buoy 2 is slidably connected with the guide column 13, so that the buoy 2 and the water level frame 1 are movable. The buoy 2 limits its floating height under the action of the limit frame 11;

[0038] Valve 3, valve 3 is fixedly installed on the buoy 2, and a switch structure is installed on the valve 3, the switch structure includes a rotating shaft 31, a connecting rod 32, a pressure rod 33 and a floating ball 34, the rotating shaft 31 is fixedly connected to the valve core of the valve 3, one end of the connecting rod 32 is fixedly connected to the rotating shaft 31, and the other end is fixedly connected to the floating ball 34, when the floating ball 34 floats up, it can drive the rotating shaft 31 to rotate to realize the closing of the valve 3, one end of the pressure rod 33 is fixedly connected to the rotating shaft 31, and the other end is freely set, and the freely set end of the pressure rod 33 is provided with an upwardly folded height control part 331, the height control part 331 is made of elastic material, and the pressure rod 33 automatically closes the valve 3 under the action of the limit plate 12 to control the water level. The height control part 331 of the pressure rod 33 can eliminate the contact error between the limit plate 12 and the limit frame 11, and ensure that the pressure rod 33 is sufficient to bear the force and reliably drive the valve 3 to close whether the buoy 2 is close to or against the limit plate 12. It can also ensure that the valve core of the valve 3 is not over-stressed, thereby ensuring the mechanical structure of the valve 3 and improving the reliability of water level control. The connecting rod 32 and the pressure rod 33 fixed to the float 34 control the valve 3 to close and stop replenishing water when the water level is low and the water level rises suddenly. Since the valve 3 needs to float up and down with the water level, a hose is used for internal water supply. The float 34 is first floated up by buoyancy to close the valve 3 and then floats up with the buoy 2 during the floating process.

[0039] Embodiment 2:

[0040] like Figure 3 As shown, a cooling tower includes the water level control device and cooling system in Example 1, the water level control device is fixedly installed at the bottom of the cooling tower to control the water level, the cooling system includes a fan 5 and fillers 4 located on both sides of the fan 5, the bottoms of the fillers 4 on both sides are inclined toward the side close to the fan 5, and the fillers 4 and the fan 5 are used in combination to increase the heat dissipation of water entering the cooling tower, extend the cooling water residence time, increase the heat exchange area, and increase the heat exchange amount.

[0041] Embodiment 3:

[0042] like Figure 1 and Figure 3 As shown, a water level control method for a cooling tower comprises the following steps:

[0043] When the water level in the cooling tower is lower than the set value: the buoy 2 falls on the bottom of the water level rack 1, and as the water level drops, the float 34 controls the shaft 31 to rotate and open the valve 3 in real time through the connecting rod 32, and the outside water enters the cooling tower through the pipeline and the valve 3 for water replenishment; the float 34 will float up at the same time as the water level rises, and the buoy 2 remains at the current position. When the water level reaches the set value, the float 34 controls the shaft 31 to rotate and close the valve 3 in real time through the connecting rod 32 again, stops water replenishment, and maintains the dynamic balance of the water level.

[0044] Embodiment 4:

[0045] like Figure 2 and Figure 3 As shown, a water level control method for a cooling tower comprises the following steps:

[0046] When the unit is shut down: the water in the pipe at the top of the cooling tower will flow back into the cooling tower, and the water level will rise directly from below the set value to above the set value. The float 34, the pressure rod 33 and the buoy 2 will float up at the same time as the water level rises. The buoy 2 floats vertically upward guided by the guide column 13. At this time, the float 34 cannot control the rotating shaft 31 to close the valve 3 in real time through the connecting rod 32. The height control part 331 of the pressure rod 33 first contacts the lower surface of the limit plate 12 and is then pressed down to undergo elastic deformation. The pressure rod 33 controls the rotating shaft 31 to rotate and close the valve 3 in real time. At this time, the power to close the valve 3 comes from the pressure of the pressure rod 33 rather than the buoyancy of the float 34, and finally the float 34 is released.

[0047] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A water level control device, characterized in that: include: A water level frame (1), wherein a guide structure and a limit structure are fixedly mounted on the water level frame (1); A dual water level control mechanism, the dual water level control mechanism is movably arranged on the water level frame (1) through a guide structure, and the dual water level control mechanism controls the water level under the action of the limit structure; The dual water level control mechanism comprises: A buoy (2), wherein the buoy (2) is movably arranged with the water level frame (1) through a guide structure, and the buoy (2) limits its own floating height under the action of a limiting structure; A valve (3), the valve (3) being fixedly mounted on the buoy (2), the valve (3) being provided with a switch structure, the switch structure automatically controlling the water level under the combined action of the buoy (2) and the limit structure; The switch structure comprises a rotating shaft (31), a connecting rod (32), a pressure rod (33) and a floating ball (34); the rotating shaft (31) is fixedly connected to the valve core of the valve (3); one end of the connecting rod (32) is fixedly connected to the rotating shaft (31) and the other end is fixedly connected to the floating ball (34); one end of the pressure rod (33) is fixedly connected to the rotating shaft (31) and the other end is freely arranged; the freely arranged end of the pressure rod (33) automatically closes the valve (3) to control the water level under the action of the limiting structure; during the floating process, the floating ball (34) first floats up to close the valve (3) due to the buoyancy and then floats up together with the buoy (2); One end of the pressure rod (33) that is freely disposed is provided with a height control portion (331) that is folded upward, and the height control portion (331) is made of an elastic material; The limiting structure comprises a limiting frame (11) and a limiting plate (12); the limiting frame (11) is fixedly connected to the lower surface of the limiting plate (12); the limiting frame (11) is used to control the height of the buoy (2); the limiting plate (12) is horizontally fixedly connected to the top of the water level frame (1); and the limiting plate (12) is used to control the rising height of the limiting pressure rod (33) in the vertical direction.

2. A water level control device according to claim 1, characterized in that: The guide structure comprises two vertically arranged guide columns (13), the two guide columns (13) are fixedly connected to the bottom of the water level frame (1), and when the water level changes, the two guide columns (13) are used to control the buoy (2) to always maintain vertical movement.

3. A cooling tower, comprising a cooling system, characterized in that: It also includes the water level control device as described in claim 2, which is fixedly installed inside the cooling tower. The cooling system includes a fan (5) and fillers (4) located on both sides of the fan (5), and the bottoms of the fillers (4) on both sides are inclined toward the side close to the fan (5).

4. A method for controlling the water level of a cooling tower, comprising the cooling tower according to claim 3, characterized in that: The following steps are involved: When the water level in the cooling tower is lower than the set value, the buoy (2) falls on the bottom surface of the cooling tower. As the water level drops, the float (34) controls the shaft (31) to rotate and open the valve (3) in real time through the connecting rod (32). Water from the outside enters the cooling tower through the pipeline and the valve (3) for water replenishment. The float (34) will float up as the water level rises, while the buoy (2) remains at the current position. When the water level reaches the set value, the float (34) controls the shaft (31) to rotate and close the valve (3) again through the connecting rod (32), stopping water replenishment and maintaining the dynamic balance of the water level.

5. A method for controlling the water level of a cooling tower, comprising the cooling tower according to claim 3, characterized in that: The following steps are involved: When the unit is shut down, water in the pipe at the top of the cooling tower will flow back into the cooling tower, and the water level will rise directly from below the set value to above the set value. The float (34), the pressure rod (33) and the buoy (2) will float up simultaneously as the water level rises. At this time, the float (34) cannot control the rotating shaft (31) to close the valve (3) in real time through the connecting rod (32). The height control part (331) of the pressure rod (33) first contacts the lower surface of the limit plate (12) and is then pressed down to undergo elastic deformation. The pressure rod (33) controls the rotating shaft (31) to rotate and close the valve (3) in real time. At this time, the power for closing the valve (3) comes from the pressure of the pressure rod (33) rather than the buoyancy of the float (34), and finally the float (34) is released.

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