Cooling tower pipeline system based on differential pressure control

Abstract

The utility model discloses a cooling tower pipeline system based on differential pressure control, include: cooling tower subassembly, cooling tower subassembly includes at least two cooling towers, pipeline subassembly, pipeline subassembly includes at least two parallelly connected branch pipe, and the branch pipe includes primary liquid inlet branch pipe and liquid outlet branch pipe, and primary liquid inlet branch pipe is communicated with liquid outlet branch pipe through corresponding cooling tower, regulating valve subassembly includes first regulating valve, and primary liquid inlet branch pipe is provided with at least one first regulating valve, sensor subassembly, sensor subassembly includes at least two differential pressure sensor, and primary liquid inlet branch pipe is provided with at least one differential pressure sensor, the utility model discloses through setting differential pressure sensor detection primary liquid inlet branch pipe's static pressure value on primary liquid inlet branch pipe, can obtain the differential pressure value between each cooling tower, through the differential pressure value control first regulating valve unit's opening degree on each primary liquid inlet branch pipe of each cooling tower, so that each cooling tower water inflow is basically identical, improves system energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, and in particular to a cooling tower piping system based on differential pressure control. Background Technology

[0002] Cooling tower piping systems are indispensable equipment in central air conditioning systems, primarily used to dissipate heat from building air conditioning systems into the atmosphere. These systems often connect multiple cooling towers in series or parallel. The water flow rate entering each cooling tower is mainly determined by the resistance of the water pump and piping system. However, due to factors such as unbalanced piping layout and water flow resistance, the water flow rate entering each cooling tower can be uneven. Some cooling towers may experience flow rates exceeding their rated flow, while others may experience flow rates below their rated flow, resulting in underflow. This inconsistent water supply leads to insufficient utilization of the packing material in underflowing cooling towers, reducing heat dissipation and thus lowering the cooling tower's efficiency. Conversely, overflowing cooling towers may experience overflow.

[0003] In order to avoid the imbalance of water flow among multiple cooling towers in the cooling tower water supply pipeline system, the following solution is adopted in related technologies: ensure the hydraulic balance of the pipelines of each cooling tower during the design stage, and try to make the resistance of the inlet pipe of each cooling tower similar. For a large number of cooling towers, the design is difficult and it is hard to achieve that the resistance of the inlet pipe of each cooling tower is basically the same. Utility Model Content

[0004] The purpose of this invention is to disclose a cooling tower piping system based on differential pressure control. This invention detects the static pressure value of the primary inlet branch pipe by setting a differential pressure sensor on the primary inlet branch pipe, thereby obtaining the differential pressure value between each primary inlet branch pipe, and further obtaining the differential pressure value between each cooling tower. The opening degree of the first regulating valve unit on each primary inlet branch pipe is controlled by the differential pressure value of each cooling tower, so as to make the water inflow of each cooling tower basically the same and improve the system energy efficiency.

[0005] To achieve the above objectives, this utility model discloses a cooling tower piping system based on differential pressure control, comprising:

[0006] A cooling tower assembly, comprising at least two cooling towers connected in series;

[0007] The piping assembly includes an inlet main pipe, an outlet main pipe, and at least two parallel branch pipes. The inlet main pipe is connected to the outlet main pipe through at least two branch pipes. The branch pipes are correspondingly set with the cooling towers. The branch pipes include a primary inlet branch pipe and an outlet branch pipe. The primary inlet branch pipe is connected to the outlet branch pipe through the corresponding cooling tower.

[0008] The regulating valve assembly includes a first regulating valve, and at least one first regulating valve is provided on the first-stage inlet branch pipe;

[0009] The sensor assembly includes at least two differential pressure sensors, with at least one differential pressure sensor installed on the first-stage inlet branch pipe. The differential pressure sensor is used to detect the static pressure value of the first-stage inlet branch pipe.

[0010] As an optional implementation, the branch pipe also includes at least two secondary liquid inlet branch pipes, which are connected in parallel to each other, and the primary liquid inlet branch pipe is connected to the corresponding cooling tower after passing through at least two secondary liquid inlet branch pipes.

[0011] As an optional implementation, the regulating valve assembly includes a second regulating valve, and at least one second regulating valve is provided on the secondary inlet branch pipe.

[0012] As an optional implementation, the regulating valve assembly includes a third regulating valve, and at least one third regulating valve is provided on the liquid outlet branch pipe.

[0013] As an optional implementation, when at least two first regulating valves are provided on the first-stage inlet branch pipe, the first regulating valves provided on the same first-stage inlet branch pipe are connected in series.

[0014] As an optional implementation, when at least two second regulating valves are provided on the secondary inlet branch pipe, the second regulating valves provided on the same secondary inlet branch pipe are connected in series.

[0015] As an optional implementation, when at least two third regulating valves are provided on the liquid outlet branch pipe, the third regulating valves provided on the same liquid outlet branch pipe are connected in series.

[0016] As an optional implementation, the first regulating valve is a proportional-integral type electric two-way regulating valve;

[0017] And / or, the second regulating valve is a proportional-integral type electric two-way regulating valve;

[0018] And / or, the third regulating valve is a proportional-integral type electric two-way regulating valve.

[0019] As an optional implementation, the differential pressure sensor is positioned near the outlet of the first-stage inlet branch pipe, and the differential pressure sensor is used to detect the static pressure value at the outlet of the first-stage inlet branch pipe.

[0020] As an optional implementation, the cooling tower piping system also includes a control module, which is connected to the regulating valve assembly and the sensor assembly.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model detects the static pressure value of the first-stage inlet branch pipe by setting a differential pressure sensor on the first-stage inlet branch pipe, thereby obtaining the differential pressure value between each first-stage inlet branch pipe, and further obtaining the differential pressure value between each cooling tower. The opening degree of the first regulating valve unit on each first-stage inlet branch pipe is controlled by the differential pressure value of each cooling tower, so that the water inlet flow of each cooling tower is basically the same, thereby improving the system energy efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram illustrating the use of an embodiment of this utility model.

[0025] Explanation of key figure labels:

[0026] 10. Cooling tower; 20. Inlet main pipe; 30. Outlet main pipe; 40. First-stage inlet branch pipe; 50. Outlet branch pipe; 60. First regulating valve; 70. Differential pressure sensor; 80. Second-stage inlet branch pipe; 90. Second regulating valve; 100. Third regulating valve; 110. Fluid pump; 120. Unit. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0029] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0031] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0032] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0033] Please see Figure 1 This application provides a cooling tower 10 piping system based on differential pressure control, comprising: a cooling tower assembly, which includes at least two cooling towers 10 connected in series; a piping assembly, which includes an inlet main pipe 20, an outlet main pipe 30, and at least two parallel branch pipes, wherein the inlet main pipe 20 is connected to the outlet main pipe 30 through the at least two branch pipes, and the branch pipes are correspondingly arranged with respect to the cooling towers 10, including a primary inlet branch pipe 40 and an outlet branch pipe 50, wherein the primary inlet branch pipe 40 is connected to the outlet branch pipe 50 through the corresponding cooling tower 10; a regulating valve assembly, which includes a first regulating valve 60, wherein at least one first regulating valve 60 is provided on the primary inlet branch pipe 40; and a sensor assembly, which includes at least two differential pressure sensors 70, wherein at least one differential pressure sensor 70 is provided on the primary inlet branch pipe 40, wherein the differential pressure sensor 70 is used to detect the static pressure value of the primary inlet branch pipe 40.

[0034] This invention uses a differential pressure sensor 70 installed on the primary inlet branch pipe 40 to detect the static pressure value of the primary inlet branch pipe 40, thereby obtaining the pressure difference value between each primary inlet branch pipe 40, and further obtaining the pressure difference value between each cooling tower 10. The opening degree of the first regulating valve 60 unit on each primary inlet branch pipe 40 is controlled by the pressure difference value of each cooling tower 10, so that the water inlet flow of each cooling tower 10 is basically the same, thereby improving the system energy efficiency.

[0035] It should be noted that this differential pressure-controlled cooling tower piping system is applied to an air conditioning system. The fluid flowing in this differential pressure-controlled cooling tower management system is a refrigerant, such as water. The aforementioned static pressure refers to the pressure exerted vertically on the wall of the primary inlet branch pipe 40 by the refrigerant flowing in the differential pressure-controlled cooling tower piping system. The static pressure value refers to the magnitude of the pressure exerted vertically on the wall of the primary inlet branch pipe 40 by the refrigerant flowing in the differential pressure-controlled cooling tower piping system. The differential pressure sensor 70 can detect the static pressure value of the primary inlet branch pipe 40 in real time.

[0036] Continue reading Figure 1 For example, four cooling towers 10 are set up in parallel. Each primary inlet branch pipe 40 is equipped with a first regulating valve 60 and a differential pressure sensor 70. The differential pressure sensor 70 is used to detect the static pressure value of the primary inlet branch pipe 40. By comparing the static pressure values ​​of the four primary inlet branch pipes 40, if the maximum static pressure value / minimum static pressure value is ≥ a and 110% ≤ a ≤ 130%, the opening of the first regulating valve 60 on the primary inlet branch pipe 40 with the minimum static pressure value can be increased until the maximum static pressure value / minimum static pressure value is ≤ 110%. If the first regulating valve 60 on the primary inlet branch pipe 40 with the minimum static pressure value is fully open and a ≥ 110%, the opening of the first regulating valve 60 on the primary inlet branch pipe 40 with the maximum static pressure value can be decreased until a ≤ 110%.

[0037] According to Bernoulli's equation, with the pipe cross-section remaining constant, as the flow rate increases, the static pressure decreases. If the maximum static pressure / minimum static pressure is ≥ a and 110% ≤ a ≤ 130%, the opening of the first regulating valve 60 on the first-stage inlet branch 40 with the minimum static pressure can be increased. Consequently, the static pressure of the first-stage inlet branch 40 with the minimum static pressure increases, and the static pressure difference between the first-stage inlet branch 40 with the maximum static pressure and the first-stage inlet branch 40 with the minimum static pressure decreases until the maximum static pressure / minimum static pressure is ≤ 110%. This process is repeated continuously until the static pressure on each first-stage inlet branch 40 is basically consistent, thus ensuring that the inlet flow rate of each cooling tower 10 is basically consistent. This process is a dynamic adjustment process.

[0038] In this embodiment of the utility model, the branch pipe also includes at least two secondary liquid inlet branch pipes 80, which are connected in parallel to each other, and the primary liquid inlet branch pipe 40 is connected to the corresponding cooling tower 10 after passing through at least two secondary liquid inlet branch pipes 80.

[0039] In this way, both secondary liquid inlet branches 80 can be filled with liquid. If one of the secondary liquid inlet branches 80 malfunctions and cannot fill with liquid, the other secondary liquid inlet branch 80 can still fill with liquid.

[0040] In this embodiment of the utility model, the regulating valve assembly includes a second regulating valve 90, and at least one second regulating valve 90 is provided on the secondary liquid inlet branch pipe 80.

[0041] In this embodiment of the utility model, the regulating valve assembly includes a third regulating valve 100, and at least one third regulating valve 100 is provided on the liquid outlet branch pipe 50.

[0042] In this embodiment of the utility model, when at least two first regulating valves 60 are provided on the first-stage inlet branch pipe 40, the first regulating valves 60 provided on the same first-stage inlet branch pipe 40 are connected in series.

[0043] In this embodiment of the utility model, when at least two second regulating valves 90 are provided on the secondary liquid inlet branch pipe 80, the second regulating valves 90 provided on the same secondary liquid inlet branch pipe 80 are connected in series.

[0044] In this embodiment of the utility model, when at least two third regulating valves 100 are provided on the liquid outlet branch pipe 50, the third regulating valves 100 provided on the same liquid outlet branch pipe 50 are connected in series.

[0045] See Figure 1 For example, four cooling towers 10 can be set up, and the four cooling towers 10 can be connected in parallel by setting up four branch pipes. Each first-stage liquid inlet branch pipe 40 is equipped with two first regulating valves 60, which are connected in series on the first-stage liquid inlet branch pipe 40. A differential pressure sensor 70 is installed on the first-stage liquid inlet branch pipe 40 to detect the static pressure value of the first-stage liquid inlet branch pipe 40. A second regulating valve 90 is installed on the second-stage liquid inlet branch pipe 80, and two third regulating valves 100 are installed on the liquid outlet branch pipe 50, which are connected in series on the liquid outlet branch pipe 50.

[0046] Two first regulating valves 60 are connected in series on the first-stage inlet branch pipe 40. The first regulating valve 60 into which the fluid flows first is the first pre-regulating valve, forming the first regulation. The first regulating valve 60 into which the fluid flows later is the first post-regulating valve, forming the second regulation. For example, when the opening degree of the first pre-regulating valve is 50% and the opening degree of the first post-regulating valve is 50%, the total opening degree of the regulating assembly formed by the first pre-regulating valve and the first post-regulating valve is 25%. For example, when the opening degree of the first pre-regulating valve is 50% and the opening degree of the first post-regulating valve is 100%, the total opening degree of the regulating assembly formed by the first pre-regulating valve and the first post-regulating valve is 50%. In other words, the two first regulating valves 60 connected in series form a two-stage regulation, thereby making the flow regulation of the first-stage inlet branch pipe 40 more precise.

[0047] Since the two third regulating valves 100 are connected in series on the outlet branch pipe 50, the third regulating valve 100 from which the fluid flows out first is the third pre-regulating valve, which forms the first regulation. The third regulating valve 100 from which the fluid flows out last is the third post-regulating valve, which forms the second regulation. For example, when the opening degree of the third pre-regulating valve is 50% and the opening degree of the third post-regulating valve is 50%, the total opening degree of the regulating component formed by the third pre-regulating valve and the third post-regulating valve is 25%. For example, when the opening degree of the third pre-regulating valve is 50% and the opening degree of the third post-regulating valve is 100%, the total opening degree of the regulating component formed by the third pre-regulating valve and the third post-regulating valve is 50%. In other words, the two third regulating valves 100 connected in series form a two-stage regulation, thereby making the flow regulation of the outlet branch pipe 50 more precise.

[0048] In this embodiment of the present invention, in order to improve the adjustment efficiency of the above-mentioned dynamic adjustment process, the first regulating valve 60 is an electric regulating valve. The electric regulating valve can be a conventional electric regulating valve, such as a proportional integral electric two-way regulating valve.

[0049] In this embodiment of the present invention, in order to improve the adjustment efficiency of the above-mentioned dynamic adjustment process, the first regulating valve 60 is an electric regulating valve. The electric regulating valve can be a conventional electric regulating valve, such as a proportional integral electric two-way regulating valve.

[0050] In this embodiment of the present invention, in order to improve the adjustment efficiency of the above-mentioned dynamic adjustment process, the first regulating valve 60 is an electric regulating valve. The electric regulating valve can be a conventional electric regulating valve, such as a proportional integral electric two-way regulating valve.

[0051] In this embodiment of the present invention, the differential pressure sensor 70 is located near the outlet of the first-stage inlet branch pipe 40, and the differential pressure sensor 70 is used to detect the static pressure value at the outlet of the first-stage inlet branch pipe 40.

[0052] In this embodiment of the invention, the cooling tower piping system further includes a control module, which is connected to the regulating valve assembly and the sensor assembly.

[0053] Specifically, the control module can be directly integrated with existing control modules. The adjustment components and sensor components are electrically connected to or communicate with the control module. The electrical connection or communication method can also be directly integrated with existing methods. The differential pressure sensors 70 on each primary inlet branch pipe 40 can transmit the detected static pressure value to the control center in real time. The control center compares the received static pressure values ​​on each primary inlet branch pipe 40 in real time and controls the opening of the first regulating valve 60 on each primary inlet branch pipe 40, the second regulating valve 90 on each secondary inlet branch pipe 80, and the third regulating valve 100 on each outlet branch pipe 50 based on the comparison results. Compared to manually reading and comparing the static pressure values ​​detected by the differential pressure sensors 70 on each primary inlet branch pipe 40, and manually controlling the opening of the first regulating valve 60 on each primary inlet branch pipe 40, the second regulating valve 90 on each secondary inlet branch pipe 80, and the third regulating valve 100 on each outlet branch pipe 50, the control center-based regulation method is more efficient and convenient.

[0054] See Figures 1 to 2 In practical use, the liquid outlet main pipe 30 can be connected to the liquid inlet of the unit 120 through the fluid pump 110, and the liquid outlet of the unit 120 can be connected to the liquid inlet main pipe 20, thereby forming a pipeline circulation.

[0055] The above provides a detailed description of a cooling tower piping system based on differential pressure control according to embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the cooling tower piping system based on differential pressure control and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cooling tower piping system based on differential pressure control, characterized in that, include: A cooling tower assembly comprising at least two cooling towers (10) connected in series with each other; The piping assembly includes an inlet main pipe (20), an outlet main pipe (30), and at least two parallel branch pipes. The inlet main pipe (20) is connected to the outlet main pipe (30) through at least two of the branch pipes. The branch pipes are correspondingly arranged with the cooling tower (10). Each branch pipe includes a primary inlet branch pipe (40) and an outlet branch pipe (50). The primary inlet branch pipe (40) is connected to the outlet branch pipe (50) through the corresponding cooling tower (10). A regulating valve assembly, the regulating valve assembly including a first regulating valve (60), and at least one of the first regulating valves (60) is provided on the first-stage inlet branch pipe (40). The sensor assembly includes at least two differential pressure sensors (70), and at least one of the differential pressure sensors (70) is provided on the first-stage inlet branch pipe (40). The differential pressure sensor (70) is used to detect the static pressure value of the first-stage inlet branch pipe (40).

2. The cooling tower piping system based on differential pressure control according to claim 1, characterized in that: The branch pipe also includes at least two secondary liquid inlet branch pipes (80), which are connected in parallel to each other. The primary liquid inlet branch pipe (40) is connected to the corresponding cooling tower (10) after passing through at least two of the secondary liquid inlet branch pipes (80).

3. The cooling tower piping system based on differential pressure control according to claim 2, characterized in that: The regulating valve assembly includes a second regulating valve (90), and at least one second regulating valve (90) is provided on the secondary inlet branch pipe (80).

4. The cooling tower piping system based on differential pressure control according to claim 3, characterized in that: The regulating valve assembly includes a third regulating valve (100), and at least one of the third regulating valves (100) is provided on the liquid outlet branch pipe (50).

5. The cooling tower piping system based on differential pressure control according to claim 4, characterized in that: When at least two first regulating valves (60) are provided on the first-stage inlet branch pipe (40), the first regulating valves (60) provided on the same first-stage inlet branch pipe (40) are connected in series.

6. The cooling tower piping system based on differential pressure control according to claim 5, characterized in that: When at least two second regulating valves (90) are provided on the secondary inlet branch pipe (80), the second regulating valves (90) provided on the same secondary inlet branch pipe (80) are connected in series.

7. The cooling tower piping system based on differential pressure control according to claim 6, characterized in that: When at least two third regulating valves (100) are provided on the liquid outlet branch pipe (50), the third regulating valves (100) provided on the same liquid outlet branch pipe (50) are connected in series.

8. The cooling tower piping system based on differential pressure control according to claim 7, characterized in that: The first regulating valve (60) is a proportional-integral type electric two-way regulating valve; And / or, the second regulating valve (90) is a proportional-integral type electric two-way regulating valve; And / or, the third regulating valve (100) is a proportional-integral type electric two-way regulating valve.

9. The cooling tower piping system based on differential pressure control according to any one of claims 1-8, characterized in that: The differential pressure sensor (70) is located near the outlet of the first-stage inlet branch pipe (40), and the differential pressure sensor (70) is used to detect the static pressure value at the outlet of the first-stage inlet branch pipe (40).

10. The cooling tower piping system based on differential pressure control according to any one of claims 1-8, characterized in that: The cooling tower piping system also includes a control module, which is connected to the regulating valve assembly and the sensor assembly.

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