Differential pressure balance control system for heating and ventilation pipe network

Abstract

The utility model discloses a heating and ventilation pipe network differential pressure balance control system which comprises a refrigeration assembly, a control assembly and a control assembly. The water return pipeline is connected with the water inlet end of the refrigeration assembly; the water supply pipeline is connected with the water outlet end of the refrigeration assembly; the water outlet end of the near-end user is connected with the water return pipeline through a pipeline, the water inlet end of the near-end user is connected with the water supply pipeline through a pipeline, and the near-end user is arranged close to the refrigeration assembly; the water outlet end of the far-end user is connected with the water return pipeline through a far-end water outlet pipeline, the water inlet end of the far-end user is connected with the water supply pipeline through a far-end water inlet pipeline, and the far-end user is arranged far away from the refrigeration assembly; the cold water primary pump set is arranged on the water return pipeline and is close to the refrigeration assembly; and the cold water secondary pump is arranged on the far-end water inlet pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of HVAC, in particular to a HVAC pipe network pressure difference balance control system. Background Art

[0002] In the field of HVAC, cold water is usually used as the refrigerant medium to transfer the "cold" to the air-conditioned area and release it to achieve the purpose of cooling. When the transmission distance is long, the resistance of the refrigerant water circulation line section is small for the near-end user (close to the refrigeration station) compared to the far-end user (far from the refrigeration), and only a small pressure difference is required. If a traditional one-time pump refrigerant water circulation system is used, the far-end user will reach the lower limit of the pressure difference, and the near-end user will be over-pressured, which may damage the air-conditioning equipment of the near-end user and also cause waste of transmission energy consumption of the circulating water pump.

[0003] Therefore, in view of the shortcomings of the existing technology, it is necessary to design a HVAC pipe network pressure difference balance control system to solve the above problems. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the utility model aims to provide a pressure difference balance control system for a HVAC pipe network.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by the utility model is: a HVAC pipe network pressure difference balance control system, comprising:

[0006] Refrigeration components;

[0007] A water return pipeline, the water return pipeline is connected to the water inlet end of the refrigeration component;

[0008] A water supply pipeline, the water supply pipeline is connected to the water outlet end of the refrigeration component;

[0009] A near-end user, wherein the water outlet of the near-end user is connected to the water return pipeline through a pipeline, the water inlet of the near-end user is connected to the water supply pipeline through a pipeline, and the near-end user is arranged close to the refrigeration assembly;

[0010] A remote user, wherein a water outlet of the remote user is connected to the water return pipeline via a remote water outlet pipeline, a water inlet of the remote user is connected to the water supply pipeline via a remote water inlet pipeline, and the remote user is arranged far away from the refrigeration assembly;

[0011] A primary cold water pump set, the primary cold water pump set is arranged on the return water pipeline and close to the refrigeration assembly;

[0012] A secondary cold water pump is arranged on the remote water inlet pipeline.

[0013] The preferred technical solution is: a first water outlet pressure sensor is provided on the return water pipeline close to the proximal user.

[0014] The preferred technical solution is: a first water inlet pressure sensor is provided on the water supply pipeline close to the proximal user.

[0015] The preferred technical solution is: a second water outlet pressure sensor is provided on the remote water outlet pipeline.

[0016] The preferred technical solution is: a second water inlet pressure sensor is provided on the remote water inlet pipeline.

[0017] The preferred technical solution is: it also includes a PLC controller, and the PLC controller is simultaneously connected to the primary cold water pump group, the secondary cold water pump, the first water inlet pressure sensor, the first water outlet pressure sensor, the second water inlet pressure sensor and the second water outlet pressure sensor signal.

[0018] Due to the application of the above technical solution, the utility model has the following beneficial effects:

[0019] The utility model proposes a HVAC pipe network pressure difference balance control system, which adds a secondary pump, i.e. a control system, on the basis of the original refrigerant water circulation network. The primary cold water pump group is selected according to the pressure difference demand of the near-end users (without considering the remote users), and the secondary cold water pump is selected according to the pressure difference demand of the remote users. The selection is carried out in sections and in a "relay" manner to meet the user needs and reduce the overall transportation energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an energy-saving system for optimizing and adjusting the number and frequency of operating secondary cold water pumps involved in the utility model. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] See also Figure 1. It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply 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 utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example:

[0025] like Figure 1 As shown, according to an overall technical concept of the utility model, a HVAC network pressure difference balance control system is provided, comprising:

[0026] The refrigeration assembly 1 is composed of a plurality of refrigeration units 11 arranged in parallel;

[0027] A water return pipe 2, the water return pipe 2 is connected to the water inlet end of the refrigeration component 1;

[0028] A water supply pipeline 3, the water supply pipeline 3 is connected to the water outlet end of the refrigeration component 1;

[0029] A near-end user 4, the water outlet of the near-end user 4 is connected to the water return pipeline 2 through a pipeline, the water inlet of the near-end user 4 is connected to the water supply pipeline 3 through a pipeline, and the near-end user 4 is arranged close to the refrigeration component;

[0030] A remote user 5, a water outlet of the remote user 5 is connected to the water return pipeline 2 via a remote water outlet pipeline 51, a water inlet of the remote user 5 is connected to the water supply pipeline 3 via a remote water inlet pipeline 52, and the remote user 5 is arranged far away from the refrigeration assembly 1;

[0031] A cold water primary pump group 6, which is arranged on the return water pipeline 2 and close to the refrigeration assembly 1, and is composed of a plurality of cold water primary pumps 61 arranged in parallel;

[0032] The cold water secondary pump 7 is arranged on the remote water inlet pipeline 52 .

[0033] like Figure 1 As shown, in an exemplary embodiment of the present utility model, a first water outlet pressure sensor (not shown, used to monitor the water pressure P2 of the water return pipeline 2 near the near-end user 4) is provided on the water return pipeline 2 near the near-end user 4.

[0034] like Figure 1 As shown, in an exemplary embodiment of the present utility model, a first water inlet pressure sensor (not shown, used to monitor the water pressure P1 of the water supply pipeline 3 near the near-end user 4) is provided on the water supply pipeline 3 near the near-end user 4.

[0035] like Figure 1 As shown, in an exemplary embodiment of the present utility model, a second water outlet pressure sensor (not shown, used to monitor the water pressure P4 in the remote water outlet pipeline 51 ) is provided on the remote water outlet pipeline 51 .

[0036] like Figure 1 As shown, in an exemplary embodiment of the present utility model, a second water inlet pressure sensor (not shown, used to monitor the water pressure P3 in the remote water inlet pipeline 52 ) is provided on the remote water inlet pipeline 52 .

[0037] like Figure 1 As shown, in an exemplary embodiment of the utility model, a PLC controller 8 is also included, and the PLC controller 8 is simultaneously connected to the cold water primary pump group 6, the cold water secondary pump 7, the first water inlet pressure sensor, the first water outlet pressure sensor, the second water inlet pressure sensor and the second water outlet pressure sensor signal.

[0038] When the system is running:

[0039] △Pj=P1-P2 (water pressure difference of near-end users); △Py=P3-P4 (water pressure difference of far-end users);

[0040] When △Pj is lower than the set threshold lower limit, the cold water primary pump group 6 increases the frequency until it exceeds the threshold lower limit;

[0041] When △Pj is higher than the set upper threshold, the cold water primary pump group 6 reduces the frequency until it is lower than the upper threshold;

[0042] Before the secondary cold water pump 5 is started, the detection conditions are: Is the primary cold water pump group 6 started? Is △Pj within the set threshold range?

[0043] When the primary cold water pump group 6 is running and △Pj is within the set threshold range, and △Py is lower than the lower limit of the set threshold, the secondary cold water pump group 5 increases the frequency until it exceeds the lower limit of the threshold;

[0044] When the primary cold water pump group 6 is running and ΔPj is within the set threshold range, and ΔPy is higher than the set upper threshold, the secondary cold water pump 7 reduces the frequency until it is lower than the upper threshold.

[0045] Therefore, the utility model has the following advantages:

[0046] The utility model proposes a HVAC pipe network pressure difference balance control system, which adds a secondary pump, i.e. a control system, on the basis of the original refrigerant water circulation network. The primary cold water pump group is selected according to the pressure difference demand of the near-end users (without considering the remote users), and the secondary cold water pump is selected according to the pressure difference demand of the remote users. The selection is carried out in sections and in a "relay" manner to meet the user needs and reduce the overall transportation energy consumption.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A HVAC network pressure difference balance control system, characterized in that: include: Refrigeration components; A water return pipeline, the water return pipeline is connected to the water inlet end of the refrigeration component; A water supply pipeline, the water supply pipeline is connected to the water outlet end of the refrigeration component; A near-end user, wherein the water outlet of the near-end user is connected to the water return pipeline through a pipeline, the water inlet of the near-end user is connected to the water supply pipeline through a pipeline, and the near-end user is arranged close to the refrigeration assembly; A remote user, wherein a water outlet of the remote user is connected to the water return pipeline via a remote water outlet pipeline, a water inlet of the remote user is connected to the water supply pipeline via a remote water inlet pipeline, and the remote user is arranged far away from the refrigeration assembly; A primary cold water pump set, the primary cold water pump set is arranged on the return water pipeline and close to the refrigeration assembly; A secondary cold water pump is arranged on the remote water inlet pipeline.

2. A HVAC network pressure difference balance control system according to claim 1, characterized in that: A first water outlet pressure sensor is arranged on the water return pipe near the proximal user.

3. A HVAC network pressure difference balance control system according to claim 2, characterized in that: A first water inlet pressure sensor is arranged on the water supply pipeline close to the proximal user.

4. A HVAC network pressure difference balance control system according to claim 3, characterized in that: A second water outlet pressure sensor is arranged on the remote water outlet pipeline.

5. A HVAC network pressure difference balance control system according to claim 4, characterized in that: A second water inlet pressure sensor is arranged on the remote water inlet pipeline.

6. A HVAC network pressure difference balance control system according to claim 5, characterized in that: It also includes a PLC controller, which is simultaneously connected to the cold water primary pump group, the cold water secondary pump, the first water inlet pressure sensor, the first water outlet pressure sensor, the second water inlet pressure sensor and the second water outlet pressure sensor signal.

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