Heat supply system

Abstract

The utility model discloses a heat supply system which comprises a heat supply network initial station, a heat exchange station, a heat supply network circulating pump, a pressure difference transmitter, a controller, a primary network water return pipe and a primary network water supply pipe. The heat supply network initial station is communicated with the primary network side of the heat exchange station through a primary network water return pipe and a primary network water supply pipe; a first interface of the pressure difference transmitter is connected with a primary network water return pipe, a second interface of the pressure difference transmitter is connected with a primary network water supply pipe, and the pressure difference transmitter is used for detecting the pressure difference between the water supply pressure and the water return pressure of the primary network; the controller is connected with the pressure difference transmitter and used for receiving pressure difference signals output by the pressure difference transmitter so as to control the frequency or the rotating speed of the heat supply network circulating pump. According to the heat supply system, when the water supply flow of any heat exchange station changes, the water supply and return pressure difference of circulating water of a secondary side heat supply network of the first heat supply station is kept unchanged, so that the water supply flow of the primary sides of other heat exchange stations does not change, and the heat exchange stations reach the required flow.

Description

Technical Field

[0001] The utility model relates to the technical field of supply and return water flow control of residential heating networks, in particular to a heating system. Background Art

[0002] The first heating station of a thermal power plant heats the secondary side heat network circulating water of the first heating station by extracting steam from the unit. The heat exchange station is arranged along the supply and return water main pipe of the heat network circulating water of the first heating station. The first heating station transmits heat to the heat exchange station continuously through the supply and return water circulation of the heat network circulating water. When the first heating station is operating normally, the outlet of the secondary side circulating water of the heat network adopts automatic pressure control, and the outlet main pipe pressure of the heat network circulating water is set. The heat network circulating pump is automatically frequency-converted or speed-automatically tracked and maintains the outlet main pipe pressure of the heat network circulating water unchanged. The heat exchange station along the outlet main pipe of the heat network circulating water of the first heating station realizes the change of the heat supply by adjusting the primary side water supply of the heat exchange station at this level.

[0003] If any heat exchange station along the supply and return main pipe of the heat network circulating water at the first heating station adjusts the water supply flow rate on the primary side of this level, it will cause the pressure change of the circulating water return main pipe on the secondary side (i.e. the primary pipe network side) of the first heating station (the heat network circulation pump automatically maintains the pressure of the water supply main pipe unchanged), that is, the pressure difference of the circulating water supply and return main pipe on the secondary side of the first heating station changes, which will cause the water supply flow rate on the primary side of other heat exchange stations to change, and ultimately all heat exchange stations will be unable to reach the required flow rate. Utility Model Content

[0004] The utility model provides a heating system which can maintain the supply and return pressure difference of the heat network circulating water on the secondary side of the heating first station unchanged when the water supply flow rate of any heat exchange station changes, thereby keeping the primary side water supply flow rate of other heat exchange stations unchanged, thereby enabling each heat exchange station to achieve the required flow rate.

[0005] The utility model provides a heating system, comprising a heating network head station, a heat exchange station, a heating network circulation pump, a pressure difference transmitter, a controller, a primary network return pipe and a primary network water supply pipe; wherein the number of heat exchange stations is n, n≥2, the number of heating network circulation pumps is m, m≥1; the heating network head station is connected with the primary network side of the heat exchange station through the primary network return pipe and the primary network water supply pipe; the heating network circulation pump is used to drive the heating network water to flow between the heating network head station, the heat exchange station, the primary network return pipe and the primary network water supply pipe; the first interface of the pressure difference transmitter is connected to the primary network return pipe, the second interface of the pressure difference transmitter is connected to the primary network water supply pipe, the pressure difference transmitter is used to detect the pressure difference between the primary pipe network water supply pressure and the return water pressure; the controller is respectively connected to the pressure difference transmitter and the heating network circulation pump, the controller is used to receive the pressure difference signal output by the pressure difference transmitter to control the frequency or speed of the heating network circulation pump.

[0006] Optionally, the heating system further includes a primary network return water pressure transmitter, which is arranged on the primary network return water pipe and is used to detect the return water pressure of the primary network.

[0007] Optionally, the heating system further includes a primary network supply water pressure transmitter, which is arranged on the primary network supply water pipe and is used to detect the supply water pressure of the primary network.

[0008] Optionally, the heating system further includes n water supply regulating valves, which are arranged one by one on the primary network supply water pipe on the primary network side of the heat exchange station. The water supply regulating valves are connected to the controller, and the controller is used to adjust the opening degree of the water supply regulating valves.

[0009] Optionally, the heating system further includes a primary network supply water temperature sensor, which is located on the primary network supply water pipe and is used to collect the supply water temperature of the primary network.

[0010] Optionally, the heating system further includes a primary network return water temperature sensor, which is located on the primary network return water pipe and is used to collect the return water temperature of the primary network.

[0011] Optionally, the heating system further includes a first flow sensor, which is located on the primary network supply water pipe and is used to collect the supply water flow of the primary network.

[0012] Optionally, the heating system further includes a second flow sensor, which is located on the primary network return water pipe and is used to collect the return water flow of the primary network.

[0013] Optionally, the heating system further includes a secondary network supply water pipe and a secondary network return water pipe; the heat exchange station is connected to multiple heat users through the secondary network supply water pipe and the secondary network return water pipe.

[0014] Optionally, the controller is further connected to a display screen for displaying the pressure difference.

[0015] The heating system provided by the embodiment of the present invention includes a heat network head station, a heat exchange station, a heat network circulation pump, a differential pressure transmitter, a controller, a primary network return water pipe, and a primary network supply water pipe. By installing the differential pressure transmitter between the primary network return water pipe and the primary network supply water pipe, the supply and return water pressure difference of the primary network can be detected. The controller receives the differential pressure signal input by the differential pressure transmitter to control the frequency or speed of the heat network circulation pump, so that the supply and return water pressure difference of the primary network remains unchanged, so that the supply water flow on the primary side of other heat exchange stations does not change, and further enables each heat exchange station to reach the required flow.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a heating system provided by an embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of another heating system provided by an embodiment of the present utility model. Detailed Description of the Embodiments

[0020] In order to enable those skilled in the art to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0022] Figure 1 is a schematic structural diagram of a heating system provided by an embodiment of the present utility model. As Figure 1 shown, the heating system includes a heat network primary station 1, a heat exchange station 2, a heat network circulation pump 3, a differential pressure transmitter 4, a controller 5, a primary network return water pipe 6, and a primary network supply water pipe 7. Among them, the number of heat exchange stations 2 is n, n≥2, and the number of heat network circulation pumps 3 is m, m≥1.

[0023] The primary heat supply station 1 is connected to the primary network side of the heat exchange station 2 through the primary network return pipe 6 and the primary network supply pipe 7; the primary heat supply circulation pump 3 is used to drive the heat supply water to flow among the primary heat supply station 1, the heat exchange station 2, the primary network return pipe 6 and the primary network supply pipe 7.

[0024] The first interface of the differential pressure transmitter 4 is connected to the primary network return pipe 6, and the second interface of the differential pressure transmitter 4 is connected to the primary network supply pipe 7. The differential pressure transmitter 4 is used to detect the differential pressure between the water supply pressure and the return water pressure of the primary pipe network.

[0025] The controller 5 is connected to the differential pressure transmitter 4. The controller 5 is used to receive the differential pressure signal output by the differential pressure transmitter 4 to control the frequency or rotational speed of the primary heat supply circulation pump 3.

[0026] Specifically, Figure 1 The case of n = 3 and m = 3 is schematically given. Among them, multiple primary heat supply circulation pumps 3 are connected in parallel.

[0027] The primary heat supply station 1, as the heat source of the entire heating system, is connected to the primary network side of multiple heat exchange stations 2 through the primary network return pipe 6 and the primary network supply pipe 7. In order to ensure the normal circulation of the heat supply water, multiple primary heat supply circulation pumps 3 are configured. These primary heat supply circulation pumps 3 continuously work to drive the heat supply water to flow stably among the primary heat supply station 1, each heat exchange station 2 and the pipes connecting them.

[0028] Between the primary network return pipe 6 and the primary network supply pipe 7, a differential pressure transmitter 4 is installed. Its first interface is connected to the primary network return pipe 6, and the second interface is connected to the primary network supply pipe 7, so as to detect the differential pressure between the water supply pressure and the return water pressure of the primary pipe network. The controller 5 connected to the differential pressure transmitter 4 receives the differential pressure signal output by it in real time and controls the frequency or rotational speed of the primary heat supply circulation pump 3 according to the differential pressure signal.

[0029] The controller 5 can be implemented by controller devices such as a microcontroller unit (MCU), a digital signal processor (DSP), a field programmable gate array (FPGA), or a programmable logic controller (PLC).

[0030] In some embodiments, when the water supply flow rate of any heat exchange station changes, that is, when the pressure difference between the primary network return pipe 6 and the primary network supply pipe 7 changes. At this time, the pressure difference detected by the pressure difference transmitter 4 is not equal to the set value, and the controller 5 issues a control instruction to increase or decrease the frequency or rotation speed of the heat network circulation pump to maintain the primary network return pipe and supply pipe. The control instructions include a first control instruction and a second control instruction.

[0031] Exemplarily, when the pressure difference detected by the pressure difference transmitter 4 is less than the set value, the controller 5 issues a first control instruction to increase the frequency or rotation speed of the heat network circulation pump 3, increase the water flow velocity, thereby increasing the pressure difference until the pressure difference detected by the pressure difference transmitter 4 is equal to the set value. When the pressure difference detected by the pressure difference transmitter 4 is greater than the set value, the controller 5 issues a second control instruction to decrease the frequency or rotation speed of the heat network circulation pump 3, slow down the water flow velocity, and reduce the pressure difference until the pressure difference detected by the pressure difference transmitter 4 is equal to the set value. With such a setting, when the water supply flow rate of any heat exchange station 2 changes, the supply and return water pressure difference of the secondary side heat network circulating water in the heat supply first station 1 can be maintained unchanged, so that the water supply flow rate on the primary side of other heat exchange stations 2 does not change, and further each heat exchange station 2 can reach the required flow rate.

[0032] The heat supply system provided by the embodiment of the present invention includes a heat network first station, a heat exchange station, a heat network circulation pump, a pressure difference transmitter, a controller, a primary network return pipe, and a primary network supply pipe. By installing the pressure difference transmitter between the primary network return pipe and the primary network supply pipe, the supply and return water pressure difference of the primary pipe network can be detected, and the controller receives the pressure difference signal input by the pressure difference transmitter to control the frequency or rotation speed of the heat network circulation pump, so that the supply and return water pressure difference of the secondary side heat network circulating water in the heat supply first station remains unchanged, so that the water supply flow rate on the primary side of other heat exchange stations does not change, and further each heat exchange station can reach the required flow rate.

[0033] In addition, in order to more comprehensively and accurately monitor and control the heat supply system, a series of other devices and components are also configured. The following are several examples:

[0034] Continue to refer to Figure 1 , optionally, the heat supply system further includes a primary network return water pressure transmitter 8, the primary network return water pressure transmitter 8 is arranged on the primary network return pipe 6, and the primary network return water pressure transmitter 8 is used to detect the return water pressure of the primary pipe network.

[0035] Optionally, the heat supply system further includes a primary network supply water pressure transmitter 9, the primary network supply water pressure transmitter 9 is arranged on the primary network supply pipe 7, and the primary network supply water pressure transmitter 9 is used to detect the supply water pressure of the primary pipe network.

[0036] Specifically, by installing a primary network return water pressure transmitter 8 on the primary network return water pipe 6 and a primary network supply water pressure transmitter 9 on the primary network supply water pipe 7, important data support can be provided for the regulation of the heating system. Exemplarily, if the return water pressure is lower than the set minimum threshold, the controller appropriately increases the frequency or speed of the heat network circulation pump 3 to increase the return water pressure; if the supply water pressure is higher than the set maximum threshold, the controller decreases the frequency or speed of the heat network circulation pump 3 to reduce the supply water pressure.

[0037] Optionally, the heating system further includes n water supply regulating valves 10, which are respectively arranged on the primary network supply water pipe 7 on the primary network side of the heat exchange station 2. The water supply regulating valves 10 are connected to the controller, and the controller 5 is used to adjust the opening degree of the water supply regulating valves 10.

[0038] In some embodiments, the controller adjusts the opening degree of the water supply regulating valve 10 according to the operating conditions and requirements of the heating system. For example, when the heating amount needs to be increased in the heating area corresponding to a certain heat exchange station 2, the controller 5 increases the opening degree of the corresponding water supply regulating valve 10; while in the area with excessive heating amount, the opening degree of the water supply regulating valve 10 is decreased.

[0039] Figure 2 It is a schematic structural diagram of another heating system provided by an embodiment of the present invention. As Figure 2 shown, optionally, the heating system further includes a primary network supply water temperature sensor 11, which is located on the primary network supply water pipe 7 and is used to collect the supply water temperature of the primary pipe network.

[0040] Optionally, the heating system further includes a primary network return water temperature sensor 12, which is located on the primary network return water pipe 3 and is used to collect the return water temperature of the primary pipe network. By monitoring the supply water temperature and the return water temperature, the heat transfer efficiency and heating effect of the heating system can be understood.

[0041] Optionally, the heating system further includes a first flow sensor 13, which is located on the primary network supply water pipe 7 and is used to collect the supply water flow of the primary pipe network.

[0042] Optionally, the heating system further includes a second flow sensor 14, which is located on the primary network return water pipe 6 and is used to collect the return water flow of the primary pipe network. According to the flow signals detected by the first flow sensor 13 and the second flow sensor 14, the controller 5 finely adjusts the frequency or speed of the heat network circulation pump 3 to ensure the flow balance of the heating system.

[0043] In some embodiments, by collecting the supply water temperature and return water temperature of the primary pipe network and combining the data of the flow sensor, the controller 5 can calculate the heat exchange quantity for heat metering of the building and use it as the basis for heating charging.

[0044] Optionally, the heating system further includes a secondary network supply pipe 15 and a secondary network return pipe 16; the heat exchange station 2 is connected to a plurality of heat users 17 through the secondary network supply pipe 15 and the secondary network return pipe 16 to achieve the final transfer and distribution of heat.

[0045] Optionally, the controller 5 is further connected to a display screen 18 for displaying the pressure difference.

[0046] Continuing to refer to Figure 2 , the working principle of the heating system provided by the present utility model is as follows:

[0047] The thermal energy generated by the heat source station 1 of the heat network is transported to each heat exchange station 2 through the primary network supply pipe 7. After heat exchange with the secondary network in the heat exchange station 2, it returns to the heat source station 1 through the primary network return pipe 6. The heat network circulation pump 3 provides power for the flow of the heat network water. The differential pressure transmitter 4 real-time detects the pressure difference between the primary network supply pipe 7 and the primary network return pipe 6 and transmits the signal to the controller 5. The controller 5 optimizes the pressure, flow rate, and temperature of the heating system by adjusting the frequency or rotation speed of the heat network circulation pump 3 and the opening degree of the water supply regulating valve 10 according to the pressure difference signal and other detected data (such as pressure, temperature, and flow rate, etc.) to ensure the stable operation and efficient heating of the entire heating system.

[0048] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heating system, characterized in that, Including: The primary heat supply station, heat exchange stations, heat network circulation pumps, differential pressure transmitters, controllers, the primary network return water pipe, and the primary network supply water pipe; where the number of the heat exchange stations is n, n≥2, and the number of the heat network circulation pumps is m, m≥1; The primary heat supply station is connected to the primary network side of the heat exchange stations through the primary network return water pipe and the primary network supply water pipe; The heat network circulation pumps are used to drive the heat network water to flow among the primary heat supply station, the heat exchange stations, the primary network return water pipe, and the primary network supply water pipe; The first interface of the differential pressure transmitter is connected to the primary network return water pipe, and the second interface of the differential pressure transmitter is connected to the primary network supply water pipe. The differential pressure transmitter is used to detect the differential pressure between the supply water pressure and the return water pressure of the primary pipe network; The controller is respectively connected to the differential pressure transmitter and the heat network circulation pumps. The controller is used to receive the differential pressure signal output by the differential pressure transmitter to control the frequency or rotational speed of the heat network circulation pumps.

2. The heating system according to claim 1, characterized in that, It further includes a primary network return water pressure transmitter which is arranged on the primary network return water pipe and is used to detect the return water pressure of the primary pipe network.

3. The heating system according to claim 1, characterized in that It further includes a primary network supply water pressure transmitter which is arranged on the primary network supply water pipe and is used to detect the supply water pressure of the primary pipe network.

4. The heating system according to claim 1, characterized in that, It further includes n water supply regulating valves which are respectively arranged on the primary network supply water pipes on the primary network side of the heat exchange stations. The water supply regulating valves are connected to the controller, and the controller is used to adjust the opening degree of the water supply regulating valves.

5. The heating system according to claim 1, characterized in that, It further includes a primary network supply water temperature sensor which is located on the primary network supply water pipe and is used to collect the supply water temperature of the primary pipe network.

6. The heating system according to claim 1, characterized in that It further includes a primary network return water temperature sensor which is located on the primary network return water pipe and is used to collect the return water temperature of the primary pipe network.

7. The heating system according to claim 1, characterized in that, It further includes a first flow sensor which is located on the primary network supply water pipe and is used to collect the supply water flow of the primary pipe network.

8. The heating system according to claim 1, characterized in that, It further includes a second flow sensor which is located on the primary network return water pipe and is used to collect the return water flow of the primary pipe network.

9. The heating system according to claim 1, characterized in that, It further includes a secondary network supply water pipe and a secondary network return water pipe; The heat exchange stations are connected to multiple heat users through the secondary network supply water pipe and the secondary network return water pipe.

10. The heating system according to claim 1, characterized in that, The controller is further connected to a display screen for displaying the differential pressure.

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