Energy-saving heating unit

Abstract

The utility model discloses an energy-saving heating unit, which belongs to the technical field of heating units and comprises a control system, a heat exchanger, a circulating pump set and a water mixing pump set. The heat exchanger is provided with a hot water pipeline and a cold water pipeline which are mutually independent, one end of the hot water pipeline extends out of the heat exchanger to form a water inlet pipeline connected with the primary side water inlet, and the other end of the hot water pipeline extends out of the heat exchanger to form a water outlet pipeline connected with the primary side water outlet; one end of the cold water pipeline extends out of the heat exchanger to form a water supply pipeline connected with a secondary side water supply port, and the other end of the cold water pipeline extends out of the heat exchanger to form a water return pipeline connected with a secondary side water return port; the water supply pipeline is connected with a circulating pump set; the water return pipeline is connected with a water mixing pump set. A heating unit is combined with a water mixing unit, so that the resistance of the heating unit is effectively reduced, the lift and power of a circulating pump are reduced, the energy consumption is greatly reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating units, and in particular relates to an energy-saving heating unit. Background Art

[0002] Existing heating equipment includes heating units and water mixing units. The heating unit consists of a heat exchanger, a circulation pump control system, and a constant pressure feed water pump control system. The working principle is that the heat source on the primary side transfers heat to the secondary side through the heat exchanger, and the hot water on the secondary side is sent to the user end through the circulation pump control system. The primary and secondary sides operate separately and do not affect each other. Among them, the circulation pump control system generally uses a return water circulation pump. The return water circulation pump needs to overcome the resistance of both the internal resistance of the heat exchanger and the resistance of the external pipe network. The head is relatively high. In addition, the entire flow of the return water circulation pump must pass through the heat exchanger. This leads to the following disadvantages of the heating unit:

[0003] 1. The return water circulation pump has high head, high power consumption and high operating cost;

[0004] 2. The plate heat exchanger has a large pressure drop, and the large area resistance factor makes the heat exchange efficiency low;

[0005] 3. The heat exchange area is large, the heat exchanger occupies a large space, and the equipment and land investment are high.

[0006] The working principle of a water mixing unit is: a certain amount of water is continuously input from the primary side to the secondary side. This water is mixed with the secondary side return water to reach the user's required temperature. Then, an equal amount of water is output from the secondary side return water or water supply to the primary side to maintain the pressure balance on the secondary side. Due to the mixed flow between the primary and secondary sides, the water mixing unit has the following disadvantages:

[0007] 1. Cross-contamination of water quality between the primary and secondary sides increases the difficulty of water treatment and the investment in equipment and site;

[0008] 2. Increased loss of primary side heat source, increasing the load on the primary side boiler water supply system;

[0009] 3. It destroys the pressure balance of the primary side pipe network and affects the normal use of heat sources in other heat exchange stations. Utility Model Content

[0010] In order to solve the above technical problems, the technical solution of the utility model is: an energy-saving heating unit, including a control system, a heat exchanger, a circulation pump group and a mixing water pump group;

[0011] The heat exchanger has independent hot water and cold water pipes. One end of the hot water pipe extends out of the heat exchanger to form an inlet pipe connected to the primary water inlet, and the other end of the hot water pipe extends out of the heat exchanger to form an outlet pipe connected to the primary water outlet.

[0012] One end of the cold water pipeline extends out of the heat exchanger to form a water supply pipeline connected to the secondary side water supply port, and the other end of the cold water pipeline extends out of the heat exchanger to form a return water pipeline connected to the secondary side return water port;

[0013] The water supply pipeline is connected to a circulation pump group;

[0014] The return water pipeline is connected with a water mixing pump group.

[0015] Specifically, the water mixing pump group is composed of two variable frequency water mixing pumps connected in parallel.

[0016] Specifically, the circulation pump group is composed of two variable frequency circulation pumps connected in parallel.

[0017] Specifically, a temperature control valve group is provided on the water inlet pipeline.

[0018] Specifically, a water collector connected in series with the circulation pump group is connected to the water supply pipeline, and the water outlet end of the water collector is connected to the water inlet end of the circulation pump group.

[0019] Specifically, a static balancing valve is connected in series on the water supply pipeline between the heat exchanger and the water collector.

[0020] Specifically, the return water pipeline is connected to a water supply pipeline, one end of the water supply pipeline is connected to a water supply inlet, and the other end is connected to the water inlet end of the mixing water pump group, and the water supply pipeline is connected to the water supply pump group.

[0021] Specifically, the water collector is connected to the return water pipeline between the water mixing pump group and the water supply pipeline through a water collection pipeline.

[0022] Specifically, a second temperature transmitter and a third pressure transmitter are provided on the water supply pipeline between the secondary side water supply port and the circulation pump group, a first temperature transmitter and a first pressure transmitter are provided on the return water pipeline between the secondary side return water port and the make-up water pipeline, and a second pressure transmitter is provided on the return water pipeline between the heat exchanger and the mixing water pump group.

[0023] Specifically, the control system includes a PLC controller, which acquires data and uploads the data to a cloud server for editing and processing; wherein, the data collected by the PLC controller is provided by a circulation pump group, a mixing pump group, a temperature control valve group, a water supply pump group, a second temperature transmitter, a third pressure transmitter, a first temperature transmitter, a first pressure transmitter and a second pressure transmitter.

[0024] The technical solution provided by the utility model has the following advantages compared with the existing technology:

[0025] 1. The heating unit is combined with the water mixing unit, which effectively reduces the network resistance in the heating unit and the network resistance outside, reduces the circulating pump head and power, greatly reduces the energy consumption, and greatly reduces the operation cost;

[0026] 2. The double-layer power is adopted, which eliminates the influence of the heat exchanger scale on the external network system, greatly guarantees the stability and comfort of heating;

[0027] 3. The primary side pipeline and the secondary side pipeline are independent of each other, which avoids the cross contamination of water in the primary side pipeline and the secondary side pipeline, ensures the pressure balance of the primary side pipeline and the secondary side pipeline, and avoids the heat loss of hot water in the primary side pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the system flow chart of the energy-saving heating unit in the embodiment;

[0029] As shown in the drawings:

[0030] 1. Heat exchanger; 2. Temperature control valve group; 3. Water mixing pump group; 4. Static balance valve; 5. Water collector; 6. Circulating pump group; 7. Water supplement pump group; 81. First temperature transmitter; 82. Second temperature transmitter; 91. First pressure transmitter; 92. Second pressure transmitter; 93. Third pressure transmitter; 10. Control system; 11. Primary side water inlet; 12. Primary side water outlet; 13. Secondary side water supply port; 14. Water supplement inlet; 15. Secondary side return port; 16. Hot water pipeline; 17. Cold water pipeline; 18. Water inlet pipeline; 19. Water outlet pipeline; 20. Water supply pipeline; 21. Return pipeline; 22. Water supplement pipeline. DETAILED DESCRIPTION

[0031] In order to facilitate understanding, the energy-saving heating unit will be described below in conjunction with the embodiments, and it should be understood that these embodiments are only used to illustrate the utility model and not used to limit the scope of the utility model.

[0032] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] like Figure 1 As shown, an energy-saving heating unit includes a control system 10, a heat exchanger 1, a temperature control valve assembly 2, a water collector 5, a circulation pump assembly 6, a mixing pump assembly 3, and a make-up water pump assembly 7. The heat exchanger 1 has independent hot water and cold water lines 16 and 17. One end of the hot water line 16 extends from the heat exchanger 1 to form an inlet line 18 connected to the primary water inlet 11. The other end of the hot water line 16 extends from the heat exchanger 1 to form an outlet line 19 connected to the primary water outlet 12. The primary water inlet 11 and / or the primary water outlet 12 are connected to municipal hot water or steam. Municipal hot water or steam flows from the primary water inlet 11 into the inlet line 18, then flows sequentially through the hot water line 16 and the outlet line 19 within the heat exchanger 1 before exiting the primary water outlet 12. As the municipal hot water or steam passes through the hot water line 16, its heat is exchanged with the cold water line 17 within the heat exchanger 1.

[0035] Continue as Figure 1 As shown, a temperature-controlled valve assembly 2 is installed on the water inlet pipe 18. This valve assembly 2 consists of four components connected in series, including at least one valve and a temperature transmitter. The temperature-controlled valve assembly 2 collects signals from the temperature transmitter. After data analysis and calculation by the control system 10, the valve opening is adjusted to regulate the amount of municipal heat or steam used.

[0036] Continue as Figure 1As shown, one end of the cold water pipeline 17 extends out of the heat exchanger 1 to form a water supply pipeline 20 connected to the secondary water supply port 13. The other end of the cold water pipeline 17 extends out of the heat exchanger 1 to form a return water pipeline 21 connected to the secondary water return port 15. From the secondary water return port 15 to the water inlet of the cold water pipeline 17, the return water pipeline 21 is connected in series with the first pressure transmitter 91, the first temperature transmitter 81, the mixing water pump unit 3, and the second pressure transmitter 92. The return water pipeline 21 between the mixing water pump unit 3 and the first temperature transmitter 81 is connected to the make-up water pipeline 22. One end of the make-up water pipeline 22 is connected to the make-up water inlet 14, and the other end is connected to the water inlet of the mixing water pump unit 3. The make-up water pipeline 22 is also connected to the make-up water pump unit 7. From the outlet of cold water pipeline 17 to secondary water supply port 13, water supply pipeline 20 is connected in series with static balancing valve 4, water collector 5, circulation pump unit 6, second temperature transmitter 82, and third pressure transmitter 93. Water collector 5 is connected to return water pipeline 21 between mixing pump unit 3 and water supply pipeline 22 via a water collection pipeline.

[0037] Continue as Figure 1 As shown, the mixing water pump group 3 is composed of two variable frequency mixing water pumps connected in parallel. An air pressure tank is installed on the return water pipe 21 at the water inlet end of the mixing water pump group 3. The mixing water pump group 3 realizes the inlet pressure control of the heat exchanger 1 to ensure that the resistance of the heat exchanger 1 and the connecting valves are overcome. While ensuring that the water flow, temperature and pressure output from the secondary side water supply port 13 meet the user's needs, the mixing water pump group 3 is used to reduce the water flow that needs to be circulated and heated, and also reduces the resistance of the heat exchanger 1, improves the heat transfer coefficient, and relatively reduces the investment cost and equipment space occupied by the heat exchanger 1. The make-up water pump group 7 is composed of two variable frequency make-up water pumps connected in parallel. The circulation pump group 6 is composed of two variable frequency circulation pumps connected in parallel. The circulation pump group 6 realizes water supply pressure control to ensure the water supply pressure at the most unfavorable point of the system, thereby ensuring normal heating at the most unfavorable point. By overcoming the resistance of the external network, the lift is greatly reduced, and the pump power is also greatly reduced, which not only greatly reduces the power consumption of the heating unit, but also reduces the investment in circulating pump equipment. At the same time, when the heat exchanger 1 is scaled, it will not affect the external network. The water volume, water temperature and water pressure output from the secondary side water supply port 13 are more stable, which increases the user's water comfort.

[0038] Continue as Figure 1 As shown, user return water is divided into two paths: one path enters the return water pipeline 21 from the secondary return water port 15, and the other path enters the return water pipeline 21 from the water supply inlet 14. The water in the return water pipeline 21 flows through the mixing water pump unit 3, is pressurized by the mixing water pump unit 3, and then enters the cold water pipeline 17 inside the heat exchanger 1. After being heated by the municipal heat source in the hot water pipeline 16 inside the heat exchanger 1, the cold water pipeline 17 flows out of the heat exchanger 1, passes through the static balancing valve 4, enters the water collector 5, and then flows out of the water collector 5, enters the circulation pump unit 6, and is pressurized by the circulation pump unit 6 and flows out of the secondary water supply port 13 to be supplied to the user.

[0039] Continue as Figure 1 As shown, the primary piping system is comprised of an inlet pipe 18, a hot water pipe 16, and an outlet pipe 19, while the secondary piping system is comprised of a return pipe 21, a makeup pipe 22, a cold water pipe 17, and a supply pipe 20. In this embodiment, the primary and secondary piping systems are independent of each other, preventing cross-contamination of water within the primary and secondary pipes, ensuring pressure balance between the primary and secondary pipes, and minimizing heat loss from the hot water within the primary pipe.

[0040] Continue as Figure 1 As shown, the control system 10 includes a PLC controller, which collects data and uploads it to a cloud server for editing and processing. The cloud server then analyzes the data and makes predictions. The data collected by the PLC controller is provided by the circulation pump group 6, the mixing pump group 3, the temperature control valve group 2, the make-up pump group 7, the second temperature transmitter 82, the third pressure transmitter 93, the first temperature transmitter 81, the first pressure transmitter 91, and the second pressure transmitter 92. The third pressure transmitter 93, the first pressure transmitter 91, and the second pressure transmitter 92 collect pressure signals and transmit them to the control system 10. Through data analysis and calculation, the control system 10 controls the motor frequency and speed of the make-up pump group 7, the mixing pump group 3, and the circulation pump group 6. When the secondary side pipeline is short of water, the first pressure transmitter 91 detects a drop in water pressure in the return line 21, and the make-up pump group 7 automatically starts replenishing water. The mixing pump group 3, circulation pump group 6, make-up pump group 7 and temperature control valve group 2 are controlled in time and peak-shaving mode to ensure heating supply during peak heating periods, maintain low power consumption and energy consumption during low heating periods, reduce heat and electricity consumption, improve energy utilization and reduce operating costs.

[0041] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some or all of the technical features therein may be replaced with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of the present invention.

Claims

1. An energy-saving heating unit, characterized in that: Including control system, heat exchanger, circulation pump group and mixing water pump group; The heat exchanger has independent hot water and cold water pipes. One end of the hot water pipe extends out of the heat exchanger to form an inlet pipe connected to the primary water inlet, and the other end of the hot water pipe extends out of the heat exchanger to form an outlet pipe connected to the primary water outlet. One end of the cold water pipeline extends out of the heat exchanger to form a water supply pipeline connected to the secondary side water supply port, and the other end of the cold water pipeline extends out of the heat exchanger to form a return water pipeline connected to the secondary side return water port; The water supply pipeline is connected to a circulation pump group; The return water pipeline is connected with a water mixing pump group.

2. The energy-saving heating unit according to claim 1, characterized in that: The water mixing pump group is composed of two variable frequency water mixing pumps connected in parallel.

3. The energy-saving heating unit according to claim 1, characterized in that: The circulating pump group is composed of two variable frequency circulating pumps connected in parallel.

4. The energy-saving heating unit according to claim 1, characterized in that: A temperature control valve group is provided on the water inlet pipeline.

5. The energy-saving heating unit according to claim 4, characterized in that: The water supply pipeline is connected to a water collector connected in series with the circulation pump group, and the water outlet end of the water collector is connected to the water inlet end of the circulation pump group.

6. The energy-saving heating unit according to claim 5, characterized in that: A static balancing valve is connected in series on the water supply pipeline between the heat exchanger and the water collector.

7. The energy-saving heating unit according to claim 5, characterized in that: The return water pipeline is connected to the water supply pipeline, one end of the water supply pipeline is connected to the water supply inlet, and the other end is connected to the water inlet end of the mixing water pump group, and the water supply pipeline is connected to the water supply pump group.

8. The energy-saving heating unit according to claim 7, characterized in that: The water collector is connected to the return water pipeline between the mixing water pump group and the water supply pipeline through a water collection pipeline.

9. The energy-saving heating unit according to claim 7, characterized in that: A second temperature transmitter and a third pressure transmitter are provided on the water supply pipeline between the secondary side water supply port and the circulation pump group, a first temperature transmitter and a first pressure transmitter are provided on the return water pipeline between the secondary side return water port and the make-up water pipeline, and a second pressure transmitter is provided on the return water pipeline between the heat exchanger and the mixing water pump group.

10. The energy-saving heating unit according to claim 9, characterized in that: The control system includes a PLC controller, which acquires data and uploads the data to a cloud server for editing and processing; wherein the data collected by the PLC controller is provided by a circulation pump group, a mixing pump group, a temperature control valve group, a water supply pump group, a second temperature transmitter, a third pressure transmitter, a first temperature transmitter, a first pressure transmitter and a second pressure transmitter.

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