High-rise building high-low area direct connection heating return water pressure isolator and system

Abstract

The invention discloses a high-rise building high-low area direct connection heating return water pressure isolator and system, the isolator is a cylindrical container with a top cover, the top cover of the cylindrical container is provided with a vent hole which is communicated with the atmosphere, the side wall of the cylindrical container is provided with a return water inlet, the inner cavity of the cylindrical container is provided with an inner return water pipe, and the inner return water pipe is communicated with the vent hole. The inner water return pipe penetrates out of the bottom of the cylindrical container and is communicated with the high-low area water return connecting pipe; a plurality of outflow holes are formed in the periphery of the inner water return pipe wall higher than the water return inlet. When in use, the isolator is connected in series on a high-area water return pipe of a high-rise building direct-connected central heating system, and a flow regulating valve is arranged on a high-area heating pipeline in front of the isolator. The isolator is simple in internal structure and easy to process and manufacture, and has good effects of high-low area pressure isolation, backwater circulation and pressure stabilization.

Description

Technical Field

[0001] The invention relates to the field of centralized heating, and in particular to a "direct connection" technology between high-rise building centralized heating systems and low-rise building centralized heating systems. Background Art

[0002] In order to solve the problem of system overpressure, the central heating system of high-rise buildings usually needs to be divided into high and low zones. The high and low zones of the central heating system of high-rise buildings usually adopt the following two measures: independent circulation system of high and low zones and "direct connection" system of high and low zones. The technology related to the present invention is the "direct connection" system of high and low zones.

[0003] In the traditional "direct connection" system between high- and low-zones, the high- and low-zones usually use the same set of heating units, circulating main pumps and water replenishment constant pressure devices; the constant pressure value of the water replenishment constant pressure device is determined according to the pressure requirements of the low-zone heating system; a high-zone booster pump is installed on the water supply pipe leading to the high-zone to directly supply water to the high-zone heating system; a throttling or pressure reducing valve is installed on the high-zone return pipe at the connection with the low-zone return water to adjust the amount of circulating water in the high-zone and maintain the low-zone pressure moderate and relatively stable. The above-mentioned "direct connection" system between the high- and low-zones has the following problems: the throttling or pressure reducing valve installed on the high-zone return pipe can only play a role in reducing pressure under normal operating conditions of the system, and when the system is not in operation, the low-zone often still has a static pressure overpressure problem.

[0004] In order to solve the above problems, the utility model patent "Direct-connected heating return water pressure stabilizing device" with announcement number CN203177278U proposes a high and low zone return water pressure isolation device. The device consists of an inlet pipe, an outlet pipe, and an expansion chamber; the inlet pipe and the outlet pipe are coaxially arranged; the outlet pipe is inserted through the expansion chamber, and a conical end cap is fixedly installed on its upper end. The upper end of the expansion chamber is fixedly connected to an internally threaded casing with a spiral groove on the inner wall; the upper end of the casing is fixedly installed with an end cover, and the lower end is inserted in the upper chamber wall of the expansion chamber; a breathing tube is inserted on the upper end cover of the casing; a spiral groove is arranged on the wall of the outlet pipe, and a plurality of through holes are arranged on the wall of the outlet pipe located in the inner cavity of the expansion chamber and the inner cavity of the casing. When in use, the inlet pipe of the isolation device is connected to the high zone return pipe, and its outlet pipe is connected to the regional return pipe. After the high-area return water enters the water inlet pipe of the isolation device, it is broken up by the conical end cap. The scattered water flow impacts the inner wall of the casing, rotates and descends along the spiral groove on the inner wall of the casing and enters the expansion chamber. After the water level in the expansion chamber reaches a certain height, it enters the outlet pipe through the through hole on the outlet pipe, and finally enters the bottom return water system through the outlet pipe. The blocker used in this technical solution has the following main defects: (1) The internal structure is complex, such as the use of complex components and flow channels to increase resistance, the use of a more complex steam-water separation mechanism, and the manufacturing and processing are cumbersome; (2) The water inlet pipe is connected from the upper part of the isolator, and the return water passes through the narrow annular flow channel between the casing and the outlet pipe from top to bottom, which cuts off the normal airflow exchange channel between the expansion chamber, the outlet pipe and the breathing tube, destroying the normal pressure environment in the expansion chamber and the outlet water at the bottom of the isolator, resulting in poor water flow between the casing and the outlet pipe, causing the upper space of the casing to be full of water and the breathing tube to overflow. (3) A conical vent cap is installed on the top of the outlet pipe that runs through the expansion chamber, which aggravates the isolation effect of the normal airflow exchange channel between the expansion chamber, the outlet pipe and the breathing tube, thereby aggravating the water flow between the casing and the outlet pipe and the overflow of the breathing tube. (4) The non-full flow section of the outlet pipe at the bottom of the isolator is prone to air blockage and water flow problems when the flow rate is large. Summary of the invention

[0005] In order to overcome the problems of complex structure, poor internal and external airflow exchange, poor water flow in the outlet pipe section and air blockage in the above-mentioned high and low zone return water pressure isolation device, the present invention aims to invent a high-rise building high and low zone direct-connected heating return water pressure isolator with simple structure and better performance.

[0006] The present invention also provides a high-low zone direct-connected centralized heating system in which the isolator is installed.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A high-rise building high and low zone direct-connected heating return water pressure isolator, which is connected in series on the high zone return water pipe, and is characterized in that the isolator is a cylindrical container with a top cover, the top cover of the cylindrical container is provided with a vent connected to the atmosphere, a return water inlet is provided on the side wall of the cylindrical container, an inner return water pipe is provided in the inner cavity of the cylindrical container, the inner return water pipe passes through the bottom of the cylindrical container and is connected to the high and low zone return water connecting pipe; a plurality of outflow holes are provided around the inner return water pipe wall above the return water inlet.

[0009] The working principle is: high-level return water enters the cylindrical container from the return water inlet, and the water level rises slowly. When the water level reaches the outflow hole, the return water flows into the inner return water pipe from the outflow hole, and then enters the high and low area return water connecting pipe. The vents therein can ensure that the pressure inside the isolator is at normal pressure and realize the pressure isolation of the high and low areas, and is conducive to the uniform inflow and outflow of the high area return water.

[0010] Furthermore, in order to prevent the isolator from being filled with water and overflowing from the vent pipe, the total flow area of ​​the outflow holes should not be less than the cross-sectional area of ​​the water return inlet of the cylindrical container.

[0011] Furthermore, in order to ensure that the interior of the isolator is always at normal pressure and to avoid air blockage and poor water flow in the non-full flow section of the return water connecting pipe in the high and low zones at the bottom of the isolator, a vent pipe is provided in the inner return water pipe. The top end of the vent pipe extends from the vent on the top cover, and the bottom end of the vent pipe extends all the way to the full flow section of the return water connecting pipe in the high and low zones at the bottom of the inner return water pipe, and vent holes are evenly provided on the wall of the vent pipe.

[0012] The high-low zone return water pressure isolator of the present invention is used for a high-rise building direct-connected centralized heating system, which mainly includes a set of heating units shared by the high zone and the low zone, a circulating main pump and a water replenishment constant pressure device; it is characterized in that it also includes a high-rise building high-low zone direct-connected heating return water pressure isolator and a high zone booster pump connected in series to the high zone return water pipe, and the high zone booster pump directly supplies water to the high zone heating system.

[0013] Furthermore, in order to prevent the isolator from being installed too high and the non-full flow section of the high-low zone return water connecting pipe below the isolator from being too long, a flow regulating valve is installed on the high zone heating pipeline in front of the isolator.

[0014] Compared with the prior art, the positive effects of the present invention are:

[0015] 1. The existing high and low zone pressure isolators used in the "direct connection" system between the high zone and the low zone mainly achieve high and low zone pressure isolation through the complex internal structure of the isolator, and usually have problems such as poor water flow and overflow of the isolator. The isolator of the present invention has a simple internal structure, is easy to process and manufacture, and has good high and low zone pressure isolation, return water circulation and pressure stabilization effects.

[0016] 2. The existing high and low zone direct connection system using pressure isolators generally controls the high zone circulation flow by raising the installation position of the isolator, and the ability of automatically adjusting the flow according to load changes is poor. The present invention sets a flow regulating valve on the high zone heating pipeline in front of the isolator, which can automatically adjust the flow according to the change of heat load. On the one hand, it can greatly reduce the operating energy consumption of the high zone booster pump, and at the same time, it can greatly reduce the installation height of the isolator and reduce the length of the non-full pipe flow section at the isolator outlet, which is conducive to reducing the formation of air plugs, ensuring smooth water flow and reducing vibration and noise.

[0017] 3. The existing high and low zone direct connection system of the pressure isolator has the problems of air blockage and poor water flow in the non-full flow section, which are key issues affecting the normal operation of the isolator. The present invention provides a vent pipe in the isolator. Once there is pressure fluctuation in the non-full flow section inside the isolator and the lower outlet pipe, gas exchange will be carried out with the outside through the vent pipe to maintain the pressure stability of the non-full flow section of the high and low zone return water connecting pipe inside the isolator and the lower part, thereby effectively solving the problem of overflow of the isolator caused by air blockage and poor water flow in the non-full flow section.

[0018] 4. The height of the inner return water pipe of the isolator of the present invention is higher than the return water inlet, so that the high-zone return water entering the isolator rises first to separate gas and water, and then enters the inner return water pipe through the outlet hole of the inner return water pipe, which is beneficial to maintaining the pressure inside the isolator stable and preventing air from being carried by the water flow through the inner return water pipe and entering the non-full pipe flow section of the return water connecting pipe of the high and low zones at the bottom of the isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below. The drawings in the following description are only principle diagrams of an embodiment of the present invention. For ordinary technicians in this field, other similar drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a direct-connected heating return water pressure isolator for high and low zones of a high-rise building according to the present invention.

[0021] Figure 2 It is a schematic diagram of the configuration of an embodiment of a high and low zone direct-connected centralized heating system of the present invention.

[0022] In the figure: 1-vent, 2-top cover, 3-columnar container, 4-water inlet, 5-inner return pipe, 6-outlet, 7-non-full flow pipe section, 8-vent pipe, 9-vent, 10-full flow pipe section, 11-isolator, 12-flow regulating valve, 13-high zone booster pump, 14-circulation main pump. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0024] See also Figure 1 The embodiment of the high-rise building high-low zone direct heating return water pressure isolator of the present invention is a cylindrical container 3 (which can be cylindrical, square column, etc. in practice), the cylindrical container 3 is provided with a top cover 2, a water inlet 4 is opened on the side wall of the cylindrical container 3, an inner return water pipe 5 is provided in the inner cavity of the cylindrical container 3, the top of the inner return water pipe 5 is higher than the water inlet 4, the bottom of the inner return water pipe 5 passes through the bottom of the cylindrical container 3 and communicates with the high-low zone return water connection pipe, and the pipe wall of the inner return water pipe 5 higher than the water inlet 4 is evenly provided with outflow holes 6. In order to ensure that the pressure in the isolator 11 is normal pressure and realize the pressure isolation of the high and low zones, and to facilitate the uniform inflow and outflow of the high zone return water, a vent hole 1 is opened on the top cover 2 of the cylindrical container of the isolator 11. In order to prevent the cylindrical container 3 of the isolator from being filled with water and overflowing from the top cover vent hole 1, the total flow area of ​​the outflow hole 6 should not be less than the cross-sectional area of ​​the cylindrical container water inlet 4.

[0025] from Figure 1 It can be seen that a vent pipe 8 is provided in the inner water return pipe 5, the upper end of the vent pipe 8 extends from the vent hole 1, and the lower end of the vent pipe 8 extends all the way into the full flow pipe section 10 of the high-low area return water connecting pipe at the lower part of the inner water return pipe 5, and vent holes 9 are evenly provided on the pipe wall of the vent pipe 8. The purpose of providing the vent pipe 8 is to prevent the non-full flow pipe section 7 of the high-low area return water connecting pipe at the lower part of the inner water return pipe 5 from gas blockage, thereby causing poor return water outflow and causing a large fluctuation in the pressure in the pipe.

[0026] Figure 2 This is a central heating system with high and low zones directly connected, equipped with the isolator of the present invention. The figure also shows a household heating system and a non-household heating system. Figure 2 It can be seen that, whether it is a household heating system or a non-household heating system, the isolator 11 of the present invention is connected in series to the high-zone return pipe of the central heating system. During installation, the isolator water inlet 4 and the water outlet (that is, the bottom end of the return pipe 5 in the isolator) are connected to the high- and low-zone return connection pipes through flanges. Figure 2 It can also be seen that a flow regulating valve 12 is provided on the high-area heating pipeline in front of the isolator 11, and the flow regulating valve 12 should automatically adjust its opening according to the load change.

[0027] from Figure 2 It can also be seen that the high and low zones of the high-low zone direct-connected centralized heating system in which the isolator 11 of the present invention is installed share a set of heating units, a circulating main pump 14 and a water replenishment and constant pressure device, and also include a high zone booster pump 13, which directly supplies water to the high zone heating system.

[0028] It should be noted that:

[0029] If there are many and scattered high-rise buildings in the heating system service area that require zoned direct heating, the high-area booster pumps can be centrally installed in the heat exchange station; otherwise, they can be dispersedly installed near the high-rise buildings or building complexes that require zoned direct heating.

[0030] For high- and low-zone direct-connection systems with household heating, such as unit-type residential buildings with shared heating risers, the high-zone return pipe of each unit should share a set of isolators, and a common flow regulating valve can be set on the high-zone pipe before the isolator, or a flow regulating valve can be set for each user separately; for high-direct-connection systems with non-household heating using traditional heating methods, such as public buildings, a set of isolators should be set on the total return pipe of each high-zone system, and a common flow regulating valve can be set on the high-zone pipe before the isolator, or a flow regulating valve can be set on each high-zone return pipe separately; the flow regulating valve can use an electric regulating valve or a self-operated regulating valve that can automatically adjust the opening according to the return water temperature set value.

[0031] The above is only an embodiment of the present invention and is not intended to limit the technical solution of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-rise building high-low zone direct-connected heating return water pressure isolator, which is connected in series to the high zone return water pipe, characterized in that: The isolator is a cylindrical container with a top cover. The top cover of the cylindrical container is provided with a vent hole connected to the atmosphere. A return water inlet is provided on the side wall of the cylindrical container. An inner return water pipe is provided in the inner cavity of the cylindrical container. The inner return water pipe passes through the bottom of the cylindrical container and is connected to the high and low zone return water connecting pipe; a plurality of outflow holes are provided around the inner return water pipe wall above the return water inlet.

2. The high-rise building high-low zone direct-connected heating return water pressure isolator as claimed in claim 1, characterized in that: The total flow area of ​​the outflow holes should not be less than the cross-sectional area of ​​the water return inlet of the cylindrical container.

3. The high-rise building high-low zone direct-connected heating return water pressure isolator as claimed in claim 1, characterized in that: A vent pipe is arranged in the inner water return pipe, the top end of the vent pipe extends from the vent hole on the top cover, and the bottom end of the vent pipe extends all the way into the full flow pipe section of the high and low zone return water connecting pipe at the lower part of the inner water return pipe, and vent holes are evenly arranged on the wall of the vent pipe.

4. A high-rise building direct-connected central heating system equipped with the high- and low-zone direct-connected heating return water pressure isolator of claim 1, wherein the high-rise building direct-connected central heating system mainly comprises a set of heating units shared by the high zone and the low zone, a circulating main pump and a water replenishment constant pressure device; characterized in that: It also includes a high-rise building high and low-zone direct heating return water pressure isolator and a high-zone booster pump which are connected in series to the high-zone return water pipe, and the high-zone booster pump directly supplies water to the high-zone heating system.

5. The high-rise building direct-connected central heating system according to claim 4, characterized in that: A flow regulating valve is provided on the high-area heating pipeline in front of the isolator.

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