RU2809887C1 - Pumping and mixing unit for low temperature heating system - Google Patents

Abstract

FIELD: heating systems.

SUBSTANCE: invention relates to pumping and mixing units of a low-temperature heating system for changing heat transfer (temperature regime of the coolant), increasing or decreasing it, and is intended to provide comfortable and economical heat supply for both the entire building and individual blocks of premises, namely for the “warm floor” system. The technical problems to be solved by the invention are to increase the reliability of the pumping and mixing unit, to provide the possibility of distributing the collectors and pumping and mixing unit of the low-temperature heating system to different places, as well as to simplify the repairability of the pumping and mixing unit of the low-temperature heating system. The technical result of the invention is achieved due to the fact that the pumping and mixing unit of a low-temperature heating system has a circulation pump that combines, through the circulation pipes, a supply section combined with the supply pipe and a mixing section combined with the return pipe, while the pumping and mixing unit communicates with high-temperature line through the supply control valve and the return control valve, each of which is equipped with a drive having a temperature sensor, the supply control valve is located in the mixing area near the circulation pipe, the check valve is located in the mixing section, between the circulation pipe and the return pipe. What is new is that one of the temperature sensors is located between the circulation pipe of the mixing area and the coolant return pipe of the low-temperature heating system.

EFFECT: increasing the reliability of the pumping and mixing unit, providing the possibility of distributing the collectors and pumping and mixing unit of the low-temperature heating system to different places, as well as to simplifying the repairability of the pumping and mixing unit of the low-temperature heating system.

1 cl, 2 dwg

Description

The invention relates to pumping and mixing units of a low-temperature heating system for changing heat transfer (temperature regime of the coolant), increasing or decreasing it, and is intended to provide comfortable and economical heat supply for both the entire building and individual blocks of premises, namely for the “warm floor” system .

Underfloor heating is a type of low temperature heating system. For a number of reasons, the coolant must be supplied to the pipelines at a temperature below 55°C. It is the pumping and mixing unit that ensures that the temperature of the coolant is maintained at the values required for low-temperature heating by mixing two flows - hot (from the high-temperature main of the heating system) and cooled (from the return main after passing through the low-temperature heating system, for example, “warm floor”) .

The heated floor pumping and mixing unit is the most important component of the system. It not only ensures the circulation of the coolant through the circuits and maintains the required coolant temperature in them, but also provides integration with the collectors, through which the coolant is distributed along the circuits of the heated floor, collected back into the collectors and returned to the control unit. The correct layout of the pumping and mixing unit affects the functionality and reliability of the entire heating system.

A known manifold with an integrated mixing unit, consisting of supply and return parts, including supply and return pipelines, micrometric valves, balancing valves, fill and drain valves, air release valves, connecting connectors and thermometers, characterized in that it is equipped with a built-in mixing unit , including an additional manual air release valve, a circulation pump, a bypass line with a balancing valve, an inlet two-way (control) valve, and an outlet balancing valve. (Patent No. 59789, IPC F28F 13/00, published 12/27/2006).

The disadvantage of this design is the inability to separate the pumping and mixing unit and the manifold to different installation locations. When heating buildings with several floors or blocks of premises, individual collector groups are installed, and the coolant is prepared by one pumping and mixing unit.

Insufficient reliability of a pumping and mixing unit with one temperature sensor, if which fails, coolant with a temperature higher than the permissible one can enter the heated floor circuits. And if the failure of the temperature sensor coincides with a stop of the circulation pump, this will lead to an inevitable increase in the temperature of the coolant supplied to the heated floor circuits, which may even lead to the destruction of the heated floor screed.

The closest in technical essence is the RTL-controlled pumping and mixing unit TA NSU PN, the description of which is on the Internet at: https://tsgvps.ru/opisaniva/opisanie-termoadaptivnve-pogodozavisimye-nasosno-smesitelnye-uzlov/, which is accepted for the prototype.

A pumping and mixing unit of a low-temperature heating system, having a circulation pump that combines, through circulation pipes, a supply section combined with a supply pipe and a mixing section combined with a return pipe, while the control unit is connected to the high-temperature main through a supply control valve and a return control valve, each of which is equipped with a drive having a temperature sensor, the supply control valve is located in the mixing area at the circulation pipe, the check valve is located in the mixing area, between the circulation pipe and the return pipe, the return control valve is located in the mixing area, between the check valve and the coolant return pipe of the low-temperature system heating.

The disadvantage of this pumping and mixing unit of the low-temperature heating system is:

1. Insufficient operational reliability due to the fact that the entire low-temperature heating system is controlled by temperature sensors located on one heated floor circuit. If the circulation of the coolant through this circuit is stopped, for example, if an air lock forms in it or if this heated floor circuit is turned off in the event of a violation of its tightness, the control of the entire system connected to this control unit is disrupted.

2. Complicated repairs due to the fact that the temperature sensors of the drives used in this pumping and mixing unit are installed between the pipe of the heated floor circuit and the collector, and in the event of failure of the drive with the temperature sensor and their replacement, it is necessary to disconnect this circuit from the system and merge it with part of the coolant circuit, dismantle the sensor, disassemble the connections and repeat all operations in the reverse order, which requires special knowledge, skills and experience.

3. the impossibility of separating the pumping and mixing unit of the system and distribution manifolds into different locations, floors or blocks.

The technical problems to be solved by the invention are to increase the reliability of the pumping and mixing unit, to provide the possibility of distributing the collectors and pumping and mixing unit of the low-temperature heating system to different places, as well as to simplify the repairability of the pumping and mixing unit of the low-temperature heating system.

Technical objectives are achieved due to the fact that the pumping and mixing unit of a low-temperature heating system has a circulation pump that combines, through circulation pipes, a supply section combined with the supply pipe and a mixing section combined with the return pipe, while the pumping and mixing unit is connected to the high-temperature main through a supply control valve and a return control valve, each of which is equipped with a drive having a temperature sensor, the supply control valve is located in the mixing area near the circulation pipe, the check valve is located in the mixing area, between the circulation pipe and the return pipe, the return control valve is located in the admixture, between the check valve and the return pipe, according to the invention, one of the temperature sensors is placed in the mixture area, between the circulation pipe and the coolant return pipe of the low-temperature heating system.

To illustrate the essence of the invention, the following drawings are provided: Fig. 1 - general view of the pumping and mixing unit of the low-temperature heating system.

Fig. 2 - diagram of the operation of the pumping and mixing unit of the low-temperature heating system.

The pumping and mixing unit includes:

1 - circulation pump

2 - circulation pipe

3 - supply section

4 - supply pipe

5 - mixing area

6 - return pipe

7 - supply control valve

8 - supply valve drive

9 - temperature sensor for return of circulating coolant

10 - return control valve

11 - return valve drive

12 - temperature sensor for circulating coolant supply

13 - check valve

14 - circulating coolant distribution manifold

15 - manifold for combining the circulating coolant

16 - heated floor contours

17 - protective sleeve

T1 - supply from a high-temperature main

T2 - return to the high-temperature main

T3 - supply of low-temperature coolant

T4 - return of low-temperature coolant

A special case of the implementation of a pumping and mixing unit of a low-temperature heating system according to the invention. See FIG. 1.

For the pumping and mixing unit of the low-temperature heating system, mass-produced products were used, which are sold under the name indicated in quotation marks.

“Connections for pump Art. 249 KVD” - 1 set, which contains: supply section 3 combined with supply pipe 4 and mixing section 5 combined with return pipe 6. At supply section 3 and mixing section 5 there are circulation pipes 2, and Near the supply pipes 4 and return 6 there are pipes with a 1/2 internal thread, perpendicular to the axis of the mixing area. The supply pipes 4 and return 6 have 1" external threads. At the ends of the supply 3 and mixing sections 5 there are 1" internal threads. In the mixing section 5 there are pipes with internal threads 1", perpendicular to the axis of the mixing section, and a return valve 13 is built between them. In the upper part of the circulation pipe 2 of the supply section 3 there is a hole with an internal thread V2". Circulation pump 1 “AM-XPS25-6-130” - 1 pc. protective sleeves 17 "189 | Fitting for remote thermostatic head sensor code 87189AD06" - 2 pcs. Control valves 7 and 10 - “N/N thermostatic valve with detachable THERMO connection article 162N2300” - 2 pcs. Drives 8 and I with temperature sensor 9 and 12 - “Thermostatic head 20°-50°C with immersion sensor art.995/82995AC20” - 2 pcs. Adapters “Plug with o-ring 1/2 g * 1" w, nickel-plated article number M302-24” - 2 pcs and plugs “Plug with o-ring, brass 1" article DT004A” - 2 pcs, “Plug with o-ring, brass V2 "article DT002A" - 1 pc.

Execution of the pumping and mixing unit of the system

low temperature heating according to the invention. See fig. 1.

To the circulation pipes 2 of the supply section 3 and the mixing section 5 with union nuts IV2" through sealing gaskets (from the pump kit), a circulation pump 1 is connected, located in the direction of the arrow on its body, from the mixing section to the supply section. In the threaded holes at the ends of the supply sections 3 and mixture 5, plugs 1" “Plug with o-ring, brass 1" article number DT004A are screwed into the threaded hole V2" of the upper part of the circulation pipe 2 of the supply section 3.

Into the nozzles with internal thread 1", located perpendicular to the axis of the mixing area 5, adapters are screwed into the fitting with an o-ring 1/2 g * 1" w, nickel-plated article MZ02-24" with internal thread V2", into which detachable connections of THERMO thermostatic valves are screwed article 162N2300. Protective sleeves 17 are screwed into the 1/2" internal threaded pipes located near the supply pipes 4 and return 6.

A supply control valve 7 is connected to the detachable connection installed in the mixing area 5 near the circulation pipe, and the arrow on the control valve body is directed to the mixing unit. A return control valve 10 is attached to the detachable connection installed in the mixing area 5 between the check valve 13 and the return pipe, and the arrow on the control valve body is directed away from the mixing unit.

The supply control valve 7 is equipped with a drive 8, a temperature sensor 12 of which is located in a protective sleeve 17, which in turn is located in the supply section 3, between the circulation pipe 2 and the supply pipe 4. The return control valve 10 is equipped with a drive 11, a temperature sensor 9 of which is located in the sleeve protective 17, which in turn is located in the mixing area 5 between the circulation pipe 2 and the return pipe 6.

In fact, the temperature sensor 12 can be installed on the circulation pump 1, and on the circulation pipe 2 of the supply section 3, and on the supply section 3 itself, and on the supply pipe 4, and on the distribution manifold 14 of the circulating coolant. All connections are tightened using wrenches. Tightness is ensured by elastic sealing elements. The structure is ready for use.

The inventive pumping and mixing unit for a low-temperature heating system is based on the principle of sequential mixing of coolants. The coolant circulating through the heated floor circuits is mixed with a high-temperature coolant supplied from the high-temperature main and returning after passing through the heated floor circuits to the high-temperature main with the same instantaneous flow rate. The flow rate of the high-temperature coolant through the pumping and mixing unit is no more than the flow rate passing through the less open control valve, due to the fact that the valves are located on the supply and return lines of the same line. When the circulation pump is running, the temperature of the coolant returning to the high-temperature main is equal to the temperature of the coolant returning from the heated floor circuits.

In fig. Figure 2 shows a diagram of the operation of the pumping and mixing unit of a low-temperature heating system, explaining the principle of operation of the invention in a particular case.

There are no automatic flow regulators on the heated floor circuits, and when the circulation pump is running, the coolant flow through the heated floor circuits is conditionally constant. The throughput of control valves is significantly less than the throughput of underfloor heating circuits.

The supply of the high-temperature line T1 communicates through the supply control valve 7 with the mixing area 5 near the circulation pipe. The supply valve drive 8, which has a temperature sensor 12, is set to 45°C. The return to the high-temperature line T2 is communicated through the return control valve 10 with the mixing section 5 in the area between the check valve 13 and the return pipe 6. On the drive 11, which has a temperature sensor 9, the value is set to 30°C. The supply section 3 communicates through the supply pipe 4 with the distribution manifold of the circulating coolant 14, and the mixing section 5 communicates through the return pipe 6 with the manifold 15 for combining the circulating coolant. The underfloor heating circuits are connected to collectors 14 and 15.

When the circulation pump 1 is turned on, the coolant T1 through the supply control valve 7 enters the circulation pipe 2, located in the mixing area 5. The coolant from the heated floor circuits 16 through the circulation coolant pool manifold 15 and through the coolant return pipe 6 enters the mixing section 5.

In the mixing area 5 there is a check valve 13, which ensures the return of the low-temperature coolant T4 to the circulation pipe 2, but does not allow the supply coolant from the high-temperature line T1 to enter the heated floor circuits 16 from the side of the coolant return pipe 6, if the circulation pump 1 stops working. Coolants T1 and T4 are combined in the mixing pipe 2, mixed in the circulation pump 1 and supplied to the supply section 3. Through the supply pipe 4, the coolant T3 enters the distribution manifold 14 of the circulating coolant at the input of the heated floor circuits 16. As the coolant passes through the heated floor circuits , giving off heat to the premises, the temperature of the coolant decreases. Having united in the collector 15, the coolant T4 enters through the return pipe 6 into the mixing section 5. Part of the coolant returned from the heated floor circuits 16, equal to the amount of coolant received from the high-temperature line T1, returns through the return control valve 10 to the high-temperature line T2, and part of the coolant T4 enters through the check valve 13 into the circulation pipe 2 of the mixing section 5, where, as necessary, coolant is added to it from the supply from the high-temperature line T1, entering through the supply control valve 7.

Each control valve, equipped with an actuator with a temperature sensor, operates as an autonomous proportional coolant flow controller depending on the temperature of the temperature sensor. When the temperature of the temperature sensor increases, the actuator acts on the control valve, reducing the throughput of this valve. When the temperature of the temperature sensor decreases, the drive acts on the control valve, increasing the throughput of this valve.

If the supply temperature of the low-temperature coolant T3 exceeds the value set on the return valve drive 8, the supply control valve 7 closes; if the above temperature is lower than the value in the particular case of 45°C, then the supply control valve 7 opens.

Thus, the supply control valve 7, equipped with a drive 8 having a temperature sensor 12, ensures the supply temperature of the low-temperature coolant T3 is not higher than the value set on the drive 8.

If the return temperature of the low-temperature coolant T4 exceeds the value set on the return valve actuator 11, the supply control valve 10 closes, if the above temperature is lower than the value in the particular case of 30°C, then the supply control valve 10 opens.

Thus, the return control valve 10, equipped with a drive 11 having a temperature sensor 9, ensures the return temperature of the low-temperature coolant T4 at the level of the value set on the drive 11.

Features of a particular case of implementation of the invention include the following advantages:

1. When one or more underfloor heating circuits are turned off, the control of the low-temperature heating system is not disrupted, since the entire system is controlled according to the supply temperatures T3 and return temperatures T4 of the low-temperature coolant coming from all operating underfloor heating circuits 16.

2. When the drive 11 of the return valve 10 is turned off or fails, the pumping and mixing unit continues to control the low-temperature heating system, maintaining a constant supply temperature of the low-temperature coolant T3 at the value set on the drive 8 of the supply valve 7.

3. When the supply valve drive 8 is turned off or fails, the pumping and mixing unit continues to control the low-temperature heating system, maintaining a constant return temperature of the low-temperature coolant T4 at the value set on the drive 11 of the return valve 10.

4. If the supply valve drive 8 is installed on the return valve 10, and the return valve drive 11 is installed on the supply valve 7, the pumping and mixing unit operates in normal mode.

The above advantages remain even if the pumping and mixing unit and the collectors 14 and 15 are located in different places and communicate with each other through pipelines.

The applicant has produced a prototype of a pumping and mixing unit for a low-temperature heating system, which indicates the feasibility of the invention.

Experimental tests confirmed the possibility of achieving the set objectives: increasing the reliability of the pumping and mixing unit, ensuring the possibility of distributing collectors and the pumping and mixing unit of the low-temperature heating system to different places, as well as simplifying the repairability of the pumping and mixing unit of the low-temperature heating system.

The analysis of the state of the art carried out by the applicant made it possible to establish that there are no analogues characterized by sets of features identical to all the features of the claimed pumping and mixing unit for a low-temperature heating system. Consequently, the claimed technical solution meets the patentability condition of “novelty”. The results of a search for known solutions in this field of technology in order to identify features that coincide with the features of the proposed technical solution that are distinctive from the closest analogue, showed that they do not follow explicitly from the prior art. The prior art determined by the applicant does not reveal the impact of the transformations provided for by the essential features of the proposed technical solution on achieving the specified technical result. Consequently, the claimed technical solution meets the patentability condition of “inventive step”.

The listed features distinguish the proposed technical solution from the prototype and determine the compliance of this solution with the requirements of the invention.

Claims (1)

A pumping and mixing unit of a low-temperature heating system, having a circulation pump that combines through circulation pipes a supply section combined with a supply pipe and a mixing section combined with a return pipe, while the pumping and mixing unit is connected to a high-temperature main through a supply control valve and a control valve return, each of which is equipped with a drive having a temperature sensor, a supply control valve is located in the mixing area near the circulation pipe, a check valve is located in the mixing area, between the circulation pipe and the return pipe, a return control valve is located in the mixing area, between the check valve and the return pipe , characterized in that one of the temperature sensors is located between the circulation pipe of the mixing area and the coolant return pipe of the low-temperature heating system.

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