RU216586U1 - Pumping and mixing unit of the low-temperature heating system - Google Patents

Abstract

The utility model relates to pumping and mixing units of a low-temperature heating system for changing heat transfer (heat carrier temperature regime), increasing or decreasing it, and is designed to provide comfortable and economical heat supply for both the entire building and individual blocks of rooms, namely for the "warm floor" system .

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

The technical tasks are achieved due to the fact that the pumping and mixing unit of the low-temperature heating system, having a circulation pump, connecting through the circulation pipes the supply section, combined with the supply pipe and the mixing section, combined with the return pipe, while the pumping and mixing unit is connected to the high-temperature main 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 at the circulation pipe, the check valve is located in the mixing area, between the circulation pipe and the return pipe. What is new is that one of the temperature sensors is placed between the circulation pipe of the mixing section and the coolant return pipe of the low-temperature heating system. 2 ill.

Description

The utility model relates to pumping and mixing units of a low-temperature heating system for changing heat transfer (heat carrier temperature regime), increasing or decreasing it, and is designed to provide comfortable and economical heat supply for both the entire building and individual blocks of rooms, 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 maintains the temperature of the coolant at the values required for low-temperature heating by mixing two streams - hot (from the high-temperature main of the heating system) and cooled (from the return line after passing through the low-temperature heating system, for example, "warm floor") .

The underfloor heating pump 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 temperature of the coolant in them, but also provides integration with collectors through which the coolant is distributed along the contours of the warm 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.

Known manifold with an integrated mixing unit, consisting of supply and return parts, including supply and return pipelines, micrometer valves, balancing valves, filling and drain valves, air vent valves, docking 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 (regulating) 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 into different installation locations. When heating buildings with several floors or blocks of premises, individual collector groups are installed, and the heat carrier is prepared by one pump-mixing unit.

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

The closest in technical essence is the RTL-controlled pumping and mixing unit TA NSU PB, the description of which is available on the Internet at: https://tsgvps.ru/opisaniya/opisanie-termoadaptivnye-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 connects through the circulation nozzles a supply section combined with a supply pipe and an admixture section combined with a return pipe, while the pumping and mixing assembly is in communication with a high-temperature main line 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 disadvantage of this pumping and mixing unit of the low-temperature heating system is:

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

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

3. The impossibility of spacing the pumping and mixing unit of the system and distribution manifolds to different places, floors or blocks.

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

The technical tasks are achieved due to the fact that the pumping and mixing unit of the low-temperature heating system, having a circulation pump, connecting through the circulation pipes the supply section, combined with the supply pipe and the mixing section, combined with the return pipe, while the pumping and mixing unit is connected to the high-temperature main 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 at the circulation pipe, the check valve is located in the mixing area, between the circulation pipe and the return pipe, according to the utility model, one of the temperature sensors is placed between the circulation pipe of the mixing area and the coolant return pipe of the low-temperature heating system.

To clarify the essence of the utility model, drawings are given: Figure 1 - General view of the pumping and mixing unit of the low-temperature heating system.

Figure 2 is a 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 - feed section

4 - supply pipe

5 - mixing area

6 - return pipe

7 - supply control valve

8 - feed valve drive

9 - temperature sensor for the return of the circulating coolant

10 - return control valve

11 - return valve drive

12 - temperature sensor for supplying circulating coolant

13 - check valve

14 - circulating coolant distribution manifold

15 - collector of the circulating coolant union

16 - contours of the warm floor

17 - protective sleeve

T1 - supply from the high-temperature main

T2 - return to the high-temperature main

T3 - supply of low-temperature coolant

T4 - low-temperature coolant return

A special case of the implementation of the utility model (see figure 1).

For the pumping and mixing unit of the low-temperature heating system, parts that are freely available under the name indicated in quotation marks were used.

Circulation pump "AM-XPS25-6-130" - 1 pc. 1; "Kit for mounting a mixing group for underfloor heating, 1", Pump installation size: 1 1/2 ^inches article _M317-4 " - 1 kit, which contains circulation pipes 2, supply section 3, combined with supply pipe 4 and mixing section 5, combined with the return pipe 6. In the mixing section 5, between the return pipe 6 and the circulation pipe 2, there is a return valve 13. In the supply section 3 and the mixing section 5, the circulation pipe 2 has an internal thread 1 "in the end, into which the adapters are screwed" Futorka with o- _ring ^1/2 "d * 1" w, _nickel -plated article M302-24 "- 2 pcs, which have an external thread 1" and an internal thread ^1/2 ". When assembling the pumping and mixing unit, in a particular case, the following was removed from the above kit: immersion sleeve “Immersion sleeve for capillary (temperature sensor) ^1/2 "*130mm article M322-130" - 1 pc., "Thermometer " _small ", with sleeve, ^1/4 "(0°С - 80°С) article Y- 40T -80" -2 pcs _. and 2pcs. "Futorka NICKEL ¹ / ₂ w * ¹ / ₄ g article BX029N". Protective sleeves ¹⁷ "189 | Connection for remote sensor of _thermostatic head code 87189AD06" - 2 pcs. "- 2 pcs. Actuators 8 and 11 with temperature sensor 9 and 12 - "Thermostatic head 20°-50°C with immersion sensor art. 995/82995AC20" - 2 pcs.

Execution of the pumping and mixing unit of the low-temperature heating system (see figure 1).

Circulation pump 1 is connected to the circulation pipes 2 of the supply section 3 and the mixing section ₅ with union nuts 1 ^1/2 "through the seals (from the pump kit), located in the direction of the arrow on its body, from the mixing section to the supply section.

Detachable connections of control valves 7 and 10 are screwed into the adapters installed at the ends of the feeding and mixing sections. The supply control valve 7 is attached to the detachable connection installed at the end of the mixing section, 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 at the end of the supply section, and the arrow on the control valve body is directed away from the supply unit.

A drive 8 is installed on the supply control valve 7, the temperature sensor 9 of which is located in the protective sleeve 17, which in turn is located in the mixing area 5 between the circulation pipe 2 and the coolant return pipe 6.

On the return control valve 10, a drive 11 is installed, the temperature sensor 12 of which is located in the protective sleeve 17, which in turn is located in the supply section 3, between the circulation pipe 2 and the coolant supply pipe 4. In fact, the temperature sensor 12 can be installed on the circulation pump 1, so and on the circulation pipe 2 of the supply section 3, and on the supply section 3 itself, and on the return control valve 10, and on the coolant supply pipe 4, and on the circulating coolant distribution manifold 14. All connections are tightened with wrenches. Tightness is ensured by elastic sealing elements.

The structure is ready to go.

The inventive pumping and mixing unit of the low-temperature heating system is based on the principle of parallel mixing of heat carriers. To the heat carrier circulating through the contours of the warm floor, a high-temperature heat carrier is mixed, supplied from the high-temperature main and returning with the same instantaneous flow rate to the high-temperature main. The flow rate of the high-temperature coolant through the pump-mixing unit is not more than the flow rate passing through the less open control valve, due to the fact that they are located on the supply and return of the same line. When the circulation pump is running, the temperature of the coolant returning to the high-temperature main and supplied to the underfloor heating circuits is the same.

Figure 2 shows a diagram of the operation of the pumping and mixing unit of the low-temperature heating system, explaining the operation of the utility model in a particular case.

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

The supply of the high-temperature line T1 is communicated through the supply control valve 7 with the mixing area 5. The supply valve actuator 8, which has a temperature sensor 9, is set to 30°C. The return to the high-temperature line T2 is communicated through the return control valve 10 with the supply section 3. The drive 11, which has a temperature sensor 12, is set to 45°C. The supply section 3 communicates through the supply pipe 4 with the distribution manifold of the circulating coolant 14, and the mixing area 5 is connected through the return pipe 6 with the collector 15 for combining the circulating coolant. 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 underfloor heating circuits 16 through the collector 15 of the circulating coolant combination and through the coolant return pipe 6 enters the mixing area 5. In the area In the submix 5 there is a non-return 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 main T1 to flow into the underfloor heating circuits 16 from the side of the coolant return pipe 6, in the event that the circulation pump 1 stops working. and T4 are combined in the mixing pipe 2, mixed in the circulation pump 1 and enter the supply section 3.

Part of the coolant equal to the amount of coolant supplied

from the high-temperature main T1, returns through the return control valve 10 to the high-temperature main T2, and part of the coolant T3 enters through the coolant supply pipe 4 and the collector 14 for distributing the circulating coolant to the inlet to the underfloor heating circuits 16. As the warm floor circuits 16 warm up, the temperature rises coolant at their outlet, and the return temperature of the low-temperature coolant T4 rises. Each control valve, equipped with an actuator with a temperature sensor, operates as an independent proportional regulator of the coolant flow, depending on the temperature of the temperature sensor. When the temperature of the temperature sensor rises, the actuator acts on the control valve, reducing the throughput of this valve. When the temperature of the temperature sensor drops, the drive acts on the control valve, increasing the throughput of this valve.

If the supply temperature of the low-temperature heat carrier T3 exceeds the value set on the return valve actuator 11, the return control valve 10 closes, if the above temperature is lower than the value in the particular case of 45 ° C, then the return control valve 10 opens.

Thus, the return control valve 10, equipped with a drive 11, 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 11.

If the return temperature of the low-temperature heat carrier T4 exceeds the value set on the return valve actuator 8, the supply control valve 7 closes, if the above temperature is lower than the value in the particular case of 30 ° C, then the supply control valve 7 opens.

Thus, the supply control valve 7, equipped with a drive 8 having a temperature sensor 9, ensures the return temperature of the low-temperature heat carrier T4 at the level of the value set on the drive 8.

The features of a particular case of the utility model implementation include the following advantages:

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

2. When the supply valve drive 8 is disconnected or fails, the pump-mixing unit continues to control the low-temperature heating system, maintaining a constant low-temperature coolant supply temperature T3 at the value set on the return valve drive 11.

3. When the return valve actuator 11 is turned off or fails, the pump-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 supply valve actuator 8.

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 pump-mixing unit operates in normal mode.

The above advantages remain even if the pumping and mixing unit and manifolds 14 and 15 are spaced apart and communicate with each other through pipelines.

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

Claims (1)

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

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