Heat exchange energy-saving pipe-in-pipe circulation system

Abstract

The utility model belongs to the technical field of residential heating systems, and particularly relates to a heat exchange energy-saving pipe-in-pipe circulation system. Comprising a main pipeline unit and at least one home-entry unit. The main pipeline unit comprises a water heater, at least one main liquid inlet pipe, at least one main return pipe and at least one main circulating pump; the home-entry unit comprises a pipe-in-pipe pipeline, a home-entry liquid inlet pipe, a home-entry pump, a home-entry return pipe and a heat exchanger; the main pipeline unit is used for supplying hot water in a centralized mode, the home-entry unit is used for daily hot water use of each household, in the home-entry unit, the home-entry pump, the first channel, the second channel, the home-entry backflow pipe and the heating channel form the circulation preheating loop, and when the home-entry pump is started, media in the circulation preheating loop flow, and the heat exchange efficiency is improved. And heat conduction is carried out through the heat exchanger, so that the medium is preheated. When the water consumption point is opened, hot water can be instantly discharged from each water consumption point of the pipe-in-pipe pipeline.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of residential heating system, and particularly relates to a heat exchange energy-saving pipe-in-pipe circulating system. BACKGROUND

[0002] The hot water circulating system is a system for providing instant hot water, which re-sends the cold water in the hot water pipeline back to the water heater for heating through the circulating pump, so that the user can obtain hot water immediately when opening the faucet.

[0003] Patent No. CN109611944B discloses a pipe-in-pipe hot water circulating system, which comprises a water heater, a circulating pump, a check type starting valve, a hot water pipeline composed of hot water pipes and pipe joints, and a tail valve connected to an external device. The liquid inlet end of the circulating pump is connected to the output end of the water heater, and the output end of the circulating pump is connected to the check type starting valve; the hot water pipe is provided with a hot water flow channel communicating with the liquid inlet cavity of the starting valve and a backwater flow channel communicating with the backflow cavity of the starting valve, and the hot water pipes are connected to each other through the pipe joints; the liquid outlet end of the hot water pipe is provided with a tail valve, and the tail valve comprises a tail valve body, a tail valve liquid inlet cavity communicating with the hot water flow channel and a tail valve backflow cavity communicating with the backwater flow channel are arranged in the tail valve body, and the tail valve liquid inlet cavity and the tail valve backflow cavity can communicate with the external device. The pipe-in-pipe hot water circulating system has the characteristics of energy saving, convenient pipeline layout, and can realize rapid water outlet.

[0004] The above-mentioned pipe-in-pipe hot water circulating system is mainly suitable for single-family residential or hotel, if applied to multi-family residential and adopts centralized hot water supply, the following problems will exist:

[0005] 1. Each household has an independent water meter, when the hot water pipe of each household only circulates internally and does not use hot water, the hot water will produce a reading through the water meter and be charged, but in fact no hot water is used, resulting in incorrect water meter reading;

[0006] 2. For the pipeline with low hot water usage frequency, hot water circulation will cause heat waste and increase the use cost. SUMMARY

[0007] The utility model aims at providing a heat exchange energy-saving pipe-in-pipe circulating system which is simple in structure, accurate in charging and capable of providing instant hot water.

[0008] The utility model is achieved as follows:

[0009] A heat exchange energy-saving pipe-in-pipe circulating system, comprising a main pipeline unit and at least one household unit connected to the main pipeline unit;

[0010] The main pipeline unit comprises a water heater, at least one main liquid inlet pipe connected to the liquid outlet end of the water heater, at least one main backflow pipe connected to the backflow end of the water heater, and at least one main circulating pump.

[0011] The household unit comprises:

[0012] The pipe-in-pipe pipeline has a first channel and a second channel;

[0013] The household inlet pipe connects the main inlet pipe and the first channel;

[0014] The household pump is installed between the household inlet pipe and the pipe-in-pipe pipeline;

[0015] The household return pipe connects the second channel and the inlet end of the household pump; and

[0016] The heat exchanger has a heat medium channel connected to the main inlet pipe and a heating channel connected in series to the household return pipe;

[0017] A circulating preheating loop is formed among the household pump, the first channel, the second channel, the household return pipe and the heating channel,

[0018] The medium in the circulating preheating loop can be heat-conducted through the heat exchanger.

[0019] The heat exchanger is further provided with a heat medium inlet end and a heat medium outlet end connected to the heat medium channel,

[0020] The heat medium inlet end is connected to the main inlet pipe or the household inlet pipe through a heat medium inlet pipe, and the heat medium outlet end is connected to the main return pipe through a heat medium outlet pipe.

[0021] The main pipeline unit comprises a plurality of main inlet pipes and a main return pipe,

[0022] All the main inlet pipes are connected to the outlet end of the water heater through a total inlet pipe,

[0023] All the main return pipes are connected to the return end of the water heater through a total return pipe,

[0024] A plurality of household units are respectively installed between corresponding main inlet pipes and main return pipes.

[0025] The heat medium channel of the heat exchanger is connected in series to the main inlet pipe, and the main inlet pipe is connected to the main return pipe.

[0026] The main pipeline unit comprises a plurality of main inlet pipes and a main return pipe, and all the main inlet pipes are connected to the outlet end of the water heater through a total inlet pipe;

[0027] A plurality of household units are respectively installed on corresponding main inlet pipes.

[0028] The household inlet pipe is further provided with a household valve or / and a water meter.

[0029] The utility model further provides, the liquid outlet end of water heater or the parallel connection of water heater's backflow end has a plurality of main circulating pumps, the liquid outlet end of each main circulating pump all has main liquid inlet check valve in series.

[0030] The utility model further provides, the indoor unit further includes pipe in pipe liquid inlet valve, the pipe in pipe liquid inlet valve has pipe in pipe installation end of pipe in pipe pipeline, first liquid inlet installation end for intercommunication first channel, backflow installation end for intercommunication second channel,

[0031] The indoor liquid inlet pipe is connected first liquid inlet installation end through indoor pump,

[0032] Backflow installation end is provided with liquid outlet check valve for liquid outlet and connects indoor backflow pipe.

[0033] The utility model further provides, the pipe in pipe liquid inlet valve still is provided with second liquid inlet installation end for intercommunication second channel, and second liquid inlet installation end is provided with liquid inlet check valve for liquid inlet and connects indoor liquid inlet pipe.

[0034] The utility model further provides, the pipe in pipe pipeline includes pipe in pipe main road and at least one pipe in pipe branch, at least one pipe in pipe circulation end or / and at least one pipe in pipe liquid outlet end is provided on this pipe in pipe branch, and pipe in pipe circulation end is provided with electric actuator for controlling first channel and second channel conduction and close;

[0035] The indoor unit further includes control module for controlling indoor pump and electric actuator work.

[0036] The utility model discloses compared with prior art prominent and beneficial technical effect is:

[0037] 1, the main pipeline unit of the utility model is used for centralized supply hot water, and the indoor unit is used for the daily hot water use of each household, in the indoor unit, indoor pump, first channel, second channel, indoor backflow pipe and heating channel form the circulation preheating loop, when starting indoor pump, the medium (water) in this circulation preheating loop flows, and carries out heat conduction through heat exchanger, to realize the preheating of water. When the water point opens, each water point of pipe in pipe pipeline can realize instant hot water. In addition, under the condition that the water point is closed, the circulation of circulation preheating loop does not increase water meter reading, and guarantees the rights and interests of user.

[0038] 2, the utility unit of the utility model still includes control module for controlling the utility pump and the work of corresponding electric actuator, the control module is preferably inductive switch, the inductive switch is generally set on the road that must be passed of the water point, for example, the wall surface near the water point or the doorway. The pipeline that is not used for a long time all stores cold water, when the inductive switch senses the user, it controls the utility pump and the work of corresponding electric actuator, realizes the circulation of the pipe-in-pipe branch, then preheats through heat exchanger, so that before the user uses, the pipeline that the water point is in becomes hot water through circulation, guarantees that the user can instantaneously take hot water as soon as opening the water point, simultaneously, the pipe-in-pipe branch that other users are not detected is not circulated, like this is favorable to reduce the loss of hot water in other pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the structure schematic diagram of the first heat exchange energy-saving pipe-in-pipe circulation system of the utility model.

[0040] Figure 2 It is the structure schematic diagram of the first utility unit of the utility model.

[0041] Figure 3 It is the structure schematic diagram of the water point of pipe-in-pipe pipeline of the utility model.

[0042] Figure 4 It is the structure schematic diagram of the second heat exchange energy-saving pipe-in-pipe circulation system of the utility model.

[0043] Figure 5 It is the structure schematic diagram of the third heat exchange energy-saving pipe-in-pipe circulation system of the utility model.

[0044] Figure 6 It is the structure schematic diagram of the fourth heat exchange energy-saving pipe-in-pipe circulation system of the utility model.

[0045] Figure 7 It is the structure schematic diagram of the second utility unit of the utility model.

[0046] The meaning that the figure mark represents:

[0047] Main pipeline unit 1;Utility unit 2;Cold water inlet pipe 3;

[0048] Water heater 11;Main liquid inlet pipe 12;Main liquid inlet control valve 121;Main return pipe 13;Main return control valve 131;Main return check valve 132;Main circulating pump 14;Main liquid inlet check valve 141;Total liquid inlet pipe 15;Total return pipe 16;

[0049] Pipe-in-pipe pipeline 21;Pipe-in-pipe circulation end 211;Pipe-in-pipe liquid outlet end 212;Electric actuator 213;Inductive control module 214;Liquid outlet valve 215;Liquid outlet valve core 216;Three-way tail valve 217;

[0050] household inlet liquid pipe 22; household pump 23; household return pipe 24;

[0051] heat exchanger 25; heat medium inlet end 251; heat medium outlet end 252; heat medium inlet pipe 253; heat medium outlet pipe 254; heat medium one-way valve 255; heat medium control valve 256; heating inlet end 257; heating outlet end 258;

[0052] household valve 26; water meter 27;

[0053] pipe-in-pipe inlet valve 28; pipe-in-pipe installation end 281; first inlet installation end 282; return installation end 283; outlet check valve 284; second inlet installation end 285; inlet check valve 286. DETAILED DESCRIPTION

[0054] The utility model will be further described below in combination with specific embodiments:

[0055] Embodiment one:

[0056] As shown in the drawings, a heat exchange energy-saving pipe-in-pipe circulating system is used in multi-household residential buildings, which comprises a main pipe unit 1 and at least one household unit 2 connected to the main pipe unit 1. The main pipe unit 1 is used for centralized supply of hot water, and the household unit 2 is used for daily hot water use of each household. Figure 1 The main pipe unit 1 mainly comprises a water heater 11, at least one main inlet pipe 12, at least one main return pipe 13, and at least one main circulating pump 14.

[0057] The water heater can be an electric water heater, a gas water heater, a solar water heater, a heat pump water heater, a boiler system, an instant water heater, and a storage water heater, etc. The water heater of the embodiment has a hot water outlet, a hot water return port, and a cold water inlet. The main inlet pipe 12 is connected to the hot water outlet (i.e. the outlet end of the water heater 11), the main return pipe 13 is connected to the hot water return port (i.e. the return end of the water heater 11), and a cold water inlet pipe 3 is connected to the cold water inlet. The cold water inlet pipe 3 is generally a tap water pipe and is used for supplying cold water. In another embodiment, the hot water return port and the cold water inlet can also be combined into one interface.

[0058] The main circulating pump 14 can be arranged at the outlet end of the water heater 11 or the return end of the water heater 11 and is used for hot water pressurization. The number of the main circulating pump 14 depends on the demand of the system. When the demand is relatively small, one main circulating pump 14 is generally arranged in the system, and a main inlet check valve 141 is arranged at the outlet end of the main circulating pump 14 to prevent hot water from flowing back in the main inlet pipe 12. When the demand is relatively large, two or more main circulating pumps 14 are generally arranged in the system.

[0059] Figure 1 ​As shown, a main liquid inlet control valve 121 is arranged at the liquid outlet end of the water heater 11, and the main liquid inlet control valve 121 is preferably a manual control valve. Two main circulating pumps 14 are connected in parallel to the main liquid inlet pipe 12 connected to the main liquid inlet control valve 121, and a main liquid inlet check valve 141 is connected in series to the liquid outlet end of each main circulating pump 14. During a water use peak, both main circulating pumps 14 work simultaneously; during a water use low peak, one main circulating pump 14 works, thereby meeting the user's demand and reducing operating costs. In addition, when one main circulating pump 14 fails, the other main circulating pump 14 can work instead, ensuring that the system works 24 hours a day without stopping, thereby reducing user losses.

[0060] A main return control valve 131 and a main return check valve 132 are arranged in sequence on the main return pipe 13 close to the water heater 11, as shown. Figure 1 As shown, the main return control valve 131 of the present embodiment is provided with two, one being an electric control valve and the other being a manual control valve, which are respectively installed at the two ends of the main return check valve 132, and the main return check valve 132 is used to prevent the main return pipe 13 from returning.

[0061] As shown, Figure 2 The indoor unit 2 includes a pipe-in-pipe pipeline 21, an indoor liquid inlet pipe 22, an indoor pump 23, an indoor return pipe 24, a pipe-in-pipe liquid inlet valve 28, and a heat exchanger 25.

[0062] The pipe-in-pipe pipeline 21 has a first channel and a second channel. Specifically, the pipe-in-pipe pipeline 21 includes a pipe-in-pipe main path and at least one pipe-in-pipe branch path, both of which are spliced by corresponding pipe-in-pipes and pipe-in-pipe joints. Each pipe-in-pipe includes an inner pipe and an outer pipe arranged coaxially, an inner flow channel is formed inside the inner pipe, and an outer flow channel is formed between the inner pipe and the outer pipe. The inner flow channel and the outer flow channel correspond to the first channel and the second channel. On the pipe-in-pipe main path or the pipe-in-pipe branch path, corresponding water outlet devices such as faucets and showers are arranged according to the positions of each hot water use point.

[0063] For example, for a household, the pipe-in-pipe main path can be understood as a pipeline arranged between rooms, and the pipe-in-pipe branch path can be understood as a pipeline arranged in a single room. The number of pipe-in-pipe branch paths is set according to the number of rooms, and the number of use points on the pipe-in-pipe branch path can be set according to the needs of each room. For example, one hot water use point is arranged in a general kitchen, two hot water use points (corresponding to a basin and a shower) are arranged in a bathroom, and one hot water use point is arranged in a balcony room, and so on.

[0064] The pipe-in-pipe inlet valve 28 is used to connect the pipe-in-pipe line 21, the inlet inlet pipe 22, and the inlet return pipe 24. It has a pipe-in-pipe mounting end 281 for connecting the pipe-in-pipe line 21, a first inlet mounting end 282 for connecting the first channel, and a return mounting end 283 for connecting the second channel. The return mounting end 283 is equipped with an outlet check valve 284 for discharging liquid and is connected to the inlet return pipe 24.

[0065] like Figure 2 As shown, in this embodiment, the first channel is the inner flow channel, and the second channel is the outer flow channel.

[0066] The inlet pipe 22 is a regular pipe, with one end connected to the main inlet pipe 12 and the other end connected to the first inlet installation end 282 via the inlet pump 23. That is, the inlet pump 23 is installed between the inlet pipe 22 and the first channel of the pipe-in-pipe 21. The inlet pipe 22 is equipped with an inlet valve 26 and a water meter 27. The inlet valve 26 is preferably a manual control valve, used to control the hot water supply to the household. The water meter 27 is used to calculate the hot water consumption, which is convenient for the hot water operator to charge.

[0067] The heat exchanger 25 has a heat medium channel connected to the main inlet pipe 12 and a heating channel connected in series with the inlet return pipe 24. Specifically, the heat exchanger 25 is provided with a heat medium inlet end 251 and a heat medium outlet end 252 connected to the heat medium channel. The heat medium inlet end 251 is connected to the main inlet pipe 12 or the inlet inlet pipe 22 through a heat medium inlet pipe 253, and the heat medium outlet end 252 is connected to the main return pipe 13 through a heat medium outlet pipe 254. The heat medium outlet pipe 254 is provided with a heat medium check valve 255 to prevent backflow and / or a heat medium control valve 256 to control the operation of the heat medium channel.

[0068] In this embodiment, the inlet end of the heat medium inlet pipe 253 is located on the inlet pipe 22 between the inlet valve 26 and the water meter 27. This way, when the house is not occupied for an extended period, manually closing the inlet valve 26 will prevent hot water from the main inlet pipe 12 from entering the pipe-in-pipe 21 and the heat exchanger 25, thus preventing additional energy loss in the heat exchanger 25. Simultaneously, during normal use, the amount of hot water in the heat medium channel of the heat exchanger 25 is not consumed; only a portion of the heat is consumed. The hot water in the heat medium inlet pipe 253 does not pass through the water meter 27, thus not affecting the water meter reading. Furthermore, the heat medium outlet pipe 254 is equipped with a heat medium control valve 256, which is preferably a manual control valve, to control the flow rate of the heat medium channel.

[0069] The heat exchanger 25 is further provided with a heating liquid inlet end 257 and a heating liquid outlet end 258 connected to the heating channel. The indoor return pipe 24 includes a first indoor return pipe and a second indoor return pipe. The first indoor return pipe is installed between the return installation end 283 and the heating liquid inlet end 257. The second indoor return pipe is installed between the heating liquid outlet end 258 and the liquid inlet end of the indoor valve 26. The second indoor return pipe is connected to the indoor liquid inlet pipe 22 behind the water meter 27, so that a circulating preheating loop is formed between the indoor pump 23, the first channel and the second channel of the pipe-in-pipe pipeline 21, the first indoor return pipe, the heating channel, and the second indoor return pipe. When the indoor pump 23 is started, the medium (water) in the circulating preheating loop flows and conducts heat through the heat exchanger 25, thereby realizing preheating of the water. When the water point is opened (the user uses the water outlet device), each water point of the pipe-in-pipe pipeline 21 can realize instant hot water. At the same time, when the water point is closed, the circulation of the circulating preheating loop does not increase the reading of the water meter 27, thereby protecting the rights and interests of the user.

[0070] Generally, the hot water in the main pipeline unit 1 is continuously heated. The heat medium channel of the heat exchanger 25 always has hot water. For the user, as long as the indoor pump 23 starts to work, the heat exchanger 25 can transfer heat to the circulating preheating loop to meet the user's demand. However, the working of the heat exchanger 25 will cause heat loss of the main liquid inlet pipe 12, which is not conducive to the hot water operator. In order to solve this problem, the hot water operator can compensate in the form of policy subsidies, including the heat loss in the hot water fee, installing a hot water meter on the heat medium liquid inlet pipe 253 or the heat medium liquid outlet pipe 254 for separate charging, and the like.

[0071] In addition, the hot water operator can control the return amount of the main return pipe 13 by adjusting the main return control valve 131. Generally, when the water demand is small (such as at night), the main return control valve 131 needs to be closed to prevent excessive circulation of hot water in the pipeline and cause excessive loss. When the water demand is normal (such as during the day), the main return control valve 131 needs to be opened to ensure that the indoor unit 2 can normally use the heat exchanger 25. When the water demand is high (such as in the morning or evening), the main return control valve 131 needs to be closed or closed to prioritize the supply of hot water to the water point. In the embodiment, the purpose of designing the electric control valve is to realize precise control and intelligent control.

[0072] Wherein, in order to increase the water consumption of the user at the water use point, the pipe-in-pipe liquid inlet valve 28 is also preferably provided with a second liquid inlet mounting end 285 for communicating the second channel, the second liquid inlet mounting end 285 is provided with a liquid inlet check valve 286 for liquid inlet and is connected to the indoor liquid inlet pipe 22, that is, the indoor liquid inlet pipe 22 contains a first liquid inlet branch pipe connected to the liquid inlet end of the indoor pump 23 and a second liquid inlet branch pipe connected to the second liquid inlet mounting end 285. Under the working state of the main circulating pump 14, the water inlet pressure of the main liquid inlet pipe 12 is sufficient to open the liquid inlet check valve 286. At this time, when the water use point of the pipe-in-pipe pipeline 21 is opened, the main liquid inlet pipe 12 can simultaneously outlet hot water through the first channel and the second channel, ensuring the water quantity of the water use point.

[0073] As shown in Figure 2 and 3 At least one pipe-in-pipe circulating end 211 or / and at least one pipe-in-pipe liquid outlet end 212 is arranged on at least one pipe-in-pipe branch, and the pipe-in-pipe circulating end 211 is provided with an electric actuator 213 for controlling the conduction and closing of the first channel and the second channel.

[0074] Specifically, a three-way tail valve 217 is arranged at the water use point of the pipe-in-pipe branch, the three-way tail valve 217 includes a pipe-in-pipe connecting end connected to the pipe-in-pipe, a pipe-in-pipe liquid outlet end 212 for installing a water outlet device, and a pipe-in-pipe circulating end 211 for installing an electric actuator 213. The pipe-in-pipe connecting end, the pipe-in-pipe liquid outlet end 212, and the pipe-in-pipe circulating end 211 are respectively provided with channels for communicating the inner flow channel and the outer flow channel. The electric actuator 213 opens or closes the two channels by sealing the inner flow channel or the outer flow channel. Under normal circumstances, the electric actuator 213 is in a closed state. When internal circulation preheating is needed, the inner flow channel or the outer flow channel is opened to realize the conduction of the two channels.

[0075] The pipe-in-pipe liquid outlet end 212 is provided with a liquid outlet valve core 216 and a liquid outlet valve 215. The liquid outlet valve 215 is preferably an angle valve, and the liquid outlet valve core 216 is preferably a delay temperature control valve core. When it does not sense hot water, it blocks one of the flow channels (blocks the inner flow channel or the outer flow channel), and the other flow channel is always kept unblocked. After the liquid outlet valve 215 is opened, the unblocked flow channel preferentially outlets liquid. When the delay temperature control valve core senses hot water, the other flow channel is opened, and the inner and outer flow channels simultaneously outlet liquid. The structure of the delay temperature control valve core is described in detail in patent documents CN 213271075U, CN 214367847U, etc.

[0076] The indoor unit 2 further comprises a control module for controlling the indoor pump 23 and the corresponding electric actuator 213, which comprises an inductive control module 214 or a mechanical control module or a remote control module, and in the embodiment, the inductive control module 214, which is an inductive switch, and the number of inductive switches corresponds to the electric actuators 213, which can be one-to-one correspondence or one inductive switch corresponding to multiple electric actuators 213, and is mainly used for controlling the indoor pump 23 and the corresponding electric actuator 213 to work. The inductive control module 214 is generally arranged on the path that must be passed through the water point, such as the door or the wall surface near the water point. The pipeline that is not used for a long time stores cold water, and when the inductive switch senses the user, it controls the indoor pump 23 and the corresponding electric actuator 213 to work, realizes the circulation of the pipe-in-pipe branch, and then preheats the cold water in the pipeline through the heat exchanger 25, so that before the user uses it, the pipeline where the water point is located is changed into hot water through circulation, ensuring that the user can immediately get hot water as soon as the water point is opened. At the same time, the pipe-in-pipe branch that does not detect the user does not participate in the circulation, which is conducive to reducing the loss of hot water in other pipelines.

[0077] The preheating time of the circulation preheating circuit is determined by the working time of the indoor pump 23, which can be set by the program of the control module or controlled by the temperature sensor. For example, a temperature sensor is arranged near the water point or on the indoor return pipe 24, and when the temperature sensor detects that the water temperature reaches the preset temperature, the indoor pump 23 is controlled to be closed.

[0078] In the embodiment, as shown in Figure 1 there are five water points, namely No. 1 water point, No. 2 water point, No. 3 water point, No. 4 water point and No. 5 water point, wherein No. 1 water point, No. 2 water point, No. 3 water point and No. 4 water point are provided with liquid outlet valve core 216, liquid outlet valve 215 and electric actuator 213, and corresponding No. 1 inductive switch, No. 2 inductive switch, No. 3 inductive switch and No. 4 inductive switch are arranged near different water points. Assuming that when the user passes through the No. 1 inductive switch, it will control the indoor pump 23 and the No. 1 electric actuator of the No. 1 water point to open, at this time, the inlet chamber of the indoor pump 23, the pipe-in-pipe branch, part of the inner flow channel and the outer flow channel of the pipe-in-pipe main pipe connected with the pipe-in-pipe branch, and the indoor return pipe 24 form the circulation preheating circuit this time, and the cold water in the pipeline is preheated through the heat exchanger 25, and when the No. 1 water point is opened, hot water can be enjoyed at the first time, avoiding long waiting for hot water and saving the amount of cold water in the early stage, thereby improving the quality of life.

[0079] In addition, only the liquid outlet valve core 216 and the liquid outlet valve 215 are arranged on the pipe-in-pipe branch of the water point No. 5, which is located near the water point No. 2 with a relatively high frequency of use. The hot water use or preheating of the water point No. 2 can ensure that a certain amount of hot water is stored in the pipeline adjacent to the water point No. 5, so that the water point No. 5 can also quickly realize hot water supply.

[0080] Embodiment Two

[0081] The embodiment is basically the same as the embodiment one, and the difference lies in that:

[0082] The embodiment is suitable for multi-family residential buildings and villa groups with small hot water demand.

[0083] As shown in the figure, the main pipeline unit 1 mainly includes a water heater 11, a main liquid inlet pipe 12, a main return pipe 13, and a main circulating pump 14. The main circulating pump 14 is installed at the return end of the water heater 11, i.e., on the main return pipe 13. Figure 4

[0084] The main pipeline unit 1 is provided with a plurality of household units 2. In the embodiment, four household units 2 are shown. Each household unit 2 includes a pipe-in-pipe pipeline 21, a household liquid inlet pipe 22, a household pump 23, a household return pipe 24, a pipe-in-pipe liquid inlet valve 28, and a heat exchanger 25.

[0085] The heat exchanger 25 is provided with a heat medium liquid inlet end 251 and a heat medium liquid outlet end 252 communicating with the heat medium passage. The heat medium liquid inlet end 251 is connected to the main liquid inlet pipe 12 through a heat medium liquid inlet pipe 253, and the heat medium liquid outlet end 252 is connected to the main return pipe 13 through a heat medium liquid outlet pipe 254. The heat medium liquid outlet pipe 254 is provided with a heat medium one-way valve 255 to prevent backflow.

[0086] In another installation mode, the heat medium liquid inlet pipe 253 of the heat exchanger 25 of the first household is connected to the main liquid inlet pipe 12, the heat medium liquid outlet pipe 254 of the first household is directly connected to the heat medium liquid inlet pipe 253 of the heat exchanger 25 of the second household, and then the heat medium liquid outlet pipe 254 of the second household can be directly connected to the heat medium liquid inlet pipe 253 of the heat exchanger 25 of the third household or directly connected back to the main return pipe 13 through the heat medium one-way valve 255. At this time, the household liquid inlet pipe 22 of the second household can also be directly installed on the heat medium liquid outlet pipe 254 (equivalent to the heat medium liquid inlet pipe 253) of the first household.

[0087] ​The inlet pipe 22 is a common pipe, the front end of which is connected to the main inlet pipe 12 and provided with an inlet valve 26 and a water meter 27, the rear end of which comprises a first inlet branch pipe connected to the inlet end of the inlet pump 23 and a second inlet branch pipe connected to the second inlet installation end 285, the first inlet branch pipe is connected to the first inlet installation end 282 of the pipe-in-pipe inlet valve 28 through the inlet pump 23, the second inlet branch pipe is connected to the second inlet installation end 285 of the pipe-in-pipe inlet valve 28 through the inlet check valve 286, and the return installation end 283 of the pipe-in-pipe inlet valve 28 is connected to the inlet return pipe 24 through the outlet check valve 284.

[0088] The heat exchanger 25 is further provided with a heating inlet end 257 and a heating outlet end 258 connected to the heating channel, the inlet return pipe 24 comprises a first inlet return pipe and a second inlet return pipe, the first inlet return pipe is installed between the return installation end 283 and the heating inlet end 257, and the second inlet return pipe is installed between the heating outlet end 258 and the inlet end of the inlet valve 26, which is equivalent to the second inlet return pipe connected to the inlet pipe 22 behind the water meter 27, so that a preheating circulation loop is formed between the inlet pump 23, the first channel, the second channel, the first inlet return pipe, the heating channel and the second inlet return pipe.

[0089] Embodiment three:

[0090] The embodiment is basically the same as the first embodiment, and the difference lies in that:

[0091] The embodiment is suitable for multi-family residential buildings with large hot water demand, especially for unit buildings.

[0092] As shown in Figure 5 The main pipe unit 1 comprises a plurality of main inlet pipes 12 and main return pipes 13, all of which are connected to the outlet end of the water heater 11 through the total inlet pipe 15, and all of which are connected to the return end of the water heater 11 through the total return pipe 16. For example, a total inlet pipe 15 and a total return pipe 16 are vertically arranged in a unit building, and a main inlet pipe 12 connected to the total inlet pipe 15 and a main return pipe 13 connected to the total return pipe 16 are arranged on each floor.

[0093] In the embodiment, a main inlet control valve 121 is arranged at the outlet end of the water heater 11, and the main inlet control valve 121 is preferably a manual control valve, two main circulation pumps 14 are connected in parallel to the total inlet pipe 15 connected to the main inlet control valve 121, and the outlet end of each main circulation pump 14 is connected in series with a main inlet check valve 141. A main return control valve 131 and a main return check valve 132 are arranged in sequence on the total return pipe 16 close to the water heater 11, and the main return check valve 132 and the manual control valve are arranged.

[0094] The household unit 2 of the embodiment is basically the same as that of the first embodiment. The user of each floor connects the household inlet pipe 22 of the household unit 2 to the main inlet pipe 12 of the corresponding floor and connects the heat medium outlet pipe 254 of the heat exchanger 25 to the main return pipe 13 of the corresponding floor, so that parallel pipe arrangement is realized.

[0095] Embodiment Four

[0096] The embodiment is basically the same as the first embodiment, and the difference lies in that:

[0097] The embodiment is suitable for multi-family residential buildings with high hot water demand, especially unit buildings.

[0098] As shown in Figure 6 , the main pipe unit 1 includes a plurality of main inlet pipes 12 and a main return pipe 13. All the main inlet pipes 12 are connected to the outlet end of the water heater 11 through a total inlet pipe 15. For example, a total inlet pipe 15 and a main return pipe 13 are vertically arranged in a unit building, and a main inlet pipe 12 is arranged in each floor and connected between the total inlet pipe 15 and the main return pipe 13.

[0099] In the embodiment, a main inlet control valve 121 is arranged at the outlet end of the water heater 11. The main inlet control valve 121 is preferably a manually controlled valve. Two main circulating pumps 14 are connected in parallel to the total inlet pipe 15 connected to the main inlet control valve 121. The outlet end of each main circulating pump 14 is connected in series with a main inlet check valve 141. A main return control valve 131 and a main return check valve 132 are arranged in sequence on the total return pipe 16 close to the water heater 11. The main return control valve 131 is an electrically controlled valve, and the main return check valve 132 is a manually controlled valve.

[0100] As shown in Figure 7 , the user of each floor connects the household inlet pipe 22 of the household unit 2 to the main inlet pipe 12 of the corresponding floor and connects the heat medium passage of the heat exchanger 25 directly in series to the main inlet pipe 12, so that series-parallel hydraulic balance pipe arrangement is realized.

[0101] Embodiment Five

[0102] The embodiment is basically the same as the first embodiment, and the difference lies in that:

[0103] The outlet valve 215 is directly arranged at the water use point of the pipe-in-pipe branch, so that the inner flow passage and the outer flow passage are connected at the pipe-in-pipe outlet end 212 of the pipe-in-pipe branch. In this way, without the need for an electric actuator 213, the pipe-in-pipe branch will automatically circulate when the household pump 23 is started, thereby preheating the pipeline and forming hot water. This mode is suitable for water use points with high water use frequency.

[0104] Embodiment Six

[0105] The embodiment is basically the same as that in Embodiment Five, except that:

[0106] A tail valve spool is arranged in the liquid outlet valve 215, and in the normal state, the spool of the tail valve spool abuts against the inner flow channel or the outer flow channel through an elastic member, a small passage for conducting the inner flow channel or the outer flow channel is arranged on the spool, or a structure capable of conducting the inner flow channel or the outer flow channel by changing the pressure is arranged on the spool, when the house pump 23 is started, the pipe-in-pipe branch will also automatically circulate, thereby preheating the pipeline and forming hot water, compared with Embodiment Five, the circulation amount is relatively small, and the water consumption point is suitable for high water consumption frequency.

[0107] The specific structure of the tail valve spool is shown in patent documents with the patent numbers CN108302227B and CN207921407U.

[0108] The above embodiments are only preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. A heat exchanging energy saving pipe-in-pipe circulation system, characterized in that, The main pipeline unit (1) and at least one household unit (2) connected to the main pipeline unit (1); The main pipeline unit (1) comprises a water heater (11), at least one main liquid inlet pipe (12) connected to the liquid outlet end of the water heater (11), at least one main liquid return pipe (13) connected to the liquid return end of the water heater (11), and at least one main circulating pump (14); The household unit (2) comprises: A pipe-in-pipe pipeline (21) having a first channel and a second channel; A household liquid inlet pipe (22) connected to the main liquid inlet pipe (12) and the first channel; A household pump (23) installed between the household liquid inlet pipe (22) and the pipe-in-pipe pipeline (21); A household liquid return pipe (24) connected to the second channel and the liquid inlet end of the household pump (23); and A heat exchanger (25) having a heat medium channel connected to the main liquid inlet pipe (12) and a heating channel connected in series to the household liquid return pipe (24); The household pump (23), the first channel, the second channel, the household liquid return pipe (24), and the heating channel form a circulating preheating loop, and the medium in the circulating preheating loop can conduct heat through the heat exchanger (25).

2. A heat exchanging energy saving pipe-in-pipe circulation system according to claim 1, characterized in that: The heat exchanger (25) is provided with a heat medium liquid inlet end (251) and a heat medium liquid outlet end (252) connected to the heat medium channel, The heat medium liquid inlet end (251) is connected to the main liquid inlet pipe (12) or the household liquid inlet pipe (22) through a heat medium liquid inlet pipe (253), and the heat medium liquid outlet end (252) is connected to the main liquid return pipe (13) through a heat medium liquid outlet pipe (254).

3. A heat exchanging energy saving pipe-in-pipe circulation system according to claim 2, wherein: The main pipeline unit (1) comprises a plurality of main liquid inlet pipes (12) and main liquid return pipes (13) of the same number, All the main liquid inlet pipes (12) are connected to the liquid outlet end of the water heater (11) through a total liquid inlet pipe (15), All the main liquid return pipes (13) are connected to the liquid return end of the water heater (11) through a total liquid return pipe (16), A plurality of household units (2) are respectively installed between corresponding main liquid inlet pipes (12) and main liquid return pipes (13).

4. The heat exchanging energy saving pipe-in-pipe circulation system according to claim 1, characterized in that: The heat medium channel of the heat exchanger (25) is connected in series to the main liquid inlet pipe (12), and the main liquid inlet pipe (12) is connected to the main liquid return pipe (13).

5. A heat exchanging energy saving pipe-in-pipe circulation system according to claim 4, wherein: The main pipeline unit (1) comprises a plurality of main liquid inlet pipes (12) and a main liquid return pipe (13), and all the main liquid inlet pipes (12) are connected to the liquid outlet end of the water heater (11) through a total liquid inlet pipe (15); A plurality of household units (2) are respectively installed on corresponding main liquid inlet pipes (12).

6. A heat exchanging energy saving pipe-in-pipe circulation system according to any one of claims 2-5, characterized in that: The household liquid inlet pipe (22) is provided with a household valve (26) or / and a water meter (27).

7. A heat exchanging energy saving pipe-in-pipe circulation system according to any one of claims 1 to 5, wherein: A plurality of main circulating pumps (14) are connected in parallel at the liquid outlet end of the water heater (11) or the liquid return end of the water heater (11), and the liquid outlet end of each main circulating pump (14) is connected in series with a main liquid inlet check valve (141).

8. A heat exchanging energy saving pipe-in-pipe circulation system according to any one of claims 1 to 5, wherein: The home entry unit (2) further comprises a pipe-in-pipe liquid inlet valve (28) having a pipe-in-pipe installation end (281) connected to the pipe-in-pipe pipeline (21), a first liquid inlet installation end (282) for communicating the first channel, a backflow installation end (283) for communicating the second channel, The home liquid inlet pipe (22) is connected to the first liquid inlet installation end (282) through the home pump (23), The backflow installation end (283) is provided with a liquid outlet check valve (284) for liquid outlet and is connected to the home backflow pipe (24).

9. A heat exchanging energy saving pipe-in-pipe circulation system according to claim 8, wherein: The pipe-in-pipe liquid inlet valve (28) is further provided with a second liquid inlet installation end (285) for communicating the second channel, the second liquid inlet installation end (285) is provided with a liquid inlet check valve (286) for liquid inlet and is connected to the home liquid inlet pipe (22).

10. The heat exchanging energy saving pipe-in-pipe circulation system according to claim 8, wherein: The pipe-in-pipe pipeline (21) comprises a pipe-in-pipe main pipeline and at least one pipe-in-pipe branch pipeline, at least one pipe-in-pipe circulation end (211) or / and at least one pipe-in-pipe liquid outlet end (212) is arranged on the pipe-in-pipe branch pipeline, the pipe-in-pipe circulation end (211) is provided with an electric actuator (213) for controlling the first channel and the second channel to be open or closed; The home entry unit (2) further comprises a control module for controlling the home pump (23) and the electric actuator (213) to work.

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