CN215637507U

CN215637507U - Hot water circulating system with branch differential water outlet

Info

Publication number: CN215637507U
Application number: CN202121318631.XU
Authority: CN
Inventors: 陈友苗; 陈奎宏
Original assignee: Zhejiang Guanyi Pipe Industry Co ltd
Current assignee: Zhejiang Guanyi Pipe Industry Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-01-25
Anticipated expiration: 2031-06-11

Abstract

The utility model belongs to the technical field of domestic water, and particularly relates to a hot water circulating system with a branch pipe discharging water in a differential mode. The pipeline comprises a main pipeline and a plurality of pipe-in-pipe pipelines; the main pipeline comprises a water heater, a main circulating pipe and a circulating pump, a liquid outlet of the water heater is communicated with a liquid inlet of the circulating pump through the main circulating pipe, and a liquid outlet of the circulating pump is communicated with a liquid inlet of the circulating pump through the main circulating pipe; the pipe-in-pipe pipeline comprises a pipe-in-pipe and a delay water outlet valve arranged on the pipe-in-pipe; when the delay water outlet valve is opened, the inner runner can preferentially discharge water, and the outer runner can delay water discharge. Under the work of the circulating pump, the utility model can lead the hot water of the main pipeline to continuously circulate, thereby ensuring the continuous supply of the hot water; and when the pipe-in-pipe pipeline is not used, the hot water circulation of the main pipeline is not involved, and compared with the traditional hot water circulation system, the energy loss of the branch can be saved, the energy conservation and emission reduction are realized, and the system operation cost is reduced. At the same time, the load of the circulation pump can also be reduced.

Description

Hot water circulating system with branch differential water outlet

Technical Field

The utility model belongs to the technical field of domestic water, and particularly relates to a hot water circulating system with a branch pipe discharging water in a differential mode.

Background

In the hot water circulation system, in order to realize quick water outlet, two main pipelines are generally designed, one is a main water inlet pipe, the other is a main water outlet pipe, a plurality of water outlet branches connected to a room are arranged between the main water inlet pipe and the main water outlet pipe, and the water outlet branches and the main pipelines participate in hot water major circulation together, so that the water outlet branches can be guaranteed to have hot water all the time, and the instant hot water circulation is realized.

However, the water outlet branch has the problems of long pipeline, poor wall heat preservation, low utilization rate and the like, so that the branch heat loss is serious in the hot water large circulation, and the running cost of the hot water circulation system is expensive.

Disclosure of Invention

The utility model aims to provide a branch differential water outlet hot water circulating system which is simple in structure, low in cost, energy-saving, environment-friendly and capable of quickly discharging hot water.

The purpose of the utility model is realized as follows:

a hot water circulating system with branch differential water outlet,

comprises a main pipeline and a plurality of pipe-in-pipe pipelines arranged on the main pipeline;

the main pipeline comprises a water heater, a main circulating pipe and a circulating pump, and a main flow passage is arranged in the main circulating pipe; the liquid outlet of the water heater is communicated with the liquid inlet of the circulating pump through a main circulating pipe, and the liquid outlet of the circulating pump is communicated with the liquid inlet of the circulating pump through the main circulating pipe;

the pipe-in-pipe pipeline comprises a pipe-in-pipe and a delay water outlet valve arranged on the pipe-in-pipe; the pipe-in-pipe is provided with an inner runner and an outer runner, and the inner runner and the outer runner are both communicated with the main runner;

when the delay water outlet valve is opened, the inner runner can preferentially discharge water, and the outer runner can delay water discharge.

Preferably, the delay outlet valve comprises a thermostatic valve body and a thermostatic valve core, and the thermostatic valve core comprises:

the valve core is arranged in the temperature control valve body and used for separating the inner flow passage and the outer flow passage; a first outer liquid inlet hole communicated with the outer flow passage is formed in the side wall of the valve core;

the piston is movably arranged on the inner wall of the valve core through a resetting piece and is used for adjusting the liquid inlet amount of the first outer liquid inlet hole;

the temperature control device is arranged on the valve core communicated with the inner flow passage and is connected with the piston;

when the temperature control device senses hot water, the piston is driven to move for a corresponding distance according to the temperature of the hot water, and the liquid inlet amount of the first outer liquid inlet hole is adjusted.

Preferably, the temperature control device comprises a temperature control seat arranged on the valve core, a temperature sensing medium and a temperature control rod are arranged in the temperature control seat, the temperature sensing medium drives the temperature control rod and the temperature control seat to move relatively through volume change, and driving of the piston is achieved.

Preferably, the piston is made of ceramic or plastic or metal.

Preferably, the outer wall of the valve core is provided with an outer check structure, and the outer check structure is arranged on the outer flow passage.

Preferably, a filter screen is arranged on the valve core outside the first outer liquid inlet hole or in the outer flow passage.

Preferably, the delay water outlet valve comprises a water outlet valve body, a water outlet end and a pipe-in-pipe connecting end are arranged on the water outlet valve body, an inner flow passage communicating with a pipe-in-pipe inner pipe and an outer flow passage communicating with a pipe-in-pipe outer pipe are arranged on the pipe-in-pipe connecting end, and the water outlet end is communicated with the inner flow passage and the outer flow passage through an inner cavity of the water outlet valve body;

the inner side of the pipe-in-pipe connecting end is provided with a delay sealing part, the inner cavity of the water outlet valve body is provided with a damping piston and a first reset piece for providing elasticity, and the damping piston is arranged on the outer side wall of the delay sealing part and realizes the sealing/conduction of an outer flow passage;

when the internal medium pushes the damping piston to separate the delay sealing part, the delayed liquid outlet of the flow passage where the damping piston is located is realized.

Preferably, be provided with the damping chamber in the outlet valve body, be provided with in the damping chamber damping piston and first piece that resets, still be provided with damping adjustment flow channel in the damping chamber.

Preferably, the water outlet valve body is provided with a connecting pipe with an internal flow passage, and the connecting pipe extends into the inner cavity of the water outlet valve body to form the delay sealing part; a plurality of second outer liquid inlet holes are formed in the water outlet valve body on the outer side of the connecting pipe, and the second outer liquid inlet holes are communicated with the outer flow channel.

Preferably, the outer end joint of connecting pipe has movable seal cover and second piece that resets, movable seal cover is used for connecting pipe well inner tube.

Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:

1. under the work of the circulating pump, the utility model can lead the hot water of the main pipeline to continuously circulate, thereby ensuring the continuous supply of the hot water; when the pipe-in-pipe pipeline is not used, the hot water circulation of the main pipeline is not involved, and compared with the traditional hot water circulation system, the energy loss of the branch pipeline can be saved, the energy conservation and emission reduction are realized, and the system operation cost is reduced. At the same time, the load of the circulation pump can also be reduced.

For the above reasons, when the pipe-in-pipe pipeline is not used for a long time, the water in the pipe is generally cold water. When the delay water outlet valve is opened, the inner flow passage can preferentially discharge water, and the outer flow passage delays water discharge. Because the aperture ratio of the inner flow passage is smaller, compared with a common pipeline, the cold water emptying rate is greatly reduced, the hot water outlet time is shortened, and the quick outlet of hot water is ensured.

2. In the temperature control type delay water outlet valve structure, because the initial position of the piston is used for sealing the first outer liquid inlet hole, hot water is firstly discharged from the inner flow passage when the water is discharged, the liquid discharge of the outer flow passage is delayed through the temperature control device, namely, the cold water discharge of the outer flow passage is delayed, and therefore a user can quickly use the hot water.

When the temperature control device senses hot water, the piston is driven to move for a corresponding distance according to the temperature of the hot water, and the liquid inlet amount of the first outer liquid inlet hole is adjusted. Because the piston moves slowly, the temperature curve of the outlet water after the cold water of the outer flow passage is intersected with the hot water of the inner flow passage is more stable, and the comfortable water using experience of a user can be better achieved. Meanwhile, cold water of the outer channel is utilized, and water resources are saved.

3. In the mechanical delayed outlet valve structure, the outer flow passage is sealed by a damping piston. When a user uses water, the inner flow passage preferentially discharges water, and the water discharging speed is high because the amount of cold water in the inner flow passage is small. At this time, if water is used for a short time, the outer flow passage is not normally opened, so that cold water discharge of a part of the outer flow passage can be saved and the time for discharging the part of cold water can be saved. After a certain time, the medium of outer runner can slowly drive the damping piston and open outer runner, and outer runner and interior runner go out water together, and the hot water of outer runner can be with the hot water of interior runner originally, and the temperature is moderate, can not influence user's use, just can experience the hot water of normal water yield among several seconds, can satisfy the water of big demand. In the process, the cold water of the external flow passage which needs to be emptied originally is utilized, and the waste of water resources is reduced.

Drawings

Fig. 1 is a schematic view showing the construction of a hot water circulation system according to the present invention.

Fig. 2 is a schematic structural diagram of a first delayed outlet valve of the present invention.

FIG. 3 is a schematic diagram of the construction of a thermal control valve cartridge of the present invention.

Fig. 4 is a schematic structural diagram of a second delayed outlet valve of the present invention.

Fig. 5 is a schematic structural diagram of a third delayed outlet valve of the present invention.

The reference numerals in the figures denote the meanings:

1-tube in tube; 2-delay water outlet valve; 3-a temperature control valve core; 4-a water heater; 5-main circulation pipe; 6-circulating pump; 7-cold water pipeline;

12-a pipe joint; 13-tube-in-tube inner tube; 14-tube-in-tube outer tube;

21-a water outlet valve body; 211-liquid outlet end; 212-tube-in-tube connection end; 213-a control terminal; 214-a second outer liquid inlet hole; 215-a damper chamber; 22-a damping piston; 23-a first restoring member; 24-a connecting tube; 241-delay seal; 25-piston guide rod; 26-a sealing sleeve; 27-a second restoring member; 28-hand wheel;

31-a valve core; 311-a first outer liquid inlet hole; 312-a spool mounting portion; 313-inner liquid inlet hole; 32-a piston; 33-a reset member; 34-a temperature control device; 341-temperature control seat; 342-a temperature sensitive medium; 343-temperature control rod; 35-an overflowing hole; 36-outer non-return structure; 38-a filter screen;

Detailed Description

The utility model is further described below with reference to specific examples:

as shown in fig. 1, a hot water circulation system with branch differential water outlet includes a main pipeline and a plurality of pipe-in-pipe pipelines disposed on the main pipeline. Wherein each room may be provided with a separate pipe-in-pipe line.

The main pipeline comprises a water heater 4, a main circulating pipe 5 and a circulating pump 6, and a main flow passage is arranged in the main circulating pipe 5. The liquid outlet of the water heater 4 is communicated with the liquid inlet of the circulating pump 6 through the main circulating pipe 5, and the liquid outlet of the circulating pump 6 is communicated with the liquid inlet of the circulating pump 6 through the main circulating pipe 5. In addition, a cold water pipeline 7 for supplement is also arranged on the water heater 4. When the circulating pump 6 works, hot water circulation of the main flow passage can be realized, and hot water supply of the branch passages is realized.

The pipe-in-pipe pipeline comprises a pipe-in-pipe 1, a pipe joint 12 and a delay water outlet valve 2 arranged on the pipe-in-pipe 1. The pipe-in-pipe 1 and the pipe joint 12 both comprise a pipe-in-pipe inner pipe 13, a pipe-in-pipe outer pipe 14 and a connecting part for connecting the pipe-in-pipe inner pipe and the pipe joint. An inner flow channel is formed in the tube-in-tube inner tube 13, an outer flow channel is formed between the tube-in-tube inner tube 13 and the tube-in-tube outer tube 14, and the inner flow channel and the outer flow channel are communicated with the main flow channel.

Wherein, postpone outlet valve 2 and be used for realizing that the interior runner is preferred to be gone out water, outer runner postpones out water, and its concrete structure is as follows:

the first embodiment is as follows:

as shown in fig. 2, the delay outlet valve 2 is a temperature-controlled delay outlet valve, and includes a temperature-controlled valve body and a temperature-controlled valve core.

In this embodiment, the temperature control valve body can be replaced by a pipe joint 12 with a threaded end, and the temperature control valve body at least comprises a connecting end for connecting the pipe in the pipe and a threaded end for installing the temperature control valve core, and the threaded end is also required to be provided with a common water tap for controlling the on-off of the delay water outlet valve 2. The fitting 12 is generally of the two-way type, which is generally disposed at the end of the tube-in-tube, or of the three-way type, which is generally disposed in the middle of the tube-in-tube.

As shown in fig. 3, the temperature control valve core includes a hollow valve core 31, a piston 32, a returning member 33, and a temperature control device 34.

The outer side of the valve core 31 is provided with a valve core mounting part 312 and a valve core sealing ring, and the valve core mounting part 312 is preferably an external thread which can be mounted at the threaded end of the pipe joint 12 and used for separating an internal flow passage and an external flow passage. A first outer liquid inlet hole 311 communicated with the outer flow passage is formed in the side wall of the valve core 31, and a filter screen 38 is arranged on the valve core 31 outside the first outer liquid inlet hole 311 or in the outer flow passage where the valve core is located, so that impurities are prevented from entering the temperature control valve core 3.

The piston 32 is movably arranged on the inner wall of the valve core 31 through a resetting piece 33 and is used for adjusting the liquid inlet amount of the first outer liquid inlet hole 311; the restoring member 33 is preferably a spring, and when no external force is applied, the restoring member 33 pushes the piston 32 against the first outer fluid inlet hole 311 and seals the first outer fluid inlet hole 311. Preferably, piston sealing rings are arranged at the upper end and the lower end of the piston 32.

The temperature control device 34 is preferably a temperature-sensitive wax packet, which is disposed on the valve core 31 communicating with the internal flow passage and drives the piston 32 to move, and specifically, the temperature control device 34 includes a temperature control seat 341 disposed on the valve core 31, a temperature-sensitive medium 342 and a temperature control rod 343 are disposed in the temperature control seat 341, and the temperature-sensitive medium 342 drives the temperature control rod 343 and the temperature control seat 341 to move relatively through volume change, so as to drive the piston 32. In this embodiment, the temperature control rod 343 is movably disposed on the temperature control seat 341, and the temperature control seat 341 is fixed on the fixing bracket in the middle of the valve core 31. An inner ring of the piston 32 is provided with an installation framework in an extending manner, and the installation framework is arranged at the end part of the temperature control seat 341 in a sliding manner and limits the limit position of the piston 32. In order to ensure the flow of liquid, a plurality of overflowing holes 35 are formed between the fixed bracket and the mounting framework.

In addition, the temperature control rod 343 may be fixed to a fixed bracket of the valve core 31, and the temperature control seat 341 is movably disposed on the temperature control rod 343, so as to achieve the purpose that the temperature control seat 341 drives the piston to move.

Because the initial position of the piston is to seal the first outer liquid inlet hole 311 (namely, the outer flow passage), when liquid is discharged, hot water is firstly discharged from the inner flow passage, the liquid discharge of the outer flow passage is delayed through the temperature control device 34, and the cold water discharge of the outer flow passage is delayed, so that a user can quickly use the hot water.

When the temperature control device 34 senses hot water, it drives the piston 32 to move a corresponding distance according to the temperature of the hot water, so as to adjust the liquid inlet amount of the first outer liquid inlet hole 311. Because the piston moves slowly, the temperature curve of the outlet water after the cold water of the outer flow passage is intersected with the hot water of the inner flow passage is more stable, and the comfortable water using experience of a user can be better achieved. Meanwhile, cold water of the outer channel is utilized, and water resources are saved.

In addition, when the temperature of the hot water sensed by the temperature control device 34 is lower, the moving distance of the piston 32 is shorter, and the liquid outlet amount of the first outer liquid inlet hole 311 is less; when the temperature of the hot water sensed by the temperature control device 34 is higher, the moving distance of the piston 32 is larger, the liquid outlet amount of the first outer liquid inlet hole 311 is increased, and the liquid outlet amount of the first outer liquid inlet hole is intersected with the hot water in the inner flow passage and then flows out together, so that the influence of the cold water temporarily stored in the outer flow passage on the temperature of the outlet water is greatly reduced.

Preferably, the piston 32 is made of ceramic, plastic or metal, and in this embodiment, the piston is made of plastic.

Preferably, the outer wall of the valve core 31 is provided with an outer check structure 36, the outer check structure 36 is an elastic membrane, and the outer check structure 36 is arranged on the outer flow passage to prevent backflow.

In order to facilitate the installation of the piston, the bottom of the valve core 31 is connected with a valve core cover in a threaded manner, and an inner liquid inlet hole 313 communicated with the inner flow passage is formed in the valve core cover.

Example two:

as shown in fig. 4, the present embodiment is substantially the same as the first embodiment, and the difference is that:

the temperature control valve core of the delayed water outlet valve 2' is arranged on the three-way pipe joint and used for delaying the liquid outlet of the outer flow passage. Specifically, the pipe joint is provided with two pipe-in-pipe connecting positions and a temperature control valve element mounting position, a pipe-in-pipe inner pipe is arranged in the middle of the two pipe-in-pipe connecting positions, and a mounting hole is formed in the middle of the pipe-in-pipe inner pipe, which is opposite to the temperature control valve element mounting position.

In this embodiment, the temperature control valve core is fixed in the temperature control valve core mounting position, so that the temperature control device 34 extends into the mounting hole.

In this embodiment, when the temperature control device 34 senses hot water, the piston moves upward, and the liquid in the outer flow channel enters from the first outer liquid inlet hole 311 on one side of the valve core 31 and flows out from the first outer liquid inlet hole 311 on the other side of the valve core 31, so as to form a delayed liquid outlet of the outer flow channel. And the outer end of the first outer liquid inlet hole 311 on the other side of the valve core 31 is provided with the outer check structure 36, and the outer check structure 36 is an elastic membrane.

Example three:

as shown in fig. 5, the delay outlet valve 2 ″ is a physical delay outlet valve, and includes an outlet valve body 21, the outlet valve body 21 is provided with an outlet end 211, a control end 213, and a tube-in-tube connection end 212, and the tube-in-tube connection end 212 is generally installed on a tube-in-tube pipeline through a pipe joint, and realizes delayed outlet of the tube-in-tube pipeline.

A control end 213 is arranged between the pipe-in-pipe connecting end 212 and the liquid outlet end 211, a control valve core and a hand wheel 28 for driving the control valve core to rotate are arranged in the control end 213, the control valve core is a common ceramic valve core, a ball valve core and the like in the market, and the control valve core is driven by the hand wheel 28 to realize liquid outlet control. In addition, in order to achieve the same control effect, the liquid outlet end 211 can be externally connected with a control valve.

The tube-in-tube connecting end 212 is provided with an inner flow passage of the communicating tube-in-tube inner tube 13 and an outer flow passage of the communicating tube-in-tube outer tube 14, and the liquid outlet end 211 is communicated with the inner flow passage and the outer flow passage through an inner cavity of the water outlet valve body 21. The pipe-in-pipe connection end 212 inboard is provided with the delay sealing portion 241 of the interior outer runner of separation, specifically, the connecting pipe 24 of the interior runner of being provided with of play water valve body 21, connecting pipe 24 stretch into the formation of play water valve body 21 inner chamber delay sealing portion 241, the outer feed liquor hole 214 of a plurality of seconds has been seted up on the play water valve body 21 in the connecting pipe 24 outside, the outer feed liquor hole 214 of second forms outer runner.

The inner cavity of the water outlet valve body 21 is provided with a damping piston 22 and a first reset piece 23 for providing elastic force, the first reset piece 23 is preferably a spring, and the spring in the embodiment is in a conical structure with a small upper part and a large lower part, so that the damping piston can stably move. The damping piston 22 is installed on the outer side wall of the delay sealing part 241 and realizes the outer flow passage sealing; when the internal medium pushes the damping piston 22 to separate the delay sealing part 241, the delay liquid outlet of the flow passage where the damping piston 22 is located is realized. In the mechanical delay valve, the length of the delay seal portion 241 is related to the delay time, and relatively speaking, the longer the length, the longer the delay time.

The sectional area of an inner flow passage of a pipe-in-pipe pipeline is smaller than that of an outer flow passage, so that the water storage capacity of the outer flow passage is large, the amount of cooled cold water is large, in order to reduce the hot water outlet time of a liquid outlet end, the inner flow passage is preferred to discharge water, namely, the damping piston 22 can seal the outer flow passage, and in a short water using time, the damping piston 22 prevents or delays the discharge of cold water in the outer flow passage, so that the expected effect is achieved.

In order to control the delay time of the flow channel, a closed damping cavity 215 is arranged in the water outlet valve body 21, specifically, a piston guide rod 25 is arranged in the water outlet valve body 21, the piston guide rod 25 is integrally formed on the upper valve body, the damping cavity 215 is arranged between the piston guide rod 25 and the inner wall of the water outlet valve body 21, and the piston guide rod 25 is provided with a middle flow channel for communicating the inner flow channel and the outer flow channel with the liquid outlet end 211. The damping chamber 215 is internally provided with the damping piston 22 and the first restoring member 23, and the damping chamber 215 is further internally provided with a damping adjusting flow passage. The damping adjusting flow passage is provided with a damping adjusting hole or a damping adjusting groove on the piston guide rod 25/the damping piston 22, or is a damping gap arranged between the end part of the damping piston 22 and the piston guide rod 25.

When no booster such as a water pump is driven in the hot water discharge system, the medium pressures of the inner flow passage and the outer flow passage are equal, the medium pressures at the two ends of the damping piston 22 are balanced through the damping adjusting flow passage, no extra medium pressure acts on the first resetting piece, and the first resetting piece acts on the damping piston 22 to realize the sealing of the outer flow passage.

When the valve core is opened, the inner flow channel discharges liquid, the pressure of the inner flow channel is reduced, the pressure in the damping cavity 215 is reduced along with the pressure, the balance is broken, and the damping piston 22 is slowly jacked open as long as the medium pressure of the outer flow channel is larger than the elastic force of the first resetting piece, so that liquid discharging is delayed. In this embodiment, the movement speed of the damping piston 22 is controlled by controlling the discharge of the medium in the damping chamber 215 through the damping adjustment flow passage, and the length of the delay sealing portion 241 is constant, thereby controlling the delay liquid discharge time of the outer flow passage. When the first reset piece is in a non-working state, the first reset piece cannot work under the load all the time due to the medium pressure, and the service life of the first reset piece is guaranteed.

Because the position after the rotatory fixed of every product can't be unified to threaded connection, this leads to connecting pipe and pipe-in-pipe pipeline junction leakproofness unstable, leads to the easy weeping of interior outer runner, consequently, the outside of connecting pipe 24 is provided with the joint bulge loop, and the joint bulge loop is provided with the sealing washer and the joint has movable sealing boot 26 and second piece 27 that resets, and the second resets the preferred spring of piece 27, movable sealing boot 26 butt is at the mounted position of pipe-in-pipe inner tube in the connecting pipe.

The delayed outlet valve structure of the three embodiments can be applied to different pipe-in-pipe pipelines according to requirements.

In addition, the above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.

Claims

1. The utility model provides a hot water circulating system of branch road differential play water which characterized in that:

the main pipeline comprises a water heater (4), a main circulating pipe (5) and a circulating pump (6), and a main flow passage is arranged in the main circulating pipe (5); the liquid outlet of the water heater (4) is communicated with the liquid inlet of the circulating pump (6) through the main circulating pipe (5), and the liquid outlet of the circulating pump (6) is communicated with the liquid inlet of the circulating pump (6) through the main circulating pipe (5);

the pipe-in-pipe pipeline comprises a pipe-in-pipe (1) and a delay water outlet valve (2) arranged on the pipe-in-pipe (1); the pipe-in-pipe (1) is provided with an inner flow passage and an outer flow passage, and the inner flow passage and the outer flow passage are both communicated with the main flow passage;

when the delay water outlet valve (2) is opened, the inner flow passage can preferentially discharge water, and the outer flow passage can delay water discharge.

2. The hot water circulating system with branch differential water outlet as claimed in claim 1, wherein: delay outlet valve (2) include temperature-sensing valve body and temperature-sensing valve core (3), and temperature-sensing valve core (3) include:

the valve core (31) is arranged in the temperature control valve body and used for separating the inner flow passage from the outer flow passage; a first outer liquid inlet hole (311) communicated with an outer flow channel is formed in the side wall of the valve core (31);

the piston (32) is movably arranged on the inner wall of the valve core (31) through a resetting piece (33) and is used for adjusting the liquid inlet amount of the first outer liquid inlet hole (311);

the temperature control device (34) is arranged on the valve core (31) communicated with the inner flow passage and is connected with the piston (32);

when the temperature control device (34) senses hot water, the piston (32) is driven to move for a corresponding distance according to the temperature of the hot water, and the liquid inlet amount of the first outer liquid inlet hole (311) is adjusted.

3. The bypass differential water outlet hot water circulation system according to claim 2, wherein: the temperature control device (34) comprises a temperature control seat (341) arranged on the valve core (31), a temperature sensing medium (342) and a temperature control rod (343) are arranged in the temperature control seat (341), the temperature sensing medium (342) drives the temperature control rod (343) and the temperature control seat (341) to move relatively through volume change, and the driving of the piston (32) is realized.

4. The bypass differential water outlet hot water circulation system according to claim 2, wherein: the piston (32) is made of ceramic, plastic or metal.

5. The bypass differential water outlet hot water circulation system according to claim 2, wherein: the outer wall of the valve core (31) is provided with an outer check structure (36), and the outer check structure (36) is arranged on the outer flow passage.

6. The bypass differential water outlet hot water circulation system according to claim 2, wherein: and a filter screen (38) is arranged on the valve core (31) at the outer side of the first outer liquid inlet hole (311) or in the outer flow passage.

7. The hot water circulating system with branch differential water outlet as claimed in claim 1, wherein: the delay water outlet valve (2) comprises a water outlet valve body (21), a water outlet end (211) and a pipe-in-pipe connecting end (212) are arranged on the water outlet valve body (21), an inner flow channel of a communication pipe-in-pipe inner pipe (13) and an outer flow channel of a communication pipe-in-pipe outer pipe (14) are arranged on the pipe-in-pipe connecting end (212), and the water outlet end (211) is communicated with the inner flow channel and the outer flow channel through an inner cavity of the water outlet valve body (21);

a delay sealing part (241) is arranged on the inner side of the pipe-in-pipe connecting end (212), a damping piston (22) and a first reset piece (23) for providing elasticity are arranged in the inner cavity of the water outlet valve body (21), and the damping piston (22) is installed on the outer side wall of the delay sealing part (241) and realizes the sealing/conduction of an outer flow passage;

when the internal medium pushes the damping piston (22) to separate the delay sealing part (241), the delay liquid outlet of the flow passage where the damping piston (22) is located is realized.

8. The bypass differential water outlet hot water circulation system according to claim 7, wherein: a damping cavity (215) is arranged in the water outlet valve body (21), the damping piston (22) and the first reset piece (23) are arranged in the damping cavity (215), and a damping adjusting flow channel is further arranged in the damping cavity (215).

9. The bypass differential water outlet hot water circulation system according to claim 7, wherein: a connecting pipe (24) with an internal flow channel is arranged on the water outlet valve body (21), and the connecting pipe (24) extends into the inner cavity of the water outlet valve body (21) to form the delay sealing part (241); a plurality of second outer liquid inlet holes (214) are formed in the water outlet valve body (21) on the outer side of the connecting pipe (24), and the second outer liquid inlet holes (214) are communicated with the outer flow channel.

10. A bypass differential water outlet hot water circulation system according to claim 9, wherein: the outer end of the connecting pipe (24) is clamped with a movable sealing sleeve (26) and a second resetting piece (27), and the movable sealing sleeve (26) is used for connecting a pipe-in-pipe inner pipe.