A delayed water outlet valve for pipe-in-pipe and hot water discharge system thereof

Abstract

The present invention belongs to the technical field of domestic water, and particularly refers to a delayed water outlet valve for a pipe-in-pipe and a hot water discharge system thereof, which comprises a water heater, a liquid inlet valve and a pipe-in-pipe pipeline, the branch end of the pipe-in-pipe pipeline is provided with a delayed water outlet valve through a pipe-in-pipe joint, the delayed water outlet valve comprises a valve body, a liquid outlet end and a pipe-in-pipe connecting end are provided on the valve body, an inner flow channel and an outer flow channel are provided on the pipe-in-pipe connecting end, the liquid outlet end is connected to the inner flow channel and the outer flow channel through the inner cavity of the valve body; a delayed sealing part for separating the inner and outer flow channels is provided on the inner side of the pipe-in-pipe connecting end, a damping piston and a first reset member providing elastic force are provided in the inner cavity of the valve body, the damping piston is installed on the outer side wall or the inner side wall of the delayed sealing part, and realizes the sealing of the outer flow channel or the inner flow channel; when the internal medium pushes the damping piston to separate the delayed sealing part, the delayed liquid discharge of the flow channel where the damping piston is located is realized. The present invention has the advantages of less cold water discharge and fast hot water discharge speed.

Description

Technical Field

[0001] The invention belongs to the technical field of domestic water, and in particular relates to a delayed water outlet valve for a pipe-in-pipe and a hot water discharge system thereof. Background Art

[0002] The pipe-in-pipe pipeline consists of a pipe-in-pipe and a pipe-in-pipe joint, both of which are composed of a pipe-in-pipe inner pipe forming an inner flow channel and a pipe-in-pipe outer pipe forming an outer flow channel. It has the advantages of easy installation and fast liquid discharge speed.

[0003] The utility model patent with application number CN201820054377.9 discloses a hot water circulation system, which includes a water heater, a circulation pump, a non-return type starting valve, a hot water pipeline composed of a hot water pipe and a pipe joint, and a tail valve connected to an external device. The liquid inlet end of the circulation pump is connected to the output end of the water heater, and its output end is connected to the non-return type starting valve; the hot water pipe is provided with a hot water flow channel connected to the liquid inlet cavity of the starting valve and a return water flow channel connected to the return flow cavity of the starting valve, and the hot water pipes are connected to each other through a pipe joint; the liquid outlet end of the hot water pipe is provided with a tail valve, and the tail valve includes a tail valve body, and the tail valve body is provided with a tail valve liquid inlet cavity connected to the hot water flow channel and a tail valve return flow cavity connected to the return flow channel, and the tail valve liquid inlet cavity and the tail valve return cavity can be connected to an external device. The present invention has the characteristics of energy saving and environmental protection, convenient pipeline layout, low cost, and rapid water discharge.

[0004] The above-mentioned hot water circulation system is mainly used in places with relatively large demand for hot water, such as villas, hotels, collective dormitories, etc. When the demand for hot water is relatively small, it is often not necessary to circulate it in order to save resources. Even so, the water outlet speed of the pipe-in-pipe pipeline is much higher than that of ordinary pipelines. However, due to the low frequency of hot water use, the hot water in the inner and outer flow channels is also easy to cool. When we encounter small water needs such as washing hands and faces, we still cannot experience hot water in time. Therefore, the applicant further shortens the hot water outlet time by delaying the outlet of the inner or outer flow channel, providing users with a better water experience.

[0005] The utility model patent with application number CN201820054377.9 discloses a delay valve, which includes a valve body with an oil inlet chamber and an oil outlet chamber, the valve body having an oil passage connected to the oil inlet chamber and an oil outlet connected to the oil outlet chamber, the oil outlet chamber is provided with a piston which divides the oil outlet chamber into an upper chamber and a lower chamber, the piston has an oil inlet hole and an oil return hole which connect the upper chamber and the lower chamber, the oil inlet chamber is connected with the lower chamber, one end of the piston located in the lower chamber is provided with a leather cup which abuts against the oil return hole and closes the oil return hole, an elastic part is provided in the upper chamber, the piston is an integrated structure, a sealing part is fixed to one end of the piston located in the lower chamber, the piston can move under the elastic force of the elastic part and make the sealing part abut against the bottom of the lower chamber to close the oil inlet hole.

[0006] Although the above structure discloses a delay structure, it still has the following problems:

[0007] 1. This structure is only suitable for delayed liquid discharge in a single channel, and is not suitable for application in tube-in-tube;

[0008] 2. The liquid outlet of this structure is set on the piston, which is only suitable for a small amount of liquid discharge and is not suitable for application in water pipes;

[0009] 3. The hydraulic chamber has a certain pressure. No matter it is in a low-pressure sealed state or a high-pressure open state, the spring will be acted on through the piston. The spring is always in a working state, which affects the service life of the spring. Summary of the invention

[0010] The object of the present invention is to provide a delayed water outlet valve which has a simple structure and can quickly discharge hot water, and a hot water discharge system thereof.

[0011] The object of the present invention is achieved in that:

[0012] A delayed water outlet valve for a pipe-in-pipe, comprising a valve body, a liquid outlet end and a pipe-in-pipe connecting end are provided on the valve body, an inner flow channel connected to an inner pipe of the pipe-in-pipe and an outer flow channel connected to an outer pipe of the pipe-in-pipe are provided on the pipe-in-pipe connecting end, and the liquid outlet end is connected to the inner flow channel and the outer flow channel through a valve body cavity;

[0013] A delay sealing part is provided inside the tube-in-tube connection end to separate the inner and outer flow channels, a damping piston and a first return member providing elastic force are provided in the inner cavity of the valve body, and the damping piston is installed on the outer side wall or the inner side wall of the delay sealing part to achieve sealing of the outer flow channel or the inner flow channel;

[0014] When the internal medium pushes the damping piston to separate the delayed sealing portion, delayed liquid discharge from the flow channel where the damping piston is located is achieved.

[0015] Preferably, a damping chamber is provided in the valve body, the damping piston and the first return member are provided in the damping chamber, and a damping adjustment channel communicating with the inner chamber of the valve body is further provided in the damping chamber.

[0016] Preferably, a piston guide rod is provided in the valve body, and the piston guide rod is provided with an intermediate flow channel connecting the inner and outer flow channels with the liquid outlet end; the damping chamber is provided between the piston guide rod and the inner wall of the valve body, or inside the piston guide rod.

[0017] Preferably, the damping adjustment flow channel is a damping adjustment hole or a damping adjustment groove provided on a piston guide rod / damping piston, or a damping gap provided between the damping piston end and the piston guide rod.

[0018] Preferably, a damping adjustment member is provided in the valve body, the inner end of the damping adjustment member is provided on the above-mentioned damping adjustment flow channel, and controls the size of the damping adjustment flow channel to achieve adjustment of the delay time.

[0019] Preferably, a filter screen is provided inside the damping adjustment channel.

[0020] Preferably, a first seal for sealing the damping chamber is provided at the upper end of the damping piston, or / and a second seal for sealing the delay seal portion is provided on the inner wall of the lower end of the damping piston.

[0021] Preferably, the valve body is provided with a connecting pipe with an internal flow channel, the connecting pipe extends into the inner cavity of the valve body to form the delayed sealing portion; a plurality of external liquid inlet holes are opened on the valve body outside the connecting pipe, and the external liquid inlet holes form the external flow channel.

[0022] Preferably, a movable sealing sleeve and a second reset member are clamped on the outer side of the connecting pipe, and the movable sealing sleeve is used for connecting the pipe-in-pipe and the pipe-in-pipe.

[0023] Preferably, a control end is provided between the tube-in-tube connecting end and the liquid outlet end, and a control valve core and a hand wheel for driving the control valve core to rotate are provided in the control end.

[0024] Preferably, the valve body comprises an upper valve body provided with a liquid outlet and a control end and a lower valve body provided with a tube-in-tube connecting end, and the outer side wall of the lower valve body is provided with a threaded connecting part connected to the tube-in-tube pipeline and a clamping part driving it to rotate.

[0025] Preferably, the tube-in-tube connecting end includes a connecting sleeve which is separately arranged at the end of the valve body, the delayed sealing portion is arranged in the middle of the connecting sleeve to form an inner flow channel, and a plurality of external liquid inlet holes forming an outer flow channel are arranged on its outer periphery, and the connecting sleeve abuts between the inner tube of the tube-in-tube and the damping piston.

[0026] Preferably, at least one reflux hole is formed at the sealed end of the damping piston, and a water return sheet is disposed on the outer side of the reflux hole.

[0027] Preferably, a piston bracket is provided on the damping piston, and the piston bracket includes an upper bracket arranged in the damping chamber and a lower bracket on which the damping piston is installed; when the damping piston seals the external flow channel, a liquid hole is provided on the piston bracket.

[0028] A hot water discharge system comprises a water heater, a liquid inlet valve and a pipe-in-pipe pipeline, wherein the branch end of the pipe-in-pipe pipeline is installed with the delayed water outlet valve through a pipe-in-pipe joint.

[0029] Preferably, a temperature control device is also provided in the valve body, and when the temperature control device senses hot water, the temperature control device drives the damping piston and opens the flow channel;

[0030] The temperature control device comprises a temperature control housing, in which a temperature sensing medium and a temperature control rod are arranged. The temperature sensing medium drives the temperature control rod and the temperature control housing to move relative to each other through volume change, thereby driving the damping piston.

[0031] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0032] 1. The present invention seals the inner and outer flow channels by a damping piston, and preferentially seals the outer flow channel with a larger cross-sectional area. When the user uses water, the inner flow channel discharges water first. Since the amount of cold water in the inner flow channel is relatively small, the water discharge speed is relatively fast. At this time, if the water is used for a short time, the outer flow channel is generally not opened, which can save water for the discharge of a part of the cold water in the outer flow channel and save the time for the discharge of this part of the cold water. After a certain period of time, the medium in the outer flow channel will slowly drive the damping piston to open the outer flow channel, and the outer flow channel and the inner flow channel will discharge water together. At first, the hot water in the outer flow channel will neutralize the hot water in the inner flow channel, and the temperature is moderate, which will not affect the user's use. The user can experience hot water with a normal water output in a few seconds, which can meet the large demand for water. In this process, the cold water in the outer flow channel that originally needed to be emptied was utilized, reducing the waste of water resources.

[0033] 2. The present invention is provided with a damping chamber, and a damping adjustment flow channel is provided in the damping chamber to accurately control the moving speed of the damping piston and realize delayed liquid discharge.

[0034] 3. The damping adjustment channel of the present invention is provided with a damping adjustment member, which is convenient for adjusting the delay time at any time according to needs and is easy to operate.

[0035] 4. The damping piston of the present invention is provided with a reflux hole and a water return plate, which can release pressure and reflux when the inner flow channel is under high pressure, thereby protecting the equipment and the discharge system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is a structural schematic diagram of a first embodiment of the delayed liquid discharge from the outer flow channel of the present invention.

[0037] Figure 2 It is one of the cross-sectional views of the first embodiment of the present invention.

[0038] Figure 3 This is the second cross-sectional view of the first embodiment of the present invention.

[0039] Figure 4 It is a structural schematic diagram of a second embodiment of the delayed liquid discharge from the outer flow channel of the present invention.

[0040] Figure 5 It is a cross-sectional view of a second embodiment of the present invention.

[0041] Figure 6 It is an exploded view of the second embodiment of the present invention.

[0042] Figure 7 It is a reference diagram of the sealing state of the third embodiment of the delayed liquid discharge from the outer flow channel of the present invention.

[0043] Figure 8 It is a reference diagram of the open state of the third embodiment of the delayed liquid discharge of the outer flow channel of the present invention.

[0044] Fig. 9 yes Figure 7 Cross-sectional view of the damping adjustment channel at AA in the middle.

[0045] Fig.10 It is a structural schematic diagram of a fourth embodiment of the delayed liquid discharge from the outer flow channel of the present invention.

[0046] Fig.11 yes Fig.10 Cross-section of the piston support at the middle BB.

[0047] Fig.12 It is a structural schematic diagram of a fifth embodiment of the internal flow channel delayed liquid discharge of the present invention.

[0048] Fig.13 It is a structural schematic diagram of the hot water discharge system of the present invention.

[0049] Fig.14 It is a structural schematic diagram of the first temperature control valve of the present invention.

[0050] Fig.15 It is a cross-sectional view of the first temperature control valve of the present invention.

[0051] Fig.16 It is a schematic diagram of the installation structure of the temperature control device of the present invention.

[0052] The meaning of the symbols in the figure:

[0053] 1-valve body; 2-damping piston; 3-first reset member; 4-delay sealing part;

[0054] 11-liquid outlet; 12-tube-in-tube connection end; 13-control end; 14-inner flow channel; 15-outer flow channel; 16-outer liquid inlet hole; 17-valve core; 18-hand wheel;

[0055] 21-damping chamber; 22a-damping adjustment hole; 22b-damping adjustment groove; 23-piston guide rod; 24-middle flow channel;

[0056] 25-damping adjustment member; 26-filter; 27-first sealing member; 28-second sealing member;

[0057] 31-connecting pipe; 32-sealing sleeve; 33-second reset member;

[0058] 41-upper valve body; 42-lower valve body; 43-threaded connection part; 44-clamping part;

[0059] 51-connecting sleeve; 52-return hole; 53-return sheet;

[0060] 61-piston support; 62-liquid hole;

[0061] 71-temperature control housing; 72-temperature sensing medium; 73-temperature control rod; 74-temperature control mounting seat; 74a-seat body; 74b-support; 75-pin;

[0062] 81-liquid inlet hole; 82-return hole; 83-water return part; 84-inner tube installation part; 85-inner flow hole;

[0063] 100-delayed water outlet valve; 101-water heater; 102-liquid inlet valve; 103-pipe-in-pipe pipeline; 104-inner pipe in pipe-in-pipe; 105-outer pipe in pipe-in-pipe; 106-delayed temperature control valve; 111-hot water pipe; 112-cold water pipe. DETAILED DESCRIPTION

[0064] The present invention will be further described below in conjunction with specific embodiments:

[0065]

Delayed water outlet valve

[0066] Embodiment 1:

[0067] like Figure 1-3As shown, a delayed water outlet valve for a pipe-in-pipe includes a valve body 1, on which a liquid outlet 11, a control end 13 and a pipe-in-pipe connecting end 12 are provided. The pipe-in-pipe connecting end 12 is generally installed on a pipe-in-pipe pipeline through a pipe-in-pipe joint, and realizes delayed liquid outlet of the pipe-in-pipe pipeline. A control end 13 is provided between the pipe-in-pipe connecting end 12 and the liquid outlet 11, and a control valve core 17 and a handwheel 18 for driving the control valve core 17 to rotate are provided in the control end 13. The valve core 17 is a common ceramic valve core, ball head valve core, etc. on the market, and the valve core is driven by the handwheel 18 to realize liquid outlet control. In addition, in order to achieve the same control effect, the liquid outlet 11 can be externally connected to a control valve.

[0068] In order to facilitate the installation of the inner cavity parts, the valve body 1 is arranged in a split body, that is, the valve body 1 includes an upper valve body 41 provided with a liquid outlet end 11 and a control end 13, and a lower valve body 42 provided with a tube-in-tube connecting end 12, and the two are threadedly connected. The outer side wall of the lower valve body 42 is provided with a threaded connection part 43 connecting the tube-in-tube pipeline and a clamping part 44 driving it to rotate, and the clamping part 44 is generally multi-deformable.

[0069] like Figure 2 As shown, the tube-in-tube connection end 12 is provided with an inner flow channel 14 connecting the inner tube 104 in the tube-in-tube and an outer flow channel 15 connecting the outer tube 105 in the tube-in-tube, and the liquid outlet end 11 is connected with the inner flow channel 14 and the outer flow channel 15 through the inner cavity of the valve body 1. In this embodiment, the outer diameter of the lower valve body 42 is larger than the tube-in-tube connection end 12, so that the damping piston 2 has a larger installation space in the lower valve body 42. A delay sealing portion 4 is provided on the inner side of the tube-in-tube connection end 12 to separate the inner and outer flow channels. Specifically, the valve body 1 is provided with a connecting pipe 31 with an inner flow channel 14, and the connecting pipe 31 extends into the inner cavity of the valve body 1 to form the delay sealing portion 4. A plurality of external liquid inlet holes 16 are opened on the valve body 1 outside the connecting pipe 31, and the external liquid inlet holes 16 form the external flow channel 15.

[0070] The inner cavity of the valve body 1 is provided with a damping piston 2 and a first reset member 3 providing elastic force. The first reset member 3 is preferably a spring, and the spring in this embodiment is a conical structure with a small top and a large bottom, which is conducive to the stable movement of the damping piston. The damping piston 2 is installed on the outer wall or the inner wall of the delay sealing part 4, and realizes the sealing of the outer flow channel 15 or the inner flow channel 14; when the internal medium pushes the damping piston 2 to separate the delay sealing part 4, the delayed discharge of the flow channel where the damping piston 2 is located is realized. In a mechanical delay valve, the length of the delay sealing part 4 is related to the delay time. Relatively speaking, the longer its length, the longer the delay time.

[0071] Generally, the cross-sectional area of ​​the inner flow channel of a pipe-in-pipe pipeline is smaller than that of the outer flow channel. Therefore, the water storage capacity of the outer flow channel is relatively large, and the volume of cold water after cooling is also relatively large. In order to reduce the hot water outlet time at the liquid outlet, the inner flow channel is given priority, that is, the damping piston 2 will seal the outer flow channel. During a short period of water use, the damping piston 2 will prevent or delay the discharge of cold water inside the outer flow channel to achieve the expected effect.

[0072] In order to control the delay time of the flow channel, a closed damping chamber 21 is provided in the valve body 1. Specifically, a piston guide rod 23 is provided in the valve body 1. The piston guide rod 23 is integrally formed on the upper valve body. The damping chamber 21 is provided between the piston guide rod 23 and the inner wall of the valve body 1, and the piston guide rod 23 is provided with an intermediate flow channel 24 connecting the inner and outer flow channels with the liquid outlet end 11. The damping piston 2 and the first reset member 3 are provided in the damping chamber 21. The damping chamber 21 is also provided with a damping adjustment flow channel connected to the inner cavity of the valve body 1. The damping adjustment flow channel is provided with a damping adjustment hole 22a or a damping adjustment groove 22b on the piston guide rod 23 / damping piston 2, or is a damping gap provided between the end of the damping piston 2 and the piston guide rod 23.

[0073] like Figure 3 As shown, in this embodiment, the damping adjustment channel is a damping adjustment hole 22a, and the valve body 1 is internally threaded with a damping adjustment member 25, the inner end of which is tapered and arranged on the damping adjustment channel, and the size of the damping adjustment channel is controlled by rotating the damping adjustment member 25 to adjust the delay time. In order to prevent impurities from entering the damping chamber 21, a filter screen 26 is arranged on the inner side of the damping adjustment channel, and the filter screen 26 is arranged in the annular groove in the valve body and fixed by the valve core.

[0074] In order to improve the sealing performance, a first sealing member 27 for sealing the damping chamber 21 is provided at the upper end of the damping piston 2 , and / or a second sealing member 28 for sealing the delayed sealing portion 4 is provided on the inner wall of the lower end of the damping piston 2 .

[0075] When there is no boosting equipment such as a water pump to drive the hot water discharge system, the medium pressures in the inner flow channel and the outer flow channel are equal. The damping adjusting channel is used to balance the medium pressures at both ends of the damping piston 2. No additional medium pressure acts on the first reset member. The first reset member acts on the damping piston 2 to achieve sealing of the outer flow channel.

[0076] When the valve core is opened, liquid flows out of the inner flow channel, the pressure of the inner flow channel drops, and the pressure in the damping chamber 21 also drops accordingly, the balance is broken, and as long as the medium pressure in the outer flow channel is greater than the elastic force of the first reset member, the damping piston 2 will be slowly pushed open to achieve delayed liquid discharge. In this embodiment, the movement speed of the damping piston 2 is controlled by controlling the discharge of the medium in the damping chamber 21 through the damping adjustment channel, and the length of the delayed sealing portion 4 is constant, thereby controlling the delayed liquid discharge time of the outer flow channel. In the non-working state, the first reset member will not be constantly working under load due to the medium pressure, thereby ensuring the service life of the first reset member.

[0077] Since the threaded connection cannot unify the position of each product after rotation and fixing, this leads to unstable sealing at the connection between the connecting pipe and the tube-in-tube pipeline, which makes the internal and external flow channels leak easily. Therefore, a clamping convex ring is provided on the outer side of the connecting pipe 31, and the clamping convex ring is provided with a sealing ring and is clamped with a movable sealing sleeve 32 and a second reset member 33. The second reset member 33 is preferably a spring, and the movable sealing sleeve 32 abuts against the installation position of the tube-in-tube connecting pipe.

[0078] Embodiment 2

[0079] like Figure 4-6 As shown, this embodiment is basically the same as the first embodiment, and the difference is that: the piston guide rod 23 is separately arranged in the integrally formed valve body 1, specifically, the middle part of the piston guide rod 23 is axially provided with an intermediate flow channel 24, and the upper end thereof is provided with a mounting flange, the upper end of the mounting flange abuts against the through hole of the valve body 1, and the lower end thereof abuts against the first reset member 3. The other end of the first reset member 3 abuts against the damping piston 2, and the sealing end of the damping piston 2 is provided with at least one reflux hole 52, and the outer side of the reflux hole 52 is provided with a water return sheet 53. When the pressure in the inner flow channel is relatively high, pressure relief and reflux can be achieved through the reflux hole 52.

[0080] Preferably, the damping adjustment channel of the present embodiment is provided with a damping adjustment groove 22b on the piston guide rod 23. Although the size of the damping adjustment groove 22b has been set at the factory, the manufacturer can set corresponding product models according to the damping adjustment grooves 22b of different sizes to meet the needs of different application scenarios.

[0081] Preferably, the tube-in-tube connection end 12 includes a connection sleeve 51 which is separately arranged at the end of the valve body 1, the delay sealing portion 4 is arranged in the middle of the connection sleeve 51 to form an inner flow channel 14, and a plurality of outer liquid inlet holes 16 forming an outer flow channel 15 are arranged on its outer periphery, and the connection sleeve 51 abuts between the inner tube 104 of the tube-in-tube and the damping piston 2. The inner end of the connection sleeve 51 is also provided with a first mounting convex ring, which abuts on the return water sheet 53, and a gap is formed between the mounting convex ring and the inner end of the return water sheet 53 for the return water sheet 53 to open and close. The outer end of the connection sleeve 51 is provided with a second mounting convex ring, which is sleeved on the step portion of the inner tube of the tube-in-tube to achieve fixing and sealing effects.

[0082] Embodiment 3

[0083] like Figure 7-9 As shown, this embodiment is basically the same as the first embodiment, and the difference is that: the piston guide rod 23 is separately arranged in the integrally formed valve body 1. Specifically, an intermediate flow channel 24 is axially opened in the middle of the piston guide rod 23, and a mounting convex edge is arranged at its upper end. The mounting convex edge is installed on the step surface of the valve body through the valve core, and a sealing gasket is arranged between the mounting convex edge and the valve core. A sliding convex ring is arranged outward at the lower end of the piston guide rod 23, and a damping adjustment hole 22a is opened on the sliding convex ring. The sliding convex ring reduces friction by reducing the contact area between the damping piston 2; at the same time, the sliding convex ring can form a gap between the damping piston 2 and the piston guide rod 23, which is convenient for the damping adjustment hole 22a to discharge liquid.

[0084] Embodiment 4

[0085] like Figure 10-11 As shown, this embodiment is basically the same as the third embodiment, except that the damping chamber 21 and the first reset member 3 are both arranged inside the piston guide rod 23. The damping piston 2 is provided with a piston bracket 61, and the piston bracket 61 includes an upper bracket arranged in the damping chamber 21 and a lower bracket for mounting the damping piston 2; the upper bracket is movably arranged in the damping chamber 21 through the first sealing member, and a damping adjustment hole 22a is also provided in the damping chamber 21.

[0086] In order to facilitate the flow of the medium, when the damping piston 2 seals the outer flow channel 15 , a plurality of liquid holes 62 are provided on the piston support 61 .

[0087] Embodiment 5

[0088] like Fig.12As shown, this embodiment is basically the same as the fourth embodiment, and the difference is that: the damping piston 2 is installed on the inner surface of the delayed sealing part, that is, the sealed inner flow channel; the other end is movably arranged in the damping chamber 21 in the piston guide rod 23, and the two ends are movably sealed by the first seal 27 and the second seal 28 respectively. In order to limit the position, a limiting convex ring is arranged in the middle of the damping piston 2.

[0089] A plurality of intermediate holes are circumferentially formed on the mounting convex edge of the piston guide rod 23 to form an intermediate flow channel 24 connected to the liquid outlet end.

[0090]

Hot water discharge system

[0091] A hot water discharge system includes a water heater 101, a liquid inlet valve 102 and a pipe-in-pipe pipeline 103, wherein the branch end of the pipe-in-pipe pipeline 103 is installed with the delayed water outlet valve 100 of the above-mentioned embodiments 1 to 5 through a pipe-in-pipe joint. The hot water pipe 111 of the water heater 101 is connected to the pipe-in-pipe pipeline 103 through the liquid inlet valve 102, wherein the liquid inlet valve 102 is a common angle valve, and the connection between the inner and outer flow channels can be achieved through the pipe-in-pipe joint. The water heater 101 is also provided with a cold water pipe 112 for water replenishment, and the cold water pipe 112 is connected to the tap water pipe.

[0092] A delayed temperature control valve 106 may also be provided at the end of the branch, and its basic structure is similar to that of the delayed water outlet valve 100, except that:

[0093] like Figure 14-16 As shown, a temperature control mounting seat 74 is provided in the middle of the tube-in-tube connection end 12, and a temperature control device, a piston bracket 61, and a first reset member 3 are provided on the temperature control mounting seat 74. Specifically, the temperature control mounting seat 74 includes a seat body 74a for mounting the temperature control device, and a plurality of supports 74b are extended from the end of the seat body 74a, and the piston bracket 61 and the first reset member 3 are movably provided between the supports 74b, and a latch 75 for fixing the first reset member 3 is also provided at the upper end of the support 74b. The piston bracket 61 is two intersecting U-shaped frames, and the intersecting gap is just stuck on the support 74b to prevent it from rotating. A damping piston 2 is provided at the end of the piston bracket 61, and the first reset member 3 makes the damping piston 2 abut against the outer flow channel through the piston bracket 61.

[0094] The temperature control device includes a temperature control housing 71, in which a temperature-sensitive medium 72 and a temperature control rod 73 are arranged. The temperature-sensitive medium 72 is preferably wax, that is, a temperature-sensitive wax bag. The temperature-sensitive medium 72 drives the temperature control rod 73 and the temperature control housing 71 to move relative to each other through volume changes, and realizes the driving of the damping piston. That is, when the valve core is opened, the inner flow channel first discharges liquid, and the first thing discharged is a small part of the cold water in the inner flow channel, and then it quickly turns into hot water after 3-5 seconds to meet the user's demand for less water. After a period of time, when the temperature control device senses hot water at the set temperature, the temperature control device drives the damping piston and opens the flow channel, and the hot water flow rate increases to meet the user's demand for a larger amount of water. Since the volume change of the temperature-sensitive medium 72 is relatively slow, when the damping piston is opened, the water volume increases slowly, and will not cause large water outlet fluctuations at the liquid outlet.

[0095] The damping piston of this embodiment seals the external flow channel. The tube-in-tube connection end 12 includes an inner tube mounting portion 84 connected to the inner tube of the tube-in-tube. A sealing ring is provided at the connection between the inner tube mounting portion 84 and the inner tube of the tube-in-tube to prevent leakage of the inner flow channel. An inner flow channel and a plurality of inner flow holes 85 are also provided in the inner tube mounting portion 84. A liquid inlet hole 81 is provided on the outer periphery of the inner tube mounting portion 84. The inner flow channel is connected to the liquid outlet end through the inner flow hole 85 and the liquid inlet hole 81. The temperature control device is installed at the inner end of the inner tube mounting portion 84, and the piston bracket 61 passes through the liquid inlet hole 81 to connect to the damping piston 2 on the outside.

[0096] In addition, when the valve core is closed, the medium pressures of the inner and outer channels are equal. When the damping piston 2 is sealed, the inner channel pressure on one side and the outer channel pressure on the other side are exactly offset, so that the medium pressures at both ends of the damping piston 2 are balanced, and no additional action is applied to the first reset member. The first reset member can seal the outer channel by lightly damping the piston 2, thereby increasing the service life of the first reset member. In order to ensure the control effect of the temperature control device, the elastic force provided by the first reset member will be greater than the internal medium pressure to prevent the pressure from dropping when the inner channel is opened, and the outer channel from opening automatically.

[0097] In this embodiment, the outer flow channel is composed of the inner tube mounting portion 84 and the inner cavity of the tube-in-tube joint. The damping piston 2 is mounted on the inner tube mounting portion 84, and its outer side wall protrudes outward to form a piston blocking portion. The piston blocking portion abuts against the step surface of the tube-in-tube joint to achieve a limit seal.

[0098] Preferably, at least one reflux hole 82 is provided on the side wall of the damping piston 2, and a water return portion 83 is provided at its sealed end. When the water pressure in the inner flow channel is too high, pressure relief and reflux can be achieved through the reflux hole 82 and the water return portion 83.

[0099] In order to facilitate the installation of the inner cavity parts, the valve body 1 is arranged in a split body, that is, the valve body 1 includes an upper valve body provided with a liquid outlet end 11 and a control end 13 and a lower valve body provided with a tube-in-tube connecting end 12, and the two are threadedly connected. The outer side wall of the lower valve body is provided with a threaded connection part 43 connecting the tube-in-tube pipeline and a clamping part 44 driving it to rotate.

[0100] In addition, in the temperature-controlled delay valve, since the delay time is controlled by the temperature control device, there is no need to rely on the delay sealing part 4 to control the time. Therefore, the delay sealing part 4 here refers to the part that enables the damping piston 2 to seal the flow channel, which can be a plane or an inner and outer side wall. In this embodiment, the delay sealing part 4 is the outer side wall of the inner tube mounting part 84 and the inner side wall of the pipe joint in the pipe.

[0101] Preferably, the cold water pipe 112 can also be connected to the end of the main branch of the pipe-in-pipe pipeline through a three-way joint to achieve hot water circulation.

[0102] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A delayed water outlet valve for a pipe-in-pipe, comprising a valve body (1), the valve body (1) being provided with a liquid outlet end (11) and a pipe-in-pipe connecting end (12), characterized in that: The tube-in-tube connecting end (12) is provided with an inner flow channel (14) connected to the inner tube (104) of the tube-in-tube and an outer flow channel (15) connected to the outer tube (105) of the tube-in-tube, and the liquid outlet end (11) is connected to the inner flow channel (14) and the outer flow channel (15) through the inner cavity of the valve body (1); A delayed sealing portion (4) is arranged inside the tube-in-tube connection end (12), a damping piston (2) and a first return member (3) providing elastic force are arranged in the inner cavity of the valve body (1), and the damping piston (2) is installed on the outer wall or the inner wall of the delayed sealing portion (4) to achieve sealing of the outer flow channel (15) or the inner flow channel (14); The valve body (1) is provided with a connecting pipe (31) with an inner flow channel (14), and the connecting pipe (31) extends into the inner cavity of the valve body (1) to form the delayed sealing portion (4); The valve body (1) is provided with a damping chamber (21), and the damping piston (2) and the first return member (3) are provided in the damping chamber (21); When the internal medium pushes the damping piston (2) to separate the delayed sealing portion (4), delayed liquid discharge from the flow channel where the damping piston (2) is located is achieved.

2. A delayed water outlet valve for a pipe-in-pipe according to claim 1, characterized in that: The damping chamber (21) is also provided with a damping adjustment flow channel communicating with the inner chamber of the valve body (1).

3. A delayed water outlet valve for a pipe-in-pipe according to claim 2, characterized in that: A piston guide rod (23) is arranged inside the valve body (1), and the piston guide rod (23) is provided with an intermediate flow channel (24) connecting the inner and outer flow channels with the liquid outlet end (11); the damping chamber (21) is arranged between the piston guide rod (23) and the inner wall of the valve body (1), or inside the piston guide rod (23).

4. A delayed water outlet valve for a pipe-in-pipe according to claim 3, characterized in that: The damping adjustment flow channel is a damping adjustment hole (22a) or a damping adjustment groove (22b) or a damping gap; The damping adjustment hole (22a) or the damping adjustment groove (22b) is arranged on the piston guide rod (23) or the damping piston (2), The damping gap is arranged between the end of the damping piston (2) and the piston guide rod (23).

5. A delayed water outlet valve for a pipe-in-pipe according to any one of claims 2 to 4, characterized in that: The valve body (1) is provided with a damping adjustment member (25), the inner end of which is arranged on the damping adjustment flow channel and controls the size of the damping adjustment flow channel to achieve adjustment of the delay time.

6. A delayed water outlet valve for a pipe-in-pipe according to claim 5, characterized in that: A filter screen (26) is arranged inside the damping adjustment flow channel.

7. A delayed water outlet valve for a pipe-in-pipe according to claim 1, characterized in that: A plurality of external liquid inlet holes (16) are provided on the valve body (1) outside the connecting pipe (31), and the external liquid inlet holes (16) form the external flow channel (15).

8. The delayed water outlet valve for a pipe-in-pipe according to claim 1, characterized in that: A movable sealing sleeve (32) and a second reset member (33) are clamped on the outer side of the connecting pipe (31), and the movable sealing sleeve (32) is used for connecting a pipe-in-pipe and a pipe-in-pipe.

9. A delayed water outlet valve for a pipe-in-pipe according to claim 1, characterized in that: A control end (13) is provided between the tube-in-tube connection end (12) and the liquid outlet end (11), and a control valve core (17) and a hand wheel (18) for driving the control valve core (17) to rotate are provided in the control end (13); The valve body (1) comprises an upper valve body (41) provided with a liquid outlet end (11) and a control end (13), and a lower valve body (42) provided with a tube-in-tube connecting end (12); the outer side wall of the lower valve body (42) is provided with a threaded connection portion (43) connected to a tube-in-tube pipeline and a clamping portion (44) for driving the lower valve body (42) to rotate.

10. A delayed water outlet valve for a pipe-in-pipe according to any one of claims 1 to 4 or 9, characterized in that: The tube-in-tube connection end (12) comprises a connection sleeve (51) which is separately arranged at the end of the valve body (1); the delay sealing portion (4) is arranged in the middle of the connection sleeve (51) to form an inner flow channel (14); a plurality of external liquid inlet holes (16) are arranged on the outer periphery of the connection sleeve to form an outer flow channel (15); the connection sleeve (51) is abutted between the tube-in-tube inner tube (104) and the damping piston (2).

11. A delayed water outlet valve for a pipe-in-pipe according to claim 10, characterized in that: At least one reflux hole (52) is provided at the sealed end of the damping piston (2), and a water return plate (53) is provided on the outer side of the reflux hole (52).

12. A delayed water outlet valve for a pipe-in-pipe according to any one of claims 1 to 4 or 9, characterized in that: The damping piston (2) is provided with a piston support (61), and the piston support (61) comprises an upper support arranged in the damping chamber (21) and a lower support on which the damping piston (2) is mounted; when the damping piston (2) seals the external flow channel (15), a liquid hole (62) is provided on the piston support (61).

13. A hot water discharge system, comprising a water heater (101), a liquid inlet valve (102) and a pipe-in-pipe pipeline (103), characterized in that: The branch end of the pipe-in-pipe pipeline (103) is installed with a delayed water outlet valve (100) as claimed in any one of claims 1 to 12 via a pipe-in-pipe joint.

14. A hot water discharge system according to claim 13, characterized in that: A temperature control device is also provided in the valve body (1). When the temperature control device senses hot water, the temperature control device drives the damping piston (2) and opens the flow channel. The temperature control device comprises a temperature control housing (71), a temperature-sensitive medium (72) and a temperature control rod (73) are arranged in the temperature control housing (71), and the temperature-sensitive medium (72) drives the temperature control rod (73) and the temperature control housing (71) to move relative to each other through volume change, thereby realizing the driving of the damping piston.

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