CN112254348A - Zero-cold-water supply system, combination valve, control method of water supply system and water heater - Google Patents
Zero-cold-water supply system, combination valve, control method of water supply system and water heater Download PDFInfo
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- CN112254348A CN112254348A CN201910669287.XA CN201910669287A CN112254348A CN 112254348 A CN112254348 A CN 112254348A CN 201910669287 A CN201910669287 A CN 201910669287A CN 112254348 A CN112254348 A CN 112254348A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
Abstract
The invention discloses a zero-cold-water supply system, a combination valve, a control method of the zero-cold-water supply system and a water heater, wherein the zero-cold-water supply system comprises the following components: a circulation pump; the water inlet end of the hot water pipe is communicated with the water outlet of the circulating pump, and the water outlet end of the hot water pipe is communicated with water using equipment; one end of the cold water pipe is communicated with a water inlet of the circulating pump, and the other end of the cold water pipe is communicated with a water outlet end of the hot water pipe, so that the circulating pump, the hot water pipe and the cold water pipe form a circulating water path; the temperature control valve is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe; the flow detector is used for detecting the water flow in the circulating water path; and the controller is electrically connected with the flow detector to control the circulating pump according to a detection signal of the flow detector. The zero-cold-water supply system enables a user to use hot water of the hot water pipe through the water taking equipment in time, and improves user experience, so that the practicability of the water heater is improved.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a zero-cold-water supply system, a combination valve, a control method of the zero-cold-water supply system and a water heater.
Background
Some water can be reserved in the water outlet pipeline after the water heater is used for each time, when the water heater is used for the next time, the water in the water outlet pipeline is cooled to become cold water, a user can use hot water after all the cold water in the water outlet pipeline is discharged, water is wasted, and inconvenience is brought to the user. At present, a method for solving the problem of cold water in a pipeline is to add a water pump in a water heater and circularly heat the cold water in the pipeline before people bathe, so that the effect of zero cold water is achieved. However, in practical application, because the pipeline of the hot water pipe is long, the temperature of hot water flowing from the heat exchange part to the water using part can be reduced, so that a user can not accurately judge whether the water using part reaches the required temperature, the experience effect of the user is influenced, and the practicability of the water heater is reduced.
Disclosure of Invention
The invention mainly aims to provide a zero-cold-water supply system, aiming at solving the technical problem of improving the practicability of a water heater.
In order to achieve the above object, the present invention provides a zero-cold water supply system, comprising:
a circulation pump;
the water inlet end of the hot water pipe is communicated with the water outlet of the circulating pump, and the water outlet end of the hot water pipe is communicated with water using equipment;
one end of the cold water pipe is communicated with a water inlet of the circulating pump, and the other end of the cold water pipe is communicated with a water outlet end of the hot water pipe, so that the circulating pump, the hot water pipe and the cold water pipe form a circulating water path;
the temperature control valve is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe;
a flow detector for detecting a flow of water in the circulating water path;
and the controller is electrically connected with the flow detector and used for controlling the circulating pump according to a detection signal of the flow detector.
Optionally, the valve opening of the thermostatic valve is inversely related to the water temperature.
Optionally, one end of the cold water pipe communicated with the water pump is further communicated with a water source, and one end of the cold water pipe communicated with the hot water pipe is further communicated with water utilization equipment.
Optionally, the zero-cold-water supply system further includes a check valve disposed on the circulation water path, and the check valve is conducted from the water outlet end of the hot water pipe toward the cold water pipe.
Optionally, the zero-cold-water supply system further comprises an H valve arranged in the circulating water path, the H valve comprises a first straight pipe, a second straight pipe and a transverse pipe for communicating the first straight pipe with the second straight pipe, the hot water pipe is communicated with the water using equipment through the first straight pipe, the hot water pipe is communicated with the cold water pipe through the transverse pipe, and the cold water pipe is communicated with the water using equipment through the second straight pipe; the temperature control valve is arranged on the transverse pipe.
The invention also proposes a combination valve comprising:
the H valve comprises a first straight pipe, a second straight pipe and a transverse pipe for communicating the first straight pipe with the second straight pipe;
and the temperature control valve is arranged on the transverse pipe so as to control the water flux of the transverse pipe along with the change of the water temperature.
Optionally, the temperature control valve includes a valve body connected to the horizontal tube, the valve body has a valve cavity communicated with the horizontal tube, the temperature control valve further includes a memory material spring disposed in the valve cavity, and a piston connected to a tail end of the memory material spring, and the memory material spring can extend and retract along with a change of water temperature, so that the piston enters the horizontal tube or retracts into the valve cavity.
Optionally, one end of the piston, which is far away from the memory material spring, is provided with a water through hole communicated with the valve cavity.
Optionally, the combination valve further comprises a one-way valve provided in the cross tube.
The invention also provides a control method of the zero-cold-water supply system, wherein the zero-cold-water supply system comprises the following steps:
a circulation pump;
the water inlet end of the hot water pipe is communicated with the water outlet of the circulating pump, and the water outlet end of the hot water pipe is communicated with water using equipment;
one end of the cold water pipe is communicated with a water inlet of the circulating pump, and the other end of the cold water pipe is communicated with a water outlet end of the hot water pipe, so that the circulating pump, the hot water pipe and the cold water pipe form a circulating water path;
the temperature control valve is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe;
a flow detector for detecting a flow of water in the circulating water path; and
the heat exchange device is used for exchanging heat with the water in the circulating water channel;
the control method of the zero-cold water supply system comprises the following steps:
starting the circulating pump and the heat exchange device;
acquiring a first flow rate;
acquiring a second flow after a first preset time;
the opening degree of the temperature control valve is positively correlated with the water temperature, the second flow is determined to be larger than the first flow, and the circulating pump is closed;
or the opening degree of the temperature control valve is inversely related to the water temperature, the second flow is determined to be smaller than the first flow, and the circulating pump is closed.
Optionally, the step of determining that the second flow rate is greater than or less than the first flow rate comprises:
calculating a first difference between the first flow rate and the second flow rate;
comparing the first difference value with a preset threshold value;
and determining that the first difference is greater than or equal to the preset threshold value, and turning off the circulating pump.
Optionally, the step of comparing the first difference with the preset threshold further includes:
determining that the first difference value is smaller than the preset threshold value, and improving the power of the heat exchange device;
acquiring a third flow after a second preset time, and calculating a second difference value between the third flow and the first flow;
comparing the second difference value with the preset threshold value;
and determining that the second difference is greater than or equal to the preset threshold value, and turning off the circulating pump.
Optionally, the preset threshold is 3 liters to 3.5 liters.
Optionally, the first flow rate is an average flow rate in a first period after the circulation pump is started; and/or the second flow is the real-time flow after the circulating pump is started for a third preset time.
Optionally, the duration corresponding to the first period is 5 seconds to 15 seconds; and/or the third preset time period is 15 seconds to 25 seconds.
The invention also proposes a water heater comprising a zero-cold water supply system as described above, a memory, a processor and a computer program stored on said memory and executable on said processor, said computer program, when executed by said processor, implementing the steps of the system method of a zero-cold water supply system as described above.
The zero-cold water supply system of the invention is characterized in that a temperature control valve and a flow monitor are arranged on a circulating water path, the temperature control valve is close to the water outlet end of a hot water pipe, the opening of a valve of the temperature control valve can be changed according to the change of water temperature, so that the water flow of the circulating water path can be changed according to the change of the water temperature, the flow detector is used for detecting the water flow of the circulating water path, so that the temperature change at the water outlet end of the hot water pipe can be reflected according to the change of the water flow of the circulating water path, a controller controls a circulating pump according to a detection signal of the flow detector, when the water flow change of the circulating water path reaches a preset condition, namely the water temperature at the water outlet end of the hot water pipe reaches the preset condition, namely the whole water temperature of the circulating pipe reaches the preset condition, user experience is improved, and therefore the practicability of the water heater is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of a unified embodiment of a zero-chilled-water supply system according to the present invention;
FIG. 2 is a graph showing a relationship between the opening degree of a thermostat valve and the temperature of water according to the present invention;
FIG. 3 is a schematic structural view of an H-valve and a thermo-valve according to the present invention;
FIG. 4 is a schematic flow chart illustrating a method for controlling a zero-chilled-water supply system according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating another embodiment of a method for controlling a zero chilled water supply according to the present invention;
fig. 6 is a flow chart illustrating a control method of a zero-cold water supply system according to another embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a zero-cold-water supply system.
In an embodiment of the present invention, as shown in fig. 1 to 3, the zero-cold-water supply system includes:
a circulation pump 10;
a water inlet end of the hot water pipe 20 is communicated with a water outlet of the circulating pump 10, and a water outlet end of the hot water pipe 20 is communicated with a water consumption device 30;
one end of the cold water pipe 40 is communicated with the water inlet of the circulating pump 10, and the other end of the cold water pipe 40 is communicated with the water outlet of the hot water pipe 20, so that the circulating pump 10, the hot water pipe 20 and the cold water pipe 40 form a circulating water path;
the temperature control valve 50 is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe 20;
a flow detector for detecting a flow of water in the circulating water path;
and a controller electrically connected to the flow rate detector to control the circulation pump 10 according to a detection signal of the flow rate detector.
In this embodiment, the zero-cold water supply system further includes a heat exchanging device 80, and the heat exchanging device 80 is used for heating the water in the circulating water path, specifically, the water in the hot water pipe 20. After the zero-cold-water supply system is used for the last time, cold water is reserved in the hot water pipe 20, and before the next time of use, a user starts a zero-cold-water preheating function, namely, the heat exchange device 80 and the circulating pump 10 are started to preheat water in the circulating water path. After the circulation pump 10 is turned on, the water in the hot water pipe 20 flows to the circulation pump 10 through the cold water pipe 40, and flows through the heat exchanging device 80 for heating, and then continues to flow to the water outlet end of the hot water pipe 20 after being heated, so as to perform circulation preheating on the water in the hot water pipe 20. The water outlet end of the hot water pipe 20 is communicated with both the water using equipment 30 and the cold water pipe 40, and the communication mode can be through a shunt pipe or a three-way valve structure, and the water outlet end of the hot water pipe 20 can be communicated with the water using equipment 30 and the cold water pipe 40. It should be noted that the connection point of the hot water pipe 20 and the water consuming device 30 should be adjacent to the connection point of the hot water pipe 20 and the cold water pipe 40, so that the water in the waterway between the hot water pipe 20 and the water consuming device 30 can fully enter the circulating waterway for circulating preheating.
In the circulation preheating process of the zero-cold-water supply system, the water using equipment 30 is closed, the heat exchange device 80 and the circulating pump 10 are opened, at the moment, water in the hot water pipe 20 enters the cold water pipe 40 under the action of the circulating pump 10, flows to the circulating pump 10 and then flows through the heat exchange device 80 for heat exchange, and flows to the cold water pipe 40 to start the next preheating circulation, so that the remained water in the hot water pipe 20 can be effectively preheated. After preheating is completed, the water temperature in the circulating water path is to meet the water demand of the customer, at this time, the circulating pump 10 is turned on and off, and the water using device 30 is turned on, so that the water in the hot water pipe 20 does not flow back any more, but can be directly taken by the user.
In the circulating preheating process of the circulating water path, after the water is subjected to heat exchange through the heat exchange device 80, the water temperature is reduced due to the fact that the water is transferred to cold water in the process of flowing to the water outlet end of the hot water pipe 20, namely the water temperature of each point of the circulating water path is different, the water temperature close to the water outlet end is lower than the water temperature close to the heat exchange device 80, and only when the water temperature close to the water outlet end of the hot water pipe 20, namely the water temperature close to the water using equipment 30 reaches the user requirement, the whole water temperature of the circulating water path can be considered to reach. The opening degree of the thermostat valve 50 can be changed along with the change of the water temperature, so that the circulating water flow rate of the circulating water path is also changed correspondingly, for example, the opening degree of the thermostat valve 50 is positively correlated with the water temperature, i.e., the larger the water temperature is, the larger the opening degree is, and the larger the water flow rate of the circulating water path is. Specifically, the temperature control valve 50 comprises a first valve body, a second valve body, a memory alloy spring arranged in the second valve body and a piston connected with the memory alloy spring, wherein the first valve body forms a water passing channel, the second valve body is communicated with the first valve body, the memory alloy and the piston jointly form a valve of the temperature control valve 50, the memory alloy spring can stretch or contract along with the change of water temperature so as to drive the piston to move to block the water passing channel or retract into the first valve body, and the larger the extending amount of the piston is, the smaller the opening degree of the valve is. The piston is provided with a water passing hole facing the water passing channel, and water in the water passing channel can flow to be in contact with the memory alloy spring through the water hole, so that the memory alloy spring can quickly and accurately sense the change of the water temperature and timely make deformation feedback, and the feedback result of the temperature control valve 50 on the change of the water temperature is more real and reliable.
The thermostatic valve 50 is adjacent to the water outlet end of the hot water pipe 20, i.e. adjacent to the water consumption device 30, so that the change of the opening degree of the thermostatic valve 50 reflects the temperature change at the water consumption end of the hot water pipe 20, so that the finally fed back water temperature information is more real and reliable and meets the requirements of users. The flow detector is disposed in the circulating water path, and is configured to detect a water flow rate of the circulating water path, so as to feed back a change in an opening degree of the temperature control valve 50 through a detected change in the water flow rate of the circulating water path, and further indirectly feed back a change in a water temperature at the water outlet end of the hot water pipe 20. The controller is connected with flow detector and circulating pump 10 electricity, and flow detector sends detected signal to the controller, when discharge changes to predetermineeing the condition, and the temperature changes when predetermineeing the condition promptly, and controller control circulating pump 10 closes to the rivers in termination circulation water route flow, make the user can take the hot water of preheating the completion in the hot-water line 20 through water equipment 30, improved user experience, thereby improve the practicality of water heater. In addition, the change of the water temperature is fed back through the temperature control valve 50, and the deformation amount of the memory deformation alloy is more real and effective in feeding back the change of the water temperature due to the fact that the water can be in direct contact with the memory deformation alloy, and the accuracy of the control of the circulation method is further improved.
The zero-cold water supply system of the invention arranges the temperature control valve 50 and the flow monitor on the circulating water path, the temperature control valve 50 is adjacent to the water outlet end of the hot water pipe 20, the valve opening of the temperature control valve 50 can be changed according to the change of the water temperature, thereby the water flow of the circulating water path can be changed according to the change of the water temperature, the flow detector is used for detecting the water flow of the circulating water path, thereby the temperature change at the water outlet end of the hot water pipe 20 can be reflected according to the change of the water flow of the circulating water path, the controller controls the circulating pump 10 according to the detection signal of the flow detector, when the water flow change of the circulating water path reaches the preset condition, namely the water temperature at the water outlet end of the hot water pipe 20 reaches the preset condition, namely the whole water temperature of the circulating pipe reaches the preset condition, thereby the controller can control the closing of the circulating pump 10, user experience is improved, and therefore the practicability of the water heater is improved.
Further, as shown in fig. 2, the valve opening of the temperature control valve 50 is inversely related to the water temperature. In this embodiment, the length of the memory alloy spring is in positive correlation with the water temperature, and may be in linear positive correlation, or in non-linear positive correlation, that is, the higher the water temperature is, the longer the memory alloy spring is, the more the piston enters the water passage, that is, the smaller the valve opening, so that the water flow of the circulating water passage is smaller. In practical applications, the thermostatic valve 50 is disposed on the flow path between the outlet end of the hot water pipe 20 and the cold water pipe 40, so that when the water temperature gradually rises to a preset condition, the thermostatic valve 50 does not obstruct the hot water from flowing to the water using equipment 30, and the amount of backflow of the hot water can be gradually reduced, thereby reducing heat loss. Specifically, the temperature control valve 50 may be set such that when the water temperature reaches the preset temperature condition, the valve is completely closed, i.e., the water passage is completely blocked by the piston, thereby preventing the water that has reached the preset water temperature in the hot water pipe 20 from continuously flowing back to cause heat loss, and improving the utilization rate of the hot water in the circulation water path, so as to further improve the practicability of the water heater.
Further, as shown in fig. 1, one end of the cold water pipe 40, which is communicated with the water pump, is also communicated with a water source, and one end of the cold water pipe 40, which is communicated with the hot water pipe 20, is also communicated with the water using equipment 30. In this embodiment, the end of the cold water pipe 40 connected to the water pump may be connected to the water source through a three-way valve, and the end of the cold water pipe 40 connected to the hot water pipe 20 may also be connected to the water using device 30 through a three-way valve. It is understood that the cold water pipe 40 and the hot water pipe 20 can be connected to the same water consuming device 30, and the user can adjust the water consuming device 30 to achieve the switching access of the hot water or the cold water, or the mixing access of the hot water and the cold water. In the process of preheating the circulating water path, water is not fed into the water source, and water is not fed into the water using equipment 30, so that water remained in the hot water pipe 20 can circularly flow in the circulating water path formed by the hot water pipe 20, the cold water pipe 40 and the circulating pump 10 and can carry out pre-heat exchange; when the water temperature at the water outlet end of the hot water pipe 20 reaches a preset condition, the circulating pump 10 is turned off, and the water in the hot water pipe 20 does not flow back to the cold water pipe 40 any more; if the user begins to use water, the water source begins to feed water, a part of the water source directly flows through the cold water pipe 40 and flows to the water using equipment 30 for the user to use, the other part of the water flows through the circulating pump 10 and then flows to the hot water pipe 20, the water after heat exchange of the heat exchange device 80 flows to the water using equipment 30 to supplement the original preheated hot water, and therefore the user can continuously take the hot water. One end of the cold water pipe 40 is connected with the water outlet end of the water using equipment 30 and the hot water pipe 20, and the other end is communicated with the water source and the circulating pump 10, so that the cold water pipe 40 can form a circulating water path and can be used as a water using pipeline, the utilization rate of the cold water pipe 40 is improved, the whole water path structure of a zero-cold water supply system is simplified, and the practicability of the water heater is further improved.
Further, as shown in fig. 1 and 3, the zero-cold water supply system further includes a check valve 60 disposed in the circulating water path, and the check valve 60 is communicated from the water outlet end of the hot water pipe 20 toward the cold water pipe 40. In this embodiment, the check valve 60 is used to prevent the water flow in the cold water pipe 40 from flowing into the outlet end of the hot water pipe 20 to cause the water flow disorder in the circulating water path, and also reduces the influence on the water temperature at the outlet end of the hot water pipe 20, so that the whole flow path and the preheating process of the zero-cold water supply process are more stable. In combination with the above embodiment in which the valve opening of the temperature control valve 50 is inversely related to the water temperature, the temperature control valve 50 is also disposed on the flow path between the water outlet end of the hot water pipe 20 and the cold water pipe 40, and the temperature control valve 50 is disposed at the upstream of the check valve 60, that is, the water outlet end of the hot water pipe 20, the temperature control valve 50, the check valve 60 and the cold water pipe 40 are sequentially communicated, so that after the preheating is completed, that is, when the valve opening of the temperature control valve 50 tends to be completely closed, part of the water is blocked between the check valve 60 and the temperature control valve 50, thereby improving the effective flow rate of the water in the circulating water path, and further improving the practicability of the zero-cold-water supply system.
Further, as shown in fig. 1 and 3, the zero-cold-water supply system further includes an H-valve 70 disposed in the circulating water path, where the H-valve 70 includes a first straight pipe 71, a second straight pipe 72, and a horizontal pipe 73 communicating the first straight pipe 71 with the second straight pipe 72, the hot water pipe 20 communicates with the water using equipment 30 through the first straight pipe 71, the hot water pipe 20 communicates with the cold water pipe 40 through the horizontal pipe 73, and the cold water pipe 40 communicates with the water using equipment 30 through the second straight pipe 72; the thermo valve 50 is provided in the cross pipe 73. In this embodiment, the H-valve 70 may realize the communication between the hot water pipe 20 and the water using equipment 30 and the cold water pipe 40, and may also realize the communication between the cold water pipe 40 and the water using equipment 30, so that the overall communication structure of the hot water pipe 20, the cold water pipe 40 and the water using equipment 30 is simpler and more stable. The thermostat valve 50 is integrated in the transverse tube 73 of the H-valve 70, i.e. the first valve body of the thermostat valve 50 is integrated with the transverse tube 73 of the H-valve 70, so that the piston can directly block or withdraw from the tube cavity of the transverse tube 73, thereby realizing the control of the water flow passing through the transverse tube 73. In combination with the above-mentioned embodiment of the check valve 60, the check valve 60 may also be integrated with the transverse pipe 73 of the H-valve 70, that is, the valve body of the check valve 60 is integrally disposed with the transverse pipe 73, and the valve core of the check valve 60 is disposed in the transverse pipe 73, so that the overall structure of the H-valve 70, the temperature control valve 50 and the check valve 60 is simpler, more compact and more stable; in addition, multiple functions are realized through an integrated valve structure, so that the assembly of the circulating water path of the zero-cold-water supply system is simpler and more convenient, and the assembly efficiency is improved.
As shown in fig. 3, the present invention also proposes a combination valve comprising: an H-valve 70 including a first straight pipe 71, a second straight pipe 72, and a cross pipe 73 communicating the first straight pipe 71 and the second straight pipe 72; and the temperature control valve 50 is arranged on the transverse pipe 73, and is used for controlling the water flux of the transverse pipe 73 along with the change of the water temperature.
Specifically, the thermostat valve 50 includes a valve body 51 connected to the cross pipe 73, the valve body 51 has a valve cavity 511 communicating with the cross pipe 73, the thermostat valve 50 further includes a memory material spring 52 disposed in the valve cavity 511, and a piston 53 connected to the end of the memory material spring 52, the memory material spring 52 can expand and contract with the change of the water temperature, so that the piston 53 enters the cross pipe 73 or retracts into the valve cavity 511. In practical application, a water through hole 531 communicated with the valve cavity 511 is formed in one end, away from the memory material spring 52, of the piston 53, and water flowing through the transverse pipe 73 can enter the valve cavity 511 from the water through hole 531 to contact the memory material spring 52, so that the memory material spring 52 can deform in time along with the change of water temperature, and the reaction speed of the temperature control valve 50 on the water temperature is improved.
In an embodiment, the combination valve further includes a check valve 60 disposed on the transverse pipe 73, the check valve 60 is conducted from the first straight pipe 71 to the second straight pipe 72, and the temperature control valve 50 is disposed on the water inlet side of the check valve 60, so that water flowing through the temperature control valve 50 flows to the second straight pipe 72 through the check valve 60, thereby preventing the water from flowing back to the temperature control valve 50 to affect the opening change of the temperature control valve 50, and improving the working stability of the combination valve.
As shown in fig. 4 to 6, the present invention further provides a method for controlling a zero-cold water supply system, the method for controlling the zero-cold water supply system includes:
starting the circulating pump 10 and the heat exchange device 80;
acquiring a first flow rate;
acquiring a second flow after a first preset time;
the opening degree of the temperature control valve 50 is positively correlated with the water temperature, the second flow is determined to be greater than the first flow, and the circulating pump 10 is closed;
or, the opening degree of the temperature control valve 50 is inversely related to the water temperature, the second flow rate is determined to be smaller than the first flow rate, and the circulating pump 10 is closed.
In this embodiment, taking the opening degree of the thermostat valve 50 and the water temperature as an example of inverse correlation, the first flow rate is obtained after the circulation pump 10 and the heat exchanger 80 are started, that is, the first flow rate is obtained after the circulation water path is preheated, and the first flow rate may be a real-time flow rate or an average flow rate over a period of time; after the first preset time, obtaining a second flow, if the circulation water path is effectively preheated, the second flow may be smaller than the first flow, it needs to be described that the second flow may only need to be smaller than the first flow, and may also need to be different from the first flow by a preset value, which is not limited herein. After determining that the second flow is smaller than the first flow, that is, the circulation water path is completely preheated, the controller controls the circulation pump 10 to be turned off to end the preheating process of the circulation water path. If the second flow is not less than the first flow, the circulation pump 10 is kept on, and the circulation water path is continuously preheated. From this, can make zero cold water supply system according to the automatic preheating process that finishes the circulation water route of temperature, need not user operation, and the control process is more accurate timing, has improved convenience and practicality.
Further, as shown in fig. 5, the step of determining that the second flow rate is greater than or less than the first flow rate includes:
calculating a first difference between the first flow rate and the second flow rate;
comparing the first difference value with a preset threshold value;
and determining that the first difference is greater than or equal to the preset threshold value, and turning off the circulating pump 10.
In this embodiment, the valve opening of the temperature control valve 50 is inversely related to the water temperature, the first flow corresponds to the first water temperature, the second flow corresponds to the second water temperature, the first difference corresponds to the front-rear temperature difference, if the first difference is greater than or equal to the preset threshold, the front-rear temperature difference is large enough, that is, the second water temperature can satisfy the preset temperature condition, so that the controller can control the circulation pump 10 to be turned off. The circulating pump 10 is closed after the first difference value between the first flow and the second flow reaches the preset threshold value, so that the second water temperature after temperature rise can meet the actual requirement of a user, and the practicability of the control method of the zero-cold-water supply system is improved.
Further, as shown in fig. 6, the step of comparing the first difference with the preset threshold further includes:
determining that the first difference value is smaller than the preset threshold value, and increasing the power of the heat exchange device 80;
acquiring a third flow after a second preset time, and calculating a second difference value between the third flow and the first flow;
comparing the second difference value with the preset threshold value;
and determining that the second difference is greater than or equal to the preset threshold value, and turning off the circulating pump 10.
In this embodiment, if the second water temperature still cannot reach the preset temperature after the circulation pump 10 is turned on for the first preset time, the controller will increase the power of the heat exchange device 80 to increase the heat exchange rate of the circulation water path, so that the water in the circulation water path is heated up more quickly. If the water heater is an electric water heater, the heat exchange device 80 is a water storage liner and an electric heating rod arranged in the water storage liner; if the water heater is a gas water heater, the heat exchange device 80 is a heat exchanger and a burner providing a heat source for the heat exchanger. After the controller controls the heat exchange device 80 to increase the power, the third flow corresponding to the third water temperature is obtained again after a preset time, and if a second difference value between the third flow and the first flow is greater than or equal to a preset threshold value, the third water temperature meets the water temperature requirement, and at this time, the controller can control the circulating pump 10 to be closed; if the second difference between the third flow rate and the first flow rate is still smaller than the preset threshold, the circulation pump 10 will continue to operate, and obtain the flow rate again after the second preset duration for comparison. It can be understood that the power value that heat transfer device 80 improves can correspond with the temperature that the user required to make the temperature in circulation water route preheated to satisfy the user's demand can, with the realization to the constant temperature heating in circulation water route, avoid preheating the temperature too high. In practical application, the preset threshold value can be 3 liters to 3.5 liters, and can be 3.3 liters, if the preset threshold value is less than 3 liters, the temperature rise degree of the water temperature cannot meet the water demand of a user; if the preset threshold value is larger than 3.5 liters, the water flow after temperature rise is too small, so that the water heater cannot work normally, therefore, the preset threshold value is set to be 3 liters to 3.5 liters, the normal operation of the water heater can be ensured, and the preheating temperature can be ensured to meet the requirements of users.
Further, the first flow rate is an average flow rate in a first time period after the circulation pump 10 is started; and/or the second flow rate is a real-time flow rate after the circulation pump 10 is started for a third preset time period. In this embodiment, after the circulation pump 10 is just started, the water flow in the circulation water path is unstable and changes significantly, which results in that the detection data of the real-time water flow is not true enough, and the first flow is set as the average flow in the first time period after the circulation pump 10 is started, so that the initial water flow in the circulation water path fed back by the flow detector is more true and reliable. In practical application, the time duration corresponding to the first time period is 5 seconds to 15 seconds, optionally 10 seconds, and after the circulating pump 10 is started, the time duration required for stabilizing the water flow of the circulating water path is 5 seconds to 15 seconds, so that the first flow is set as the average flow within 5 seconds to 15 seconds after the circulating pump 10 is started, the time for waiting for the water flow to be stable can be reduced, the more real initial water flow can be detected, and the practicability of the control method of the zero-cold-water supply system is improved. The third preset time period should be longer than the time period corresponding to the first time period, that is, the third preset time period is the time period corresponding to the first time period plus the time period from the acquisition of the first flow to the acquisition of the second flow, and since the water flow of the circulating water path is already stable at this time, only the real-time water flow can be detected. In practical application, the third preset time period may be 15 seconds to 25 seconds, optionally 20 seconds, and the time period corresponding to the first time period is 10 seconds after the first flow rate is obtained, so that the flow rate can be prevented from being obtained and compared for multiple times due to too short interval time, an invalid control process can be reduced, and the preheating temperature exceeding the required temperature due to too long interval time can be prevented, thereby further improving the stability and the practicability of the control method of the zero-cold-water supply system.
The invention also provides a water heater, which comprises a zero-cold-water supply system, a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the computer program realizes the step of the control method of the zero-cold-water supply system when being executed by the processor; the zero-cold-water supply system and the control method thereof refer to the above embodiments, and the water heater adopts all technical solutions of all the above embodiments, so that the water heater at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (16)
1. A zero cold water supply system, comprising:
a circulation pump;
the water inlet end of the hot water pipe is communicated with the water outlet of the circulating pump, and the water outlet end of the hot water pipe is communicated with water using equipment;
one end of the cold water pipe is communicated with a water inlet of the circulating pump, and the other end of the cold water pipe is communicated with a water outlet end of the hot water pipe, so that the circulating pump, the hot water pipe and the cold water pipe form a circulating water path;
the temperature control valve is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe;
a flow detector for detecting a flow of water in the circulating water path;
and the controller is electrically connected with the flow detector and used for controlling the circulating pump according to a detection signal of the flow detector.
2. A zero cold water supply system according to claim 1, wherein the opening of said thermostatic valve is inversely related to the temperature of the water.
3. The zero-cold water supply system of claim 1, wherein the cold water pipe is further communicated with a water source at one end communicated with the water pump, and is further communicated with a water using device at one end communicated with the hot water pipe.
4. The zero-cold water supply system according to claim 3, further comprising a check valve disposed in the circulation water path, wherein the check valve is communicated from the water outlet end of the hot water pipe to the cold water pipe.
5. The zero-cold water supply system according to claim 3, further comprising an H valve disposed in the circulating water path, wherein the H valve comprises a first straight pipe, a second straight pipe and a horizontal pipe communicating the first straight pipe with the second straight pipe, the hot water pipe communicates with the water using equipment through the first straight pipe, the hot water pipe communicates with the cold water pipe through the horizontal pipe, and the cold water pipe communicates with the water using equipment through the second straight pipe; the temperature control valve is arranged on the transverse pipe.
6. A combination valve, comprising:
the H valve comprises a first straight pipe, a second straight pipe and a transverse pipe for communicating the first straight pipe with the second straight pipe;
and the temperature control valve is arranged on the transverse pipe so as to control the water flux of the transverse pipe along with the change of the water temperature.
7. The combination valve of claim 6, wherein the thermostatic valve comprises a valve body connected to the cross tube, the valve body having a valve cavity communicating with the cross tube, the thermostatic valve further comprising a memory material spring disposed in the valve cavity, and a piston connected to an end of the memory material spring, the memory material spring being retractable with a change in water temperature to allow the piston to enter or retract into the valve cavity.
8. The combination valve of claim 7, wherein the end of the piston remote from the memory material spring is provided with a water through hole communicated with the valve cavity.
9. The combination valve of claim 6 further comprising a one-way valve disposed on said cross tube.
10. A control method of a zero-cold water supply system, characterized in that the zero-cold water supply system comprises:
a circulation pump;
the water inlet end of the hot water pipe is communicated with the water outlet of the circulating pump, and the water outlet end of the hot water pipe is communicated with water using equipment;
one end of the cold water pipe is communicated with a water inlet of the circulating pump, and the other end of the cold water pipe is communicated with a water outlet end of the hot water pipe, so that the circulating pump, the hot water pipe and the cold water pipe form a circulating water path;
the temperature control valve is arranged on the circulating water path and is adjacent to the water outlet end of the hot water pipe;
a flow detector for detecting a flow of water in the circulating water path; and
the heat exchange device is used for exchanging heat with the water in the circulating water channel;
the control method of the zero-cold water supply system comprises the following steps:
starting the circulating pump and the heat exchange device;
acquiring a first flow rate;
acquiring a second flow after a first preset time;
the opening degree of the temperature control valve is positively correlated with the water temperature, the second flow is determined to be larger than the first flow, and the circulating pump is closed;
or the opening degree of the temperature control valve is inversely related to the water temperature, the second flow is determined to be smaller than the first flow, and the circulating pump is closed.
11. The method of controlling a zero chilled water supply of claim 10, wherein the step of determining whether the second flow rate is greater than or less than the first flow rate comprises:
calculating a first difference between the first flow rate and the second flow rate;
comparing the first difference value with a preset threshold value;
and determining that the first difference is greater than or equal to the preset threshold value, and turning off the circulating pump.
12. The method of controlling a zero chilled water supply of claim 11, wherein the step of comparing the first difference to the preset threshold further comprises:
determining that the first difference value is smaller than the preset threshold value, and improving the power of the heat exchange device;
acquiring a third flow after a second preset time, and calculating a second difference value between the third flow and the first flow;
comparing the second difference value with the preset threshold value;
and determining that the second difference is greater than or equal to the preset threshold value, and turning off the circulating pump.
13. The method of controlling a zero cold water supply system of claim 11, wherein said preset threshold is 3 liters to 3.5 liters.
14. The method of claim 10, wherein the first flow rate is an average flow rate in a first period after the circulation pump is turned on; and/or the second flow is the real-time flow after the circulating pump is started for a third preset time.
15. The method of claim 14, wherein the first period corresponds to a time period of 5 to 15 seconds; and/or the third preset time period is 15 seconds to 25 seconds.
16. A water heater, comprising:
the zero chilled water supply of any one of claims 1 to 5;
memory, processor and computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the control method of a zero cold water supply system as claimed in any one of claims 10 to 15.
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| CN201910669287.XA CN112254348A (en) | 2019-07-22 | 2019-07-22 | Zero-cold-water supply system, combination valve, control method of water supply system and water heater |
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| CN201910669287.XA CN112254348A (en) | 2019-07-22 | 2019-07-22 | Zero-cold-water supply system, combination valve, control method of water supply system and water heater |
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| CN113701361A (en) * | 2021-09-06 | 2021-11-26 | 珠海格力电器股份有限公司 | Starting method and device of water heater and water heater |
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