Water circuit assembly, water heater and water heater constant temperature water outlet control method

Abstract

The present invention discloses a water circuit assembly of a water heater, a water heater and a method for controlling constant temperature water outlet of a water heater, wherein the water circuit assembly comprises a water inlet pipe, a water outlet pipe and a bypass pipe connected between the water inlet pipe and the water outlet pipe, wherein the water inlet pipe is detachably connected to the cold water interface of the heat exchanger via a retaining spring, and / or the water outlet pipe is detachably connected to the hot water interface of the heat exchanger via a retaining spring. According to the water circuit assembly of the water heater of an embodiment of the present invention, the water inlet pipe and the water outlet pipe of the water circuit assembly are detachably connected to the cold water interface and the hot water interface of the heat exchanger respectively via retaining springs, thereby improving the disassembly and assembly efficiency of the water circuit assembly and the heat exchanger, improving production efficiency, facilitating replacement, and facilitating after-sales maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a water circuit component, a water heater and a method for controlling constant-temperature water outlet of the water heater. Background Art

[0002] In the related art, there are many pipe structures in the water channel assembly, and the pipe bodies are often locked together by screws or latches. The assembly structure is complex and the process is cumbersome, which is prone to water seepage problems. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a water circuit assembly for a water heater, which has high disassembly and assembly efficiency between parts of the water circuit assembly and between the water circuit assembly and the heat exchanger, improves production efficiency, is convenient for replacement, and is convenient for after-sales maintenance.

[0004] The present invention also provides a water heater having the water channel assembly, which has high assembly efficiency and high production cost.

[0005] The present invention also proposes a constant temperature water outlet control method for a water heater, which can ensure that the actual water outlet temperature of the water heater approaches the set water outlet temperature, thereby meeting the demand for constant temperature water outlet.

[0006] According to the water circuit assembly of the water heater of an embodiment of the present invention, the water heater has a cold water interface and a hot water interface, the water circuit assembly includes a water inlet pipe, a water outlet pipe and a bypass pipe connected between the water inlet pipe and the water outlet pipe, the water inlet pipe and the cold water interface are detachably connected via a retaining spring, and / or the water outlet pipe and the hot water interface are detachably connected via a retaining spring.

[0007] According to the water circuit assembly of the water heater of the embodiment of the present invention, the water inlet pipe and the water outlet pipe of the water circuit assembly are detachably connected to the cold water interface and the hot water interface of the heat exchanger respectively by means of a retaining spring, thereby improving the disassembly and assembly efficiency of the water circuit assembly and the heat exchanger.

[0008] In addition, the water circuit assembly of the water heater according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to some embodiments of the present invention, the water inlet pipe is connected to the bypass pipe via a retaining spring, and / or the water outlet pipe is connected to the bypass pipe via a retaining spring.

[0010] In an optional embodiment, the retaining spring includes: a first retaining portion, a second retaining portion and a connecting portion for connecting to the first retaining portion and the second retaining portion, the first retaining portion, the second retaining portion and the connecting portion jointly constitute a retaining groove open to one end, and the retaining groove is respectively engaged with the connection between the cold water interface and the water inlet pipe, and / or the connection between the hot water interface and the water outlet pipe, and / or the connection between the water inlet pipe and the bypass pipe, and / or the connection between the water outlet pipe and the bypass pipe.

[0011] In a further optional embodiment, the first clamping portion and the second clamping portion are symmetrically arranged relative to a center line of the clamping spring.

[0012] In an optional example, the first clamping portion and / or the second clamping portion are respectively provided with a clamping ring, and correspondingly, the cold water interface, the water inlet pipe, the hot water interface, the water outlet pipe and the bypass pipe are each provided with at least two clamping protrusions, and every two relatively arranged clamping protrusions are confined within the clamping ring.

[0013] In an optional example, the two oppositely disposed latching protrusions are arranged to fit together, and the width of the snap ring is less than or equal to the sum of the thicknesses of the two latching protrusions.

[0014] In an optional example, the clamping protrusion is in a circular ring shape, and correspondingly, the clamping ring has an arc surface.

[0015] In an optional example, the retaining ring includes a first arc segment and a second arc segment that are relatively arranged, and the first arc segment and the second arc segment respectively surround the cold water interface and the water inlet pipe, and / or the water outlet pipe and the hot water interface, and / or the water inlet pipe and the bypass pipe, and / or the water outlet pipe and the bypass pipe.

[0016] According to some embodiments of the present invention, the opening of the connecting end of the card slot is smaller than the opening of the opening end.

[0017] In an optional embodiment, the opening end gradually decreases from the outer end to the inner end.

[0018] According to some embodiments of the present invention, the water inlet pipe or the cold water pipe is respectively provided with a plug-in section, the plug-in section is inserted into the cold water interface or the hot water interface, the plug-in section is provided with a sealing groove, a sealing ring is provided in the sealing groove, and the thickness of the sealing ring is higher than the pipe surface of the plug-in section.

[0019] The water heater according to the second aspect of the present invention comprises the water circuit assembly of the above-mentioned embodiment. Since the disassembly and assembly efficiency between the various components of the water circuit assembly according to the embodiment of the present invention and between the water circuit assembly and the heat exchanger are high, the water heater according to the embodiment of the present invention has high assembly efficiency and low production cost.

[0020] According to a method for controlling water outlet of a water heater at a constant temperature in an embodiment of the third aspect of the present invention, the water heater comprises: a heat exchanger having a cold water interface and a hot water interface; a water circuit assembly having an inlet pipe, an outlet pipe and a bypass pipe connected between the inlet pipe and the outlet pipe, the inlet pipe being connected to the cold water interface, and the outlet pipe being connected to the hot water interface; the method for controlling water outlet of a water heater at a constant temperature comprises the following steps: detecting a total water inlet flow rate Q of the heat exchanger by a first flow sensor; 总 The first temperature sensor detects the water inlet temperature T0 of the heat exchanger, and the second temperature sensor detects the water outlet temperature T 热 , wherein the set water outlet temperature of the water heater is T s The water heater controller is based on the total water flow Q 总 , water inlet temperature T0, water outlet temperature T 热 And set the outlet water temperature to T s Calculate the theoretical water flow rate Q of the bypass pipe 理论 Detect the actual water flow rate Q of the bypass pipe through the second flow sensor 实际 , thereby obtaining the water outlet flow difference Q of the bypass pipe 差值 The controller adjusts the actual water flow rate Q of the bypass pipe through the water proportional valve. 实际 , so that the actual water flow rate Q 实际 Approaching the theoretical water flow rate Q 理论 , so that the actual outlet water temperature T of the water heater s' Adjust to near T s .

[0021] The constant temperature water outlet control method of the water heater in the embodiment of the present invention collects the total water inlet flow, water inlet temperature and water outlet temperature in real time through the controller of the water heater and calculates the theoretical water outlet flow that matches the bypass pipe in combination with the set water outlet temperature of the water heater, and adjusts the actual water outlet flow of the bypass pipe according to the theoretical water outlet flow, thereby accurately adjusting the actual water outlet temperature to be close to the set water outlet temperature, thereby achieving the purpose of extreme constant temperature.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded view of a waterway assembly according to some embodiments of the present invention at one angle;

[0024] Figure 2 is an exploded view of a waterway assembly according to some embodiments of the present invention from another angle;

[0025] Figure 3 is a top view of a water heater according to some embodiments of the present invention;

[0026] Figure 4 is a side view of a water heater according to some embodiments of the present invention;

[0027] Figure 5 is a stereoscopic diagram of a circlip according to some embodiments of the present invention;

[0028] Figure 6 yes Figure 5 The main view of

[0029] Figure 7 yes Figure 5 Top view of the .

[0030] Reference numerals:

[0031] Water heater 100;

[0032] Heat exchanger 10; cold water interface 11; hot water interface 12;

[0033] Water channel assembly 20; water inlet pipe 21; water outlet pipe 22; bypass pipe 23; clamping protrusion 241; plug section 251; sealing groove 2511;

[0034] The clamping spring 30; the first clamping portion 31; the second clamping portion 32; the connecting portion 33; the clamping ring 341; the first arc segment 3411; the second arc segment 3412; the clamping groove 35;

[0035] Water proportional valve 41; water flow sensor 42. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The following is combined with Figure 1-Figure 6 The water circuit assembly 20 of the water heater 100 according to the embodiment of the present invention is described in detail. The water heater 100 may be an electric water heater 100, a gas water heater 100 or a phase change thermal storage water heater 100.

[0038] like Figure 1 and Figure 2 As shown, the water heater 100 includes: a heat exchanger 10 and a water circuit assembly 20. The heat exchanger 10 has a cold water interface 11 and a hot water interface 12. That is, cold water enters the heat exchanger 10 through the cold water interface 11, and flows out from the hot water interface 12 after being heated by the heat exchanger 10.

[0039] like Figure 3 and Figure 4 As shown, the water circuit assembly 20 has a water inlet pipe 21, a water outlet pipe 22 and a bypass pipe 23 connected between the water inlet pipe 21 and the water outlet pipe 22. The water inlet pipe 21 is connected to the cold water interface 11, and the water outlet pipe 22 is connected to the hot water interface 12. That is, the water inlet pipe 21 and the water outlet pipe 22 are connected through the bypass pipe 23, and the cold water of the water inlet pipe 21 can enter the bypass pipe 23 and the heat exchanger 10 respectively, and the hot water of the heat exchanger 10 can flow out through the water outlet pipe 22 and mix with the cold water in the bypass pipe 23, so as to obtain water with suitable water temperature.

[0040] In order to ensure that the water inlet pipe 21 and the water outlet pipe 22 are connected to the bypass pipe 23 and the heat exchanger 10 at the same time, the water inlet pipe 21 and the water outlet pipe 22 are both three-way pipes. In other words, the water inlet pipe 21 and the water outlet pipe 22 each include at least three interfaces, one of which is connected to the municipal natural water pipe, another of which is connected to the cold water interface 11, and another of which is connected to the bypass pipe 23; one of which is connected to the hot water interface 12, another of which is connected to the bypass pipe 23, and another of which directly outputs mixed water to the outside. In addition, in order to facilitate the connection of the water inlet pipe 21 and the water outlet pipe 22 to the heat exchanger 10 and the bypass pipe 23 respectively, the water inlet pipe 21 and the water outlet pipe 22 have at least two interfaces extending in the same direction.

[0041] In order to prevent the water in the bypass pipe 23 from flowing back, the bypass pipe 23 is provided with a one-way valve, which only allows water to flow from the water inlet pipe 21 to the bypass pipe 23 to prevent the water in the bypass pipe 23 from flowing back.

[0042] The water inlet pipe 21 and the cold water interface 11, and / or the water outlet pipe 22 and the hot water interface 12 are detachably connected through the retaining spring 30, thereby improving the disassembly and assembly efficiency of the water inlet pipe 21 and the cold water interface 11, and the water outlet pipe 22 and the hot water interface 12. That is, after the water inlet pipe 21 and the water outlet pipe 22 of the water circuit assembly 20 are pre-installed in place with the cold water interface 11 and the hot water interface 12, respectively, the retaining spring 30 is used to clamp the cold water interface 11 and the water inlet pipe 21, and the hot water interface 12 and the water outlet pipe 22, respectively, to prevent the water inlet pipe 21 from being separated from the cold water interface 11, and the water outlet pipe 22 from being separated from the hot water interface 12. When it is necessary to separate the water inlet pipe 21 from the cold water interface 11, and the water outlet pipe 22 from the hot water interface 12, just loosen the retaining spring 30, which is convenient for disassembly and assembly and replacement compared with screw connection or welding.

[0043] In short, according to the water circuit assembly of the water heater 100 according to the embodiment of the present invention, the water inlet pipe 21 and the water outlet pipe 22 of the water circuit assembly 20 are respectively detachably connected to the cold water interface 11 and the hot water interface 12 of the heat exchanger 10 using a retaining spring 30, thereby improving the disassembly and assembly efficiency of the water circuit assembly 20 and the heat exchanger 10, improving production efficiency, facilitating replacement, and facilitating after-sales maintenance.

[0044] In some embodiments of the present invention, the water inlet pipe 21 is connected to the bypass pipe 23 by a circlip 30, and / or the water outlet pipe 22 is connected to the bypass pipe 23 by a circlip 30. That is, the water inlet pipe 21 and the bypass pipe 23 and the water outlet pipe 22 and the bypass pipe 23 are two relatively independent parts, and the water inlet pipe 21 and the bypass pipe 23 and the water outlet pipe 22 and the bypass pipe 23 are connected and locked together by a circlip 30 clamp to form a whole, thereby improving the assembly and disassembly efficiency between the water inlet pipe 21 and the bypass pipe 23, and the water outlet pipe 22 and the bypass pipe 23. Since the water inlet pipe 21 and the bypass pipe 23, and the water outlet pipe 22 and the bypass pipe 23 are formed separately, it is convenient to set other components on the water inlet pipe 21, the water outlet pipe 22 and the bypass pipe 23, for example, a water proportional valve 41 or a flow sensor 42.

[0045] In some optional embodiments of the present invention, Figure 5 and Figure 6 Combination Figure 3 and Figure 4 As shown, the clamping spring 30 includes: a first clamping portion 31, a second clamping portion 32, and a connecting portion 33 for connecting to the first clamping portion 31 and the second clamping portion 32. The first clamping portion 31, the second clamping portion 32, and the connecting portion 33 jointly form a clamping slot 35 open to one end, and the clamping slot 35 is respectively engaged with the connection between the cold water interface 11 and the water inlet pipe 21, and / or the connection between the hot water interface 12 and the water outlet pipe 22, and / or the connection between the water inlet pipe 21 and the bypass pipe 23, and / or the connection between the water outlet pipe 22 and the bypass pipe 23. That is, the first clamping portion 31 and the second clamping portion 32 simultaneously clamp two mutually connected pipe bodies (for example, the water inlet pipe 21 and the cold water interface 11, the water outlet pipe 22 and the hot water interface 12, the water inlet pipe 21 and the bypass pipe 23, and the water outlet pipe 22 and the bypass pipe 23), thereby preventing the connection position of the two pipe bodies from being displaced.

[0046] In a further optional embodiment, Figure 5 and Figure 6 The first clamping portion 31 and the second clamping portion 32 are symmetrically arranged relative to the center line of the clamping spring 30. In other words, the first clamping portion 31 and the second clamping portion 32 have the same shape and structure, which is beneficial to the processing and production of the clamping spring 30 on the one hand, and the first clamping portion 31 and the second clamping portion 32 have the same force on the two tubes on the other hand, making the connection structure of the two tubes more stable.

[0047] In further optional examples, such as Figure 5 and Figure 6 Combination Figure 3 and Figure 4 As shown, the first clamping portion 31 and / or the second clamping portion 32 are respectively provided with a clamping ring 341, and correspondingly, the cold water interface 11, the water inlet pipe 21, the hot water interface 12, the water outlet pipe 22 and the bypass pipe 23 are each provided with at least two clamping protrusions 241, and each two clamping protrusions 241 arranged opposite to each other are confined in the clamping ring 341. For example, in the case where the cold water interface 11 and the water inlet pipe 21 are connected to each other, the cold water interface 11 is provided with a clamping protrusion 241, and the water inlet pipe 21 is provided with another clamping protrusion 241, and the clamping protrusion 241 of the cold water interface 11 and the clamping protrusion 241 of the water inlet pipe 21 are arranged opposite to each other and are simultaneously confined in the clamping ring 341, thereby limiting the water inlet pipe 21 from moving toward one side away from the cold water interface 11 and limiting the cold water interface 11 from moving toward the other side away from the water inlet pipe 21. For another example, in the case where the hot water interface 12 and the water outlet pipe 22 are connected to each other, the hot water interface 12 is provided with a clamping protrusion 241, and the water outlet pipe 22 is provided with another clamping protrusion 241. The clamping protrusion 241 of the hot water interface 12 and the clamping protrusion 241 of the water outlet pipe 22 are arranged opposite to each other and are simultaneously confined in the clamping ring 341, thereby restricting the water outlet pipe 22 from moving toward one side away from the hot water interface 12 and restricting the hot water interface 12 from moving toward the other side away from the water outlet pipe 22. That is, the clamping ring 341 makes the two interconnected pipe bodies more tightly combined and less likely to separate.

[0048] In a further optional example, two oppositely disposed clamping protrusions 241 are arranged in close contact, and the width of the clamping ring 341 is less than or equal to the sum of the thicknesses of the two clamping protrusions 241. In this way, the clamping protrusions 241 can be tightly fastened together by the clamping ring 341 to prevent the two interconnected tubes from separating.

[0049] In a specific embodiment of the present invention, the locking protrusion 241 is annular, and correspondingly, the snap ring 341 has an arc surface. The annular locking protrusion 241 cooperates with the snap ring 341 with an arc surface, so that the locking protrusion 241 is more convenient to be locked in the snap ring 341.

[0050] In a specific embodiment of the present invention, Figure 5-Figure 7As shown, the clamping ring 341 includes a first arc segment 3411 and a second arc segment 3412 which are arranged relatively to each other, and the first arc segment 3411 and the second arc segment 3412 respectively surround the cold water interface 11 and the water inlet pipe 21, and / or the water outlet pipe 22 and the hot water interface 12, and / or the water inlet pipe 21 and the bypass pipe 23, and / or the water outlet pipe 22 and the bypass pipe 23. For example, the first arc segment 3411 surrounds the cold water interface 11, and the second arc segment 3412 surrounds the water inlet pipe 21; for another example, the first arc segment 3411 surrounds the hot water interface 12, and the second arc segment 3412 surrounds the water outlet pipe 22; for another example, the first arc segment 3411 surrounds the bypass pipe 23, and the second arc segment 3412 surrounds the water outlet pipe 22; for another example, the first arc segment 3411 surrounds the bypass pipe 23, and the second arc segment 3412 surrounds the water inlet pipe 21. It can be understood that when the sizes of the two interconnected pipes are different, the extension lengths of the first arc segment 3411 and the second arc segment 3412 are different, such as Figure 6 and Figure 7 shown.

[0051] In a specific embodiment of the present invention, Figure 5-Figure 7 As shown, the opening of the connecting end of the clamping groove is smaller than that of the opening end. In this way, the structural strength of the clamping spring 30 is stable and not easy to deform. In addition, the opening end gradually narrows from the outer end to the inner end. In this way, it is more conducive to the clamping spring 30 to be clamped into the two interconnected tubes, thereby improving the assembly efficiency.

[0052] In some optional embodiments of the present invention, the water inlet pipe 21 or the cold water pipe is respectively provided with a plug-in section 251, the plug-in section 251 is inserted into the cold water interface 11 or the hot water interface 12, the plug-in section 251 is provided with a sealing groove 2511, and a sealing ring is provided in the sealing groove 2511, and the thickness of the sealing ring is higher than the pipe surface of the plug-in section 251. In this way, when the water circuit assembly 20 is connected to the cold water interface 11 or the hot water interface 12 of the heat exchanger 10 or the bypass pipe 23, the plug-in section 251 can be inserted into the hot water interface 12, the cold water interface 11 or the bypass pipe 23, and sealed by the sealing ring, thereby improving the sealing between the two interconnected pipe bodies to prevent water seepage.

[0053] The water heater 100 according to the embodiment of the present invention includes the water circuit assembly 20 of the above-mentioned embodiment. Since the disassembly and assembly efficiency between the various components of the water circuit assembly 20 according to the embodiment of the present invention and between the water circuit assembly 20 and the heat exchanger 10 is high, the water heater 100 according to the embodiment of the present invention has high assembly efficiency and low production cost.

[0054] According to the constant temperature water outlet control method of a water heater according to an embodiment of the present invention, the water heater comprises a heat exchanger and a water circuit assembly of the above embodiment, wherein the heat exchanger has a cold water interface and a hot water interface. The water circuit assembly comprises an inlet pipe, an outlet pipe and a bypass pipe connected between the inlet pipe and the outlet pipe, the inlet pipe is connected to the cold water interface, and the outlet pipe is connected to the hot water interface.

[0055] The method for controlling the constant temperature water outlet of a water heater comprises the following steps: detecting the total water inlet flow rate Q of the heat exchanger by a first flow sensor; 总 The first temperature sensor detects the water inlet temperature T0 of the heat exchanger, and the second temperature sensor detects the water outlet temperature T 热 , wherein the set water outlet temperature of the water heater is T s The water heater controller is based on the total water flow Q 总 , water inlet temperature T0, water outlet temperature T 热 And set the outlet water temperature to T s Calculate the theoretical water flow rate Q of the bypass pipe 理论 , can satisfy the following formula: Q 理论 =Q 总 *(T 热 -T s ) / (T 热 -T0).

[0056] The actual water outflow Q of the bypass pipe is detected by the second flow sensor 实际 , thereby obtaining the water outlet flow difference Q of the bypass pipe 差值 The controller adjusts the actual water flow rate Q of the bypass pipe through the water proportional valve. 实际 , so that the actual water flow rate Q 实际 Approaching the theoretical water flow rate Q 理论 , so that the actual outlet water temperature T of the water heater s' Adjust to near T s .

[0057] The constant temperature water outlet control method of the water heater in the embodiment of the present invention collects the total water inlet flow, water inlet temperature and water outlet temperature in real time through the controller of the water heater and calculates the theoretical water outlet flow that matches the bypass pipe in combination with the set water outlet temperature of the water heater, and adjusts the actual water outlet flow of the bypass pipe according to the theoretical water outlet flow, thereby accurately adjusting the actual water outlet temperature to be close to the set water outlet temperature, thereby achieving the purpose of extreme constant temperature.

[0058] In some embodiments of the present invention, the total water inlet flow rate Q 总When the flow rate is greater than zero and less than the set value, the controller cuts off the bypass pipe through the water proportional valve, so that all the water in the water inlet pipe flows into the heat exchanger, thereby avoiding thermal damage to the heat exchanger due to insufficient water. Insufficient water will cause partial water vapor to form in the heat exchanger, resulting in a drop in the outlet water temperature. At this time, the total water outlet flow rate can be adjusted through the total water outlet proportional valve of the water heater to make the outlet water temperature reach the set outlet water temperature, thereby realizing the constant temperature water outlet function.

[0059] Optionally, when the water heater is a gas water heater, the gas proportional valve of the gas heat exchanger adjusts the firepower, thereby adjusting the actual water outlet temperature T s' Adjust to near T s For example, when the outlet water temperature is low, the firepower can be increased; when the outlet water temperature is high, the firepower can be reduced so that the actual outlet water temperature approaches the set temperature.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water circuit assembly of a water heater, wherein the heat exchanger of the water heater has a cold water interface and a hot water interface, characterized in that: The water circuit assembly comprises: a water inlet pipe, a water outlet pipe and a bypass pipe connected between the water inlet pipe and the water outlet pipe, the water inlet pipe is detachably connected to the cold water interface via a retaining spring, and / or the water outlet pipe is detachably connected to the hot water interface via a retaining spring; The water inlet pipe is connected to the bypass pipe by a retaining spring, and the water outlet pipe is connected to the bypass pipe by a retaining spring; the retaining spring includes: a first retaining portion, a second retaining portion and a connecting portion for connecting to the first retaining portion and the second retaining portion, the first retaining portion, the second retaining portion and the connecting portion jointly constitute a retaining groove open to one end; the opening of the retaining groove connecting end is smaller than the opening of the opening end, and the opening end gradually narrows from the outer end to the inner end; the retaining spring is provided with a retaining ring, and the retaining ring includes a first arc segment and a second arc segment arranged relatively to each other, the first arc segment and the second arc segment respectively surround the cold water interface and the water inlet pipe, the water outlet pipe and the hot water interface, the water inlet pipe and the bypass pipe, and the water outlet pipe and the bypass pipe.

2. The water circuit assembly of the water heater according to claim 1, characterized in that: The card slots are respectively engaged with the connection between the cold water interface and the water inlet pipe, and / or the connection between the hot water interface and the water outlet pipe, and / or the connection between the water inlet pipe and the bypass pipe, and / or the connection between the water outlet pipe and the bypass pipe.

3. The water circuit assembly of the water heater according to claim 2, characterized in that: The first clamping portion and the second clamping portion are symmetrically arranged relative to a center line of the clamping spring.

4. The water circuit assembly of the water heater according to claim 3, characterized in that: The first clamping portion and / or the second clamping portion are respectively provided with a clamping ring, and correspondingly, the cold water interface, the water inlet pipe, the hot water interface, the water outlet pipe and the bypass pipe are each provided with at least two clamping protrusions, and every two relatively arranged clamping protrusions are confined within the clamping ring.

5. The water circuit assembly of the water heater according to claim 4, characterized in that: The two oppositely arranged clamping protrusions are arranged in a close fit, and the width of the clamping ring is less than or equal to the sum of the thicknesses of the two clamping protrusions.

6. The water circuit assembly of the water heater according to claim 4, characterized in that: The clamping protrusion is in the shape of a circular ring, and correspondingly, the clamping ring has an arc surface.

7. The water circuit assembly of the water heater according to claim 2, characterized in that: The water inlet pipe or the water outlet pipe is respectively provided with a plug-in section, the plug-in section is inserted into the cold water interface or the hot water interface, the plug-in section is provided with a sealing groove, a sealing ring is provided in the sealing groove, and the thickness of the sealing ring is higher than the pipe surface of the plug-in section.

8. A water heater, characterized in that: A water circuit assembly comprising the water heater according to any one of claims 1-7.

9. A method for controlling constant temperature water output of a water heater, characterized in that: The water heater comprises: A heat exchanger, wherein the heat exchanger has a cold water interface and a hot water interface; The water circuit assembly according to any one of claims 1 to 7, wherein the water circuit assembly comprises a water inlet pipe, a water outlet pipe and a bypass pipe connected between the water inlet pipe and the water outlet pipe, the water inlet pipe is connected to the cold water interface, and the water outlet pipe is connected to the hot water interface; the water heater constant temperature water outlet control method comprises the following steps: The total water inlet flow Q of the heat exchanger is detected by the first flow sensor 总 The first temperature sensor detects the water inlet temperature T0 of the heat exchanger, and the second temperature sensor detects the water outlet temperature T 热 , wherein the set water outlet temperature of the water heater is T s The water heater controller is based on the total water flow Q 总 , water inlet temperature T0, water outlet temperature T 热 And set the outlet water temperature to T s Calculate the theoretical water flow rate Q of the bypass pipe 理论 ; The actual water outflow Q of the bypass pipe is detected by the second flow sensor 实际 , thereby obtaining the water outlet flow difference Q of the bypass pipe 差值 The controller adjusts the actual water flow rate Q of the bypass pipe through the water proportional valve. 实际 , so that the actual water flow rate Q 实际 Approaching the theoretical water flow rate Q 理论 , so that the actual outlet water temperature T of the water heater s' Adjust to near T s .

10. The method for controlling constant temperature water outlet of a water heater according to claim 9, characterized in that: The total water flow rate Q 总 When the water pressure is greater than zero and less than a set value, the controller cuts off the bypass pipe through a water proportional valve, so that all the water in the water inlet pipe flows into the heat exchanger.

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