CN116255475A

CN116255475A - Bypass valve and water heater comprising same

Info

Publication number: CN116255475A
Application number: CN202310313378.6A
Authority: CN
Inventors: 原世超; 夏瑞丽
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-13

Abstract

The invention discloses a bypass valve and a water heater comprising the same, wherein the bypass valve comprises a valve body, a valve core, a fixed seat, an overflow hole, a transmission rod, a rotor and a reset piece; the valve core can slide relative to the fixed seat to adjust the opening of the overflow hole; the rotor is rotationally connected with the transmission rod and can reciprocate along the axial direction of the transmission rod; the rotor can rotate under the impact of water flow, and one end face of the rotor, facing the fixed seat in the axial direction of the transmission rod, is abutted against the valve core so that the valve core can slide relative to the fixed seat along the axial direction of the transmission rod; the reset piece is used for resetting the valve core. When water is reused after water is stopped and the temperature is raised, more cold water needs to be added into the water outlet channel because the initial water temperature in the water outlet channel is higher, and the opening of the overflow hole is the largest. When normal water use is restored, the water temperature is stable, so that excessive cold water does not need to be added into the water outlet channel, and the valve core slides relative to the fixed seat to reduce the opening of the overflow hole.

Description

Bypass valve and water heater comprising same

Technical Field

The invention relates to the field of water heaters, in particular to a bypass valve and a water heater comprising the bypass valve.

Background

Water heaters are common stoves for heating water. Cold water flows into the heat exchanger of the water heater from the water inlet pipe, and flows out through the water outlet pipe for users after heat exchange and temperature rise of the water and the heat exchanger.

When the user closes the valve to stop water use during the process of using the hot water, the water in the heat exchanger stops flowing. Because the heat exchanger has certain thermal inertia, heat stored on the heat exchanger after fire is closed is continuously conducted to the water in the heat exchanger, so that the water temperature of the part is overhigh, and water cut-off and temperature rise are caused. After the valve is opened again, the user may feel discomfort caused by a section of high temperature water.

A section of bypass pipe is connected between water inlet and outlet pipes in the existing water heater, so that part of cold water does not flow through the heat exchanger, directly flows to a water outlet pipe of the water heater through the bypass pipe, and the part of cold water is used for neutralizing a hot water section caused by water cut-off and temperature rise. The conventional bypass pipe is a flow passage with a fixed flow cross section, and cannot adjust the bypass flow, so that the water temperature of the outlet water is uncontrollable.

Disclosure of Invention

The invention aims to overcome the defect that the flow of a bypass pipe of a water heater is difficult to adjust in the prior art, and provides a bypass valve and the water heater comprising the bypass valve.

The invention solves the technical problems by the following technical scheme:

the bypass valve comprises a valve body and a valve core, wherein a water inlet channel, a water outlet channel and a bypass channel are arranged in the valve body, two ends of the bypass channel are respectively communicated with the water inlet channel and the water outlet channel, the valve core is arranged in the bypass channel, and the valve core can move relative to the valve body to adjust the opening of the bypass channel; the bypass valve further comprises a fixed seat, an overflow hole, a transmission rod, a rotor and a reset piece;

the fixed seat is fixed on the valve body, the peripheral side wall of the valve core is in butt joint with the peripheral side wall of the fixed seat, the overflow hole is arranged on the peripheral side wall of the valve core and/or the peripheral side wall of the fixed seat, the water inlet channel and the water outlet channel are communicated through the overflow hole, and the valve core can slide relative to the fixed seat to adjust the opening of the overflow hole;

the transmission rod is connected with the valve body and keeps static relative to the valve body, the rotor is sleeved on the transmission rod and is rotationally connected with the transmission rod, and the rotor can reciprocate along the axial direction of the transmission rod;

the rotor can rotate under the impact of water flow, the rotor is arranged at one end of the valve core, which is far away from the fixed seat, and is rotationally connected with the valve core, and the rotor is abutted against the valve core towards one end surface of the fixed seat in the axial direction of the transmission rod so that the valve core can slide relative to the fixed seat along the axial direction of the transmission rod;

the reset piece is connected with the valve core, and the reset piece is used for applying acting force to the valve core in the direction away from the fixing seat.

In this scheme, cold water flows in from the inlet channel, and hot water flows out from the outlet channel, and bypass channel communicates between inlet channel and outlet channel to cold water can flow in to the outlet channel in order to neutralize the temperature in the outlet channel from bypass channel after the case adjusts the aperture. The rotor rotates under the action of water flow and moves along the axial direction of the transmission rod, and because the rotor is abutted with the valve core, the rotor can drive the valve core to synchronously move along the axial line of the transmission rod, so that the sliding relative to the fixed seat is realized, the opening of the overflow hole is changed, the opening adjustment of the bypass channel is realized, and the flow of cold water entering the water outlet channel from the water inlet channel is adjusted. When water is reused after water is stopped and the temperature is raised, more cold water needs to be added into the water outlet channel because the initial water temperature in the water outlet channel is higher, and the opening of the overflow hole is the largest. When normal water use is resumed, the water temperature is stable, so that excessive cold water does not need to be added into the water outlet channel, and the valve core slides relative to the fixed seat to reduce the opening of the overflow hole.

Preferably, the transmission rod is a threaded rod, the rotor is provided with a threaded hole, and the threaded rod is in threaded fit with the threaded hole of the rotor.

In this scheme, realize through threaded rod and screw thread cooperation that the rotor moves along the axis direction of transfer line, screw thread cooperation also can restrict the rotor and reverse the removal easily, guarantees the stability of overflow aperture.

Preferably, the fixing seat is arranged at one end of the bypass channel, which is close to the water outlet channel, the valve core is arranged at one end of the fixing seat, which faces the water inlet channel, and the rotor is arranged at one end of the valve core, which faces the water inlet channel.

In this aspect, the above arrangement makes it possible for the rotor and the valve spool to be also subjected to the driving force of the water flow toward the water outlet passage side.

Preferably, the valve core comprises a valve core body and a protruding part, and the protruding part is connected to one end of the valve core body, which is far away from the fixed seat;

the rotor comprises a connecting seat, the connecting seat is sleeved on the protruding portion, and the connecting seat is rotationally connected with the protruding portion.

In this scheme, above-mentioned setting simple structure, and can avoid rotor and case body to interfere, guarantee the stable rotation of rotor for the case.

Preferably, the protruding part is provided with a first limit groove and a first limit protrusion, the first limit groove is positioned at one side of the first limit protrusion facing the valve core body, and the outer peripheral wall of the protruding part is inwards recessed to form the first limit groove and the first limit protrusion;

the connecting seat comprises a second limit groove and a second limit protrusion, the second limit protrusion is positioned on one side of the second limit groove facing the valve core body, and the inner peripheral wall of the connecting seat is inwards recessed to form the second limit groove and the second limit protrusion;

the first limiting protrusion is accommodated in the second limiting groove, and the second limiting protrusion is accommodated in the first limiting groove.

In this scheme, through the cooperation of first spacing protruding and second spacing groove and the cooperation of the spacing protruding of second and first spacing groove, can enough realize the block between bulge and the connecting seat and be connected, also can realize the rotation of rotor for the case, avoid the case to follow the synchronous rotation of rotor.

Preferably, the minimum flow area of the bypass passage is less than 1/3 times the total maximum flow area of the flow holes.

In the scheme, the minimum overflow area of the bypass channel is smaller than 1/3 times of the total maximum overflow area of the overflow holes, so that when the hot water outlet channel just begins to outlet, the bypass channel keeps the maximum overflow to provide enough cold water for neutralizing the hot water; as the water outlet channel continuously discharges water, the opening of the overflow hole is gradually reduced, and when the opening of the overflow hole is smaller than 1/3 of the total maximum overflow area of the overflow hole, the water flow of the bypass channel starts to be reduced so as to adapt to the water temperature requirement of the water outlet channel after a period of water discharge.

Preferably, one of the valve core and the fixing seat is provided with a guide groove, the other one is provided with a guide block, the guide groove extends along the axial direction of the bypass channel, and the guide block is matched with the guide groove and can slide along the extending direction of the guide groove.

In this scheme, above-mentioned setting is used for guiding the direction of movement of case, avoids producing the interference between case and the fixing base, improves the reliability in the bypass valve use.

Preferably, the reset piece is a spring, and two ends of the spring are respectively abutted with the valve core and the fixing seat.

In this scheme, above-mentioned setting relies on the elasticity of spring to realize the relative slip between case and the fixing base to realize the reset of case.

Preferably, the rotor is an impeller, and an axial direction of the impeller is parallel to an axial direction of the bypass passage.

In this scheme, the blade of impeller rotates under the rivers impact to realize the holistic rotation of impeller.

A water heater comprising a bypass valve as described above.

In this scheme, when the water heater is stopped briefly, the water in the water heater appears stopping water temperature rise under the thermal inertia heating of water heater, if the user opens and uses hot water, cold water can get into the play water channel from bypass channel to neutralize the hot water in the water channel, simultaneously along with the continuous use of hot water, the rotor rotates under the rivers effect and drives the case and slide in order to reduce the aperture that overflows the hole, thereby after the one section hot water that temperature is too high discharges because of stopping water temperature rise, the cold water that gets into the water channel from bypass channel reduces, thereby avoid cold water too much to lead to water temperature to not reach user demand this moment.

The invention has the positive progress effects that: cold water flows in from the water inlet channel, hot water flows out from the water outlet channel, and the bypass channel is communicated between the water inlet channel and the water outlet channel, so that the cold water can flow into the water outlet channel from the bypass channel after the opening degree of the cold water is adjusted by the valve core so as to neutralize the water temperature in the water outlet channel. The rotor rotates under the action of water flow and moves along the axial direction of the transmission rod, and because the rotor is abutted with the valve core, the rotor can drive the valve core to synchronously move along the axial line of the transmission rod, so that the sliding relative to the fixed seat is realized, the opening of the overflow hole is changed, the opening adjustment of the bypass channel is realized, and the flow of cold water entering the water outlet channel from the water inlet channel is adjusted. When water is reused after water is stopped and the temperature is raised, more cold water needs to be added into the water outlet channel because the initial water temperature in the water outlet channel is higher, and the opening of the overflow hole is the largest. When normal water use is resumed, the water temperature is stable, so that excessive cold water does not need to be added into the water outlet channel, and the valve core slides relative to the fixed seat to reduce the opening of the overflow hole.

Drawings

Fig. 1 is a schematic view illustrating an internal structure of a water heater according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a bypass valve according to an embodiment of the invention.

Fig. 3 is a schematic diagram of an internal structure of a bypass valve when an opening of an overflow hole is maximum according to an embodiment of the invention.

Fig. 4 is a schematic perspective view illustrating an internal structure of a bypass valve according to an embodiment of the present invention.

FIG. 5 is a schematic view showing the internal structure of a bypass valve according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of another internal structure of a bypass valve according to an embodiment of the present invention.

Fig. 7 is a schematic view showing an internal structure of a bypass valve when the opening of an overflow hole is at a minimum in an embodiment of the invention.

Reference numerals illustrate:

water heater body 11

Combustion chamber 12

Heat exchanger 13

Inlet pipe 14

Outlet pipe 15

Bypass valve 16

Valve body 2

Water inlet channel 21

The water outlet passage 22

Bypass passage 23

Valve core 3

Valve core body 31

Projection 32

First limiting groove 321

First limit projection 322

Fixing base 4

Through hole 41

Flow-through holes 5

Transmission rod 6

Rotor 7

Blade 71

Connecting seat 72

Second limit groove 721

Second limit protrusion 722

Reset piece 8

Water flow space 9

Guide block 101

Guide groove 102

Detailed Description

The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.

As shown in fig. 1, the present embodiment discloses a water heater including a water heater body 11, a water inlet pipe 14, a water outlet pipe 15, and a bypass valve 16. The water heater body 11 comprises a combustion chamber 12 and a heat exchanger 13, and fuel gas is introduced into the burner for combustion. The water inlet pipe 14 and the water outlet pipe 15 are connected to the heat exchanger 13, cold water flows into the heat exchanger 13 from the water inlet pipe 14, the heat exchanger 13 is arranged in the combustion chamber 12 to exchange heat with water under the heating of the combustion chamber 12, and heated hot water flows out from the water outlet pipe 15. A bypass valve 16 is connected between the inlet pipe 14 and the outlet pipe 15, and cold water in the inlet pipe 14 can flow into the outlet pipe 15 through the bypass valve 16 to neutralize hot water in the outlet pipe 15.

When the user stops using water, the combustion chamber 12 stops heating. However, the temperature of the heat exchanger 13 is still higher at this time, and the heat exchanger 13 can continuously exchange heat with the water inside the heat exchanger 13 for a period of time due to the thermal inertia of the heat exchanger 13, so that the temperature of the water in the period of time is too high, and the water cut-off temperature rise is caused. When the user directly uses hot water at this time, discomfort and even scalding are easily caused. In this embodiment, cold water in the water inlet pipe 14 flows into the water outlet pipe 15 through the bypass valve 16 to neutralize hot water in the water outlet pipe 15, so that the water temperature of water with excessive temperature due to water cut-off and temperature rise in the section is reduced, and user experience is improved.

It should be noted that the water heater is not limited to the gas water heater that is heated by the gas combustion in this embodiment, and in other embodiments, the water heater may be an electric water heater or other suitable water heater.

As shown in fig. 2 to 6, the bypass valve 16 includes a valve body 2, a valve spool 3, a fixed seat 4, an overflow hole 5, a transmission rod 6, a rotor 7, and a reset member 8.

As shown in fig. 3, the valve body 2 has a water inlet passage 21, a water outlet passage 22, and a bypass passage 23. The water inlet channel 21 communicates with the water inlet pipe 14 of the water heater for circulating cold water. The water outlet channel 22 is communicated with the water outlet pipe 15 of the water heater and is used for circulating hot water. The bypass passage 23 is provided between the water inlet passage 21 and the water outlet passage 22, and both ends of the bypass passage 23 are respectively connected to the water inlet passage 21 and the water outlet passage 22, so that cold water in the water inlet passage 21 can flow into the water outlet passage 22 through the bypass passage 23 to be neutralized with hot water in the water outlet passage 22.

As shown in fig. 3, the valve element 3 is provided in the bypass passage 23, and the valve element 3 is provided so as to be movable relative to the valve body 2 to adjust the opening degree of the bypass passage 23, thereby controlling the flow rate of the cold water flowing into the water outlet passage 22, and adjusting the water temperature in the water outlet passage 22. The fixing seat 4 is arranged in the bypass channel 23 and is fixedly connected with the valve body 2, namely, the fixing seat 4 is static compared with the valve body 2, the overflow hole 5 is arranged on the peripheral side wall of the fixing seat 4, and the water inlet channel 21 and the water outlet channel 22 are communicated through the overflow hole 5. The valve core 3 and the fixed seat 4 are respectively arranged at two ends of the bypass channel 23, and the valve core 3 can slide relative to the fixed seat 4 so as to adjust the opening of the overflow hole 5, thereby realizing the adjustment of the opening of the bypass channel 23.

Specifically, as shown in fig. 3, 4 and 7, the fixing seat 4 is disposed at one end of the bypass channel 23 near the water outlet channel 22, the valve core 3 is disposed at one end of the fixing seat 4 facing the water inlet channel 21, the valve core 3 and the fixing seat 4 are both in a cylindrical structure, the valve core 3 is sleeved on the outer peripheral side of the fixing seat 4, the inner surface of the peripheral side wall of the valve core 3 is abutted with the outer surface of the peripheral side wall of the fixing seat 4, the abutment is only that the gap between the inner surface of the peripheral side wall of the valve core 3 and the outer surface of the peripheral side wall of the fixing seat 4 is small, so as to reduce the gap flow of water flow between the inner surface of the peripheral side wall of the valve core 3 and the outer surface of the peripheral side wall of the fixing seat 4, but the inner surface of the peripheral side wall of the valve core 3 and the outer surface of the peripheral side wall of the fixing seat 4 cannot be completely free, otherwise the smoothness of sliding of the valve core 3 relative to the fixing seat 4 is affected. The valve core 3 and the fixed seat 4 form a hollow water flow space 9, the fixed seat 4 is also provided with a plurality of through holes 41, the water flow space 9 is communicated with the water outlet channel 22 through the through holes 41, cold water flowing in from the water inlet channel 21 can only flow into the water flow space 9 through the overflow holes 5, and can only flow into the water outlet channel 22 through the through holes 41, so that the cold water flow flowing into the water outlet channel 22 is regulated by regulating the opening of the overflow holes 5.

In other alternative embodiments, the flow-through holes 5 may be provided on the peripheral side wall of the spool 3, and the flow-through holes 5 penetrate the peripheral side wall of the spool 3 at both ends in the radial direction of the spool 3. Alternatively, the diameter of the fixing seat 4 may be larger than the diameter of the valve core 3, and the fixing seat 4 may be sleeved on the outer peripheral surface of the valve core 3.

In other alternative embodiments, the fixing seat 4 may be disposed at one end of the bypass channel 23 near the water inlet channel 21, and the valve core 3 may be disposed at one end of the fixing seat 4 facing the water outlet channel 22.

As shown in fig. 3, the transmission rod 6 is connected to the valve body 2 and is stationary relative to the valve body 2, and the rotor 7 is sleeved on the transmission rod 6 and is rotatably connected to the transmission rod 6, and the rotor 7 can reciprocate along the axial direction of the transmission rod 6. Specifically, the transmission rod 6 in the present embodiment is fixed on the fixed seat 4, and the axial direction of the transmission rod 6 is parallel to the axial direction of the bypass channel 23, and compared with the transmission rod 6 directly fixed on the valve body 2, the transmission rod 6 fixed on the fixed seat 4 can reduce the length of the transmission rod 6 and reduce the cost. The transmission rod 6 in this embodiment is a threaded rod, an external thread is provided on the outer circumferential surface of the transmission rod 6, the rotor 7 has a threaded hole, and the threaded hole of the rotor 7 is matched with the threaded rod to convert the rotation of the rotor 7 into the movement of the rotor 7 in the axial direction of the transmission rod 6. Moreover, when the rotor 7 rotates in the same direction, the screw-fit can also ensure that the rotor 7 can only move toward one side along the axial direction of the transmission rod 6, limit the rotor 7 to easily move reversely (i.e., move toward the other side along the axial direction of the transmission rod 6), and ensure the stability of the opening degree of the overflow hole 5.

The rotor 7 can rotate under the impact of water flow, the rotor 7 is arranged at one end of the valve core 3 far away from the fixed seat 4 and is rotationally connected with the valve core 3, and the rotor 7 is abutted against the valve core 3 towards one end face of the fixed seat 4 in the axial direction of the transmission rod 6, so that the valve core 3 can slide along the axial direction of the transmission rod 6 relative to the fixed seat 4. Specifically, the rotor 7 in the present embodiment is an impeller whose axial direction is parallel to the axial direction of the bypass passage 23. The impeller comprises a plurality of blades 71 and a connecting seat 72, the plurality of blades 71 are fixed on the connecting seat 72, a threaded hole is formed in the connecting seat 72, and the whole impeller is rotationally connected with the valve core 3 through the connecting seat 72. The blades 71 of the impeller are rotated by the impact of the water flow, thereby achieving the rotation of the impeller as a whole. The rotor 7 is provided at an end of the valve body 3 toward the water inlet passage 21, so that the rotor 7 and the valve body 3 can also receive a driving force of the water flow toward the water outlet passage 22 side. Because the rotor 7 is abutted with the valve core 3, when the rotor 7 moves towards the fixed seat 4 along the axial direction of the transmission rod 6, the rotor 7 can abut against the valve core 3 and drive the valve core 3 to synchronously move towards the fixed seat 4, so that the sliding of the valve core 3 relative to the fixed seat 4 is realized, the opening of the overflow hole 5 is changed, the opening adjustment of the bypass channel 23 is realized, and the flow of cold water entering the water outlet channel 22 from the water inlet channel 21 is adjusted.

In other alternative embodiments, when the valve core 3 is disposed at an end of the fixing base 4 facing the water outlet passage 22, the rotor 7 is disposed at an end of the valve core 3 facing the water outlet passage 22.

As shown in fig. 3, the restoring member 8 is connected to the valve core 3, and the restoring member 8 is configured to apply a force to the valve core 3 in a direction away from the fixing seat 4. Specifically, the reset member 8 in this embodiment is a spring, the spring is disposed in the water flow space 9, two ends of the spring are respectively abutted to the valve core 3 and the fixed seat 4, when the valve core 3 moves towards the fixed seat 4, the spring is stressed to compress, when water stops, the rotor 7 stops rotating, the elastic force of the spring is released, and the valve core 3 is driven to move towards a direction away from the fixed seat 4, so that reset of the valve core 3 is realized. How to realize the reverse movement of the rotor 7 on the threaded rod by the spring to realize the resetting of the valve core 3 belongs to the prior art in the field, and is not described herein.

In other alternative embodiments, the return 8 may also be another elastic member capable of performing the above-described functions.

When water is reused after water is stopped and the temperature is raised, more cold water needs to be added into the water outlet channel 22 because the initial water temperature in the water outlet channel 22 is higher, and the opening of the overflow hole 5 is the largest. When normal water use is resumed, since the water temperature is stable, it is not necessary to add excessive cold water to the water outlet passage 22, so the valve core 3 slides relative to the fixed seat 4 to reduce the opening of the overflow hole 5.

As shown in fig. 5, the valve core 3 includes a valve core body 31 and a protruding portion 32, and the protruding portion 32 is connected to an end of the valve core body 31 remote from the fixing seat 4. The connecting seat 72 is sleeved on the protruding portion 32, and the connecting seat 72 is rotatably connected with the protruding portion 32. Specifically, the protruding portion 32 has a first limiting groove 321 and a first limiting protrusion 322, the first limiting groove 321 is located at a side of the first limiting protrusion 322 facing the valve core body 31, and the outer peripheral wall of the protruding portion 32 is recessed inwards to form the first limiting groove 321 and the first limiting protrusion 322. The connecting seat 72 includes a second limiting groove 721 and a second limiting protrusion 722, and the second limiting protrusion 722 is located on one side of the second limiting groove 721 facing the valve element body 31, and the inner peripheral wall of the connecting seat 72 is recessed inwards to form the second limiting groove 721 and the second limiting protrusion 722. The first limiting protrusion 322 is accommodated in the second limiting groove 721, and the second limiting protrusion 722 is accommodated in the first limiting groove 321.

In this embodiment, through the cooperation of the first limiting protrusion 322 and the second limiting groove 721 and the cooperation of the second limiting protrusion 722 and the first limiting groove 321, not only can the engagement connection between the protruding portion 32 and the connection seat 72 be realized, but also the rotation of the rotor 7 relative to the valve core 3 can be realized, and the valve core 3 is prevented from following the synchronous rotation of the rotor 7. The protruding part 32 and the connecting seat 72 with the above structures are simple in structure, can avoid interference between the rotor 7 and the valve core body 31, and ensure stable rotation of the rotor 7 relative to the valve core 3.

As shown in fig. 6, the fixed seat 4 is provided with a guide groove 102, the valve core 3 is provided with a guide block 101, the guide groove 102 extends along the axial direction of the bypass channel 23, and the guide block 101 is matched with the guide groove 102 and can slide along the extending direction of the guide groove 102 so as to guide the moving direction of the valve core 3, avoid interference between the valve core 3 and the fixed seat 4, and improve the reliability of the bypass valve 16 in the use process.

In other alternative embodiments, the guide groove 102 may be provided on the valve element 3, and the guide block 101 may be provided on the fixing base 4.

In the present embodiment, the minimum flow area of the bypass passage 23 is smaller than 1/3 times the total maximum flow area of the flow holes 5, so that the bypass passage 23 maintains the maximum flow amount to provide sufficient cold water to neutralize hot water when the hot water is just started to be discharged from the water outlet passage 22; as the water outlet channel 22 continues to discharge water, the opening of the overflow hole 5 gradually decreases, and when the opening of the overflow hole 5 is smaller than 1/3 of the total maximum overflow area of the overflow hole 5, the water flow rate of the bypass channel 23 starts to decrease so as to adapt to the water temperature requirement of the water outlet channel 22 after a period of water discharge. The minimum flow area of the bypass channel 23 is the area of the smallest section of the bypass channel 23, i.e. the sum of the cross-sectional areas of all through holes 41 in the holder 4, in the embodiment, and the total maximum flow area of the flow holes 5 is the sum of the areas of all flow holes 5 when the flow holes 5 are not blocked.

The principle of the opening degree adjustment of the bypass valve 16 will be described below in accordance with the specific structure of the above-described middle bypass valve 16.

When the water is stopped, as shown in fig. 3, the opening of the overflow hole 5 is at a maximum at this time, and the amount of cold water which can flow from the water inlet passage 21 into the water outlet passage 22 is at a maximum. Therefore, when water is reused after water is stopped and the temperature is raised, more cold water initially enters the water outlet channel 22, and the higher water temperature can be neutralized.

When the water is recovered gradually to normal water use, more cold water does not need to be poured into the water outlet channel 22, so as shown in fig. 7, the impeller rotates under the action of water flow, the screwing position of the impeller and the threaded rod is adjusted, the impeller drives the valve core 3 to move towards the direction of the fixed seat 4, the opening of the overflow hole 5 is gradually reduced until the elasticity of the spring and the acting force of the water flow to the rotor 7 are balanced, at the moment, the opening of the overflow hole 5 is minimum, the inflow amount of cold water is minimum, and other problems caused by large bypass flow are avoided, such as direct outflow of cold water without heating, water boiling caused by small flow through the heat exchanger 13, and the like. When the water is turned off again, the spring drives the rotor 7 to rotate reversely, thereby increasing the opening degree of the overflow hole 5 to the maximum.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims

1. The bypass valve comprises a valve body and a valve core, wherein a water inlet channel, a water outlet channel and a bypass channel are arranged in the valve body, two ends of the bypass channel are respectively communicated with the water inlet channel and the water outlet channel, the valve core is arranged in the bypass channel, and the valve core can move relative to the valve body to adjust the opening of the bypass channel; the bypass valve is characterized by further comprising a fixed seat, an overflow hole, a transmission rod, a rotor and a reset piece;

2. The bypass valve of claim 1, wherein the drive rod is a threaded rod and the rotor has a threaded bore, the threaded rod being threadedly engaged with the threaded bore of the rotor.

3. The bypass valve of claim 1, wherein the mounting seat is disposed at an end of the bypass passage adjacent to the water outlet passage, the valve core is disposed at an end of the mounting seat facing the water inlet passage, and the rotor is disposed at an end of the valve core facing the water inlet passage.

4. The bypass valve of claim 1, wherein the spool includes a spool body and a tab connected to an end of the spool body remote from the seat;

5. The bypass valve as recited in claim 4, wherein the protruding portion has a first limit groove and a first limit projection, the first limit groove being located on a side of the first limit projection toward the spool body, an outer peripheral wall of the protruding portion being recessed inward to form the first limit groove and the first limit projection;

6. The bypass valve of claim 1, wherein the minimum flow area of the bypass passage is less than 1/3 times the total maximum flow area of the flow-through holes.

7. The bypass valve as claimed in claim 1, wherein one of the spool and the fixed seat is provided with a guide groove, and the other is provided with a guide block, the guide groove extending in an axial direction of the bypass passage, the guide block being engaged with the guide groove and being slidable in an extending direction of the guide groove.

8. The bypass valve of claim 1, wherein the return member is a spring, and two ends of the spring are respectively abutted against the valve core and the fixed seat.

9. A bypass valve as recited in any one of claims 1 to 8, wherein the rotor is an impeller, and an axial direction of the impeller is parallel to an axial direction of the bypass passage.

10. A water heater comprising a bypass valve as claimed in any one of claims 1 to 9.