CN219263262U

CN219263262U - Bypass valve and water heater comprising same

Info

Publication number: CN219263262U
Application number: CN202320837714.2U
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: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-06-27
Anticipated expiration: 2033-04-06

Abstract

The utility model 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, a first driving piece and a second driving piece; the first driving piece is arranged to be capable of adjusting the magnitude of the driving force applied to the valve core according to the water temperature in the water outlet channel; when the driving force of the first driving piece is larger than that of the second driving piece, the first driving piece drives the valve core to move towards the first position, and the opening of the overflow hole is reduced; when the driving force of the first driving member is smaller than that of the second driving member, the second driving member drives the valve core to move towards the second position, and the opening of the overflow hole is increased. When water is reused after water is stopped and the temperature is raised, the initial water temperature in the water outlet channel is higher, and the driving force applied to the valve core by the first driving part is minimum and smaller than the driving force applied to the valve core by the second driving part. When normal water use is resumed, the driving force applied by the first driving member to the valve core is maximum and greater than the driving force applied by the second driving member to the valve core because the water temperature is stable and lower than the initial temperature.

Description

Bypass valve and water heater comprising same

Technical Field

The utility model 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 utility model 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 utility model 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 first driving piece and a second driving piece;

the fixed seat is fixed on the valve body, the peripheral side wall of the valve core is abutted with the peripheral side wall of the fixed seat, the overflow hole is arranged on 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 between a first position and a second position relative to the fixed seat;

the first driving piece and the second driving piece are both connected with the valve core, the first driving piece is used for applying a force towards the first position direction to the valve core, and the second driving piece is used for applying a force towards the second position direction to the valve core;

the first driving piece is arranged to be capable of adjusting the driving force applied to the valve core according to the water temperature in the water outlet channel; the higher the water temperature in the water outlet channel is, the smaller the driving force of the first driving piece is; the lower the water temperature in the water outlet channel is, the larger the driving force of the first driving piece is;

when the valve core moves towards the first position, the driving force of the first driving piece is larger than that of the second driving piece, and the opening degree of the overflow hole is reduced; when the valve core moves towards the second position, the driving force of the first driving member is smaller than that of the second driving member, and the opening degree of the overflow hole is increased.

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 valve core is controlled to move relative to the fixed seat by adjusting the driving force applied by the first driving piece to the valve core, so that the opening of the overflow hole is changed, the opening of the bypass channel is adjusted, 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, at the moment, the driving force applied by the first driving part to the valve core is minimum and smaller than the driving force applied by the second driving part to the valve core, the opening of the overflow hole is maximum, and the valve core is positioned at the second position. When normal water use is resumed, the water temperature is stable and lower than the initial temperature, so that excessive cold water does not need to be added into the water outlet channel, at the moment, the driving force applied by the first driving piece to the valve core is maximum and larger than the driving force applied by the second driving piece to the valve core, the opening of the overflow hole is minimum, and the valve core is positioned at the first position.

Preferably, the fixing seat is a hollow cylindrical member, the valve core is arranged on the inner peripheral side of the fixing seat, and the outer peripheral wall of the valve core is abutted with the inner peripheral wall of the fixing seat;

the first driving piece is connected to one end face of the valve core, which faces the water outlet channel, and is used for applying driving force to the valve core, which moves towards the water inlet channel; the second driving piece is connected to one end face of the valve core, which faces the water inlet channel, and is used for applying driving force to the valve core, which moves towards the water outlet channel.

In this scheme, the inside of fixing base can provide more setting space for the case to make the area of contact of first driving piece, second driving piece and case bigger, improve the stability of case removal in-process.

Preferably, the fixing seat comprises a flow limiting cover and a first axial end plate, the first axial end plate is arranged on one side of the valve core facing the water outlet channel and is connected with the end part of the flow limiting cover, and the inner peripheral wall of the flow limiting cover is abutted with the outer peripheral wall of the valve core;

the first driving piece is a thermosensitive spring, and two ends of the thermosensitive spring in the axial direction of the bypass channel are respectively abutted to the first axial end plate and the valve core.

In this scheme, the heat-sensitive spring has elasticity and increases with the temperature and reduce characteristic, can adjust self elasticity according to the temperature that senses to the removal of control case.

Preferably, the heat sensitive spring at least partially extends into the water outlet channel.

In this scheme, temperature in the water channel can be felt more accurately to the thermosensitive spring, makes the elasticity adjustment of thermosensitive spring more accurate, can more accurately adjust the aperture of overflow hole.

Preferably, the first axial end plate is located in the water outlet channel, and a first through hole penetrating in the axial direction of the bypass channel is formed in the first axial end plate.

In this scheme, first through-hole is used for in the cold water input water outlet channel that introduces from the inlet channel on the one hand, and on the other hand can make the hot water flow through heat-sensitive spring in the water outlet channel, improves the accuracy of the temperature that heat-sensitive spring felt, makes heat-sensitive spring's elasticity adjustment more accurate, can more accurately adjust the aperture in overflow hole.

Preferably, the flow limiting cover is provided with a water passing section extending into the water outlet channel, and a second through hole penetrating in the radial direction of the bypass channel is arranged on the water passing section.

In this scheme, the second through-hole is arranged in the cold water input water outlet channel that will introduce from the inlet channel on the one hand, and on the other hand can make the hot water flow through the thermosensitive spring in the water outlet channel, improves the accuracy of the temperature that thermosensitive spring felt, makes thermosensitive spring's elasticity adjustment more accurate, can more accurately adjust the aperture in overflow hole.

Preferably, the fixing seat further comprises a second axial end plate, and the second axial end plate is arranged on one side of the valve core facing the water inlet channel and is connected with the end part of the flow limiting cover;

the second driving piece is a spring, and two ends of the spring in the axial direction of the bypass channel are respectively abutted against the second axial end plate and the valve core.

In the scheme, the movement of the driving valve core is realized by the elasticity of the spring. When the elastic force of the spring is smaller than that of the thermosensitive spring, the valve core moves towards the first position. When the elastic force of the spring is larger than that of the thermosensitive spring, the valve core moves towards the second position.

Preferably, the spool is provided with a first guide groove and a second guide groove at two ends of the bypass channel in the axial direction respectively; the heat-sensitive spring is at least partially accommodated in the first guide groove, and the periphery of the heat-sensitive spring is abutted with the groove wall of the first guide groove; the spring is at least partially accommodated in the second guide groove, and the periphery of the spring is abutted with the groove wall of the second guide groove.

In this scheme, first guide slot plays spacing effect of direction to heat-sensitive spring, prevents that heat-sensitive spring from producing the skew at compression or release elasticity's in-process, improves the reliability of adjusting. The second guide groove plays a role in guiding and limiting the spring, so that the spring is prevented from deviating in the process of compressing or releasing the elastic force, and the reliability of adjustment is improved.

Preferably, the bypass valve further comprises a limiting portion, the limiting portion protrudes from the inner peripheral wall of the fixing seat to the radial inner side of the fixing seat, the limiting portion is arranged on one side of the valve core towards the first position, and one side surface of the valve core towards the first position in the axis direction of the bypass channel can be abutted to the limiting portion.

In this scheme, limit part is used for controlling the range of movement of case, avoids the case that the case excessively moves and leads to the overflow hole to close completely towards inlet channel one side, guarantees the normal use of bypass valve.

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 case slides for the fixing base in order to reduce the aperture of overflow hole, thereby after the one section hot water that the 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 utility model 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 valve core is controlled to move relative to the fixed seat by adjusting the driving force applied by the first driving piece to the valve core, so that the opening of the overflow hole is changed, the opening of the bypass channel is adjusted, 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, at the moment, the driving force applied by the first driving part to the valve core is minimum and smaller than the driving force applied by the second driving part to the valve core, the opening of the overflow hole is maximum, and the valve core is positioned at the second position. When normal water use is resumed, the water temperature is stable and lower than the initial temperature, so that excessive cold water does not need to be added into the water outlet channel, at the moment, the driving force applied by the first driving piece to the valve core is maximum and larger than the driving force applied by the second driving piece to the valve core, the opening of the overflow hole is minimum, and the valve core is positioned at the first position.

Drawings

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

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

Fig. 3 is a schematic diagram showing an internal structure of a bypass valve when the opening of an overflow hole is at a minimum in an embodiment of the utility model.

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

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

Fig. 6 is a schematic view showing an internal structure of the bypass valve after the opening of the overflow hole is increased according to an embodiment of the utility model.

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

First projection 32

Second projection 33

First guide groove 34

Second guide groove 35

Fixing base 4

Flow restrictor cap 41

Water section 411

Second through hole 412

First axial end plate 42

First through hole 421

Second axial end plate 43

First driving member 51

Second driving member 52

Limit part 6

Water flow space 7

Flow-through hole 8

Detailed Description

The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.

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 5, the bypass valve 16 includes a valve body 2, a valve spool 3, a fixed seat 4, an overflow hole 8, a first driver 51, a second driver 52, and a stopper 6.

As shown in fig. 2, 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 and 6, the valve element 3 is provided in the bypass passage 23, and the valve element 3 is provided so as to be movable with respect 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 realizing adjustment of 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 8 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 8. 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 between a first position and a second position relative to the fixed seat 4 so as to adjust the shielding range of the overflow hole 8. When the spool 3 moves toward the first position, the opening degree of the orifice 8 decreases; when the valve spool 3 moves toward the second position, the opening degree of the orifice 8 increases; thereby adjusting the opening of the overflow hole 8 and further realizing the adjustment of the opening of the bypass passage 23.

Specifically, as shown in fig. 3 to 5, the holder 4 is a hollow cylindrical member, and the valve element 3 is provided on the inner peripheral side of the holder 4. The fixing seat 4 includes a flow limiting cover 41, a first axial end plate 42, and a second axial end plate 43, the first axial end plate 42 is provided on a side of the valve body 3 facing the water outlet passage 22 and connected to an end of the flow limiting cover 41, and the second axial end plate 43 is provided on a side of the valve body 3 facing the water inlet passage 21 and connected to an end of the flow limiting cover 41. The outer circumferential wall of the valve core 3 abuts against the inner circumferential wall of the flow limiting cover 41, and the abutting means that the gap between the outer circumferential wall of the valve core 3 and the inner circumferential wall of the flow limiting cover 41 is small so as to reduce the gap flow of water flow between the two, but the gap between the outer circumferential wall of the valve core 3 and the inner circumferential wall of the flow limiting cover 41 cannot be completely eliminated, otherwise the smoothness of sliding of the valve core 3 relative to the fixed seat 4 is affected.

As shown in fig. 3 and 5, the flow limiting cover 41, the first axial end plate 42 and the second axial end plate 43 enclose a hollow water flow space 7, the fixing seat 4 is further provided with a plurality of through holes, the water flow space 7 is communicated with the water outlet channel 22 through the through holes, cold water flowing from the water inlet channel 21 can only flow into the water flow space 7 through the overflow holes 8 and can only flow into the water outlet channel 22 through the through holes, and then the cold water flow flowing into the water outlet channel 22 is regulated by regulating the opening of the overflow holes 8.

In other alternative embodiments, the diameter of the valve core 3 may be larger than that of the fixing seat 4, the valve core 3 is sleeved on the outer peripheral side of the fixing seat 4, and the inner peripheral wall of the valve core 3 abuts against the outer peripheral wall of the fixing seat 4.

As shown in fig. 3, 5 and 6, a first driving member 51 is connected to the valve body 3, and the first driving member 51 is configured to apply a force to move the valve body 3 toward the first position. Specifically, the first driving member 51 is connected to one end surface of the valve body 3 toward the water outlet passage 22, for applying a driving force to the valve body 3 for movement toward the water inlet passage 21. Wherein the first driving member 51 is provided to be able to adjust the magnitude of the driving force applied to the valve cartridge 3 according to the water temperature in the water outlet passage 22. The higher the water temperature in the water outlet passage 22, the smaller the driving force of the first driving member 51; the lower the water temperature in the water outlet passage 22, the greater the driving force of the first driving member 51.

As shown in fig. 3, 5 and 6, a second driving member 52 is connected to the spool 3, and the second driving member 52 is configured to apply a force to the spool 3 in the direction toward the second position. Specifically, the second driving member 52 is connected to one end surface of the valve body 3 toward the water inlet passage 21 for applying a driving force to the valve body 3 for movement toward the water outlet passage 22.

When the valve body 3 moves toward the first position, the driving force of the first driving member 51 is greater than the driving force of the second driving member 52, and the opening degree of the orifice 8 decreases. When the valve body 3 moves toward the second position, the driving force of the first driver 51 is smaller than the driving force of the second driver 52, and the opening degree of the orifice 8 increases. In this embodiment, the valve core 3 is controlled to move relative to the fixed seat 4 by adjusting the driving force applied to the valve core 3 by the first driving member 51, so as to change the opening of the overflow hole 8, realize the opening adjustment of the bypass channel 23, and adjust the flow of cold water entering the water outlet channel 22 from the water inlet channel 21.

When water is reused after water is stopped and the temperature is raised, more cold water needs to be added to the water outlet channel 22 because the initial water temperature in the water outlet channel 22 is higher, at this time, the driving force applied by the first driving piece 51 to the valve core 3 is minimum and smaller than the driving force applied by the second driving piece 52 to the valve core 3, the opening degree of the overflow hole 8 is maximum, and the valve core 3 is positioned at the second position. When normal water use is resumed, since the water temperature is stable and lower than the initial temperature, it is not necessary to add excessive cold water to the water outlet passage 22, and at this time, the driving force applied to the valve element 3 by the first driving member 51 is maximum and greater than the driving force applied to the valve element 3 by the second driving member 52, the opening degree of the overflow hole 8 is minimum, and the valve element 3 is located at the first position.

As shown in fig. 3 and 5, the first driver 51 in the present embodiment is a thermo-sensitive spring, and both ends of the thermo-sensitive spring in the axial direction of the bypass passage 23 are respectively abutted against the first axial end plate 42 and the valve element 3. The heat sensitive spring has the characteristic that the elasticity is reduced along with the temperature rise, and can adjust the elasticity according to the sensed water temperature, so as to control the movement of the valve core 3.

Further, as shown in fig. 3 and 5, the spool 3 includes a spool body 31 and a first protruding portion 32, the first protruding portion 32 protruding outward from the spool body 31 toward one end of the water outlet passage 22 in the axial direction of the bypass passage 23 to form a first guide groove 34, a heat sensitive spring is accommodated in the first guide groove 34 toward one end of the spool 3, and the outer periphery of the heat sensitive spring abuts against the groove wall of the first guide groove 34. The first guide groove 34 plays a role in guiding and limiting the thermosensitive spring, prevents the thermosensitive spring from shifting in the process of compressing or releasing the elastic force, and improves the reliability of adjustment.

Further, as shown in fig. 3, the flow limiting cover 41 has a water passing section 411 extending into the water outlet channel 22, the first axial end plate 42 is located in the water outlet channel 22 and connected with the water passing section 411, and one end of the heat-sensitive spring, far away from the valve core 3, extends into the water outlet channel 22, so that the heat-sensitive spring can sense the water temperature in the water outlet channel 22 more accurately, the elastic adjustment of the heat-sensitive spring is more accurate, and the opening of the overflow hole 8 can be adjusted more accurately.

As shown in fig. 3 and 5, the first axial end plate 42 is provided with a first through hole 421 penetrating in the axial direction of the bypass passage 23, and the water passing section 411 is provided with a second through hole 412 penetrating in the radial direction of the bypass passage 23. The first through hole 421 and the second through hole 412 are used for inputting cold water introduced from the water inlet channel 21 into the water outlet channel 22, and enabling hot water in the water outlet channel 22 to flow through the heat-sensitive spring, improving accuracy of water temperature sensed by the heat-sensitive spring, enabling elastic adjustment of the heat-sensitive spring to be more accurate, and enabling opening of the overflow hole 8 to be more accurately adjusted.

In other alternative embodiments, the first driving member 51 may be other driving structures capable of achieving the above-described functions.

As shown in fig. 3 and 5, the second driving member 52 in the present embodiment is a spring, both ends of which in the axial direction of the bypass passage 23 are respectively abutted against the second axial end plate 43 and the valve element 3, and the movement of the valve element 3 is driven by the elastic force of the spring. Specifically, when the elastic force of the spring is smaller than that of the heat-sensitive spring, the spool 3 moves toward the first position; when the spring force of the spring is greater than the spring force of the heat sensitive spring, the spool 3 moves toward the second position. Wherein the second driving member 52 may be a conventional spring and need not follow a temperature change.

Further, as shown in fig. 3 and 5, the spool 3 further includes a second protruding portion 33, the second protruding portion 33 protruding outward from the spool body 31 toward an end face of the water intake passage 21 in the axial direction of the bypass passage 23 to form a second guide groove 35, a spring is accommodated in the second guide groove 35 toward an end of the spool 3, and an outer periphery of the spring abuts against a groove wall of the second guide groove 35. The second guide groove 35 plays a role in guiding and limiting the spring, prevents the spring from deviating in the process of compressing or releasing the elastic force, and improves the reliability of adjustment.

In other alternative embodiments, the second driving member 52 may be other driving structures capable of performing the above-described functions.

Compared with the valve core 3 arranged on the outer peripheral side of the fixed seat 4, the inner part of the fixed seat 4 can provide more arrangement space for the valve core 3, so that the contact area of the thermosensitive spring, the spring and the valve core 3 is larger, and the stability of the valve core 3 in the moving process is improved.

As shown in fig. 4 and 5, the limiting portion 6 protrudes radially inward of the fixing seat 4 from the inner peripheral wall of the fixing seat 4, the limiting portion 6 is provided on a side of the valve element 3 facing the first position, that is, the limiting portion 6 is provided on a side of the valve element 3 facing the water inlet passage 21, and one side surface of the valve element 3 facing the water inlet passage 21 in the axial direction of the bypass passage 23 can abut against the limiting portion 6. The limiting part 6 is used for controlling the movement range of the valve core 3, avoiding the situation that the overflow hole 8 is completely closed due to excessive movement of the valve core 3 towards one side of the water inlet channel 21, and ensuring the normal use of the bypass valve 16.

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, since the initial water temperature in the water outlet passage 22 is high, the elasticity of the heat sensitive spring is low, and the elasticity of the heat sensitive spring is smaller than that of the spring, as shown in fig. 6, at which the opening of the overflow hole 8 is maximum, the valve core 3 is at the second position, and the amount of cold water flowing from the water inlet passage 21 into the water outlet passage 22 is 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 to normal water use gradually, more cold water is not needed to be poured into the water outlet channel 22, so as shown in fig. 3, as the water temperature in the water outlet channel 22 is reduced, the elasticity of the thermosensitive spring is enhanced, the elasticity of the thermosensitive spring is larger than that of the spring, the valve core 3 moves towards the direction of the water inlet channel 21 under the action of the thermosensitive spring, the opening of the overflow hole 8 is gradually reduced until the elasticity of the thermosensitive spring is balanced with that of the spring, at the moment, the opening of the overflow hole 8 is minimum, the valve core 3 is at the first position, the inflow amount of cold water is minimum, and other problems caused by large bypass flow, such as direct outflow of cold water without heating, water boiling caused by small flow through the heat exchanger 13, and the like, are avoided. When the water is turned off again, the first restoring member drives the valve body 3 to move toward the water inlet passage 21, thereby increasing the opening degree of the overflow hole 8 to the maximum.

While specific embodiments of the utility model 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 utility model 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 utility model, but such changes and modifications fall within the scope of the utility model.

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 first driving piece and a second driving piece;

2. The bypass valve as recited in claim 1, wherein the holder is a hollow cylindrical member, the spool is provided on an inner peripheral side of the holder, and an outer peripheral wall of the spool abuts against an inner peripheral wall of the holder;

3. The bypass valve as recited in claim 2, wherein the fixed seat includes a restrictor cover and a first axial end plate provided on a side of the spool facing the water outlet passage and connected to an end of the restrictor cover, an inner peripheral wall of the restrictor cover abutting an outer peripheral wall of the spool;

4. A bypass valve as recited in claim 3, wherein the thermally sensitive spring extends at least partially into the water outlet passage.

5. The bypass valve as recited in claim 4, wherein the first axial end plate is located in the water outlet passage, and a first through hole penetrating in an axial direction of the bypass passage is provided in the first axial end plate.

6. A bypass valve as claimed in claim 4 or 5, wherein the restrictor has a water passage extending into the outlet passage, the water passage being provided with a second through hole extending therethrough in a radial direction of the bypass passage.

7. The bypass valve as recited in claim 3 wherein the mounting further includes a second axial end plate disposed on a side of the spool facing the water inlet passage and connected to an end of the restrictor;

8. The bypass valve as recited in claim 7, wherein both ends of the spool in the axial direction of the bypass passage are provided with a first guide groove and a second guide groove, respectively; the heat-sensitive spring is at least partially accommodated in the first guide groove, and the periphery of the heat-sensitive spring is abutted with the groove wall of the first guide groove; the spring is at least partially accommodated in the second guide groove, and the periphery of the spring is abutted with the groove wall of the second guide groove.

9. The bypass valve according to claim 2, further comprising a stopper portion protruding radially inward of the holder from an inner peripheral wall of the holder, the stopper portion being provided on a side of the spool facing the first position, a side of the spool facing the first position in an axial direction of the bypass passage being capable of abutting against the stopper portion.

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