CN116428378A - Bypass valve and water heater comprising same - Google Patents

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 connecting cavity and a first resetting piece, and the valve core can move relative to the valve body to adjust the opening of a bypass channel; the connecting cavity is provided with a deformable cavity, a flexible buffer member is filled in the cavity, the valve core part stretches into the cavity to be in butt joint with the flexible buffer member, the valve core extrudes the flexible buffer member towards one side surface of the first position so as to deform the flexible buffer member and the cavity, the flexible buffer member can slow down the sliding speed of the valve core, and the first reset member 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 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.

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 connecting cavity and a first 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 between a first position and a second position relative to the fixed seat; when the valve core moves towards the first position, the opening degree of the overflow hole is reduced; when the valve core moves towards the second position, the opening degree of the overflow hole is increased;

the connecting chamber is fixed on the valve body and is positioned at one side of the valve core towards the first position, the connecting chamber is provided with a deformable cavity, a flexible buffer member is filled in the cavity, the valve core part stretches into the cavity to be abutted with the flexible buffer member, and when the valve core moves towards the first position, the valve core presses the flexible buffer member towards one side of the first position so as to deform the flexible buffer member and the cavity;

the first reset piece is connected with the valve core, and the first reset piece is used for applying acting force towards the second position direction to the valve core.

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 opening of the overflow hole is changed through the sliding of the valve core relative to the fixed seat, so that 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, and at the moment, 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, 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, and the valve core is positioned at the first position. Because the valve core can extrude the flexible buffer member when moving to the first position, consequently the flexible buffer member can exert reverse effort to the valve core, slows down the speed that the valve core slided for the fixing base under the same circumstances of the actuating force that the valve core received for when the hot water is just started out to the water outlet channel, bypass channel keeps the biggest excessive volume in order to provide sufficient cold water neutralization hot water.

Preferably, the flexible cushioning member is a non-newtonian fluid.

In the scheme, the non-Newtonian fluid can be adapted to cavities with various shapes on one hand, the flexibility is higher, and on the other hand, the sliding speed of the valve core relative to the fixed seat can be well slowed down due to the characteristics of the non-Newtonian fluid, the too fast reduction of the opening of the overflow hole caused by the too fast movement of the valve core is avoided, and the bypass channel keeps the maximum overflow amount so as to provide enough cold water and hot water.

Preferably, the connecting chamber comprises a fixing part and a moving part, the fixing part is fixed on the valve body, the moving part is movable relative to the fixing part, and the fixing part and the moving part enclose the cavity.

In this embodiment, the shape of the cavity is changed by moving the moving part relative to the fixed part, thereby changing the shape of the non-newtonian fluid in the cavity.

Preferably, the valve core comprises a first flow limiting cover and an adjusting rod, and the adjusting rod is arranged on the inner peripheral side of the first flow limiting cover and is fixed on an axial end plate of the first flow limiting cover;

the fixed seat is arranged on the inner peripheral side of the first flow-limiting cover, the fixed seat comprises a second flow-limiting cover, and the outer peripheral wall of the second flow-limiting cover is abutted with the inner peripheral wall of the first flow-limiting cover;

the connecting chamber is arranged on the inner peripheral side of the fixed seat, the fixed part is fixed on the inner peripheral wall of the second flow limiting cover, the moving part is arranged on one side of the fixed part in the axial direction of the bypass channel, the outer peripheral wall of the moving part is abutted with the inner peripheral wall of the second flow limiting cover, and the moving part can move along the axial direction of the bypass channel relative to the fixed part;

the fixing part, the moving part and the inner peripheral wall of the second flow limiting cover enclose a cavity, and the adjusting rod part extends into the cavity.

In this scheme, above-mentioned setting can provide sufficient setting space for connecting the cavity, guarantees that the cavity has sufficient volume to hold non-Newtonian fluid to improve the non-Newtonian fluid to the action time of case, the time that the orifice aperture reduces excessively is prolonged.

Preferably, the bypass valve further comprises a second reset piece, the fixing seat further comprises a first limiting portion, the first limiting portion is connected with the second flow limiting cover and located on one side, away from the fixed portion, of the moving portion, two ends, in the axial direction of the bypass channel, of the second reset piece are respectively abutted to the moving portion and the first limiting portion, and the second reset piece is used for applying acting force towards the direction of the fixed portion to the moving portion.

In this scheme, the second piece that resets is used for realizing the reset of movable part for movable part can also reset the light dress that changes the cavity after the case moves to reset towards the second position, thereby changes the shape of non-Newtonian fluid in the cavity, and the convenience is when the case moves towards first position again, and non-Newtonian fluid can continue to slow down the slip velocity of case for the fixing base.

Preferably, the fixing seat further comprises a second limiting part, the second limiting part is fixedly connected with the second flow limiting cover and is located on one side of the moving part facing the fixing part, and the second limiting part faces one end face of the moving part in the axis direction of the bypass channel and can be abutted to the moving part.

In this scheme, the second spacing portion is used for restricting the excessive removal of moving part towards the fixed part direction.

Preferably, the fixing seat further comprises an adjusting channel, the adjusting channel extends along the axis direction of the bypass channel, the adjusting channel is connected to one side surface of the first limiting part, which faces the moving part, the moving part is sleeved on the adjusting channel, and the inner peripheral wall of the moving part is abutted to the outer peripheral wall of the adjusting channel;

the fixed part, the moving part, the inner peripheral wall of the second flow limiting cover and the inner peripheral wall of the adjusting channel enclose the cavity.

In the scheme, the adjusting channel can play a role in moving and guiding the moving part, and the moving part is prevented from shifting in the moving process.

Preferably, the fixing portion is disposed on one side of the moving portion away from the adjusting rod, a through hole penetrating through the bypass channel in the axial direction is formed in the first limiting portion, the through hole is communicated with the adjusting channel, and the adjusting rod extends into the adjusting channel through the through hole.

In this scheme, adjust the pole and can play shutoff regulation passageway's effect, prevent the non-Newtonian fluid in the cavity and flow. The adjusting channel can play a role in moving and guiding the adjusting rod, and the offset is prevented in the moving process of the adjusting rod.

Preferably, the fixing seat further comprises a third limiting part extending from the inner peripheral wall of the adjusting channel to the radial inner side of the adjusting channel;

the valve core further comprises a fourth limiting part, the fourth limiting part extends from the outer circumferential wall of the adjusting rod to the radial outer side of the adjusting rod, the fourth limiting part is arranged in the adjusting channel, and one end face, far away from the fixing part, of the fourth limiting part in the axis direction of the bypass channel can be abutted to the third limiting part.

In this scheme, above-mentioned setting is used for preventing to adjust the pole and shifts out the regulation passageway, on the one hand can prevent that the non-Newtonian fluid in the cavity from flowing out, on the other hand can remain the cooperation relation of adjusting pole and regulation passageway all the time, avoids both to produce the interference.

Preferably, two ends of the first reset piece in the axial direction of the bypass channel are respectively abutted against the first limiting part and the axial end plate of the first flow limiting cover.

In this scheme, first reset piece is through applying the effort of keeping away from first spacing portion direction to the axial end plate of first current-limiting cover for the case moves towards the direction of keeping away from the fixing base, realizes the reset of case, makes things convenient for the next removal of case.

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 valve core is arranged at one side of the bypass channel close to the water inlet channel, the fixed seat is arranged at one side of the bypass channel close to the water outlet channel, and the valve core is arranged to be capable of moving towards the direction of the water outlet channel under the action of water flow;

when the valve core moves towards the direction of the water outlet channel, the opening of the overflow hole is reduced; when the valve core moves towards the water inlet channel, the opening degree of the overflow hole is increased.

In this scheme, when the water inlet channel is to bypass channel water inflow, the case can be under the rivers effect the orientation removal of water outlet channel to realize the aperture adjustment in overflow hole, need not set up other drive structure in addition, simplify the overall structure of bypass valve, reduce cost.

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 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 opening of the overflow hole is changed through the sliding of the valve core relative to the fixed seat, so that 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, and at the moment, 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, 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, and the valve core is positioned at the first position. Because the valve core can extrude the flexible buffer member when moving to the first position, consequently the flexible buffer member can exert reverse effort to the valve core, slows down the speed that the valve core slided for the fixing base under the same circumstances of the actuating force that the valve core received for when the hot water is just started out to the water outlet channel, bypass channel keeps the biggest excessive volume in order to provide sufficient cold water neutralization hot water.

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 view showing an internal structure of the bypass valve after the opening of the overflow hole is reduced according to 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

First flow-restricting cover 31

Adjusting lever 32

Fourth limit part 33

Fixing base 4

Second flow restrictor panel 41

First through hole 411

First limiting portion 42

Second through hole 421

Regulating channel 43

Second limit part 44

Third limit part 45

Flow-through holes 5

Connection chamber 6

Flexible buffer 61

Fixing portion 62

Moving part 63

Cavity 64

First restoring member 71

Second reset element 72

Water flow space 8

Guide groove 91

Guide block 92

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 5, the bypass valve 16 includes a valve body 2, a spool 3, a fixed seat 4, an overflow hole 5, a connection chamber 6, a first restoring member 71, and a second restoring member 72.

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, 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 between a first position and a second position relative to the fixed seat 4. When the spool 3 moves toward the first position, the opening degree of the orifice 5 decreases; when the valve spool 3 moves toward the second position, the opening degree of the overflow hole 5 increases; thereby adjusting the opening of the overflow hole 5 and further realizing the adjustment of the opening of the bypass passage 23.

Specifically, as shown in fig. 3 to 5, the valve core 3 includes a first flow-limiting cover 31, the fixed seat 4 is provided on an inner peripheral side of the first flow-limiting cover 31, the fixed seat 4 includes a second flow-limiting cover 41, the flow-through holes 5 are provided on a peripheral side wall of the second flow-limiting cover 41, and both ends of the flow-through holes 5 in a radial direction of the fixed seat 4 penetrate through the peripheral side wall of the second flow-limiting cover 41. The outer circumferential wall of the second flow-limiting cover 41 abuts against the inner circumferential wall of the first flow-limiting cover 31, where abutting means that the gap between the inner circumferential wall of the first flow-limiting cover 31 and the outer circumferential wall of the second flow-limiting cover 41 is small, so as to reduce the gap flow of water flow between the two, but the inner circumferential wall of the first flow-limiting cover 31 and the outer circumferential wall of the second flow-limiting cover 41 cannot completely have no gap, otherwise the smoothness of sliding of the valve core 3 relative to the fixed seat 4 is affected. The first flow limiting cover 31 and the second flow limiting cover 41 form a hollow water flow space 8, the second flow limiting cover 41 is further provided with a plurality of first through holes 411, the water flow space 8 is communicated with the water outlet channel 22 through the first through holes 411, cold water flowing in from the water inlet channel 21 can only flow into the water flow space 8 through the overflow holes 5 and can only flow into the water outlet channel 22 through the first through holes 411, and then the cold water flow flowing into the water outlet channel 22 is adjusted by adjusting the opening of the overflow holes 5.

In other alternative embodiments, the flow-through hole 5 may be provided in the peripheral side wall of the first flow-restricting cap 31, and both ends of the flow-through hole 5 in the radial direction of the spool 3 penetrate the peripheral side wall of the first flow-restricting cap 31. Alternatively, the diameter of the second flow restrictor 41 may be larger than that of the first flow restrictor 31, and the second flow restrictor 41 may be fitted over the outer peripheral surface of the first flow restrictor 31.

As shown in fig. 3, the fixing seat 4 in the present embodiment 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 near the water inlet channel 21, and the valve core 3 moves toward the water outlet channel 22 under the action of water flow. Specifically, when the water inlet channel 21 is feeding water to the bypass channel 23, the valve core 3 can move towards the direction of the water outlet channel 22 under the action of water flow, namely, move towards the first position, the opening degree of the overflow hole 5 is reduced, and when the valve core 3 is at the first position, the opening degree of the overflow hole 5 is minimum; when the water inlet channel 21 stops water inlet, the valve core 3 moves towards the direction of the water inlet channel 21 under the action of the first reset piece 71, namely moves towards the second position, the opening degree of the overflow hole 5 is increased, and when the valve core 3 is positioned at the second position, the opening degree of the overflow hole 5 is maximum; thereby realizing the opening adjustment of the overflow hole 5, no other driving structure is needed to be additionally arranged, simplifying the whole structure of the bypass valve 16 and reducing the cost.

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 is disposed at one end of the bypass channel 23 near the water outlet channel 22, where the valve core 3 may be driven by an independent driving structure to realize sliding relative to the fixing seat 4.

As shown in fig. 3, 5 and 6, the connecting chamber 6 is fixed on the valve body 2 and is located at a side of the valve core 3 facing the first position, the connecting chamber 6 has a deformable cavity 64, the cavity 64 is filled with a flexible buffer member 61, the valve core 3 partially extends into the cavity 64 to abut against the flexible buffer member 61, and when the valve core 3 moves toward the first position, the valve core 3 presses the flexible buffer member 61 toward a side of the first position to deform the flexible buffer member 61 and the cavity 64.

Specifically, as shown in fig. 3, 5 and 6, the connection chamber 6 is provided on the inner peripheral side of the second flow restricting cover 41 and is located on the side of the valve spool 3 facing the water outlet passage 22, the connection chamber 6 includes a fixed portion 62 and a moving portion 63, the fixed portion 62 is fixed on the inner peripheral wall of the second flow restricting cover 41, the moving portion 63 is provided on the side of the fixed portion 62 facing the water inlet passage 21 in the axial direction of the bypass passage 23, the outer peripheral wall of the moving portion 63 abuts against the inner peripheral wall of the second flow restricting cover 41, and the fixed portion 62, the moving portion 63 and the inner peripheral wall of the second flow restricting cover 41 enclose a cavity 64. The moving portion 63 is movable in the axial direction of the bypass passage 23 with respect to the fixed portion 62, thereby effecting a change in the shape of the cavity 64. Here, the abutment of the outer peripheral wall of the moving portion 63 with the inner peripheral wall of the second flow restricting cover 41 means that the gap between the outer peripheral wall of the moving portion 63 and the inner peripheral wall of the second flow restricting cover 41 is small to prevent the flexible buffer 61 in the cavity 64 from flowing out of the gap therebetween, but the gap between the outer peripheral wall of the moving portion 63 and the inner peripheral wall of the second flow restricting cover 41 cannot be completely eliminated, otherwise the smoothness of sliding of the moving portion 63 with respect to the fixed portion 62 is affected.

As shown in fig. 3, 5 and 6, the valve core 3 further includes an adjusting rod 32, the adjusting rod 32 is disposed on the inner peripheral side of the first flow-limiting cover 31 and is fixed on an axial end plate of the first flow-limiting cover 31, and the adjusting rod 32 partially extends into the cavity 64 to press the flexible buffer member 61 in the cavity 64, so that the flexible buffer member 61 deforms to push the moving part 63 to move, change the shape of the cavity 64, and release the acting force applied to the flexible buffer member 61. Since the spool 3 presses the flexible buffer 61 when moving to the first position, the flexible buffer 61 applies a reverse force to the spool 3, and the spool 3 slows down the sliding speed of the spool 3 relative to the fixed seat 4 under the condition that the spool 3 receives the same driving force from the water flow, so that the bypass channel 23 maintains the maximum overflow to provide enough cold water and hot water when the hot water outlet channel 22 just starts to outlet.

The flexible buffer member 61 in this embodiment is a non-newtonian fluid, which can adapt to the cavity 64 with various shapes, and has higher flexibility, and on the other hand, due to the characteristics of the non-newtonian fluid, the sliding speed of the valve core 3 relative to the fixed seat 4 can be well slowed down, so that the too fast decrease of the opening of the overflow hole 5 caused by the too fast movement of the valve core 3 is avoided, and the bypass channel 23 keeps the maximum overflow to provide enough cold water and hot water.

In other alternative embodiments, the flexible buffer 61 may be other structures capable of performing the above functions.

In other alternative embodiments, the connection chamber 6 may be disposed at the outer peripheral side of the second flow-limiting cover 41, and the end of the first flow-limiting cover 31 facing the water outlet passage 22 extends into the cavity 64 to abut against the flexible buffer member 61. In this embodiment, the connection chamber 6 is disposed inside the second flow restrictor 41, so as to provide enough space for the connection chamber 6, and ensure that the cavity 64 has enough volume to accommodate the non-newtonian fluid, thereby increasing the acting time of the non-newtonian fluid on the valve core 3, and prolonging the time for decreasing the opening of the flow-through hole 5.

In other alternative embodiments, the moving portion 63 may also be provided at a side of the fixed portion 62 toward the water outlet passage 22 in the axial direction of the bypass passage 23.

As shown in fig. 3 and 5, a first restoring member 71 is connected to the valve body 3, and the first restoring member 71 is configured to apply a force to the valve body 3 in the direction toward the second position. Specifically, the first restoring member 71 in the present embodiment is a spring, the fixing base 4 further includes a first limiting portion 42, the first limiting portion 42 is connected to the second flow-limiting cover 41 and located on a side of the moving portion 63 away from the fixed portion 62, and two ends of the first restoring member 71 in the axial direction of the bypass channel 23 are respectively abutted to the first limiting portion 42 and an axial end plate of the first flow-limiting cover 31. When the valve core 3 moves towards the fixed seat 4, the first reset piece 71 is stressed and compressed, and when water is stopped, the elastic force of the first reset piece 71 is released, so that the valve core 3 is driven to move towards the direction away from the fixed seat 4, the reset of the valve core 3 is realized, and the next movement of the valve core 3 is facilitated.

In other alternative embodiments, the first restoring member 71 may be another elastic member capable of achieving the above-described function.

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 at the moment, the opening of the overflow hole 5 is maximum, and the valve core 3 is positioned at the second position. When normal water use is resumed, the valve core 3 slides relative to the fixed seat 4 to reduce the opening of the overflow hole 5 because the water temperature is stable and excessive cold water is not needed to be added to the water outlet channel 22, and the valve core 3 is positioned at the first position.

As shown in fig. 3 and 5, the bypass valve 16 further includes a second return piece 72, both ends of the second return piece 72 in the axial direction of the bypass passage 23 are respectively abutted against the moving portion 63 and the first stopper portion 42, and the second return piece 72 is for applying a force to the moving portion 63 in the direction toward the fixed portion 62. Specifically, the second restoring member 72 in the present embodiment is a spring, when the valve core 3 moves toward the fixed seat 4, the adjusting rod 32 presses the non-newton fluid, so that the structure of the non-newton fluid is changed to drive the moving portion 63 to move toward the first limiting portion 42, and the second restoring member 72 is compressed under force. When water stops, the valve core 3 resets under the action of the first resetting piece 71, the regulating rod 32 does not squeeze the non-newtonian fluid any more, the action force from the non-newtonian fluid received by the moving part 63 is smaller than the action force received by the second resetting piece 72, the elastic force of the second resetting piece 72 is released, and the moving part 63 is driven to move towards the direction of the fixed part 62, so that the resetting of the moving part 63 is realized, and when the valve core 3 moves towards the first position again, the non-newtonian fluid can continuously slow down the sliding speed of the valve core 3 relative to the fixed seat 4 conveniently.

As shown in fig. 3 and 5, the fixing seat 4 further includes an adjusting channel 43, the adjusting channel 43 extends along the axis direction of the bypass channel 23, the adjusting channel 43 is connected to a side surface of the first limiting portion 42 facing the moving portion 63, the moving portion 63 is sleeved on the adjusting channel 43, an inner peripheral wall of the moving portion 63 abuts against an outer peripheral wall of the adjusting channel 43, and the adjusting channel 43 can play a role in moving and guiding the moving portion 63, so that the moving portion 63 is prevented from being offset in the moving process. The fixed portion 62, the moving portion 63, the inner peripheral wall of the second flow restricting cover 41, and the inner peripheral wall of the adjustment passage 43 enclose a cavity 64. Here, the abutment of the inner peripheral wall of the moving portion 63 with the outer peripheral wall of the adjustment passage 43 means that the gap between the inner peripheral wall of the moving portion 63 and the outer peripheral wall of the adjustment passage 43 is small to prevent the flexible buffer member 61 in the cavity 64 from flowing out of the gap therebetween, but the gap between the inner peripheral wall of the moving portion 63 and the outer peripheral wall of the adjustment passage 43 cannot be completely eliminated, otherwise the smoothness of the sliding of the moving portion 63 with respect to the fixed portion 62 is affected.

As shown in fig. 3 and 5, the fixing base 4 further includes a second limiting portion 44, where the second limiting portion 44 is fixedly connected to the second flow limiting cover 41 and is located on a side of the moving portion 63 facing the fixed portion 62, and one end surface of the second limiting portion 44 facing the moving portion 63 in the axial direction of the bypass channel 23 can abut against the moving portion 63 to limit excessive movement of the moving portion 63 in the direction of the fixed portion 62.

Specifically, the second limiting portion 44 in the present embodiment is disposed at an end of the adjustment channel 43 facing the fixing portion 62, and is fixedly connected to the second flow-limiting cover 41 through the adjustment channel 43, and the second limiting portion 44 extends radially outward from the outer peripheral wall of the adjustment channel 43. In other alternative embodiments, the second limiting portion 44 may also be directly provided on the inner peripheral wall of the second flow restricting cover 41.

As shown in fig. 3 and 5, the fixed portion 62 in this embodiment is disposed on a side of the moving portion 63 away from the adjusting rod 32, the first limiting portion 42 is provided with a second through hole 421 penetrating through the bypass channel 23 in the axial direction, the second through hole 421 is communicated with the adjusting channel 43, the adjusting rod 32 extends into the adjusting channel 43 through the through hole, the outer peripheral wall of the adjusting rod 32 abuts against the inner peripheral wall of the adjusting channel 43, where the abutment merely means that the gap between the outer peripheral wall of the adjusting rod 32 and the inner peripheral wall of the adjusting channel 43 is small, so as to prevent the flexible buffer 61 in the cavity 64 from flowing out from the gap therebetween, but no gap can be formed between the outer peripheral wall of the adjusting rod 32 and the inner peripheral wall of the adjusting channel 43, otherwise the smoothness of the sliding of the valve core 3 relative to the fixing seat 4 is affected. In addition, the adjusting channel 43 can also play a role in guiding movement of the adjusting rod 32, and prevent the adjusting rod 32 from shifting during movement.

As shown in fig. 5, the fixing base 4 further includes a third limiting portion 45, and the third limiting portion 45 self-adjusts an inner circumferential wall of the channel 43 to extend radially inward of the channel 43. The valve element 3 further includes a fourth stopper 33, the fourth stopper 33 extends radially outward of the adjustment lever 32 from an outer peripheral wall of the adjustment lever 32, the fourth stopper 33 is provided in the adjustment passage 43, and when the valve element 3 is in the second position, one end surface of the fourth stopper 33 away from the fixing portion 62 in the axial direction of the bypass passage 23 can abut against the third stopper 45. In this embodiment, the third limiting portion 45 and the fourth limiting portion 33 cooperate to prevent the adjusting rod 32 from moving out of the adjusting channel 43, so that on one hand, the non-newton fluid in the cavity 64 can be prevented from flowing out, and on the other hand, the cooperation relationship between the adjusting rod 32 and the adjusting channel 43 can be always maintained, so that interference between the two is avoided.

As shown in fig. 4 and 5, the second flow-limiting cover 41 is provided with a guide groove 91, the first flow-limiting cover 31 is provided with a guide block 92, the guide groove 91 extends along the axial direction of the bypass channel 23, and the guide block 92 is matched with the guide groove 91 and can slide along the extending direction of the guide groove 91 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 91 may be provided on the first flow restrictor 31, and the guide block 92 may be provided on the second flow restrictor 41.

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 cross section of the bypass channel 23, i.e. the sum of the cross sectional areas of all the first through holes 411 of the second restrictor 41, and the total maximum flow area of the flow holes 5 is the sum of the areas of all the 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 the maximum, the valve body 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 at the 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 normal water is gradually recovered, no more cold water is needed to be pumped into the water outlet channel 22, so as shown in fig. 6, the valve core 3 moves towards the water outlet channel 22 under the action of water flow, the adjusting rod 32 continuously presses the non-newtonian fluid in the cavity 64, and the structure of the non-newtonian fluid is changed to drive the moving part 63 to move towards the water inlet channel 21. The valve core 3 gradually reduces the opening of the overflow hole 5 in the moving process of the valve core 3 towards the water outlet channel 22 until the sum of the elastic force of the spring and the acting force of the non-Newtonian fluid on the valve core 3 and the acting force of the water flow brought to the valve core 3 are balanced, at the moment, the opening of the overflow hole 5 is minimum, the valve core 3 is positioned at the first position, the inflow 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 first restoring member 71 drives the valve body 3 to move toward the water intake passage 21, 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 (14)

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 connecting cavity and a first 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 between a first position and a second position relative to the fixed seat; when the valve core moves towards the first position, the opening degree of the overflow hole is reduced; when the valve core moves towards the second position, the opening degree of the overflow hole is increased;

the connecting chamber is fixed on the valve body and is positioned at one side of the valve core towards the first position, the connecting chamber is provided with a deformable cavity, a flexible buffer member is filled in the cavity, the valve core part stretches into the cavity to be abutted with the flexible buffer member, and when the valve core moves towards the first position, the valve core presses the flexible buffer member towards one side of the first position so as to deform the flexible buffer member and the cavity;

the first reset piece is connected with the valve core, and the first reset piece is used for applying acting force towards the second position direction to the valve core.

2. The bypass valve of claim 1, wherein the flexible damper is a non-newtonian fluid.

3. The bypass valve as recited in claim 2, wherein the connecting chamber includes a fixed portion and a moving portion, the fixed portion being fixed to the valve body, the moving portion being movable relative to the fixed portion, the fixed portion and the moving portion enclosing the cavity.

4. The bypass valve as recited in claim 3, wherein the spool includes a first restrictor cap and an adjustment rod provided on an inner peripheral side of the first restrictor cap and fixed to an axial end plate of the first restrictor cap;

the fixed seat is arranged on the inner peripheral side of the first flow-limiting cover, the fixed seat comprises a second flow-limiting cover, and the outer peripheral wall of the second flow-limiting cover is abutted with the inner peripheral wall of the first flow-limiting cover;

the connecting chamber is arranged on the inner peripheral side of the fixed seat, the fixed part is fixed on the inner peripheral wall of the second flow limiting cover, the moving part is arranged on one side of the fixed part in the axial direction of the bypass channel, the outer peripheral wall of the moving part is abutted with the inner peripheral wall of the second flow limiting cover, and the moving part can move along the axial direction of the bypass channel relative to the fixed part;

the fixing part, the moving part and the inner peripheral wall of the second flow limiting cover enclose a cavity, and the adjusting rod part extends into the cavity.

5. The bypass valve as recited in claim 4, further comprising a second restoring member, wherein the fixed seat further comprises a first limiting portion connected to the second restrictor and located on a side of the moving portion away from the fixed portion, wherein the second restoring member abuts against the moving portion and the first limiting portion at both ends of the bypass passage in an axial direction, respectively, and the second restoring member is configured to apply a force to the moving portion toward the fixed portion.

6. The bypass valve as recited in claim 5, wherein the fixed seat further includes a second limiting portion fixedly connected to the second restrictor and located on a side of the moving portion facing the fixed portion, and wherein the second limiting portion is capable of abutting against the moving portion in an axial direction of the bypass passage toward an end surface of the moving portion.

7. The bypass valve as recited in claim 5, wherein the fixed seat further comprises an adjustment channel extending along an axial direction of the bypass channel, the adjustment channel being connected to a side surface of the first limiting portion facing the moving portion, the moving portion being sleeved on the adjustment channel, an inner peripheral wall of the moving portion being in abutment with an outer peripheral wall of the adjustment channel;

the fixed part, the moving part, the inner peripheral wall of the second flow limiting cover and the inner peripheral wall of the adjusting channel enclose the cavity.

8. The bypass valve as claimed in claim 7, wherein the fixed portion is provided at a side of the moving portion away from the adjustment lever, the first limiting portion is provided with a through hole penetrating in an axial direction of the bypass passage, the through hole is communicated with the adjustment passage, and the adjustment lever extends into the adjustment passage through the through hole.

9. The bypass valve as recited in claim 8, wherein the holder further includes a third stopper extending radially inward of the adjustment passage from an inner peripheral wall of the adjustment passage;

the valve core further comprises a fourth limiting part, the fourth limiting part extends from the outer circumferential wall of the adjusting rod to the radial outer side of the adjusting rod, the fourth limiting part is arranged in the adjusting channel, and one end face, far away from the fixing part, of the fourth limiting part in the axis direction of the bypass channel can be abutted to the third limiting part.

10. The bypass valve as recited in claim 8, wherein both ends of the first return member in the axial direction of the bypass passage are respectively abutted against the first stopper and an axial end plate of the first restrictor.

11. 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.

12. 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.

13. The bypass valve as claimed in any one of claims 1 to 12, wherein the valve spool is provided at a side of the bypass passage adjacent to the water inlet passage, the fixed seat is provided at a side of the bypass passage adjacent to the water outlet passage, and the valve spool is provided so as to be movable in a direction of the water outlet passage by a water flow;

when the valve core moves towards the direction of the water outlet channel, the opening of the overflow hole is reduced; when the valve core moves towards the water inlet channel, the opening degree of the overflow hole is increased.

14. A water heater comprising a bypass valve as claimed in any one of claims 1 to 13.

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