Antifreeze-cracking valve body and gas water heater including the same

Abstract

The present invention discloses an anti-freezing crack valve body and a gas water heater including the same. The anti-freezing crack valve body includes a first pipe fitting, a second pipe fitting, and a driving mechanism. The second pipe fitting is communicated with the first pipe fitting. The driving mechanism has a first state and a second state. During the process of the temperature dropping from a first temperature to a second temperature, the driving mechanism switches from the first state to the second state, so that the first pipe fitting and the second pipe fitting can move relatively away from each other under an external force, so as to realize that the space of the water flow channel between the first pipe fitting and the second pipe fitting becomes larger. In the anti-freezing crack valve body of the present invention, when the power is off and the water supply is continuous, when the temperature drops, the driving mechanism makes the first pipe fitting and the second pipe fitting move relatively away from each other, so that the space of the water flow channel between the first pipe fitting and the second pipe fitting becomes larger. Once the water freezes, the increased volume after the water freezes can be released, preventing the entire water flow channel from being cracked or frozen, and avoiding property losses such as the whole machine leaking water, the floor being soaked with water, and electrical leakage, as well as situations endangering safety.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number 202210458463.7 and the filing date of April 27, 2022. Technical Field

[0002] The present invention relates to an anti-freezing and cracking valve body and a gas water heater including the same. Background Art

[0003] In winter, when cold air comes, the temperature drops rapidly. The water in the water circuit of the gas water heater freezes due to the low temperature, and the ice expands outward, which is extremely easy to damage the pipeline, resulting in the cracking of the gas water heater. Currently, the gas water heaters on the market mainly use anti-freezing heating blocks for anti-freezing. The anti-freezing heating blocks can only work when powered on. In the case of power failure, gas cut-off, and continuous water supply, the anti-freezing heating blocks cannot play an effective role, which will cause the pipeline in the gas water heater to freeze and crack. If the water inlet valve is not found and closed in time, it will cause the whole machine to leak water, resulting in property losses such as floor flooding and electrical leakage and safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the pipeline in the gas water heater is extremely easy to freeze and crack in the case of power failure in the prior art, and provide an anti-freezing and cracking valve body and a gas water heater including the same.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides an anti-freezing and cracking valve body, which includes:

[0007] A first pipe fitting;

[0008] A second pipe fitting communicated with the first pipe fitting;

[0009] A driving mechanism having a first state and a second state. During the process of the temperature dropping from a first temperature to a second temperature, the driving mechanism switches from the first state to the second state, so that the first pipe fitting and the second pipe fitting can move relatively away from each other under an external force, so as to increase the space of the water flow channel between the first pipe fitting and the second pipe fitting.

[0010] In this solution, adopting the above structural form, in the case of power failure and continuous water supply, when the water temperature drops to the second temperature, the driving mechanism makes the first pipe fitting and the second pipe fitting move relatively away from each other, so that the space of the water flow channel between the first pipe fitting and the second pipe fitting becomes larger. Once the water freezes, the increased volume after the water freezes is released, thereby preventing the entire water flow channel from being cracked or frozen, and further reducing or avoiding property losses such as the whole machine leaking water, floor flooding, and electrical leakage and safety hazards.

[0011] Preferably, the driving mechanism includes a clamping member connected to the first pipe fitting. When the driving mechanism is in the first state, the clamping member is clamped with the second pipe fitting to relatively fix the second pipe fitting and the first pipe fitting; when the driving mechanism is in the second state, the clamping member is disengaged from the second pipe fitting to relatively move the second pipe fitting and the first pipe fitting away from or close to each other.

[0012] In this solution, adopting the above structural form, the relative fixation and separation between the second pipe fitting and the first pipe fitting are realized through the cooperation between the clamping member and the second pipe fitting, which is convenient for controlling the relative position between the first pipe fitting and the second pipe fitting.

[0013] Preferably, the clamping member is arranged inside the second pipe fitting.

[0014] In this solution, adopting the above structural form, the spatial layout is reasonable, making the anti-freezing crack valve body structure compact.

[0015] Preferably, a diaphragm is installed at one end of the first pipe fitting away from the second pipe fitting, and the clamping member is connected to the diaphragm through a connecting rod.

[0016] In this solution, adopting the above structural form, when water is introduced into the water flow channel, due to the action of water pressure, the diaphragm will form a tensile force in the direction away from the second pipe fitting, thereby limiting the clamping member to prevent the clamping member from shaking, strengthening the clamping effect between the clamping member and the second pipe fitting, and preventing the clamping member from disengaging from the second pipe fitting.

[0017] Preferably, the anti-freezing crack valve body includes a reset member. During the process of rising from the second temperature to the first temperature, the reset member makes the first pipe fitting and the second pipe fitting approach each other and return to the initial relative position.

[0018] In this solution, adopting the above structural form, during the process of rising from the second temperature to the first temperature, the reset member makes the volume of the movable channel between the first pipe fitting and the second pipe fitting become smaller and return to the initial state to achieve automatic reset.

[0019] Preferably, the reset member includes a first telescopic driving member. The first telescopic driving member is arranged inside the second pipe fitting, and both ends of the first telescopic driving member respectively abut against the clamping member and the second pipe fitting. During the process of rising from the second temperature to the first temperature, the first telescopic driving member realizes the relative movement between the first pipe fitting and the second pipe fitting through extension.

[0020] In this solution, adopting the above structural form, the first telescopic driving member realizes the relative movement between the first pipe fitting and the second pipe fitting by stretching, so that the first pipe fitting and the second pipe fitting return to the initial relative position to achieve reset.

[0021] Preferably, the first telescopic driving member is a first shape memory alloy elastic member.

[0022] In this solution, adopting the above structural form, without electric drive, using a mechanical structure, it realizes that the water flow channel between the first pipe fitting and the second pipe fitting can be adjusted according to the change of temperature, with good reliability, and can play an effective protection when power is off.

[0023] Preferably, the clamping member includes a sleeve and a clamping rod. The clamping rod is placed inside the sleeve. A through hole is formed on the side wall of the sleeve, and the clamping rod can pass through the through hole and be clamped with the second pipe fitting.

[0024] In this solution, adopting the above structural form, the clamping rod is placed inside the sleeve, reducing the erosion of the water flow on the clamping rod, thereby reducing the wear of the clamping rod and prolonging the service life of the clamping rod. The through hole provided on the sleeve enables the clamping rod to be clamped with the second pipe fitting.

[0025] Preferably, the clamping member further includes a second telescopic driving member connected to the clamping rod. During the switching between the first temperature and the second temperature, the second telescopic driving member drives the clamping rod to move along the through hole by stretching.

[0026] In this solution, adopting the above structural form, the second telescopic driving member changes its telescopic amount according to the change of temperature, so as to drive the clamping rod to move away from or close to the second pipe fitting, thereby controlling the clamping relationship between the clamping rod and the second pipe fitting, which is convenient for automatic control and easy to manage.

[0027] Preferably, the clamping rod includes a first rod and a second rod that are cross-fixed. The second telescopic driving member is sleeved on the outer peripheral side of the first rod, and both ends of the second telescopic driving member respectively abut against the second rod and the inner wall of the sleeve to drive the first rod to move along its extending direction.

[0028] In this solution, adopting the above structural form, since the first rod and the second rod are cross-fixed, during the process of the second telescopic driving member stretching and pushing the second rod to move, it can push the first rod to move away from or close to the inner wall of the sleeve that abuts against the second telescopic driving member in the sleeve, thereby realizing the cooperation between the clamping rod and the second pipe fitting. The spatial layout is reasonable and compact, and the structure is simple and easy to process.

[0029] Preferably, the second telescopic driving member is a second shape memory alloy elastic member.

[0030] In this solution, adopting the above structural form, during the process of decreasing from the first temperature to the second temperature, the second shape memory alloy elastic member contracts, driving the first rod to move away from the second pipe fitting; when rising from the second temperature to the first temperature, the second shape memory alloy elastic member elongates, pushing the first rod to move towards the second pipe fitting. Without electric drive and adopting a mechanical structure, the clamping and release of the clamping relationship between the clamping member and the second pipe fitting are realized, with good reliability. When powered off, it can provide effective protection.

[0031] Preferably, a groove is formed in the inner wall of the second pipe fitting to cooperate with the clamping member for clamping.

[0032] In this solution, adopting the above structural form is convenient for processing, and the clamping relationship is formed through the cooperation between the clamping member and the groove, with a stable clamping effect.

[0033] Preferably, a part of the second pipe fitting is placed inside the first pipe fitting. The side wall of the first pipe fitting is provided with a water inlet, and the water inlet is located in the non-overlapping area between the first pipe fitting and the second pipe fitting. A sealing ring is provided between the inner wall of the first pipe fitting and the outer wall of the second pipe fitting.

[0034] In this solution, adopting the above structural form can prevent water flow from flowing out through the gap between the inner wall of the first pipe fitting and the outer wall of the second pipe fitting, making the anti-freezing and cracking valve body have good sealing performance.

[0035] The present invention also provides a gas water heater, and the gas water heater includes the anti-freezing and cracking valve body as described above.

[0036] Preferably, the anti-freezing and cracking valve body is connected to the water inlet pipeline. An outlet is formed at one end of the second pipe fitting far from the first pipe fitting, and a movable connecting pipe is installed between the outlet and the water inlet pipeline.

[0037] In this solution, adopting the above structural form, since the second pipe fitting can move away from or towards the first pipe fitting, the second pipe fitting is movably arranged, and one end of the second pipe fitting far from the first pipe fitting is connected to the water inlet pipeline through a movable connecting pipe, reducing or avoiding the phenomenon that the water inlet pipeline needs to move along with the movement of the second pipe fitting, resulting in damage, and there is no need to consider reserving a larger assembly space for the water inlet pipeline when it needs to move, with a compact structure.

[0038] The positive and progressive effects of the present invention are as follows:

[0039] In the anti-freezing crack valve body of the present invention, when the power is off but the water supply continues, when the water temperature drops to the second temperature, the driving mechanism makes the first pipe fitting and the second pipe fitting move relatively away from each other, so that the water flow channel space between the first pipe fitting and the second pipe fitting becomes larger. Once the water freezes, the increased volume after the water freezes can be released, thereby preventing the entire water flow channel from being burst or frozen, and further reducing or avoiding property losses such as the whole machine leaking water, the floor being flooded, and electrical leakage, as well as situations endangering safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of the driving mechanism in the first state in the anti-freezing crack valve body of the preferred embodiment of the present invention.

[0041] Figure 2 is Figure 1 the enlarged view of part A in

[0042] Figure 3 It is a schematic structural diagram of the driving mechanism in the second state in the anti-freezing crack valve body of the preferred embodiment of the invention.

[0043] Figure 4 is Figure 3 the enlarged view of part B in

[0044] Figure 5 It is a schematic installation diagram of the anti-freezing crack valve body of the preferred embodiment of the present invention in a gas water heater.

[0045] DESCRIPTION OF THE REFERENCE NUMERALS:

[0046] The first pipe fitting 1

[0047] Diaphragm 11

[0048] Connecting rod 12

[0049] Water inlet 13

[0050] The second pipe fitting 2

[0051] Groove 21

[0052] Water outlet 22

[0053] Driving mechanism 3

[0054] Snap fitting 31

[0055] Sleeve 311

[0056] Through hole 3111

[0057] Snap rod 312

[0058] The first rod 3121

[0059] The second rod 3122

[0060] The second telescopic driving member 313

[0061] The reset member 4

[0062] The first telescopic driving member 41

[0063] The sealing ring 5

[0064] The water inlet pipeline 6

[0065] The movable connecting pipe 7 Specific implementation manners

[0066] The present invention will be further described below by way of embodiments, but the present invention is not limited to the following scope of embodiments for this reason.

[0067] An embodiment of the present invention provides an anti-freezing and cracking valve body. Please refer to Figures 1 to 5 at the same time. The anti-freezing and cracking valve body includes a first pipe fitting 1, a second pipe fitting 2 and a driving mechanism 3. The first pipe fitting 1 and the second pipe fitting 2 are communicated. The driving mechanism 3 has a first state and a second state. During the process of the water temperature dropping from a first temperature to a second temperature, the driving mechanism 3 switches from the first state to the second state, so that the first pipe fitting 1 and the second pipe fitting 2 can move relatively away from each other under an external force, so as to increase the space of the water flow channel between the first pipe fitting 1 and the second pipe fitting 2. Among them, the first temperature is that the water temperature is above 0 degrees Celsius, and the second temperature is that the water temperature is below 0 degrees Celsius. At this time, the temperature is at the first temperature, the driving mechanism 3 is in the first state, and the relative positions of the first pipe fitting 1 and the second pipe fitting 2 are as Figure 1 shown; when the temperature drops from the first temperature to the second temperature, the driving mechanism 3 switches to the second state, and the relative positions of the first pipe fitting 1 and the second pipe fitting 2 are as Figure 3 shown. It can be seen that during the process of the first temperature dropping to the second temperature, the second pipe fitting 2 moves away from the first pipe fitting 1, so that the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 forms a movable channel, and the space of the movable channel increases.

[0068] In this embodiment, when the power is off but the water supply is not cut off, when the water temperature drops to the second temperature, the driving mechanism 3 makes the first pipe fitting 1 and the second pipe fitting 2 move relatively away from each other, so that the space of the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 increases. Once the water freezes, the increased volume after the water freezes is released, thereby preventing the entire water flow channel from being cracked or frozen, and further reducing or avoiding property losses such as the whole machine leaking water, the floor being soaked with water, and electrical leakage, and situations endangering safety.

[0069] The driving mechanism 3 includes a clamping member 31 connected to the first pipe fitting 1. When the driving mechanism 3 is in the first state, the clamping member 31 is clamped with the second pipe fitting 2 so that the second pipe fitting 2 and the first pipe fitting 1 are relatively fixed; when the driving mechanism 3 is in the second state, the clamping member 31 is disengaged from the second pipe fitting 2 so that the second pipe fitting 2 and the first pipe fitting 1 are relatively far away or close to each other. The relative fixation and separation between the second pipe fitting 2 and the first pipe fitting 1 are realized through the cooperation between the clamping member 31 and the second pipe fitting 2, which is convenient for controlling the relative position between the first pipe fitting 1 and the second pipe fitting 2.

[0070] In this embodiment, the clamping member 31 is arranged inside the second pipe fitting 2, and the spatial layout is reasonable, making the anti-freezing and cracking valve body structure compact. A diaphragm 11 is installed at one end of the first pipe fitting 1 far away from the second pipe fitting 2, and the clamping member 31 is connected to the diaphragm 11 through a connecting rod 12. When water is introduced into the water flow channel, due to the action of water pressure, the diaphragm 11 will form a tensile force in the direction away from the second pipe fitting 2, thereby limiting the clamping member 31 to prevent the clamping member 31 from shaking, so as to strengthen the clamping effect between the clamping member 31 and the second pipe fitting 2 and prevent the clamping member 31 from disengaging from the second pipe fitting 2.

[0071] In this embodiment, the anti-freezing and cracking valve body includes a reset member 4. During the process of rising from the second temperature to the first temperature, the reset member 4 makes the first pipe fitting 1 and the second pipe fitting 2 approach each other and return to the initial relative position. During the process of rising from the second temperature to the first temperature, the reset member 4 makes the volume of the movable channel between the first pipe fitting 1 and the second pipe fitting 2 become smaller and return to the initial state to achieve automatic reset.

[0072] In other embodiments, the anti-freezing and cracking valve body includes a first pipe fitting 1, a second pipe fitting 2, a driving mechanism 3 and a reset member 4. The first pipe fitting 1 and the second pipe fitting 2 are communicated. The driving mechanism 3 has a first state and a second state. During the process of dropping from the first temperature to the second temperature, the driving mechanism 3 switches from the first state to the second state, so that the first pipe fitting 1 and the second pipe fitting 2 can be relatively far away from each other under the action of an external force, so as to realize the increase in the space of the water flow channel between the first pipe fitting 1 and the second pipe fitting 2; during the process of rising from the second temperature to the first temperature, the reset member 4 makes the first pipe fitting 1 and the second pipe fitting 2 approach each other and return to the initial relative position.

[0073] The reset member 4 includes a first telescopic driving member 41. The first telescopic driving member 41 is arranged inside the second pipe fitting 2. The two ends of the first telescopic driving member 41 respectively abut against the clamping member 31 and the second pipe fitting 2. During the process of rising from the second temperature to the first temperature, the first telescopic driving member 41 realizes the relative movement between the first pipe fitting 1 and the second pipe fitting 2 by stretching, so that the first pipe fitting 1 and the second pipe fitting 2 return to the initial relative position to achieve reset. The first telescopic driving member 41 is sleeved on the outer peripheral side of the connecting rod 12, and one end of the first telescopic driving member 41 abuts against the clamping member 31 connected to the first pipe fitting 1, and the other end abuts against the second pipe fitting 2.

[0074] The first telescopic driving member 41 is a first shape memory alloy elastic member. The first shape memory alloy elastic member changes its own telescopic amount with the change of temperature. When the temperature rises, the elasticity becomes larger and the first shape memory alloy elastic member elongates; when the temperature drops, the elasticity becomes smaller and the first shape memory alloy elastic member contracts. During the process of dropping from the first temperature to the second temperature, the clamping connection between the clamping member 31 and the second pipe fitting 2 is released. When water freezes, its volume increases and pushes the first pipe fitting 1 and the second pipe fitting 2 to move relatively away, reserving space for the water after it freezes in the movable water flow channel, so that the space after the water freezes is released. At this time, the first shape memory alloy elastic member contracts and does not interfere with the relative movement between the first pipe fitting 1 and the second pipe fitting 2; when rising from the second temperature to the first temperature, the first shape memory alloy elastic member elongates, so that the first pipe fitting 1 and the second pipe fitting 2 approach each other and return to the initial relative position to achieve reset. The anti-freezing and cracking valve body of this embodiment does not need to be driven by electricity, adopts a mechanical structure, realizes that the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 can be adjusted according to the change of temperature, has good reliability, and can play an effective protection when power is off. Preferably, the first telescopic driving member 41 is a shape memory alloy spring, which is convenient to process and has good telescopic performance.

[0075] As Figure 2 and Figure 4 shown, in this embodiment, the clamping member 31 includes a sleeve 311 and a clamping rod 312. The clamping rod 312 is placed inside the sleeve 311. A through hole 3111 is opened on the side wall of the sleeve 311. The clamping rod 312 can pass through the through hole 3111 and be clamped with the second pipe fitting 2. The clamping rod 312 is placed inside the sleeve 311, reducing the erosion of the water flow on the clamping rod 312, thereby reducing the wear of the clamping rod 312 and prolonging the service life of the clamping rod 312. The through hole 3111 provided on the sleeve 311 enables the clamping rod 312 to be clamped with the second pipe fitting 2.

[0076] The snap - connecting part 31 further includes a second telescopic driving part 313 connected to the snap - connecting rod 312. During the process of switching between the first temperature and the second temperature, the second telescopic driving part 313 drives the snap - connecting rod 312 to move along the through - hole 3111 through telescoping. During the process of decreasing from the first temperature to the second temperature, affected by the temperature, the telescopic amount of the second telescopic driving part 313 changes, driving the snap - connecting rod 312 connected to it to pass through the through - hole 3111 and extend out of the sleeve 311 to achieve snap - connection with the second pipe fitting 2, thereby realizing the relative fixation between the first pipe fitting 1 and the second pipe fitting 2. During the process of increasing from the second temperature to the first temperature, affected by the temperature, the telescopic amount of the second telescopic driving part 313 changes, driving the snap - connecting rod 312 connected to it to move away from the second pipe fitting 2, enabling the second pipe fitting 2 and the snap - connecting part 31 to move relatively, that is, the second pipe fitting 2 and the first pipe fitting 1 can move relatively. The second telescopic driving part 313 changes its telescopic amount according to the temperature change to drive the snap - connecting rod 312 to move in the direction away from or close to the second pipe fitting 2, thereby controlling the snap - connection relationship between the snap - connecting rod 312 and the second pipe fitting 2, which is convenient for automatic control and easy to manage.

[0077] The snap - connecting rod 312 includes a first rod 3121 and a second rod 3122 that are cross - fixed. The second telescopic driving part 313 is sleeved on the outer peripheral side of the first rod 3121, and both ends of the second telescopic driving part 313 respectively abut against the second rod 3122 and the inner wall of the sleeve 311 to drive the first rod 3121 to move along its extending direction. Since the first rod 3121 and the second rod 3122 are cross - fixed, during the process of the second telescopic driving part 313 telescoping and pushing the second rod 3122 to move, it can push the first rod 3121 to move in the direction away from or close to the inner wall of the sleeve 311 that abuts against the second telescopic driving part 313, thereby realizing the cooperation between the snap - connecting rod 312 and the second pipe fitting 2. The spatial layout is reasonable and compact, and the structure is simple, which is convenient for processing.

[0078] Specifically, the first rod 3121 and the second rod 3122 are arranged perpendicular to each other, and the length direction of the first rod 3121 and the axis direction of the through - hole 3111 are on the same straight line, and the possibility of the first rod 3121 being blocked when passing through the through - hole 3111 is relatively small.

[0079] The second telescopic driving member 313 is a second shape memory alloy elastic member. During the process of cooling from the first temperature to the second temperature, the second shape memory alloy elastic member contracts, driving the first rod 3121 to move away from the second pipe fitting 2; during the process of heating from the second temperature to the first temperature, the second shape memory alloy elastic member elongates, pushing the first rod 3121 to move closer to the second pipe fitting 2. Without the need for electric drive, a mechanical structure is adopted to achieve the clamping and release of the clamping relationship between the clamping member 31 and the second pipe fitting 2, with good reliability. When powered off, it can provide effective protection. Preferably, the second telescopic driving member 313 is a shape memory alloy spring, which is convenient to process and has good telescopic performance. The first shape memory alloy elastic member and the second shape memory alloy elastic member can be made of the same material.

[0080] A groove 21 is formed in the inner wall of the second pipe fitting 2 to cooperate with the clamping member 31 for clamping, which is convenient for processing, and a clamping relationship is formed through the cooperation between the clamping member 31 and the groove 21, and the clamping effect is stable.

[0081] Part of the second pipe fitting 2 is placed inside the first pipe fitting 1. A water inlet 13 is provided on the side wall of the first pipe fitting 1, and the water inlet 13 is located in the non-overlapping area between the first pipe fitting 1 and the second pipe fitting 2. A sealing ring 5 is provided between the inner wall of the first pipe fitting 1 and the outer wall of the second pipe fitting 2. The setting of the sealing ring 5 prevents water from flowing out through the gap between the inner wall of the first pipe fitting 1 and the outer wall of the second pipe fitting 2, making the anti-freezing and cracking valve body have good sealing performance.

[0082] In specific use, under the condition of continuous power supply and during normal use, the driving mechanism 3 is in the first state, and the clamping member 31 is clamped with the second pipe fitting 2. Due to the action of water pressure, the diaphragm 11 at the end of the first pipe fitting 1 will form an outward pulling force, which limits the clamping member 31 and the second pipe fitting 2, so that the second pipe fitting 2 will not move relative to the first pipe fitting 1. When the temperature decreases, the elastic forces of the first shape memory alloy elastic member and the second shape memory alloy elastic member gradually become smaller. When the temperature drops to the second temperature, that is, when the water temperature drops below 0 °C, the second shape memory alloy elastic member compresses, causing the clamping rod 312 to move away from the second pipe fitting 2 and release the clamping relationship with the second pipe fitting 2. The volume increase during the water freezing process can push the second pipe fitting 2 away from the first pipe fitting 1 in the direction away from it, reserving space for the frozen water in the movable water flow channel, so that the space after the water freezes is released. At this time, the first shape memory alloy elastic member shrinks and does not interfere with the relative movement of the first pipe fitting 1 and the second pipe fitting 2. When the temperature rises, the elastic forces of the first shape memory alloy elastic member and the second shape memory alloy elastic member gradually become larger. The first shape memory alloy elastic member elongates, causing the second pipe fitting 2 to gradually approach the first pipe fitting 1 and return to the initial relative position. At the same time, the second shape memory alloy elastic member gradually elongates and pushes the clamping rod 312 into the groove 21 of the second pipe fitting 2, realizing the fixation of the first pipe fitting 1 relative to the second pipe fitting 2, automatically resetting and returning to the initial state to prepare for the next use. This solution uses a pure mechanical mechanism, which can provide effective protection when the power is off.

[0083] In other embodiments, when the temperature drops to the second temperature, the water freezing process can also push the first pipe fitting 1 away from the second pipe fitting 2 in the direction away from it. When the temperature rises, the elastic forces of the first shape memory alloy elastic member and the second shape memory alloy elastic member gradually become larger. The first shape memory alloy elastic member elongates, causing the first pipe fitting 1 to gradually approach the second pipe fitting 2 and return to the initial relative position.

[0084] The embodiment of the present invention also provides a gas water heater, as Figure 5 shown, the gas water heater includes an anti-freezing crack valve body as described in any one of the above embodiments.

[0085] In this embodiment, the anti-freezing crack valve body is connected to the water inlet pipeline 6. An outlet 22 is provided at one end of the second pipe fitting 2 far from the first pipe fitting 1. A movable connecting pipe 7 is installed between the outlet 22 and the water inlet pipeline 6. An inlet 13 is provided on the side wall of one end of the first pipe fitting 1 far from the second pipe fitting 2. Water flows into the movable channel between the first pipe fitting 1 and the second pipe fitting 2 through the inlet 13, and then flows out of the anti-freezing crack valve body through the outlet 22 to enter the water inlet pipeline 6. Since the second pipe fitting 2 can move in a direction away from or close to the first pipe fitting 1, the second pipe fitting 2 is movably arranged. One end of the second pipe fitting 2 far from the first pipe fitting 1 is connected to the water inlet pipeline 6 through the movable connecting pipe 7, reducing or avoiding the phenomenon that the water inlet pipeline 6 needs to move along with the movement of the second pipe fitting 2, thereby causing damage. There is also no need to consider reserving a larger assembly space for the water inlet pipeline 6 in the case where its movement is required, and the structure is compact.

[0086] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An anti-cracking valve body, characterized in that, The anti-freezing and cracking valve body includes: A first pipe fitting; A second pipe fitting, which is communicated with the first pipe fitting; A driving mechanism, which has a first state and a second state. During the process of the temperature dropping from the first temperature to the second temperature, the driving mechanism switches from the first state to the second state, so that the first pipe fitting and the second pipe fitting can move relatively away from each other under the action of an external force, so as to realize the increase of the space of the water flow channel between the first pipe fitting and the second pipe fitting; The driving mechanism includes a clamping member connected to the first pipe fitting. When the driving mechanism is in the first state, the clamping member is clamped with the second pipe fitting, so that the second pipe fitting and the first pipe fitting are relatively fixed; when the driving mechanism is in the second state, the clamping member is disengaged from the second pipe fitting, so that the second pipe fitting and the first pipe fitting move relatively away from or close to each other; The clamping member is arranged in the second pipe fitting; The anti-freezing and cracking valve body includes a reset member. During the process of the temperature rising from the second temperature to the first temperature, the reset member makes the first pipe fitting and the second pipe fitting approach each other and return to the initial relative position; The reset member includes a first telescopic driving member, which is arranged in the second pipe fitting. The two ends of the first telescopic driving member respectively abut against the clamping member and the second pipe fitting. During the process of the temperature rising from the second temperature to the first temperature, the first telescopic driving member realizes the relative movement of the first pipe fitting and the second pipe fitting by stretching.

2. The anti-cracking valve body according to claim 1, wherein The first telescopic driving member is a first shape memory alloy elastic member.

3. The anti-cracking valve body according to claim 1, wherein, The clamping member includes a sleeve and a clamping rod. The clamping rod is placed in the sleeve. A through hole is opened on the side wall of the sleeve, and the clamping rod can pass through the through hole and be clamped with the second pipe fitting.

4. The anti-cracking valve body according to claim 3, characterized in that, The clamping member further includes a second telescopic driving member connected to the clamping rod. During the process of switching between the first temperature and the second temperature, the second telescopic driving member drives the clamping rod to move along the through hole by stretching and contracting.

5. The anti-cracking valve body according to claim 4, characterized in that, The clamping rod includes a first rod member and a second rod member which are cross-fixed. The second telescopic driving member is sleeved on the outer peripheral side of the first rod member, and the two ends of the second telescopic driving member respectively abut against the second rod member and the inner wall of the sleeve, so as to drive the first rod member to move along its extending direction.

6. The anti-cracking valve body according to claim 4, characterized in that, The second telescopic driving member is a second shape memory alloy elastic member.

7. The anti-cracking valve body according to claim 1, characterized in that, A groove is opened on the inner wall of the second pipe fitting to cooperate with the clamping member for clamping.

8. The anti-cracking valve body according to claim 1, characterized in that, A part of the second pipe fitting is placed in the first pipe fitting. An inlet is arranged on the side wall of the first pipe fitting, and the inlet is located in the non-overlapping area between the first pipe fitting and the second pipe fitting. A sealing ring is arranged between the inner wall of the first pipe fitting and the outer wall of the second pipe fitting.

9. A gas water heater, characterized in that, The gas water heater includes the anti-freezing and cracking valve body according to any one of claims 1-8.

10. The gas water heater according to claim 9, characterized in that, The anti-freezing and cracking valve body is connected to the water inlet pipeline. An outlet is opened at one end of the second pipe fitting far away from the first pipe fitting, and a movable connecting pipe is installed between the outlet and the water inlet pipeline.

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