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 and a second pipe fitting. The outer wall of the first pipe fitting has a clamping portion, and the side wall of the second pipe fitting has a clamping member. The clamping member has a first state and a second state. When the clamping member is in the first state, the clamping member can be clamped with the clamping portion. When the clamping member is in the second state, the clamping member can be disengaged from the clamping portion. During the process of the temperature dropping from the first temperature to the second temperature, the clamping member switches from the first state to the second state, and 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. In the anti-freezing crack valve body of the present invention, in the case of severe cold in winter, when the water temperature drops to the second temperature, the volume of the water increases during the ice formation process, pushing the first pipe fitting and the second pipe fitting to move relatively away from each other, and the space of the water flow channel increases, preventing the entire water flow channel from being cracked or frozen.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number 202210458427.0 and the filing date of April 27, 2022. Technical Field

[0002] The present invention relates to an anti-freezing crack 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. The ice expands outward, which is extremely easy to damage the pipeline, resulting in the cracking of the gas water heater. If the water inlet valve is not discovered 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 problems. 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 severe winter in the prior art, and provide an anti-freezing crack 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 crack valve body, which includes:

[0007] A first pipe fitting, the outer wall of the first pipe fitting has a clamping portion;

[0008] A second pipe fitting, at least a part of the first pipe fitting is placed in the second pipe fitting and is communicated with the second pipe fitting, and the side wall of the second pipe fitting has a clamping member;

[0009] The clamping member has a first state and a second state. When the clamping member is in the first state, the clamping member can be clamped with the clamping portion to make the first pipe fitting and the second pipe fitting relatively fixed; when the clamping member is in the second state, the clamping member can be disengaged from the clamping portion to make the first pipe fitting and the second pipe fitting relatively movable;

[0010] During the process of the temperature dropping from the first temperature to the second temperature, the clamping member switches from the first state to the second state, the clamping portion and the clamping member are disengaged from the clamping relationship, and the first pipe fitting and the second pipe fitting can be relatively far away from each other under the action of an external force to realize that the space of the water flow channel between the first pipe fitting and the second pipe fitting becomes larger.

[0011] In this solution, adopting the above structural form, in the case of severe cold in winter, when the water temperature drops to the second temperature, the clamping part and the clamping piece are disengaged from the clamping relationship, enabling the first pipe fitting and the second pipe fitting to move relative to each other. Once the water freezes, the volume increases during the freezing process, pushing the first pipe fitting and the second pipe fitting to move away from each other relatively. The increased volume after the water freezes is released, and the space of the water flow channel between the first pipe fitting and the second pipe fitting becomes larger, thus 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, and electrical leakage, as well as situations endangering safety.

[0012] Preferably, a through hole is formed in the side wall of the second pipe fitting and a sleeve is connected thereto. The clamping piece is placed inside the sleeve, and the clamping piece can pass through the through hole and be clamped with the clamping part.

[0013] In this solution, adopting the above structural form, the clamping piece is placed inside the sleeve, reducing the erosion of the water flow on the clamping piece, thereby reducing the wear of the clamping piece and prolonging the service life of the clamping piece. The through hole provided on the sleeve enables the clamping piece to be clamped with the first pipe fitting.

[0014] Preferably, the clamping piece includes a clamping rod and a first telescopic driving member. During the process of switching between the first temperature and the second temperature, the first telescopic driving member drives the clamping rod to move along the through hole through telescoping.

[0015] In this solution, adopting the above structural form, the first telescopic driving member changes its telescopic amount according to the temperature change, so as to drive the clamping rod to move in a direction away from or close to the clamping part, thereby controlling the clamping relationship between the clamping rod and the clamping part, which is convenient for automatic control and easy to manage.

[0016] Preferably, the clamping rod includes a first rod member and a second rod member that are cross-fixed. The first telescopic driving member is sleeved on the outer peripheral side of the first rod member, and one end of the first telescopic driving member abuts against the end face of the second rod member that is away from the first pipe fitting, and the other end of the first telescopic driving member abuts against the inner wall of the sleeve to drive the first rod member to move along its extending direction.

[0017] In this solution, adopting the above structural form, since the first rod member and the second rod member are cross-fixed, during the process of the first telescopic driving member telescoping and pushing the second rod member to move, the first rod member moves in a direction away from or close to the inner wall of the sleeve that abuts against the first telescopic driving member, thereby realizing the cooperation between the clamping rod and the clamping part. The space layout is reasonable and compact, and the structure is simple and convenient for processing.

[0018] Preferably, the first telescopic driving member is a first shape memory alloy elastic member.

[0019] In this solution, adopting the above structural form, during the process of the temperature decreasing from the first temperature to the second temperature, the first shape memory alloy elastic member contracts, driving the first rod to move away from the clamping portion; during the process of the temperature rising from the second temperature to the first temperature, the first shape memory alloy elastic member elongates, pushing the first rod to move towards the clamping portion. Without electric drive and adopting a mechanical structure, the clamping and unclamping relationship between the clamping member and the clamping portion is realized, with good reliability, and it can provide effective protection when power is off.

[0020] Preferably, the second rod is connected to the middle of the first rod, and the clamping member further includes a spring sleeved on the outer peripheral side of the first rod. One end of the spring abuts against the end face of the second rod close to the first pipe fitting, and the other end of the spring abuts against the outer wall of the second pipe fitting.

[0021] In this solution, adopting the above structural form, a spring is provided to limit the distance that the first rod extends out of the through hole, preventing the first rod from extending too long and damaging the first pipe fitting.

[0022] Preferably, a groove is formed on the outer wall of the first pipe fitting to form the clamping portion, and the groove cooperates with the clamping rod for clamping.

[0023] In this solution, adopting the above structural form, a groove is opened on the outer wall of the first pipe fitting, which is convenient for processing, and a clamping relationship is formed through the cooperation between the clamping rod and the groove, with a stable clamping effect.

[0024] Preferably, the anti-freezing crack 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.

[0025] In this solution, adopting the above structural form, during the process of the temperature 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.

[0026] Preferably, the reset member includes a second retractable driving member. The two ends of the second retractable driving member respectively abut against the first pipe fitting and the second pipe fitting. During the process of the temperature rising from the second temperature to the first temperature, the second retractable driving member realizes the relative movement of the first pipe fitting and the second pipe fitting by stretching.

[0027] In this solution, adopting the above structural form, according to the change of temperature, the second retractable driving member realizes the relative movement of the first pipe fitting and the second pipe fitting by stretching, making the first pipe fitting and the second pipe fitting return to the initial relative position to achieve automatic reset.

[0028] Preferably, the second telescopic driving member is sleeved on the outer peripheral side of the first pipe fitting and placed between the first pipe fitting and the second pipe fitting. The outer wall of the first pipe fitting has a first protruding portion, and the inner wall of the second pipe fitting has a second protruding portion. Two ends of the second telescopic driving member respectively abut against the first protruding portion and the second protruding portion.

[0029] In this solution, adopting the above structural form, the second telescopic driving member is sleeved on the outer peripheral side of the first pipe fitting, which is convenient for installation. The second telescopic driving member is placed between the outer wall of the first pipe fitting and the inner wall of the second pipe fitting to prevent the second telescopic driving member from detaching. In addition, two ends of the second telescopic driving member respectively abut against the first protruding portion and the second protruding portion, which is convenient for controlling the relative position between the first pipe fitting and the second pipe fitting, and prevents the first pipe fitting from detaching from the second pipe fitting during the process of the first pipe fitting and the second pipe fitting moving relatively away from each other.

[0030] Preferably, the second pipe fitting includes a second pipe fitting body and a retaining ring. The retaining ring is connected to the end of the second pipe fitting body and sleeved on the outer peripheral side of the first pipe fitting, and the inner diameter of the retaining ring is smaller than the inner diameter of the second pipe fitting body to form the second protruding portion.

[0031] In this solution, adopting the above structural form, the second pipe fitting is separately provided, which is convenient for processing. In addition, if any one of the second pipe fitting body and the retaining ring is damaged, only one of them needs to be replaced, saving costs, and the second protruding portion is formed by installing the retaining ring, which is convenient for assembly.

[0032] Preferably, the second telescopic driving member is a second shape memory alloy elastic member.

[0033] In this solution, adopting the above structural form, no electric drive is required, and a mechanical structure is adopted to realize 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.

[0034] Preferably, a sealing ring is provided between the outer wall of the first pipe fitting and the inner wall of the second pipe fitting.

[0035] In this solution, adopting the above structural form, it prevents water flow from flowing out of the gap between the outer wall of the first pipe fitting and the inner wall of the second pipe fitting, making the anti-freezing and cracking valve body have good sealing performance.

[0036] 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.

[0037] Preferably, the anti-freezing and cracking valve body is connected to the water inlet pipeline. An outlet is opened at one end of the first pipe fitting far from the second pipe fitting, and a movable connecting pipe is installed between the outlet and the water inlet pipeline.

[0038] In this solution, the above structural form is adopted to reduce or avoid the phenomenon that the water inlet pipe needs to move with the movement of the first fitting, resulting in damage, and there is no need to consider reserving a larger assembly space for the water inlet pipe when its movement is required, so the structure is compact.

[0039] The positive and progressive effects of the present invention are as follows:

[0040] In the anti-freezing and cracking valve body of the present invention, in the case of severe cold in winter, when the water temperature drops to the second temperature, the clamping part and the clamping piece are disengaged from the clamping relationship, so that the first fitting and the second fitting can move relatively. Once the water freezes, the volume of the water increases during the freezing process, pushing the first fitting and the second fitting to move relatively away, and the increased volume after the water freezes is released. The water flow channel space between the first fitting and the second fitting becomes larger, 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 flooded, and electrical leakage, as well as situations endangering safety. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of the clamping piece in the first state in the anti-freezing and cracking valve body of the preferred embodiment of the present invention.

[0042] Figure 2 It is a schematic structural diagram of the clamping piece in the second state in the anti-freezing and cracking valve body of the preferred embodiment of the present invention.

[0043] Figure 3 It is a schematic installation diagram of the anti-freezing and cracking valve body of the preferred embodiment of the present invention in a gas water heater.

[0044] Description of the Reference Numerals:

[0045] The first fitting 1

[0046] The clamping part 11

[0047] The first protruding part 12

[0048] The water outlet 13

[0049] The second fitting 2

[0050] The second fitting body 21

[0051] The clamping piece 211

[0052] The clamping rod 2111

[0053] The first rod 21111

[0054] The second rod 21112

[0055] The first telescopic driving part 2112

[0056] Spring 2113

[0057] Through-hole 212

[0058] Sleeve 213

[0059] Second protruding portion 214

[0060] Water inlet 215

[0061] Retaining ring 22

[0062] Reset member 3

[0063] Second telescopic driving member 31

[0064] Sealing ring 4

[0065] Water inlet pipe 5

[0066] Movable connecting pipe 6 Detailed implementation manner

[0067] The present invention will be further described below by way of examples, but the present invention is not limited to the following example scope for this reason.

[0068] An embodiment of the present invention provides an anti-freezing crack valve body, as shown in Figure 1 and Figure 2 . The anti-freezing crack valve body includes a first pipe fitting 1 and a second pipe fitting 2. At least part of the first pipe fitting 1 is placed inside the second pipe fitting 2 and communicates with the second pipe fitting 2. The outer wall of the first pipe fitting 1 has a clamping portion 11, and the side wall of the second pipe fitting 2 has a clamping member 211. The clamping member 211 has a first state and a second state. When the clamping member 211 is in the first state, the clamping member 211 can be clamped with the clamping portion 11 so that the first pipe fitting 1 and the second pipe fitting 2 are relatively fixed; when the clamping member 211 is in the second state, the clamping member 211 can be disengaged from the clamping portion 11 so that the first pipe fitting 1 and the second pipe fitting 2 can move relatively. During the process of the temperature dropping from the first temperature to the second temperature, the clamping member 211 switches from the first state to the second state, the clamping portion 11 is disengaged from the clamping member 211, and the first pipe fitting 1 and the second pipe fitting 2 can move relatively away from each other under the action of an external force to realize that the space of the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 becomes larger. Among them, the first temperature is that the water temperature is above 0 °C, and the second temperature is that the water temperature is below 0 °C. When the temperature is at the first temperature, the clamping member 211 is in the first state, and the relative position between the first pipe fitting 1 and the second pipe fitting 2 is as shown in Figure 1 ; when the temperature drops from the first temperature to the second temperature, the clamping member 211 switches to the second state, and the relative position between the first pipe fitting 1 and the second pipe fitting 2 is as shown in Figure 2As 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 becomes larger.

[0069] In this embodiment, in the case of severe cold in winter, when the water temperature drops to the second temperature, the clamping portion 11 and the clamping member 211 are disengaged from the clamping relationship, so that the first pipe fitting 1 and the second pipe fitting 2 can move relative to each other. Once the water freezes, the volume of the water increases during the freezing process, pushing the first pipe fitting 1 and the second pipe fitting 2 to move away from each other relatively. The increased volume after the water freezes is released, and the space of the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 becomes larger, 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 in water, and electrical leakage, and situations endangering safety.

[0070] A through hole 212 is formed in the side wall of the second pipe fitting 2 and is connected with a sleeve 213. The clamping member 211 is placed in the sleeve 213, and the clamping member 211 can pass through the through hole 212 and be clamped with the clamping portion 11. Specifically, the sleeve 213 is connected to the outer wall of the second pipe fitting 2, the through hole 212 communicates with the inner cavity of the sleeve 213, and when the clamping member 211 passes through the through hole 212, that is, the clamping member 211 passes through the side wall of the second pipe fitting 2 and is clamped with the clamping portion 11 on the outer wall of the first pipe fitting 1. The clamping member 211 is placed in the sleeve 213, reducing the scouring of the water flow on the clamping member 211, thereby reducing the wear of the clamping member 211 and prolonging the service life of the clamping member 211. The through hole 212 provided on the sleeve 213 enables the clamping member 211 to be clamped with the first pipe fitting 1.

[0071] In this embodiment, the clamping member 211 includes a clamping rod 2111 and a first telescopic driving member 2112. During the switching process between the first temperature and the second temperature, the first telescopic driving member 2112 drives the clamping rod 2111 to move along the through hole 212 through expansion and contraction. During the switching process between the first temperature and the second temperature, the first telescopic driving member 2112 drives the clamping rod 2111 to move along the through hole 212 through expansion and contraction. During the process of decreasing from the first temperature to the second temperature, affected by the temperature, the expansion and contraction amount of the first telescopic driving member 2112 changes, driving the clamping rod 2111 connected thereto to pass through the through hole 212 to be clamped with the first pipe fitting 1, 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 expansion and contraction amount of the first telescopic driving member 2112 changes, driving the clamping rod 2111 connected thereto to move away from the clamping portion 11, so that the first pipe fitting 1 and the second pipe fitting 2 can move relatively. The first telescopic driving member 2112 changes its expansion and contraction amount according to the temperature change, so as to drive the clamping rod 2111 to move in the direction away from or close to the clamping portion 11, thereby controlling the clamping relationship between the clamping rod 2111 and the clamping portion 11, which is convenient for automatic control and easy to manage.

[0072] In this embodiment, the clamping rod 2111 includes a first rod member 21111 and a second rod member 21112 which are cross-fixed. The first telescopic driving member 2112 is sleeved on the outer peripheral side of the first rod member 21111, and one end of the first telescopic driving member 2112 abuts against the end face of the second rod member 21112 that is away from the first pipe fitting 1, and the other end of the first telescopic driving member 2112 abuts against the inner wall of the sleeve 213 to drive the first rod member 21111 to move along its extending direction. Since the first rod member 21111 and the second rod member 21112 are cross-fixed, during the process that the first telescopic driving member 2112 expands and contracts to push the second rod member 21112 to move, the first rod member 21111 moves in the direction away from or close to the inner wall of the sleeve 213 that abuts against the first telescopic driving member 2112, thereby realizing the cooperation between the clamping rod 2111 and the clamping portion 11. The spatial layout is reasonable and compact, and the structure is simple and convenient for processing.

[0073] The first telescopic driving member 2112 is a first shape memory alloy elastic member. During the process of the temperature dropping from the first temperature to the second temperature, the first shape memory alloy elastic member shrinks, driving the first rod member 21111 to move away from the clamping portion 11; during the process of the temperature rising from the second temperature to the first temperature, the first shape memory alloy elastic member elongates, pushing the first rod member 21111 to move towards the clamping portion 11. Without the need for electric drive and adopting a mechanical structure, the clamping and unclamping relationship between the clamping member 211 and the clamping portion 11 is realized, with good reliability. When the power is off, it can provide effective protection. Preferably, the first telescopic driving member 2112 is a shape memory alloy spring, which is convenient to process and has good telescopic performance.

[0074] The second rod member 21112 is connected to the middle of the first rod member 21111. The clamping member 211 further includes a spring 2113 sleeved on the outer peripheral side of the first rod member 21111. One end of the spring 2113 abuts against the end face of the second rod member 21112 close to the first pipe fitting 1, and the other end of the spring 2113 abuts against the outer wall of the second pipe fitting 2. A spring is provided to limit the distance that the first rod member 21111 extends out of the through hole 212, preventing the first rod member 21111 from extending too long and damaging the first pipe fitting 1. Among them, the spring can be an ordinary spring or a shape memory alloy spring.

[0075] Specifically, the first rod member 21111 and the second rod member 21112 are arranged perpendicular to each other, and the length direction of the first rod member 21111 and the axis direction of the through hole 212 are on the same straight line, so the possibility of the first rod member 21111 being blocked when passing through the through hole 212 is small. One end of the sleeve 213 away from the first pipe fitting 1 has a receiving cavity to prevent the first rod member 21111 from having contact interference with the sleeve 213 when moving along its length direction, and the spatial layout is reasonable.

[0076] A groove is formed on the outer wall of the first pipe fitting 1 to form the clamping portion 11, and the groove cooperates with the clamping rod 2111 for clamping. Forming a groove on the outer wall of the first pipe fitting 1 is convenient for processing, and a clamping relationship is formed through the cooperation between the clamping rod 2111 and the groove, and the clamping effect is stable.

[0077] The anti-freezing crack valve body includes a reset member 3. During the process of the temperature rising from the second temperature to the first temperature, the reset member 3 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 the temperature rising from the second temperature to the first temperature, the reset member 3 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.

[0078] The reset member 3 includes a second telescopic driving member 31. The two ends of the second telescopic driving member 31 respectively abut against 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 second telescopic driving member 31 realizes the relative movement of the first pipe fitting 1 and the second pipe fitting 2 by stretching. According to the change of temperature, the second telescopic driving member 31 realizes the relative movement of 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 realize automatic reset.

[0079] In this embodiment, the second telescopic driving member 31 is sleeved on the outer peripheral side of the first pipe fitting 1 and is disposed between the first pipe fitting 1 and the second pipe fitting 2. The outer wall of the first pipe fitting 1 has a first protrusion 12, and the inner wall of the second pipe fitting 2 has a second protrusion 214. The two ends of the second telescopic driving member 31 respectively abut against the first protrusion 12 and the second protrusion 214. The second telescopic driving member 31 is sleeved on the outer peripheral side of the first pipe fitting 1, which is convenient for installation. The second telescopic driving member 31 is disposed between the outer wall of the first pipe fitting 1 and the inner wall of the second pipe fitting 2 to prevent the second telescopic driving member 31 from detaching. In addition, the two ends of the second telescopic driving member 31 respectively abut against the first protrusion 12 and the second protrusion 214, which is convenient for controlling the relative position between the first pipe fitting 1 and the second pipe fitting 2, and prevents the first pipe fitting 1 from detaching from the second pipe fitting 2 during the process of the first pipe fitting 1 and the second pipe fitting 2 moving relatively away from each other.

[0080] In this embodiment, the second pipe fitting 2 includes a second pipe fitting body 21 and a retaining ring 22. The retaining ring 22 is connected to the end of the second pipe fitting body 21 and is sleeved on the outer peripheral side of the first pipe fitting 1, and the inner diameter of the retaining ring 22 is smaller than the inner diameter of the second pipe fitting body 21 to form a second protrusion 214. The second pipe fitting 2 is separately provided, which is convenient for processing. In addition, if any one of the second pipe fitting body 21 and the retaining ring 22 is damaged, only one of them needs to be replaced, which saves costs, and the second protrusion 214 is formed by installing the retaining ring 22, and the assembly is convenient. Specifically, the retaining ring 22 is installed at the end of the second pipe fitting body 21 and is bolted to the second pipe fitting body 21, and the disassembly is convenient.

[0081] The second telescopic driving member 31 is a second shape memory alloy elastic member. The second shape memory alloy elastic member changes its own telescopic amount with the change of temperature. When the temperature rises, its elasticity increases and the second shape memory alloy elastic member elongates; when the temperature drops, its elasticity decreases and the second shape memory alloy elastic member contracts. During the process of the temperature dropping from the first temperature to the second temperature, the engaging member 211 is disengaged from the engaging portion 11. As water freezes, its volume increases, pushing the first pipe fitting 1 and the second pipe fitting 2 away from each other relatively, reserving space for the expandable water flow channel after the water freezes, so that the space after the water freezes can be released. At this time, the second shape memory alloy elastic member contracts and does not interfere with the relative movement of the first pipe fitting 1 and the second pipe fitting 2. When the temperature rises from the second temperature to the first temperature, the second shape memory alloy elastic member elongates, causing the first pipe fitting 1 and the second pipe fitting 2 to approach each other and return to their initial relative positions to achieve reset. The anti-freezing and cracking valve body of this embodiment does not require electric drive and adopts a mechanical structure to enable the water flow channel between the first pipe fitting 1 and the second pipe fitting 2 to be adjustable according to the change of temperature, with good reliability and effective protection when power is off. Preferably, the second telescopic driving member 31 is a shape memory alloy spring, which is convenient to process and has good telescopic performance. In addition, the first shape memory alloy elastic member and the second shape memory alloy elastic member can be made of the same material.

[0082] A sealing ring 4 is provided between the outer wall of the first pipe fitting 1 and the inner wall of the second pipe fitting 2. The setting of the sealing ring 4 prevents water flow from flowing out through the gap between the outer wall of the first pipe fitting 1 and the inner wall of the second pipe fitting 2, making the anti-freezing and cracking valve body have good sealing performance.

[0083] During specific use, during normal use, the engaging member 211 is in the first state, and the engaging member 211 and the engaging portion 11 are engaged, so that the second pipe fitting 2 does not move relative to the first pipe fitting 1. When the temperature drops, 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 first shape memory alloy elastic member compresses, causing the engaging rod 2111 to move away from the engaging portion 11 and be disengaged from the first pipe fitting 1. As water freezes, its volume increases and can push the first pipe fitting 1 away from the second pipe fitting 2 in a direction away from the second pipe fitting 2, reserving space for the expandable water flow channel after the water freezes, so that the space after the water freezes can be released. At this time, the second shape memory alloy elastic member contracts 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 second shape memory alloy elastic member elongates, causing the first pipe fitting 1 to gradually approach the second pipe fitting 2 and return to its initial relative position. At the same time, the first shape memory alloy elastic member gradually elongates and pushes the engaging rod 2111 into the groove of the first pipe fitting 1, 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 adopts a pure mechanical mechanism and can provide effective protection in severe winter conditions, especially when power is off.

[0084] An embodiment of the present invention further provides a gas water heater, as Figure 3 shown, the gas water heater includes a freeze-crack prevention valve body as described in any of the above embodiments.

[0085] In this embodiment, the freeze-crack prevention valve body is connected to the water inlet pipeline 5. An outlet 13 is opened at one end of the first pipe fitting 1 far from the second pipe fitting 2. A movable connecting pipe 6 is installed between the outlet 13 and the water inlet pipeline 5. An inlet 215 is opened on the side wall of the second pipe fitting 2 near the first pipe fitting 1. 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 freeze-crack prevention valve body through the outlet 13 to enter the water inlet pipeline 5. Since the first pipe fitting 1 can move in a direction away from or close to the second pipe fitting 2, the first pipe fitting 1 is movably arranged. One end of the first pipe fitting 1 far from the second pipe fitting 2 is connected to the water inlet pipeline 5 through the movable connecting pipe 6, reducing or avoiding the phenomenon that the water inlet pipeline 5 needs to move along with the movement of the first pipe fitting 1, resulting in damage, and there is no need to consider reserving a larger assembly space for the water inlet pipeline 5 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 crack valve body includes: A first pipe fitting, the outer wall of the first pipe fitting having a clamping portion; A second pipe fitting, at least a part of the first pipe fitting being placed inside the second pipe fitting and communicating with the second pipe fitting, and a clamping member being provided on the side wall of the second pipe fitting; The clamping member has a first state and a second state. When the clamping member is in the first state, the clamping member can be clamped with the clamping portion so that the first pipe fitting and the second pipe fitting are relatively fixed; when the clamping member is in the second state, the clamping member can be disengaged from the clamping portion so that the first pipe fitting and the second pipe fitting can move relatively; During the process of the temperature dropping from the first temperature to the second temperature, the clamping member switches from the first state to the second state, the clamping portion and the clamping member are disengaged from the clamping relationship, and 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 increase the space of the water flow channel between the first pipe fitting and the second pipe fitting; A through hole is formed in the side wall of the second pipe fitting and a sleeve is connected thereto, the clamping member being placed inside the sleeve, and the clamping member can pass through the through hole and be clamped with the clamping portion; The clamping member includes a clamping rod and a first telescopic driving member. During the process of switching between the first temperature and the second temperature, the first telescopic driving member drives the clamping rod to move along the through hole through telescoping; The clamping rod includes a first rod member and a second rod member that are cross-fixed. The first telescopic driving member is sleeved on the outer peripheral side of the first rod member, and one end of the first telescopic driving member abuts against the end face of the second rod member that is away from the first pipe fitting, and the other end of the first telescopic driving member abuts against the inner wall of the sleeve to drive the first rod member to move along its extending direction.

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, characterized in that, The second rod member is connected to the middle of the first rod member. The clamping member further includes a spring sleeved on the outer peripheral side of the first rod member. One end of the spring abuts against the end face of the second rod member that is close to the first pipe fitting, and the other end of the spring abuts against the outer wall of the second pipe fitting.

4. The anti-cracking valve body according to claim 1, characterized in that, The anti-freezing crack 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.

5. The anti-cracking valve body according to claim 4, wherein The reset member includes a second telescopic driving member. The two ends of the second telescopic driving member respectively abut against the first pipe fitting and the second pipe fitting. During the process of the temperature rising from the second temperature to the first temperature, the second telescopic driving member realizes the relative movement of the first pipe fitting and the second pipe fitting through stretching.

6. The anti-cracking valve body according to claim 5, characterized in that, The second telescopic driving member is sleeved on the outer peripheral side of the first pipe fitting and is placed between the first pipe fitting and the second pipe fitting. The outer wall of the first pipe fitting has a first protruding portion, and the inner wall of the second pipe fitting has a second protruding portion. The two ends of the second telescopic driving member respectively abut against the first protruding portion and the second protruding portion.

7. The anti-cracking valve body according to claim 6, wherein The second pipe fitting includes a second pipe fitting body and a retaining ring. The retaining ring is connected to the end of the second pipe fitting body and sleeved on the outer peripheral side of the first pipe fitting, and the inner diameter of the retaining ring is smaller than the inner diameter of the second pipe fitting body to form the second protruding portion.

8. The anti-cracking valve body according to claim 5, characterized in that, The second telescopic driving member is a second shape memory alloy elastic member.

9. The anti-cracking valve body according to claim 1, wherein A sealing ring is provided between the outer wall of the first pipe fitting and the inner wall of the second pipe fitting.

10. 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 1-9.

11. The gas water heater according to claim 10, 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 first pipe fitting away from the second pipe fitting, and a movable connecting pipe is installed between the outlet and the water inlet pipeline.

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