An electric water heater safety valve and an electric water heater

Abstract

The present invention discloses a safety valve for an electric water heater, comprising: a valve body, characterized in that a pressure regulating chamber is arranged in the valve body, the pressure regulating chamber comprises two mutually connected large and small chambers, a water supply port and a water outlet are arranged on the side wall of the small chamber, the water supply port and the water outlet are arranged in an axially offset manner along the small chamber, a first gasket is arranged in the small chamber, the first gasket is in sealing contact with the inner wall of the small chamber and can slide along the axial direction of the small chamber, and the water supply port and the water outlet can be connected or disconnected with the change of the position of the first gasket; a second gasket is arranged in sealing contact with the inner wall of the large chamber in the large chamber, the second gasket and the first gasket are connected by a push rod; an adjusting rotary rod is arranged on the side of the second gasket away from the push rod, a push rod spring is arranged between the adjusting rotary rod and the second gasket, and the compression amount of the push rod spring is changed by changing the screw-in distance of the adjusting rotary rod.

Description

Technical Field

[0001] The invention relates to the technical field of water heating equipment, and in particular to a safety valve for an electric water heater and an electric water heater. Background Art

[0002] When the water in the tank of a storage electric water heater is heated, the water volume increases due to the principle of thermal expansion, resulting in an increase in the tank pressure. The tank pressure must be within the pressure range to be used safely. 90% of the existing electric water heater products have a one-way safety valve at the water inlet end. When the water pressure in the tank reaches the pressure relief value of the safety valve, the safety valve releases the pressure, and the pressure relief port drips to relieve the pressure, ensuring that the pressure in the tank does not exceed the limit value. When using electric water heaters, most users do not close the water inlet valve, but only close the water outlet valve, resulting in the same pressure in the tank and the user's water pressure at any time. Different users are located in different areas and floors. When the user's water pressure is too high, the pressure value is greater than the pressure relief value, and the electric water heater begins to release pressure and drip, affecting the user experience. Due to the high secondary pressurized water pressure of high-rise users, the safety valve begins to release pressure and leak water before heating. At this time, a pressure reducing valve needs to be added to the water inlet end, but it is difficult for users to accept it, and the pressure reducing valve is large in size and has a high installation cost. Summary of the invention

[0003] In view of the problems existing in the prior art, the object of the present invention is to provide a safety valve for an electric water heater which can significantly reduce the occurrence of dripping and can adjust the opening pressure.

[0004] Another object of the present invention is to provide an electric water heater using the above safety valve.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A safety valve for an electric water heater comprises: a valve body, characterized in that a pressure regulating chamber is arranged in the valve body, the pressure regulating chamber comprises two large and small chambers which are interconnected, a water supply port and a water outlet are arranged on the side wall of the small chamber, the water supply port and the water outlet are arranged in an axially offset manner along the small chamber, a first gasket is arranged in the small chamber, the first gasket is in sealing contact with the inner wall of the small chamber and can slide along the axial direction of the small chamber, and the water supply port and the water outlet can be connected or disconnected as the position of the first gasket changes; a second gasket is arranged in sealing contact with the inner wall of the large chamber in the large chamber, the second gasket and the first gasket are connected by a push rod; an adjusting rotary rod is arranged on the side of the second gasket away from the push rod, a push rod spring is arranged between the adjusting rotary rod and the second gasket, and the compression amount of the push rod spring is changed by changing the screw-in distance of the adjusting rotary rod.

[0007] As a further illustration of the above solution, a plug is provided on the large cavity to seal the cavity opening, and the adjusting rotary rod is threadedly connected to the plug.

[0008] As a further illustration of the above solution, a knob is fixed on the adjusting rotary rod, and a ventilation channel runs through the adjusting rotary rod and the knob to the large cavity.

[0009] As a further illustration of the above solution, a water supply channel is connected to the water supply port, and an internal pressure relief device is provided in the water supply channel.

[0010] As a further illustration of the above scheme, the internal pressure relief device includes an inner shell, and an inner row component installed in the inner shell; the inner shell is in a step shape, a first spring is provided on the upper outer periphery of the inner shell, an inner shell sealing ring is provided on the lower outer periphery of the inner shell, the inner shell and the water supply channel are tightly fitted through the inner shell sealing ring, and the bottom of the inner shell is tightly fitted with the water supply nut screwed at the water inlet of the water supply channel under the action of the first spring; the inner row component includes a valve seat, a valve core movably passing through the valve seat, and an inner row spring provided between the valve core and the valve seat; the valve core is provided with upper and lower limit steps for axial limiting; the valve seat is pressed against the bottom opening of the inner shell by the second spring.

[0011] As a further illustration of the above solution, a pressure relief channel communicating with the small cavity is provided on a side of the small cavity away from the large cavity, and a pressure relief device is provided in the pressure relief channel.

[0012] As a further illustration of the above solution, a step opening is provided on the inner circumferential surface of the connection between the pressure relief channel and the small cavity, and a pressure relief water outlet is provided on the side wall of the pressure relief channel.

[0013] As a further illustration of the above scheme, the pressure relief device includes: a pressure relief push rod, one end of which is provided with a pressure relief gasket for blocking the step opening, and the other end is located outside the pressure relief channel and is connected to a pressure relief handle; a pressure relief spring is provided between the inner wall of the pressure relief channel and the pressure relief push rod.

[0014] As a further illustration of the above solution, a pressure relief plug is provided at one end of the pressure relief channel away from the step opening, and the pressure relief push rod passes through the pressure relief plug.

[0015] An electric water heater comprises an electric water heater body and an inner tank arranged on the electric water heater body, the inner tank is provided with a water inlet end and a water outlet end, and a safety valve is provided at the water inlet end, characterized in that the safety valve is the electric water heater safety valve described in any one of the above items.

[0016] The beneficial effects of the present invention are:

[0017] 1. In actual operation, the compression amount of the push rod spring is changed by changing the screwing distance of the adjusting screw rod, thereby achieving the purpose of adjusting the opening pressure; when the water inlet pressure is greater than the opening pressure, the water inlet pressure pushes the second gasket to move right, and the first gasket also moves right, thereby isolating the water supply port and the water outlet, preventing the external water pressure from entering the inner tank again, thereby avoiding the pressure relief and drainage caused by excessive water inlet pressure when the electric water heater is in use, which can greatly reduce the occurrence of dripping. At the same time, since the opening pressure is adjustable, it can be appropriately adjusted according to the user's family water pressure, which can adapt to the influence of water pressure in different environments and different regions on the use of electric water heaters, and ensure the normal use of electric water heaters.

[0018] 2. An internal discharge component and a pressure relief device are provided in the water supply channel. When the water inlet pressure is greater than the internal discharge pressure, the internal discharge component will first perform internal discharge; the pressure relief device ensures the safety of the electric water heater.

[0019] 3. The electric water heater safety valve provided by the present invention has a simple structure, a small size, a low cost and is easy to install, and can be delivered and installed with the whole machine as an accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a front view of the safety valve of the electric water heater provided by the present invention.

[0021] Figure 2 Shown is a stereoscopic view of the safety valve of the electric water heater provided by the present invention.

[0022] Figure 3 Shown is an exploded view of the safety valve of the electric water heater provided by the present invention.

[0023] Figure 4 Shown is a structural diagram of the inner row component of the electric water heater safety valve provided by the present invention.

[0024] Figure 5 Shown is a cross-sectional view of the inner row component of the electric water heater safety valve provided by the present invention.

[0025] Figure 6 The figure shows a cross-sectional view of the safety valve of the electric water heater provided by the present invention when the water inlet pressure is greater than the opening pressure.

[0026] Figure 7 The figure shows a cross-sectional view of the safety valve of the electric water heater provided by the present invention when the water inlet pressure is less than the opening pressure.

[0027] Figure 8 The figure shows a cross-sectional view of the safety valve of the electric water heater provided by the present invention when the water inlet pressure is greater than the opening pressure and the inner tank pressure reaches the relief pressure state.

[0028] Description of reference numerals:

[0029] 1: pressure relief plug, 2: pressure relief spring, 3: pressure relief push rod, 4: valve body, 5: pressure relief handle, 6: pressure relief plug, 7: first spring, 8: inner shell, 9: water inlet nut, 10: second spring, 11: valve seat, 12: valve core, 13: inner row spring, 14: push rod spring, 15: push rod, 16: adjusting rotary rod, 17: knob, 18: plug, 19: pressure relief outlet, 20: water outlet, 21: water supply port. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "at least" means one or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the invention, unless otherwise specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “below”, and “above” a second feature includes that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “above”, “below”, and “below” a second feature includes that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] The following is a further description of the specific implementation of the present invention in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the present invention are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the present invention, but cannot be understood as limiting the present invention.

[0035] Embodiment 1

[0036] like Figure 1-Figure 8 As shown, a safety valve for an electric water heater comprises: a valve body 4, characterized in that a pressure regulating chamber is arranged in the valve body 4, the pressure regulating chamber comprises two interconnected large and small chambers, a water supply port 21 and a water outlet 20 are arranged on the side wall of the small chamber, the water supply port 21 and the water outlet 20 are arranged in an axially offset manner along the small chamber, a first gasket is arranged in the small chamber, the first gasket is in sealing contact with the inner wall of the small chamber and can slide along the axial direction of the small chamber, and the water supply port 21 and the water outlet 20 can be connected or disconnected with the change of the position of the first gasket; a second gasket is arranged in sealing contact with the inner wall of the large chamber in the large chamber, the second gasket and the first gasket are connected by a push rod 15; an adjusting rotary rod 16 is arranged on the side of the second gasket away from the push rod, a push rod spring 14 is arranged between the adjusting rotary rod 16 and the second gasket, and the compression amount of the push rod spring 14 is changed by changing the screw-in distance of the adjusting rotary rod 16.

[0037] A plug 18 for sealing the cavity opening is provided on the large cavity, and the adjusting rotary rod 16 is threadedly connected to the plug 18 .

[0038] A knob 17 is fixed on the adjusting rotary rod 16, and a ventilation channel runs through the adjusting rotary rod 16 and the knob 17 to the large cavity. In this embodiment, the middle part of the adjusting rotary rod 16 is a threaded structure, which is threadedly connected to the plug 18; the rotary rod 16 is snap-connected with the knob 17. By rotating the knob 17, the advancement amount of the rotary rod 16 can be adjusted, and then the compression amount of the push rod spring 14 can be adjusted to achieve the purpose of adjusting the opening pressure. The ventilation channel is used to communicate with the outside to ensure that the push rod spring 14 can be compressed.

[0039] Preferably, a water supply channel is connected to the water supply port 21, and an internal pressure relief device is provided in the water supply channel. The internal pressure relief device includes an inner shell 8 and an inner row component installed in the inner shell 8; the inner shell 8 is stepped, and the upper end surface of the inner shell 8 is provided with a through hole for water flow to pass through, a first spring 7 is provided on the upper periphery of the inner shell 8, and an inner shell sealing ring is provided on the lower periphery of the inner shell 8. The inner shell 8 and the water supply channel are tightly fitted through the inner shell sealing ring, and the bottom of the inner shell is tightly fitted with the water supply nut 9 screwed at the water inlet of the water supply channel under the action of the first spring 7.

[0040] The inner row component includes a valve seat 11, a valve core 12 that movably passes through the valve seat 11, and an inner row spring 13 arranged between the valve core 12 and the valve seat 11; the valve core 12 is provided with upper and lower limit steps for axial limiting; the valve seat 11 is pressed against the bottom opening of the inner shell by the second spring 10.

[0041] The inner row assembly is arranged inside the inner shell 8, and a second spring 10 is arranged on the outer periphery of the inner row assembly; the inner row assembly is fixed in the water supply channel through the second spring 10 and the water inlet nut 9. Under the action of the second spring 10, the inner row assembly is tightly attached to the water inlet nut 9 and blocks the water inlet through hole of the water inlet nut. When water enters the water supply channel, the water pressure compresses the second spring to push the inner row assembly inward, and the water flows through the gap between the inner row assembly and the inner shell. When the water inlet pressure is greater than the water pressure, the second spring resets the inner row assembly to block the water inlet through hole of the water inlet nut. When the water inlet pressure reaches the inner row pressure, the valve core 12 compresses the inner row spring 13 downward to achieve the purpose of inner row.

[0042] Preferably, a pressure relief passage communicating with the small cavity is provided on a side of the small cavity away from the large cavity, and a pressure relief device is provided in the pressure relief passage.

[0043] A step opening is provided on the inner circumference of the connection between the pressure relief channel and the small cavity, and a pressure relief water outlet 19 is provided on the side wall of the pressure relief channel.

[0044] The pressure relief device includes a pressure relief push rod 3, an opening for the pressure relief push rod to extend into is provided on the pressure relief plug 1, a pressure relief washer for blocking the step opening of the pressure relief channel is provided at one end of the pressure relief push rod 3, and a pressure relief handle 5 is connected to the other end outside the pressure relief channel, and a pressure relief spring 2 is provided between the inner wall of the pressure relief channel and the pressure relief push rod 3. The user can move the pressure relief handle 5 to relieve pressure by himself, and move the pressure relief push rod 3 to remove the pressure relief washer from the step opening of the pressure relief channel. There is a gap between the pressure relief washer and the pressure relief channel, and the water in the inner tank flows from the water outlet 20 to the pressure relief channel and then flows out through the pressure relief outlet 19, thereby reducing the pressure in the inner tank.

[0045] A pressure relief plug 1 is provided at one end of the pressure relief channel away from the step opening, and the pressure relief push rod 3 passes through the pressure relief plug 1 .

[0046] Further preferably, the pressure relief push rod 3 is connected to the pressure relief handle 5 via a pressure relief bolt 6 .

[0047] The pressure relief plug 1, the plug 18, the water inlet nut 9 and the valve body 4 are all connected by threads; the pressure relief plug 1, the plug 18, the water inlet nut 9 and the valve body 4 are provided with sealing rings. The sealing rings are provided to ensure the sealing effect and prevent the safety valve from leaking.

[0048] A first sealing ring is provided at the bottom of the valve seat 11; a second sealing ring is provided on the front end surface of the pressure relief gasket; and a third sealing ring is provided on the side of the push rod gasket to increase the sealing effect and reduce collision wear.

[0049] In actual operation, water flows through the water supply channel, the inner row assembly, the water supply port 21, the small cavity, and the water outlet 20 into the inner tank. Because the water supply port 21 and the water outlet 20 are arranged alternately, in this embodiment, the water supply port 21 is arranged on the lower right side of the small cavity, and the water outlet 20 is arranged on the upper left side of the water inlet channel. When the water pressure is greater than the water inlet pressure, the water flows into the inner tank. When the water inlet pressure is greater than the water pressure, the water cannot enter the inner tank. When the water inlet pressure is greater than the inner row pressure, the inner row assembly is affected by the water inlet pressure, and the valve core squeezes the inner row spring for inner row. When the water inlet pressure is less than the opening pressure, the first gasket is at the lower left side of the water outlet, and the water outlet is connected with the water supply port; when the water inlet pressure is greater than the opening pressure, the push rod moves right under the action of the water inlet pressure, and the first gasket blocks the water outlet and the water supply port, thereby avoiding the pressure relief water discharge caused by excessive water inlet pressure, which can greatly reduce the occurrence of dripping. During the heating process, the pressure in the inner tank gradually increases. When the pressure in the inner tank is greater than the relief pressure, the pressure relief push rod is pushed to the left so that the push rod gasket leaves the step opening of the pressure relief channel. There is a gap between the push rod gasket and the wall of the pressure relief channel. Water flows out from the pressure relief outlet to ensure that the pressure in the inner tank does not exceed the standard. The relief pressure should be less than the limit pressure that the inner tank can withstand.

[0050] Compared with the prior art, the electric water heater safety valve provided in this embodiment has the following characteristics: 1) By changing the screw-in distance of the adjusting rotary rod, the compression amount of the push rod spring is changed, thereby achieving the purpose of adjusting the opening pressure. When the water inlet pressure is greater than the opening pressure, the first gasket blocks the connection between the water outlet and the water supply port, ensuring that the pressure in the inner tank is much smaller than the water pressure, ensuring that the electric water heater can greatly reduce the occurrence of dripping when in use; the opening pressure can be adjusted by adjusting the rotary rod according to the user's home water pressure, and can adapt to the influence of water pressure in different environments and different regions on the use of electric water heaters, ensuring the normal use of electric water heaters. 2) An internal discharge component and a pressure relief device are provided in the water supply channel. When the water inlet pressure is greater than the internal discharge pressure, the internal discharge component is first discharged; the pressure relief device ensures the safety of the electric water heater. 3) The structure is simple, the volume is small, the cost is low and the installation is convenient. It can be installed as an accessory with the whole machine.

[0051] Embodiment 2

[0052] An electric water heater comprises an electric water heater body and an inner tank arranged on the electric water heater body, the inner tank is provided with a water inlet end and a water outlet end, and a safety valve is provided at the water inlet end, characterized in that the safety valve is the electric water heater safety valve described in Example 1.

[0053] Compared with the prior art, the electric water heater provided in this embodiment has all the beneficial effects of the first embodiment. As for the specific structure of the electric water heater, it can be various structures currently known or achievable in the future, which will not be described in detail here.

[0054] Through the description of the above structure and principle, those skilled in the art should understand that the present invention is not limited to the above specific implementations, and improvements and substitutions based on the present invention using the known technology in the art fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims and their equivalents. Parts not described in the specific implementations are prior art or common knowledge.

Claims

1. An electric water heater safety valve, comprising: a valve body, characterized in that a pressure regulating chamber is provided in the valve body, the pressure regulating chamber includes two large and small cavities communicating with each other, a water supply port and a water outlet are provided on the side wall of the small cavity, the water supply port and the water outlet are arranged axially offset along the small cavity, a first gasket is provided in the small cavity, the first gasket is in sealing contact with the inner wall of the small cavity and can slide axially along the small cavity, and the communication and disconnection of the water supply port and the water outlet can be realized with the change of the position of the first gasket; a second gasket in sealing contact with the inner wall of the large cavity is provided in the large cavity, and the second gasket and the first gasket are connected by a push rod; an adjusting screw rod is provided on the side of the second gasket away from the push rod, and a push rod spring is provided between the adjusting screw rod and the second gasket, and the compression amount of the push rod spring is changed by changing the screwing-in distance of the adjusting screw rod; a water supply channel is connected to the water supply port, and an internal pressure relief device is provided in the water supply channel; a pressure relief channel communicating with the small cavity is provided on the side of the small cavity away from the large cavity, and a pressure relief device is provided in the pressure relief channel.

2. The electric water heater safety valve according to claim 1, characterized in that a plug for sealing the cavity opening is provided on the large cavity, and the adjusting screw rod is threadedly connected to the plug.

3. The electric water heater safety valve according to claim 2, characterized in that a knob is fixed on the adjusting screw rod, and a ventilation channel penetrates through the adjusting screw rod and the knob to the inside of the large cavity.

4. The electric water heater safety valve according to claim 1, characterized in that the internal pressure relief device includes an inner shell and an internal discharge assembly installed in the inner shell; the inner shell is in a stepped shape, a first spring is provided on the outer periphery of the upper part of the inner shell, an inner shell sealing ring is provided on the outer periphery of the lower part of the inner shell, the inner shell is closely attached to the water supply channel through the inner shell sealing ring, and the bottom of the inner shell is tightly attached to the water supply nut screwed at the water inlet of the water supply channel under the action of the first spring; the internal discharge assembly includes a valve seat, a valve core movably penetrating through the valve seat, and an internal discharge spring provided between the valve core and the valve seat; upper and lower limit steps for axial limit are provided on the valve core; the valve seat is pressed against the bottom opening of the inner shell by a second spring.

5. The electric water heater safety valve according to claim 1, characterized in that a stepped opening is provided on the inner peripheral surface of the connection between the pressure relief channel and the small cavity, and a pressure relief water outlet is provided on the side wall of the pressure relief channel.

6. The electric water heater safety valve according to claim 5, characterized in that the pressure relief device includes: a pressure relief ejector rod, a pressure relief gasket for blocking the stepped opening is provided at one end of the pressure relief ejector rod, the other end is located outside the pressure relief channel and is connected with a pressure relief handle; a pressure relief spring is provided between the inner wall of the pressure relief channel and the pressure relief ejector rod.

7. The electric water heater safety valve according to claim 6, characterized in that A pressure relief plug is provided at one end of the pressure relief passage away from the step opening, and the pressure relief ejector rod passes through the pressure relief plug.

8. An electric water heater, comprising an electric water heater body and an inner tank provided on the electric water heater body, the inner tank is provided with a water inlet end and a water outlet end, and a safety valve is provided at the water inlet end. It is characterized in that The safety valve is the electric water heater safety valve according to any one of claims 1-7.

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