Safety relief valve for water heater

Abstract

The invention relates to the technical field of pressure relief valves, in particular to a safety pressure relief valve for a water heater, which comprises a non-return device, an isolation device, a pressure relief device and a main valve body, the pressure relief device is arranged at one end of the main valve body, and the other end of the main valve body (6) is connected with a pressure relief interface 7; a non-return device is arranged on the side, close to the pressure relief device, of the interior of the main valve body, an isolation device is arranged at the bottom, close to the non-return device, of the interior of the main valve body, the pressure relief device is used for conducting pressure relief when the pressure in the water heater is too large, and the non-return device is used for preventing water in the water heater from flowing back into the water inlet pipe. The isolating device, the non-return device and the pressure relief device are integrated in the same valve, and the number of valves in a traditional water heater pipeline is reduced, so that the pipeline does not need to be cut into multiple sections when the valve is installed, the installation steps are simplified, and the valve is easy to install.

Description

Technical Field

[0001] The invention relates to the technical field of pressure relief valves, in particular to a safety pressure relief valve for a water heater. Background Art

[0002] The water heater pressure relief valve is an important part of the water heater. It is mainly used to adjust the internal pressure of the water heater to prevent accidents caused by excessive pressure. The working principle of the water heater pressure relief valve is realized through an internal diaphragm and a spring. When the internal pressure of the water heater exceeds the design range, the internal pressure acts on the diaphragm of the pressure relief valve. When the diaphragm is deformed to a certain extent, the pressure relief valve will open, and the hot water inside the water heater will be released through the outlet of the pressure relief valve. At the same time, new water from the water supply pipe will also enter the water heater through the inlet of the pressure relief valve. When the internal pressure of the water heater drops to a safe range, the spring on the pressure relief valve will restore the diaphragm to its original state and close the pressure relief valve, thereby restoring the normal working state of the water heater.

[0003] At present, water heaters are equipped with pressure relief valves to prevent excessive pressure in the water heaters. Some water heaters are also equipped with other valves to prevent water from flowing back into the water heaters, resulting in too many valves installed in the pipelines. When installing the valves, the pipelines need to be cut into many sections, making the valve installation too troublesome. Summary of the invention

[0004] The object of the present invention is to provide a safety pressure relief valve for a water heater, which integrates an isolation device, a check device and a pressure relief device in the same valve, thereby reducing the number of valves in a traditional water heater pipeline, thereby eliminating the need to cut the pipeline into multiple sections when installing the valve, simplifying the installation steps and making the valve installation simple.

[0005] To solve the problems of the prior art, the present invention provides a safety pressure relief valve for a water heater, comprising a check device, an isolation device, a pressure relief device and a main valve body, the pressure relief device being arranged at one end of the main valve body, the other end of the main valve body being connected to a pressure relief interface, a check device being arranged on one side of the main valve body close to the pressure relief device, an isolation device being arranged on the bottom of the main valve body close to the check device, the pressure relief device being used to relieve pressure when the internal pressure of the water heater is too high, the check device being used to prevent water in the water heater from flowing back into the water inlet pipe, the isolation device being used to control the on and off of the water flow, one end of the check device being also connected to a three-way valve, and the other two interfaces of the three-way valve being connected to the water heater through pipes.

[0006] Preferably, the check valve body is vertically installed in the main valve body, and the check device includes a check valve core and a check valve body, the check valve core is slidably arranged in the check valve body, a flow channel for water circulation is opened at the bottom of the check valve body, a through hole is opened on the side of the check valve body, and the flow channel on the check valve body is connected to the through hole on the check valve body.

[0007] Preferably, a check slide rod is vertically arranged inside the check valve body, one end of the check slide rod is fixed to the top of the check valve core, and the other end of the check slide rod extends from the top of the check valve body, and a first spring is arranged between the check valve core and the check valve body, one end of the first spring is fixed to the top of the check valve core, and the other end of the first spring is fixedly connected to the top of the check valve body, and the first spring is used for resetting the check valve core to block the flow channel at the bottom of the check valve body, and a valve cap is also screwed on the main valve body through a thread.

[0008] Preferably, the isolation device includes an isolation valve body, which is vertically screwed into the main valve body through a thread, the top end of the isolation valve body is sleeved on the bottom end of the check valve body, and the junction between the check valve body and the isolation valve body is sealed with a sealing ring, and the junction between the isolation valve body and the inside of the main valve body is sealed with a sealing ring.

[0009] Preferably, the isolation device also includes a valve ball, which is rotatably arranged in the isolation valve body through an axis, and the valve ball is provided with a channel for water to flow through, the axis on the valve ball passes through the isolation valve body and extends to the outside of the main valve body and is fixed with a switch handle by bolts, and the switch handle is used for the valve ball to rotate to control the on and off of the water flow.

[0010] Preferably, the pressure relief device is vertically screwed into the main valve body through a thread, a sealing ring is provided at the junction of the pressure relief device and the main valve body, the pressure relief device includes a sealing sleeve, and the sealing sleeve is provided with a through hole for steam discharge, a through hole is provided at the bottom of the sealing sleeve, a bushing is placed on the sealing sleeve, and the bottom of the bushing is blocked in the through hole at the bottom of the sealing sleeve.

[0011] Preferably, the pressure relief device also includes a handwheel, a pull rod is slidably arranged in the handwheel, one end of the pull rod is fixedly connected to the top of the bushing, an adjusting cap is sleeved on the outside of the pull rod, a second spring is arranged between the adjusting cap and the bushing, one end of the second spring is fixedly connected to the adjusting cap, the other end of the second spring is fixedly connected to the bushing, and an external thread is arranged on the outside of the adjusting cap.

[0012] Preferably, a threaded sleeve is fixed inside the handwheel, and an internal thread is arranged inside the threaded sleeve. The internal thread is meshed with the external thread of the adjusting cap. The handwheel is rotated to move the adjusting cap up and down, thereby adjusting the preset opening pressure of the pressure relief device.

[0013] Preferably, the three-way valve also includes a valve core body that is movably arranged inside, and a groove for inserting a screwdriver is installed in the valve core body. The groove on the valve core body of the three-way valve is also covered with a protective cap. When the opening degree of the three-way valve needs to be adjusted, the protective cap is removed, and a screwdriver is inserted into the groove in the valve core body and rotated to adjust the opening degree of the three-way valve.

[0014] Preferably, a water inlet is provided at the bottom of the main valve body, an external thread is opened on the outside of the water inlet, a pressure gauge interface is provided on the main valve body near the water inlet, a plug is inserted into the pressure gauge interface, and the pressure gauge interface reserved on the main valve body is used for the subsequent installation of the pressure gauge.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the safety pressure relief valve for the water heater has a reasonable structure and has the following advantages:

[0016] By providing a check valve core, a check slide rod, a first spring, a check valve body, an isolation device, a pressure relief device, a main valve body and a three-way valve, the pressure relief function and the check function are combined to achieve multiple functions in one valve. At the same time, the number of valves installed in the pipeline is reduced, the installation steps are reduced, and the valve installation is simple. Therefore, when water enters from the water inlet, it flows into the water heater from the three-way valve. The rotation of the valve ball can be controlled by turning the switch handle, and then the flow of water can be controlled. When water flows into the water heater, the water pushes the check valve core upward, so that water can enter the water heater. When the water does not flow, the check valve core moves downward under the action of the first spring, so that the hot water will not flow back. When the pressure in the water heater is too high, the excess pressure can be discharged from the pressure relief device. This valve integrates the functions of pressure relief, check and isolation, which can reduce the number of valves installed in the pipeline and make the valve installation simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the cross-sectional structure of a safety pressure relief valve for a water heater.

[0018] Figure 2 The present invention is a schematic diagram of the cross-sectional structure at AA of a safety pressure relief valve for a water heater.

[0019] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a safety pressure relief valve for a water heater when the isolation device is opened.

[0020] The numbers in the figure are: 1. Valve bonnet; 2. Check device; 21. Check valve core; 22. Check slide rod; 23. First spring; 24. Check valve body; 3. Isolation device; 31. Switch handle; 32. Channel; 33. Valve ball; 34. Isolation valve body; 4. Water inlet; 5. Pressure relief device; 51. Handwheel; 52. Threaded sleeve; 53. Adjustment cap; 54. Pull rod; 55. Second spring; 56. Bushing; 57. Sealing sleeve; 6. Main valve body; 7. Pressure relief interface; 8. Three-way valve; 81. Valve core body; 82. Protective cap; 9. Pressure gauge interface. DETAILED DESCRIPTION

[0021] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1-Figure 3 As shown, the present invention provides: a safety pressure relief valve for a water heater, comprising a check device 2, an isolation device 3, a pressure relief device 5 and a main valve body 6. The main valve body 6 is the main structure of the entire safety pressure relief valve, and it provides a solid frame to support and accommodate all other components. The main valve body 6 is designed with a specific flow channel inside to ensure that the water flow can flow along a predetermined path, and also provides space for installing and fixing other components. The main valve body 6 guides the water flow to pass smoothly during the heating process through its complex flow channel design, and releases pressure or prevents backflow through a specific flow channel when necessary. Its material is usually corrosion-resistant and high-temperature-resistant. The pressure relief device 5 is arranged at one end of the main valve body 6. The other end of the main valve body 6 is connected to a pressure relief interface 7. A check device 2 is arranged on one side of the main valve body 6 near the pressure relief device 5. An isolation device 3 is arranged on the bottom of the main valve body 6 near the check device 2. The check device 2 usually adopts the design principle of a one-way valve. When the water flows normally to the water heater, it allows the water to pass through; and when the water tries to flow in the opposite direction, it prevents the water from flowing back. The pressure relief device 5 is used to relieve pressure when the internal pressure of the water heater is too high. The check device 2 is used to prevent the water in the water heater from flowing back into the water inlet pipe. The isolation device 3 is used to control the on and off of the water flow. The isolation device 3 usually includes a manual valve, which changes the state of the valve by rotating. When the valve is closed, it will tightly seal the flow channel and prevent the water from passing through; when the valve is opened, it allows the water to pass smoothly.

[0023] The check valve body 24 is vertically installed in the main valve body 6. The check valve body 24 is made of high-quality corrosion-resistant materials, such as stainless steel or brass, to ensure long-term reliability and durability. The check device 2 includes a check valve core 21 and a check valve body 24. The check valve core 21 is slidably set in the check valve body 24. The check valve core 21 is usually made of a light but strong material, such as nylon or reinforced plastic, to reduce the force required for water flow to push and increase wear resistance. The bottom of the check valve core 21 is designed to be a sealing surface that fits tightly with the flow channel to ensure that the water flow can be completely blocked in the closed state. A flow channel for water circulation is provided at the bottom of the check valve body 24, and a through hole is provided on the side of the check valve body 24. The flow channel on the check valve body 24 is connected to the through hole on the check valve body 24. A check slide bar 22 is vertically arranged inside the check valve body 24, one end of the check slide bar 22 is fixed to the top of the check valve core 21, and the other end of the check slide bar 22 extends from the top of the check valve body 24. The function of the check slide bar 22 is to transmit the movement of the check valve core 21 and provide a stable guide for it. A first spring 23 is arranged between the check valve core 21 and the check valve body 24, one end of the first spring 23 is fixed to the top of the check valve core 21, and the other end of the first spring 23 is fixedly connected to the top of the check valve body 24. The first spring 23 is used for resetting the check valve core 21 to block the flow channel at the bottom of the check valve body 24. A valve cap 1 is also screwed on the main valve body 6 through a thread, and the valve cap 1 plays a role in sealing and protecting internal components. At the same time, the valve cap 1 may also be used to provide a convenient disassembly method for adjusting or repairing the check device 2. When the water flow direction is normal, the check valve core 21 is pushed open by the water flow, allowing the water flow to pass; when the water flow attempts to flow in the opposite direction, the check valve core 21 will reset under the action of the first spring 23, blocking the flow channel and preventing backflow.

[0024] After water enters from the water inlet 4, it flows into the water heater from the water outlet 8. By turning the switch handle 31, the valve ball 33 can be controlled to rotate, thereby controlling the flow of water. When water flows into the water heater, the water pushes the check valve core 21 upward, so that water can enter the water heater. When the water does not flow, the check valve core 21 moves downward under the action of the first spring 23, so that the hot water will not flow back. When the pressure in the water heater is too high, the excess pressure can be discharged from the pressure relief device 5. This valve integrates the functions of pressure relief, check and isolation, which can reduce the number of valves installed in the pipeline and make the valve installation simple.

[0025] The isolation device 3 includes an isolation valve body 34, which is vertically screwed into the main valve body 6 through a thread, and the top end of the isolation valve body 34 is sleeved on the bottom end of the check valve body 24, and the junction between the check valve body 24 and the isolation valve body 34 is sealed with a sealing ring, which is usually made of water-resistant and pressure-resistant materials, and can maintain a sealing effect for a long time to prevent water from leaking from the connection. The junction between the isolation valve body 34 and the inside of the main valve body 6 is sealed with a sealing ring, and the isolation device 3 also includes a valve ball 33, which is set in the isolation valve body 34 through shaft rotation, and the valve ball 33 is provided with a channel 32 for water flow to pass through. The valve ball 33 is a key component for controlling the interruption of water flow, and is set in the isolation valve body 34 through shaft rotation. The channel 32 opened on the valve ball 33 allows water to flow through at a specific angle. When the valve ball 33 rotates to a certain position, the channel 32 is aligned with the flow channel in the isolation valve body 34, and the water can flow through; when the valve ball 33 rotates to another position, the channel 32 is blocked by the wall of the isolation valve body 34, and the water flow is cut off. The shaft on the valve ball 33 passes through the isolation valve body 34 and extends to the outside of the main valve body 6 and is fixed with a switch handle 31 by bolts. The switch handle 31 is used for the valve ball 33 to rotate to control the on and off of the water flow.

[0026] The pressure relief device 5 is screwed vertically onto the main valve body 6 through a thread. A sealing ring is provided at the junction of the pressure relief device 5 and the main valve body 6. The pressure relief device 5 includes a sealing sleeve 57, and the sealing sleeve 57 is provided with a through hole for steam discharge. When the internal pressure of the water heater exceeds the set value, the excess steam or water will be released to the outside through these through holes, thereby protecting the water heater from damage due to excessive pressure. The design of the sealing sleeve 57 also takes sealing performance into consideration to prevent leakage when the pressure is not released. A through hole is provided at the bottom of the sealing sleeve 57, and a bushing 56 is placed on the sealing sleeve 57. The bottom of the bushing 56 is blocked in the through hole at the bottom of the sealing sleeve 57.

[0027] In this embodiment, when the internal pressure of the water heater rises to a value exceeding the set value due to heating or other reasons, excess steam or water will accumulate inside the sealing sleeve 57. As the pressure continues to increase, the steam or water will push the bushing 56 to move slightly upward and quickly be discharged to the outside through the through hole opened on the sealing sleeve 57. In this way, the pressure inside the water heater is released in time, avoiding the danger caused by excessive pressure.

[0028] The pressure relief device 5 also includes a handwheel 51, in which a pull rod 54 is slidably arranged, one end of the pull rod 54 is fixedly connected to the top of the bushing 56, an adjusting cap 53 is sleeved on the outside of the pull rod 54, a second spring 55 is arranged between the adjusting cap 53 and the bushing 56, one end of the second spring 55 is fixedly connected to the adjusting cap 53, the other end of the second spring 55 is fixedly connected to the bushing 56, an external thread is arranged on the outside of the adjusting cap 53, a threaded sleeve 52 is also fixed inside the handwheel 51, an internal thread is arranged inside the threaded sleeve 52, the internal thread is meshed with the external thread of the adjusting cap 53, the handwheel 51 is rotated to move the adjusting cap 53 up and down, and then the preset opening pressure of the pressure relief device 5 is adjusted.

[0029] In this embodiment, the threaded sleeve 52 is rotated by rotating the hand wheel 51. Since the threaded sleeve 52 is connected to the adjusting cap 53 by threads, the adjusting cap 53 can move up and down to adjust the distance between the adjusting cap 53 and the bushing 56, thereby adjusting the elastic force of the second spring 55 and adjusting the preset pressure of the pressure relief device 5.

[0030] One end of the check device 2 is also connected to a three-way valve 8, and the other two interfaces of the three-way valve 8 are connected to the water heater through pipes. The three-way valve 8 also includes a valve core body 81 that is arranged inside and can be moved. The valve core body 81 is installed with a groove for inserting a screwdriver. The groove on the valve core body 81 of the three-way valve 8 is also covered with a protective cap 82. When it is necessary to adjust the opening degree of the three-way valve 8, the protective cap 82 is removed, and a screwdriver is inserted into the groove in the valve core body 81 and rotated to adjust the opening degree of the three-way valve 8. A water inlet 4 is arranged at the bottom of the main valve body 6, and an external thread is opened on the outside of the water inlet 4. A pressure gauge interface 9 is arranged on the main valve body 6 near the water inlet 4, and a plug is inserted into the pressure gauge interface 9. The pressure gauge interface 9 reserved on the main valve body 6 is used for subsequent installation of a pressure gauge.

[0031] Working principle: when in use, the water inlet 4 is connected to the water inlet pipe, and the other two interfaces of the three-way valve 8 are connected to the water heater through the pipeline, and the pressure relief interface 7 is connected to the drain pipe. When in use, by turning the switch handle 31, the switch handle 31 rotates the valve ball 33 to open the valve, so that after water enters from the water inlet 4, the water flow pushes the check valve core 21 upward, and the water flows into the three-way valve 8 through the check valve body 24, and then the water flows into the water heater. When the water does not flow, the check valve core 21 moves downward under the action of the first spring 23, and the check valve core 21 then blocks the flow channel at the bottom of the check valve body 24, so that the water It will not flow into the water inlet pipe. If the pressure in the water heater is too high, excess water or steam will enter the main valve body 6 to push the sleeve 56 upward, and the steam or excess water will be discharged from the through hole on the sealing sleeve 57 from the pressure relief interface 7. The threaded sleeve 52 is rotated by rotating the handwheel 51. Since the threaded sleeve 52 is connected to the adjusting cap 53 by threads, the adjusting cap 53 can move up and down to adjust the distance between the adjusting cap 53 and the sleeve 56, and then adjust the elastic force of the second spring 55 to adjust the preset pressure of the pressure relief device 5. Only when the steam or water reaches the preset pressure of the pressure relief device 5, the sleeve 56 will be pushed open to relieve the pressure.

[0032] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A safety pressure relief valve for a water heater, characterized in that: The invention comprises a check device (2), an isolating device (3), a pressure relief device (5) and a main valve body (6); the pressure relief device (5) is arranged at one end of the main valve body (6); the other end of the main valve body (6) is connected to a pressure relief interface (7); a check device (2) is arranged on one side of the main valve body (6) close to the pressure relief device (5); an isolating device (3) is arranged on the bottom of the main valve body (6) close to the check device (2); the pressure relief device (5) is used to relieve pressure when the pressure inside the water heater is too high; the check device (2) is used to prevent water in the water heater from flowing back into the water inlet pipe; the isolating device (3) is used to control the on and off of the water flow; one end of the check device (2) is also connected to a three-way valve (8); the other two interfaces of the three-way valve (8) are connected to the water heater through pipelines.

2. A safety pressure relief valve for a water heater according to claim 1, characterized in that: The check valve body (24) is vertically installed in the main valve body (6), and the check device (2) comprises a check valve core (21) and a check valve body (24). The check valve core (21) is slidably arranged in the check valve body (24), a flow channel for water circulation is provided at the bottom of the check valve body (24), a through hole is provided on the side of the check valve body (24), and the flow channel on the check valve body (24) and the through hole on the check valve body (24) are connected to each other.

3. A safety pressure relief valve for a water heater according to claim 2, characterized in that: A check slide bar (22) is vertically arranged inside the check valve body (24), one end of the check slide bar (22) is fixed to the top of the check valve core (21), and the other end of the check slide bar (22) extends from the top of the check valve body (24). A first spring (23) is arranged between the check valve core (21) and the check valve body (24), one end of the first spring (23) is fixed to the top of the check valve core (21), and the other end of the first spring (23) is fixedly connected to the top of the check valve body (24). The first spring (23) is used for resetting the check valve core (21) to block the flow channel at the bottom of the check valve body (24). A valve cap (1) is also screwed onto the main valve body (6) through a thread.

4. A safety pressure relief valve for a water heater according to claim 1, characterized in that: The isolation device (3) comprises an isolation valve body (34), the isolation valve body (34) is vertically screwed into the main valve body (6) through a thread, the top end of the isolation valve body (34) is sleeved on the bottom end of the check valve body (24), and the junction between the check valve body (24) and the isolation valve body (34) is sealed by a sealing ring, and the junction between the isolation valve body (34) and the inside of the main valve body (6) is sealed by a sealing ring.

5. A safety pressure relief valve for a water heater according to claim 4, characterized in that: The isolation device (3) further comprises a valve ball (33), the valve ball (33) being rotatably arranged in the isolation valve body (34), and the valve ball (33) being provided with a channel (32) for water flow to pass through, the axis on the valve ball (33) passing through the isolation valve body (34) and extending to the outside of the main valve body (6) and being fixed with a switch handle (31) by bolts, the switch handle (31) being used for the valve ball (33) to rotate and control the on and off of the water flow.

6. A safety pressure relief valve for a water heater according to claim 1, characterized in that: The pressure relief device (5) is vertically screwed onto the main valve body (6) through a thread, a sealing ring is provided at the junction of the pressure relief device (5) and the main valve body (6), the pressure relief device (5) comprises a sealing sleeve (57), and a through hole for steam discharge is provided on the sealing sleeve (57), a through hole is provided at the bottom of the sealing sleeve (57), a bushing (56) is placed on the sealing sleeve (57), and the bottom of the bushing (56) is blocked in the through hole at the bottom of the sealing sleeve (57).

7. A safety pressure relief valve for a water heater according to claim 6, characterized in that: The pressure relief device (5) also includes a hand wheel (51), a pull rod (54) is slidably arranged in the hand wheel (51), one end of the pull rod (54) is fixedly connected to the top of the bushing (56), an adjusting cap (53) is sleeved on the outside of the pull rod (54), a second spring (55) is arranged between the adjusting cap (53) and the bushing (56), one end of the second spring (55) is fixedly connected to the adjusting cap (53), and the other end of the second spring (55) is fixedly connected to the bushing (56), and the outside of the adjusting cap (53) is provided with an external thread.

8. A safety pressure relief valve for a water heater according to claim 7, characterized in that: A threaded sleeve (52) is also fixed inside the hand wheel (51), and an internal thread is arranged inside the threaded sleeve (52). The internal thread and the external thread of the adjusting cap (53) are meshed with each other. The hand wheel (51) is rotated to move the adjusting cap (53) up and down, thereby adjusting the preset opening pressure of the pressure relief device (5).

9. A safety pressure relief valve for a water heater according to claim 1, characterized in that: The three-way valve (8) further comprises a valve core body (81) which is arranged movably inside, and a groove for inserting a screwdriver is installed in the valve core body (81). The groove on the valve core body (81) of the three-way valve (8) is also covered with a protective cap (82). When it is necessary to adjust the opening degree of the three-way valve (8), the protective cap (82) is removed, and a screwdriver is inserted into the groove in the valve core body (81) and rotated to adjust the opening degree of the three-way valve (8).

10. A safety pressure relief valve for a water heater according to claim 1, characterized in that: A water inlet (4) is provided at the bottom of the main valve body (6), and an external thread is provided on the outside of the water inlet (4). A pressure gauge interface (9) is provided on the main valve body (6) near the water inlet (4), and a plug is inserted into the pressure gauge interface (9). The pressure gauge interface (9) reserved on the main valve body (6) is used for the subsequent installation of a pressure gauge.

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