A slow closing bypass valve

Abstract

The utility model belongs to valve structure technical field, especially point to a slow -closing bypass valve, including the valve body with valve cavity, be provided with tympanic membrane in valve cavity, this tympanic membrane will inside and outside of valve cavity divide into drive chamber and flow chamber, be provided with water inlet channel and water outlet channel with flow chamber intercommunication on the valve body, drive chamber has the valve stem of axial sliding connection in, the inner end of valve stem leans on the corresponding end face of tympanic membrane, the outer end extends drive chamber beyond to the water outlet channel, be provided with reset member in drive chamber, and when the tympanic membrane pushes the valve stem and overcomes the elastic force of reset member and moves to the extreme value outward, the outer end of valve stem blocks the water outlet channel. The utility model has the advantages of simple structure, reasonable design and low cost, can be applied in water heater, through the high temperature water of heat absorbing pipe, the low temperature water of heat absorbing pipe is communicated respectively with water inlet channel and water outlet channel, when shutdown, water inlet channel and water outlet channel can be communicated automatically, thereby avoiding the problem of water temperature overheating.

Description

Technical Field

[0001] This utility model belongs to the field of valve structure technology, and specifically refers to a slow-closing bypass valve. Background Technology

[0002] During normal operation, the high-temperature flue gas generated by the combustion of a water heater is transferred to the water inside the heat-absorbing tubes through the heat-absorbing fins and tubes, thus heating the water. When the water heater is turned off, although the burner stops working, the heat-absorbing fins and tubes themselves have a high heat capacity due to their metal material. The residual heat inside, along with any remaining high-temperature flue gas, can cause the water temperature inside the heat-absorbing tubes to continue to rise for a short period, resulting in what is known as residual heat or overheating.

[0003] At this point, because the outlet valve is closed and no water is flowing out, the water trapped inside the heat absorber tube stagnates due to lack of flow. Simultaneously, it is continuously heated by the accumulating residual heat, causing its temperature to rise rapidly, potentially exceeding the safety threshold the heat absorber tube can withstand. This situation can easily lead to localized vaporization of the hot water, creating steam pressure surges and triggering water hammer in the piping system, producing severe noise and vibration, and in severe cases, even damaging components. Furthermore, since the hot water inside the heat absorber tube has exceeded the safety threshold, reopening the outlet valve could easily scald the user, seriously affecting their daily comfort and safety. Summary of the Invention

[0004] The purpose of this invention is to provide a slow-closing bypass valve that can be used in water heaters. It connects the inlet and outlet water channels to the high-temperature water and low-temperature water of the heat absorption tube, respectively. When the system is shut down, the inlet and outlet water channels can automatically connect, thereby preventing the water from overheating.

[0005] This utility model is implemented as follows: A slow-closing bypass valve includes a valve body with a valve cavity. The valve cavity is provided with a diaphragm that can deform axially under water pressure difference. The diaphragm divides the valve cavity into a drive cavity and a flow cavity. The valve body has an inlet channel and an outlet channel communicating with the flow cavity. A valve stem is axially slidably connected in the drive cavity. The inner end of the valve stem abuts against the corresponding end face of the diaphragm, and the outer end extends out of the drive cavity into the outlet channel. The drive cavity is provided with a reset element that has elasticity to push the valve stem towards the diaphragm. When the diaphragm pushes the valve stem outward to the extreme value against the elasticity of the reset element, the outer end of the valve stem blocks the outlet channel.

[0006] In the aforementioned slow-closing bypass valve, the valve body includes a valve seat and a valve cover, which are joined together to form the valve cavity. The diaphragm is located between the valve seat and the valve cover, and the valve seat and the valve cover clamp and fix the outer edge of the diaphragm from both sides. The water inlet channel is opened on the valve cover, and the water outlet channel is opened on the valve seat.

[0007] In the aforementioned slow-closing bypass valve, the inner end face of the valve stem is provided with a valve plate whose outer diameter is larger than that of the valve stem. The reset element is a compression spring fitted on the valve stem. One end of the compression spring abuts against the wall of the drive cavity, and the other end abuts against the corresponding end face of the valve plate. The other end face of the valve plate abuts against the diaphragm.

[0008] In the aforementioned slow-closing bypass valve, an annular positioning groove is provided on the wall of the drive chamber, and the corresponding end of the compression spring is inserted into the annular positioning groove.

[0009] In the aforementioned slow-closing bypass valve, a water pressure channel communicating with the water outlet channel is provided on the drive chamber, and the port of the water pressure channel communicating with the water outlet channel is located on the outer end of the valve stem near the outer port of the water outlet channel.

[0010] In the aforementioned slow-closing bypass valve, a sliding hole for axial sliding of the valve stem is provided on the wall of the drive chamber. The port where the sliding hole communicates with the drive chamber is flared outward to form a flared groove, and a dynamic seal is provided between the flared groove and the valve stem.

[0011] The outstanding advantages of this utility model compared to the prior art are: This utility model has a simple structure, reasonable design, and low cost. It can be applied to water heaters. By connecting the inlet and outlet water channels to the high-temperature water and low-temperature water of the heat absorption tube, respectively, the inlet and outlet water channels can automatically connect when the machine is stopped, thereby avoiding the problem of overheating. Attached Figure Description

[0012] Figure 1 This is a three-dimensional view of the entire utility model; Figure 2 This is an overall sectional view of the present invention.

[0013] In the diagram: 1. Valve body; 2. Diaphragm; 3. Drive chamber; 4. Flow chamber; 5. Inlet channel; 6. Outlet channel; 7. Valve stem; 8. Valve seat; 9. Valve cover; 10. Valve plate; 11. Compression spring; 12. Annular positioning groove; 13. Water pressure channel; 14. Flaring groove. Detailed Implementation

[0014] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —2: A slow-closing bypass valve includes a valve body 1 with a valve cavity. A diaphragm 2 capable of axial deformation under water pressure differential is provided in the valve cavity. The diaphragm 2 divides the valve cavity into a drive cavity 3 and a flow cavity 4. The valve body 1 has an inlet channel 5 and an outlet channel 6 communicating with the flow cavity 4. A valve stem 7 is axially slidably connected in the drive cavity 3. The inner end of the valve stem 7 abuts against the corresponding end face of the diaphragm 2, and the outer end extends out of the drive cavity 3 into the outlet channel 6. A reset member with elasticity is provided in the drive cavity 3, which can push the valve stem 7 towards the diaphragm 2. When the diaphragm 2 pushes the valve stem 7 to move outward against the elasticity of the reset member to the extreme value, the outer end of the valve stem 7 blocks the outlet channel 6.

[0015] This invention can be applied to water heaters. By connecting the inlet channel 5 and the outlet channel 6 to the high-temperature water and low-temperature water of the heat absorption tube, respectively, when the water heater is working normally, the outlet valve opens and the delivery pump generates water pressure, allowing the water pressure at the inlet channel 5 to drive the valve stem 7 outward through the diaphragm 2 until the outer end of the valve stem 7 blocks the outlet channel 6. At this time, the inlet channel 5 and the outlet channel 6 are not connected. When the water heater and the delivery pump stop, the water pressure at the inlet channel 5 decreases. Under the elastic force of the reset component, the valve stem 7 drives the diaphragm 2 to move towards the inlet channel 5, so that the inner end of the valve stem 7 no longer blocks the outlet channel 6. Thus, the inlet channel 5 and the outlet channel 6 can connect automatically, avoiding the problem of overheating of the water in the water suction pipe inside the water heater.

[0016] Furthermore, to facilitate the installation of the diaphragm 2 and the processing of the valve cavity, inlet channel 5, and outlet channel 6 within the valve body 1, the valve body 1 includes a valve seat 8 and a valve cover 9. The valve seat 8 and the valve cover 9 are joined together to form the valve cavity. The diaphragm 2 is located between the valve seat 8 and the valve cover 9, and the valve seat 8 and the valve cover 9 clamp and fix the outer edge of the diaphragm 2 from both sides. The inlet channel 5 is opened on the valve cover 9, and the outlet channel 6 is opened on the valve seat 8.

[0017] In order to enable the spring force of the reset member to act effectively on the valve stem 7 so that the valve stem 7 can move stably towards the diaphragm 2, the inner end face of the valve stem 7 is provided with a valve plate 10 with an outer diameter larger than the valve stem 7. The reset member is a compression spring 11 fitted on the valve stem 7. One end of the compression spring 11 abuts against the wall of the drive cavity 3, and the other end abuts against the corresponding end face of the valve plate 10. The other end face of the valve plate 10 abuts against the diaphragm 2.

[0018] Furthermore, in this embodiment, the specific positioning and assembly structure of the compression spring 11 is as follows: an annular positioning groove 12 is provided on the wall of the drive cavity 3, and the corresponding end of the compression spring 11 is inserted into the annular positioning groove 12.

[0019] Considering that relying solely on the elasticity of the reset component as the predetermined pressure not only places high demands on the reset component but also makes it impossible to accurately compare the water pressure at the outlet channel 6, a water pressure channel 13 is provided on the drive cavity 3 to communicate with the outlet channel 6, and the port of the water pressure channel 13 communicating with the outlet channel 6 is located at the outer end of the valve stem 7 near the outer port of the outlet channel 6.

[0020] Meanwhile, in order to prevent the water in the drive cavity 3 from entering the flow cavity 4 from the outlet channel 6 along the valve stem 7, a matching sliding hole is provided on the wall of the drive cavity 3 for the valve stem 7 to slide axially. The port of the matching sliding hole communicating with the drive cavity 3 is flared outward to form a flared groove 14, and a dynamic sealing element is provided between the flared groove 14 and the valve stem 7.

[0021] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A slow-closing bypass valve, characterized in that: The valve body (1) includes a valve cavity, in which a diaphragm (2) capable of axial deformation under water pressure difference is provided. The diaphragm (2) divides the inside and outside of the valve cavity into a drive cavity (3) and a flow cavity (4). The valve body (1) is provided with an inlet channel (5) and an outlet channel (6) communicating with the flow cavity (4). A valve stem (7) is axially slidably connected in the drive cavity (3). The inner end of the valve stem (7) abuts against the corresponding end face of the diaphragm (2), and the outer end extends out of the drive cavity (3) into the outlet channel (6). A reset member is provided in the drive cavity (3) with elasticity that can push the valve stem (7) to move toward the diaphragm (2). When the diaphragm (2) pushes the valve stem (7) to move outward to the extreme value against the elasticity of the reset member, the outer end of the valve stem (7) blocks the outlet channel (6).

2. The slow-closing bypass valve according to claim 1, characterized in that: The valve body (1) includes a valve seat (8) and a valve cover (9). The valve seat (8) and the valve cover (9) are joined together to form the valve cavity. The diaphragm (2) is located between the valve seat (8) and the valve cover (9), and the valve seat (8) and the valve cover (9) clamp and fix the outer edge of the diaphragm (2) from left to right. The water inlet channel (5) is opened on the valve cover (9), and the water outlet channel (6) is opened on the valve seat (8).

3. A slow-closing bypass valve according to claim 1 or 2, characterized in that: The inner end face of the valve stem (7) is provided with a valve plate (10) with an outer diameter larger than that of the valve stem (7). The reset component is a compression spring (11) fitted on the valve stem (7). One end of the compression spring (11) abuts against the wall of the drive cavity (3), and the other end abuts against the corresponding end face of the valve plate (10). The other end face of the valve plate (10) abuts against the diaphragm (2).

4. A slow-closing bypass valve according to claim 3, characterized in that: The drive cavity (3) has an annular positioning groove (12) on its wall surface, and the corresponding end of the compression spring (11) is inserted into the annular positioning groove (12).

5. A slow-closing bypass valve according to claim 1 or 2, characterized in that: The drive cavity (3) is provided with a water pressure channel (13) that communicates with the water outlet channel (6), and the port of the water pressure channel (13) that communicates with the water outlet channel (6) is located on the outer end of the valve stem (7) near the outer port of the water outlet channel (6).

6. A slow-closing bypass valve according to claim 5, characterized in that: The drive cavity (3) has a sliding hole for the valve stem (7) to slide axially. The port of the sliding hole that connects with the drive cavity (3) is flared outward to form a flared groove (14). A dynamic seal is provided between the flared groove (14) and the valve stem (7).

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