Gas proportional valve and gas water heater

Abstract

The utility model relates to the technical field of gas water heaters, in particular to a gas proportional valve and a gas water heater. The gas proportional valve comprises a valve body, a sealing piece and a stop valve, a main channel and a stop valve cavity are formed in the valve body, and one end of the stop valve cavity penetrates through the valve body and forms a mounting opening. The sealing piece is installed in the stop valve cavity in a sealed mode through the installation opening and provided with a valve opening, and the main channel is communicated with the stop valve cavity through the valve opening. The stop valve is mounted at the mounting port, and a sealing cap of the stop valve is used for blocking or opening the valve port. The gas water heater comprises the gas proportional valve, the valve port is formed in the sealing piece, the sealing piece is installed in the stop valve cavity of the valve body in a sealed mode through the installation port, and the stop valve opens and closes the valve port through the sealing cap to achieve separation or communication between the main channel and the stop valve cavity. Machining operation does not need to be carried out in the valve body, the machining cost is reduced, sand holes and chippings are effectively prevented from occurring in the machining process of the valve body, and normal use of the gas water heater is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, and in particular to a gas proportional valve and a gas water heater. Background Technology

[0002] In existing gas proportional valves, the valve body contains interconnected shut-off valve chambers, main channels, and proportional valve chambers. The shut-off valve opens and closes the valve port of the main channel through a sealing cap to isolate or connect the main channel and the shut-off valve chamber. To ensure the smoothness of the sealing surface at the valve port, the die-cast valve body needs to be machined. The limited space within the valve body makes machining difficult, leading to increased processing costs. Furthermore, machining may introduce quality defects such as sand holes. Simultaneously, the large amount of debris or impurities generated during machining is difficult to clean and easily remains within the valve body, affecting the normal operation of the gas proportional valve. Utility Model Content

[0003] One of the technical problems solved by this utility model is to provide a gas proportional valve that can effectively solve the technical problems in the prior art, such as the need for machining of the valve body leading to high costs, the appearance of sand holes, and the residue of machining debris or impurities in the valve body.

[0004] The second technical problem solved by this utility model is to provide a gas water heater that can effectively solve the technical problems in the prior art, such as the need for machining of the valve body leading to high costs, the appearance of sand holes, and the residue of processing debris or impurities in the valve body.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] Gas proportional valve, including:

[0007] The valve body has a main channel and a shut-off valve chamber, one end of which passes through the valve body and forms an installation port.

[0008] A sealing element is installed in the shut-off valve cavity through the mounting port, and the sealing element has a valve port. The main channel is connected to the shut-off valve cavity through the valve port.

[0009] A shut-off valve is installed at the mounting port, and the sealing cap of the shut-off valve is used to block or open the valve port.

[0010] The gas proportional valve described in this utility model has the following advantages compared with the prior art:

[0011] By using a separate design for the valve body and the sealing element, a valve port is opened on the sealing element and sealed and installed in the stop valve cavity of the valve body through the installation port. The stop valve opens and closes the valve port through the sealing cap to achieve isolation or connection between the main channel and the stop valve cavity. This eliminates the need for machining operations in the valve body, reduces the processing cost of the valve body, effectively avoids quality defects such as sand holes during the machining of the valve body, and also avoids the residue of machining debris or impurities in the valve body, thus ensuring the normal use of the gas proportional valve.

[0012] In one embodiment, the seal includes:

[0013] A sealing ring, wherein the sealing ring has the valve port;

[0014] The sealing ring has a flange extending circumferentially along its side, and the flange is sealed and fitted against the inner wall of the shut-off valve cavity.

[0015] In one embodiment, a stepped surface is provided between the main channel and the other end of the shut-off valve cavity; the sealing ring is attached to and abuts against the stepped surface, and the flange is interference-fitted with the shut-off valve cavity.

[0016] In one embodiment, the interference fit between the flange and the inner wall of the shut-off valve cavity is 0.25 mm to 0.3 mm.

[0017] In one embodiment, the flange is bonded to the inner wall of the shut-off valve cavity by a sealant layer.

[0018] In one embodiment, the inner ring of the sealing ring protrudes to one side facing the thickness direction of the sealing ring to form a ridge, and the ridge surrounds the valve port;

[0019] The sealing cap can press against the top of the protruding ridge to seal the valve port; or, the sealing cap can disengage from the protruding ridge to open the valve port.

[0020] In one embodiment, the radial cross-section of the convex ridge is V-shaped, U-shaped, or arc-shaped.

[0021] In one embodiment, the flange and the convex ridge are located on the same side of the sealing ring in the thickness direction.

[0022] In one embodiment, the seal is made of stainless steel.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] Gas water heaters, including the aforementioned gas proportional valve.

[0025] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0026] By using a separate design for the valve body and the sealing element, a valve port is opened on the sealing element and sealed and installed in the stop valve cavity of the valve body through the installation port. The stop valve opens and closes the valve port through the sealing cap to achieve isolation or connection between the main channel and the stop valve cavity. This eliminates the need for machining operations in the valve body, reduces the processing cost of the valve body, effectively avoids quality defects such as sand holes during the machining of the valve body, and also avoids the residue of machining debris or impurities in the valve body, thus ensuring the normal use of the gas water heater. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the gas proportional valve provided in an embodiment of this utility model;

[0028] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0029] Figure 3 This is a structural schematic diagram of the sealing element provided in an embodiment of this utility model.

[0030] The component names and labels in the diagram are as follows:

[0031] 1. Valve body; 11. Main passage; 12. Shut-off valve chamber; 121. Stepped surface; 122. Mounting port; 13. Proportional valve chamber; 14. Inlet passage;

[0032] 2. Sealing element; 21. Sealing ring; 211. Valve port; 212. Raised ridge; 22. Flanged edge;

[0033] 3. Gate valve; 31. Valve stem; 32. Sealing cap; 33. Spring;

[0034] 4. Proportional valve assembly. Detailed Implementation

[0035] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] This embodiment proposes a gas water heater, which includes a combustion device and a gas proportional valve, etc. The gas proportional valve is used to control the gas flow rate supplied to the combustion chamber of the combustion device.

[0040] like Figure 1 As shown, this embodiment also proposes a gas proportional valve, which includes a valve body 1, a shut-off valve 3, and a proportional valve assembly 4. The valve body 1 has a main channel 11, a shut-off valve chamber 12, a proportional valve chamber 13, and an intake channel 14. The intake channel 14 communicates with the shut-off valve chamber 12. One end of the shut-off valve chamber 12 passes through the valve body 1 and forms an installation port 122. The other end of the shut-off valve chamber 12 communicates with one end of the main channel 11, and the other end of the main channel 11 communicates with the proportional valve chamber 13, so that the gas in the intake channel 14 passes sequentially through the shut-off valve chamber 12 and the main channel 11 before entering the proportional valve chamber 13. The shut-off valve 3 includes a shut-off valve, a sealing cap 32, and a spring 33. The shut-off valve is a solenoid valve, and one end of the valve stem 31 of the shut-off valve is connected to the sealing cap 32. The spring 33 is sleeved on the valve stem 31, and one end of the spring 33 abuts against the sealing cap 32. The shut-off valve is installed at the mounting port 122, with part of the valve stem 31 and the sealing cap 32 extending into the shut-off valve cavity 12 to block or open the main channel 11 through the sealing cap 32. The proportional valve assembly 4 includes a proportional valve and a diaphragm, etc. The proportional valve is installed on the valve body 1, and the diaphragm is installed in the proportional valve cavity 13. Since both the shut-off valve 3 and the proportional valve assembly 4 are existing technologies, their specific structures and detailed working processes will not be described in detail.

[0041] In existing gas proportional valves, to ensure the smoothness of the sealing surface at the valve port, the die-cast valve body needs to be machined, which increases processing costs and may introduce quality defects such as sand holes during machining. Furthermore, the large amount of debris or impurities generated during machining is difficult to clean and easily remains inside the valve body, affecting the normal operation of the gas proportional valve.

[0042] To solve the above problems, such as Figure 1 and Figure 2 As shown, the gas proportional valve in this embodiment also includes a sealing element 2. The sealing element 2 is sealed and installed in the shut-off valve cavity 12 through the mounting port 122. The sealing element 2 has a valve port 211, and the main channel 11 and the shut-off valve cavity 12 are connected through the valve port 211. The sealing cap 32 of the shut-off valve 3 is used to block or open the valve port 211. Through the separate design of the valve body 1 and the sealing element 2, the valve port 211 is opened on the sealing element 2 and sealed and installed in the shut-off valve cavity 12 of the valve body 1 through the mounting port 122. The shut-off valve 3 opens and closes the valve port 211 through the sealing cap 32 to realize the isolation or connection between the main channel 11 and the shut-off valve cavity 12. This eliminates the need for machining operations in the valve body 1, reduces the machining cost of the valve body 1, effectively avoids quality defects such as sand holes in the valve body 1 during machining, and also avoids the residue of machining debris or impurities in the valve body 1, so as to ensure the normal use of the gas proportional valve.

[0043] It is understood that since the seal 2 has a valve port 211, the seal 2 can be machined first and then installed in the shut-off valve cavity 12 through the installation port 211, or the seal 2 can be made of a material with a high degree of smoothness, so that there is no need to perform machining operations in the valve body 1.

[0044] In one embodiment, the seal 2 is bonded to the inner wall of the shut-off valve cavity 12 by a sealing adhesive layer.

[0045] Specifically, such as Figure 2 and Figure 3 As shown, the sealing element 2 includes a sealing ring 21 and a flange 22. The sealing ring 21 has a valve port 211. The flange 22 extends circumferentially from the side of the sealing ring 21 and is sealed against the inner wall of the shut-off valve cavity 12. By providing the flange 22, not only is the structural strength of the sealing element 2 improved, but the contact area between the sealing element 2 and the shut-off valve cavity 12 is also increased, thereby improving the sealing effect between the sealing element 2 and the shut-off valve cavity 12.

[0046] In one embodiment, a stepped surface 121 is provided between the main channel 11 and the other end of the shut-off valve chamber 12. The sealing ring 21 is fitted and abuts against the stepped surface 121, and the flange 22 is interference-fitted with the shut-off valve chamber 12. Specifically, the flange 22 is interference-fitted with the shut-off valve chamber 12 so that the sealing element 2 is press-fitted into the shut-off valve chamber 12 near the end of the main channel 11 through the mounting port 122, which improves the stability of the installation of the sealing element 2 and ensures a good sealing effect between the flange 22 and the shut-off valve chamber 12, preventing gas from leaking into the proportional valve chamber 13.

[0047] Specifically, the interference fit between the flange 22 and the inner wall of the shut-off valve cavity 12 is 0.25mm to 0.3mm. If the interference fit is too large, it will increase the difficulty of installing the seal 2. If the interference fit is too small, it will reduce the installation stability and sealing effect between the flange 22 and the shut-off valve cavity 12.

[0048] In one embodiment, the flange 22 is bonded to the inner wall of the shut-off valve cavity 12 via a sealant layer. Specifically, sealant is applied to the inner wall of the shut-off valve cavity 12, and then the sealing element 2 is press-fitted into the shut-off valve cavity 12 through the mounting port 122, thereby forming a sealant layer between the flange 22 and the inner wall of the shut-off valve cavity 12. The sealant fills any gaps that may exist between the flange 22 and the inner wall of the shut-off valve cavity 12, while simultaneously bonding the flange 22 to the shut-off valve cavity 12 via the sealant layer, improving the stability of the sealing element 2 installation and further enhancing the sealing effect between the flange 22 and the shut-off valve cavity 12. Optionally, the sealing ring 21 can also be bonded to the inner wall of the shut-off valve cavity 12 via a sealant layer.

[0049] like Figure 2 and Figure 3 As shown, the inner ring of the sealing ring 21 protrudes to form a ridge 212 on the side facing the thickness direction of the sealing ring 21, and the ridge 212 surrounds the valve port 211. The sealing cap 32 can press against the top of the ridge 212 to seal the valve port 211; or, the sealing cap 32 can disengage from the ridge 212 to open the valve port 211. The ridge 212 is integrally formed on the edge of the valve port 211 by stamping, so that when the sealing cap 32 seals the valve port 211, it abuts against the top of the ridge 212, so that the sealing cap 32 and the sealing element 2 are in line contact, thereby ensuring the sealing effect between the sealing cap 32 and the sealing element 2 and preventing air leakage.

[0050] In one embodiment, the radial cross section of the protruding rib 212 can be V-shaped, U-shaped or arc-shaped, which simplifies the structure of the protruding rib 212, reduces the processing difficulty and processing cost, and ensures that the sealing cap 32 and the top of the protruding rib 212 are always in line contact.

[0051] In one embodiment, such as Figure 2 and Figure 3As shown, the flange 22 and the ridge 212 are located on the same side of the thickness direction of the sealing ring 21, so that both the ridge 212 and the flange 22 face the mounting port 122 of the valve body 1. The sealing cap 32 extends into the interior of the flange 22 to block the valve port 211, thereby shortening the design length of the shut-off valve cavity 12 and improving the structural compactness of the gas proportional valve.

[0052] It should be noted that the material of the seal 2 in this embodiment is stainless steel. Stainless steel has a high degree of smoothness and high strength. By using stainless steel plate to prepare the seal 2, the structural strength of the seal 2 is improved and the processing difficulty of the seal 2 is reduced.

[0053] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas proportional valve, characterized in that, include: The valve body (1) has a main channel (11) and a shut-off valve chamber (12) inside. One end of the shut-off valve chamber (12) passes through the valve body (1) and forms an installation port (122). The sealing element (2) is sealed and installed in the shut-off valve cavity (12) through the mounting port (122). The sealing element (2) has a valve port (211). The main channel (11) is connected to the shut-off valve cavity (12) through the valve port (211). A shut-off valve (3) is installed at the mounting port (122), and the sealing cap (32) of the shut-off valve (3) is used to block or open the valve port (211).

2. The gas proportional valve according to claim 1, characterized in that, The seal (2) includes: A sealing ring (21) is provided with the valve port (211); The flange (22) is provided on the circumferential side of the sealing ring (21), and the flange (22) is sealed and fitted to the inner wall of the shut-off valve cavity (12).

3. The gas proportional valve according to claim 2, characterized in that, The main channel (11) has a stepped surface (121) between the other end of the shut-off valve cavity (12); the sealing ring (21) is attached to and abuts against the stepped surface (121), and the flange (22) is interference-fitted with the shut-off valve cavity (12).

4. The gas proportional valve according to claim 3, characterized in that, The interference fit between the flange (22) and the inner wall of the shut-off valve cavity (12) is 0.25mm to 0.3mm.

5. The gas proportional valve according to claim 1, characterized in that, The seal (2) is bonded to the inner wall of the shut-off valve cavity (12) by a sealing adhesive layer.

6. The gas proportional valve according to claim 2, characterized in that, The inner ring of the sealing ring (21) protrudes to one side of the sealing ring (21) in the thickness direction to form a ridge (212), and the ridge (212) surrounds the valve port (211). The sealing cap (32) can press against the top of the protrusion (212) to block the valve port (211); or, the sealing cap (32) can disengage from the protrusion (212) to open the valve port (211).

7. The gas proportional valve according to claim 6, characterized in that, The radial cross-section of the protruding ridge (212) is V-shaped, U-shaped or arc-shaped.

8. The gas proportional valve according to claim 6, characterized in that, The flange (22) and the convex ridge (212) are located on the same side of the thickness direction of the sealing ring (21).

9. The gas proportional valve according to any one of claims 1 to 8, characterized in that, The sealing element (2) is made of stainless steel.

10. A gas-fired water heater, characterized in that, The gas proportional valve includes any one of claims 1 to 9.

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