Proportional valve and gas stove

Abstract

The utility model relates to the technical field of gas appliances, and provides a proportional valve and a gas stove, and the proportional valve comprises a proportional assembly, a valve seat, a valve core, a main pipeline and a branch pipeline. A valve cavity is formed in the valve seat, the valve element is movably inserted in the valve seat, one end of the valve element is located in the valve cavity, one end of the main pipeline is located in the valve seat, the valve element is used for controlling connection and disconnection of the main pipeline and the valve cavity, the other end of the main pipeline is a gas outlet, one end of the branch pipeline is communicated with the valve cavity, and the other end of the branch pipeline is communicated with the main pipeline. And the branch pipeline and the valve cavity are in a normally communicated state. According to the proportional valve, the branch pipeline is arranged in the valve seat, one end of the branch pipeline communicates with the valve cavity, the other end of the branch pipeline communicates with the main pipeline, and the branch pipeline and the valve cavity are in a normally-communicating state. In this way, when the valve element and the main pipeline are closed, fuel gas in the valve cavity can enter the main pipeline through the branch pipeline. Therefore, the proportional valve can stably control the gas amount during soft fire by adopting relatively large current, so that the requirement of the gas stove on the soft fire is met.

Description

Technical Field

[0001] The present invention relates to the technical field of gas appliances, and in particular to a proportional valve and a gas stove. Background Art

[0002] In the related art, the gas stove controls the flame size through a proportional valve. The proportional valve is usually composed of a solenoid valve and a proportional component. The proportional valve can change the magnetic field strength generated by the solenoid coil by adjusting the current of its own solenoid coil, thereby changing the position of the valve core and the opening of the main pipeline, thereby controlling the flow of gas. However, when the user needs the gas stove to provide a smaller firepower, the opening of the proportional valve is very small at this time. When the current of the solenoid coil produces a slight fluctuation, the valve core will close with the main pipeline, causing the gas stove to turn off. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a proportional valve, which can realize small flow gas supply without being difficult to close the valve.

[0004] The application also provides a gas stove.

[0005] The proportional valve proposed in this application includes:

[0006] A proportional component, wherein a chamber is provided in the proportional component, and the chamber is connected and communicated with the gas inlet;

[0007] A valve seat, wherein a valve cavity is provided in the valve seat, and the chamber is communicated with the valve cavity;

[0008] A valve core, the valve core is movably inserted on the valve seat, and one end of the valve core is located in the valve cavity;

[0009] A main pipeline, one end of which is located in the valve seat, the valve core is used to control the connection and disconnection between the main pipeline and the valve cavity, and the other end of the main pipeline is a gas outlet;

[0010] A branch pipeline, one end of which is connected to the valve cavity, and the other end of which is connected to the main pipeline. The branch pipeline and the valve cavity are in a normally connected state, and the branch pipeline is a small circular through hole.

[0011] According to the proportional valve provided in the embodiment of the present application, a branch pipeline is arranged in the valve seat, and one end of the branch pipeline is connected to the valve cavity, and the other end is connected to the main pipeline, and the branch pipeline and the valve cavity are in a state of constant connection. In this way, when the gas stove needs to be adjusted to a low flame, the main gas passage between the valve cavity and the main pipeline can be cut off by closing the solenoid valve, and the gas in the valve cavity enters the main pipeline through the branch pipeline. This design ensures that the proportional valve can use a large current to stably control the amount of gas at a low flame, avoiding the problem of valve closure when an ordinary proportional valve needs a small current to control a low flame, and meeting the adjustment requirements of the low flame gear of the gas stove.

[0012] According to an embodiment of the present application, the branch pipeline is a flow limiting hole provided on the main pipeline, the flow limiting hole penetrates the main pipeline along the wall thickness direction of the main pipeline, and the flow limiting hole is located in the valve cavity.

[0013] According to one embodiment of the present application, the flow limiting hole includes a first hole segment and a second hole segment that are connected to each other, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, the first hole segment is connected to the main line, and the second hole segment is connected to the valve chamber.

[0014] According to one embodiment of the present application, the flow section of the main line located in the valve cavity is L-shaped and includes a first flow section and a second flow section that are interconnected, the first flow section is connected to the valve seat, the second flow section cooperates with one end of the valve core, and the flow limiting hole is provided on the first flow section.

[0015] According to one embodiment of the present application, the valve seat includes a main shell and a cover plate, the main shell defines a valve cavity with one side open, the cover plate is disposed on the main shell to seal the valve cavity, and the flow limiting hole is opposite to the cover plate.

[0016] According to one embodiment of the present application, the valve core includes:

[0017] Valve body;

[0018] A valve stem, wherein the valve stem is inserted into the valve seat, and a portion of the valve stem located outside the valve cavity is connected to the valve body, and the valve stem is movable relative to the valve seat;

[0019] A sealing gasket is arranged at the end of the valve stem and is used to seal the air inlet of the main pipeline.

[0020] According to one embodiment of the present application, a pipe joint is further included, wherein the pipe joint is located outside the valve cavity and is connected and communicated with the main pipeline.

[0021] According to one embodiment of the present application, the pipe joint is threadedly connected to the main pipe.

[0022] According to an embodiment of the present application, the main pipeline and the valve seat are an integrally formed part.

[0023] According to one embodiment of the present application, a cross-sectional area of ​​the main pipeline is greater than a cross-sectional area of ​​the branch pipeline.

[0024] The gas stove proposed in this application includes:

[0025] Proportional valve, the proportional valve is the above-mentioned proportional valve:

[0026] The burner has a nozzle, and the proportional valve is connected and communicated with the nozzle.

[0027] According to one embodiment of the present application, a cross-sectional area of ​​the branch line of the proportional valve is smaller than a cross-sectional area of ​​the nozzle.

[0028] The gas stove provided in the embodiment of the present application includes the above-mentioned proportional valve and thus also has the beneficial effects of the above-mentioned proportional valve, which will not be described in detail here.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of the proportional valve provided in this application;

[0032] Figure 2 yes Figure 1 Side view of

[0033] Figure 3 yes Figure 2 A cross-sectional view along the AA direction;

[0034] Figure 4 yes Figure 1 A top view of

[0035] Figure 5 yes Figure 4 A cross-sectional view along the CC direction, wherein the main pipeline is in an open state;

[0036] Figure 6 yes Figure 5 A local enlarged view of point A;

[0037] Figure 7 yes Figure 4 A cross-sectional view along the CC direction, wherein the main pipeline is in a closed state;

[0038] Figure 8 It is a schematic diagram of the structure of the gas stove provided by this application;

[0039] Fig. 9 This is another structural schematic diagram of the gas stove provided in this application.

[0040] Reference numerals:

[0041] 100. Gas stove;

[0042] 200, proportional valve; 201, first proportional valve; 202, second proportional valve;

[0043] 300, solenoid valve;

[0044] 310, valve seat; 311, valve chamber; 312, main housing; 313, cover plate;

[0045] 320, valve core; 321, valve body; 322, valve stem; 323, sealing gasket;

[0046] 330, main flow; 331, first flow section; 332, second flow section;

[0047] 340, flow limiting hole; 341, first hole section; 342, second hole section;

[0048] 350, pipe joint; 351, gas outlet;

[0049] 400, proportional assembly; 401, chamber; 402, gas inlet;

[0050] 500, burner; 510, outer ring fire cover; 511, outer ring nozzle; 520, inner ring fire cover; 522, inner ring nozzle; 530, first pipeline; 540, second pipeline; DETAILED DESCRIPTION

[0051] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0052] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application 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 therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0054] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean 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 "below", "below" or "below" a second feature may mean 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.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] In the related art, the gas stove controls the size of the flame through a proportional valve, which is mainly composed of a solenoid valve and a proportional component. However, when the user needs the gas stove to provide a smaller firepower, the opening of the proportional valve will become very small. In this case, if the current in the proportional valve fluctuates slightly, the valve core may close to the main line, which may cause the gas stove to flame out and affect the cooking process.

[0057] According to the following Figures 1 to 9 The proportional valve 200 provided in the embodiment of the present application is introduced.

[0058] like Figure 5 and Figure 7 As shown, a proportional valve 200 provided according to an embodiment of the present application includes a proportional component 400, a solenoid valve 300, a valve seat 310, a valve core 320, a main pipeline 330 and a branch pipeline. A chamber 401 is provided in the proportional component 400, and the chamber 401 is connected and communicated with a gas inlet 402.

[0059] A valve cavity 311 is disposed in the valve seat 310 , and the chamber 401 is communicated with the valve cavity 311 . The gas enters the chamber 401 from the gas inlet 402 , and then flows into the chamber 401 of the proportional valve 200 .

[0060] The valve core 320 is movably inserted on the valve seat 310, and one end of the valve core 320 is located in the valve cavity 311. One end of the main pipeline 330 is located in the valve seat 310, and the valve core 320 is used to control the connection and disconnection of the main pipeline 330 and the valve cavity 311. The other end of the main pipeline 330 is a gas outlet 351. One end of the branch pipeline is connected to the valve cavity 311, and the other end is connected to the main pipeline 330. The branch pipeline and the valve cavity 311 are in a normally connected state.

[0061] It is understandable that if Figure 5 and Figure 7 As shown, the valve core 320 can control the main line 330 to switch between an open state and a closed state. Figure 5 As shown in FIG. 1 , when the main pipeline 330 is in the open state, there is a gap between the valve core 320 and one end of the main pipeline 330. At this time, the gas in the valve cavity 311 can be divided into two paths, one path enters the main pipeline 330 from one end of the main pipeline 330, and the other path can enter the main pipeline 330 through the branch pipeline and finally flow out from the gas outlet 351. At this time, the gas stove 100 is in a high-power state. Figure 7 As shown, when the main line 330 is in a closed state, one end of the main line 330 is sealed against the valve core 320. At this time, the gas in the valve cavity 311 can enter the main line 330 through the branch line and finally flow out from the gas outlet 351. At this time, the gas stove 100 is in a low-fire state.

[0062] According to the proportional valve 200 provided in the present application, a branch pipeline is arranged in the valve seat 310, and one end of the branch pipeline is connected to the valve cavity 311, and the other end is connected to the main pipeline 330, and the branch pipeline and the valve cavity 311 are in a normally connected state. In this way, when the opening of the proportional valve 200 is small, and the valve core 320 and the main pipeline 330 are closed due to the weak fluctuation generated by the electromagnetic coil, the gas in the valve cavity 311 can also enter the main pipeline 330 through the branch pipeline. This design ensures that the proportional valve 200 can use a larger current to stably control the amount of gas at low fire, avoiding the problem of valve closure that is easy to occur when the ordinary proportional valve 200 needs a small current to control the low fire, and meets the adjustment requirements of the low fire gear of the gas stove 100. Figure 5 and Figure 7 As shown, in some embodiments of the present application, the branch pipeline is a flow-limiting hole 340 provided on the main pipeline 330, the flow-limiting hole 340 penetrates the main pipeline 330 along the wall thickness direction of the main pipeline 330, and the flow-limiting hole 340 is located in the valve cavity 311. The aperture of the flow-limiting hole 340 is smaller than the inner diameter of the main pipeline 330, so that when the gas stove 100 is in a low-fire state, the flow-limiting hole 340 can limit the gas flow entering the main pipeline 330 from the valve cavity 311, so as to prevent the proportional valve 200 from providing too much gas flow to the gas stove 100 when the gas stove 100 is in a low-fire state, so as to make the fire of the gas stove 100 too strong.

[0063] In some embodiments of the present application, the flow limiting hole 340 may be a circular hole. Of course, the shape of the flow limiting hole 340 is not limited thereto. In other embodiments of the present application, the flow limiting hole 340 may also be a square hole or a polygonal hole. When actually set, it may be designed according to actual needs so that the proportional valve 200 can meet different flow control requirements.

[0064] like Figure 6 As shown, in some embodiments of the present application, the flow limiting hole 340 includes a first hole section 341 and a second hole section 342 that are interconnected, the cross-sectional area of ​​the first hole section 341 is larger than the cross-sectional area of ​​the second hole section 342, the first hole section 341 is connected to the main pipeline 330, and the second hole section 342 is connected to the valve chamber 311. In this way, the gas will experience different flow rates and pressure changes when passing through the flow limiting hole 340. This design can make the proportional valve 200 more delicate and accurate in controlling the gas flow rate, and better adapt to different usage requirements. By accurately controlling the gas flow rate, safety hazards caused by excessive gas flow can be prevented, and the overall safety of the gas stove 100 can be improved.

[0065] like Figure 5 and Figure 7As shown, in some embodiments of the present application, the flow section of the main line 330 located in the valve cavity 311 is L-shaped, so that the overall equipment size of the proportional valve 200 can be reduced. The main line 330 is connected to the first flow section 331 and the second flow section 332, the first flow section 331 is connected to the valve seat 310, the second flow section 332 is matched with one end of the valve core 320, and the flow limiting hole 340 is provided on the first flow section 331. When the main line 330 is in an open state, the gas in the valve cavity 311 is divided into two paths, one of which enters the second flow section 332 from one end of the main line 330, flows through the first flow section 331, and finally flows out from the gas outlet 351. The other path flows into the second flow section 332 from the flow limiting hole 340, and finally flows out from the gas outlet 351. When the main line 330 is in a closed state, the gas in the valve cavity 311 flows into the second flow section 332 from the flow limiting hole 340, and then flows out from the gas outlet 351.

[0066] like Figure 5 and Figure 7 As shown, in some embodiments of the present application, the valve seat 310 includes a main housing 312 and a cover plate 313. The main housing 312 defines a valve cavity 311 with one side open. The cover plate 313 is covered on the main housing 312. The cover plate 313 is used to seal the valve cavity 311 to ensure the sealing of the valve cavity 311 and prevent gas leakage and external contamination of the inside of the valve cavity 311. The flow limiting hole 340 is opposite to the cover plate 313. In this way, when the flow limiting hole 340 is set on the main pipeline 330, the cover plate 313 can be opened to facilitate the setting of the flow limiting hole 340 on the inner wall of the main pipeline 330. And after opening the cover plate 313, the operator can directly view the status of the flow limiting hole 340 and related components, so as to make it easier to perform fault diagnosis and troubleshooting.

[0067] like Figure 5 As shown, in some embodiments of the present application, the valve core 320 includes a valve body 321, a valve stem 322 and a sealing gasket 323. The valve stem 322 is inserted into the valve seat 310, and the portion of the valve stem 322 located outside the valve cavity 311 is connected to the valve body 321, and the valve stem 322 is movable relative to the valve seat 310. The sealing gasket 323 is arranged at the end of the valve stem 322, and the movement of the valve stem 322 drives the sealing gasket 323 to seal or open the air inlet of the main line 330. When the sealing gasket 323 is sealed with the air inlet of the main line 330, the valve stem 322 drives the sealing gasket 323 to move, so that the sealing gasket 323 fits the air inlet. When the sealing gasket 323 opens the air inlet of the main line 330, the valve stem 322 drives the sealing gasket 323 to move in a direction away from the air inlet, and a gap is generated between the sealing gasket 323 and the air inlet of the main line 330, so that the gas in the valve cavity 311 can enter the main line 330 from the air inlet.

[0068] like Figure 4As shown, in some embodiments of the present application, the proportional valve 200 further includes a pipe joint 350. The pipe joint 350 is located outside the valve cavity 311, and the pipe joint 350 is connected and communicated with the main pipeline 330. A gas outlet 351 is provided in the pipe joint 350. In this way, when the proportional valve 200 needs to be connected to the gas stove 100, the pipe joint 350 can conveniently connect the proportional valve 200 to the pipeline in the gas stove 100.

[0069] like Figure 5 and Figure 7 As shown, in some embodiments of the present application, the pipe joint 350 can be detachably connected to the proportional valve 200. For example, in this embodiment, the pipe joint 350 can be threadedly connected to the main pipeline 330. When the pipe joint 350 is installed on the proportional valve 200, the pipe joint 350 can be directly screwed into the main pipeline 330, which is very convenient. In this way, when the proportional valve 200 needs to be connected to a gas stove with different sizes, the pipe joint 350 of different sizes can be replaced to adapt to the pipelines of gas stoves of various specifications, thereby improving the application range of the proportional valve 200.

[0070] Of course, the connection method between the pipe joint 350 and the proportional valve 200 is not limited to this. In some other embodiments of the present application, the pipe joint 350 and the valve seat 310 are integrally formed. In this way, the interface of the valve seat 310 of the proportional valve 200 is reduced, thereby reducing the potential gas leakage point and enhancing the sealing of the proportional valve 200. In addition, the integrally formed pipe joint 350 and valve seat 310 reduce the number of parts during installation and improve the overall stability and durability of the proportional valve 200. The integrated design also simplifies the assembly process, reduces assembly time and labor costs, and also reduces the complexity of the production process.

[0071] like Figure 5 and Figure 7 As shown, in some embodiments of the present application, the cross-sectional area of ​​the main pipeline 330 is greater than the cross-sectional area of ​​the branch pipeline. In this way, when the gas stove 100 is in a low-fire state, the branch pipeline can limit the gas flow entering the main pipeline 330 from the valve cavity 311, thereby preventing the proportional valve 200 from providing too much gas flow to the gas stove 100 when the gas stove 100 is in a low-fire state, thereby causing the gas stove 100 to have too much fire power.

[0072] like Figure 8 and Fig. 9 As shown, a gas stove 100 provided according to the present application includes a proportional valve 200 and a burner 500. The burner 500 has a nozzle, and the proportional valve 200 is connected and communicated with the nozzle through a pipeline.

[0073] When the burner 500 needs to provide a low-fire gear, if the cross-sectional area of ​​the nozzle is too large, it will affect the flow regulation of the gas, making it difficult for the burner 500 to reach the low-fire gear. Therefore, in some embodiments of the present application, the cross-sectional area of ​​the branch pipeline of the proportional valve 200 is smaller than the cross-sectional area of ​​the nozzle, so that when the burner 500 needs to provide a low-fire gear, the flow of the gas can be controlled through the proportional valve branch pipeline to make the burner 500 reach the low-fire state.

[0074] like Figure 8 and Fig. 9 As shown, in some embodiments of the present application, there may be two proportional valves 200 in the gas stove 100, namely, a first proportional valve 201 and a second proportional valve 202. The burner 500 has an outer ring fire cover 510 and an inner ring fire cover 520, the outer ring fire cover 510 is provided with an outer ring nozzle 511, and the inner ring fire cover 520 is provided with an outer ring nozzle 511. The first proportional valve 201 is connected to the outer ring nozzle 511 through a first pipeline 530, and the second proportional valve 202 is connected to the inner ring nozzle 522 through a second pipeline 540. Among them, the cross-sectional area of ​​the branch pipeline of the first proportional valve 201 is smaller than the cross-sectional area of ​​the outer ring nozzle 511, and the cross-sectional area of ​​the branch pipeline of the second proportional valve 202 is smaller than the cross-sectional area of ​​the inner ring nozzle 522.

[0075] In this way, by connecting the outer ring fire cover 510 to the first proportional valve 201 and the inner ring fire cover 520 to the second proportional valve 202, the inner and outer ring fires of the burner 500 can be independently adjusted. When the inner ring fire cover 520 requires low fire power, the inner ring fire cover 520 can be supplied with gas through the flow restriction hole 340 of the first proportional valve 201. When the outer ring fire cover 510 requires low fire power, the outer ring fire cover 510 can be supplied with gas through the flow restriction hole 340 of the second proportional valve 202. In this way, the flow rate linear adjustment of the fire power level of the burner 500 can be achieved.

[0076] The following takes two proportional valves 200 as an example to illustrate the working process of the proportional valve 200 when the gas stove 100 provided in the present application is working and adjusting the fire level.

[0077] When the outer ring fire cover 510 of the gas stove 100 needs a high fire, and the inner ring fire cover 520 needs a low fire, at this time, the two proportional valves need to be adjusted independently. The first proportional valve 201 is adjusted to the high fire gear. At this time, in the proportional valve 200 of the first proportional valve 201, the valve stem 322 drives the sealing gasket 323 to move in the direction away from the air inlet of the main line 330, and a gap is generated between the sealing gasket 323 and the air inlet of the main line 330. The gas in the valve cavity 311 can enter the main line 330 from the air inlet of the main line 330, and then enter the first pipeline 530 from the gas outlet 351, and finally spray out from the outer ring nozzle 511 to provide gas for the outer ring fire cover 510. At this time, the flow rate of the gas of the outer ring fire cover 510 is large, so that the firepower of the outer ring fire cover 510 can reach the high firepower gear.

[0078] The second proportional valve 202 needs to be adjusted to the low-fire position. At this time, in the second proportional valve 202, the valve stem 322 of the proportional valve 200 drives the sealing gasket 323 to move, so that the sealing gasket 323 fits and seals with the air inlet of the main pipeline 330. The gas in the valve cavity 311 enters the main pipeline 330 from the flow restriction hole 340, then enters the second pipeline 540 from the gas outlet 351, and finally sprays out from the inner ring nozzle 522 to provide gas for the inner ring nozzle 522. At this time, the gas flow rate of the inner ring fire cover 520 is small, so that the firepower of the inner ring fire cover 520 can reach the low-fire position.

[0079] According to the gas stove 100 provided in the present application, by connecting the outer ring fire cover 510 to the first proportional valve 201 and connecting the inner ring fire cover 520 to the second proportional valve 202, the inner and outer ring fires of the burner 500 can be independently adjusted, so that the fire power level of the gas stove 100 can achieve linear flow adjustment.

[0080] Finally, it should be noted that the above implementation modes are only used to illustrate the present application, rather than to limit the present application. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A proportional valve, characterized in that: include: A proportional component, wherein a chamber is provided in the proportional component, and the chamber is connected and communicated with the gas inlet; A valve seat, wherein a valve cavity is provided in the valve seat, and the chamber is communicated with the valve cavity; A valve core, the valve core is movably inserted on the valve seat, and one end of the valve core is located in the valve cavity; A main pipeline, one end of which is located in the valve seat, the valve core is used to control the connection and disconnection between the main pipeline and the valve cavity, and the other end of the main pipeline is a gas outlet; A branch pipeline, one end of which is connected to the valve cavity, and the other end of which is connected to the main pipeline, and the branch pipeline and the valve cavity are in a normally connected state.

2. The proportional valve according to claim 1, characterized in that: The branch pipeline is a flow-limiting hole provided on the main pipeline, the flow-limiting hole penetrates the main pipeline along the wall thickness direction of the main pipeline, and the flow-limiting hole is located in the valve cavity.

3. The proportional valve according to claim 2, characterized in that: The flow limiting hole includes a first hole section and a second hole section which are connected to each other, the cross-sectional area of ​​the first hole section is larger than the cross-sectional area of ​​the second hole section, the first hole section is connected to the main pipeline, and the second hole section is connected to the valve cavity.

4. The proportional valve according to claim 2, characterized in that: The flow section of the main pipeline located in the valve cavity is L-shaped and includes a first flow section and a second flow section that are interconnected, the first flow section is connected to the valve seat, the second flow section cooperates with one end of the valve core, and the flow limiting hole is arranged on the first flow section.

5. The proportional valve according to claim 2, characterized in that: The valve seat comprises a main shell and a cover plate. A valve cavity with one side open is defined in the main shell. The cover plate is disposed on the main shell to seal the valve cavity. The flow limiting hole is opposite to the cover plate.

6. The proportional valve according to claim 1, characterized in that: The valve core comprises: Valve body; A valve stem, wherein the valve stem is inserted into the valve seat, and a portion of the valve stem located outside the valve cavity is connected to the valve body, and the valve stem is movable relative to the valve seat; A sealing gasket is arranged at the end of the valve stem and is used to seal the air inlet of the main pipeline.

7. The proportional valve according to any one of claims 1 to 6, characterized in that: It also includes a pipe joint, which is located outside the valve cavity and is connected and communicated with the main pipeline.

8. The proportional valve according to claim 7, characterized in that: The pipe joint is threadedly connected to the main pipe.

9. The proportional valve according to any one of claims 1 to 6, characterized in that: The main pipe and the valve seat are integrally formed.

10. The proportional valve according to any one of claims 1 to 6, characterized in that: The cross-sectional area of ​​the main pipeline is greater than the cross-sectional area of ​​the branch pipeline.

11. A gas stove, characterized in that: include: A proportional valve, wherein the proportional valve is a proportional valve according to any one of claims 1 to 10: The burner has a nozzle, and the proportional valve is connected and communicated with the nozzle.

12. The gas stove according to claim 11, characterized in that: The cross-sectional area of ​​the branch line of the proportional valve is smaller than the cross-sectional area of ​​the nozzle.

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