Gas valve

Abstract

The application discloses a gas valve, which comprises a valve body provided with an air inlet and an air outlet, and a pressure regulating device, wherein the pressure regulating device is located in the valve body and is close to the air outlet; the pressure regulating device comprises a damper and an adjusting rod; the damper is provided with a damper baffle and a fan blade; the damper baffle is limitingly connected with the valve body; the damper baffle is provided with an air port corresponding to the fan blade; the adjusting rod is threadedly connected with the valve body and can move relative to the valve body; the fan blade is connected with the adjusting rod; and the adjusting rod can drive the fan blade to move relative to the air port so as to regulate the flow capacity of the air port. The gas valve can realize the regulation of different output powers without changing the air signal wave rate, thereby meeting the switching requirement of different machine types.

Description

Technical Field

[0001] This invention relates to the field of gas control technology, and in particular to a gas valve. Background Technology

[0002] Currently, the fully premixed gas control proportional valves on the market mainly rely on the positive and negative pressure generated by the fan to act on the diaphragm of the valve body pressure regulating valve, thereby controlling the gas pressure at the valve body outlet and meeting the output power requirements of the whole machine.

[0003] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a typical fully premixed gas-controlled proportional valve.

[0004] As shown in the figure, the fully premixed gas-controlled proportional valve mainly consists of a main valve body 1′, a solenoid valve 2′, a differential pressure valve 3′, and a pressure regulating valve 5′. The pressure regulating valve 5′ has a diaphragm positive cavity 401′ and a diaphragm back cavity 402′. The diaphragm positive cavity 401′ is connected to the air signal pipe 6′, and the diaphragm back cavity 402′ is connected to the gas outlet pipe 9′. The air signal pipe 6′ and the gas outlet pipe 9′ are respectively connected to the gas path composed of the fan 10′ and the venturi tube 11′.

[0005] This structure relies on a variable frequency DC fan to generate air pressure. Under the same power fan and control program, it cannot meet the requirements for switching between different unit power. When switching between different power models, the fan power needs to be changed or the program needs to be rewritten, which is cumbersome, has poor versatility, and is quite inconvenient. Summary of the Invention

[0006] The purpose of this invention is to provide a gas valve. This gas valve can adjust the output power of different models without changing the air signal frequency, thereby meeting the needs of switching between different models.

[0007] To achieve the above objectives, the present invention provides a gas valve, including a valve body having an inlet and an outlet, and a pressure regulating device located within the valve body and close to the outlet. The pressure regulating device includes a damper and an adjusting rod. The damper has a baffle and a fan blade. The baffle is limitedly connected to the valve body and has an air opening corresponding to the fan blade. The adjusting rod is threadedly engaged with the valve body and can move relative to the valve body. The fan blade is connected to the adjusting rod, and the adjusting rod can drive the fan blade to move relative to the air opening to regulate the airflow at the air opening.

[0008] The gas valve provided by this invention, when the adjusting rod moves, can drive the damper blades to move together, causing the blades to open and close relative to the air outlet. This controls the damper opening size, achieving gas / air ratio adjustment. Thus, without changing the air signal waveform, the gas outlet pressure curve can be adjusted, ultimately achieving different output power. Since it does not require modification of the valve body outlet size, fan power, or control program, only a simple adjustment of the adjusting rod position is needed to meet the requirements of switching between different models. Therefore, it has advantages such as strong versatility and ease of use. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a typical fully premixed gas-controlled proportional valve.

[0010] Figure 2 This is a schematic diagram of the structure of a pneumatically controlled proportional gas valve provided in an embodiment of the present invention;

[0011] Figure 3 for Figure 2 A schematic diagram showing the connection between the damper and the regulating rod;

[0012] Figure 4 for Figure 2 Axonometric view of the damper shown;

[0013] Figure 5 for Figure 4 Side view of the damper shown;

[0014] Figure 6 A schematic diagram of a valve body with a snap-fit ​​groove inside;

[0015] Figure 7 for Figure 2 A schematic diagram of the adjusting screw shown;

[0016] Figure 8 This is a schematic diagram showing the flow direction of gas through the air vent of the damper;

[0017] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0018] Figure 10 This is a schematic diagram showing how the connecting part engages with the adjusting screw through a semi-circular inner groove machined on its snap-fit ​​connector.

[0019] Figure 11 This is a schematic diagram showing how the connecting part engages with the adjusting screw through a locking hole with claws machined on its locking connector.

[0020] Figure 12 This is a curve showing the gas-air ratio pressure regulation effect achievable by the present invention.

[0021] Figure 1 middle:

[0022] Main valve body 1′, First air chamber 101′, Second air chamber 102′, Solenoid valve 2′, Differential pressure valve 3′, Diaphragm 4′, Pressure regulating valve 5′, Diaphragm positive chamber 401′, Diaphragm back chamber 402′, Air signal pipe 6′, Air outlet pipe 9′, Pressure relief port 901′, Fan 10′, Venturi tube 11′

[0023] Figure 2 middle:

[0024] 1. Valve body 2. Air inlet 3. Air outlet 4. Pressure regulating device 5. Damper 51. Windshield 52. Fan blade 53. Air outlet 54. Movable arc 55. Connecting part 56. Snap-fit ​​edge 57. Inner snap groove 58. Limiting protrusion 59. Snap-fit ​​connector 591. Punch hole 592. Snap hole 593. Snap claw 6. Adjusting screw 61. Threaded section 62. Outer snap groove 63. Limiting head 7. Snap-fit ​​groove 8. Threaded hole Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In this document, terms such as "upper," "lower," "left," and "right" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. The description text has sections defining directions, and the directions defined in the text are preferred. Therefore, they should not be interpreted as absolute limitations on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another with the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0027] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a gas-controlled proportional valve provided in an embodiment of the present invention.

[0028] As shown in the figure, in one specific embodiment, the gas-controlled proportional valve provided by the present invention has an air inlet 2 at one end of its valve body 1 and an air outlet 3 at the other end. The main improvement is that a pressure regulating device 4 is provided inside the valve body 1 in front of the air outlet 3. This pressure regulating device 4 is located upstream of the air outlet 3 and close to it. The pressure regulating device 4 mainly consists of a damper 5 and an adjusting screw 6. The damper 5 has a wind deflector 51 and a fan blade 52. The wind deflector 51 is installed in the flow channel inside the valve body 1 and has an air outlet 53 corresponding to the fan blade 52. The valve body 1 has a threaded hole 8, and an adjusting screw 6 is installed in the threaded hole 8. One end of the adjusting screw 6 protrudes from the valve body 1 for easy operation, while the other end extends into the valve body 1 through the threaded hole. A fan blade 52 is connected to the end of the adjusting screw 6 that extends into the valve body 1. By turning the adjusting screw 6, it can be moved inward or outward, thereby driving the fan blade 52 to move relative to the air outlet 53, adjusting the airflow through the air outlet 53, indirectly controlling the pressure at the outlet of the valve body 1, and ultimately regulating the pressure at the gas output port of the valve body. Figure 12 The effect of gas-air ratio pressure regulation is shown.

[0029] Please continue to refer to this. Figure 3 , Figure 4 , Figure 5 , Figure 3 for Figure 2 A schematic diagram showing the connection between the damper and the regulating rod; Figure 4 for Figure 2 Axonometric view of the damper shown; Figure 5 for Figure 4 The side view of the damper shown.

[0030] As shown in the figure, the damper 5 is a stamped part. Its windshield 51 and fan blade 52 are integrally stamped from metal sheets. After the basic shape of the two is stamped and cut, they are folded in half so that the fan blade 52 and the windshield 51 form a "V" shape with a certain angle between them. The root of the fan blade 52 is provided with a movable arc 54. This movable arc 54 can give the fan blade 52 the required elasticity. At the same time, the two ends of the movable arc 54 are provided with grooves to avoid fatigue cracks and other phenomena caused by stress concentration.

[0031] The windshield 51 is roughly rectangular in shape, with two vertical rectangular air vents 53 on the left and right sides. Alternatively, there may be only one air vent 53 located in the middle of the windshield 51. Both of these methods can help maintain stable air pressure.

[0032] The fan blade 52 has a connecting part 55 located near the middle of its upper edge. This connecting part 55 is formed by bending an "L"-shaped piece of stamped material from the fan blade 52, and its root is an integral part of the fan blade 52. This structure not only saves more material, but also eliminates the need for subsequent welding, riveting, or other methods of connection, as the connecting part 55 is integrally formed with the fan blade 52. Of course, the connecting part 55 can also be made from a separate piece of material by stamping and then connecting it to the fan blade 52.

[0033] The connecting part 55 is a long and thin strip shape, forming an inverted "V" shape with the fan blade 52. One end of it is connected to the fan blade 52 as a whole, and the other end is used to connect to the inner end of the adjusting screw 6. When the adjusting screw 6 moves up and down, it can drive the fan blade 52 to swing around the root as a fulcrum through the connecting part 55, and perform a certain angle opening and closing movement relative to the air outlet 53.

[0034] To facilitate the installation of the damper 5 inside the valve body 1, the damper 5 can be snapped into the snap-fit ​​part inside the valve body 1 via a snap-fit ​​structure.

[0035] Please refer to Figure 6 , Figure 6 This is a schematic diagram of a valve body with a snap-fit ​​groove inside.

[0036] As shown in the figure, the two sides of the windshield 51 are bent inward to form snap-fit ​​edges 56. The two snap-fit ​​edges 56 are in the shape of a "V" with openings facing each other. The valve body 1 is provided with snap-fit ​​grooves 7 located on both sides of the flow channel. The snap-fit ​​grooves 7 are located on both sides of the diagonal direction of the flow channel turning part inside the valve body 1. The plane where the windshield 51 is located is at a set angle to the axis of the air outlet 3.

[0037] One of the snap-fit ​​grooves 7 is formed by the protrusions on the inner wall of the flow channel and the inner wall. The other snap-fit ​​groove is formed by two protrusions on the inner wall of the flow channel that are at an angle to each other. Both snap-fit ​​grooves 7 are in the shape of a "V" with an angle of less than 90°. The angle of the "V" shape of the snap-fit ​​edge 56 can be slightly larger than the angle of the "V" shape of the snap-fit ​​groove 7, so that the snap-fit ​​edge 56 can use its elasticity to snap onto the inner surface of the snap-fit ​​groove 7 through its outer surface.

[0038] This structure not only makes full use of the turning space of the flow channel in valve body 1, but also has a reasonable structural design, is easy to assemble and adjust, and can achieve better gas flow effect.

[0039] Please refer to this as well. Figure 7 , Figure 7 for Figure 2 The diagram shows the structure of the adjusting screw.

[0040] As shown in the figure, the adjusting screw 6 is provided with a threaded section 61, an outer groove 62 and a limiting head 63 in sequence along the axial direction. The outer groove 62 is annular and the limiting head 63 is a protruding cylindrical shape. There is a frustoconical transition section between the outer groove 62 and the limiting head 63. The adjusting screw 6 is engaged with the threaded hole on the valve body 1 through the threaded section 61. The fan blade 52 is connected to the outer groove 62 of the adjusting screw 6 through the connecting part 55.

[0041] The end of the connecting part 55 connected to the adjusting screw 6 is provided with an inner groove 57 and a limiting protrusion 58. The adjusting screw 6 is engaged with the inner groove 57 of the connecting part 55 through the outer groove 62. The limiting protrusion 58 is supported from the side by the limiting head 63 so that the adjusting screw 6 and the connecting part 55 are kept engaged.

[0042] During assembly, tooling or tweezers can be used to engage the connecting part 55 into the outer slot 62 of the adjusting screw 6. At the same time, the limiting protrusion 58 of the connecting part 55 is limited to the limiting head 63 of the adjusting screw 6 to prevent the connecting part 55 from disengaging from the adjusting screw 6 when the adjusting screw 6 moves up and down.

[0043] Please refer to Figure 8 , Figure 9 , Figure 8 This is a schematic diagram showing the flow direction of gas through the air vent of the damper; Figure 9 for Figure 8 A magnified view of a portion of the image.

[0044] As shown in the figure, the end of the connecting part 55 connected to the adjusting screw 6 is provided with a bent snap connector 59. In this embodiment, the snap connector 59 is an enlarged diameter part formed after cutting. The snap connector 59 is provided with a punch hole 591 formed after stamping and de-materializing. The inner groove 57 is located on one side of the inner wall of the punch hole 591, and the limiting protrusion 58 is located on the other side of the inner wall of the punch hole 591. The side of the snap connector 59 with the limiting protrusion 591 is bent towards the end of the adjusting screw 6. The limiting protrusion 58 and the inner groove 57 are misaligned in the axial direction of the adjusting screw 6.

[0045] In this way, when the connection is engaged, the connecting part 55 deflects at a certain angle under the action of external force, so that the end of the adjusting screw 6 passes through the punch 591 on the connecting part 55. After the connecting part returns to its original position under its own elastic force, its inner groove 57 can be engaged with the outer groove 62 of the adjusting screw 6. At this time, the limiting protrusion 58 is also just supported by the limiting head 63 of the adjusting screw 6.

[0046] In other embodiments, the limiting protrusion 58 on the connecting part 55 can be omitted. If the limiting protrusion 58 is omitted, the inner groove 57 on the snap-fit ​​connector 59 can be designed to be semi-circular. Since the semi-circular inner groove 57 has a certain elasticity in its opening and has a limiting function, it can prevent the adjusting screw 6 from disengaging from the connecting part 55. Therefore, it can be snapped into the outer groove 62 of the adjusting screw 6 alone, without the need to provide the limiting protrusion 58 (see...). Figure 10 ).

[0047] In another embodiment, the snap-fit ​​connector 59 is provided with a snap-fit ​​hole 592. The inner wall of the snap-fit ​​hole 592 has multiple outwardly flared snap claws 593. When the head of the adjusting screw 6 passes through the snap-fit ​​hole 592, the snap claws 593 can engage with the outer snap-fit ​​groove 62 of the adjusting screw 6, thereby engaging the connecting part 55 with the end of the adjusting screw 6, thus achieving the same objective of the present invention (see [link]). Figure 11 ).

[0048] The above embodiments are merely preferred embodiments of the present invention and are not limited thereto. Based on these, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, the windshield 51 and the fan blade 52 can be assembled separately; or the adjusting screw 6 can move up and down using a locking mechanism; or the air vent 53 can be asymmetrical with respect to the fan blade 52, etc. Since there are many possible implementation methods, they will not be listed here.

[0049] When in use, the gas-controlled proportional valve moves up and down by rotating the adjusting screw 6. This causes the fan blade 52 to open and close at a certain angle relative to the air outlet 53 via the connecting part 55, thereby changing the flow rate of the air outlet 53. Ultimately, this allows for the adjustment of the gas outlet pressure curve without changing the air signal waveform, thus meeting the power switching requirements of different models.

[0050] The installation method of the gas valve provided in this application is described below:

[0051] Prepare valve body 1 and adjusting device 4, so that valve body 1 is machined to form a limited seat and internal thread, and adjusting device 4 includes damper 5 and adjusting rod. Damper 5 includes windshield 51 and fan blade 52. Adjusting rod is machined with external thread to form adjusting screw 6.

[0052] The windshield 51 is machined to have an arc-shaped edge. The windshield 5 is inserted into the valve body 1 by sliding the arc-shaped edge with the limit seat. The external thread of the adjusting rod is threadedly engaged with the internal thread of the valve body 1.

[0053] Use tweezers to snap the clip 59 of the fan blade 52 onto the adjusting rod.

[0054] The remaining structure of the gas-controlled proportional gas valve can be found in the background section and will not be described further. However, it is understood that the pressure regulating device of the present invention is applicable not only to the fully premixed gas-controlled proportional gas valve exemplified in the background section, but also to other gas-controlled proportional gas valves with different structures.

[0055] The gas valve provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A gas valve, comprising a valve body (1) having an inlet (2) and an outlet (3), characterized in that, It also includes a pressure regulating device (4), which is located inside the valve body (1) and is close to the air outlet (3). The pressure regulating device (4) includes a damper (5) and an adjusting rod. The damper (5) has a windshield (51) and a fan blade (52). The windshield (51) is limitedly connected to the valve body (1). The windshield (51) is provided with an air outlet (53) corresponding to the fan blade (52). The adjusting rod is threadedly engaged with the valve body (1) and can move relative to the valve body (1). The fan blade (52) is connected to the adjusting rod. The adjusting rod can drive the fan blade (52) to move relative to the air outlet (53) to adjust the flow rate of the air outlet (53). When the adjusting rod moves, it causes the fan blade (52) to open and close at a certain angle relative to the air outlet (53); The fan blades (52) are connected to the windshield (51) at an angle, and the two form a "V" shape; The adjusting rod includes an adjusting screw (6), which engages with the threaded hole of the valve body (1) through a threaded section (61). The fan blade (52) is connected to the adjusting screw (6) through a connecting part (55). The connecting part (55) and the fan blade (52) are in the shape of an inverted "V". One end of the connecting part is connected to the fan blade (52), and the other end is connected to the adjusting screw (6). The damper (5) is a stamped part. The windshield (51) and the fan blade (52) are integrally stamped from metal sheets.

2. The gas valve according to claim 1, characterized in that, The damper (5) is snapped into the valve body (1) by a snap-fit ​​structure.

3. The gas valve according to claim 2, characterized in that, The snap-fit ​​structure includes snap-fit ​​edges (56) formed by bending inward from both sides of the windshield (51). The valve body (1) has snap-fit ​​grooves (7) located on both sides of the flow channel. The snap-fit ​​edges (56) are snapped onto the inner surface of the snap-fit ​​grooves (7) through their outer surfaces.

4. The gas valve according to claim 3, characterized in that, The snap-fit ​​edge (56) is in the shape of an "V" with opposite openings.

5. The gas valve according to claim 4, characterized in that, The plane containing the windshield (51) is at a set angle to the axis of the air outlet (3).

6. The gas valve according to claim 5, characterized in that, The snap-fit ​​grooves (7) are located on both sides of the diagonal direction of the flow channel turning part.

7. The gas valve according to claim 1, characterized in that, The inner end of the adjusting screw (6) is provided with an outer groove (62) and a limiting head (63). The end of the connecting part (55) connected to the adjusting screw (6) is provided with an inner groove (57) and a limiting protrusion (58). The adjusting screw (6) is engaged with the inner groove (57) of the connecting part (55) through the outer groove (62). The limiting protrusion (58) is supported by the limiting head (63) from the side so that the adjusting screw (6) and the connecting part (55) are kept engaged.

8. The gas valve according to claim 7, characterized in that, The end of the connecting part (55) connected to the adjusting screw (6) is provided with a bent snap connector (59). The snap connector (59) is provided with a punch (591) formed after material removal. The inner slot (57) is located on one side of the inner wall of the punch (591), and the limiting protrusion (58) is located on the other side of the inner wall of the punch (591).

9. The gas valve according to claim 8, characterized in that, The snap connector (59) has a limiting protrusion (58) on one side bent toward the end of the adjusting screw (6), and the limiting protrusion (58) and the inner slot (57) are misaligned in the axial direction of the adjusting screw (6).

10. The gas valve according to claim 1, characterized in that, The inner end of the adjusting screw (6) is provided with an outer groove (62), and the end of the connecting part (55) connected to the adjusting screw (6) is provided with an inner groove (57) that is semi-circular. The adjusting screw (6) is connected to the inner groove (57) of the connecting part (55) through the outer groove (62).

11. The gas valve according to claim 10, characterized in that, The end of the connecting part (55) connected to the adjusting screw (6) is provided with a bent snap connector (59), and the snap connector (59) is provided with a punch (591) formed after material removal, and the inner slot (57) is located on one side of the inner wall of the punch (591).

12. The gas valve according to claim 1, characterized in that, The inner end of the adjusting screw (6) is provided with an outer groove (62), and the end of the connecting part (55) connected to the adjusting screw (6) is provided with a locking hole (592). The adjusting screw (6) is connected to the locking hole (592) of the connecting part (55) through the outer groove (62).

13. The gas valve according to claim 12, characterized in that, The end of the connecting part (55) connected to the adjusting screw (6) is provided with a bent snap connector (59), and the snap hole (592) is provided in the snap connector (59), and its inner wall has a plurality of snap claws (593) formed by outward turning.

14. The gas valve according to any one of claims 1 to 13, characterized in that, The connecting part (55) is formed by stamping and tearing material on the fan blade (52), and its root is an integral structure with the fan blade (52).

15. The gas valve according to claim 1, characterized in that, The root of the fan blade (52) is provided with a movable arc (54).

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