A current limiting and anti-vibration breathing hole structure and a gas proportional valve

Abstract

The present invention relates to the field of gas valve production, and in particular to a flow-limiting and anti-vibration breathing hole structure and a gas proportional valve, comprising a breathing hole carrier, wherein a connected inner breathing hole and an installation cavity are provided on the breathing hole carrier, a freely movable damping member is provided on the side of the installation cavity close to the inner breathing hole, and a sealing member is provided on the side away from the inner breathing hole, and an outer breathing hole connected to the inner breathing hole is provided on the sealing member; the advantage is that by arranging a damping member between the inner and outer breathing holes, the damping member is pressed toward the outer breathing hole and remains relatively still under the impact of the instantaneous airflow generated by the rupture of the pressure regulating diaphragm, so that the leakage of the breathing hole is lower than the standard value, so the aperture of the breathing hole of the present invention can be appropriately enlarged, thereby further improving the adjustment speed of the pressure regulating diaphragm in response to the pressure fluctuation when the gas proportional valve is inlet or outlet, so that the gas proportional valve can be used for liquefied gas models with higher intake pressure.

Description

Technical Field

[0001] The invention relates to the field of gas valve production, and in particular to a current-limiting and anti-vibration breathing hole structure and a gas proportional valve. Background Art

[0002] The pressure regulating diaphragm in the gas proportional valve plays a role in stabilizing the pressure. When the inlet and outlet pressures fluctuate, the feedback pressure on the pressure regulating diaphragm is unstable, causing the diaphragm to vibrate, which in turn causes the outlet pressure to become unstable and remain in a fluctuating state, affecting the customer's use effect.

[0003] like Figures 1 to 3 As shown, in order to alleviate this phenomenon in the prior art, a single breathing hole is set on the outer wall of the cavity below the pressure regulating diaphragm (away from the gas surface). Considering safety, according to the requirements of GB / T30597-20146.2.1, the leakage of the breathing hole should not exceed 70L / h (when the pressure regulating diaphragm ruptures and the gas leaks out). The larger the breathing hole, the higher the maximum operating pressure of the gas proportional valve, and the greater the leakage of the breathing hole.

[0004] When the gas proportional valve is used in natural gas water heater equipment, the maximum operating pressure of natural gas is about 3KPa. In order to better suppress the vibration of the pressure regulating diaphragm, the breathing hole is generally set at 0.6-0.9mm. The larger the breathing hole, the easier it is for the airflow formed by the vibration of the pressure regulating diaphragm to pass through the breathing hole. The pressure regulating diaphragm responds to the pressure change more quickly, the outlet pressure balance is established faster, and the diaphragm vibration suppression is more obvious. At this time, the 0.6-0.9mm breathing hole can meet the use requirements of the natural water heater with a maximum intake pressure of 3KPa.

[0005] When the gas proportional valve is used for high-power liquefied gas models, the intake pressure is generally up to 4.5KPa, and the 0.6-0.9mm breathing hole cannot effectively suppress the pulsation of the pressure regulating diaphragm. The existing solution is to add a pressure reducing valve to the intake end of the water heater to reduce the pressure to below 3 KPa. This method not only increases the cost, but also increases the product volume and affects the appearance. At the same time, the leakage value of the 0.6-0.9mm breathing hole is close to or exceeds the standard value of 70L / h. Therefore, how to effectively suppress the vibration of the pressure regulating diaphragm under high intake pressure and ensure that the leakage value of the breathing hole does not exceed the safety requirement of 70L / h has become a problem that technical personnel in the industry urgently need to solve. Summary of the invention

[0006] The object of the present invention is to provide a flow-limiting and anti-vibration breathing hole structure and a gas proportional valve, so that the gas proportional valve has better pressure regulation stability and pressure applicability, and is safer.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] A current-limiting and anti-vibration breathing hole structure comprises a breathing hole carrier, on which a connected inner breathing hole and an installation cavity are provided, a freely movable damping member is provided on a side of the installation cavity close to the inner breathing hole, and a sealing member is provided on a side away from the inner breathing hole, and an outer breathing hole connected to the inner breathing hole is provided on the sealing member.

[0009] Furthermore, the area of ​​the inner breathing hole or the outer breathing hole is not larger than the area of ​​the annular gap between the outer diameter of the damping element and the inner diameter of the installation cavity.

[0010] Furthermore, the diameters of the inner and outer breathing holes are not less than 0.9 mm, and the diameters of the inner breathing holes and / or the outer breathing holes are not greater than 1.6 mm.

[0011] Furthermore, the movable gap of the damping member along the axial direction of the installation cavity is larger than the sum of the openings of the inner and outer breathing holes when they are fully open without throttling.

[0012] Furthermore, the damping element is spherical.

[0013] Furthermore, the damping element is a hollow sphere.

[0014] Furthermore, a movable gap of the damping member along the axial direction of the installation cavity is smaller than a radius of the damping member.

[0015] Furthermore, the damping element is in sheet shape.

[0016] Furthermore, the damping element is made of low-density material.

[0017] A gas proportional valve comprises any one of the above-mentioned breathing hole structures.

[0018] The advantages of the present invention are:

[0019] 1. By arranging a damping member between the inner and outer breathing holes, the damping member is pressed toward the outer breathing hole and remains relatively still under the impact of the instantaneous airflow generated by the rupture of the pressure regulating diaphragm, so that the leakage of the breathing hole is lower than the standard value. Therefore, the aperture of the breathing hole of the present invention can be appropriately enlarged, thereby further improving the adjustment speed of the pressure regulating diaphragm in response to the pressure fluctuation when the gas proportional valve is inlet or outlet, so that the gas proportional valve can be used for liquefied gas models with higher inlet pressure;

[0020] 2. The breathing hole structure is suitable for the existing gas proportional valve, and has the advantages of simple improvement and low cost, and can make the pressure regulation stability and pressure applicability of the gas proportional valve better and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a plan view of a gas proportional valve on the breathing hole structure side in the prior art;

[0022] Figure 2It is a cross-sectional schematic diagram of a gas proportional valve in the prior art;

[0023] Figure 3 It is a plan view of a breathing hole carrier in the prior art;

[0024] Figure 4 for Figure 3 AA cross-sectional view in FIG.

[0025] Figure 5 It is a schematic plan view of the breathing hole carrier in the embodiment;

[0026] Figure 6 for Figure 5 BB cross-sectional view in FIG.

[0027] Figure 7 for Figure 5 Schematic diagram of a three-dimensional explosion;

[0028] Figure 8 A schematic diagram of the structure of the sealing member in the embodiment;

[0029] Fig. 9 is a cross-sectional schematic diagram of the breathing hole structure in the embodiment;

[0030] Description of symbols

[0031] Breathing hole carrier 1, inner breathing hole 2, mounting cavity 3, damping element 4, sealing element 5, outer breathing hole 6, transition cavity 7, and existing single breathing hole 8. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the embodiments.

[0033] This embodiment proposes a current limiting and anti-vibration breathing hole structure, such as Figures 5 to 9 As shown, it includes a breathing hole carrier 1. The structure of this embodiment is mainly used for a gas proportional valve, so the breathing hole carrier 1 adopts a proportional adjustment component. The breathing hole carrier 1 is provided with an inner breathing hole 2, a transition cavity 7 and a mounting cavity 3 that are connected from the inside to the outside. The length of the transition cavity 7 mainly depends on the wall thickness of the breathing hole carrier 1. A freely movable damping member 4 is provided on the side of the mounting cavity 3 close to the inner breathing hole 2, and a sealing member 5 is provided on the side away from the inner breathing hole 2. The sealing member 5 is pressed into the mounting cavity 3 by interference fit to achieve sealing. The sealing member 5 is provided with an outer breathing hole 6 that is connected to the inner breathing hole 2.

[0034] After a damping member 4 is arranged between the inner breathing hole 2 and the outer breathing hole 6, due to the fact that the damping member 4 is pressed against the outer breathing hole 6 and remains relatively stationary under the impact of the instantaneous airflow generated by the rupture of the pressure regulating diaphragm, playing a role in current limiting, the leakage amount of the breathing hole is lower than the standard value. Therefore, the aperture of the inner breathing hole 2 or the outer breathing hole 6 of this breathing hole structure can be appropriately enlarged, thereby further improving the adjustment speed of the pressure regulating diaphragm in response to the pressure fluctuation during the intake or exhaust of the gas proportional valve, enabling the gas proportional valve to be used in liquefied gas models with higher intake pressures.

[0035] The damping member 4 can be made of low-density materials, such as plastics, rubbers, etc., which have the characteristics of low cost and light weight, so as to improve the sensitivity of the damping member 4 to move freely with the fluttering airflow. When the pressure regulating diaphragm is not ruptured, the fluttering airflow formed by the fluttering of the pressure regulating diaphragm can cause the damping block to follow the fluttering, adaptively adjust the throttling degree of the breathing hole according to the fluttering frequency of the pressure regulating diaphragm, break the fluttering frequency of the pressure regulating diaphragm, and can effectively suppress the fluttering of the pressure regulating diaphragm to ensure the stable outlet pressure of the gas proportional valve. No connection structure such as a spring is provided between the damping member 4 and the installation cavity 3. Although the setting of the spring is beneficial for the damping member 4 to block the outer breathing hole 6 to achieve better current limiting effect, the setting of the spring will inevitably affect the sensitivity of the damping member 4 to flutter.

[0036] As Fig. 9 shown, the diameter of the inner breathing hole 2 is denoted as D0, the diameter of the outer breathing hole 6 is denoted as D2, the diameter of the damping member 4 is denoted as D3, the thickness of the damping member 4 is t, the movable gap of the damping member 4 along the axial direction of the installation cavity 3 is H - t, the area of the inner breathing hole 2 is S0, the annular gap area between the outer diameter of the damping member 4 and the inner diameter of the installation cavity 3 is S1, and the area of the outer breathing hole 6 is S2.

[0037] When the damping member 4 is a hollow sphere, t = D3. The breathing hole structure of this embodiment needs to meet the following requirements: the area of the inner breathing hole 2 or the outer breathing hole 6 is not greater than the annular gap area between the outer diameter of the damping member 4 and the inner diameter of the installation cavity 3, that is, S1≥S2 or S1≥S0; the aperture diameters of the inner and outer breathing holes 6 are not less than 0.9 mm, that is, D0≥0.9 and D2≥0.9; the aperture diameter of the inner breathing hole 2 and / or the outer breathing hole 6 is not greater than 1.6 mm, that is, D0≤1.6 and / or D2≤1.6; the movable gap of the damping member 4 along the axial direction of the installation cavity 3 is greater than the sum of the fully open and non-throttling opening degrees of the inner and outer breathing holes 2 and 6, that is, H - t > (D0 + D2) / 4, so as to realize the adjustment of the non-throttling inner and outer breathing holes 2 and 6 by the damping member 4.

[0038] When the damping member 4 is a sheet-like diaphragm, the breathing hole structure not only needs to meet the dimensional requirements when it is a hollow sphere, but also needs to meet the following requirements: the movable gap of the damping member 4 along the axial direction of the installation cavity 3 is less than the radius of the damping member 4, that is, H - t < D3 / 2, so as to avoid the sheet-like damping member 4 being stuck obliquely and losing the adjustment effect.

[0039] The above embodiments are only used to explain the concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A current limiting and anti-vibration breathing hole structure, comprising a breathing hole carrier, characterized in that: The breathing hole carrier is provided with an inner breathing hole and an installation cavity connected to each other, a freely movable damping member is provided on the side of the installation cavity close to the inner breathing hole, and a sealing member is provided on the side away from the inner breathing hole, and an outer breathing hole connected to the inner breathing hole is provided on the sealing member; the area of ​​the inner breathing hole or the outer breathing hole is not larger than the annular gap area between the outer diameter of the damping member and the inner diameter of the installation cavity, the apertures of the inner and outer breathing holes are not smaller than 0.9 mm, and the apertures of the inner and outer breathing holes and / or the outer breathing holes are not larger than 1.6 mm; the movable gap of the damping member along the axial direction of the installation cavity is larger than the sum of the openings of the inner and outer breathing holes when they are fully opened without throttling; The damping member is a hollow sphere; or the movable gap of the damping member along the axial direction of the installation cavity is smaller than the radius of the damping member, and the damping member is in the form of a sheet.

2. A current limiting and anti-vibration breathing hole structure as claimed in claim 1, characterized in that: The damping element is made of low-density material.

3. A gas proportional valve, characterized in that: Includes any one of the breathing hole structures 1 to 2.

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