Fuel gas pressure regulator with novel valve element structure

Abstract

The utility model belongs to the technical field of gas pressure regulators, and particularly relates to a gas pressure regulator with a novel valve element structure. A gas inlet and a gas outlet are formed in the two sides of the valve body, a diaphragm cavity is formed in the upper portion of the valve body, a diaphragm is arranged in the diaphragm cavity to divide the diaphragm cavity into an upper cavity body and a lower cavity body, a tray and a pressure adjusting spring are arranged in the upper cavity body, and the lower cavity body is provided with a signal feedback channel communicated with the gas inlet or the gas outlet. A valve rod penetrating through the diaphragm, the tray and the pressure adjusting spring is arranged in the valve body, the valve rod is connected with the tray, a valve element matched with the valve port is arranged at the end of the valve rod and comprises a limiting plate arranged on the valve rod in a sleeving mode and a circular-truncated-cone-shaped pre-pressing block, and an elastic deformation piece is arranged between the limiting plate and the pre-pressing block; the gas pressure regulator adopts an elastic pre-pressed valve core structure, and has the characteristics of sensitive overpressure cut-off, tight valve port sealing, long acting and stability.

Description

A novel gas pressure regulator with a valve core structure Technical Field

[0001] This utility model belongs to the technical field of gas pressure regulators, specifically relating to a gas pressure regulator with a novel valve core structure. Background Technology

[0002] In existing gas pressure regulators, the sealing structure of the valve core and valve port is too simple. Generally, the valve core uses a plate structure to seal the valve port. Most products generally have unstable operating conditions in the gas transmission and distribution network during operation, often resulting in large changes in the secondary pressure after regulation, and even phenomena such as "gasping" or vibration, causing problems such as poor valve port sealing, which affects the normal gas supply to users.

[0003] During long-term use, foreign objects such as welding slag, rust, and sand in the gas can easily get stuck between the sealing surfaces of the valve seat and the valve core, forming a physical gap. Even tiny particles can cause internal leakage. If the gas contains heavy components, such as liquefied petroleum gas (LPG), it may form sticky residues at the valve port, reducing the fit of the sealing surface. Frequent opening and closing or media flushing can cause wear on the contact surfaces of the valve core and valve seat. Significant leakage occurs when the wear of the sealing seat exceeds 0.1 mm. Especially when the valve opening is small, the airflow impacts and corrodes the rubber sealing ring most severely, causing hardening, cracking, and loss of the ability to compensate for minor deviations. Summary of the Invention

[0004] The purpose of this utility model is to provide a gas pressure regulator with an elastic pre-compression valve core structure, which features sensitive overpressure cutoff, tight valve port sealing, and long-term stability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel gas pressure regulator with a valve core structure is characterized by: a valve body having an internal valve port; an inlet and an outlet on both sides of the valve body; a diaphragm cavity at the upper part of the valve body; a diaphragm dividing the diaphragm cavity into an upper cavity and a lower cavity; a tray and a pressure regulating spring in the upper cavity; and a signal feedback channel connecting the inlet or outlet in the lower cavity. The valve body contains a valve stem that passes through the diaphragm, tray, and pressure regulating spring; the valve stem is connected to the tray; a valve core that mates with the valve port is located at the end of the valve stem; the valve core includes a limiting plate fitted onto the valve stem and a frustum-shaped pre-compression block; and an elastic deformation element is provided between the limiting plate and the pre-compression block.

[0007] Additional technical features of the gas pressure regulator constituting the above-mentioned novel valve core structure also include:

[0008] —The elastic deformation component is a spring or an elastomer made of fluororubber, hydrogenated nitrile rubber, or perfluoroether rubber, and the elastomer is an annular sealing ring or a spherical sealing body;

[0009] —The cross-sectional shape of the valve port is trapezoidal, and a boss corresponding to the limiting plate of the valve core is provided above the valve port;

[0010] —The diaphragm cavity is composed of an upper valve shell and a lower valve shell, the edges of which are connected by screws or bolts. The bottom of the lower valve shell is connected to the top wall of the valve body by bolts, and both are provided with a through hole for the valve stem to pass through. The signal feedback channel is also located inside the docking part of the two, with its upper end connected to the lower cavity of the diaphragm cavity and its lower end connected to the air inlet.

[0011] —A positioning cylinder and a sliding sleeve are provided between the valve stem and the tray, which slide relative to each other. The lower part of the positioning cylinder is placed in the through hole at the bottom of the lower valve housing, and the sliding sleeve is placed outside the positioning cylinder and connected to the tray. The positioning cylinder has a ball bearing, which is placed in a through hole on its surface. The valve stem has a groove that matches the ball bearing, and the bottom of the groove is sloped. A flange that presses the ball bearing is provided on the upper part of the inner wall of the sliding sleeve. A cut-off spring is installed below the valve stem, and the cut-off spring is placed between the limiting plate and the top wall of the valve body.

[0012] —The number of combinations of through holes and corresponding balls on the positioning cylinder is 4 to 8, and the combinations are evenly distributed along the circumference of the positioning cylinder.

[0013] —A drain screw hole is provided at the bottom of the valve body, which is connected to the air outlet, and a locking bolt is installed in the drain screw hole.

[0014] Compared with the prior art, the gas pressure regulator with a novel valve core structure provided by this utility model has the following advantages: Based on the traditional pressure regulating structure, the gas pressure regulator sets the single valve core into a composite structure, that is, the valve core includes a limiting plate fitted on the valve stem and a frustum-shaped pre-compression block. An elastic deformation element is set between the limiting plate and the pre-compression block. The elastic deformation element forms a pre-tightening pressure on the pre-compression block, so that it is always in a sealed contact with the valve port. This avoids the frequent opening and closing of the valve port caused by upstream and downstream pressure fluctuations during the operation of the pressure regulator, and even phenomena such as "breathing" or vibration. The pressure regulator has sensitive overpressure cut-off and long-term stable valve port closure. It has the advantages of simple structure, convenient use, safety and durability. Attached Figure Description

[0015] Figure 1 is a structural schematic diagram of a gas pressure regulator with a novel valve core structure according to this utility model. Detailed Implementation

[0016] The following detailed description, with reference to the accompanying drawings, illustrates the structure and working principle of the gas pressure regulator with the novel valve core structure provided by this utility model. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] In the description of this utility model, unless otherwise stated, the terms "upper / lower", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] As shown in Figure 1, the gas pressure regulator structure of this novel valve core structure includes a valve body 2 with a valve port 1 inside. The valve body 2 has an air inlet 31 and an air outlet 32 ​​on both sides. The upper part of the valve body 2 is provided with a diaphragm cavity. A diaphragm 40 is provided in the diaphragm cavity to divide it into an upper cavity 41 and a lower cavity 42. The upper cavity 41 is provided with a tray 51 and a pressure regulating spring 52. The lower cavity 42 has a signal feedback channel 6 that connects to the air inlet 31 or the air outlet 32. The valve body 2 is provided with a valve stem 7 that passes through the diaphragm 40, the tray 51, and the pressure regulating spring 52. The valve stem 7 is connected to the tray 51. The end of the valve stem 7 is provided with a valve core that cooperates with the valve port 1. The valve core includes a limiting plate 81 fitted on the valve stem 7 and a frustum-shaped pre-compression block 82. An elastic deformation member is provided between the limiting plate 81 and the pre-compression block 82.

[0020] Its working principle is as follows: The upper part of the valve body 2 of the gas pressure regulator has a diaphragm cavity, which is divided into an upper cavity 41 and a lower cavity 42 by a diaphragm 40. The tray 51 in the upper cavity 41 is connected to the pressure regulating spring 52 and the diaphragm 40 respectively. The lower cavity 42 has a signal feedback channel 6 that connects to the air inlet 31 or the air outlet 32. The pressure change in the lower cavity 42 causes the diaphragm 40 and the tray 51 to float up and down, which in turn causes the pressure regulating spring 52 to drive the valve stem 7 to change. The valve core at the end of the valve stem 7 is connected to the valve port 1. The valve core is composed of a limiting plate 81 fitted on the valve stem 7 and a frustum-shaped pre-pressure block 82, with an elastic deformation element between them. When the limiting plate 81 closes the valve port 1, the pre-pressure block 82 generates a pre-tightening pressure on the valve port 1 under the action of the elastic deformation element. In this way, even if the valve port 1 experiences pressure fluctuations, the pre-pressure block 82 will always be in sealed contact with the valve port 1, ensuring stable sealing and preventing internal leakage, thus improving the safety performance of the pressure regulator.

[0021] In the structure of the gas pressure regulator that constitutes the above-mentioned novel valve core structure

[0022] —The above-mentioned elastic deformation component can be a stainless steel spring 83, or an elastomer made of fluororubber, hydrogenated nitrile rubber, or perfluoroether rubber. This modified high-performance rubber has advantages such as corrosion resistance and impact resistance, and can achieve long-term sealing effect. It is not prone to cracking or hardening. The elastomer is an annular sealing ring or a spherical sealing body. It is compressed and deformed between the limiting plate 81 and the pre-compression block 82, which can provide pre-tightening pressure and is in a hidden position to avoid damage from airflow impact.

[0023] — Preferably, the cross-sectional shape of the valve port 1 is trapezoidal, and a boss 11 corresponding to the limiting plate 81 of the valve core is provided above the valve port 1, that is, the pre-compression block 82 can enter the interior of the valve port 1. Since the pre-compression block 82 is frustum-shaped, its upper and lower edges form cutting edges to scrape the inner wall of the valve port 1, and clean the impurities, grease and other sticky substances attached to the valve port 1 in time, so as to ensure that the sealing surface of the valve port 1 is smooth and the sealing fit is good.

[0024] — Preferably, the diaphragm 40 cavity is composed of an upper valve housing 43 and a lower valve housing 44, the edges of which are connected by screws or bolts 46. The bottom of the lower valve housing is connected to the top wall of the valve body 2 by bolts 46, and both are provided with a through hole 45 for the valve stem 7 to pass through. The signal feedback channel 6 is also provided inside the docking part of the two, with its upper end connected to the lower cavity 42 of the diaphragm 40 cavity and its lower end connected to the air inlet 31. That is, the signal feedback channel is hidden in the valve body 2, the equipment connection is simpler, the safety performance is enhanced, and the valve body 2 adopts a split assembly structure, which facilitates later disassembly and maintenance.

[0025] —Furthermore, a positioning cylinder 70 and a sliding sleeve 50 are provided between the valve stem 7 and the tray 51 for relative sliding. The lower part of the positioning cylinder 70 is placed inside the through hole 45 at the bottom of the lower valve housing 44, and the sliding sleeve 50 is placed outside the positioning cylinder 70 and connected to the tray 51. The positioning cylinder 70 has a ball 501, which is placed in a through hole on its surface. The valve stem 7 has a groove 71 that matches the ball 501. The bottom of the groove 71 is sloped. A flange 502 is provided on the upper part of the inner wall of the sliding sleeve 50 to press the ball 501. That is, when the valve port 1 of the pressure regulator is normally open, the flange 502 of the sliding sleeve 50 presses the ball 501, so that it is located between the through hole of the positioning cylinder 70 and the valve stem 70. Between the grooves 71, the valve stem 7 and the positioning cylinder 70 are locked together. After the overpressure airflow fed back from the air inlet 31 enters the lower chamber 42, it pushes the diaphragm 40 and the tray 51 to move upward. The tray 51 drives the sliding sleeve 50 to move synchronously. The flange 502 of the sliding sleeve 50 no longer presses the ball 501. The ball 501 enters the recess 503 below the flange 502 of the sliding sleeve and the through hole of the positioning cylinder 70. The valve stem 7 and the positioning cylinder 70 are unlocked. At this time, since the cut-off spring 72 is installed below the valve stem 7, and the cut-off spring 72 is placed between the limiting plate 81 and the top wall of the valve body 2, under the action of the cut-off spring 72, the valve stem 7 is pushed downward. The valve core at its end closes the valve port 1, realizing the overpressure cut-off function.

[0026] — Preferably, the number of combinations formed by the through holes on the positioning cylinder 70 and the corresponding ball bearings 501 is 4 to 8, and the combinations are evenly distributed along the circumference of the positioning cylinder 70. This ball bearing locking structure applies a balanced locking force to the valve stem 7, has a sensitive unlocking response, and provides stable overpressure cutoff.

[0027] —Furthermore, a drain screw hole 91 is provided at the bottom of the valve body 2. The drain screw hole 91 is connected to the air outlet 32. A locking bolt 92 is installed in the drain screw hole 91. That is, after overpressure cutoff, the locking bolt 92 is rotated to open the drain screw hole 91, and the impurities and oil stains below the valve port 1 are automatically discharged. It can also be rinsed and cleaned through the drain screw hole 91.

[0028] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A gas pressure regulator of a new valve plug structure, characterized by: The valve body includes an internally configured valve port. The valve body has an inlet and an outlet on both sides. A diaphragm cavity is located at the top of the valve body, and a diaphragm divides the cavity into an upper and lower chamber. A tray and a pressure regulating spring are located in the upper chamber. The lower chamber has a signal feedback channel connecting to either the inlet or the outlet. The valve body contains a valve stem that passes through the diaphragm, tray, and pressure regulating spring. The valve stem is connected to the tray. A valve core that mates with the valve port is located at the end of the valve stem. The valve core includes a limiting plate fitted onto the valve stem and a frustum-shaped pre-compression block. An elastic deformation element is provided between the limiting plate and the pre-compression block.

2. A gas pressure regulator of the new valve core structure according to claim 1, characterized in that: The elastic deformation component is a spring or an elastomer made of fluororubber, hydrogenated nitrile rubber, or perfluoroether rubber, and the elastomer is an annular sealing ring or a spherical sealing body.

3. A gas pressure regulator of the new valve core structure according to claim 1 or 2, characterized in that: The valve port has a trapezoidal cross-sectional shape, and a boss corresponding to the limiting plate of the valve core is provided above the valve port.

4. A gas pressure regulator with a novel valve core structure according to claim 1, characterized in that: The diaphragm cavity is composed of an upper valve housing and a lower valve housing, the edges of which are connected by screws or bolts. The bottom of the lower valve housing is connected to the top wall of the valve body by bolts, and both are provided with a through hole for the valve stem to pass through. The signal feedback channel is also located inside the docking part of the two, with its upper end connected to the lower cavity of the diaphragm cavity and its lower end connected to the air inlet.

5. A gas pressure regulator of the new valve trim construction according to claim 4, characterized in that: A positioning cylinder and a sliding sleeve are provided between the valve stem and the tray, with the lower part of the positioning cylinder placed in the through hole at the bottom of the lower valve housing. The sliding sleeve is placed outside the positioning cylinder and connected to the tray. The positioning cylinder has a ball bearing, which is placed in a through hole on its surface. The valve stem has a groove that matches the ball bearing, with a slope at the bottom. A flange that presses against the ball bearing is provided on the upper part of the inner wall of the sliding sleeve. A cut-off spring is fitted below the valve stem and is placed between the limiting plate and the top wall of the valve body.

6. A gas pressure regulator with a novel valve core structure according to claim 5, characterized in that: The number of combinations consisting of through holes and corresponding balls on the positioning cylinder is 4 to 8, and the combinations are evenly distributed along the circumference of the positioning cylinder.

7. A gas pressure regulator of the new valve core structure according to claim 4, characterized in that: The bottom of the valve body is provided with a drain screw hole, which is connected to the air outlet, and a locking bolt is installed in the drain screw hole.

Images