Single stage piston pressure reducing valve

Abstract

The utility model relates to fluid pressure control equipment technical field, concretely relates to a single stage piston pressure reducing valve, including air inlet cavity, ball seal, steel ball, keep spring, exhaust head, front end seal, rear end sealing washer, air inlet piston piece and pressure regulating assembly, the cooperation of air inlet cavity, ball seal, steel ball and keep spring makes steel ball under different stress state, can guarantee the high pressure gas of entering, does not leak, plays the regulating valve opening and closing amount function to provide the precondition of the regulation and control of high pressure to low pressure, through coaxial integration design, all functional components are integrated in a simple valve body, greatly reduce the overall size and weight of the valve, the sealing is reliable and long in service life, adopts high -performance O ring or other forms of sealing element to carry out dynamic sealing to the piston, and the design is simple and reliable, can effectively prevent internal and external leakage.

Description

Technical Field

[0001] This utility model relates to the field of fluid pressure control equipment technology, and in particular to a single-stage piston pressure reducing valve. Background Technology

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. In modern industry, medical equipment, precision instruments, and portable devices, precise and stable control of fluid pressure is crucial, thus requiring miniature pressure reducing valves that are extremely small and lightweight.

[0003] Existing miniature pressure reducing valves have complex structures and poor sealing performance, making them prone to internal and external leakage, which affects pressure stability and service life.

[0004] Therefore, there is an urgent need for a single-stage piston pressure reducing valve to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a single-stage piston pressure reducing valve, which aims to solve the problems of existing miniature pressure reducing valves having complex structures, poor sealing performance, and being prone to internal and external leakage, thus affecting pressure stability and service life.

[0006] To achieve the above objectives, this utility model provides a single-stage piston pressure reducing valve, comprising an intake chamber, a spherical sealing ring, a steel ball, a retaining spring, an exhaust head, a front sealing ring, a rear sealing gasket, an intake piston component, and a pressure regulating assembly. The spherical sealing ring is connected to the exhaust head and located on the inner wall of the exhaust head. The steel ball is disposed on the inner wall of the intake chamber. The retaining spring is connected to both the steel ball and the intake chamber. The rear sealing gasket contacts both the intake chamber and the exhaust head. The front sealing ring is disposed on the side of the intake chamber away from the rear sealing gasket. The intake piston component is connected to the front sealing ring, the exhaust head, and the intake chamber. The pressure regulating assembly is connected to the intake piston component.

[0007] The intake piston assembly includes a main cavity and a ejector piston. The main cavity is rotatably connected to the exhaust head and located on the inner wall of the exhaust head. The main cavity is in contact with the front sealing ring. The main cavity is threadedly connected to the intake cavity and located on the inner wall of the intake cavity. The main cavity is in contact with the ball sealing ring. The ejector piston is slidably connected to the main cavity and located on the inner wall of the main cavity. The ejector piston is in contact with the steel ball.

[0008] The intake piston assembly further includes a pin seal ring, which is disposed on the outer side wall of the pin piston.

[0009] The pressure regulating assembly includes an adjusting sleeve, an adjusting pin, a locking nut, a pressure regulating spring, and a force transmitting sleeve. The adjusting sleeve is threadedly connected to the main cavity and located on the inner wall of the main cavity. The adjusting pin is rotatably connected to the adjusting sleeve and located on the inner wall of the adjusting sleeve. The force transmitting sleeve is slidably connected to the adjusting sleeve and located on the inner wall of the adjusting sleeve, and the force transmitting sleeve is in contact with the adjusting pin. One end of the pressure regulating spring is fixedly connected to the force transmitting sleeve, and the other end of the pressure regulating spring is connected to the ejector piston. The locking nut is threadedly connected to the adjusting pin and located on the outer wall of the adjusting pin, and the locking nut is in contact with the adjusting sleeve.

[0010] This utility model discloses a single-stage piston pressure reducing valve. The inlet chamber, the spherical sealing ring, the steel ball, and the retaining spring work together to ensure that the high-pressure gas entering the valve does not leak under different stress states. When the steel ball is subjected to external reaction force, it regulates the valve opening and closing, thus providing the precondition for high-pressure to low-pressure control. The spherical sealing ring is made of annular rubber, which, after deformation under pressure, forms an inlet channel with the mating parts for control. One end of the steel ball contacts the spherical sealing ring, and its center contacts the inlet piston. The inlet chamber is a corrosion-resistant metal cavity, providing installation conditions for air intake and components. Its end face has a standard threaded pipe that connects to the external high-pressure gas, forming a sealed and stable environment. The exhaust head is made of wear-resistant metal. The valve body has a front sealing ring and a rear sealing gasket at both ends, forming a sealing structure. After adjustment, the pressure-regulated target gas is discharged. The pressure regulating component is used to regulate the pressure input, and the inlet piston is used for pressure regulation and force transmission. It has high sealing performance. Through coaxial integrated design, all functional components are integrated into a simple valve body, which greatly reduces the overall size and weight of the valve. It is particularly suitable for miniaturized equipment with strict requirements on space and weight. It has fast dynamic response, good rigidity of piston structure, and direct force transmission. It can quickly respond to instantaneous changes in outlet pressure and achieve more stable pressure control. It has reliable sealing and long service life. It uses high-performance O-rings or other types of seals to dynamically seal the piston. The design is simple and reliable and can effectively prevent internal and external leakage. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the structure of the single-stage piston pressure reducing valve of this utility model.

[0013] Figure 2 This is an exploded view of the structure of the single-stage piston pressure reducing valve of this utility model.

[0014] 101-Intake chamber, 102-Spherical sealing ring, 103-Steel ball, 104-Retaining spring, 105-Exhaust head, 106-Front end sealing ring, 107-Rear end sealing gasket, 108-Main chamber, 109-Ejector piston, 110-Ejector sealing ring, 111-Adjusting sleeve, 112-Adjusting pin, 113-Locking nut, 114-Pressure adjusting spring, 115-Force transmission sleeve. Detailed Implementation

[0015] Please see Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the structure of the single-stage piston pressure reducing valve of this utility model. Figure 2 This is an exploded view of the structure of the single-stage piston pressure reducing valve of this utility model.

[0016] This utility model provides a single-stage piston pressure reducing valve, including an inlet chamber 101, a ball sealing ring 102, a steel ball 103, a retaining spring 104, an exhaust head 105, a front sealing ring 106, a rear sealing gasket 107, an inlet piston component, and a pressure regulating assembly. The inlet piston component includes a main chamber 108, a pin piston 109, and a pin sealing ring 110. The pressure regulating assembly includes an adjusting sleeve 111, an adjusting needle 112, a locking nut 113, a pressure regulating spring 114, and a force transmission sleeve 115.

[0017] The spherical sealing ring 102 is connected to the exhaust head 105 and is located on the inner sidewall of the exhaust head 105. The steel ball 103 is disposed on the inner sidewall of the air intake chamber 101. The retaining spring 104 is connected to the steel ball 103 and the air intake chamber 101 respectively. The rear sealing gasket 107 is in contact with the air intake chamber 101 and the exhaust head 105 respectively. The front sealing ring 106 is disposed on the side of the air intake chamber 101 away from the rear sealing gasket 107. The air intake piston is connected to the front sealing ring 106, the exhaust head 105 and the air intake chamber 101 respectively. The pressure regulating assembly is connected to the air intake piston.

[0018] In this embodiment, the cooperation of the air intake chamber 101, the spherical sealing ring 102, the steel ball 103, and the retaining spring 104 ensures that the high-pressure gas entering the chamber does not leak under different stress states. When the steel ball 103 is subjected to external reaction force, it functions to regulate the valve opening and closing, thereby providing the precondition for high-pressure to low-pressure regulation. The spherical sealing ring 102 is made of annular rubber material, which, after being deformed under pressure, forms an air intake channel with the mating parts for control. One end of the steel ball 103 contacts the spherical sealing ring 102, and its center position contacts the air intake piston. The air intake chamber 101 is a corrosion-resistant metal chamber that provides installation conditions for air intake and components. Its end face has a standard threaded pipe that connects to the external high-pressure gas to form a sealed and stable environment. The exhaust head... 105 is made of wear-resistant metal, with the front sealing ring 106 and the rear sealing gasket 107 respectively set at both ends to form a sealing structure. After adjustment, the pressure-regulated target gas is discharged. The pressure regulating component is used to regulate the pressure input, and the air intake piston is used for pressure regulation and force transmission. It has high sealing performance. Through coaxial integrated design, all functional components are integrated into a simple valve body, which greatly reduces the overall size and weight of the valve. It is particularly suitable for miniaturized equipment with strict requirements for space and weight. It has fast dynamic response, good rigidity of piston structure, and direct force transmission. It can quickly respond to instantaneous changes in outlet pressure and achieve more stable pressure control. It has reliable sealing and long service life. High-performance O-rings or other types of seals are used to dynamically seal the piston. The design is simple and reliable and can effectively prevent internal and external leakage.

[0019] The front sealing ring 106 is a rubber O-ring.

[0020] The rear sealing gasket 107 is a rubber O-ring.

[0021] Furthermore, the main cavity 108 is rotatably connected to the exhaust head 105 and located on the inner sidewall of the exhaust head 105, and the main cavity 108 is in contact with the front sealing ring 106. The main cavity 108 is threadedly connected to the air intake cavity 101 and located on the inner sidewall of the air intake cavity 101, and the main cavity 108 is in contact with the spherical sealing ring 102. The ejector piston 109 is slidably connected to the main cavity 108 and located on the inner sidewall of the main cavity 108, and the ejector piston 109 is in contact with the steel ball 103.

[0022] In this embodiment, the main cavity 108 is a corrosion-resistant metal cavity, one end of which is threadedly connected to the air intake cavity 101, and the other end is threadedly connected to the exhaust head 105. The ejector piston 109 is provided inside, which provides a channel for piston movement. The ejector piston 109 has a convex shape, is a cylindrical metal part, and has a groove reserved on the outer end face. The user installs the pressure regulating spring 114, whose small cylindrical needle-shaped structure is used to apply external force to the steel ball 103.

[0023] Furthermore, the ejector pin sealing ring 110 is disposed on the outer side wall of the ejector pin piston 109.

[0024] In this embodiment, the ejector piston 109 is a large cylindrical structure with a reserved groove for pre-embedding the ejector sealing ring 110. The rubber O-ring is used to seal the piston during its push-pull motion.

[0025] Furthermore, the adjusting sleeve 111 is threadedly connected to the main cavity 108 and located on the inner sidewall of the main cavity 108; the adjusting pin 112 is rotatably connected to the adjusting sleeve 111 and located on the inner sidewall of the adjusting sleeve 111; the force transmission sleeve 115 is slidably connected to the adjusting sleeve 111 and located on the inner sidewall of the adjusting sleeve 111, and the force transmission sleeve 115 is in contact with the adjusting pin 112; one end of the pressure adjusting spring 114 is fixedly connected to the force transmission sleeve 115; the other end of the pressure adjusting spring 114 is connected to the ejector piston 109; the locking nut 113 is threadedly connected to the adjusting pin 112 and located on the outer sidewall of the adjusting pin 112, and the locking nut 113 is in contact with the adjusting sleeve 111.

[0026] In this embodiment, the adjusting sleeve 111 is a corrosion-resistant metal mounting sleeve. One end of the sleeve provides a linear motion track for the pressure adjusting spring 114 and the force transmission sleeve 115, and the other end is fitted with the adjusting pin 112. The adjusting pin 112 is a rod with a tapered end. The tapered end contacts the force transmission sleeve 115. When it rotates clockwise, it achieves linear feed. The force transmission sleeve 115 compresses and squeezes the pressure adjusting spring 114. The locking nut 113 is installed on the adjusting pin 112 and is used to lock and fix the adjusting pin 112 after it rotates to a preset value. The pressure adjusting spring 114 is a compression spring. After receiving the pressure applied by the force transmission sleeve 115, it transmits the pressure to the ejector piston 109, thereby completing the force transmission.

[0027] The device in its initial state:

[0028] When the device is in its initial state, the adjusting needle 112 is first adjusted counterclockwise to the set position so that the air inlet is not restricted by the adjusting force. At this time, the device is in a free state. After the high-pressure gas enters the air inlet, the steel ball 103 is pressed tightly against the ball sealing ring 102 due to the elastic force of the retaining spring 104. The elastic force provided by the retaining spring 104 is equal to the thrust applied by the external gas, thereby forming a sealed air chamber. No gas is discharged from the exhaust head 105 and the air pressure is zero.

[0029] Voltage regulation and limiting process:

[0030] In the initial state, the user needs to adjust (depressurize) the initial gas by rotating the adjusting needle 112 counterclockwise. This causes the adjusting needle 112 to advance axially, compressing the force transmission sleeve 115. The force transmission sleeve 115 moves along the circumferential direction of the adjusting sleeve 111, compressing the pressure adjusting spring 114. The pressure adjusting spring 114 then applies its elastic force to the ejector piston 109. Similarly, the ejector spring transmits its elastic force to the steel ball 103. At this time, the steel ball 103 is subjected not only to the combined positive pressure of the external high-pressure gas (F1) and the holding spring 104 (F2), but also to the counter-pressure from the pressure adjusting spring 114 (F3). As the force is directed, the fit between the spherical sealing ring 102 and the steel ball 103 decreases, allowing high-pressure gas to enter the rear end through the gap, forming a low-pressure chamber. With varying degrees of counter-clockwise rotation of the adjusting needle 112, a series of forces are transmitted, causing changes in the flow path between the spherical sealing ring 102 and the steel ball 103, with the two being directly proportional. Since the rotational feed of the adjusting needle 112 is limited, and the displacement of the ejector piston 109 is also limited, when the adjusting needle 112 reaches its maximum feed value, the fit between the spherical sealing ring 102 and the steel ball 103 increases. Even in its maximum flow path state, the pressure in the low-pressure chamber will not be excessively high, thus achieving a pressure reduction and limiting effect.

[0031] dynamic equilibrium:

[0032] When using this device, the user presets a certain low-pressure range. At this time, the fluid pressure in the (low-pressure) main chamber will act on the flow-facing surface of the ejector piston 109, generating a thrust in the opposite direction to the pressure regulating spring 114.

[0033] When the exhaust port pressure rises above the set value, the fluid thrust acting on the ejector piston 109 exceeds the set force of the pressure regulating spring 114. The ejector piston 109 moves toward the spring. This movement causes the valve core to approach or even close the valve seat, reducing the opening of the intake passage and decreasing the flow rate into the low-pressure chamber, thereby causing the outlet pressure to drop until it returns to the set value.

[0034] When the outlet pressure drops (e.g., when the downstream equipment starts using gas) to below the set value, the fluid thrust acting on the piston is less than the set force of the pressure regulating spring 114. The spring pushes the piston to move towards the air inlet. This movement causes the valve core to move away from the valve seat, increasing the opening of the air inlet passage and increasing the flow rate into the low-pressure chamber, thereby raising the outlet pressure until it returns to the set value. Through such a closed-loop negative feedback regulation mechanism, the valve can automatically stabilize the outlet pressure near the set pressure value.

[0035] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments, and equivalent variations made in accordance with the claims of this application, still fall within the scope of this application.

Claims

1. A single-stage piston pressure reducing valve, characterized in that, The device includes an intake chamber, a spherical sealing ring, a steel ball, a retaining spring, an exhaust head, a front sealing ring, a rear sealing gasket, an intake piston, and a pressure regulating assembly. The spherical sealing ring is connected to the exhaust head and located on the inner wall of the exhaust head. The steel ball is disposed on the inner wall of the intake chamber. The retaining spring is connected to both the steel ball and the intake chamber. The rear sealing gasket contacts both the intake chamber and the exhaust head. The front sealing ring is disposed on the side of the intake chamber away from the rear sealing gasket. The intake piston is connected to the front sealing ring, the exhaust head, and the intake chamber. The pressure regulating assembly is connected to the intake piston.

2. The single-stage piston pressure reducing valve as described in claim 1, characterized in that, The intake piston assembly includes a main cavity and a ejector piston. The main cavity is rotatably connected to the exhaust head and located on the inner wall of the exhaust head. The main cavity is in contact with the front sealing ring. The main cavity is threadedly connected to the intake cavity and located on the inner wall of the intake cavity. The main cavity is in contact with the ball sealing ring. The ejector piston is slidably connected to the main cavity and located on the inner wall of the main cavity. The ejector piston is in contact with the steel ball.

3. The single-stage piston pressure reducing valve as described in claim 2, characterized in that, The intake piston assembly also includes a pin seal ring, which is disposed on the outer side wall of the pin piston.

4. The single-stage piston pressure reducing valve as described in claim 3, characterized in that, The pressure regulating assembly includes an adjusting sleeve, an adjusting pin, a locking nut, a pressure regulating spring, and a force transmitting sleeve. The adjusting sleeve is threadedly connected to the main cavity and is located on the inner wall of the main cavity. The adjusting pin is rotatably connected to the adjusting sleeve and is located on the inner wall of the adjusting sleeve. The force transmitting sleeve is slidably connected to the adjusting sleeve and is located on the inner wall of the adjusting sleeve, and the force transmitting sleeve is in contact with the adjusting pin. One end of the pressure regulating spring is fixedly connected to the force transmitting sleeve, and the other end of the pressure regulating spring is connected to the ejector piston. The locking nut is threadedly connected to the adjusting pin and is located on the outer wall of the adjusting pin, and the locking nut is in contact with the adjusting sleeve.

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