Two-stage pressure reducer

Abstract

The embodiment of the utility model relates to the technical field of pressure reducers, in particular to a two-stage pressure reducer which comprises a valve body, an inlet end and an outlet end, the inlet end and the outlet end are arranged on the valve body, a first-stage pressure reducing structure communicated with the inlet end is arranged in the valve body, and a second-stage pressure reducing structure communicated with the outlet end is further arranged in the valve body. The pressure reducer has the advantages that the first-stage pressure reducing structure is of a forward non-unloading action type structure and is suitable for general-purpose pressure reducers with small flow, low outlet pressure and low pressure stabilizing precision, and the second-stage pressure reducing structure is of a reverse unloading type structure and is suitable for medium-pressure, medium-flow and medium-precision pressure reducers; the pressure regulating device has the advantages that the pressure of a medium is reduced through the first-stage pressure reducing structure and the pressure of the medium is secondarily reduced and stabilized through the second-stage pressure reducing structure according to outlet pressure deviation caused by load reduction of the elastic element, so that the pressure regulating range is widened, and the pressure regulating precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducers, in particular to a two-stage pressure reducer. Background Art

[0002] With the rapid development of modern industrial technology, pressure reducers play an increasingly important role in various application scenarios; especially in the fields of gas control, fluid transmission and precision instruments, the performance of the pressure reducer directly affects the stability and efficiency of the entire system; At present, most of the pressure reducers widely used in the market adopt a single-pole pressure reduction structure. Although this structure can meet the basic pressure reduction needs to a certain extent, it has exposed many shortcomings in practical applications;

[0003] The main drawback of the single-pole pressure relief structure is that its pressure relief range is relatively small, making it difficult to adapt to the diverse needs of different scenarios. In situations where a large range of pressure relief is required, a pressure reducer of this structure often fails to achieve the desired pressure relief effect, thus affecting the performance of the entire system.

[0004] In addition, the pressure reduction accuracy of the unipolar pressure reducing structure is also poor, making it difficult to meet the requirements of high-precision control; in scenarios where precise control of gas or fluid pressure is required, the performance of this type of pressure reducer is often unsatisfactory and may even lead to system instability or failure.

[0005] Therefore, a two-stage pressure reducer is needed. By introducing additional pressure reduction levels, it can not only expand the pressure reduction range and improve the pressure reduction accuracy, but also better adapt to the needs of different application scenarios to overcome the occurrence of the above-mentioned problems. Utility Model Content

[0006] In order to solve the above problems, the embodiment of the utility model provides a two-stage pressure reducer, which achieves the purpose of solving the problems raised in the background technology.

[0007] In order to achieve the above-mentioned purpose, the embodiment of the utility model specifically adopts the following technical scheme: a two-stage pressure reducer, including a valve body, an inlet end and an outlet end arranged on the valve body, the interior of the valve body is provided with a first-stage pressure reducing structure connected to the inlet end, and the interior of the valve body is also provided with a second-stage pressure reducing structure connected to the outlet end; the first-stage pressure reducing structure includes a piston slidably arranged inside the valve body and matched with the inlet end, and a feedback unit 1 arranged inside the valve body for controlling the distance between the piston and the inlet end; the second-stage pressure reducing structure includes a valve assembly slidably arranged inside the valve body and connected to the outlet end, a boss arranged inside the valve body and used in conjunction with the valve assembly, and a feedback unit 2 arranged inside the valve body for controlling the distance between the valve assembly and the boss.

[0008] As a further improvement of the above technical solution:

[0009] The feedback unit 1 includes a spring 1 arranged inside the valve body for providing elastic force to the piston, and a chamber 1 opened at one end of the piston.

[0010] A channel is arranged between the chamber 1 and the valve assembly, and a throttle plate 1 is arranged inside the channel.

[0011] The feedback unit 2 includes a spring seat elastically slidably arranged inside the valve body through a spring 2, a non-metallic diaphragm fixedly connected to the spring seat, and a spring 3 arranged at one end of the valve assembly.

[0012] The non-metallic diaphragm and the valve body form chamber two, and the interior of the valve body is provided with chamber three which is connected with chamber two, and the chamber three is connected with the valve assembly, and the chamber three is connected with the outlet end.

[0013] The chamber 2 and the chamber 3 are connected through the throttle plate 2.

[0014] The valve body is provided with an adjusting component for adjusting the compression degree of the second spring.

[0015] The regulating assembly comprises an regulating seat which is slidably arranged inside the valve body and located at one end of the spring, and an regulating rod which is threadedly connected inside the valve body and rotatably arranged on one side of the regulating seat.

[0016] The beneficial effects of the embodiments of the utility model are:

[0017] The first-stage pressure reducing structure adopts a forward non-unloading structure, which is suitable for general-purpose pressure reducers with small flow, low outlet pressure and low pressure stabilization accuracy. It has a simple structure and light weight. In order to control the outlet pressure accuracy of the valve body, the second-stage pressure reducing structure adopts a reverse unloading structure, which is suitable for medium-pressure, medium-flow and medium-precision pressure reducers. Its advantage is that the outlet pressure deviation caused by the reduction of the load of the adjusting elastic element and the outlet pressure deviation caused by the reduction of the inlet pressure have a mutually weakening effect, and the pressure stabilization accuracy is relatively high. That is, the medium is decompressed by the first-stage pressure reducing structure, and the medium is decompressed and stabilized by the second-stage pressure reducing structure, thereby improving the range of pressure regulation and the accuracy of pressure regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0020] In the figure: 1. valve body; 2. primary pressure reducing structure; 21. piston; 22. feedback unit 1; 221. spring 1; 222. chamber 1; 3. secondary pressure reducing structure; 31. valve assembly; 32. boss; 33. feedback unit 2; 331. spring seat; 332. spring 2; 333. non-metallic diaphragm; 334. spring 3; 335. chamber 2; 336. chamber 3; 4. inlet end; 5. outlet end; 6. channel; 7. throttle plate 1; 8. throttle plate 2; 9. adjustment assembly; 91. adjustment seat; 92. adjustment rod. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0022] See also Figure 1 to Figure 2 The utility model discloses a two-stage pressure reducer, comprising a valve body 1, an inlet end 4 and an outlet end 5 arranged on the valve body 1, wherein the medium enters the valve body 1 through the inlet end 4, and the medium is discharged from the valve body 1 through the outlet end 5, and a first-stage pressure reducing structure 2 connected to the inlet end 4 is arranged inside the valve body 1, and a second-stage pressure reducing structure 3 connected to the outlet end 5 is also arranged inside the valve body 1;

[0023] The first-stage pressure reducing structure 2 includes a piston 21 which is slidably arranged inside the valve body 1 and matches with the inlet end 4, and a feedback unit 22 which is arranged inside the valve body 1 and is used to control the distance between the piston 21 and the inlet end 4;

[0024] The two-stage pressure reducing structure 3 includes a valve assembly 31 slidably disposed inside the valve body 1 and connected to the outlet end 5, a boss 32 disposed inside the valve body 1 and used in conjunction with the valve assembly 31, and a feedback unit 33 disposed inside the valve body 1 for controlling the distance between the valve assembly 31 and the boss 32;

[0025] The first-stage pressure reducing structure 2 adopts a forward non-unloading structure, which is suitable for general-purpose pressure reducers with small flow, low outlet pressure and low pressure stabilization accuracy, and has a simple structure and light weight. In order to control the outlet pressure accuracy of the valve body, the second-stage pressure reducing structure 3 adopts a reverse unloading structure, which is suitable for medium-pressure, medium-flow and medium-precision pressure reducers. The advantage is that the outlet pressure deviation caused by the reduction of the load of the adjusting elastic element and the outlet pressure deviation caused by the reduction of the inlet pressure have a mutually weakening effect, and the pressure stabilization accuracy is relatively high. That is, the medium is decompressed by the first-stage pressure reducing structure 2, and the medium is secondary decompressed and stabilized by the second-stage pressure reducing structure 3, thereby improving the range of pressure regulation and the accuracy of pressure regulation.

[0026] As a further illustration of this application:

[0027] The feedback unit 22 includes a spring 221 disposed inside the valve body 1 for providing elastic force to the piston 21, and a chamber 222 opened at one end of the piston 21;

[0028] Under normal conditions, spring 1221 pushes piston 21 to slide downward, so that there is a large distance between piston 21 and inlet end 4, so that medium enters valve body 1 through inlet end 4, and then enters chamber 122 through piston 21. A hole is provided on the side wall of chamber 122, and medium enters secondary pressure reducing structure 3 through the hole. When the pressure inside chamber 122 is high, piston 21 is pushed to slide upward, thereby reducing the distance between piston 21 and inlet end 4, reducing the amount of medium entering, thereby achieving the effect of pressure reduction and pressure stabilization.

[0029] As a further illustration of this application:

[0030] A channel 6 is provided between the chamber 1 222 and the valve assembly 31, and a throttle plate 1 7 is provided inside the channel 6; the medium inside the chamber 1 222 enters the valve assembly 31 through the channel 6, and the throttle plate 1 7 is provided on the channel 6 to reduce the flow rate of the medium, thereby facilitating stable control of the medium pressure.

[0031] As a further illustration of this application:

[0032] The feedback unit 2 33 includes a spring seat 331 elastically slidably arranged inside the valve body 1 through a spring 2 332, a non-metallic diaphragm 333 fixedly connected to the spring seat 331, and a spring 334 arranged at one end of the valve assembly 31; the non-metallic diaphragm 333 and the valve body 1 form a chamber 2 335, and a chamber 3 336 connected to the chamber 2 335 is arranged inside the valve body 1, the chamber 3 336 is connected to the valve assembly 31, and the chamber 3 336 is connected to the outlet end 5;

[0033] Under normal conditions, the pressure of spring two 332 is greater than the pressure of spring three 334, causing the valve assembly 31 to move downward, thereby creating a larger gap between the valve assembly 31 and the boss 32, allowing the medium to enter the valve assembly 31, and then the medium flows into chamber three 336. Part of the medium in chamber three 336 is discharged through the outlet port 5, and the other part enters chamber two 335. When the medium pressure inside chamber two 335 is relatively high, the spring seat 331 is pushed to move upward, causing the valve assembly 31 to move upward under the action of spring three 334, and then the gap between the valve assembly 31 and the boss 32 is reduced, thereby reducing the amount of medium entering, achieving the effects of pressure reduction and pressure stabilization.

[0034] As a further illustration of this application:

[0035] Chamber two 335 and chamber three 336 are connected through throttle plate two 8, which reduces the flow rate of the medium from chamber three 336 into chamber two 335, so that there is a certain time difference in pressure change between chamber two 335 and chamber three 336, thereby increasing the overall response speed and improving the pressure stabilization effect.

[0036] As a further illustration of this application:

[0037] The valve body 1 is provided with an adjusting component 9 for adjusting the compression degree of the second spring 332. The compression degree of the second spring 332 is adjusted by the adjusting component 9. When the compression degree of the second spring 332 is large, a large medium pressure is required in the second chamber 335 to push the spring seat 331 to move.

[0038] As a further illustration of this application:

[0039] The adjusting assembly 9 includes an adjusting seat 91 which is slidably arranged inside the valve body 1 and located at one end of the spring 2 332, and an adjusting rod 92 which is threadedly connected inside the valve body 1 and rotatably arranged on one side of the adjusting seat 91. After rotating the adjusting rod 92, the adjusting seat 91 slides inside the valve body 1, thereby changing the distance between the adjusting seat 91 and the spring seat 331, and then changing the compression degree of the spring 2 332.

[0040] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0043] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A two-stage pressure reducer, characterized in that: The valve body (1) comprises an inlet end (4) and an outlet end (5) arranged on the valve body (1); a primary pressure reducing structure (2) connected to the inlet end (4) is arranged inside the valve body (1); and a secondary pressure reducing structure (3) connected to the outlet end (5) is also arranged inside the valve body (1); The first-stage pressure reducing structure (2) comprises a piston (21) slidably arranged inside the valve body (1) and matched with the inlet end (4), and a feedback unit (22) arranged inside the valve body (1) for controlling the distance between the piston (21) and the inlet end (4); The two-stage pressure reducing structure (3) comprises a valve assembly (31) slidably arranged inside the valve body (1) and connected to the outlet end (5), a boss (32) arranged inside the valve body (1) and used in conjunction with the valve assembly (31), and a feedback unit 2 (33) arranged inside the valve body (1) and used to control the distance between the valve assembly (31) and the boss (32).

2. The two-stage pressure reducer according to claim 1, characterized in that: The feedback unit (22) comprises a spring (221) arranged inside the valve body (1) for providing elastic force to the piston (21), and a chamber (222) opened at one end of the piston (21).

3. The two-stage pressure reducer according to claim 2, characterized in that: A channel (6) is provided between the chamber one (222) and the valve assembly (31), and a throttle plate one (7) is provided inside the channel (6).

4. The two-stage pressure reducer according to claim 1, characterized in that: The feedback unit 2 (33) comprises a spring seat (331) elastically slidably arranged inside the valve body (1) via a spring 2 (332), a non-metallic diaphragm (333) fixedly connected to the spring seat (331), and a spring 3 (334) arranged at one end of the valve assembly (31).

5. The two-stage pressure reducer according to claim 4, characterized in that: The non-metallic diaphragm (333) and the valve body (1) form chamber two (335), and the interior of the valve body (1) is provided with chamber three (336) which is connected to chamber two (335), and the chamber three (336) is connected to the valve assembly (31), and the chamber three (336) is connected to the outlet end (5).

6. The two-stage pressure reducer according to claim 5, characterized in that: The chamber 2 (335) and the chamber 3 (336) are connected via the throttle plate 2 (8).

7. The two-stage pressure reducer according to claim 4, characterized in that: The valve body (1) is provided with an adjustment component (9) for adjusting the degree of compression of the second spring (332).

8. The two-stage pressure reducer according to claim 7, characterized in that: The adjustment assembly (9) comprises an adjustment seat (91) which is slidably arranged inside the valve body (1) and located at one end of the second spring (332), and an adjustment rod (92) which is threadedly connected to the inside of the valve body (1) and rotatably arranged on one side of the adjustment seat (91).

Images