Pneumatic regulating valve

Abstract

The utility model discloses a pneumatic governing valve, including valve body, valve core, valve stem, shell and executing mechanism, and executing mechanism includes diaphragm, push rod and spring assembly, and spring assembly is constituted by one or more parallel compression spring, and the accurate guide cooperation of push rod's guide surface and the shaft sleeve is formed, and at least one O type sealing ring is arranged between the shaft sleeve and push rod, the utility model mainly carries out improvement to the problems, such as big structure height, high return difference, complex sealing and inconvenient assembly of existing governing valve, adopts the combination compression spring of multiple parallel to replace single spring to reduce structure height, and the accurate machining of high hardness, low roughness is carried out to push rod guide surface and the shaft sleeve to reduce friction and abrasion, reduce return difference, and the governing valve has eliminated spring pre -tightening force adjusting mechanism, has realized " once installs into ", has reduced the trouble of assembly and debugging link, has also reduced the trouble risk of causing due to improper adjustment.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to a pneumatic regulating valve. Background Technology

[0002] Pneumatic control valves are key actuators in industrial automation control systems, and their performance directly affects the regulation accuracy and stability of the entire control system. Traditional pneumatic control valves typically use a single large-size compression spring to provide the reset force or achieve specific force characteristics. This structure has the following drawbacks: First, to provide sufficient force, the single spring has a long free length and compression stroke, resulting in a large overall height of the valve actuator, which is not conducive to installation in compact spaces. Second, the fit clearance, surface roughness, and hardness between the push rod and the guide sleeve are insufficient, which easily leads to wear after long-term reciprocating motion, resulting in increased mechanical clearance and thus causing significant hysteresis, reducing control accuracy. Third, traditional stuffing box seals or multiple seal structures are relatively complex, cumbersome to assemble and adjust, and pose a risk of leakage.

[0003] Based on the above-mentioned technical problems, those skilled in the art urgently need to develop a pneumatic control valve that is compact in structure, has low hysteresis, reliable in sealing, and is easy to assemble. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic control valve that is compact in structure, has low hysteresis, reliable sealing, and is easy to assemble.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a pneumatic regulating valve, which includes a valve body, a valve core, a valve stem, a housing, and an actuator, wherein the actuator includes a diaphragm, a push rod, and a spring assembly.

[0007] The spring assembly consists of one or more compression springs connected in parallel;

[0008] The pneumatic control valve also includes:

[0009] The bushing and the guide surface of the push rod form a precision guide fit with the bushing to enable the push rod to reciprocate up and down within the housing, and at least one O-ring is provided between the bushing and the push rod.

[0010] Preferably, the multiple compression springs are evenly distributed around the axis of the push rod.

[0011] Preferably, the guide surface hardness of the push rod is not lower than HRC55, and the surface roughness Ra value is not higher than 0.4μm.

[0012] Preferably, the O-ring is installed in a sealing groove on the bushing.

[0013] Preferably, the compression spring is positioned and supported by a fixedly installed upper spring seat and a lower spring seat.

[0014] The pneumatic regulating valve provided by this utility model, as described above, has the following beneficial effects:

[0015] This utility model discloses a pneumatic regulating valve that, by employing multiple parallel small springs, effectively reduces the height of the actuator while ensuring the required thrust, making it easy to install and arrange in confined spaces.

[0016] The high hardness and low roughness treatment of the push rod guide surface greatly reduces the friction and wear of the moving parts, making the valve stem action more sensitive and precise, effectively reducing hysteresis and improving the adjustment accuracy of the entire control system.

[0017] This regulating valve eliminates the need for a spring preload adjustment mechanism, achieving "one-time assembly," reducing the hassle of assembly and debugging, lowering production costs, improving production efficiency, and also reducing the risk of malfunctions caused by improper adjustment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure of a pneumatic regulating valve provided in an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of multiple compression springs in a pneumatic regulating valve provided for an embodiment of this utility model;

[0021] Figure 3 This is a diagram showing the positional distribution of multiple compression springs in a pneumatic regulating valve, provided as an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Diaphragm; 2. Push rod; 3. Compression spring; 4. Bushing; 5. Upper spring seat; 6. Lower spring seat; 7. Housing. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] See Figures 1-3 As shown;

[0026] The present invention provides a pneumatic regulating valve, comprising a valve body, a valve core, a valve stem, a housing 7, and an actuator, wherein the actuator comprises a diaphragm 1, a push rod 2, and a spring assembly;

[0027] The spring assembly consists of one or more compression springs 3 connected in parallel;

[0028] The pneumatic control valve also includes:

[0029] The bushing 4 forms a precision guide fit with the guide surface of the push rod 2 to enable the push rod 2 to reciprocate up and down within the housing 7. At least one O-ring is provided between the bushing 4 and the push rod 2. The bushing 4 is press-fitted or fixedly installed on the housing 7.

[0030] As a preferred technical solution in this embodiment, multiple compression springs 3 are evenly distributed around the axis of the push rod 2.

[0031] As a preferred technical solution in this embodiment, the guide section surface of the push rod 2 undergoes heat treatment processes such as quenching to achieve a hardness of HRC55 or higher, and is ground to achieve a surface roughness Ra value of less than 0.4μm. The inner hole surface of the bushing 4 that mates with it is also hardened and precision ground to ensure a small clearance and low coefficient of friction between the two.

[0032] As a preferred technical solution in this embodiment, an annular groove is formed on the bushing 4, and an O-ring is installed in the groove. The O-ring is in close contact with the precision-machined surface of the push rod 2, forming a reliable dynamic seal.

[0033] As a preferred technical solution in this embodiment, four small-diameter compression springs 3 are evenly distributed around the push rod 2. The upper ends of these compression springs 3 rest on the upper spring seat 5, and the lower ends rest on the lower spring seat 6. The upper spring seat 5 and the lower spring seat 6 are simple flat plate structures, positioned by the housing 7 or other fixed structures, eliminating the need for a threaded adjustment device.

[0034] Assembly process: During assembly, first insert the O-ring into the groove of the bushing 4, then press the bushing 4 into the housing 7. Next, pass the push rod 2 through the bushing 4, install the lower spring seat 6, insert the four compression springs 3, then cover with the upper spring seat 5, and finally press and fix the entire assembly using the housing cover. Because the spring force values ​​are precisely calculated and matched, after pressing the cover, the spring assembly is in the predetermined working compression state, requiring no further adjustment; the assembly is completed in one step.

[0035] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pneumatic regulating valve, comprising a valve body, a valve core, a valve stem, a housing (7), and an actuator, wherein the actuator comprises a diaphragm (1), a push rod (2), and a spring assembly, characterized in that: The spring assembly consists of one or more compression springs (3) connected in parallel; The pneumatic control valve also includes: The bushing (4) and the guide surface of the push rod (2) form a precision guide fit with the bushing (4) to realize the push rod (2) to move up and down in the housing (7), and at least one O-ring is provided between the bushing (4) and the push rod (2).

2. The pneumatic regulating valve according to claim 1, characterized in that, Multiple compression springs (3) are evenly distributed around the axis of the push rod (2).

3. A pneumatic regulating valve according to claim 1, characterized in that, The guide surface hardness of the push rod (2) is not lower than HRC55, and the surface roughness Ra value is not higher than 0.4μm.

4. A pneumatic regulating valve according to claim 1, characterized in that, The O-ring is installed in the sealing groove opened on the bushing (4).

5. A pneumatic regulating valve according to any one of claims 1 to 4, characterized in that, The compression spring (3) is positioned and supported by the fixedly installed upper spring seat (5) and lower spring seat (6).

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