Centrifugal compressor inlet pressure regulating valve

Abstract

The utility model discloses the technical field of compressor parts provides a centrifugal compressor air intake pressure regulating valve, including centrifugal compressor, the motor of drive centrifugal compressor operation, the frequency conversion speed regulation box of adjusting compressor rotating speed, and the guide vane valve of control centrifugal compressor air intake and with centrifugal compressor air intake connection, the utility model overcomes the deficiency of prior art, has adopted the transmission mode of the gear of involute tooth shape and rack meshing, the rotation of lock nut makes the straight line motion of the lever along the recess, and the movement of the lever drives the rack to make the rotation of the blade along the position limiting rod position, and further realizes the opening or closing of blade, effectively avoids the over regulation phenomenon of regulation lag, realizes the high accuracy linear control to the air intake, thereby and frequency conversion speed regulation system better synergic work, ensures that compressor is always in the high -efficient interval stable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of compressor parts, specifically to an intake pressure regulating valve for a centrifugal compressor. Background Technology

[0002] Centrifugal compressors are widely used industrial equipment, and their operating efficiency and stability are crucial to the entire system. In actual operation, it is often necessary to adjust the compressor's intake air volume according to load changes to achieve energy saving, consumption reduction, and stable operating conditions. The guide vane valve is a key component for controlling the intake air volume of a centrifugal compressor, and its performance directly affects the compressor's surge boundary, operating efficiency, and adjustment range.

[0003] Traditional centrifugal compressor guide vane valves typically employ a simple linkage mechanism to drive the vanes to rotate, thereby altering the cross-sectional area of ​​the intake passage. However, these traditional structures have several drawbacks: First, the vane rotation is often not precise or smooth enough, potentially leading to lag or over-adjustment, affecting the stable operation of the compressor; second, the sealing and dynamic balance between the vanes and the valve body are poor, easily causing leakage and vibration, reducing overall efficiency and service life; furthermore, the locking and adjusting mechanisms of many traditional guide vane valves are complex, making installation, debugging, and maintenance inconvenient.

[0004] In response to the aforementioned problems, we propose an intake pressure regulating valve for centrifugal compressors. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a centrifugal compressor intake pressure regulating valve to solve the above-mentioned problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A centrifugal compressor inlet pressure regulating valve includes a centrifugal compressor, a motor that drives the centrifugal compressor, a variable frequency speed control box for adjusting the compressor speed, and a guide vane valve that controls the intake volume of the centrifugal compressor and is connected to the intake port of the centrifugal compressor.

[0008] The guide vane valve includes a valve body, a locking nut fitted on the valve body and threadedly engaged with the valve body, and a vane disposed within the valve body. Multiple vanes are provided along the inner wall of the valve body, and the vanes are provided with teeth near the inner wall of the valve body. The teeth are located in positioning grooves provided in the valve body. Each vane is provided with a spring, and the two ends of the spring are provided with movable limiting rods that engage with the positioning grooves.

[0009] The valve body is provided with a guide groove that communicates with the positioning groove. A rack that meshes with the teeth is provided in the guide groove. The outer surface of the valve body is provided with a groove that communicates with the positioning groove. A lever that is fixedly connected to the rack is provided in the groove. The lever extends a certain distance beyond the outer surface of the valve body and contacts the side of the nut.

[0010] Furthermore, the guide vane valve is sealed to the inlet flange via a bolt assembly; the teeth are involute teeth.

[0011] Furthermore, the blades are fan-shaped, and multiple blades form a circle.

[0012] Furthermore, the spring is clearance-fitted with the blade, and the limiting rod is placed inside the blade and slides with the blade.

[0013] Furthermore, the guide groove and recess are parallel to the axis of the valve body.

[0014] Furthermore, the rack is placed in the guide groove and recess and is clearance-fitted with them; the lever is perpendicular to the rack.

[0015] This utility model provides an intake pressure regulating valve for a centrifugal compressor. It offers the following advantages: It employs a transmission method involving the meshing of involute teeth and a rack. The rotation of the locking nut causes a lever to move linearly along a groove. The movement of the lever causes the rack to rotate along a limit rod, thus opening or closing the blades. This effectively avoids over-adjustment due to lag, achieving high-precision linear control of the intake air volume. This allows for better coordination with the variable frequency speed control system, ensuring the compressor always operates stably within its high-efficiency range.

[0016] The teeth on the blades move within the positioning grooves of the valve body, and the limiting rod also engages with the slide groove, constraining the movement trajectory of the blades so that they can only perform preset rotational movements without radial movement. This significantly improves dynamic balance, reduces operating vibration and noise, and extends service life.

[0017] Multiple blades are driven synchronously by a rack and pinion, which simplifies the control logic. All blades can be controlled by simply operating the position of the lever, making the mechanism more reliable and reducing the number of potential failure points. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is a three-dimensional schematic diagram of the guide vane valve of this utility model;

[0020] Figure 3 This is a cross-sectional view of the guide groove of the guide vane valve of this utility model;

[0021] Figure 4This is a cross-sectional view of the blade of this utility model;

[0022] Figure 5 This is a partial schematic diagram of the limiting rod of this utility model;

[0023] Figure 6 This is a cross-sectional view of the guide vane valve of this utility model;

[0024] Figure 7 This is a schematic diagram of the rack and blade assembly of this utility model;

[0025] Figure 8 This is a schematic diagram of the main view of the guide vane valve of this utility model;

[0026] In the diagram: 1. Centrifugal compressor; 2. Variable frequency speed control box; 3. Motor; 4. Guide vane valve; 41. Valve body; 42. Blade; 43. Locking nut; 44. Lever; 45. Rack; 46. Limiting rod; 47. Spring; 421. Tooth; 412. Thread; 413. Guide groove; 414. Groove; 411. Positioning groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] See attached document Figures 1-8 A centrifugal compressor intake pressure regulating valve includes a centrifugal compressor 1, a motor 3 that drives the centrifugal compressor 1, a variable frequency speed control box 2 that adjusts the compressor speed, and a guide vane valve 4 that controls the intake volume of the centrifugal compressor 1 and is connected to the intake port of the centrifugal compressor 1.

[0029] The guide vane valve 4 includes a valve body 41, a locking nut 43 fitted onto the valve body 41 and engaging with a thread 412 on the valve body 41, and a vane 42 disposed within the valve body 41. Multiple vanes 42 are provided along the inner wall of the valve body 41. The vanes 42 are provided with teeth 421 near the inner wall of the valve body 41. The teeth 421 are located within a positioning groove 411 provided in the valve body 41. Each vane 42 is provided with a spring 47. The two ends of the spring 47 are provided with movable limiting rods 46 that engage with the positioning groove 411.

[0030] The valve body 41 is provided with a guide groove 413 that communicates with the positioning groove 411. A rack 45 that meshes with the teeth 421 is provided in the guide groove 413. A groove 414 is provided on the outer surface of the valve body 41. The groove 414 communicates with the positioning groove 411. A lever 44 that is fixedly connected to the rack 45 is provided in the groove 414. The lever 44 extends a distance beyond the outer surface of the valve body 41 and contacts the side of the nut.

[0031] The guide vane valve 4 is sealed to the air inlet flange by a bolt assembly; the tooth 421 is an involute tooth 421 shape.

[0032] The blades 42 are fan-shaped, and multiple blades 42 form a circle.

[0033] The spring 47 is fitted with the blade 42 with a clearance, and the limiting rod 46 is placed inside the blade 42 and is slidably fitted with the blade 42.

[0034] The guide groove 413 and the groove 414 are parallel to the axis of the valve body 41.

[0035] The rack 45 is placed in the guide groove 413 and the recess 414 and is fitted with them with clearance; the lever 44 is perpendicular to the rack 45.

[0036] Working principle: When the operator rotates the locking nut 43, the side of the nut pushes the lever 44 to produce a linear displacement along the groove 414 and guide groove 413 parallel to the axis of the valve body 41. The lever 44 converts the linear motion into rotational motion through the fixedly connected rack 45. The rack 45 meshes with the involute teeth 421 on the blade 42, driving the blade 42 to rotate around its own central axis.

[0037] During the adjustment process, the limiting rod 46 in the positioning groove 411 constrains the movement trajectory of the blade 42, ensuring that it only performs pure rotational motion without radial displacement. The spring 47 group provides preload force to the limiting rod 46, so that the blade 42 and the inner wall of the valve body 41 maintain a dynamic seal. When the lever 44 moves by 5mm, all blades 42 open / close at an angle of ±15° simultaneously, achieving linear adjustment of the intake section.

[0038] During adjustment, the involute meshing characteristics of the rack 45 and the tooth 421 ensure the smoothness of motion transmission and avoid the impact phenomenon that may occur in traditional spur gear 421 transmission. The circular structure composed of multiple blades 42 maintains dynamic balance during adjustment, and the vibration amplitude is controlled within 0.02mm, which meets the requirements of the compressor intake adjustment mechanism.

[0039] By adjusting the position of the blade 42, the gas flow rate entering the centrifugal compressor 1 is controlled, thereby adjusting the output pressure and flow rate of the compressor; by adjusting the intake volume, the output pressure of the compressor is indirectly controlled to meet the needs under different working conditions. The cooperation of the spring 47 and the limit rod 46 ensures that the blade 42 remains stable during movement, avoiding damage caused by vibration or impact.

[0040] Manual or automatic adjustment can be achieved through lever 44 or an external control system, improving the flexibility and automation of operation; guide vane valve 4, as the adjustment component of the air inlet, is connected to the air inlet of centrifugal compressor 1, together forming the air inlet system of the compressor.

[0041] By adjusting the opening of the guide vane valve 4, the load on the compressor can be indirectly adjusted, thereby controlling the operating status of the compressor; the motor 3 drives the centrifugal compressor 1 to operate, and the adjustment of the guide vane valve 4 can optimize the operating efficiency and energy consumption of the compressor.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A centrifugal compressor inlet pressure regulating valve, comprising a centrifugal compressor, a motor for driving the centrifugal compressor, a variable frequency speed control box for adjusting the compressor speed, and a guide vane valve for controlling the intake volume of the centrifugal compressor and connected to the intake port of the centrifugal compressor; Its features are, The guide vane valve includes a valve body, a locking nut fitted on the valve body and threadedly engaged with the valve body, and a vane disposed within the valve body. Multiple vanes are provided along the inner wall of the valve body, and the vanes are provided with teeth near the inner wall of the valve body. The teeth are located in positioning grooves provided in the valve body. Each vane is provided with a spring, and the two ends of the spring are provided with movable limiting rods that engage with the positioning grooves. The valve body is provided with a guide groove that communicates with the positioning groove. A rack that meshes with the teeth is provided in the guide groove. The outer surface of the valve body is provided with a groove that communicates with the positioning groove. A lever that is fixedly connected to the rack is provided in the groove. The lever extends a certain distance beyond the outer surface of the valve body and contacts the side of the nut.

2. The centrifugal compressor inlet pressure regulating valve as described in claim 1, characterized in that: The guide vane valve is sealed to the inlet flange via a bolt assembly; the teeth are involute teeth.

3. The centrifugal compressor inlet pressure regulating valve as described in claim 1, characterized in that: The blades are fan-shaped, and multiple blades form a circle.

4. The centrifugal compressor inlet pressure regulating valve as described in claim 1, characterized in that: The spring is fitted with the blade with a clearance, and the limiting rod is placed inside the blade and slides with the blade.

5. The centrifugal compressor inlet pressure regulating valve as described in claim 1, characterized in that: The guide groove and recess are parallel to the axis of the valve body.

6. The centrifugal compressor inlet pressure regulating valve as described in claim 1, characterized in that: The rack is placed in the guide groove and recess and is fitted with them with clearance; the lever is perpendicular to the rack.

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