A throttle device and method for an exhaust system of a compressor test stand
The throttling device, composed of internal and external gear ring assemblies and lead screws, solves the problems of complex structure and high cost of traditional throttling devices, and achieves flexible adjustment and low-cost throttling effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING AVIATION FEIFANG MACHINERY EQUIP FACTORY
- Filing Date
- 2023-11-15
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional mechanical throttling devices are complex in structure, inflexible in adjustment, and prone to wear, while electric and hydraulic throttling devices are expensive to manufacture and operate.
The throttling device consists of an inner and outer gear ring assembly, a lead screw, a guide rod, a stepper motor, gears, and a chain. By rotating the lead screw, the inner and outer gear ring assembly is driven to adjust the airflow channel area, thereby achieving flexible flow control and avoiding the use of complex control systems and additional hydraulic or pneumatic systems.
It achieves a simple and reliable structure, flexible adjustment of flow rate, and low cost, reducing maintenance and usage costs.
Smart Images
Figure CN117404476B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of compressor technology, specifically relating to a throttling device and method for the exhaust system of a compressor test bench. Background Technology
[0002] In the field of compressors, pumps, or fans, regulating the outlet pressure of test specimens is a common requirement. To achieve this, a throttling device is typically installed in the exhaust system.
[0003] Traditional throttling devices typically employ mechanical mechanisms such as valves and gates, but these mechanisms suffer from drawbacks such as complex structure, inflexible adjustment, and susceptibility to wear. Therefore, a novel throttling device is needed to address these issues.
[0004] Currently, some novel throttling devices exist. For example, some patent applications use electric valves or solenoid valves to control the throttling flow. However, these electric devices typically require complex control systems and high-precision position control, resulting in high costs. Additionally, some patents use hydraulic or pneumatically controlled throttling devices, but these require additional hydraulic or pneumatic systems, leading to higher installation and maintenance costs. Existing technology problems: Traditional mechanical throttling devices suffer from complex structures, inflexible adjustments, and susceptibility to wear. Electric and hydraulically controlled throttling devices, on the other hand, suffer from high costs and operating expenses. Summary of the Invention
[0005] The purpose of this invention is to address the problems existing in the prior art by proposing a throttling device and method for the exhaust system of a compressor test bench. This device not only has a simple and reliable structure, but also allows for flexible adjustment of the throttling flow rate and has a lower operating cost.
[0006] Technical solution of the present invention: In order to achieve the above objective, according to the first aspect of the present invention, a throttling device for the exhaust system of a compressor test bench is proposed. The exhaust system of the compressor test bench includes an exhaust pipe (5) and an exhaust volute (1). One end of the exhaust pipe (5) with an outlet extends into the exhaust volute. The end of the exhaust pipe with an outlet is flared, and the outlet is circumferentially located at this end. The throttling device includes an inner and outer gear ring assembly (4) and a lead screw (6). The inner and outer gear ring assembly (4) is fitted at the outlet of the exhaust pipe. One end of the assembly has a flange, and a nut is circumferentially fixed on the flange. The nut is connected to the lead screw (6) which axially penetrates the exhaust volute (1). The two ends of the lead screw guide rod (2) axially penetrate the exhaust volute (1). By rotating the lead screw (6) through one end of the exhaust volute (1), the inner and outer gear ring assembly (4) is driven to move along the direction of the lead screw (6) to adjust the airflow channel area of the outlet of the exhaust pipe (5).
[0007] In one possible embodiment, a drive unit is also included, which includes a sprocket (9), a chain (7), and a motor (8). The sprocket (9) is fixedly mounted on one end of the lead screw (6) that passes through the exhaust volute (1). The chain (7) is mounted on the sprocket (9). The motor (8) is fixed to the outer end face of the exhaust volute (1). The motor (8) is connected to the chain (7) for driving the chain (7) to move, thereby driving the sprocket (9) to rotate, and further driving the inner and outer toothed ring assembly (4) to move along the direction of the lead screw (6) to adjust the airflow channel area of the exhaust pipe (5) outlet.
[0008] In one possible embodiment, a limit switch (3) is also included, which is disposed on the lead screw (6) for limiting the linear movement range of the inner and outer gear ring assembly (4).
[0009] In one possible embodiment, the lead screw (6) comprises at least three sets of gears evenly arranged circumferentially along the inner and outer toothed ring assemblies (4) of the outer sleeve (1).
[0010] In one possible embodiment, a lead screw guide rod (2) is also included, which comprises multiple sets and is evenly arranged between the lead screws (6); the chain (5) is tensioned by passing around the end of the linear guide rail (7).
[0011] In one possible embodiment, the lead screw (6) is provided with limit stops at both ends of the exhaust volute (1) to prevent the lead screw (6) from coming out.
[0012] In one possible embodiment, the lead screw guide rod (2) passes through the exhaust volute (1) and is provided with limit stops at both ends.
[0013] According to a second aspect of the present invention, a compressor test bench exhaust system is provided, comprising the above-described compressor test bench exhaust system throttling device.
[0014] According to a third aspect of the present invention, a throttling method for the exhaust system of a compressor test bench is provided, employing the aforementioned throttling device for the exhaust system of a compressor test bench, comprising the following steps:
[0015] Step 1: Before the test, check that the gap between the inner and outer toothed ring assemblies (4) is in a state of mutual circumferential obstruction, and move the inner and outer toothed ring assemblies (4) to the outer edge of the compressor exhaust channel.
[0016] Step 2: First, adjust the compressor to the test operating speed, remotely control the motor (8) and drive the inner and outer gear ring assembly (4) to move along the horizontal axis through the sprocket (9), chain (7) and lead screw (6), thereby changing the area of the compressor guide diffuser.
[0017] Step 3: The axial movement distance of the inner and outer gear ring assembly (4) shall not exceed 1% of the full range each time. Adjust linearly and observe the compressor outlet pressure in real time.
[0018] Step 4: When the compressor outlet pressure reaches the required pressure, stop the axial movement of the inner and outer gear ring assembly (4). After the state stabilizes, measure the compressor outlet pressure, flow rate, and temperature parameters.
[0019] Step 5: When the compressor outlet pressure gradually increases and approaches the stall point, the axial movement distance of the inner and outer gear ring assemblies (4) shall not exceed 0.25% of the full range each time; to avoid the compressor entering a surge state and damaging the compressor and test equipment;
[0020] Step 6: Repeat steps 2-5 to achieve different pressure ratios and obtain constant speed curves.
[0021] The beneficial effects of this invention are:
[0022] 1. Simple and Reliable Structure: This invention employs components such as an internal gear ring, an external gear ring, a lead screw, a guide rod, a stepper motor, gears, and a chain. Compared to traditional mechanical throttling devices, its structure is simpler and more reliable, reducing easily worn parts and lowering maintenance costs. 2. Flexible Adjustment: This invention uses a stepper motor to drive the internal and external gear rings to move horizontally, adjusting the throttling flow rate by changing the outlet flow area of the diffuser in the shielded test piece. Compared to electric valves or solenoid valves using complex control systems and high-precision position control, this invention offers more flexible adjustment and eliminates the need for additional hydraulic or pneumatic systems. 3. Lower Cost: The invention's simple structure eliminates the need for complex control systems and high-precision position control, and also eliminates the need for additional hydraulic or pneumatic systems, resulting in lower costs and greater economic practicality. Therefore, compared to existing technologies such as traditional mechanical throttling devices, electric valves or solenoid valves, and hydraulically or pneumatically controlled throttling devices, this invention offers advantages such as simple and reliable structure, flexible adjustment, and lower cost. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.
[0024] Figure 2 This is a side view of the present invention. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0026] Example 1
[0027] According to a first aspect of the present invention, a throttling device for the exhaust system of a compressor test bench is provided, such as... Figure 1As shown, the exhaust system of the compressor test bench includes an exhaust pipe (5) and an exhaust volute (1); the exhaust pipe (5) has an outlet end that extends into the exhaust volute, and the outlet end of the exhaust pipe is flared, with the outlet circumferentially located at this end; the throttling device includes an inner and outer gear ring assembly (4) and a lead screw (6); the inner and outer gear ring assembly (4) is fitted onto the outlet of the exhaust pipe, and one end of it has a flange, with a nut circumferentially fixed to the flange, which is connected to the lead screw (6) axially penetrating the exhaust volute (1) through the nut; the two ends of the lead screw guide rod (2) axially penetrate the exhaust volute (1), and by rotating the lead screw (6) through one end of the exhaust volute (1), the inner and outer gear ring assembly (4) is driven to move along the direction of the lead screw (6) to adjust the airflow channel area of the outlet of the exhaust pipe (5).
[0028] like Figure 2 As shown, it also includes a drive unit, which includes a sprocket (9), a chain (7), and a motor (8); the sprocket (9) is fixedly mounted on one end of the lead screw (6) that passes through the exhaust volute (1), the chain (7) is mounted on the sprocket (9), and the motor (8) is fixed on the outer end face of the exhaust volute (1). The motor (8) is connected to the chain (7) for driving the chain (7) to move, thereby driving the sprocket (9) to rotate, and further driving the inner and outer toothed ring assembly (4) to move along the direction of the lead screw (6) to adjust the airflow channel area of the exhaust pipe (5) outlet.
[0029] It also includes a limit switch (3), which is disposed on the lead screw (6) and is used to limit the linear movement range of the inner and outer gear ring assembly (4).
[0030] The lead screw (6) includes at least 3 sets, which are evenly arranged circumferentially along the outer sleeve (1) and the inner and outer toothed ring assemblies (4).
[0031] It also includes lead screw guide rods (2), which include multiple sets and are evenly arranged between the lead screws (6); the chain (5) is tensioned by passing around the end of the linear guide rail (7).
[0032] The lead screw (6) passes through the exhaust volute (1) and is provided with limit stops at both ends to prevent the lead screw (6) from coming out.
[0033] The lead screw guide rod (2) passes through the exhaust volute (1) and is provided with limit stops at both ends.
[0034] Example 2
[0035] A throttling method for the exhaust system of a compressor test bench includes the following steps:
[0036] The compressor test is to obtain the performance of constant speed lines, that is, to obtain the relevant performance curves of different pressure ratios under the condition that the compressor speed is constant. In the test, the compressor outlet back pressure can be continuously increased by adjusting and reducing the outlet area of the compressor guide diffuser.
[0037] (1) Before the test, check that the gap between the inner and outer toothed rings is in a state of mutual circumferential blocking, and move the inner and outer toothed rings to the outer edge of the compressor exhaust channel.
[0038] (2) First, adjust the compressor to the test operating speed, remotely control the motor and drive the inner and outer gear rings to move in the horizontal direction through the chain, gear and screw, and change the area of the compressor guide diffuser.
[0039] (3) The axial movement distance of the exhaust throttling device shall not exceed 1% of the full range each time. Adjust linearly and observe the compressor outlet pressure in real time.
[0040] (4) When the compressor outlet pressure reaches the required pressure, stop the axial movement of the inner and outer toothed rings. After the state stabilizes, measure the compressor outlet pressure, flow rate and temperature parameters.
[0041] (5) When the compressor outlet pressure gradually increases and approaches the stall point, the axial movement distance of the exhaust throttling device shall not exceed 0.25% of the full range each time to avoid the compressor entering a surge state and damaging the compressor and test equipment;
[0042] (6) Continuously move the inner and outer toothed rings of the exhaust throttling in the axial direction to make the pressure ratio reach different pressure ratio states, and finally obtain the constant speed line.
[0043] The above description is merely a preferred embodiment of the present invention, and is one implementation method based on the overall concept of the present invention. Furthermore, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A throttling device for the exhaust system of a compressor test bench, characterized in that, The exhaust system of the compressor test bench includes an exhaust pipe (5) and an exhaust volute (1); the exhaust pipe (5) has an outlet end that extends into the exhaust volute, and the outlet end of the exhaust pipe is flared, with the outlet circumferentially located at this end; the throttling device includes an inner and outer gear ring assembly (4) and a lead screw (6); the inner and outer gear ring assembly (4) is fitted at the outlet of the exhaust pipe, and one end of it has a flange, with a nut circumferentially fixed on the flange, which is connected to the lead screw (6) axially penetrating the exhaust volute (1) through the nut; the two ends of the lead screw guide rod (2) axially penetrate the exhaust volute (1), and by rotating the lead screw (6) through one end of the exhaust volute (1), the inner and outer gear ring assembly (4) is driven to move along the direction of the lead screw (6) to adjust the airflow channel area of the outlet of the exhaust pipe (5); It also includes a drive unit, which includes a sprocket (9), a chain (7), and a motor (8); the sprocket (9) is fixedly mounted on one end of the lead screw (6) that passes through the exhaust volute (1), the chain (7) is mounted on the sprocket (9), and the motor (8) is fixed on the outer end face of the exhaust volute (1). The motor (8) is connected to the chain (7) for driving the chain (7) to move, thereby driving the sprocket (9) to rotate, and further driving the inner and outer toothed ring assembly (4) to move along the direction of the lead screw (6) to adjust the airflow channel area of the exhaust pipe (5) outlet.
2. The throttling device for the exhaust system of a compressor test bench according to claim 1, characterized in that, It also includes a limit switch (3), which is disposed on the lead screw (6) and is used to limit the linear movement range of the inner and outer gear ring assembly (4).
3. The throttling device for the exhaust system of a compressor test bench according to claim 1, characterized in that, The lead screw (6) includes at least 3 sets, which are evenly arranged circumferentially along the inner and outer toothed ring assembly (4).
4. The throttling device for the exhaust system of a compressor test bench according to claim 1, characterized in that, The lead screw guide rod (2) comprises multiple sets, which are evenly arranged between the lead screws (6).
5. A throttling device for the exhaust system of a compressor test bench according to claim 1, characterized in that, The lead screw (6) passes through the exhaust volute (1) and is provided with limit stops at both ends to prevent the lead screw (6) from coming out.
6. The throttling device for the exhaust system of a compressor test bench according to claim 1, characterized in that, The lead screw guide rod (2) passes through the exhaust volute (1) and is provided with limit stops at both ends.
7. An exhaust system for a compressor test bench, characterized in that, The invention includes a throttling device for the exhaust system of a compressor test bench as described in any one of claims 1-6.
8. A method for throttling the exhaust system of a compressor test bench, employing the throttling device for the exhaust system of a compressor test bench as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Before the test, check that the gap between the inner and outer toothed ring assemblies (4) is in a state of mutual circumferential obstruction, and move the inner and outer toothed ring assemblies (4) to the outer edge of the compressor exhaust channel. Step 2: First, adjust the compressor to the test operating speed, remotely control the motor (8) and drive the inner and outer gear ring assembly (4) to move along the horizontal axis through the sprocket (9), chain (7) and lead screw (6), thereby changing the area of the compressor guide diffuser. Step 3: The axial movement distance of the inner and outer gear ring assembly (4) shall not exceed 1% of the full range each time. Adjust linearly and observe the compressor outlet pressure in real time. Step 4: When the compressor outlet pressure reaches the required pressure, stop the axial movement of the inner and outer toothed ring assembly (4). After the state stabilizes, measure the compressor outlet pressure, flow rate, and temperature parameters. Step 5: When the compressor outlet pressure gradually increases and approaches the stall point, the axial movement distance of the inner and outer gear ring assemblies (4) shall not exceed 0.25% of the full range each time; to avoid the compressor entering a surge state and damaging the compressor and test equipment; Step 6: Repeat steps 2-5 to achieve different pressure ratios and obtain constant speed curves.