Valve plate fatigue test device

Abstract

The invention discloses a valve plate fatigue test device which comprises punch assemblies and a driving assembly, the punch assemblies are distributed in a circumferential mode, valve plates are installed on the outer sides of the punch assemblies, the driving assembly is arranged on the inner sides of the punch assemblies, and the driving assembly drives the punch assemblies to intermittently stretch out and draw back to impact the valve plates to simulate closing of the valve plates. The driving assembly is further in transmission connection with an adjusting assembly so as to adjust the impact strength of the driving assembly. By arranging the driving assembly, the punch assembly is driven to impact the valve plate intermittently and repeatedly so as to drive the valve plate to repeatedly realize the opening action, and the exhaust process of the valve plate under the working condition of use is simulated, so that the test result of the valve plate is more accurate; in addition, the driving assembly can be adjusted through the adjusting assembly, so that different loading strengths of the driving assembly on the punch assembly can be changed, and the test device can meet different loading strength requirements.

Description

Technical Field

[0001] The invention relates to the technical field of valve plate testing, and in particular to a valve plate fatigue testing device. Background Art

[0002] The exhaust valve plate is a combination of pump body parts that can establish suction and exhaust pressure and is one of the key components in refrigeration compressors. With the promotion of compressor frequency conversion technology, the number of openings of the exhaust valve plate per unit time has increased significantly, and the fatigue performance requirements of the valve plate are getting higher and higher. Since the service life of refrigeration compressors is required to be more than 10 years, for this requirement, valve plate fatigue, as a key component of the pump body, requires additional specific tests to verify the reliability of the valve plate material.

[0003] From the movement law of the gas valve, we can know that when the gas valve is opened and closed, the speed of the valve plate is relatively large, so the speed of hitting the lift limiter or the valve port is also relatively large, which means that the energy is relatively large. The movement trajectory of the valve plate is decomposed. The force at each trajectory point varies within one cycle, and is mainly composed of bending and impact forces.

[0004] The existing technology uses a slider to drive a punch to open and close the valve plate. The valve plate and the punch are always in contact. The number of punches is consistent with the number of valve plates. The life test of multiple valve plates can be carried out at one time. However, this method mainly simulates the contact bending fatigue performance of the valve plate. The impact speed of the valve plate is relatively small, and is accompanied by surface wear of the valve plate material, which is inconsistent with the actual situation.

[0005] The existing fatigue test methods cannot accurately simulate the stress condition of the valve plate, and therefore cannot obtain good test results. Summary of the invention

[0006] In view of the shortcomings of the prior art, a valve plate fatigue test device is proposed, which solves the problem that the fatigue test methods in the above background technologies cannot accurately simulate the stress conditions of the valve plate and therefore cannot obtain good test results.

[0007] To achieve the above objectives, the present invention proposes the following technologies to achieve the above objectives: A valve plate fatigue testing device comprises a punch assembly and a drive assembly, wherein the punch assemblies are distributed in a circle, a valve plate is mounted on the outer side of the punch assembly, and the drive assembly is arranged on the inner side of the punch assembly. The drive assembly drives the punch assembly to intermittently extend and retract to impact the valve plate to simulate the closure of the valve plate, and the drive assembly is also transmission-connected to an adjustment assembly to adjust the impact strength of the drive assembly.

[0008] Furthermore, the punch assembly includes an annular bracket, and a punch is slidably connected to the annular bracket. The punch moves along the radial direction of the annular bracket to extend and drive the valve plate to open.

[0009] Furthermore, the driving assembly includes wedge blocks, which are distributed in a circular array. The wedge blocks rotate around the center of the annular bracket to abut and push the punch out of the annular bracket in turn.

[0010] Furthermore, the driving assembly also includes a driving ring, and the wedge block is installed on the outside of the driving ring through a telescopic rod. The length of the telescopic rod extending out of the driving ring is adjustable so that different positions of the wedge block can push the punch.

[0011] Furthermore, a guide rail is provided on the inner side of the driving ring, the driving ring is fixedly connected to the driving shaft via the guide rail, and the telescopic rod is slidably connected in the guide rail.

[0012] Furthermore, the adjustment component is sleeved on the periphery of the drive shaft, and the adjustment component reciprocates along the extension direction of the drive shaft to push the telescopic rod to extend and retract in the guide rail, thereby changing the contact position between the wedge block and the punch to adjust the impact strength.

[0013] Furthermore, the adjustment assembly includes a sleeve, a first top block is provided at the bottom of the sleeve along the circumferential direction, a second top block is abutted below the first top block, and the second top block is fixed to the end of the telescopic rod.

[0014] Furthermore, the adjustment assembly also includes an adjustment sleeve, which is arranged on the outside of the driving shaft and is threadedly connected to the driving shaft. The adjustment sleeve is located above the sleeve and the two are rotatably connected.

[0015] Furthermore, an annular slider is provided at the bottom of the adjusting sleeve, and an annular guide sleeve is slidably connected to the outside of the annular slider, and the annular guide sleeve is fixed above the sleeve.

[0016] Furthermore, the outer periphery of the punch is provided with a first spring for pushing the punch to reset, a second spring is provided between the drive ring and the second top block, and the second spring is sleeved on the outer periphery of the telescopic rod to limit the wedge block.

[0017] Compared with the prior art, the comprehensive effects brought by the present invention include: By setting up a driving assembly, the punch assembly is driven to intermittently and repeatedly impact the valve plate to drive the valve plate to repeatedly open, simulating the exhaust process of the valve plate under the working conditions of the valve plate, so as to make the valve plate test results more accurate; in addition, the driving assembly can be adjusted through the adjustment assembly, so as to change the different loading strengths of the driving assembly on the punch assembly, so that the test device can meet different loading strength requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic top view of the overall structure of an embodiment of the present invention; Figure 2This is a schematic cross-sectional view of the driving assembly according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the regulating component according to an embodiment of the present invention.

[0019] Legend: 1. Valve plate; 2. Annular bracket; 3. Punch; 4. Wedge block; 5. Drive ring; 6. Telescopic rod; 7. Wedge block; 8. Guide rail; 9. Drive shaft; 10. Sleeve; 11. First top block; 12. Second top block; 13. Adjustment sleeve; 14. Annular guide sleeve; 15. First spring; 16. Second spring. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present invention.

[0021] In this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "top", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0022] like Figures 1 to 3 As shown, a valve plate fatigue testing device includes a punch assembly and a drive assembly, wherein the punch assemblies are distributed in a circle, a valve plate 1 is installed on the outer side of the punch assembly, and the drive assembly is arranged on the inner side of the punch assembly. The drive assembly drives the punch assembly to intermittently extend and retract to impact the valve plate 1 to simulate the closing of the valve plate 1, and the drive assembly is also connected to an adjustment assembly to adjust the impact strength of the drive assembly.

[0023] Specifically, the present invention fixes one end of the valve plate 1 and cyclically performs the following actions: an action of the punch assembly impacting the valve plate, in which the punch assembly impacts the free end of the valve plate 1, so that the valve plate 1 bends, simulating the shape of the valve plate 1 when exhausting; a reset action, in which the punch assembly stops impacting the free end of the valve plate 1, and the free end of the valve plate 1 is reset, simulating the reset shape of the valve plate 1 when exhausting.

[0024] The valve plate 1 cyclically performs the above-mentioned exhaust and reset actions to accurately simulate the stress condition of the valve plate 1, thereby truly evaluating the reliability of the exhaust structure and materials and obtaining accurate test results.

[0025] The present embodiment also includes a valve plate mounting frame, which is fixedly mounted on the machine base, and the valve plate 1 is fixed on the outer side of the valve plate mounting frame, and its free end is fitted on the impact hole opened on the valve plate mounting frame. Preferably, a valve plate stopper is also fixedly arranged on the outer side of the valve plate 1, and the valve plate 1 and the valve plate stopper are fixed to the valve plate mounting frame by fasteners. Further preferably, a receiving groove is arranged at a position corresponding to the valve plate 1 on the valve plate mounting frame, and the valve plate 1 and the valve plate stopper are both accommodated in the receiving groove. The shape of the receiving groove is preferably the same as the appearance of the valve plate 1 and the valve plate stopper.

[0026] By setting up a driving component, the punch component is driven to intermittently and repeatedly impact the valve plate 1 to drive the valve plate 1 to repeatedly open, simulating the exhaust process of the valve plate 1 under the working conditions, so as to make the test result of the valve plate 1 more accurate; in addition, the driving component can be adjusted through the adjusting component, so as to change the different loading strengths of the driving component on the punch component, so that the test device can meet different loading strength requirements.

[0027] Specifically, the valve plate fatigue testing device in this embodiment can be used to test valve plates 1 of various specifications, and adjustments can be made according to different loading strengths under different usage conditions of the same valve plate 1, or according to different loading strength requirements of different valve plates 1, or different specifications of valve plates 1 can be installed on the valve plate mounting seat at the same time to perform tests with the same loading strength, so that the test environment is closer to the actual situation and the test range is wider, while reducing the use of multiple test equipment and reducing the test cost.

[0028] In the valve plate fatigue test device of this embodiment, the punch assembly includes an annular bracket 2, and a punch 3 is slidably connected to the annular bracket 2. The punch 3 moves along the radial direction of the annular bracket 2 to extend and drive the valve plate 1 to open.

[0029] Specifically, an annular bracket 2 is provided and a punch 3 for impacting the valve disc 1 is provided along the circumferential direction, so that impact loading tests can be performed on multiple valve discs 1 at the same time. Corresponding to the annular bracket 2, the valve disc mounting frame also has an annular structure, and the number of punches 3 corresponds to the number of valve discs 1 installed on the valve disc mounting frame, and the positions of the punches 3 correspond one-to-one to the valve discs 1 and the impact holes. The punches 3 on each stamping mechanism respectively test the tongue reed parts of the valve disc 1 that need to be tested.

[0030] Preferably, a guide seat 7 is provided on the periphery of the annular bracket 2, and the punch 3 passes through the guide seat 7 and the annular bracket 2 respectively and extends to the interior of the annular bracket 2. The guide seat 7 is provided to guide the punch 3 to ensure that the punch 3 can be radially extended and retracted along the annular bracket 2, thereby aligning the impact hole to impact the valve plate 1 to realize the loading completion test simulation.

[0031] Specifically, the outer sleeve of the punch 3 is provided with a first spring 15 for pushing the punch 3 to reset. The punch 3 is located on the outside of the annular bracket, that is, a limit block is provided on the outer side of the side in contact with the valve plate 1. The first spring 15 is located between the limit block and the guide seat 7. The first spring 15 is a compression spring. In the initial state, the first spring 15 contracts and drives the punch 3 to be inserted into the annular bracket 2. When the punch 2 is extended by the driving assembly, the first spring 15 extends. Then, when the driving assembly no longer pushes the punch 3, the first spring 15 shortens and drives the punch 3 to recover.

[0032] In the valve plate fatigue test device of this embodiment, the driving assembly includes wedge blocks 4, which are distributed in a circular array. The wedge blocks 4 rotate around the center of the annular bracket 2 to abut and push the punch 3 out of the annular bracket 2 in turn.

[0033] By setting the above structure, during use, since multiple wedge blocks 4 are arranged in the circumferential direction, when the multiple wedge blocks 4 rotate, when the wedge blocks 4 pass through the punch 3, the inclined surface contacts the punch 3 and forces the punch 3 to move. Each time the wedge block 4 rotates one circle, each punch 3 is pushed, and each punch 3 impacts the valve plate 1 multiple times. Assuming that there are 6 wedge blocks 4, the punch 3 is driven 6 times each time the wedge block 4 rotates one circle. In the same time, the valve plate 1 is tested more times, which greatly improves the working efficiency.

[0034] Specifically, the surface of one side of the wedge block 4 close to the punch 3 is inclined. When the wedge block 4 performs a circular motion, its inclined surface contacts the end of the punch 3 and as the wedge block 4 continues to move, the inclined surface gradually pushes the punch 3 outward to impact the valve plate 1.

[0035] Preferably, as the wedge block 4 rotates, the position where the punch 3 begins to contact the inclined surface determines the maximum length that the punch 3 can extend. For example, if the punch 3 begins to contact the lowest point of the inclined surface of the wedge block 4, the length that the punch 3 can extend is the radial distance between the highest point and the lowest point of the inclined surface; if the punch 3 contacts the middle of the inclined surface of the wedge block 4, the length that the punch 3 can extend is half of the distance between the highest point and the lowest point.

[0036] It is understandable that when the punch 3 extends out longer, the impact force it brings to the valve plate 1 is greater, that is, the loading intensity is greater. Therefore, the loading intensity of the punch 3 can be adjusted by changing the contact position between the punch 3 and the wedge block 4 to adapt to different loading requirements, so that the test results are more accurate and the application range is wider.

[0037] Specifically, the surface of the wedge block 4 may also be other shapes with arc or radial height difference, and its specific structural form will not be described in detail here.

[0038] In the valve plate fatigue test device of this embodiment, the driving assembly also includes a driving ring 5, and the wedge block 4 is installed on the outside of the driving ring 5 through a telescopic rod 6. The length of the telescopic rod 6 extending out of the driving ring 5 is adjustable so that the wedge block 4 can push the punch 3 at different positions.

[0039] Specifically, a driving ring 5 is provided to provide support for the wedge block 4 and drive the wedge block 4 to rotate in a circle, and a telescopic rod 6 is provided to provide the wedge block 4 with a sufficient extension length. When the telescopic rod 6 extends out of the driving ring 5, the wedge block 4 at its end is driven to approach the punch 3, thereby changing the contact position between the punch 3 and the wedge block 4 to adjust the loading strength of the punch 3 to adapt to different loading requirements.

[0040] In the valve plate fatigue test device of this embodiment, a guide rail 8 is provided on the inner side of the driving ring 5 , the driving ring 5 is fixedly connected to the driving shaft 9 via the guide rail 8 , and the telescopic rod 6 is slidably connected in the guide rail 8 .

[0041] Specifically, a guide rail 8 is provided to realize the connection between the drive ring 5 and the drive shaft 9, so that the drive ring 5 can rotate driven by the drive shaft 9. The drive shaft 9 is connected to the end of the drive device. The drive device is preferably a motor. The motor shaft of the motor is connected to the drive shaft 9 through a coupling. The drive shaft 9 is connected to the drive ring 5.

[0042] Preferably, a guide rail 8 structure is provided to realize the connection between the drive ring 5 and the drive shaft 9, and a telescopic groove is provided for the telescopic rod 6 to be received and slide. The telescopic rod 6 slides in the guide rail 8 to realize telescopic extension and further drives the extension length adjustment of the wedge block 4, thereby changing the contact position between the punch 3 and the wedge block 4 to adjust the loading strength of the punch 3 to adapt to different loading requirements.

[0043] In the valve plate fatigue test device of this embodiment, the adjusting component is sleeved on the periphery of the driving shaft 9, and the adjusting component reciprocates along the extension direction of the driving shaft 9 to push the telescopic rod 6 to extend and retract in the guide rail 8, thereby changing the contact position between the wedge block 4 and the punch 3 to adjust the impact strength.

[0044] Specifically, the adjustment assembly includes a sleeve 10 , a first top block 11 is provided at the bottom of the sleeve 10 along the circumferential direction, a second top block 12 is abutted below the first top block 11 , and the second top block 12 is fixed to the end of the telescopic rod 6 .

[0045] Specifically, the lower surface of the first top block 11 is set as an inclined surface, and the upper surface of the second top block 12 is set as a corresponding inclined surface. The inclined surfaces of the first top block 11 and the second top block 12 fit together, and the second top block 12 is slidably connected in the guide rail 8. Through the above structure, the position of the sleeve 10 is adjusted in the vertical direction. Through the cooperation of the two abutting inclined surfaces, the vertical movement of the first top block 11 is changed into the horizontal movement of the second top block 12, so that the second top block 12 slides in the guide rail 8 to drive the telescopic rod 6 and the wedge block 4 to extend and retract.

[0046] Specifically, a second spring 16 is provided between the driving ring 5 and the second top block 12, and the second spring 16 is sleeved on the periphery of the telescopic rod 6 to limit the wedge block 4. The second spring 16 is a tension spring, which is in an extended state in the initial state, and generates a driving force through the extension to push the second top block 12 and the first top block 11 to be in dynamic balance, thereby fixing the positions of the telescopic rod 6 and the wedge block 4, and preventing the extended length of the wedge block 4 from changing arbitrarily.

[0047] In the valve plate fatigue test device of this embodiment, the adjustment assembly also includes an adjustment sleeve 13, which is sleeved on the outside of the drive shaft 9 and threadedly connected to the drive shaft 9. The adjustment sleeve 13 is located above the sleeve 10 and the two are rotatably connected.

[0048] Through the above arrangement, the rotating adjustment sleeve 13 realizes the up and down movement on the driving shaft 9 through threaded cooperation, thereby driving the sleeve 10 to move in the vertical direction so that the first top block 11 and the second top block 12 move relative to each other, thereby adjusting the extension length of the telescopic rod 6 and the wedge block 4, changing the contact position of the punch 3 and the inclined surface of the wedge block 4, and adjusting the loading strength of the punch 3 to adapt to different loading requirements.

[0049] In the valve plate fatigue test device of this embodiment, an annular slider is provided at the bottom of the adjustment sleeve 13 , and an annular guide sleeve 14 is slidably connected to the outside of the annular slider. The annular guide sleeve 14 is fixed above the sleeve 10 .

[0050] The annular slider and the annular guide sleeve 14 are provided to realize the rotational connection between the adjusting sleeve 13 and the sleeve 10 , thereby realizing the linkage between the adjusting sleeve 13 and the sleeve 10 .

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "rotation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0053] Although the embodiments of the present invention have been shown and described in detail, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve plate fatigue test device, characterized in that: It includes a punch assembly and a drive assembly, wherein the punch assembly is distributed in a circle, a valve plate is installed on the outer side of the punch assembly, and the drive assembly is arranged on the inner side of the punch assembly. The drive assembly drives the punch assembly to intermittently extend and retract to impact the valve plate to simulate the closure of the valve plate, and the drive assembly is also transmission-connected with an adjustment assembly to adjust the impact strength of the drive assembly.

2. The valve plate fatigue testing device according to claim 1, characterized in that: The punch assembly comprises an annular bracket, on which a punch is slidably connected, and the punch moves along the radial direction of the annular bracket to extend and drive the valve plate to open.

3. The valve plate fatigue testing device according to claim 2, characterized in that: The driving assembly comprises wedge blocks, which are distributed in a circumferential array. The wedge blocks rotate around the center of the annular bracket to abut against and push the punch out of the annular bracket in turn.

4. The valve plate fatigue testing device according to claim 3, characterized in that: The driving assembly also includes a driving ring, and the wedge block is installed on the outside of the driving ring through a telescopic rod. The length of the telescopic rod extending out of the driving ring is adjustable so that different positions of the wedge block can push the punch.

5. The valve plate fatigue testing device according to claim 4, characterized in that: A guide rail is arranged on the inner side of the driving ring, the driving ring is fixedly connected to the driving shaft through the guide rail, and the telescopic rod is slidably connected in the guide rail.

6. The valve plate fatigue testing device according to claim 5, characterized in that: The adjusting component is sleeved on the periphery of the driving shaft, and the adjusting component reciprocates along the extending direction of the driving shaft to push the telescopic rod to extend and retract in the guide rail, thereby changing the contact position between the wedge block and the punch to adjust the impact strength.

7. The valve plate fatigue testing device according to claim 6, characterized in that: The adjustment assembly comprises a sleeve, a first top block is arranged at the bottom of the sleeve along the circumferential direction, a second top block is abutted below the first top block, and the second top block is fixed to the end of the telescopic rod.

8. The valve plate fatigue testing device according to claim 7, characterized in that: The adjustment assembly also includes an adjustment sleeve, which is arranged on the outside of the driving shaft and is threadedly connected to the driving shaft. The adjustment sleeve is located above the sleeve and the two are rotatably connected.

9. The valve plate fatigue testing device according to claim 8, characterized in that: An annular sliding block is arranged at the bottom of the adjusting sleeve, and an annular guide sleeve is slidably connected to the outside of the annular sliding block, and the annular guide sleeve is fixed on the top of the sleeve.

10. The valve plate fatigue testing device according to claim 7, characterized in that: The outer periphery of the punch is sleeved with a first spring for pushing the punch to reset, a second spring is arranged between the drive ring and the second top block, and the second spring is sleeved on the outer periphery of the telescopic rod to limit the wedge block.

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