A system and method for detecting cross ring stress in a scroll compressor

Abstract

This invention provides a wireless dynamic strain measurement device for a scroll compressor cross-ring, relating to the field of compressor condition monitoring technology. It includes a high-temperature strain gauge, a wire fixing system, and a wireless sensor. The high-temperature strain gauge is attached to the stress-sensitive areas of the stationary key, ring beam, and moving key of the cross-ring, respectively. The wire fixing system comprises a three-stage fixing structure formed by adhesive, an internal wire, an external wire, and an internal terminal block. The three-stage fixing structure consists of a strain gauge end fixing structure, a lead wire transition section fixing structure, and a terminal block end fixing structure. The high-temperature strain gauge is connected to the wireless sensor via the internal wire, terminal block, and external wire to achieve continuous signal acquisition. By implementing the technical approach of this invention, high-quality data acquisition of the impact load experienced by the cross-ring during compressor start-up and shutdown can be achieved, enabling data acquisition within the sealed cavity and providing an experimental basis for subsequent strength design of the cross-ring.

Description

Technical Field

[0001] This invention relates to the field of compressor condition monitoring technology, and more specifically, to a dynamic measurement device and method for cross-ring strain of a scroll compressor, which is particularly suitable for high-precision online monitoring of dynamic strain of the cross-ring under high pressure and high temperature conditions. Background Technology

[0002] In the existing industrial inspection field, for the inspection of cross rings, patent number CN220931912U designs a new type of inspection device to replace the coordinate measuring machine for precision inspection of cross rings; patent number CN217083586U designs a rapid detection device for the friction surface height of cross rings using instruments such as positioning blocks, reference blocks, and dial indicators; patent number CN216518617U sets a magnet at the end of the cross ring and a magnetizing element at the corresponding keyway to detect the change in magnetic field, and then uses a controller to receive the sensing signal to realize the fault detection of the cross ring; patent number CN212058611U designs a cross ring convex key verticality detection device, including a base plate, a linear guide rail assembly, and a measuring assembly, to realize the detection of the cross ring convex key.

[0003] However, no reasonable method for detecting the stress of cross rings is mentioned in the existing technology. Therefore, it is particularly important to design a system that can accurately detect the strain of cross rings under high pressure and high temperature conditions and provide some guidance for the initial mechanical properties of cross ring products. Summary of the Invention

[0004] To address the aforementioned technical problems in existing strain measurement systems, such as insufficient vibration resistance, inadequate temperature drift compensation, and severe signal distortion under large strain ranges, this invention provides a dynamic strain measurement device and method for a scroll compressor cross-ring. This invention utilizes high-temperature resistant strain gauges mounted on the dynamic and static keys of the cross-ring and the curved surface of the ring beam. A three-stage fixing structure optimizes the wiring path along the cross-ring's movement trajectory. After real-time conditioning via a quarter-bridge module, the signal is output to an external monitoring terminal via an anti-interference transmission link, achieving continuous signal acquisition.

[0005] The technical means employed in this invention are as follows: A wireless dynamic strain measurement device for a scroll compressor cross ring includes: a high-temperature resistant strain gauge, a wire fixing system, and a wireless sensor; The high-temperature resistant strain gauges are respectively attached to the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring. The wire fixing system includes a three-level fixing structure formed by adhesive, an internal wire, an external wire, and a terminal block. The three-level fixing structure consists of a strain gauge end fixing structure, a lead wire transition section fixing structure, and a terminal block end fixing structure. The high-temperature resistant strain gauges are connected to the wireless sensor through the internal wire, terminal block, and external wire to achieve continuous signal acquisition.

[0006] Furthermore, the high-temperature strain gauge has a resistance of 120Ω and an operating temperature range of -50℃ to 150℃.

[0007] Furthermore, the strain gauge end fixing structure is bonded to the strain gauge end fixing area, which is the area where the internal wires are connected to the high-temperature resistant strain gauge, and the bonding length of the strain gauge end fixing structure is 3±0.5mm, completely covering the root of the high-temperature resistant strain gauge lead. The lead wire transition section fixing structure is used to bond the internal wires to the ring beam. The thickness of the adhesive layer is 0.2-0.5mm and the bonding length is 10-15mm, which is used to disperse vibration stress. The terminal end fixing structure is bonded to the terminal end fixing area, which is the area where the internal wires are soldered to the terminal end fixing structure. The bonding area is ≥25mm². The terminal end fixing structure and the terminal are interlocked. The terminal connects to the external wires to realize data acquisition and transmission.

[0008] Furthermore, the high-temperature resistant strain gauge is attached to the radial force-bearing surface of the stationary key, specifically at the center point of the outer surface of the upper protrusion of the stationary key and the coplanar point of the ring beam on the same side.

[0009] Furthermore, the high-temperature resistant strain gauge is attached to the radial contact surface of the moving key, specifically at the center point of the outer side of the moving key and the coplanar ring beam on the same side.

[0010] This invention also provides a method for wireless measurement of dynamic strain of a scroll compressor cross ring, comprising the following steps: High-temperature resistant strain gauges are bonded to the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring. The internal wires are laid in pre-set grooves along the outer side of the ring beam, and fixed with adhesive dots every 15mm. High-temperature strain gauges are bonded in stages using adhesives to form a three-level fixation structure: Strain signals are acquired at a fixed sampling frequency using a quarter-bridge circuit and transmitted to an external monitoring terminal via a wireless sensor.

[0011] Furthermore, the strain signal is acquired at a fixed sampling frequency using a quarter-bridge circuit module, which includes: using a quarter-bridge circuit topology and voltage excitation method to acquire the signal at a sampling frequency of 1000Hz, so as to reduce the influence of high-frequency signal modulation and ensure the accuracy of instantaneous sampling during the compressor start-up and shutdown phases.

[0012] Furthermore, the bonding of high-temperature strain gauges in the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring includes: smoothing the rust layer on the surface of the cross ring with a file, uniformly applying adhesive to form a 0.1mm adhesive layer, and applying pressure of 0.3MPa for 120 seconds to complete the initial bonding.

[0013] Compared with the prior art, the present invention has the following advantages: This invention employs an adhesive to construct a three-tiered fixing structure: a strain gauge end fixing area with a length of 3±0.5mm, completely covering the root of the lead wire to prevent breakage caused by stress concentration; a lead wire transition section fixing area with an adhesive layer of 0.2-0.5mm and a length of 10-15mm, using a thickness gradient design to disperse vibration energy; and a terminal end fixing area with an adhesive area ≥25mm², providing dual fixation through mechanical anchoring and chemical bonding.

[0014] Meanwhile, this invention is equipped with a two-wire quarter-bridge circuit, with key parameters including: 500Ω high-precision surface mount resistors; ±15000 micro-strain range coverage, reducing nonlinear errors at a 2m line length; and a 1000Hz sampling rate and 250KBPS transmission rate designed together to fully capture the compressor start-up and shutdown transient process.

[0015] By implementing the technical approach of this invention, the impact load on the cross ring during compressor start-up and shutdown can be collected with high quality, enabling data acquisition inside the sealed cavity and providing an experimental basis for the subsequent strength design of the cross ring. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the various structures and patch locations of the cross ring of the present invention.

[0019] Figure 3 This is a schematic diagram of the ring beam lead wire fixing method in this invention.

[0020] In the diagram: 1. Scroll compressor; 2. Terminal block; 3. External wire; 4. Wireless sensor; 5. Static key; 6. Ring beam; 7. Moving key; 8. High-temperature strain gauge; 9. Internal wire; 10. Junction box; 11. Cross ring. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0025] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0026] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0028] like Figure 1-3 As shown, the present invention provides a wireless dynamic strain measurement device for a scroll compressor cross ring, comprising: a high-temperature resistant strain gauge 8, a wire fixing system, and a wireless sensor 4; Among them, the high-temperature resistant strain gauge 8 is attached to the stress-sensitive areas of the static key 5, ring beam 6 and moving key 7 of the cross ring 11 each time; the wire fixing system includes a three-level fixing structure formed by adhesive, an internal wire 9, an external wire 3 and a terminal block 2; the three-level fixing structure is, in sequence, the strain gauge end fixing structure, the lead wire transition section fixing structure and the terminal block 2 end fixing structure; the high-temperature resistant strain gauge 8 is connected to the wireless sensor 4 through the internal wire 9, the terminal block 2 and the external wire 3 to realize continuous signal acquisition.

[0029] Preferably, the high-temperature strain gauge 8 has a resistance of 120Ω and an operating temperature range of -50℃ to 150℃.

[0030] Preferably, the strain gauge end fixing structure is bonded to the strain gauge end fixing area, which is the connection area between the internal wire 9 and the high-temperature resistant strain gauge 8, and the bonding length of the strain gauge end fixing structure is 3±0.5mm, completely covering the root of the lead wire of the high-temperature resistant strain gauge 8. The lead wire transition section fixing structure is used to bond the internal conductor 9 to the ring beam 6. The thickness of the adhesive layer is 0.2-0.5mm and the bonding length is 10-15mm, which is used to disperse vibration stress. The fixing structure at the end of terminal 2 is bonded to the fixing area at the end of terminal 2. The fixing area at the end of terminal 2 is the area where the internal wire 9 is soldered to the fixing structure at the end of terminal 2. Its bonding area is ≥25mm². The fixing structure at the end of terminal 2 and terminal 2 are interlocked. Terminal 2 is connected to the external wire 3 to realize data acquisition and transmission.

[0031] Preferably, the high-temperature strain gauge 8 is attached to the radial force-bearing surface of the stationary key 5, specifically, it is attached to the center point of the coplanarity between the outer surface of the upper protrusion of the stationary key 5 and the ring beam 6 on the same side. The high-temperature strain gauge 8 is attached to the radial contact surface of the moving key 7, specifically, it is attached to the center point of the coplanarity between the outer surface of the moving key 7 and the ring beam 6 on the same side.

[0032] This invention also provides a method for wireless measurement of dynamic strain of a scroll compressor cross ring, comprising the following steps: High-temperature strain gauges 8 are bonded to the stress-sensitive areas of the stationary key 5, ring beam 6, and moving key 7 of the cross ring 11. After smoothing the rust layer on the surface of the cross ring 11 with a file, an adhesive layer of 0.1 mm is evenly applied and maintained at 0.3 MPa for 120 seconds to complete the initial bonding. An auxiliary adhesive layer is added to the root area of ​​the stationary key 5 to cover the root of the lead wire and form a stress buffer structure.

[0033] The internal wires 9 are routed through a pre-set groove along the outer side of the ring beam 6, and are fixed with adhesive dots every 15mm. High-temperature strain gauge 8 was bonded together in stages using adhesive to form a three-level fixing structure: The junction box 10 is located outside the terminal block 2. The interior of the junction box 10 is layered and shielded. The external wire 3 is directly connected to the wireless sensor 4.

[0034] Strain signals are acquired at a fixed sampling frequency using a quarter-bridge circuit module and transmitted to an external monitoring terminal via wireless sensor 4. Specifically, a quarter-bridge circuit topology and voltage excitation method are used to acquire signals at a sampling frequency of 1000Hz to reduce the influence of high-frequency signal modulation and ensure the accuracy of instantaneous sampling during the compressor's start-up and shutdown phases.

[0035] The quarter-bridge circuit module includes: a high-precision 500Ω bridge resistor with a two-wire connection; an amplification and conditioning circuit covering ±15000 micro-strain; and output using a voltage excitation source. like Figure 2 As shown, x, y, and z coordinate axes are established with the center point of the cross ring 11. The radial force measurement direction of the high-temperature strain gauge 8 attached to the stationary key 5 and the moving key 7 is located with the coordinate axes. The measurement direction at the stationary key 5 is: σ1 is the direction parallel to the z-axis of the coordinate axis, and σ3 is the 45° angle direction between the +x and +y coordinate planes. Measurement directions at key 7: σ1´ is the 45° angle direction between the +x and +z coordinate planes; σ3´ is the 45° angle direction between the +z and -x coordinate planes.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless device for measuring the dynamic strain of a scroll compressor cross-ring, characterized in that, include: High-temperature strain gauges, wire fixing systems, and wireless sensors; The high-temperature resistant strain gauges are respectively attached to the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring. The wire fixing system includes a three-level fixing structure formed by adhesive, an internal wire, an external wire, and an internal terminal block. The three-level fixing structure consists of a strain gauge end fixing structure, a lead wire transition section fixing structure, and a terminal block end fixing structure. The high-temperature resistant strain gauges are connected to a wireless sensor via the internal wire, terminal block, and external wire to achieve continuous signal acquisition. The strain gauge end fixing structure is bonded to the strain gauge end fixing area, which is the area where the internal wires are connected to the high-temperature resistant strain gauge. The bonding length of the strain gauge end fixing structure is 3±0.5mm, completely covering the root of the high-temperature resistant strain gauge lead. The lead wire transition section fixing structure is used to bond the internal wires to the ring beam. The thickness of the adhesive layer is 0.2-0.5mm and the bonding length is 10-15mm. It is used to enhance anti-interference and prevent the wires from being torn apart. The terminal end fixing structure is bonded to the terminal end fixing area, which is the area where the internal wires are soldered to the terminal end fixing structure. The bonding area is ≥25mm². The terminal end fixing structure and the terminal are interlocked. The terminal connects to the external wires to realize data acquisition and transmission.

2. The scroll compressor cross-ring dynamic strain wireless measurement device according to claim 1, characterized in that, The high-temperature strain gauge has a resistance of 120Ω and an operating temperature range of -50℃ to 150℃.

3. The scroll compressor cross-ring dynamic strain wireless measurement device according to claim 1, characterized in that, The high-temperature strain gauge is attached to the radial force-bearing surface of the static key, specifically at the center point of the coplanar surface of the outer side of the upper protrusion of the static key and the ring beam on the same side.

4. The scroll compressor cross-ring dynamic strain wireless measurement device according to claim 1, characterized in that, The high-temperature resistant strain gauge is attached to the radial contact surface of the moving key, specifically at the center point of the coplanarity between the outer surface of the moving key and the ring beam on the same side.

5. A wireless method for measuring the dynamic strain of a scroll compressor cross ring, implemented based on the wireless measuring device for measuring the dynamic strain of a scroll compressor cross ring as described in any one of claims 1-4, characterized in that, Includes the following steps: High-temperature resistant strain gauges are bonded to the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring. The internal wires are laid in pre-set grooves along the outer side of the ring beam, and fixed with adhesive dots every 15mm. High-temperature strain gauges are bonded in stages using adhesives to form a three-level fixation structure: Strain signals are acquired at a fixed sampling frequency using a quarter-bridge circuit and transmitted to an external monitoring terminal via a wireless sensor.

6. The method for wireless measurement of dynamic strain of a scroll compressor cross ring according to claim 5, characterized in that, The strain signal is acquired at a fixed sampling frequency using a quarter-bridge circuit module. This includes using a quarter-bridge circuit topology and a voltage excitation method to acquire the signal at a sampling frequency of 1000Hz, in order to reduce the influence of high-frequency signal modulation and ensure the accuracy of instantaneous sampling during the compressor start-up and shutdown phases.

7. The method for wireless measurement of dynamic strain of a scroll compressor cross ring according to claim 5, characterized in that, The bonding of high-temperature strain gauges in the stress-sensitive areas of the static key, ring beam, and moving key of the cross ring includes: smoothing the rust layer on the surface of the cross ring with a file, uniformly applying adhesive to form a 0.1mm adhesive layer, and applying pressure of 0.3MPa for 120 seconds to complete the initial bonding.

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