Silencing structure and refrigeration equipment

Abstract

This invention discloses a noise reduction structure and refrigeration equipment, relating to the field of noise reduction technology. The noise reduction structure includes a shell, a central tube, a movable component, and an expansion chamber. The central tube has a connecting port and a pressure hole on its side wall. The movable component and the central tube enclose a pressure supply chamber, with the pressure hole connecting the internal channel of the central tube to the pressure supply chamber, while the connecting port and the pressure supply chamber are not interconnected. The movable component switches between a first position and a second position in response to changes in air pressure within the pressure supply chamber, thereby altering the flow state of the noise reduction structure. This invention, through adaptive adjustment of the internal flow state by the movable component, can dynamically match the exhaust back pressure and airflow velocity according to the operating load, effectively preventing oil accumulation in the expansion chamber under low-load conditions, maintaining stable noise reduction performance, and improving the reliability of the equipment under all operating conditions.

Description

Technical Field

[0001] This invention relates to the field of noise reduction technology, specifically to a noise reduction structure and a refrigeration device having the noise reduction structure, which is particularly suitable for suppressing airflow noise in compressor exhaust systems. Background Technology

[0002] In refrigeration equipment such as water-cooled screw compressor commercial central air conditioning units, silencers are typically installed at the compressor's exhaust port and connected to the exhaust pipe to reduce airflow noise generated during compressor exhaust. Existing silencers mostly employ a fixed, integrated cavity structure, and their noise reduction structure is a standardized, fixed design, lacking load-adaptive adjustment capabilities.

[0003] Refrigeration equipment alternates between high and low loads during operation, and the fixed-structure silencer cannot adjust its internal flow in real time, resulting in poor adaptability to operating conditions. Furthermore, in compressors such as screw compressors, lubricating oil needs to be injected during operation for sealing, lubrication, and cooling. Therefore, after the compression process, the discharge from the exhaust pipe is not pure refrigerant, but a mixture of gaseous refrigerant and atomized lubricating oil (i.e., "oil-gas"), which is an inherent operating characteristic of screw compressors.

[0004] Especially during low-load, stable operation, the airflow velocity inside the exhaust pipe is low, reducing the fluidity of the refrigerant-oil mixture. This makes it easier for oil and gas to separate and stagnate, accumulating in the expansion chamber of the muffler and forming refrigerant oil deposits. This results in the occupation of effective silencing volume, damages the original exhaust silencing channel, directly weakens the noise reduction effect, and disrupts the refrigerant-oil balance within the system, causing oil shortage problems and interfering with the unit's normal exhaust pressure stabilization. Summary of the Invention

[0005] This invention addresses the technical shortcomings of existing silencers, such as rigid structures, poor adaptability to operating conditions, easy oil accumulation, and noise reduction attenuation. It provides a silencer structure and a refrigeration device with the silencer structure, enabling the silencer structure to adaptively adjust its internal flow state in real time according to changes in the unit's operating load, thereby improving adaptability to operating conditions; it also improves airflow stagnation under low load conditions, reduces oil accumulation in the expansion chamber, maintains effective silencer volume, and continuously ensures good noise reduction performance.

[0006] The technical solution adopted in this invention is to design a noise reduction structure for use in a compressor exhaust system, including a housing, a central pipe, moving parts, and an expansion chamber.

[0007] The central tube is housed within the casing and has an internal channel for airflow. The sidewall of the central tube has a connecting port and a pressure port, which are functionally independent—the connecting port is used to introduce airflow into the expansion chamber under specific operating conditions to achieve noise reduction, and the pressure port is used to introduce high-pressure gas from within the central tube into the pressure supply chamber to drive the movable component. The movable component is movably mounted on the outside of the central tube and can switch between a first position and a second position relative to the central tube. The expansion chamber is formed within the casing.

[0008] The moving parts and the central tube enclose each other to form a pressure supply chamber. A pressure orifice connects the internal channel of the central tube to the pressure supply chamber, allowing high-pressure gas from the central tube to enter and establish pressure within it. The connecting port and the pressure supply chamber are not interconnected; that is, the connecting port is not the pressure source for the pressure supply chamber, and the two are independent in their fluid paths.

[0009] The movable component is configured such that, when in the first position, the airflow path between the connecting port and the expansion chamber is blocked; and when in the second position, the connecting port and the expansion chamber are in fluid communication. The movable component switches between the first and second positions in response to changes in air pressure within the pressure supply chamber, thereby altering the flow state of the silencing structure.

[0010] Furthermore, the movable component is a sliding sleeve fitted onto the outside of the central tube, which is axially slidable relative to the central tube. The outer wall of the central tube has a first limiting portion, and the inner wall of the sliding sleeve has a second limiting portion. The first and second limiting portions enclose a pressure supply cavity. When the sliding sleeve is in the first position, its side wall blocks the communication port; when the sliding sleeve is in the second position, the communication port communicates with the expansion chamber.

[0011] Furthermore, a pressure hole is located in the area of ​​the corresponding pressure supply chamber on the side wall of the central tube. The airflow in the central tube enters the pressure supply chamber through the pressure hole to establish the air pressure that drives the sliding sleeve to move within the pressure supply chamber.

[0012] Furthermore, one end of the sliding sleeve is closed, and the closed end of the sliding sleeve and the housing enclose an adjustment cavity. A reset element is provided in the adjustment cavity, and the reset element applies a biasing force toward the first position to the sliding sleeve. The silencing structure also includes an adjustment circuit, which is connected to the adjustment cavity and is used to introduce a pressure medium into the adjustment cavity to adjust the pressure inside the adjustment cavity.

[0013] Furthermore, the regulating circuit includes a pressure tapping line leading from the upstream end of the central pipe, a regulating valve installed on the pressure tapping line, and a venting channel connecting to the regulating chamber. The regulating valve is used to regulate the flow rate of the pressure medium entering the regulating chamber.

[0014] Furthermore, one end of the venting channel is connected to the regulating chamber, and the other end is connected to the low-pressure side of the system, forming a dynamic flow loop.

[0015] Furthermore, the silencing structure also includes a displacement detection element for detecting the displacement of the moving parts; and a controller electrically connected to the displacement detection element and the regulating valve, wherein the controller controls the opening degree of the regulating valve based on the displacement signal fed back by the displacement detection element.

[0016] Furthermore, the silencing structure also includes a first pressure sensing element and a second pressure sensing element. The first pressure sensing element is located at the upstream end of the central tube or in the compressor exhaust pipe and is used to detect the exhaust pressure. The second pressure sensing element is located in the regulating chamber and is used to detect the pressure inside the regulating chamber. Both the first and second pressure sensing elements are electrically connected to the controller, which controls the opening of the regulating valve based on the exhaust pressure and the pressure inside the regulating chamber.

[0017] Furthermore, an annular gap is formed between the inner wall of the sliding sleeve and the outer wall of the central tube. When the connecting port is opened, the airflow in the central tube enters the expansion chamber through the connecting port and the annular gap.

[0018] Furthermore, there are multiple connecting ports, which are distributed circumferentially along the central tube; there are also multiple pressure holes, which are distributed circumferentially along the central tube.

[0019] Furthermore, the expansion chamber is a closed cavity structure with lateral air intake and no independent exhaust port. After the airflow is radially injected into the expansion chamber through the connecting port, it returns to the internal channel of the central tube through the gap between the moving part and the central tube.

[0020] Furthermore, the first limiting part is a positioning boss provided on the outer wall of the central tube, and the second limiting part is a positioning boss provided on the inner wall of the sliding sleeve.

[0021] Furthermore, the expansion chamber is divided into multiple independent sub-expansion chambers along the axial direction by multiple partitions, and the sidewall of the central tube is provided with a communication port corresponding to the position of each sub-expansion chamber. When the movable member is in the second position, each communication port is in fluid communication with the corresponding sub-expansion chamber.

[0022] The present invention also provides a refrigeration device, including a compressor and an exhaust pipe connected to the exhaust port of the compressor, and further including a silencing structure of any of the above, wherein the silencing structure is connected in the exhaust pipe.

[0023] Furthermore, the refrigeration equipment is a water-cooled screw chiller unit.

[0024] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0025] The silencing structure and refrigeration equipment provided by the present invention achieves the separation of the driving air path and the silencing air path by setting an independent connecting port and a pressure hole on the central tube respectively. The connecting port is used to introduce airflow into the expansion chamber to achieve silencing, and the pressure hole is used to introduce high-pressure gas into the pressure supply chamber to drive the movement of the moving parts. This makes the movement control of the moving parts more precise and reliable.

[0026] By setting up a movable component that can switch between a first position and a second position in response to changes in the air pressure in the pressure chamber, real-time adaptive adjustment of the internal flow state of the silencing structure is achieved.

[0027] Compared to the fixed structure of existing technologies, this invention can dynamically change the flow cross-sectional area and exhaust back pressure of the silencer structure according to the compressor's operating load, effectively improving the pipeline flow capacity under low load conditions, avoiding the accumulation of oil and gas in the expansion chamber, and reducing lubricating oil residue.

[0028] At the same time, it can stably maintain the effective cavity volume, continuously ensure good noise reduction performance, avoid oil imbalance in the system, eliminate the need for frequent shutdowns to clean accumulated oil, reduce operation and maintenance costs, and significantly improve the stability and service life of the equipment under all operating conditions. Attached Figure Description

[0029] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily drawn to scale, and similar reference numerals may describe similar parts in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation, wherein:

[0030] Figure 1 A schematic diagram of a modular system with a noise reduction structure;

[0031] Figure 2 This is a schematic diagram of the axial section showing the central tube and expansion chamber in an isolated state during low-voltage industrial control.

[0032] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0034] Figure 5 This is a schematic diagram of the axial section showing the central tube and expansion chamber in a connected state during high-voltage industrial control.

[0035] Figure 6 for Figure 5 Enlarged diagram of point C in the middle.

[0036] Figure 7 for Figure 5Enlarged view of point D in the middle;

[0037] Figure 8 This is a schematic diagram of the axial section of the central tube.

[0038] Figure 9 for Figure 8 Enlarged view of point E in the middle;

[0039] Figure 10 This is a schematic diagram of the axial section of the sliding sleeve;

[0040] Figure 11 for Figure 10 Enlarged schematic diagram at point F in the middle.

[0041] Explanation of reference numerals in the attached figures:

[0042] Muffler housing 1;

[0043] Central tube 2;

[0044] First limiting part 21;

[0045] Slip sleeve 3;

[0046] Second limiting part 31;

[0047] Expansion chamber 4;

[0048] Regulation loop 5;

[0049] Pressure hole 6;

[0050] First connecting hole 7;

[0051] Adjust pressure chamber 8;

[0052] Return spring 9;

[0053] Electronic expansion valve 11;

[0054] Displacement sensor 12;

[0055] Second connecting hole 13;

[0056] First pressure sensing element 14;

[0057] Second pressure sensing element 15;

[0058] Partition 16. Detailed Implementation

[0059] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0060] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0061] like Figure 1 As shown, the silencing structure provided by one embodiment of the present invention is applied to the compressor exhaust system, and is particularly suitable for silencing the exhaust of refrigeration equipment such as water-cooled screw chillers.

[0062] like Figure 2 , 3 As shown in Figures 4 and 5, the silencing structure mainly includes a muffler housing 1, a central tube 2, a movable component (in this embodiment, an axially sliding sleeve 3), an expansion chamber 4, and an adjustment circuit 5.

[0063] like Figure 8 , 9 As shown in Figures 10 and 11, the muffler housing 1 has an axially extending internal cavity. A central tube 2 extends through the muffler housing 1 along its axial direction, and the upstream end of the central tube 2 is used to connect to the compressor's exhaust pipe to introduce an oil-gas mixture. The outer wall of the central tube 2 is provided with a first limiting part 21 (in this embodiment, it is a radially outward protrusion).

[0064] The sliding sleeve 3 is coaxially sleeved on the outside of the central tube 2. The inner wall of the sliding sleeve 3 is provided with a second limiting part 31 (a radial inner boss in this embodiment). The sliding sleeve 3 can slide axially relative to the central tube 2, and the downstream end of the sliding sleeve 3 is closed. The expansion chamber 4 is formed between the outer wall of the sliding sleeve 3 and the inner wall of the muffler housing 1.

[0065] The first limiting part 21 and the second limiting part 31, together with the outer wall surface of the central tube 2 and the inner wall surface of the sliding sleeve 3, form a pressure supply cavity.

[0066] The sidewall of the central tube 2 has two types of functionally independent hole structures: pressure hole 6 and first connecting hole 7.

[0067] Pressure hole 6 is located in the axial region of the corresponding pressure supply chamber on the side wall of the central tube 2. Pressure hole 6 connects the internal channel of the central tube 2 with the pressure supply chamber, allowing high-pressure gas in the central tube 2 to enter the pressure supply chamber through pressure hole 6, and establishing the air pressure that drives the sliding sleeve 3 to move in the pressure supply chamber.

[0068] There are multiple pressure orifices 6, evenly distributed along the circumference of the central tube 2, to ensure the uniformity of circumferential air pressure within the pressure supply chamber. An orifice diameter that is too large will cause excessive pressure fluctuations within the pressure supply chamber, while an orifice diameter that is too small will affect the response speed of pressure build-up.

[0069] The first connecting hole 7 is located in the axial region of the corresponding expansion chamber 4 on the side wall of the central tube 2, downstream of the pressure hole 6. The first connecting hole 7 is used to guide the airflow in the internal channel of the central tube 2 to the second connecting hole 13 on the sliding sleeve 3 when the sliding sleeve 3 is in the second position, and then introduce it into the expansion chamber 4 to achieve noise reduction.

[0070] The first connecting hole 7 and the pressure supply chamber are spatially isolated and do not communicate with each other. That is, the first connecting hole 7 and the pressure supply chamber are located at different axial positions on the side wall of the central tube 2, and are separated by the solid tube wall of the central tube 2, with no channel for them to communicate with each other. There are multiple first connecting holes 7, which are evenly distributed along the circumference of the central tube 2.

[0071] A second connecting hole 13 is provided on the side wall of the sliding sleeve 3 corresponding to the position of the first connecting hole 7. The second connecting holes 13 are distributed circumferentially along the sliding sleeve 3, and their number, diameter, and distribution position match those of the first connecting holes 7—that is, when the sliding sleeve 3 is in the second position, each first connecting hole 7 and each second connecting hole 13 are radially aligned, forming a complete channel for airflow. The second connecting hole 13 penetrates the tube wall of the sliding sleeve 3, with one end communicating with the annular gap between the central tube 2 and the sliding sleeve 3, and the other end communicating with the expansion chamber 4. The diameter of the second connecting hole 13 can be the same as or slightly larger than that of the first connecting hole 7 to ensure that there is no additional resistance when the airflow passes through.

[0072] "Alignment" of the first connecting hole 7 and the second connecting hole 13 means that they at least partially overlap in radial projection, allowing airflow to enter the expansion chamber 4 from the internal channel of the central tube 2 through the first connecting hole 7, the annular gap, and the second connecting hole 13; "offset" means that they do not overlap in radial projection, and the airflow path is blocked by the tube wall of the sliding sleeve 3.

[0073] The closed downstream end of the sliding sleeve 3 and the downstream end sealing plate of the muffler housing 1 form an adjusting pressure chamber 8. The adjusting pressure chamber 8 is provided with a reset element (in this embodiment, a coaxial reset spring 9 sleeved on the central tube 2).

[0074] The active pressure regulating circuit 5 draws out the pressure medium from the upstream end of the central pipe 2 (i.e. the compressor exhaust pipe), and after being throttled by the regulating valve (electronic expansion valve 11 in this embodiment), it flows into the regulating pressure chamber 8 to establish the target gas pressure.

[0075] The regulating pressure chamber 8 is also connected to the low-pressure side of the system (such as the high-pressure side of the condenser) through a preset venting channel, forming a dynamic flow loop from the high-pressure exhaust pipe through the regulating valve and the regulating pressure chamber 8 to the condenser, ensuring that the gas in the chamber flows continuously rather than stagnant and accumulates.

[0076] The system utilizes the pressure difference between the exhaust pipe and the condenser side as the driving force source.

[0077] When high-pressure gas enters the regulating chamber, it acts on a large area of ​​the closed end of the sliding sleeve 3, generating a total restoring force that works together with the return spring 9.

[0078] When the system is working, the high-temperature and high-pressure oil-gas mixture discharged from the compressor flows axially through the central pipe 2.

[0079] High-pressure gas in the central tube 2 enters the pressure supply chamber through the pressure hole 6, establishing air pressure within the chamber. This air pressure acts on the second limiting part 31 of the sliding sleeve 3, generating axial thrust according to F=P×S.

[0080] like Figure 2 , 3 As shown in Figure 4, under low load conditions, the exhaust flow rate is low, and the air pressure in the pressure supply chamber is not high. The thrust generated by the exhaust on the sliding sleeve 3 is insufficient to overcome the resistance of the reset mechanism. At this time, the controller commands the regulating valve to increase its opening, introducing high-pressure gaseous refrigerant from the exhaust pipe into the regulating pressure chamber 8.

[0081] When the sum of the air pressure in the regulating pressure chamber 8 and the elastic force of the return spring 9 exceeds the axial thrust generated by the high-pressure gas in the pressure supply chamber on the sliding sleeve 3, the sliding sleeve 3 remains in the first position (i.e., the initial position). In this position, the side wall of the sliding sleeve 3 completely blocks the connection port of the central tube 2, cutting off the airflow path between the internal channel of the central tube 2 and the expansion chamber 4, forcing the oil-containing gas to continue flowing along the internal channel of the central tube 2. This effectively prevents low-speed airflow from carrying oil droplets and depositing them in the expansion chamber 4, thus solving the problem of oil accumulation under low load at its source.

[0082] like Figure 5 , 6 As shown in Figure 7, under high load conditions, the exhaust velocity increases significantly, the pressure inside the central pipe 2 rises, and the air pressure entering the pressure supply chamber through the pressure hole 6 increases accordingly, resulting in a sharp increase in the axial thrust on the sliding sleeve 3. At the same time, the controller commands the regulating valve to reduce its opening, limiting the intake air flow and accelerating the gas release to the low-pressure side of the system, thereby minimizing the air pressure in the regulating pressure chamber 8.

[0083] When the axial thrust of the high-pressure gas in the pressure supply chamber on the sliding sleeve 3 is greater than the sum of the air pressure in the regulating pressure chamber 8 and the elastic force of the return spring 9, the sliding sleeve 3 overcomes the frictional resistance and moves axially to the second position. As the sliding sleeve 3 moves, the connecting port on the side wall of the central tube 2 gradually aligns with and completely overlaps with the expansion chamber 4, forming a bypass path from the internal channel of the central tube 2 through the connecting port into the expansion chamber 4.

[0084] The oil-containing gas is then radially injected into the expansion chamber 4 through the connecting port. Sound energy is dissipated through volume expansion, reflection, and friction, achieving efficient noise reduction. At this time, due to the extremely high flow velocity, the oil mist is rapidly carried through the expansion chamber 4 by the airflow, avoiding the risk of oil accumulation.

[0085] The expansion chamber 4 can adopt a closed cavity structure with lateral air intake and no independent exhaust port. Its noise reduction principle is based on the reflection and dissipation of sound waves within the volume. After the airflow enters the expansion chamber 4 through the connecting port, it returns to the downstream of the internal channel of the central tube 2 through the gap between the sliding sleeve 3 and the central tube 2.

[0086] Under high flow rate conditions, the ejector effect and pulsating pressure generated by the high-speed airflow can dynamically entrain and draw a small amount of oil mist and condensate in the chamber back into the main airflow channel, and carry it away with the mainstream.

[0087] In this embodiment, the pressure hole 6 and the connecting port are independently set on the central tube 2 and have separate functions.

[0088] The pressure port 6 is always connected to the pressure supply chamber, providing driving force for the movement of the sliding sleeve 3; the connecting port only connects the internal channel of the central tube 2 to the expansion chamber 4 when the sliding sleeve 3 is in the second position, so as to achieve the silencing function.

[0089] The two airflow paths do not interfere with each other, ensuring the independence and precision of the drive control.

[0090] In a preferred embodiment, the noise reduction structure also includes a displacement detection element (such as a magnetic induction switch or displacement sensor 12) for real-time monitoring of the actual position of the sliding sleeve 3.

[0091] The controller achieves closed-loop feedback control by comparing the deviation between the actual position and the target position: when the sliding sleeve 3 is detected to have reached the target position, the opening of the regulating valve is adjusted in a timely manner to maintain or change the pressure in the regulating chamber.

[0092] The system can also install a first pressure detection element 14 and a second pressure detection element 15 upstream of the air intake end of the muffler structure and the regulating pressure chamber 8 respectively to monitor the exhaust static pressure and the actual air pressure of the regulating chamber in real time.

[0093] Both serve as feedback signals for system load and actuator status, respectively, working together to achieve precise control. Based on dual-path feedback data, the controller automatically adjusts the regulating valve opening until the pressure accurately returns to its set value when it detects pipeline resistance or valve hysteresis causing the internal air pressure to deviate from the set value, ensuring a constant reset force.

[0094] This control mechanism gives the system a strong ability to adapt to extreme working conditions. During cold starts, it can quickly establish regulating air pressure to maintain a seal, and during sudden changes in high load, it can quickly reduce the regulating air pressure to ensure that the sliding sleeve 3 opens in time.

[0095] Meanwhile, the controllable adjustable air pressure provides a "damping buffer" effect for the movement of the sliding sleeve 3. During the transition of the sliding sleeve 3 from the first position to the second position, it can effectively offset the impact and sudden change brought about by the high-speed airflow, avoid violent shaking or mechanical impact caused by excessive instantaneous pressure difference, and ensure the smoothness and long-term reliability of the sliding sleeve 3 under all working conditions.

[0096] Preferably, a single connecting port can be expanded into multiple sets of stepped holes or graded openings with different diameters or different openings.

[0097] During low-load conditions, only the opening with the smallest flow area is opened to maintain minimal noise reduction; as the load increases, the opening with a larger area is opened step by step to achieve multi-level adaptive adjustment.

[0098] In addition to the sliding sleeve 3, the moving parts can also be in the form of rotary valve core, flap valve plate, etc., as long as they can switch between the first position and the second position to realize the on-off control of the flow path between the connecting port and the expansion chamber 4.

[0099] In addition to the electronic expansion valve 11, the regulating valve may also be an electric ball valve, an electric butterfly valve, a solenoid valve, or other controllable flow regulating elements.

[0100] In addition to helical springs, the reset element can also be a wave spring, disc spring, gas spring, or other components with energy storage and reset functions.

[0101] The pressure medium in the pressure chamber 8 is not limited to being drawn from the exhaust pipe; it can also be drawn from other high-pressure gas sources in the system, or an independent gas source device can be installed.

[0102] The pressure hole 6 is not limited to the area of ​​the corresponding pressure supply chamber of the central tube 2, but can also be set at other positions of the central tube 2, as long as it can introduce the pressurized gas in the central tube 2 into the pressure supply chamber; the pressure supply chamber can also be formed by other mating structures between the sliding sleeve 3 and the shell.

[0103] Furthermore, after reading this specification, those skilled in the art can make appropriate changes and adjustments to the sealing structure, connection method, control strategy, etc., between the various components. These are all equivalent substitutions of the present invention and fall within the protection scope of the present invention.

[0104] The present invention also provides a refrigeration device, including a compressor and an exhaust pipe connected to the exhaust port of the compressor, and further including a silencing structure according to any of the above embodiments, wherein the silencing structure is connected in the exhaust pipe.

[0105] This refrigeration equipment is particularly a water-cooled screw chiller unit, but it can also be other types of refrigeration equipment or compressor systems that require exhaust noise reduction.

[0106] Thanks to the aforementioned noise reduction structure, the refrigeration equipment can maintain stable noise reduction performance across all operating conditions, effectively avoiding noise reduction failure and system oil imbalance caused by low-load oil accumulation, and significantly improving operational reliability and service life.

[0107] As a further improvement to the above embodiment, the expansion chamber 4 is divided into multiple independent sub-expansion chambers 4 along the axial direction by multiple partitions 16.

[0108] Specifically, within the annular expansion chamber 4 formed between the outer wall of the sliding sleeve 3 and the inner wall of the muffler housing 1, a plurality of annular partitions 16 are arranged axially at intervals. The annular partitions 16 are fixedly connected to the inner wall of the muffler housing 1 or the outer wall of the sliding sleeve 3, dividing the expansion chamber 4 into a plurality of independent sub-expansion chambers 4 arranged axially.

[0109] Each of the sub-expansion chambers 4 is airtightly isolated by the partition 16, and adjacent sub-expansion chambers 4 are not directly connected to each other.

[0110] The sidewall of the central tube 2 is provided with at least one communication port corresponding to the axial position of each of the sub-expansion chambers 4. When the sliding sleeve 3 is in the second position, each communication port is in fluid communication with the corresponding sub-expansion chamber 4, and the airflow in the central tube 2 is radially injected into each of the sub-expansion chambers 4 through each communication port.

[0111] Each sub-expansion chamber 4 independently expands the airflow, reflects sound waves, and dissipates energy through friction, forming a multi-stage series silencing path.

[0112] Compared to a single expansion chamber 4 structure, multiple independent sub-expansion chambers 4 can provide multiple expansion reflection interfaces, effectively widening the noise reduction band, and are particularly effective in suppressing wideband airflow noise.

[0113] When the sliding sleeve 3 is in the first position, the side wall of the sliding sleeve 3 simultaneously blocks all the communication ports, and each of the sub-expansion chambers 4 is isolated from the internal channel of the central pipe 2. The oil-gas mixture only flows along the internal channel of the central pipe 2, and no oil will accumulate in each sub-expansion chamber 4 due to low load conditions.

[0114] When the sliding sleeve 3 is in the second position, each of the sub-expansion chambers 4 opens simultaneously. The high-velocity oil-gas mixture enters each of the sub-expansion chambers 4 through each of the connecting ports. The ejection effect generated by the high-speed airflow can synchronously carry the oil mist in each sub-expansion chamber 4 back to the main airflow channel, ensuring that each sub-expansion chamber 4 maintains good self-cleaning ability.

[0115] In an alternative embodiment, the partition 16 is fixedly disposed on the outer wall of the sliding sleeve 3 and moves axially synchronously with the sliding sleeve 3. The outer edge of each partition 16 slides and seals with the inner wall of the muffler housing 1, thereby maintaining an independent seal between each sub-expansion chamber 4 during the axial movement of the sliding sleeve 3.

[0116] In another alternative implementation, each of the connecting ports can be configured with different apertures, so that different sub-expansion chambers 4 can obtain different air intake flow rates and expansion ratios, thereby further optimizing the full-band noise reduction performance.

[0117] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0118] Although this document uses a number of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention. The order of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless otherwise expressly specified, and provided that the output of a preceding process is not used in a subsequent process. Similar sequential terms used for descriptive convenience (e.g., "firstly," "next," "secondly," "again," "then," etc.) do not imply that the actions must be performed in such an order.

[0119] Those skilled in the art will understand that all directional references (e.g., above, below, up, down, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to aid the reader's understanding and do not imply (e.g., a limitation on the scope of the invention as defined by the appended claims) a limitation on the location, orientation, or use of the invention, but are merely for the purpose of facilitating the description of this application 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 particular orientation or be constructed and operated in a particular orientation. The directional terms "inside" and "outside" refer to inside or outside relative to the outline of the respective component itself.

[0120] For ease of description, spatial relative terms such as "above," "on top of," "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 beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" 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.

[0121] Additionally, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or minor deviations in conditions, quantities, values, or dimensions, some of which are within manufacturing tolerances or limits. 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, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A noise reduction structure applied to a compressor exhaust system, characterized in that, include: case; A central tube is disposed inside the housing. The central tube has an internal channel for airflow, and the side wall of the central tube has a communication port and a pressure hole. A movable component is movably disposed on the outside of the central tube, and the movable component can switch between a first position and a second position relative to the central tube; An expansion chamber is formed within the housing; The movable component and the central tube enclose each other to form a pressure supply cavity. The pressure hole connects the internal channel of the central tube with the pressure supply cavity. The connecting port is not connected to the pressure supply cavity. The movable component is configured such that, when in the first position, the airflow path between the connecting port and the expansion chamber is blocked; and when in the second position, the connecting port is in fluid communication with the expansion chamber. The movable component switches between the first position and the second position in response to changes in air pressure within the pressure supply chamber, thereby altering the flow state of the silencing structure.

2. The noise-absorbing structure according to claim 1, characterized in that, The movable component is a sliding sleeve fitted on the outside of the central tube, and the sliding sleeve can slide axially relative to the central tube; The outer wall of the central tube is provided with a first limiting part, and the inner wall of the sliding sleeve is provided with a second limiting part. The first limiting part and the second limiting part enclose each other to form the pressure supply cavity. When the sliding sleeve is in the first position, the side wall of the sliding sleeve covers the communication port; when the sliding sleeve is in the second position, the communication port communicates with the expansion chamber.

3. The noise-absorbing structure according to claim 2, characterized in that, The pressure hole is located in the area corresponding to the pressure supply chamber on the side wall of the central tube. The airflow in the central tube enters the pressure supply chamber through the pressure hole to establish the air pressure that drives the sliding sleeve to move within the pressure supply chamber.

4. The noise-absorbing structure according to claim 2, characterized in that, One end of the sliding sleeve is closed, and the closed end of the sliding sleeve and the housing form an adjustment cavity. A reset member is provided in the adjustment cavity, and the reset member applies a biasing force toward the first position to the sliding sleeve. The noise reduction structure also includes an adjustment circuit, which is connected to the adjustment cavity and is used to introduce a pressure medium into the adjustment cavity to adjust the pressure inside the adjustment cavity.

5. The noise-absorbing structure according to claim 4, characterized in that, The regulating circuit includes a pressure tapping pipeline leading from the upstream end of the central tube, a regulating valve disposed on the pressure tapping pipeline, and a venting channel communicating with the regulating chamber; The regulating valve is used to regulate the flow rate of the pressure medium entering the regulating chamber.

6. The noise-absorbing structure according to claim 5, characterized in that, One end of the venting channel is connected to the regulating chamber, and the other end is connected to the low-pressure side of the system, forming a dynamic flow loop.

7. The noise-absorbing structure according to claim 4, characterized in that, It also includes a displacement detection element for detecting the displacement of the moving part; and The controller is electrically connected to the displacement detection element and the regulating valve, and controls the opening degree of the regulating valve according to the displacement signal fed back by the displacement detection element.

8. The noise-reducing structure according to claim 7, characterized in that, It also includes a first pressure detection element and a second pressure detection element. The first pressure detection element is disposed at the upstream end of the central tube or in the compressor exhaust pipe and is used to detect the exhaust pressure. The second pressure sensing element is disposed inside the regulating cavity and is used to detect the pressure inside the regulating cavity; Both the first pressure sensing element and the second pressure sensing element are electrically connected to the controller, and the controller controls the opening degree of the regulating valve according to the exhaust pressure and the pressure in the regulating chamber.

9. The noise-reducing structure according to any one of claims 2 to 8, characterized in that, An annular gap is formed between the inner wall of the sliding sleeve and the outer wall of the central tube. When the connecting port is opened, the airflow in the central tube enters the expansion chamber through the connecting port and the annular gap.

10. The noise-reducing structure according to any one of claims 2 to 8, characterized in that, The number of the connecting ports is multiple, and the multiple connecting ports are distributed circumferentially along the central tube; the number of the pressure holes is multiple, and the multiple pressure holes are distributed circumferentially along the central tube.

11. The noise-reducing structure according to any one of claims 2 to 8, characterized in that, The expansion chamber is a closed cavity structure with lateral air intake and no independent exhaust port. After the airflow is radially injected into the expansion chamber through the connecting port, it returns to the internal channel of the central tube through the gap between the movable part and the central tube.

12. The noise-reducing structure according to any one of claims 2 to 8, characterized in that, The first limiting part is a positioning boss provided on the outer wall of the central tube, and the second limiting part is a positioning boss provided on the inner wall of the sliding sleeve.

13. The noise-reducing structure according to any one of claims 2 to 8, characterized in that, The expansion chamber is divided into multiple independent sub-expansion chambers by multiple partitions along the axial direction. The side wall of the central tube is provided with a communication port corresponding to the position of each sub-expansion chamber. When the movable part is in the second position, each communication port is in fluid communication with the corresponding sub-expansion chamber.

14. A refrigeration device, comprising a compressor and an exhaust pipe connected to the exhaust port of the compressor, characterized in that, It also includes a muffler structure as described in any one of claims 1 to 13, the muffler structure being connected to the exhaust pipe.

15. The refrigeration equipment according to claim 14, characterized in that, The refrigeration equipment is a water-cooled screw chiller unit.

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