An expander volute assembly, an air circulating machine and a control method

Abstract

The application provides an expander volute assembly, an air circulating machine and a control method, wherein the expander volute assembly comprises a volute and a gas guide, the volute has an air inlet and an air outlet, the gas guide is used for sleeving on the air outlet and forms a heat exchange cavity between the volute and the gas guide, and the gas guide is used for introducing heat exchange gas into the heat exchange cavity; the volute is further provided with a connecting hole, the gas guide has a plug-in part, and the gas guide is plugged into the connecting hole through the plug-in part; and the expander volute assembly has a gas passing channel which is connected with the heat exchange cavity and the air inlet. According to the technical scheme of the application, the heat exchange gas which is heat exchanged with the air outlet flows into the air inlet of the volute along the gas passing channel from the heat exchange cavity, so as to be sucked into the volute to participate in work and be reused, and the purpose of recycling the residual pressure of the heat exchange gas is achieved, thereby the energy loss can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of air circulator technology, specifically relating to an expander volute assembly, an air circulator, and a control method. Background Technology

[0002] like Figure 1 As shown, an air circulator used in a compressed air circulating refrigeration system includes an expander with a volute 6. The volute 6 has an inlet T01 and an outlet 1. The outlet 1 has an outlet T02. The expander takes in air through the inlet T01 and exits through the outlet T02. Gas enters the expander through the inlet T01, expands, and performs work. The temperature of the gas decreases after the work is done, and the low-temperature gas flows out through the outlet T02 and is transported to the area requiring cooling. The expansion work drives the compressor to draw in air from CO1, compress it, and discharge it from CO2. The temperature at the outlet T02 is generally below zero degrees Celsius, even below -40 degrees Celsius, making it prone to icing and affecting the reliable operation of the air circulator. Currently, icing is generally prevented by directing the high-temperature gas from the compressor outlet CO2 to the outer wall surface of the outlet 1, allowing heat exchange between the high-temperature gas and the outlet 1. The gas that is led from the compressor outlet CO2 to the outer wall surface of the outlet section 1 for heat exchange can be called the heat exchange gas. The heat exchange gas used for anti-icing has a relatively high airflow pressure. If the heat exchange gas is not effectively utilized after heat exchange with the outlet section 1, it will cause energy loss, thereby reducing the efficiency of air circulation. Summary of the Invention

[0003] Therefore, the present invention provides an expander volute assembly, an air circulator, and a control method. The main technical problem to be solved is how to recover and utilize the residual pressure of the heat exchange gas to reduce energy loss.

[0004] To solve the above problems, the present invention provides an expander volute assembly, which includes a volute and an air guide. The volute has an air inlet and an air outlet. The air guide is used to be sleeved on the air outlet and forms a heat exchange cavity between the two. The air guide is used to introduce heat exchange gas into the heat exchange cavity.

[0005] The volute is also provided with a connecting hole, and the air guide has a plug-in part, through which the air guide is plugged into the connecting hole; the expander volute assembly has an air passage connecting the heat exchange chamber and the air inlet.

[0006] In some embodiments, the direction in which the plug is inserted into the connecting hole is defined as a first direction, and the connecting hole has a first hole segment and a second hole segment connected in sequence along the first direction; a first sealing ring is fitted on the plug, and the plug is sealed to the second hole segment through the first sealing ring;

[0007] Wherein, an air passage is formed between the plug-in part and the first hole section, the air passage includes an air passage section and a first air passage hole disposed on the first hole section, the air passage section connects the heat exchange chamber and the air passage chamber, and the first air passage hole penetrates to the inner wall of the air inlet; the inner diameter of the first hole section is D60204, the inner diameter of the second hole section is D60206, D60204 is greater than D60206, and (D60204-D60206) / D60206=0.003~0.03.

[0008] In some embodiments, the first hole segment is an annular groove arranged around the center line of the connecting hole, the inner diameter of the bottom surface of the annular groove is D60204, and the first vent hole is arranged on the bottom surface of the annular groove.

[0009] In some embodiments, the diameter of the first vent hole is D601, wherein D601 / D60204 = 0.01 to 0.1.

[0010] In some embodiments, the annular groove has a first annular groove wall connecting the bottom surface and the second hole segment. The first annular groove wall is in the shape of a frustum cone, and the second hole segment is a straight hole segment. The center lines of the first annular groove wall and the second hole segment coincide. The angle between the first annular groove wall and its center line is a2, where a2 = 10° to 30°.

[0011] In some embodiments, the connecting hole further has a third hole segment connected to the first hole segment, the third hole segment being located on the side of the first hole segment opposite to the second hole segment; the insertion part is fitted with a second sealing ring, and the insertion part is sealed to the third hole segment through the second sealing ring.

[0012] In some embodiments, the inner diameter of the third hole segment is D60202, and D60206 is less than or equal to D60202.

[0013] In some embodiments, the air venting section includes a second air vent disposed on the air guide member to connect the heat exchange chamber and the air venting chamber; wherein the centerline of the second air vent coincides with the centerline of the first air vent.

[0014] In some embodiments, the connecting hole has a flared section at the opening, the flared section being a frustoconical hole section, and the angle between the hole wall of the flared section and its centerline being a1, where a1 = 10° to 30°.

[0015] In some embodiments, the expander volute assembly further comprises a temperature sensor configured to detect the temperature of the gas flow in the gas passage, and a flow control structure configured to adjust the flow of the heat exchange gas into the heat exchange cavity.

[0016] The application also provides an air cycle machine comprising the expander volute assembly of any one of the above.

[0017] The application also provides a control method of an air cycle machine, when the expander volute assembly further comprises a temperature sensor configured to detect the temperature of the gas flow in the gas passage, and a flow control structure configured to adjust the flow of the heat exchange gas into the heat exchange cavity, the control method comprising:

[0018] Step S1: after the air cycle machine is operated for a first preset time, the temperature sensor detects the temperature of the gas flow in the gas passage to obtain a collection temperature t71;

[0019] Step S2: after the air cycle machine is continuously operated for a second preset time, the temperature sensor detects the temperature of the gas flow in the gas passage to obtain a collection temperature t72; if t71 is greater than t72, and (t71-t72) / t71≥50%~80%, the flow of the heat exchange gas into the heat exchange cavity is increased.

[0020] In some embodiments, the method further comprises the following steps after the step S2:

[0021] Step S3: after the air cycle machine is continuously operated for a third preset time, the temperature sensor detects the temperature of the gas flow in the gas passage to obtain a collection temperature t73; if t73 is greater than t72, and (t73-t72) / t73≥50%~80%, the flow of the heat exchange gas into the heat exchange cavity is decreased to the initial value.

[0022] The expander volute assembly, the air cycle machine and the control method provided by the application have the following advantages:

[0023] 1. The gas guide member introduces the heat exchange gas into the heat exchange cavity, and the heat exchange gas is high-temperature gas. After the heat exchange gas flows into the heat exchange cavity, the heat exchange gas can exchange heat with the outlet part to heat the outlet part and prevent the outlet part from icing. The heat exchange gas after heat exchange with the outlet part flows into the inlet of the volute along the gas passage from the heat exchange cavity to be sucked into the volute to participate in work and be reused, so that the residual pressure of the heat exchange gas can be recycled, thereby reducing energy loss.

[0024] 2. By making (D60204-D60206) / D60206 = 0.003 to 0.03, the present invention can prevent the first sealing ring from being scratched when it crosses the first air outlet, and also make the air outlet cavity have a suitable volume, which is conducive to the airflow L3 of the air outlet section crossing the air outlet cavity and entering the first air outlet.

[0025] 3. The temperature sensor and flow control structure work together to control the flow rate of the heat exchange gas flowing into the heat exchange chamber based on the temperature of the airflow in the air passage, which solves the problem that a fixed flow rate cannot adapt to de-icing and improves the anti-icing effect. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the working principle of an air circulator;

[0028] Figure 2 This is a partial cross-sectional view of an expander volute assembly provided in an embodiment of the present invention;

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a cross-sectional view of the structural portion of the volute of the present invention;

[0031] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0032] Figure 6 This is a partial cross-sectional view of another expander volute assembly provided in an embodiment of the present invention.

[0033] The attached figures are labeled as follows:

[0034] 1, outlet part; 2, air guide member; 4, third sealing ring; 5, fourth sealing ring; 6, volute; 7, first sealing ring; 8, second sealing ring; 9, temperature sensor; 10, flow control structure; 21, plug-in part; 61, connecting hole; 62, air passage; 201, air inlet hole; q01, heat exchange cavity; q02, air passage cavity; 101, outer surface of outlet part; 102, inner surface of outlet part; 202, second air passage hole; 203, inner surface of air guide member; 204, outer surface of plug-in part; 601, first air passage hole; 602, first hole section; 603, air inlet; 60201, flared section; 60202, third hole section; 60203, second annular groove wall; 60204, bottom surface of annular groove; 60205, first annular groove wall; 60206, second hole section; a, first direction. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0037] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a dependent "above" or "upper" becomes a "below" or "lower" device. Thus, the example term "above" can encompass both an "above" and "below" orientation. The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatial relative terms used herein interpreted accordingly.

[0038] In addition, it should be noted that the use of "first", "second", and the like, terminology to describe various components in the examples herein is merely used to differentiate one element from another, and does not imply a special order, and should not be necessarily construed to imply that the corresponding elements must be used in a special order. Thus, the use of "first", "second", and the like, terminology does not limit the scope of the application, unless otherwise specified.

[0039] With reference to the accompanying drawings, the embodiments of the present application are described below. Figures 2-5 As shown in the drawings, according to the embodiments of the present application, an expander volute assembly is provided, which comprises a volute 6 and a gas guide 2. The volute 6 has an inlet 603 and an outlet 1. The gas guide 2 is arranged on the outlet 1 to form a heat exchange cavity q01 therebetween. The gas guide 2 is used to introduce heat exchange gas into the heat exchange cavity q01 to exchange heat with the outlet 1. The volute 6 is further provided with a connecting hole 61, and the gas guide 2 is provided with a plug-in part 21. The gas guide 2 is plugged into the connecting hole 61 through the plug-in part 21. The expander volute assembly has a gas passage 62 which communicates the heat exchange cavity q01 and the inlet 603.

[0040] In the above example, the gas guide 2 introduces heat exchange gas into the heat exchange cavity q01. The heat exchange gas is high-temperature gas. After flowing into the heat exchange cavity q01, the heat exchange gas exchanges heat with the outlet 1 to heat the outlet 1 to prevent the outlet 1 from icing. The heat exchange gas after exchanging heat with the outlet 1 flows into the inlet 603 of the volute 6 along the gas passage 62 from the heat exchange cavity q01 to be reused by being sucked into the volute 6 to do work, thereby achieving the purpose of recycling the residual pressure of the heat exchange gas, so as to reduce energy loss.

[0041] In some embodiments, the outlet 1 is an expander wheel cover of the volute 6.

[0042] In some embodiments, the direction in which the plug-in portion 21 is inserted into the connecting hole 61 is defined as the first direction a. The connecting hole 61 has a first hole section 602 and a second hole section 60206 connected in sequence along the first direction a. The plug-in portion 21 is provided with the first sealing ring 7, and the plug-in portion 21 is in sealing cooperation with the second hole section 60206 through the first sealing ring 7. The plug-in portion 21 and the first hole section 602 form a gas passage cavity q02, and the gas passage 62 includes a gas passage section and a first gas passage hole 601 provided on the first hole section 602. The gas passage section is in communication with the heat exchange cavity q01 and the gas passage cavity q02. The first gas passage hole 601 penetrates the inner wall of the air inlet 603 to communicate with the air inlet 603. The inner diameter of the first hole section 602 is D60204, the inner diameter of the second hole section 60206 is D60206, D60204 is greater than D60206, and (D60204-D60206) / D60206=0.003-0.03. Preferably, (D60204-D60206) / D60206=0.01.

[0043] The gas passage 62 is in communication with the heat exchange cavity q01 through the gas passage section, and in communication with the air inlet 603 through the first gas passage hole 601.

[0044] In the above example, the first sealing ring 7 can prevent the first gas passage hole 601 from leaking from the second hole section 60206. When the plug-in portion 21 is inserted into the connecting hole 61, the first sealing ring 7 is easily scratched by the hole edge when passing through the first gas passage hole 601, thereby causing the sealing performance to fail. In addition, if D60204 is much larger than D60206, the volume of the gas passage cavity q02 is large, which is not conducive to the gas flow L3 of the gas passage section passing through the gas passage cavity q02 and entering the first gas passage hole 601. Therefore, by making (D60204-D60206) / D60206=0.003-0.03, on the one hand, the first sealing ring 7 can be prevented from being scratched when passing through the first gas passage hole 601, and on the other hand, the gas passage cavity q02 can have a suitable volume, which is conducive to the gas flow L3 of the gas passage section passing through the gas passage cavity q02 and entering the first gas passage hole 601.

[0045] In some embodiments, the first hole section 602 described above can be an annular groove provided around the center line of the connecting hole 61, the inner diameter of the bottom surface 60204 of the annular groove is the aforementioned D60204, and the first gas passage hole 601 is provided on the bottom surface 60204 of the annular groove. The opening of the first gas passage hole 601 on the bottom surface 60204 of the annular groove is a first opening, and the width W60204 of the bottom surface 60204 of the annular groove includes the opening edge of the first opening, so as to avoid scratching the first sealing ring 7 when the plug-in portion 21 is inserted into the connecting hole 61.

[0046] In the above example, by designing the first hole section 602 as an annular groove, the aforementioned purpose of D60204 being greater than D60206 can be achieved.

[0047] In some embodiments, as shown in Figure 4 the diameter of the aforementioned first gas passage hole 601 is D601, wherein D601 / D60204 = 0.01-0.1. Preferably, D601 / D60204 = 0.044.

[0048] In the above example, if the diameter D601 of the first gas passage hole 601 is too small, it is not conducive to the flow of the gas flow into the aforementioned air inlet 603. Since the first gas passage hole 601 is arranged on the bottom surface 60204 of the annular groove, the diameter of the first gas passage hole 601 is not easy to be too large, and if it is too large, there is a problem of sudden increase in the cross-sectional area of the second gas passage hole 202 to the gas passage hole 601. If the cross-sectional area is too large, vortex loss will be formed, which is not conducive to the flow of the gas flow L3. By making D601 / D60204 = 0.01-0.1, on the one hand, it is conducive to the flow of the gas flow into the aforementioned air inlet 603, and on the other hand, it is also convenient for processing.

[0049] In some embodiments, as shown in Figures 4-5 the aforementioned annular groove has a first annular groove wall 60205 connecting the bottom surface 60204 and the second hole section 60206, the first annular groove wall 60205 is in the shape of a truncated cone, and the second hole section 60206 is a straight hole section. The center lines of the first annular groove wall 60205 and the second hole section 60206 coincide. The included angle between the first annular groove wall 60205 and the center line thereof is a2, and a2 = 10°-30°. Preferably, a2 = 20°.

[0050] In the above example, the included angle between the first annular groove wall 60205 and the center line thereof is the included angle between the first annular groove wall 60205 and the second hole section 60206. If the included angle a2 between the first annular groove wall 60205 and the second hole section 60206 is too large, the guiding property of the insertion part 21 inserted into the connecting hole 61 is poor, and if a2 is too small, the first annular groove wall 60205 is too wide, and the space is limited and difficult to realize. By making a2 = 10°-30°, on the one hand, the guiding property of the insertion part 21 inserted into the connecting hole 61 can be improved, and on the other hand, processing is facilitated.

[0051] In some embodiments, as shown in Figure 3 the aforementioned connecting hole 61 further has a third hole section 60202 connected with the first hole section 602, and the third hole section 60202 is located on the side of the first hole section 602 away from the second hole section 60206. The aforementioned insertion part 21 is sleeved with a second sealing ring 8, and the insertion part 21 is sealingly matched with the third hole section 60202 through the second sealing ring 8.

[0052] In the above example, the second sealing ring 8 can prevent the first gas passage hole 601 from leaking gas from the third hole section 60202. The cooperation of the second sealing ring 8 and the aforementioned first sealing ring 7 can seal both sides of the first hole section 602, thereby improving the sealing performance of the aforementioned gas passage cavity q02 and preventing the gas passage cavity q02 from leaking gas.

[0053] In some embodiments, the inner diameter of the third hole section 60202 is D60202, and D60206 is less than or equal to D60202, which is conducive to the insertion of the insertion part 21 into the connecting hole 61 and facilitates processing.

[0054] In some embodiments, as shown in Figure 3 The aforementioned gas passage section can include a second gas passage hole 202 provided on the gas guide member 2, and the gas passage section communicates the heat exchange cavity q01 and the gas passage cavity q02 through the second gas passage hole 202. The center line of the second gas passage hole 202 coincides with the center line of the first gas passage hole 601, which is conducive to the flow of gas in the second gas passage hole 202 into the first gas passage hole 601, and has the effect of facilitating gas passage.

[0055] In some embodiments, as shown in Figure 3 The aforementioned connecting hole 61 has a flared section 60201 at the opening, which is a frustoconical hole section. The included angle between the hole wall of the flared section 60201 and the center line thereof is a1, and a1 = 10°-30°. Preferably, a1 = 20°.

[0056] In the above example, if the included angle a1 between the hole wall of the flared section 60201 and the center line thereof is too large, the guiding property of the insertion of the insertion part 21 into the connecting hole 61 is poor, and if a1 is too small, the hole wall of the flared section 60201 is too wide, and the space is limited and difficult to realize. By making a1 = 10°-30°, the guiding property of the insertion of the insertion part 21 into the connecting hole 61 can be improved, and the processing is facilitated.

[0057] In some embodiments, the aforementioned third hole section 60202 is a straight hole section, and the center lines of the aforementioned flared section 60201 and the third hole section 60202 coincide.

[0058] It should be noted that in some embodiments, the hole wall of the second hole section 60206, the hole wall of the third hole section 60202, and the bottom surface 60204 of the annular groove all are cylindrical surfaces, and the center lines thereof coincide.

[0059] In some embodiments, as shown in Figure 6As shown, the foregoing expander volute assembly can further comprise a temperature sensor 9 and a flow control structure 10. The temperature sensor 9 is configured to detect the temperature of the gas flow in the gas passage 62. The flow control structure 10 is configured to adjust the flow rate of the heat exchange gas flowing into the heat exchange cavity q01.

[0060] In the foregoing example, the temperature sensor 9 and the flow control structure 10 can cooperate to control the flow rate of the heat exchange gas flowing into the heat exchange cavity q01 according to the temperature of the gas flow in the gas passage 62.

[0061] In some embodiments, the foregoing flow control structure 10 can comprise a regulating valve, and the flow control structure 10 can adjust the flow rate of the heat exchange gas flowing into the heat exchange cavity q01 through the regulating valve.

[0062] The present application also provides an air cycle machine, which can comprise the foregoing expander volute assembly. In the air cycle machine, the gas guide 2 introduces the heat exchange gas, which is a high-temperature gas, into the heat exchange cavity q01, and the heat exchange gas flowing into the heat exchange cavity q01 can exchange heat with the outlet 1 to heat the outlet 1 and prevent the outlet 1 from icing. The heat exchange gas after exchanging heat with the outlet 1 flows into the gas inlet 603 of the volute 6 along the gas passage 62 from the heat exchange cavity q01 to be reused by being sucked into the volute 6 to participate in work, so as to achieve the purpose of recycling the residual pressure of the heat exchange gas and reduce energy loss.

[0063] The present application also provides a control method of an air cycle machine. When the expander volute assembly further comprises a temperature sensor 9 and a flow control structure 10, the temperature sensor 9 is configured to detect the temperature of the gas flow in the gas passage 62, and the flow control structure 10 is configured to adjust the flow rate of the heat exchange gas flowing into the heat exchange cavity q01, the control method comprises the following steps:

[0064] Step S1: After the air cycle machine is started and operated for a first preset time X, the temperature sensor 9 detects the temperature of the gas flow in the gas passage 62 to obtain a collected temperature t71. The first preset time X is 2-10 minutes, and preferably, X is 5 minutes.

[0065] Step S2: After the air cycle machine continues to operate for a second preset time, the temperature sensor 9 detects the temperature of the gas flow in the gas passage 62 to obtain a collected temperature t72. If t71 is greater than t72, and (t71-t72) / t71≥50%-80%, the flow rate of the heat exchange gas flowing into the heat exchange cavity q01 is increased.

[0066] In the above example, if t71 is greater than t72, and (t71-t72) / t71≥50%~80%, it indicates that the outflow part 1 has icing phenomenon, at this time, by increasing the flow of the heat exchange gas flowing into the heat exchange cavity q01, the heat exchange between the heat exchange gas and the outflow part 1 is improved, and the icing is reduced.

[0067] In some embodiments, after step S2, further comprising:

[0068] Step S3: After the air circulating machine continues to run for a third preset time, the temperature sensor 9 detects the temperature of the air flow of the air passage 62, and obtains the collected temperature t73. If t73 is greater than t72, and (t73-t72) / t73≥50%~80%, the flow of the heat exchange gas flowing into the heat exchange cavity q01 is reduced to the initial value.

[0069] In the above example, if t73 is greater than t72, and (t73-t72) / t73≥50%~80%, it indicates that the icing phenomenon of the outflow part 1 has been eliminated, at this time, by reducing the flow of the heat exchange gas flowing into the heat exchange cavity q01 to the initial value, the introduction of the heat exchange gas can be reduced, and the energy loss can be reduced.

[0070] It should be noted that in step S1, the flow of the heat exchange gas flowing into the heat exchange cavity q01 is the initial value G10. In step S2, after increasing the flow of the heat exchange gas flowing into the heat exchange cavity q01, the flow of the heat exchange gas flowing into the heat exchange cavity q01 is G11, which is greater than G10. In step S3, after reducing the flow of the heat exchange gas flowing into the heat exchange cavity q01, the flow of the heat exchange gas flowing into the heat exchange cavity q01 is the initial value G10. The unit of the flow of the heat exchange gas is kg / s.

[0071] The present application effectively solves the problem of icing at the air outlet, and fully utilizes the residual pressure energy of the anti-icing gas flow, i.e. the aforementioned heat exchange gas, to ensure that the air circulating machine can operate reliably with high performance. Further, by setting the temperature sensor 9 and the flow control structure 10, the problem of fixed flow not being able to adapt to deicing is solved, and the anti-icing effect is improved.

[0072] For the convenience of understanding, the overall structure of the present application is described below, and the working principle is described.

[0073] As Figure 2As shown, the air guide 2 can draw a small stream of high-temperature, high-pressure airflow L1 from the compressor outlet CO2. It flows through the inlet 201 and into the heat exchange chamber q01. The high-temperature airflow L2 surrounds the outer surface 101 of the outlet section 1, transferring heat to the outlet section 1 and preventing ice formation on the inner surface 102 of the outlet section 1. After the airflow L2 heats the outlet section 1, its temperature decreases, but its pressure remains high, forming a low-temperature, high-pressure airflow L3. The airflow L3 passes through the second outlet 202, through the outlet chamber q02, and flows into the inlet 603 from the first outlet 601, participating in the work.

[0074] like Figure 2 As shown, the heat exchange chamber q01 is formed by the outer surface 101 of the air outlet 1, the inner surface 203 of the air guide 2, the third sealing ring 4, and the fourth sealing ring 5. The heat exchange chamber q01 has an air inlet 201 and a second air outlet 202. The high-temperature and high-pressure airflow L1 flows into the heat exchange chamber q01 in an orderly manner from the air inlet 201. The airflow L2 in the heat exchange chamber q01 flows around the outer surface 101 of the air outlet 1 to form airflow L3, and the airflow L3 flows out of the heat exchange chamber q01 through the second air outlet 202.

[0075] like Figure 2 As shown, the air vent q02 is formed by the outer surface 204 of the insertion part 21, the first hole section 602, the second sealing ring 8, and the first sealing ring 7. The air vent q02 has a second air vent 202 and a first air vent 601. The airflow L3 flows into the air vent q02 in an orderly manner from the second air vent 202, and the gas in the air vent q02 flows out of the air vent q02 through the first air vent 601. Both the second air vent 202 and the first air vent 601 are preferably round holes, and their centerlines coincide to reduce flow loss.

[0076] like Figure 3 As shown. The aforementioned connecting hole 61 has a flared section 60201, a third hole section 60202, a second groove wall 60203, a bottom surface 60204 of an annular groove, a first annular groove wall 60205, and a second hole section 60206. The flared section 60201, the third hole section 60202, the second annular groove wall 60203, the bottom surface 60204 of the annular groove, the first annular groove wall 60205, and the second hole section 60206 are connected by arcs, the radius of which is R, where R = 0.1 to 2 mm.

[0077] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0078] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An expander volute assembly characterized by: The expansion machine volute assembly comprises a volute (6) and a gas guide member (2), the volute (6) has an air inlet (603) and an air outlet (1), the gas guide member (2) is arranged on the air outlet (1) and forms a heat exchange cavity (q01) between the volute (6) and the gas guide member (2), and the gas guide member (2) is used for introducing heat exchange gas into the heat exchange cavity (q01); The volute (6) is provided with a connecting hole (61), the gas guide member (2) is provided with a plug-in part (21), and the plug-in part (21) is plugged into the connecting hole (61); the expansion machine volute assembly has a gas passage (62) communicating the heat exchange cavity (q01) and the air inlet (603).

2. The expansion machine volute assembly according to claim 1, wherein: a first direction (a) is defined as a direction in which the plug-in part (21) is inserted into the connecting hole (61), the connecting hole (61) has a first hole section (602) and a second hole section (60206) connected in sequence along the first direction (a), the plug-in part (21) is provided with a first sealing ring (7), and the plug-in part (21) is in sealing cooperation with the second hole section (60206) through the first sealing ring (7); wherein a gas passage cavity (q02) is formed between the plug-in part (21) and the first hole section (602), the gas passage (62) comprises a gas passage section and a first gas passage hole (601) arranged on the first hole section (602), the gas passage section communicates the heat exchange cavity (q01) and the gas passage cavity (q02), and the first gas passage hole (601) penetrates the inner wall of the air inlet (603); the inner diameter of the first hole section (602) is D60204, the inner diameter of the second hole section (60206) is D60206, D60204 is greater than D60206, and (D60204-D60206) / D60206=0.003-0.

03.

3. The expansion machine volute assembly according to claim 2, wherein: the first hole section (602) is an annular groove arranged around the center line of the connecting hole (61), the inner diameter of the bottom surface (60204) of the annular groove is D60204, and the first gas passage hole (601) is arranged on the bottom surface (60204) of the annular groove.

4. The expansion machine volute assembly according to claim 3, wherein: the diameter of the first gas passage hole (601) is D601, and D601 / D60204=0.01-0.

1.

5. The expansion machine volute assembly according to claim 3 or 4, wherein: The annular groove has a first annular groove wall connecting the bottom surface (60204) and the second hole section (60206), the first annular groove wall (60205) is in the form of a frustum-shaped hole, the second hole section (60206) is a linear hole section, the center lines of the first annular groove wall (60205) and the second hole section (60206) coincide, and the included angle between the first annular groove wall (60205) and the center line thereof is a2, a2=10°-30°.

6. The expander volute assembly according to any one of claims 2-4, characterized in that: The connecting hole (61) further has a third hole section (60202) connected with the first hole section (602), the third hole section (60202) is located on the side of the first hole section (602) away from the second hole section (60206); the plug-in part (21) is sleeved with a second sealing ring (8), and the plug-in part (21) is in sealing cooperation with the third hole section (60202) through the second sealing ring (8).

7. The expander volute assembly according to claim 6, characterized in that: The inner diameter of the third hole section (60202) is D60202, and D60206 is less than or equal to D60202.

8. The expander volute assembly according to any one of claims 2-4, 7, characterized in that: The gas passage section comprises a second gas passage hole (202) arranged on the gas guide part (2) to communicate the heat exchange cavity (q01) and the gas passage cavity (q02) through the second gas passage hole (202); wherein the center line of the second gas passage hole (202) coincides with the center line of the first gas passage hole (601).

9. The expander volute assembly according to any one of claims 1-4, 7, characterized in that: The connecting hole (61) has a flared section (60201) at the opening, the flared section (60201) is a frustum-shaped hole section, and the included angle between the hole wall of the flared section (60201) and the center line thereof is a1, a1=10°-30°.

10. The expander volute assembly of any one of claims 1-4, 7, wherein: Further comprising a temperature sensor (9) and a flow control structure (10), the temperature sensor (9) is used for detecting the temperature of the gas flow in the gas passage (62), and the flow control structure (10) is used for adjusting the flow of the heat exchange gas flowing into the heat exchange cavity (q01).

11. An air circulating machine characterized by: The expander volute assembly according to any one of claims 1-10.

12. A control method for the air circulating machine of claim 11, characterized by: When the expander volute assembly further comprises a temperature sensor (9) and a flow control structure (10), the temperature sensor (9) is used for detecting the temperature of the gas flow in the gas passage (62), and the flow control structure (10) is used for adjusting the flow of the heat exchange gas flowing into the heat exchange cavity (q01), the control method comprises: Step S1: After the air circulating machine is operated for a first preset time, the temperature sensor (9) detects the temperature of the gas flow in the gas passage (62) to obtain an acquisition temperature t71. Step S2: the temperature sensor (9) detects the temperature of the airflow of the air passage (62) after the air circulating machine continues to run for a second preset time, and obtains an acquisition temperature t72; if t71 is greater than t72, and (t71-t72) / t71≥50%~80%, the flow of the heat exchange gas flowing into the heat exchange cavity (q01) is increased.

13. The control method of an air cycle machine according to claim 12, characterized by: After the step S2, it further includes: Step S3: the temperature sensor (9) detects the temperature of the airflow of the air passage (62) after the air circulating machine continues to run for a third preset time, and obtains an acquisition temperature t73; if t73 is greater than t72, and (t73-t72) / t73≥50%~80%, the flow of the heat exchange gas flowing into the heat exchange cavity (q01) is decreased to the initial value.

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