A water return device

Abstract

The present application relates to the technical fields of engine test, and specifically discloses a water return device, which comprises a shielding pipeline, a drain pipe and a water return pipeline, the shielding pipeline is provided with an electromagnetic shielding structure, the water outlet end of the drain pipe is inserted into the water inlet end of the shielding pipeline with a gap, a splash-proof cover is arranged on the outer wall of the drain pipe, the open end of the splash-proof cover is arranged around the water inlet end of the shielding pipeline with a gap, the water inlet end of the water return pipeline is arranged around the water outlet end of the shielding pipeline, and the inner wall of the water inlet end of the water return pipeline and the outer wall of the water outlet end of the shielding pipeline are arranged with a gap. The water return device can avoid electromagnetic leakage, ensure the accuracy of electromagnetic compatibility test results of the whole machine, avoid affecting torque measurement, avoid water splashing at the gap, avoid condensate accumulation and steam leakage, and make the test environment in the shielding room meet the requirements of relevant standards and specifications.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine test, in particular to a backwater device. BACKGROUND

[0002] When an aero-engine is developed for electromagnetic compatibility test, it needs to be connected with a power absorption and measurement device to absorb and measure the shaft power generated by the aero-engine. Among them, the straight-flow type hydraulic dynamometer is a relatively common power absorption and measurement device.

[0003] The existing straight-flow type hydraulic dynamometer is generally composed of a drain pipe and a backwater adapter, so that the backwater of the dynamometer can be drained to the backwater adapter through the drain pipe, and then drained to the backwater pool through the backwater adapter. However, because the drain pipe and the backwater adapter are generally connected in a non-contact manner, water splashing is prone to occur at the gap between the two. Or, because the backwater temperature of the dynamometer is relatively high, condensate water aggregation and steam leakage are prone to occur outside, thereby polluting the environment of the shielded room and making the test environment in the shielded room difficult to meet the requirements of relevant standards and specifications. At the same time, electromagnetic leakage is prone to occur during the process of draining the backwater of the dynamometer through the drain pipe, thereby affecting the accuracy of the results of the whole machine electromagnetic compatibility test. SUMMARY

[0004] In view of the above problems, the present application provides a backwater device, comprising:

[0005] A shielded pipeline is provided with an electromagnetic shielding structure;

[0006] A drain pipe is inserted into the water inlet end of the shielded pipeline at the water outlet end, and the outer wall of the water outlet end of the drain pipe is gap-set with the inner wall of the water inlet end of the shielded pipeline;

[0007] A splash-proof cover is provided on the outer wall of the drain pipe around the circumference of the drain pipe, the open end of the splash-proof cover is surrounded by the water inlet end of the shielded pipeline, and the inner wall of the open end of the splash-proof cover is gap-set with the outer wall of the water inlet end of the shielded pipeline;

[0008] A backwater pipeline is surrounded by the water outlet end of the shielded pipeline at the water inlet end, and the inner wall of the water inlet end of the backwater pipeline is gap-set with the outer wall of the water outlet end of the shielded pipeline.

[0009] In some embodiments, the shielded pipeline comprises:

[0010] A waveguide tube, and the electromagnetic shielding structure is arranged in the waveguide tube;

[0011] A splash-proof pipe is connected to one end of the waveguide pipe, and the end of the splash-proof pipe away from the waveguide pipe forms the water inlet end of the shielding pipe, and the end of the waveguide pipe away from the splash-proof pipe forms the water outlet end of the shielding pipe.

[0012] In some embodiments, a flange surface is fixedly arranged on the outer circumferential surface of the waveguide pipe, and a shielding shell is movably sleeved on the outer circumferential surface of the waveguide pipe.

[0013] The bottom of the shielding shell is fixedly connected to the flange surface.

[0014] In some embodiments, a conductive mesh is clamped between the bottom of the shielding shell and the flange surface.

[0015] In some embodiments, the outer diameter of the end of the splash-proof pipe away from the waveguide pipe is smaller than the outer diameter of the end of the splash-proof pipe close to the waveguide pipe, so that the outer wall of the splash-proof pipe is inclined.

[0016] In some embodiments, a sealing gasket is clamped between the connection of the splash-proof pipe and the waveguide pipe.

[0017] In some embodiments, the water return pipe includes a water collecting pipe and a water return pipe.

[0018] One end of the water collecting pipe is connected to one end of the water return pipe, the end of the water collecting pipe away from the water return pipe forms the water inlet end of the water return pipe, and the end of the water return pipe away from the water collecting pipe forms the water outlet end of the water return pipe.

[0019] In some embodiments, the inner diameter of the end of the water collecting pipe away from the water return pipe is larger than the inner diameter of the end of the water collecting pipe close to the water return pipe, so that the inner wall of the water collecting pipe is inclined.

[0020] The inner diameter of the end of the water collecting pipe away from the water return pipe is larger than the outer diameter of the bottom of the shielding shell.

[0021] In some embodiments, a drainage ring is arranged around the circumference of the shielding shell at the outer edge of the bottom surface of the shielding shell.

[0022] The end of the drainage ring away from the shielding shell is arranged towards the inner wall of the water collecting pipe.

[0023] In some embodiments, an air extraction pipe is communicatively arranged on the side wall of the end of the water return pipe close to the water collecting pipe, and an air extractor is connected to the end of the air extraction pipe away from the water return pipe.

[0024] Compared with the prior art, the water return device has at least the following advantages: the water outlet end of the drain pipe is inserted into the water inlet end of the shielding pipeline, under the action of the electromagnetic shielding structure of the shielding pipeline, the electromagnetic signal of the returned water can be shielded to avoid electromagnetic leakage and ensure the accuracy of the electromagnetic compatibility test of the whole machine. In addition, the opening end of the splash-proof cover arranged around the outer wall of the drain pipe is surrounded by the water inlet end of the shielding pipeline, which not only avoids affecting the torque measurement due to maintaining the non-contact connection between the drain pipe and the shielding pipeline, but also avoids water splashing at the gap therebetween. At the same time, the water inlet end of the water return pipeline is surrounded by the water outlet end of the shielding pipeline, so that the condensed water accumulated can directly flow into the water return pipeline from the gap between the water return pipeline and the shielding pipeline, so as to avoid the accumulation of condensed water and steam leakage, so as to make the test environment in the shielding chamber meet the requirements of relevant standards and specifications.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will be apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims thereof. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0027] Figure 1 A schematic view of the water return device in the embodiment of the present application is shown.

[0028] In the figure, 100 is a shielding pipeline, 110 is a waveguide, 120 is a splash-proof pipe, 130 is a shielding shell, 140 is a conductive web, 150 is an electromagnetic shielding structure, 200 is a drain pipe, 210 is a splash-proof cover, 300 is a water return pipeline, 310 is a water collecting pipe, 320 is a water return pipe, 330 is a suction pipe, 400 is a bolt connection assembly, and 500 is a sealing gasket. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0030] Referring to Figure 1 The embodiment of the present application provides a backwater device, which comprises a shielding pipeline 100, a drain pipeline 200 and a backwater pipeline 300. An electromagnetic shielding structure 150 is arranged in the shielding pipeline 100. The water outlet end of the drain pipeline 200 is inserted into the water inlet end of the shielding pipeline 100, and the outer wall of the water outlet end of the drain pipeline 200 is arranged in a gap with the inner wall of the water inlet end of the shielding pipeline 100. A splash-proof cover 210 is arranged on the outer wall of the drain pipeline 200 and surrounds the circumference of the drain pipeline 200, the open end of the splash-proof cover 210 is arranged around the water inlet end of the shielding pipeline 100, and the inner wall of the open end of the splash-proof cover 210 is arranged in a gap with the outer wall of the water inlet end of the shielding pipeline 100. The water inlet end of the backwater pipeline 300 is arranged around the water outlet end of the shielding pipeline 100, and the inner wall of the water inlet end of the backwater pipeline 300 is arranged in a gap with the outer wall of the water outlet end of the shielding pipeline 100.

[0031] Specifically, the water outlet end of the drain pipeline 200 is inserted into the water inlet end of the shielding pipeline 100, so that the drain pipeline 200 is in communication with the shielding pipeline 100, and the drain pipeline 200 can drain backwater into the shielding pipeline 100. The outer wall of the water outlet end of the drain pipeline 200 is arranged in a gap with the inner wall of the water inlet end of the shielding pipeline 100, so that the drain pipeline 200 and the shielding pipeline 100 still maintain a non-contact connection relationship, to prevent the shielding pipeline 100 from mechanically constraining the drain pipeline 200 and adversely affecting the torque measurement of the dynamometer. The splash-proof cover 210 is arranged on the outer wall of the drain pipeline 200 and surrounds the circumference of the drain pipeline 200, the open end of the splash-proof cover 210 is arranged towards the shielding pipeline 100, and the open end of the splash-proof cover 210 is arranged around the water inlet end of the shielding pipeline 100, so that the gap between the drain pipeline 200 and the shielding pipeline 100 can be covered by the splash-proof cover 210, to avoid water splashing in the gap. The inner wall of the open end of the splash-proof cover 210 is arranged in a gap with the outer wall of the water inlet end of the shielding pipeline 100, to prevent the shielding pipeline 100 from indirectly mechanically constraining the drain pipeline 200 through the splash-proof cover 210 and adversely affecting the torque measurement of the dynamometer. The gap between the drain pipeline 200 and the shielding pipeline 100 and the gap between the splash-proof cover 210 and the shielding pipeline 100 are arranged in a staggered manner, to further reduce the probability of water splashing and make the test environment in the shielding chamber meet the requirements of relevant standards and specifications.

[0032] Furthermore, the electromagnetic shielding structure 150 is arranged in the shielding pipeline 100, and the backwater drained by the drain pipeline 200 into the shielding pipeline 100 can be discharged from the output end of the shielding pipeline 100 after passing through the electromagnetic shielding structure 150. The electromagnetic shielding structure 150 can shield the electromagnetic signals of the backwater, to avoid electromagnetic leakage and ensure the accuracy of the electromagnetic compatibility test results of the whole machine.

[0033] Meanwhile, the water inlet end of the return water pipeline 300 is arranged around the water outlet end of the shielding pipeline 100, so that the return water passing through the shielding pipeline 100 can be directly discharged into the return water pipeline 300 and discharged to the return water pool through the return water pipeline 300. The inner wall of the water inlet end of the return water pipeline 300 is arranged in a gap with the outer wall of the water outlet end of the shielding pipeline 100, so that the condensed water accumulated on the outer wall of the shielding pipeline 100 due to the high temperature of the return water can directly flow into the return water pipeline 300 from the gap between the return water pipeline 300 and the shielding pipeline 100, so as to avoid the accumulation of condensed water and steam leakage, and further make the test environment in the shielding room meet the requirements of relevant standards and specifications.

[0034] It should be noted that the dynamometer is installed in the inside of the shielding room and connected with the engine, and the drain pipe 200 is arranged at the water discharge end of the dynamometer, and the water outlet end of the drain pipe 200 is arranged outside the shielding room.

[0035] In some embodiments of the present application, the shielding pipeline 100 comprises a waveguide tube 110 and a splash-proof pipe 120. The electromagnetic shielding structure 150 is arranged in the waveguide tube 110. One end of the splash-proof pipe 120 is connected with one end of the waveguide tube 110, and the end of the splash-proof pipe 120 away from the waveguide tube 110 forms the water inlet end of the shielding pipeline 100, and the end of the waveguide tube 110 away from the splash-proof pipe 120 forms the water outlet end of the shielding pipeline 100.

[0036] Specifically, one end of the splash-proof pipe 120 is connected with one end of the waveguide tube 110, the water outlet end of the drain pipe 200 is inserted into the end of the splash-proof pipe 120 away from the waveguide tube 110, the open end of the splash-proof cover 210 is arranged towards the splash-proof pipe 120, and the open end of the splash-proof cover 210 is arranged around the end of the splash-proof pipe 120 away from the waveguide tube 110, and the inner wall of the open end of the splash-proof cover 210 is arranged in a gap with the outer wall of the end of the splash-proof pipe 120 away from the waveguide tube 110, so that the end of the splash-proof pipe 120 away from the waveguide tube 110 forms the water inlet end of the shielding pipeline 100. The electromagnetic shielding structure 150 is arranged in the waveguide tube 110, and the return water discharged into the splash-proof pipe 120 by the drain pipe 200 can pass through the splash-proof pipe 120 to the waveguide tube 110, and contact the electromagnetic shielding structure 150 in the waveguide tube 110 and gradually pass through the electromagnetic shielding structure 150, so as to avoid electromagnetic leakage under the action of the electromagnetic shielding structure 150. The water inlet end of the return water pipeline 300 is arranged around the end of the waveguide tube 110 away from the splash-proof pipe 120, so that the return water passing through the waveguide tube 110 can be directly discharged into the return water pipeline 300, and the inner wall of the water inlet end of the return water pipeline 300 is arranged in a gap with the outer wall of the end of the waveguide tube 110 away from the splash-proof pipe 120, so that the end of the waveguide tube 110 away from the splash-proof pipe 120 forms the water outlet end of the shielding pipeline 100.

[0037] The electromagnetic shielding structure 150 is made of conductive material and extends along the axial direction of the waveguide tube 110, thereby isolating multiple channels for water flow in the interior of the waveguide tube 110, and the abutting portions of any two adjacent channels have the same shape. The return water can flow through the multiple channels of the electromagnetic shielding structure 150 to reach the other end of the waveguide tube 110 after reaching one end of the waveguide tube 110, which not only achieves the electromagnetic shielding effect, but also reduces the occupied space of the electromagnetic shielding structure 150 to avoid excessive size.

[0038] In some embodiments of the present application, a flange surface is fixedly arranged on the outer peripheral surface of the waveguide tube 110, and a shielding shell 130 is movably sleeved on the outer peripheral surface of the waveguide tube 110. The bottom of the shielding shell 130 is threadedly connected with the flange surface.

[0039] Specifically, the shielding shell 130 is movably sleeved on the outer peripheral surface of the waveguide tube 110, so that the end of the waveguide tube 110 close to the return water pipeline 300 is movably penetrated by the side surface of the shielding shell 130 close to the return water pipeline 300. The outer peripheral surface of the waveguide tube 110 is also surrounded by a flange surface. By moving the waveguide tube 110, the relative position between the waveguide tube 110 and the shielding shell 130 can be changed until the flange surface and the side surface of the shielding shell 130 close to the return water pipeline 300 abut each other. Bolts can be threadedly penetrated in the flange surface and the side surface of the shielding shell 130 close to the return water pipeline 300 in sequence, and the waveguide tube 110 and the shielding shell 130 are fixedly arranged by the bolts between the flange surface and the shielding shell 130. Not only is it convenient to install and fix, but also the shielding shell 130 can further prevent electromagnetic leakage.

[0040] It should be noted that the shielding shell 130 constitutes part of the shielding layer of the shielding chamber, and provides installation space for the shielding pipeline 100 inside the shielding shell 130. The top end of the shielding shell 130 is fixedly connected with the shielding layer through a flange, so that the top end of the shielding shell 130 is above the interior of the shielding chamber, and the bottom of the shielding shell 130 is below the exterior of the shielding chamber.

[0041] In some embodiments of the present application, the conductive mesh rib 140 is clamped between the bottom of the shielding shell 130 and the flange surface.

[0042] Specifically, the conductive mesh 140 is sleeved on the outer circumferential surface of the waveguide tube 110, and the conductive mesh 140 is located on the side of the flange surface close to the side surface of the shielding shell 130 close to the return water pipeline 300, so that the flange surface can abut against the side surface of the shielding shell 130 close to the return water pipeline 300 through the conductive mesh 140, that is, when the flange surface and the shielding shell 130 are bolted, the conductive mesh 140 can be clamped between the flange surface and the side surface of the shielding shell 130 close to the return water pipeline 300, and the electromagnetic gap between the flange surface and the side surface of the shielding shell 130 close to the return water pipeline 300 can be sealed through the conductive mesh 140, further avoiding leakage of electromagnetic signals through the gap between the contact surfaces of the flange surface and the side surface of the shielding shell 130 close to the return water pipeline 300.

[0043] In some specific embodiments of the present application, the outer diameter of the splash-proof pipe 120 away from the one end of the waveguide tube 110 is smaller than the outer diameter of the one end of the waveguide tube 110 close to the waveguide tube 110, so that the outer wall of the splash-proof pipe 120 is inclinedly arranged.

[0044] Specifically, the outer diameter of the splash-proof pipe 120 away from the one end of the waveguide tube 110 is smaller than the outer diameter of the one end of the waveguide tube 110 close to the waveguide tube 110, so that a reverse funnel structure with narrow top and wide bottom is formed from the one end of the splash-proof pipe 120 away from the waveguide tube 110 to the one end of the waveguide tube 110 close to the waveguide tube 110, and the outer wall of the splash-proof pipe 120 is inclinedly arranged, so as to facilitate the opening end of the splash-proof cover 210 to be arranged around the one end of the splash-proof pipe 120 away from the waveguide tube 110. Moreover, the water splashes between the drain pipe 200 and the splash-proof pipe 120 can be limited within the splash-proof cover 210 under the action of the splash-proof cover 210, and the water splashes are driven to fall on the outer wall of the splash-proof pipe 120, so that the water splashes are gradually guided to flow into the shielding shell 130 through the splash-proof pipe 120 with the inclined outer wall, further avoiding the water splashes from splashing and contacting the shielding chamber.

[0045] In some specific embodiments of the present application, the sealing gasket 500 is clamped between the connection between the splash-proof pipe 120 and the waveguide tube 110.

[0046] Specifically, the splash-proof pipe 120 and the waveguide tube 110 are fixedly connected through the bolt connection assembly 400 arranged on the outer walls of the splash-proof pipe 120 and the waveguide tube 110 respectively. Moreover, the sealing gasket 500 is arranged between the contact surfaces of the end portions of the splash-proof pipe 120 and the waveguide tube 110, so that the sealing gasket 500 can be clamped between the contact surfaces of the end portions of the splash-proof pipe 120 and the waveguide tube 110 when the splash-proof pipe 120 and the waveguide tube 110 are fixedly connected through the bolt connection assembly 400, thereby ensuring the sealing between the splash-proof pipe 120 and the waveguide tube 110, and avoiding leakage of the return water.

[0047] In some embodiments of the present application, the backwater pipeline 300 comprises a water collecting pipe 310 and a backwater pipe 320. One end of the water collecting pipe 310 is connected to one end of the backwater pipe 320, and the end of the water collecting pipe 310 away from the backwater pipe 320 forms the water inlet end of the backwater pipeline 300, and the end of the backwater pipe 320 away from the water collecting pipe 310 forms the water outlet end of the backwater pipeline 300.

[0048] Specifically, one end of the water collecting pipe 310 is connected to one end of the backwater pipe 320, and the end of the water collecting pipe 310 away from the backwater pipe 320 is arranged around the end of the waveguide pipe 110 away from the splash-proof pipe 120, so that the backwater passing through the waveguide pipe 110 can be directly discharged into the water collecting pipe 310, wherein the inner wall of the end of the water collecting pipe 310 away from the backwater pipe 320 is arranged in a gap with the outer wall of the end of the waveguide pipe 110 away from the splash-proof pipe 120, so that the end of the water collecting pipe 310 away from the backwater pipe 320 forms the water inlet end of the backwater pipeline 300. The end of the backwater pipe 320 away from the water collecting pipe 310 is connected to the backwater pool, so that the backwater and condensed water falling into the water collecting pipe 310 can flow into the backwater pipe 320 along the water collecting pipe 310, and be discharged into the backwater pool through the backwater pipe 320, so that the end of the backwater pipe 320 away from the water collecting pipe 310 forms the water outlet end of the backwater pipeline 300.

[0049] In some embodiments of the present application, the inner diameter of the end of the water collecting pipe 310 away from the backwater pipe 320 is larger than the inner diameter of the end of the water collecting pipe 310 close to the backwater pipe 320, so that the inner wall of the water collecting pipe 310 is arranged obliquely. And the inner diameter of the end of the water collecting pipe 310 away from the backwater pipe 320 is larger than the outer diameter of the bottom of the shielding shell 130.

[0050] Specifically, the inner diameter of the end of the water collecting pipe 310 away from the backwater pipe 320 is larger than the inner diameter of the end of the water collecting pipe 310 close to the backwater pipe 320, so that a funnel structure with wide top and narrow bottom is formed from the end of the water collecting pipe 310 away from the backwater pipe 320 to the end of the water collecting pipe 310 close to the backwater pipe 320, and the inner wall of the water collecting pipe 310 is arranged obliquely, so that the backwater and condensed water falling into the water collecting pipe 310 can flow smoothly along the obliquely arranged inner wall of the water collecting pipe 310 after contacting the inner wall of the water collecting pipe 310. And the inner diameter of the end of the water collecting pipe 310 away from the backwater pipe 320 is larger than the outer diameter of the bottom of the shielding shell 130 close to the water collecting pipe 310, so that the condensed water accumulated on the bottom surface of the shielding shell 130 due to the high temperature of the backwater can directly fall into the water collecting pipe 310, and the condensed water accumulated on the outer side wall of the shielding shell 130 due to the high temperature of the backwater can also continuously slide down along the outer side wall of the shielding shell 130 until reaching the bottom surface position of the shielding shell 130 and then falling into the water collecting pipe 310. The collection efficiency of the condensed water is improved, and the shielding chamber is further prevented from being polluted.

[0051] In some embodiments of the present application, a drainage ring is arranged around the circumference of the bottom outer edge of the shielding shell 130. The end of the drainage ring away from the shielding shell 130 is arranged towards the inner wall of the water collecting pipe 310.

[0052] Specifically, a drainage ring is arranged around the circumference of the outer edge of the bottom of the shielding shell 130, and the end of the drainage ring away from the shielding shell 130 is arranged obliquely towards the inner wall of the water collecting pipe 310. When the condensed water accumulated on the outer side wall of the shielding shell 130 slides down along the outer side wall of the shielding shell 130 until reaching the bottom of the shielding shell 130, and the condensed water directly accumulated on the bottom of the shielding shell 130, all the condensed water will first contact the drainage ring and then continue to fall through the drainage ring. Since the end of the drainage ring away from the shielding shell 130 is arranged towards the inner wall of the water collecting pipe 310, the condensed water falling along the drainage ring can directly fall onto the inner wall of the water collecting pipe 310, so that the condensed water falling into the water collecting pipe 310 can smoothly flow into the water return pipe 320 along the obliquely arranged inner wall of the water collecting pipe 310 after contacting the inner wall of the water collecting pipe 310, thereby improving the collection efficiency of the condensed water and further avoiding pollution of the shielding chamber.

[0053] In some embodiments of the present application, an air extraction pipe 330 is arranged in communication on the side wall of the end of the water return pipe 320 close to the water collecting pipe 310, and an air extractor is connected to the end of the air extraction pipe 330 away from the water return pipe 320.

[0054] Specifically, a communication hole is formed on the side wall of the end of the water return pipe 320 close to the water collecting pipe 310, and one end of the air extraction pipe 330 is connected to the side wall of the end of the water return pipe 320 close to the water collecting pipe 310 through the communication hole, so that the air extraction pipe 330 can be in communication with the water collecting pipe 310 through the water return pipe 320. An air extractor is connected to the end of the air extraction pipe 330 away from the water return pipe 320. When the air extractor is turned on, the air and steam in the water return pipe 320, the water collecting pipe 310, and the vicinity of the port of the end of the water collecting pipe 310 away from the water return pipe 320 can be extracted into the air extraction pipe 330 under the action of the air extractor, and then discharged into the atmosphere through the air extractor after reaching the air extractor along the air extraction pipe 330, thereby further achieving the purpose of reducing steam leakage into the shielding chamber.

[0055] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A backwater device, characterized in that The utility model relates to a kind of electromagnetic shielding structure and water drainage pipe for engine test, including: Shielding pipeline (100), electromagnetic shielding structure (150) is arranged in it; Drain pipe (200), dynamometer is installed in the inside of shielding chamber and is connected with engine, the drain pipe (200) is arranged in the drainage end of the dynamometer, the water outlet end of the drain pipe (200) is inserted to the outside of shielding chamber; The water outlet end of the drain pipe (200) is inserted in the water inlet end of the shielding pipeline (100), and the outer wall of the water outlet end of the drain pipe (200) is gap arranged with the inner wall of the water inlet end of the shielding pipeline (100); Splash cover (210) is arranged on the outer wall of the drain pipe (200) around the circumference of the drain pipe (200), the opening end of the splash cover (210) is surrounded in the water inlet end of the shielding pipeline (100), and the inner wall of the opening end of the splash cover (210) is gap arranged with the outer wall of the water inlet end of the shielding pipeline (100); Water return pipeline (300), the water inlet end of which is surrounded in the water outlet end of the shielding pipeline (100), and the inner wall of the water inlet end of the water return pipeline (300) is gap arranged with the outer wall of the water outlet end of the shielding pipeline (100); The shielding pipeline (100) includes: Waveguide tube (110), the electromagnetic shielding structure (150) is arranged in the waveguide tube (110); Splash pipe (120), one end is connected with one end of the waveguide tube (110), the splash pipe (120) is formed in the water inlet end of the shielding pipeline (100) away from one end of the waveguide tube (110), and the water outlet end of the shielding pipeline (100) is formed in one end of the waveguide tube (110) away from the splash pipe (120); Flange surface is fixedly arranged on the outer circumferential surface of the waveguide tube (110), and shielding shell (130) is movably sleeved on the outer circumferential surface of the waveguide tube (110); The bottom of the shielding shell (130) is fixedly connected with the flange surface; Conductive mesh rib (140) is clamped between the bottom of the shielding shell (130) and the flange surface.

2. A water return device according to claim 1, characterised in that The outer diameter dimension of one end of the splash pipe (120) away from the waveguide tube (110) is less than the outer diameter dimension of one end of the splash pipe (120) close to the waveguide tube (110), so that the outer wall of the splash pipe (120) is obliquely arranged.

3. The water return device of claim 1, wherein Sealing pad (500) is clamped between the connection of the splash pipe (120) and the waveguide tube (110).

4. The water return device of claim 1, wherein Water return pipeline (300) includes: water collecting pipe (310) and water return pipe (320); One end of the water collecting pipe (310) is connected with one end of the water return pipe (320), the water inlet end of the water return pipeline (300) is formed in one end of the water collecting pipe (310) away from the water return pipe (320), and the water outlet end of the water return pipeline (300) is formed in one end of the water return pipe (320) away from the water collecting pipe (310).

5. A water return device according to claim 4, characterised in that The inner diameter of the water collecting pipe (310) far from the one end of the return pipe (320) is larger than the inner diameter of the water collecting pipe (310) close to the one end of the return pipe (320), so that the inner wall of the water collecting pipe (310) is inclinedly arranged; And the inner diameter of the water collecting pipe (310) far from the one end of the return pipe (320) is larger than the outer diameter of the bottom of the shielding shell (130).

6. A water return device according to claim 5, characterised in that A drainage ring is arranged around the periphery of the shielding shell (130) at the outer edge of the bottom surface of the shielding shell (130); The one end of the drainage ring far from the shielding shell (130) is arranged towards the inner wall of the water collecting pipe (310).

7. The water return device of claim 4, wherein A suction pipe (330) is arranged in communication on the side wall of the one end of the return pipe (320) close to the water collecting pipe (310), and the one end of the suction pipe (330) far from the return pipe (320) is connected to be provided with a suction machine.

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