Jet device with double fluid channels

Abstract

The invention discloses a double-fluid-channel jet device. The double-fluid-channel jet device comprises a jet nozzle, a first valve body and a second valve body, a first jet channel and a second jet channel are arranged in the jet nozzle, the jet nozzle is arranged on the first valve body, the first valve body is provided with a first inlet end and a first outlet end, a first valve element is arranged in the first valve body, and a second valve element is arranged in the second valve body. The first inlet end is communicated with the first outlet end or the first inlet end is communicated with the first spraying channel through movement of the first valve element, the first valve body is arranged in the second valve body, the jet flow spraying head penetrates through the peripheral wall of the second valve body, and the second valve body is provided with a second inlet end. An annular auxiliary fluid medium channel is defined between the second valve body and the first valve body, and the second inlet end communicates with the second injection channel through the auxiliary fluid medium channel. Through the synergistic effect of the two fluids, expansion of original fractures and initiation of new fractures in a coal body can be effectively promoted, and the flow conductivity of a coal seam fracture network is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety technology, and in particular to a dual-fluid channel jet device. Background Technology

[0002] Water jet impingement permeability enhancement technology has long attracted attention due to its advantages such as simple process and economic practicality, demonstrating significant effects in the field of permeability enhancement for low-permeability coal seams. However, this technology still faces many technical bottlenecks in engineering applications. For example, traditional pure water jetting relies on high working pressure and consumes a large amount of water, and is prone to causing a "water lock" effect, which not only inhibits gas desorption but also leads to water accumulation and coal slag buildup in parallel and downward boreholes, seriously affecting gas extraction efficiency and hindering the widespread application of this technology. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a dual-fluid channel jet device, namely a dual-fluid synergistic jet permeation enhancement device of high-pressure water and auxiliary fluid medium.

[0005] The dual-fluid channel jet device of this invention includes:

[0006] A jet nozzle, wherein the jet nozzle has a first jet channel and a second jet channel, the first jet channel and the second jet channel extending along the axial direction of the jet nozzle;

[0007] A first valve body, wherein the jet nozzle is disposed on the first valve body and extends radially along the first valve body, the first valve body has a first inlet end and a first outlet end disposed opposite to each other along its axial direction, a first valve core is disposed inside the first valve body, the first valve core is movable between a first position and a second position along the axial direction of the first valve body, the first valve core is in the first position and the first inlet end is connected to the first outlet end, the first valve core is in the second position and the first inlet end is connected to the first injection channel;

[0008] The second valve body is at least partially disposed within the first valve body, and the second valve body is coaxially arranged with the first valve body. The jet nozzle penetrates the peripheral wall of the second valve body radially. The second valve body has a second inlet end in its axial direction. An annular auxiliary fluid medium channel is defined between the second valve body and the first valve body. The second inlet end communicates with the second jet channel through the auxiliary fluid medium channel.

[0009] The dual-fluid channel jet device of this invention, through the synergistic effect of two fluids, can effectively promote the expansion of primary fractures and the initiation of new fractures within the coal seam, significantly enhancing the conductivity of the coal seam fracture network. Simultaneously, this device can significantly reduce the "water-locking" effect generated during conventional hydraulic permeability enhancement processes, thereby greatly improving the overall permeability of the coal seam and providing a new technical approach for efficient gas extraction from extra-thick coal seams.

[0010] In some embodiments, the first injection channel is located at the center of the jet nozzle, the first injection channel extends from one end of the jet nozzle near the first valve body to one end away from the first valve body, the cross-sectional area of ​​the first injection channel gradually decreases from one end of the jet nozzle near the first valve body to one end away from the first valve body, the second injection channel is spaced around the first injection channel, and the peripheral wall of the jet nozzle is provided with a plurality of radial guide holes, the auxiliary fluid medium channel is connected to the second injection channel through the plurality of radial guide holes.

[0011] In some embodiments, the first inlet end is provided with a partition cylinder located in the second valve body. The partition cylinder extends along the axial direction of the first valve body toward the second inlet end, and the cross-sectional area of ​​the inner cavity of the partition cylinder gradually increases along the extension direction of the partition cylinder. An annular drainage channel is defined between the second valve body and the partition cylinder, and the second inlet end is connected to the auxiliary fluid medium channel through the drainage channel.

[0012] In some embodiments, the first valve body includes a first segment, a second segment, and a third segment connected in sequence. The first inlet end is located in the first segment, and the first outlet end is located in the third segment. The outer peripheral walls of the first segment and the third segment are respectively tightly fitted to the inner peripheral wall of the second valve body. A plug is provided in the third segment, and a first spring is provided in the second segment. One end of the first spring abuts against the first valve core, and the other end of the first spring abuts against the plug.

[0013] In some embodiments, a flow guiding channel is defined between the second valve body and the second segment. The first segment is provided with an assembly hole and a first flow guiding hole. A portion of the jet nozzle is disposed within the assembly hole. The first valve core is provided with a second flow guiding hole, and the third segment is provided with a third flow guiding hole. The first flow guiding hole and the third flow guiding hole are respectively connected to the flow guiding channel. When the first valve core is in the first position, the second flow guiding hole, the first flow guiding hole, the flow guiding channel, and the third flow guiding hole are sequentially connected to each other so that the first inlet end is connected to the first outlet end. When the first valve core is in the second position, the first valve core opens the assembly hole so that the first inlet end is connected to the first jet channel.

[0014] In some embodiments, the dual-fluid channel jet device further includes a one-way valve body, the second valve body having a second outlet end opposite to the second inlet end in its axial direction, the one-way valve body being disposed at the second outlet end, the one-way valve body being coaxially arranged with the second valve body, the one-way valve body having a third inlet end and a third outlet end disposed opposite to each other in its axial direction, the first outlet end communicating with the third inlet end, the one-way valve body having a second valve core disposed therein, the second valve core being movable between a third position and a fourth position along the axial direction of the one-way valve body, the second valve core being in the third position where the third inlet end is connected to the third outlet end, the second valve core being in the fourth position where the passage between the third inlet end and the third outlet end is disconnected.

[0015] In some embodiments, the dual-fluid channel jet device has a first state and a second state.

[0016] The dual-fluid channel jet device is in the first state, the first valve core is in the first position, and the second valve core is in the third position;

[0017] The dual-fluid channel jet device is in the second state, the first valve core is in the second position, and the second valve core is in the fourth position.

[0018] In some embodiments, the third inlet end is provided with an annular retaining ring, the third outlet end is provided with a filter plate, a second spring is provided between the second valve core and the filter plate, the second valve core is provided with a fourth guide hole, the second valve core is in the third position, the fourth guide hole is connected to the central through hole of the retaining ring so that the third inlet end and the third outlet end are connected, the second valve core is in the fourth position, the second valve core abuts against the retaining ring, the fourth guide hole is disconnected from the central through hole of the retaining ring so that the passage between the third inlet end and the third outlet end is disconnected.

[0019] In some embodiments, the jet nozzles are multiple and are arranged circumferentially around the first valve body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a dual-fluid channel jet device according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the low-pressure water drilling operation of the dual-fluid channel jet device according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the high-pressure water jet cutting operation of the dual-fluid channel jet device according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of a jet nozzle according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the first valve body according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the first valve core according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the second valve body according to an embodiment of the present invention.

[0027] Figure 8 This is a schematic diagram of the second valve core according to an embodiment of the present invention.

[0028] Figure label:

[0029] 1-Jet nozzle, 101-First jet channel, 102-Second jet channel, 103-Radial guide hole,

[0030] 2-First valve body, 21-First inlet end, 22-First outlet end, 23-First section, 24-Second section, 25-Third section, 26-Plug, 27-First spring, 201-Assembly hole, 202-First guide hole, 203-Third guide hole

[0031] 3-First valve core, 301-Second guide hole,

[0032] 4-Second valve body, 41-Second inlet end, 42-Second outlet end, 401-Auxiliary fluid medium channel, 402-Drainage channel, 403-Guide channel,

[0033] 5-Separator cylinder

[0034] 6-One-way valve body, 61-Third inlet end, 62-Third outlet end, 63-Retaining ring, 64-Filter plate, 65-Second spring, 7-Second valve core, 701-Fourth guide hole. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The dual-fluid channel jet device of the present invention is described below with reference to the accompanying drawings.

[0037] like Figures 1 to 8 As shown, the dual-fluid channel jet device of this invention includes a jet nozzle 1, a first valve body 2, and a second valve body 4.

[0038] The jet nozzle 1 is provided with a first jet channel 101 and a second jet channel 102, which extend along the axial direction of the jet nozzle 1. The first jet channel is used to jet high-pressure water, and the second jet channel 102 is used to jet high-pressure gas (compressed air / nitrogen) or special material solution (acidifying material, degrading material).

[0039] A jet nozzle 1 is disposed on a first valve body 2, and the jet nozzle 1 extends radially along the first valve body 2. The first valve body 2 has a first inlet end 21 and a first outlet end 22 disposed opposite to each other along its axial direction. A first valve core 3 is disposed inside the first valve body 2, and the first valve core 3 is movable between a first position and a second position along the axial direction of the first valve body 2.

[0040] At least a portion of the first valve body 2 is disposed within the second valve body 4. The second valve body 4 is coaxially arranged with the first valve body 2. The jet nozzle 1 penetrates the peripheral wall of the second valve body 4 radially. The second valve body 4 has a second inlet end 41 in its axial direction. An annular auxiliary fluid medium channel 401 is defined between the second valve body 4 and the first valve body 2. The second inlet end 41 is connected to the second jet channel 102 through the auxiliary fluid medium channel 401.

[0041] like Figure 2 As shown, when the first valve core 3 is in the first position, the first inlet end 21 and the first outlet end 22 are connected, and low-pressure water flows from the first inlet end 21 to the first outlet end 22, and the dual-fluid channel jet device performs low-pressure water drilling operation.

[0042] like Figure 3 As shown, when the first valve core 3 is in the second position, the first inlet end 21 is connected to the first injection channel 101, and high-pressure water flows from the first inlet end 21 to the first injection channel 101. The dual-fluid channel jet device performs high-pressure water jet cutting operation. At the same time, the auxiliary medium (high-pressure gas or special material solution) flows from the second inlet end 41 to the second injection channel 102, respectively realizing efficient slag discharge and hole cleaning operation or special material injection operation.

[0043] In other words, the dual-fluid channel jet device of this invention comprises two completely independent fluid channels. The first fluid channel uses water as the working medium and primarily performs low-pressure water drilling and high-pressure water jet slit cutting functions. The second fluid channel can optionally be configured with high-pressure gas and a special material solution to achieve efficient slag removal and hole cleaning, and special material injection operations, respectively. This dual-channel collaborative design concept ensures independent control of each fluid medium while achieving efficient permeability enhancement of low-permeability coal seam gas through the synergistic effect of high-pressure water and auxiliary media.

[0044] Therefore, the dual-fluid channel jet device of this invention, through the synergistic effect of two fluids, can effectively promote the expansion of primary fractures and the initiation of new fractures within the coal seam, significantly enhancing the conductivity of the coal seam fracture network. Simultaneously, this device can significantly reduce the "water-locking" effect generated during conventional hydraulic permeability enhancement processes, thereby greatly improving the overall permeability of the coal seam and providing a new technical approach for efficient gas extraction from extra-thick coal seams.

[0045] In some embodiments, such as Figures 1 to 4 As shown, the first injection channel 101 is located at the center of the jet nozzle 1, extending from one end of the jet nozzle 1 near the first valve body 2 to the other end away from the first valve body 2. The cross-sectional area of ​​the first injection channel 101 gradually decreases from the end of the jet nozzle 1 near the first valve body 2 to the end away from the first valve body 2. High-pressure water passes through the central first injection channel 101, and the fluid jet velocity is increased by the tapering structure.

[0046] The second injection channel 102 surrounds the first injection channel 101 at intervals. Multiple radial guide holes 103 are provided on the peripheral wall of the jet nozzle 1. The auxiliary fluid medium channel 401 communicates with the second injection channel 102 through the multiple radial guide holes 103. The auxiliary medium enters the annular second injection channel 102 uniformly through the multiple radial guide holes 103.

[0047] Therefore, by setting a central first jet channel 101 and an annular second jet channel 102, the jet nozzle 1, with the first jet channel 101 and the second jet channel 102 arranged in a precise concentric manner, not only enhances the ejection capability of high-pressure water, but also improves the mixing efficiency of high-pressure water and auxiliary medium on the outside.

[0048] In some embodiments, such as Figures 1 to 3 As shown, the first inlet end 21 is provided with a partition cylinder 5 located inside the second valve body 4. The partition cylinder 5 extends along the axial direction of the first valve body 2 towards the second inlet end 41, and the cross-sectional area of ​​the inner cavity of the partition cylinder 5 gradually increases along the extending direction of the partition cylinder 5. An annular flow channel 402 is defined between the second valve body 4 and the partition cylinder 5, and the second inlet end 41 is connected to the auxiliary fluid medium channel 401 through the flow channel 402.

[0049] It is understandable that the separator 5 is connected to the first valve body 2 and is nested inside the second valve body 4. The function of the separator 5 is to separate the two fluids flowing in from the second inlet end 41, effectively preventing the two fluids from mixing, minimizing energy loss, and enabling the device to achieve efficient energy transfer of two fluids.

[0050] For example, water flows into the separator 5 through the second inlet end 41 and then into the first valve body 2; the auxiliary medium flows into the diversion channel 402 through the second inlet end 41 and then into the auxiliary fluid medium channel 401, and the diversion channel 402 can also make the auxiliary medium flow into the auxiliary fluid medium channel 401 evenly.

[0051] In some embodiments, such as Figures 1 to 6 As shown, the first valve body 2 includes a first section 23, a second section 24, and a third section 25 connected in sequence. The first inlet end 21 is located in the first section 23, and the first outlet end 22 is located in the third section 25.

[0052] The outer peripheral walls of the first segment 23 and the third segment 25 are respectively tightly fitted to the inner peripheral wall of the second valve body 4 so that the first valve body 2 is stably installed inside the second valve body 4.

[0053] The third section 25 is equipped with a plug 26, and the second section 24 is equipped with a first spring 27. One end of the first spring 27 abuts against the first valve core 3, and the other end of the first spring 27 abuts against the plug 26. The first spring 27 is always in a compressed state so that, under the condition of no external force, the first spring 27 presses the end of the first valve core 3 and the end of the separator cylinder 5 together.

[0054] The second valve body 4 and the second section 24 define a flow channel 403. The first section 23 is provided with an assembly hole 201 and a first flow channel 202. Part of the jet nozzle 1 is located in the assembly hole 201. The first valve core 3 is provided with a second flow channel 301. The third section 25 is provided with a third flow channel 203. The first flow channel 202 and the third flow channel 203 are respectively connected to the flow channel 403.

[0055] The first valve core 3 and the first spring 27 are integrated within the first valve body 2 to control the switching between the high-pressure and low-pressure passages of the first fluid (water). The working principle is as follows: the first fluid drives the mechanical actuator composed of the first valve core 3 and the first spring 27, causing the first valve core 3 to move axially along the slide of the first valve body 2, thereby dynamically changing the connectivity of the fluid passage and achieving reliable switching between the high-pressure and low-pressure sides.

[0056] like Figure 2 As shown, when low-pressure water is introduced into the device, the first valve core 3 is in the first position, and the second guide hole 301, the first guide hole 202, the guide channel 403, and the third guide hole 203 are sequentially connected to make the first inlet end 21 connected to the first outlet end 22. The low-pressure water flows sequentially through the inner cavity of the separator cylinder 5, the inner cavity of the first valve core 3, the second guide hole 301, the first guide hole 202, the guide channel 403, and the third guide hole 203 to the first outlet end 22.

[0057] like Figure 3 As shown, when high-pressure water is introduced into the device, the high-pressure water pushes the first valve core 3 to move and compresses the first spring 27. The first valve core 3 moves from the first position to the second position, opening the assembly hole 201 so that the first inlet end 21 is connected to the first injection channel 101. The high-pressure water flows sequentially through the inner cavity of the separator cylinder 5, the inner cavity of the first valve core 3, the assembly hole 201, and the first injection channel 101 to the outside.

[0058] In some embodiments, such as Figures 1 to 8 As shown, the dual-fluid channel jet device also includes a one-way valve body 6. The second valve body 4 has a second outlet end 42 that is axially opposite to the second inlet end 41. The one-way valve body 6 is disposed at the second outlet end 42 and is coaxially arranged with the second valve body 4. The one-way valve body 6 has a third inlet end 61 and a third outlet end 62 that are axially opposite to each other. The first outlet end 22 is connected to the third inlet end 61. A second valve core 7 is disposed inside the one-way valve body 6. The second valve core 7 is movable between a third position and a fourth position along the axial direction of the one-way valve body 6. When the second valve core 7 is in the third position, the third inlet end 61 and the third outlet end 62 are connected. When the second valve core 7 is in the fourth position, the passage between the third inlet end 61 and the third outlet end 62 is disconnected.

[0059] Understandably, when the dual-fluid channel jet device performs low-pressure water drilling operations, the low-pressure water flows through the first valve body 2 to the one-way valve body 6, and then through the one-way valve body 6 to the outside, which can effectively block the reverse seepage of coal slag water and ensure the working reliability of the dual-fluid channel jet device.

[0060] For example, the dual-fluid channel jet device has a first state and a second state. The first state corresponds to the low-pressure water drilling operation of the dual-fluid channel jet device, and the second state corresponds to the high-pressure water jet cutting operation of the dual-fluid channel jet device.

[0061] like Figure 2 As shown, in the first state, the first valve core 3 is in the first position and the second valve core 7 is in the third position, so that low-pressure water passes through the first valve body 2 and the one-way valve body 6 in sequence.

[0062] like Figure 3 As shown, in the second state, the first valve core 3 is in the second position and the second valve core 7 is in the fourth position, and the high-pressure water flows to the first spray channel 101 of the jet nozzle 1.

[0063] Optionally, the third inlet end 61 is provided with an annular retaining ring 63, and the third outlet end 62 is provided with a filter plate 64. A second spring 65 is provided between the second valve core 7 and the filter plate 64, and the second spring 65 is always in a compressed state. The second valve core 7 is provided with a fourth guide hole 701.

[0064] like Figure 2 As shown, when the second valve core 7 is in the third position, the fourth guide hole 701 is connected to the central through hole of the retaining ring 63, so that the third inlet end 61 and the third outlet end 62 are connected. The low-pressure water flowing out from the first outlet end 22 flows into the one-way valve body 6 through the third inlet end 61, and then flows through the central through hole of the retaining ring 63, the fourth guide hole 701 and the inner cavity of the second valve core 7 to the third outlet end 62 in sequence, and finally flows to the outside through the filter plate 64.

[0065] like Figure 3 As shown, due to the high pressure water causing the first valve core 3 to move to the second position, no water flows to the one-way valve body 6, resulting in the second valve core 7 not being subjected to external force. Under the action of the second spring 65, the second valve core 7 is pressed onto the retaining ring 63 (the second valve core 7 is in the fourth position), so that the second valve core 7 blocks the central through hole of the retaining ring 63, thereby disconnecting the passage between the third inlet end 61 and the third outlet end 62.

[0066] The one-way valve body 6, the second spring 65, the filter plate 64, and the retaining ring 63 are the core components for preventing clogging in the dual-fluid channel jet device. The second spring 65, filter plate 64, and retaining ring 63 are precisely assembled and integrated within the one-way valve body 6, together forming the function of a fluid one-way valve. This structure employs a triple protection mechanism: spring pre-compression, filter plate 64 intercepting coal slag water, and retaining ring 63 mechanically limiting the flow. This effectively blocks the reverse seepage of coal slag water, ensuring the reliable operation of the dual-fluid channel jet device.

[0067] In some embodiments, such as Figures 1 to 3 As shown, there are multiple jet nozzles 1, which are arranged circumferentially around the first valve body 2 to improve the effectiveness and uniformity of the device operation.

[0068] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dual-fluid channel jet device, characterized in that, include: A jet nozzle, wherein the jet nozzle has a first jet channel and a second jet channel, the first jet channel and the second jet channel extending along the axial direction of the jet nozzle; A first valve body, wherein the jet nozzle is disposed on the first valve body and extends radially along the first valve body, the first valve body has a first inlet end and a first outlet end disposed opposite to each other along its axial direction, a first valve core is disposed inside the first valve body, the first valve core is movable between a first position and a second position along the axial direction of the first valve body, the first valve core is in the first position and the first inlet end is connected to the first outlet end, the first valve core is in the second position and the first inlet end is connected to the first injection channel; The second valve body is at least partially disposed within the first valve body, and the second valve body is coaxially arranged with the first valve body. The jet nozzle penetrates the peripheral wall of the second valve body radially. The second valve body has a second inlet end in its axial direction. An annular auxiliary fluid medium channel is defined between the second valve body and the first valve body. The second inlet end communicates with the second jet channel through the auxiliary fluid medium channel.

2. The dual-fluid channel jet device according to claim 1, characterized in that, The first injection channel is located at the center of the jet nozzle. The first injection channel extends from one end of the jet nozzle near the first valve body to the other end away from the first valve body. The cross-sectional area of ​​the first injection channel gradually decreases from the end of the jet nozzle near the first valve body to the end away from the first valve body. The second injection channel surrounds the first injection channel at intervals. The peripheral wall of the jet nozzle is provided with a plurality of radial guide holes. The auxiliary fluid medium channel is connected to the second injection channel through the plurality of radial guide holes.

3. The dual-fluid channel jet device according to claim 1, characterized in that, The first inlet end is provided with a partition cylinder located in the second valve body. The partition cylinder extends along the axial direction of the first valve body toward the second inlet end, and the cross-sectional area of ​​the inner cavity of the partition cylinder gradually increases along the extension direction of the partition cylinder. An annular flow channel is defined between the second valve body and the partition cylinder, and the second inlet end is connected to the auxiliary fluid medium channel through the flow channel.

4. The dual-fluid channel jet device according to claim 1, characterized in that, The first valve body includes a first section, a second section, and a third section connected in sequence. The first inlet end is located in the first section, and the first outlet end is located in the third section. The outer peripheral walls of the first section and the third section are respectively tightly fitted to the inner peripheral wall of the second valve body. A plug is provided in the third section, and a first spring is provided in the second section. One end of the first spring abuts against the first valve core, and the other end of the first spring abuts against the plug.

5. The dual-fluid channel jet device according to claim 4, characterized in that, A flow guiding channel is defined between the second valve body and the second section. The first section is provided with an assembly hole and a first flow guiding hole. A portion of the jet nozzle is disposed in the assembly hole. The first valve core is provided with a second flow guiding hole. The third section is provided with a third flow guiding hole. The first flow guiding hole and the third flow guiding hole are respectively connected to the flow guiding channel. The first valve core is in the first position. The second flow guiding hole, the first flow guiding hole, the flow guiding channel, and the third flow guiding hole are sequentially connected to each other so that the first inlet end is connected to the first outlet end. The first valve core is in the second position. The first valve core opens the assembly hole so that the first inlet end is connected to the first jet channel.

6. The dual-fluid channel jet device according to claim 1, characterized in that, It also includes a one-way valve body, the second valve body having a second outlet end opposite to the second inlet end in its axial direction, the one-way valve body being disposed at the second outlet end, the one-way valve body being coaxially arranged with the second valve body, the one-way valve body having a third inlet end and a third outlet end disposed opposite to each other in its axial direction, the first outlet end communicating with the third inlet end, the one-way valve body having a second valve core disposed therein, the second valve core being movable between a third position and a fourth position along the axial direction of the one-way valve body, the second valve core being in the third position with the third inlet end communicating with the third outlet end, the second valve core being in the fourth position with the passage between the third inlet end and the third outlet end disconnected.

7. The dual-fluid channel jet device according to claim 6, characterized in that, The dual-fluid channel jet device has a first state and a second state. The dual-fluid channel jet device is in the first state, the first valve core is in the first position, and the second valve core is in the third position; The dual-fluid channel jet device is in the second state, the first valve core is in the second position, and the second valve core is in the fourth position.

8. The dual-fluid channel jet device according to claim 6, characterized in that, The third inlet end is provided with an annular retaining ring, the third outlet end is provided with a filter plate, a second spring is provided between the second valve core and the filter plate, the second valve core is provided with a fourth guide hole, the second valve core is in the third position, the fourth guide hole is connected to the central through hole of the retaining ring so that the third inlet end and the third outlet end are connected, the second valve core is in the fourth position, the second valve core abuts against the retaining ring, the fourth guide hole is disconnected from the central through hole of the retaining ring so that the passage between the third inlet end and the third outlet end is disconnected.

9. The dual-fluid channel jet device according to any one of claims 1-8, characterized in that, The jet nozzles are multiple and are arranged circumferentially around the first valve body.

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