Wind tunnel contraction section airflow stabilizing device

Abstract

The invention belongs to the technical field of wind tunnel contraction sections, and discloses a wind tunnel contraction section airflow stabilizing device which comprises a slide rail seat, a plurality of assembly units and a wind tunnel unit are arranged on the slide rail seat, the wind tunnel unit comprises a rectifier tube, a contraction tube and an experiment tube which are connected in sequence, and the contraction tube is located between the rectifier tube and the experiment tube. Integrated connecting rings are fixedly arranged at the two ends of the rectifier tube, the two ends of the shrinkage tube and the two ends of the experiment tube, the rectifier tube and the shrinkage tube as well as the shrinkage tube and the experiment tube are fixed through assembling units, each assembling unit comprises a base, a lower positioning mechanism is arranged in the middle of each base, and side positioning mechanisms are arranged at the two ends of each base; according to the invention, through cooperation of the self-positioning pieces, the shell, the cylinder and the like, by means of the gravity of the wind tunnel unit, each self-positioning piece is attached to the outer side of the connecting ring in the wind tunnel unit, and through communication arrangement of the shell, the supporting force of each self-positioning piece to the connecting ring is equal.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel contraction sections, and in particular relates to an airflow stabilizing device for a wind tunnel contraction section. Background Art

[0002] When assembling a wind tunnel, it is necessary to first separate the various parts of the wind tunnel, and then hoist them through external hoisting equipment, and then cooperate with the operator's multiple operations to connect the various components of the wind tunnel together; the cross-sectional areas at both ends of the wind tunnel contraction section are different in size, so that the flow rate and flow field requirements can be controlled to meet them. However, during assembly, the existing wind tunnel contraction section is cumbersome to operate and needs to be adjusted multiple times, resulting in inconvenient technical problems. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an airflow stabilizing device for a wind tunnel contraction section, which effectively solves the problem that the existing wind tunnel contraction section is complicated to operate during assembly and requires multiple adjustments, resulting in inconvenience.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an airflow stabilizing device for a contraction section of a wind tunnel, comprising a slide rail seat, on which a plurality of assembly units and a wind tunnel unit are arranged, wherein the wind tunnel unit comprises a rectifier tube, a contraction tube and a test tube connected in sequence, the contraction tube is located between the rectifier tube and the test tube, both ends of the rectifier tube, both ends of the contraction tube and both ends of the test tube are fixedly provided with an integrated connecting ring, the rectifier tube and the contraction tube, and the contraction tube and the test tube are fixed by the assembly unit, the assembly unit comprises a base, a lower positioning mechanism is arranged in the middle of the base, and side positioning mechanisms are arranged at both ends of the base Mechanism; wherein the lower positioning mechanism includes a lower positioning assembly and a lifting assembly for lifting the lower positioning assembly, the side positioning mechanism includes a side positioning assembly and a power assembly for driving the side positioning assembly, and the structure of the lower positioning assembly is the same as that of the side positioning assembly; wherein the lower positioning assembly includes a support plate, the support plate is provided with an opening groove and a mounting groove inside, the opening groove is located above the mounting groove, a plurality of self-positioning parts are provided inside the opening groove, a shell is fixedly provided inside the mounting groove, a plurality of cylinders are fixedly provided inside the shell, the interior of each cylinder is connected to the shell, and the cylinders and the self-positioning parts are provided one by one.

[0005] Preferably, the self-positioning member includes a top plate, a bottom plate, a return spring, a connecting rod, a piston, and a support spring, wherein the top plate and the bottom plate are hingedly arranged, and the top plate and the bottom plate are connected by symmetrically arranged return springs, the bottom plate is fixed to the piston by a connecting rod, the piston and the support spring are movably arranged in the cylinder, and the support spring is located below the piston; wherein a rod hole for the connecting rod to pass through is opened on the support plate, and a circular hole connected to the cylinder is opened on the shell.

[0006] Preferably, the open groove is symmetrically formed with a top groove inside, and side thrust plates are slidably arranged in the two top grooves. A plurality of columnar grooves and a plurality of connecting grooves are provided on the support plate. The top grooves are connected with the connecting grooves through the columnar grooves in turn, and the connecting grooves are connected with the shell through conduits. A sliding column, a sliding rod and a telescopic spring are arranged in the top groove, wherein the sliding column is slidably arranged in the top groove, the sliding column is fixedly arranged with the side thrust plates through the sliding rod, and the telescopic spring is wrapped around the sliding rod.

[0007] Preferably, a surface of the side push plate close to the support plate is a vertical surface, and an upper surface of the side push plate is an inclined surface.

[0008] Preferably, the lifting assembly includes a rotating rod, a screw rod and two guide rods, wherein the rotating rod is fixedly arranged on the screw rod, the screw rod is rotatably arranged on the support plate, the screw rod is threadedly matched with the screw hole on the base, and the two guide rods are fixedly arranged on the support plate, and the two guide rods are slidably matched with the rod holes on the base.

[0009] Preferably, the power assembly includes an outer support, an inner support, an electric push rod, and a power frame, wherein the outer support and the inner support are fixedly arranged on the base, the electric push rod is hingedly arranged on the outer support, the output end of the electric push rod is hingedly arranged on the power frame, the power frame is hingedly arranged on the inner support, and the side positioning assembly is arranged on the free end of the power frame.

[0010] Preferably, the slide rail seat is symmetrically formed with slide grooves, the base is symmetrically fixed with sliders, the sliders are slidably matched with the slide grooves, bolts and gaskets are arranged below the slide rail seat, the bolts pass through the gaskets and the slide grooves in turn and then threadedly match with the screw holes on the sliders.

[0011] Preferably, the connecting ring on the rectifier tube and the connecting ring on the shrink tube are both provided with a receiving groove, a sealing ring is arranged between the two receiving grooves, two inner cavities are formed inside the sealing ring, and the outer sides of the two inner cavities are fixedly connected with pipe joints with solenoid valves, and the two pipe joints are connected to the interior of the shell through connecting pipes.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. During work, the lower positioning mechanism and the side positioning mechanism can quickly complete the assembly process of the wind tunnel unit, thereby reducing manual operations during assembly; 2. During operation, by means of the coordination of the self-locating parts, the shell and the cylinder, etc., each self-locating part can be attached to the outside of the connecting ring in the wind tunnel unit by means of the gravity of the wind tunnel unit, and by means of the connection setting of the shell, the supporting force of each self-locating part on the connecting ring can be equal, thereby avoiding damage to the supporting part caused by uneven force; 3. During operation, the top plate, bottom plate and return spring are arranged so that the top plate in each self-locating part can be closely fitted to the outside of the connecting ring, thereby increasing the effective contact area between the top plate and the connecting ring, further reducing the extrusion force between the two, and playing a protective role during assembly; 4. During operation, the side thrust plates can be used to push the connecting rings with the help of the gravity of the wind tunnel unit during assembly, so that the adjacent connecting rings fit more closely and the sealing performance after assembly is improved; 5. During operation, the two inner cavities in the sealing ring are provided with a stable pressure inside the inner cavity by virtue of the gravity of the wind tunnel unit, thereby playing a good sealing role; and when one of the inner cavities is damaged due to long-term contact with the containing groove, the solenoid valve on the corresponding pipe joint is closed, and the pressure will be completely transmitted to the inside of the other inner cavity, thereby continuing to play a sealing role through the other inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0014] In the attached picture: Figure 1 It is a schematic structural diagram of an airflow stabilizing device for a wind tunnel contraction section according to the present invention; Figure 2 It is a schematic diagram of the wind tunnel unit structure of the present invention; Figure 3 It is a schematic diagram of the base installation structure of the present invention; Figure 4 It is a schematic diagram of the support plate installation structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the support plate of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the support plate of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the cross-sectional structure of the wind tunnel unit of the present invention; Fig. 9 For the present invention Figure 8 The enlarged structural diagram at C in the middle; Fig.10 For the present invention Figure 1 Enlarged structural diagram at A in the middle.

[0015] In the figure: 1. slide rail seat; 2. rectifier tube; 3. contraction tube; 4. experimental tube; 5. connecting ring; 6. base; 7. support plate; 8. opening groove; 9. mounting groove; 10. shell; 11. cylinder; 12. top plate; 13. bottom plate; 14. return spring; 15. connecting rod; 16. piston; 17. support spring; 18. top groove; 19. side push plate; 20. columnar groove; 21. connecting groove; 22. slide column; 23. slide rod; 24. rotating rod; 25. screw; 26. guide rod; 27. outer support; 28. inner support; 29. ​​electric push rod; 30. power frame; 31. slide groove; 32. slider; 33. bolt; 34. gasket; 35. receiving groove; 36. sealing ring; 37. inner cavity; 38. pipe joint; 39. connecting pipe; 40. telescopic spring. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] Depend on Figure 1-10The present invention relates to an airflow stabilizing device for a contraction section of a wind tunnel. In order to solve the technical problem that the existing contraction section of a wind tunnel is complicated to operate and needs to be adjusted many times during assembly, resulting in inconvenience, the device comprises a slide rail seat 1, on which a plurality of assembly units and a wind tunnel unit are arranged, wherein the wind tunnel unit comprises a rectifier tube 2, a contraction tube 3 and a test tube 4 which are connected in sequence, the contraction tube 3 is located between the rectifier tube 2 and the test tube 4, both ends of the rectifier tube 2, both ends of the contraction tube 3 and both ends of the test tube 4 are fixedly provided with an integrated connecting ring 5, the rectifier tube 2 and the contraction tube 3 as well as the contraction tube 3 and the test tube 4 are fixed by an assembly unit, and the assembly unit comprises a base 6, the middle part of the base 6 is provided with a lower Positioning mechanism, both ends of the base 6 are provided with side positioning mechanisms; wherein the lower positioning mechanism includes a lower positioning assembly and a lifting assembly for lifting the lower positioning assembly, and the side positioning mechanism includes a side positioning assembly and a power assembly for driving the side positioning assembly, and the structure of the lower positioning assembly is the same as that of the side positioning assembly; wherein the lower positioning assembly includes a support plate 7, and an opening groove 8 and a mounting groove 9 are provided inside the support plate 7, and the opening groove 8 is located above the mounting groove 9, and a plurality of self-positioning members are provided inside the opening groove 8, and a shell 10 is fixedly provided inside the mounting groove 9, and a plurality of cylinders 11 are fixedly provided inside the shell 10, and the interior of each cylinder 11 is communicated with the shell 10, and the cylinders 11 are provided one-to-one with the self-positioning members; With such a design, when in use, the wind tunnel unit is placed in the assembly unit on the slide rail seat 1 through external lifting equipment, so that the wind tunnel unit is above the lower positioning component in the lower positioning mechanism in the assembly unit, and then the lower positioning component is adjusted in the vertical direction by the lifting component to make the wind tunnel unit in the required installation position, and then the side positioning component can be driven to move by the power component to dock and fix the wind tunnel unit from the side; the specific working process of the lower positioning component is as follows: When the connecting ring 5 on the shrink tube 3 and the connecting ring 5 on the rectifier tube 2 are fitted together and placed in the open groove 8 in the support plate 7, the multiple self-locating parts in the open groove 8 will be squeezed by gravity. After being pressed, the multiple self-locating parts move into the cylinder 11 on the shell 10, so that the liquid or gas in the cylinder 11 enters the interior of the shell 10. Since the multiple cylinders 11 are connected through the shell 10, the supporting force of each self-locating part on the corresponding connecting ring 5 can be equal, avoiding damage to the wind tunnel unit due to uneven force, thereby playing a protective role.

[0018] Specifically, considering that the shape of the connecting ring 5 is an arc, the contact area between the connecting ring 5 and the self-positioning member is extremely limited, resulting in excessive extrusion force at the contact position, which is easy to cause damage to the connecting ring 5. In order to solve this technical problem, the self-positioning member includes a top plate 12, a bottom plate 13, a reset spring 14, a connecting rod 15, a piston 16, and a support spring 17, wherein the top plate 12 is hingedly arranged with the bottom plate 13, and the top plate 12 and the bottom plate 13 are connected by symmetrically arranged reset springs 14, the bottom plate 13 is fixedly arranged with the piston 16 by the connecting rod 15, the piston 16 and the support spring 17 are both movably arranged in the cylinder 11, and the support spring 17 is located below the piston 16; wherein the support plate 7 is provided with a rod hole for the connecting rod 15 to pass through, and the shell 10 is provided with a circular hole connected with the cylinder 11; With such a design, when the connecting ring 5 is placed on the top plate 12, under the action of gravity, the top plate 12 drives the piston 16 to move through the bottom plate 13 and the connecting rod 15 in sequence. After the piston 16 slides in the cylinder 11, it squeezes the liquid or gas in the cylinder 11 to allow the liquid or gas to enter the interior of the shell 10.

[0019] It should be noted that the upper surface of the top plate 12 can be set to an arc shape, and a flexible pad can be set on the upper surface of the top plate 12 to increase the effective contact area between the top plate 12 and the connecting ring 5, thereby reducing the squeezing force on the connecting ring 5 by increasing the contact area, thereby playing a protective role; since the top plate 12 can rotate around the bottom plate 13 and maintain its initial state through the reset spring 14, after the side of the connecting ring 5 contacts the remaining self-positioning components, the top plates 12 in the self-positioning parts on both sides can also be rotated and fit onto the connecting ring 5 to ensure the effective contact area.

[0020] Furthermore, in order to make the two adjacent connecting rings 5 ​​fit more closely during assembly, top grooves 18 are symmetrically formed inside the open grooves 8, and side thrust plates 19 are slidably arranged in the two top grooves 18. A plurality of columnar grooves 20 and a plurality of connecting grooves 21 are opened on the support plate 7. The top grooves 18 are connected with the connecting grooves 21 through the columnar grooves 20 in turn, and the connecting grooves 21 are connected with the housing 10 through a conduit, wherein a sliding column 22, a sliding rod 23 and a telescopic spring 40 are arranged in the top grooves 18, wherein the sliding column 22 is slidably arranged in the top grooves 18, the sliding column 22 is fixedly arranged with the side thrust plates 19 through the sliding rod 23, and the telescopic spring 40 surrounds the sliding rod 23; With such a design, when the liquid or gas in the shell 10 flows under pressure, it can pass through the conduit, the connecting groove 21, and enter the interior of the cylindrical groove 20 in sequence. Under the transmission of pressure, the sliding column 22 drives the side thrust plate 19 to move through the sliding rod 23, and the connecting ring 5 is pushed through the side thrust plate 19, so that the two adjacent connecting rings 5 ​​fit tightly together.

[0021] Specifically, the side of the side push plate 19 close to the support plate 7 is a vertical surface, and the upper surface of the side push plate 19 is an inclined surface; such a design, through the setting of the inclined surface, can play a guiding role for the connecting ring 5, making it easier for the connecting ring 5 to enter the interior of the opening groove 8.

[0022] Specifically, the lifting assembly includes a rotating rod 24, a screw rod 25 and two guide rods 26, wherein the rotating rod 24 is fixedly arranged on the screw rod 25, the screw rod 25 is rotatably arranged on the support plate 7, the screw rod 25 is threadedly matched with the screw hole on the base 6, and the two guide rods 26 are fixedly arranged on the support plate 7, and the two guide rods 26 are slidably matched with the rod holes on the base 6; With this design, the screw rod 25 is driven to move by the rotating rod 24, and under the limiting guidance of the guide rod 26, the screw rod 25 drives the support plate 7 to move through the thread, so as to adjust the height of the support plate 7 to meet the needs of actual assembly.

[0023] Specifically, the power assembly includes an outer support 27, an inner support 28, an electric push rod 29, and a power frame 30, wherein the outer support 27 and the inner support 28 are fixedly arranged on the base 6, the electric push rod 29 is hingedly arranged on the outer support 27, the output end of the electric push rod 29 is hingedly arranged on the power frame 30, the power frame 30 is hingedly arranged on the inner support 28, and the side positioning assembly is arranged on the free end of the power frame 30; In this design, the power frame 30 is driven to move by the electric push rod 29, so that the power frame 30 rotates around the inner support 28, and the two adjacent connecting rings 5 ​​on the side are limited and fixed by the side positioning assembly on the power frame 30.

[0024] Specifically, a slide groove 31 is symmetrically formed on the slide rail seat 1, and a slider 32 is symmetrically fixedly arranged on the base 6. The slider 32 slides with the slide groove 31. A bolt 33 and a gasket 34 are arranged below the slide rail seat 1. The bolt 33 passes through the gasket 34 and the slide groove 31 in sequence and then threads with the screw hole on the slider 32. With this design, when in use, the base 6 can be pushed according to actual needs, so that the slider 32 on the base 6 slides in the slide groove 31 on the slide rail seat 1, so as to adjust the position of the base 6 according to actual needs. After the adjustment is completed, the slider 32 can be locked by the bolt 33 and the gasket 34.

[0025] Furthermore, considering that conventional sealing gaskets are all elastic structures, their sealing performance will decrease after long-term use. In order to solve this technical problem, a receiving groove 35 is provided on the connecting ring 5 on the rectifier tube 2 and the connecting ring 5 on the shrink tube 3. A sealing ring 36 is provided between the two receiving grooves 35. Two inner cavities 37 are formed inside the sealing ring 36. Pipe joints 38 with solenoid valves are fixedly connected to the outsides of the two inner cavities 37. The two pipe joints 38 are connected to the inside of the housing 10 through connecting pipes 39. With such a design, by utilizing the gravity of the wind tunnel unit, the liquid or gas in the shell 10 enters into the two inner cavities 37 through the connecting pipe 39 and the two pipe joints 38 in turn, so that the interior of the inner cavity 37 maintains a stable pressure, so that the sealing ring 36 fits tightly in the receiving groove 35 and plays a good sealing role; and sensors can be arranged inside the two inner cavities 37. When one of the inner cavities 37 is damaged due to long-term contact with the receiving groove 35, the solenoid valve on the corresponding pipe joint 38 is closed. At this time, the pressure will be completely transmitted to the interior of the other inner cavity 37, thereby continuing to play a sealing role through the other inner cavity 37.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An airflow stabilizing device for a contraction section of a wind tunnel, comprising a slide rail seat (1), a plurality of assembly units and a wind tunnel unit being arranged on the slide rail seat (1), wherein the wind tunnel unit comprises a rectifier tube (2), a contraction tube (3) and a test tube (4) connected in sequence, the contraction tube (3) being located between the rectifier tube (2) and the test tube (4), both ends of the rectifier tube (2), both ends of the contraction tube (3) and both ends of the test tube (4) being fixedly provided with an integral connection ring (5), the rectifier tube (2) and the contraction tube (3) and the test tube (4) being fixedly fixed by the assembly unit, characterized in that: The assembly unit comprises a base (6), a lower positioning mechanism is arranged in the middle of the base (6), and side positioning mechanisms are arranged at both ends of the base (6); wherein the lower positioning mechanism comprises a lower positioning assembly and a lifting assembly for lifting the lower positioning assembly, and the side positioning mechanism comprises a side positioning assembly and a power assembly for driving the side positioning assembly, and the structure of the lower positioning assembly is the same as that of the side positioning assembly; wherein the lower positioning assembly comprises a support plate (7), an opening groove (8) and a mounting groove (9) are arranged inside the support plate (7), the opening groove (8) is located above the mounting groove (9), a plurality of self-positioning members are arranged inside the opening groove (8), a shell (10) is fixedly arranged inside the mounting groove (9), a plurality of cylinders (11) are fixedly arranged inside the shell (10), the interior of each cylinder (11) is communicated with the shell (10), and the cylinders (11) and the self-positioning members are arranged one by one.

2. The airflow stabilizing device for the contraction section of a wind tunnel according to claim 1, characterized in that: The self-positioning member comprises a top plate (12), a bottom plate (13), a return spring (14), a connecting rod (15), a piston (16), and a support spring (17), wherein the top plate (12) and the bottom plate (13) are hingedly arranged, and the top plate (12) and the bottom plate (13) are connected via symmetrically arranged return springs (14), the bottom plate (13) is fixedly arranged with the piston (16) via the connecting rod (15), the piston (16) and the support spring (17) are both movably arranged in the cylinder (11), and the support spring (17) is located below the piston (16); wherein a rod hole for the connecting rod (15) to pass through is formed on the support plate (7), and a circular hole communicating with the cylinder (11) is formed on the shell (10).

3. The airflow stabilizing device for the contraction section of a wind tunnel according to claim 2, characterized in that: The opening groove (8) is symmetrically formed with a top groove (18), and a side thrust plate (19) is slidably arranged in the two top grooves (18). A plurality of columnar grooves (20) and a plurality of connecting grooves (21) are formed on the support plate (7). The top groove (18) is connected with the connecting groove (21) in turn through the columnar groove (20), and the connecting groove (21) is connected with the housing (10) through a conduit. A sliding column (22), a sliding rod (23) and a telescopic spring (40) are arranged in the top groove (18), wherein the sliding column (22) is slidably arranged in the top groove (18), the sliding column (22) is fixedly arranged with the side thrust plate (19) through the sliding rod (23), and the telescopic spring (40) surrounds the sliding rod (23).

4. The airflow stabilizing device for the contraction section of a wind tunnel according to claim 3, characterized in that: The side thrust plate (19) close to the support plate (7) is a vertical surface, and the upper surface of the side thrust plate (19) is an inclined surface.

5. The airflow stabilizing device for a wind tunnel contraction section according to claim 1, characterized in that: The lifting assembly comprises a rotating rod (24), a screw rod (25) and two guide rods (26), wherein the rotating rod (24) is fixedly arranged on the screw rod (25), the screw rod (25) is rotatably arranged on the support plate (7), the screw rod (25) is threadedly engaged with a screw hole on the base (6), and the two guide rods (26) are fixedly arranged on the support plate (7), and the two guide rods (26) are slidably engaged with the rod holes on the base (6).

6. The airflow stabilizing device for a wind tunnel contraction section according to claim 1, characterized in that: The power assembly comprises an outer support (27), an inner support (28), an electric push rod (29), and a power frame (30), wherein the outer support (27) and the inner support (28) are both fixedly arranged on the base (6), the electric push rod (29) is hingedly arranged on the outer support (27), the output end of the electric push rod (29) is hingedly arranged on the power frame (30), the power frame (30) is hingedly arranged on the inner support (28), and the side positioning assembly is arranged on the free end of the power frame (30).

7. The airflow stabilizing device for a wind tunnel contraction section according to claim 1, characterized in that: The slide rail seat (1) is symmetrically formed with slide grooves (31), and the base (6) is symmetrically fixed with sliders (32). The sliders (32) are slidably matched with the slide grooves (31). Bolts (33) and washers (34) are provided below the slide rail seat (1). The bolts (33) pass through the washers (34) and the slide grooves (31) in sequence and then threadably match with the screw holes on the sliders (32).

8. The airflow stabilizing device for a wind tunnel contraction section according to claim 1, characterized in that: The connecting ring (5) on the rectifier tube (2) and the connecting ring (5) on the shrink tube (3) are both provided with a receiving groove (35), a sealing ring (36) is provided between the two receiving grooves (35), two inner cavities (37) are formed inside the sealing ring (36), and pipe joints (38) with solenoid valves are fixedly connected to the outsides of the two inner cavities (37), and the two pipe joints (38) are both connected to the interior of the housing (10) through a connecting pipe (39).

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