Multi-channel rotary switching valve

Abstract

The invention provides a multi-channel rotary switching valve, and belongs to the technical field of switching valves. The multi-channel rotary valve solves the problem that the sealing performance becomes poor after an existing multi-channel rotary valve is used for a long time. The multi-channel rotary switching valve comprises a lower disc, an upper disc rotationally arranged on the lower disc and a motor used for driving the upper disc to rotate, an annular face is arranged on the lower disc, a plurality of through holes circumferentially distributed along the rotation center line of the upper disc are formed in the annular face, a tap is installed in each through hole, a public connecting piece is arranged on the upper disc, and the public connecting piece is arranged on the lower disc. A connecting hole used for being communicated with the through hole is formed in the public connecting piece, and an elastic structure used for enabling the public connecting piece to abut against the annular face all the time is arranged between the upper disc and the public connecting piece. And under the action of the elastic structure, the public connecting piece is always propped against the annular surface, so that the sealing performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of switching valves and relates to a multi-channel rotary switching valve. Background Art

[0002] In various instruments and equipment, it is often necessary to use one-to-multiple gas or liquid circuit conversion. Currently, multiple valves and multi-way connectors are usually used on the market for conversion. When there are many circuits that need to be switched, the volume occupied will be relatively large and the cost will be high.

[0003] To this end, a Chinese patent discloses a multi-channel rotary valve device [application publication number is CN112696508A], including a valve core, a valve body, a valve cover, a positioning pin, an inverted cone joint and a groove-type photoelectric switch sensor; the valve core is divided into a movable valve core and a fixed valve core, and the two are sealed by plane matching, and the sealing accuracy is high; the valve body and the valve cover are provided with matching threads, and the valve cover is tightened to axially press the valve core; the positioning pin is used to circumferentially position the fixed valve core; the inverted cone joint is screwed into the threaded hole of the fixed valve core to connect the pipeline.

[0004] It uses a stepper motor to control the rotation of the moving valve core, so that the moving valve core can be rotated to a certain angle as needed, thereby making the corresponding channel conductive. During the rotation process, the moving valve core and the fixed valve core are worn due to friction, resulting in poor sealing. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to provide a multi-channel rotary switching valve with good sealing performance.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A multi-channel rotary switching valve comprises a lower plate, an upper plate rotatably arranged on the lower plate, and a motor for driving the upper plate to rotate, wherein the lower plate is provided with an annular surface, the annular surface is provided with a plurality of through holes distributed along the circumference of the rotation center line of the upper plate, each of the through holes is provided with a tap, the upper plate is provided with a common connecting piece, the common connecting piece is provided with a connecting hole for communicating with the through hole, and an elastic structure for making the common connecting piece always abut against the annular surface is provided between the upper plate and the common connecting piece.

[0008] The tap is set at the lower end of the through hole and extends downward. There is one common connector and its lower end is in sealing contact with the annular surface. The rotation of the motor drives the upper coil to rotate around the center line, thereby accurately bringing the common connector to the corresponding tap, and realizing the connection between the connection hole and the through hole. When the contact between the common connector and the annular surface is worn, the elastic structure makes the common connector always rest on the annular surface, thereby improving the sealing. The motor is a servo motor, which is precisely positioned by the servo motor code change, and the repeat positioning accuracy can reach 0.006.

[0009] In the above-mentioned multi-channel rotary switching valve, a mounting hole perpendicular to the annular surface is provided on the upper plate, a limiting plug is fixed at the upper end of the mounting hole, a guide hole perpendicular to the annular surface is provided in the limiting plug, the common connecting member is slidably fitted in the guide hole, and the elastic structure is arranged between the limiting plug and the common connecting member.

[0010] The common connecting piece is cylindrical and slides in the guide hole. The connecting hole coaxially passes through the common connecting piece. The elastic structure acts on the common connecting piece, so that the common connecting piece has a tendency to move toward the annular surface, ensuring that the common connecting piece always rests against the annular surface.

[0011] In the above-mentioned multi-channel rotary switching valve, a limit stop edge is provided on the common connecting member, and the elastic structure is a spring sleeved on the common connecting member, the upper end of the spring abuts against the limit plug, and the lower end of the spring acts on the limit stop edge.

[0012] The spring is in a compressed state, and the spring force makes the common connection piece always press against the annular surface. The limit plug is threadedly connected in the mounting hole. When installing, first put the common connection piece into the mounting hole, then put the spring on the common connection piece, then put the limit plug on the common connection piece, and finally make the common connection piece threadedly connected with the mounting hole.

[0013] In the above-mentioned multi-channel rotary switching valve, a first annular groove surrounding the connecting hole is provided at the lower end of the common connecting member, and a first O-ring is provided in the first annular groove.

[0014] Under the action of the spring, the first O-ring is always pressed against the annular surface. When the O-ring is worn, the spring can automatically adjust the compression degree of the O-ring to ensure the sealing performance.

[0015] In the above multi-channel rotary switching valve, a second annular groove is provided at the lower end side of the common connection piece, and a second O-ring is provided in the second annular groove. The second O-ring can not only ensure the sealing of the installation cavity, but also improve the stability of the common connection piece.

[0016] In the above multi-channel rotary switching valve, a limiting step is provided at the lower part of the mounting hole, and the outer diameter of the limiting stop edge is larger than the inner diameter of the limiting step, which can effectively prevent the common connection member from falling out of the mounting hole.

[0017] In the above-mentioned multi-channel rotary switching valve, the lower plate is provided with an annular cavity, the annular surface is located at the inner bottom of the annular cavity, the upper plate is provided with an annular protrusion extending into the annular groove, and the common connecting member is arranged in the annular protrusion.

[0018] In the above-mentioned multi-channel rotary switching valve, a liquid inlet hole and a liquid outlet hole are also provided at the bottom of the annular groove. A cleaning connector is provided at the liquid inlet hole, and a waste liquid connector is provided at the liquid outlet hole. The liquid inlet hole and the liquid outlet hole are arranged opposite to each other along the rotation center line of the upper plate.

[0019] The residual waste liquid generated by the switching during the liquid flow is connected to the cleaning liquid through the cleaning joint to clean the residual waste liquid generated by the switching during the liquid flow in the annular cavity, and is discharged through the waste liquid joint.

[0020] In the above-mentioned multi-channel rotary switching valve, the motor is fixed on the lower plate, and the upper plate is installed on the rotating shaft of the motor.

[0021] In the above-mentioned multi-channel rotary switching valve, a limit bracket is provided on the lower plate, and a limit block is provided on the upper plate, and the limit block can be against the limit bracket.

[0022] The limit block is limited by the limit bracket, so as to achieve the purpose of circumferential limit of the upper plate and prevent the upper plate from rotating at an angle greater than 360°. When the limit block is against the limit bracket, the common connector is just connected to one of the taps or the waste liquid connector.

[0023] Compared with the prior art, the multi-channel rotary switching valve has the following advantages:

[0024] The rotation of the motor drives the upper coil to rotate around the rotating center line, thereby accurately bringing the common connector to the corresponding tap, thereby realizing the connection between the connecting hole and the through hole; when the contact between the common connector and the annular surface is worn, the elastic structure makes the common connector always rest against the annular surface, thereby improving the sealing performance; the residual waste liquid generated by switching during liquid flow is connected to the cleaning liquid through the cleaning joint to clean the residual waste liquid generated by switching during liquid flow in the annular cavity, and discharged through the waste liquid joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the multi-channel rotary switching valve.

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure when the bracket is omitted.

[0027] Figure 3 yes Figure 1 Cross-sectional view without bracket.

[0028] Figure 4 It is an enlarged schematic diagram of the common connection.

[0029] In the figure, 1, lower plate; 2, upper plate; 3, motor; 4, annular surface; 5, through hole; 6, tap; 7, common connector; 8, connecting hole; 9, mounting hole; 10, limit plug; 11, guide hole; 12, limit stop edge; 13, spring; 14, first O-ring; 15, second O-ring; 16, limit step; 17, annular cavity; 18, annular protrusion; 19, cleaning connector; 20, waste liquid connector; 21, limit bracket; 22, limit stop block. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1 The multi-channel rotary switching valve shown in FIG. 1 includes a lower plate 1, an upper plate 2 rotatably arranged on the lower plate 1, and a motor 3 for driving the upper plate 2 to rotate. Specifically, as shown in FIG. Figure 3 As shown, the motor 3 is fixed on the lower plate 1, and the upper plate 2 is installed on the rotating shaft of the motor 3. In order to facilitate the installation of the switching valve, as shown in FIG. Figure 1 As shown, a bracket is arranged on the lower plate 1.

[0032] like Figure 3 As shown, the lower plate 1 is provided with an annular cavity 17, the inner bottom of the annular cavity 17 is provided with an annular surface 4, and the annular surface 4 is provided with a plurality of through holes 5 distributed along the circumference of the rotation center line of the upper plate 2, as shown in FIG. Figure 1 and Figure 3 As shown, each through hole 5 is installed with a tap 6, which is arranged at the lower end of the through hole 5 and extends downward, the upper plate 2 is provided with an annular protrusion 18 extending into the annular groove, the annular protrusion 18 is provided with a common connector 7, the common connector 7 is provided with a connecting hole 8 for communicating with the through hole 5, an elastic structure for making the common connector 7 always abut against the annular surface 4 is provided between the upper plate 2 and the common connector 7, there is one common connector 7 and the lower end is in sealing contact with the annular surface 4.

[0033] The rotation of the motor 3 drives the upper plate 2 to rotate around the center line of rotation, thereby accurately bringing the common connector 7 to the corresponding tap 6, and realizing the connection between the connection hole 8 and the through hole 5. When the contact between the common connector 7 and the annular surface 4 is worn, the elastic structure makes the common connector 7 always against the annular surface 4, thereby improving the sealing performance. The motor 3 is a servo motor 3, which is precisely positioned by changing the code of the servo motor 3, and the repeat positioning accuracy can reach 0.006.

[0034] like Figure 3As shown, the upper plate 2 is provided with a mounting hole 9 which is perpendicular to the annular surface 4, a limiting plug 10 is fixed at the upper end of the mounting hole 9, a guide hole 11 which is perpendicular to the annular surface 4 is provided in the limiting plug 10, the common connecting member 7 is slidably fitted in the guide hole 11, and an elastic structure is provided between the limiting plug 10 and the common connecting member 7.

[0035] The common connecting member 7 is cylindrical and slides in the guide hole 11. The connecting hole 8 coaxially passes through the common connecting member 7. The elastic structure acts on the common connecting member 7, so that the common connecting member 7 has a tendency to move toward the annular surface 4, ensuring that the common connecting member 7 always rests against the annular surface 4.

[0036] like Figure 4 As shown, a limit stop edge 12 is provided on the common connecting member 7 , and the elastic structure is a spring 13 sleeved on the common connecting member 7 , the upper end of the spring 13 abuts against the limit plug 10 , and the lower end of the spring 13 acts on the limit stop edge 12 .

[0037] The spring 13 is in a compressed state, and the elastic force of the spring 13 makes the common connection part 7 always press against the annular surface 4. The limit plug 10 is threadedly connected in the mounting hole 9. When installing, the common connection part 7 is first placed in the mounting hole 9, and then the spring 13 is put on the common connection part 7, and then the limit plug 10 is put on the common connection part 7, and finally the common connection part 7 is threadedly connected to the mounting hole 9.

[0038] like Figure 4 As shown, a first annular groove surrounding the connecting hole 8 is provided at the lower end of the common connecting member 7, and a first O-ring 14 is provided in the first annular groove.

[0039] Under the action of the spring 13, the first O-ring 14 always abuts against the annular surface 4. When the O-ring is worn, the spring 13 can automatically adjust the compression degree of the O-ring to ensure the sealing performance.

[0040] like Figure 4 As shown, a second annular groove is provided at the lower end side of the common connection member 7, and a second O-ring 15 is provided in the second annular groove. The second O-ring 15 can not only ensure the sealing of the installation cavity, but also improve the stability of the common connection member 7.

[0041] like Figure 4 As shown, a limiting step 16 is provided at the lower portion of the mounting hole 9 , and the outer diameter of the limiting stop edge 12 is larger than the inner diameter of the limiting step 16 , which can effectively prevent the common connecting member 7 from escaping from the mounting hole 9 .

[0042] like Figure 2As shown, a liquid inlet hole and a liquid outlet hole are also provided at the bottom of the annular groove, a cleaning joint 19 is provided at the liquid inlet hole, and a waste liquid joint 20 is provided at the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are arranged opposite to each other along the rotation center line of the upper plate 2. The residual waste liquid generated by switching during liquid flow is connected to the cleaning liquid through the cleaning joint 19 to clean the residual waste liquid generated by switching during liquid flow in the annular cavity 17, and discharged through the waste liquid joint 20.

[0043] like Figure 1-3 As shown, a limit bracket 21 is provided on the lower plate 1, and a limit block 22 is provided on the upper plate 2, and the limit block 22 can be against the limit bracket 21. The limit block 22 is limited by the limit bracket 21, so as to achieve the purpose of circumferential limit of the upper plate 2, and prevent the upper plate 2 from rotating at an angle greater than 360°. When the limit block 22 is against the limit bracket 21, the common connector 7 is just connected with one of the taps 6 or the waste liquid connector 20.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A multi-channel rotary switching valve, characterized in that: The invention comprises a lower plate (1), an upper plate (2) rotatably arranged on the lower plate (1), and a motor (3) for driving the upper plate (2) to rotate. The lower plate (1) is provided with an annular surface (4), the annular surface (4) is provided with a plurality of through holes (5) distributed along the circumference of the rotation center line of the upper plate (2), each through hole (5) is provided with a tap (6), the upper plate (2) is provided with a common connecting piece (7), the common connecting piece (7) is provided with a connecting hole (8) for communicating with the through hole (5), and an elastic structure for making the common connecting piece (7) always abut against the annular surface (4) is provided between the upper plate (2) and the common connecting piece (7).

2. The multi-channel rotary switching valve according to claim 1, characterized in that: The upper plate (2) is provided with a mounting hole (9) perpendicular to the annular surface (4); a limit plug (10) is fixed at the upper end of the mounting hole (9); a guide hole (11) perpendicular to the annular surface (4) is provided in the limit plug (10); the common connecting member (7) is slidably fitted in the guide hole (11); and the elastic structure is provided between the limit plug (10) and the common connecting member (7).

3. The multi-channel rotary switching valve according to claim 2, characterized in that: The common connecting member (7) is provided with a limit stop edge (12); the elastic structure is a spring (13) sleeved on the common connecting member (7); the upper end of the spring (13) abuts against the limit stop plug (10); and the lower end of the spring (13) acts on the limit stop edge (12).

4. The multi-channel rotary switching valve according to claim 1, characterized in that: The lower end of the common connecting member (7) is provided with a first annular groove arranged around the connecting hole (8), and a first O-ring (14) is provided in the first annular groove.

5. The multi-channel rotary switching valve according to claim 1, characterized in that: A second annular groove is provided on the lower end side of the common connecting member (7), and a second O-ring (15) is provided in the second annular groove.

6. The multi-channel rotary switching valve according to claim 3, characterized in that: A limiting step (16) is provided at the lower portion of the mounting hole (9), and the outer diameter of the limiting stop edge (12) is greater than the inner diameter of the limiting step (16).

7. The multi-channel rotary switching valve according to claim 1, characterized in that: The lower plate (1) is provided with an annular cavity (17), the annular surface (4) is located at the inner bottom of the annular cavity (17), the upper plate (2) is provided with an annular protrusion (18) extending into the annular groove, and the common connecting member (7) is arranged in the annular protrusion (18).

8. The multi-channel rotary switching valve according to claim 1, characterized in that: The bottom of the annular groove is also provided with a liquid inlet and a liquid outlet. The liquid inlet is provided with a cleaning joint (19), and the liquid outlet is provided with a waste liquid joint (20). The liquid inlet and the liquid outlet are arranged opposite to each other along the rotation center line of the upper plate (2).

9. The multi-channel rotary switching valve according to claim 1, characterized in that: The motor (3) is fixed on the lower plate (1), and the upper plate (2) is mounted on the rotating shaft of the motor (3).

10. The multi-channel rotary switching valve according to claim 1, characterized in that: The lower plate (1) is provided with a limit bracket (21), and the upper plate (2) is provided with a limit stopper (22), and the limit stopper (22) can abut against the limit bracket (21).

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