Multi-channel rotary switching valve

Abstract

The utility model 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] This utility model belongs to the field of switching valve technology and relates to a multi-channel rotary switching valve. Background Technology

[0002] In various instruments and equipment, it is often necessary to use one-to-many gas or liquid circuit switching. Currently, the market usually uses multiple valves and multi-port connectors for switching. When there are many circuits to be switched, the volume will be large and the cost will be high.

[0003] To address this, a Chinese patent discloses a multi-channel rotary valve device [application publication number CN112696508A], comprising a valve core, valve body, valve cover, positioning pin, inverted conical joint, and grooved photoelectric switch sensor; the valve core is divided into two parts, a moving valve core and a fixed valve core, which are sealed by planar fit, resulting in high sealing accuracy; the valve body and valve cover have mating threads, and tightening the valve cover axially presses the valve core; the positioning pin circumferentially positions the fixed valve core; the inverted conical joint is screwed into the threaded hole of the fixed valve core for pipeline connection.

[0004] It uses a stepper motor to control the rotation of the moving valve core, so that the moving valve core can rotate at a certain angle as needed, thereby opening the corresponding channel. During the rotation, the moving valve core and the fixed valve core wear due to friction, resulting in poor sealing. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a multi-channel rotary switching valve with good sealing performance.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A multi-channel rotary switching valve includes a lower plate, an upper plate rotatably mounted on the lower plate, and a motor for driving the upper plate to rotate. The lower plate has an annular surface with several through holes circumferentially distributed along the rotation centerline of the upper plate. Each through hole is fitted with a tap. The upper plate has a common connector with a connecting hole for communicating with the through holes. An elastic structure is provided between the upper plate and the common connector to ensure that the common connector always rests against the annular surface.

[0008] The tap is located at the lower end of the through hole and extends downwards. There is one common connector, with its lower end in sealing contact with the annular surface. The motor rotation drives the upper disc to rotate around the center line, precisely bringing the common connector to the corresponding tap, thus connecting the connection hole and the through hole. When wear occurs at the contact point between the common connector and the annular surface, the elastic structure ensures that the common connector remains pressed against the annular surface, improving sealing. The motor is a servo motor, achieving precise positioning with a repeatability of 0.006.

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

[0010] The common connector is cylindrical and slides within the guide hole. The connecting hole is coaxially connected to the common connector. An elastic structure acts on the common connector, giving it a tendency to move toward the annular surface, ensuring that the common connector always rests against the annular surface.

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

[0012] The spring is in a compressed state, and under the action of the spring force, the common connector is always pressed against the annular surface. The limit plug is threaded into the mounting hole. During installation, first, the common connector is placed into the mounting hole, then the spring is put onto the common connector, then the limit plug is put onto the common connector, and finally the common connector is threaded into the mounting hole.

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

[0014] The spring keeps the first O-ring pressed against the annular surface. When the O-ring wears out, the spring can automatically adjust the tightness of the O-ring to ensure a seal.

[0015] In the aforementioned multi-channel rotary switching valve, a second annular groove is provided on the lower side of the common connector, and a second O-ring is provided within the second annular groove. The second O-ring not only ensures the sealing of the mounting cavity but also improves the stability of the common connector.

[0016] In the aforementioned 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 is larger than the inner diameter of the limiting step. This effectively prevents the common connector from dislodging from 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 connector is disposed in the annular protrusion.

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

[0019] The residual waste liquid generated during the liquid switching process is cleaned by the cleaning fluid introduced through the cleaning connector into the annular cavity, and then discharged through the waste liquid connector.

[0020] In the aforementioned multi-channel rotary switching valve, the motor is fixed on the lower plate, and the upper plate is mounted on the motor's shaft.

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

[0022] The limiting bracket limits the limiting block, thereby achieving the purpose of circumferential limiting of the upper plate and preventing the upper plate from rotating more than 360°. When the limiting block abuts against the limiting bracket, the common connector is just connected to one of the taps or waste liquid connectors.

[0023] Compared with existing technologies, this multi-channel rotary switching valve has the following advantages:

[0024] The motor rotation drives the upper plate to rotate around the center line, thereby precisely bringing the common connector to the corresponding tap, realizing the connection between the connecting hole and the through hole; when wear occurs at the contact point between the common connector and the annular surface, the elastic structure ensures that the common connector always presses against the annular surface, improving the sealing performance; residual waste liquid generated during liquid switching is cleaned by the cleaning fluid entering the annular cavity through the cleaning connector, and then discharged through the waste liquid connector. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this multi-channel rotary switching valve.

[0026] Figure 2 yes Figure 1 A structural diagram omitting the support frame.

[0027] Figure 3 yes Figure 1 The sectional view of the support frame is omitted.

[0028] Figure 4 This is an enlarged diagram of the common connector.

[0029] In the diagram, 1. Lower plate; 2. Upper plate; 3. Motor; 4. Annular surface; 5. Through hole; 6. Tap joint; 7. Common connector; 8. Connecting hole; 9. Mounting hole; 10. Limiting plug; 11. Guide hole; 12. Limiting stop; 13. Spring; 14. First O-ring; 15. Second O-ring; 16. Limiting step; 17. Annular cavity; 18. Annular protrusion; 19. Cleaning connector; 20. Waste liquid connector; 21. Limiting bracket; 22. Limiting block. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figure 1 The multi-channel rotary switching valve shown includes a lower plate 1, an upper plate 2 rotatably mounted on the lower plate 1, and a motor 3 for driving the upper plate 2 to rotate. Specifically, as shown... Figure 3 As shown, motor 3 is fixed on the lower plate 1, and upper plate 2 is mounted on the shaft of motor 3. For ease of installation of this switching valve, as... Figure 1 As shown, a support is provided on the lower plate 1.

[0032] like Figure 3 As shown, the lower plate 1 has an annular cavity 17, and the inner bottom of the annular cavity 17 has an annular surface 4. The annular surface 4 has several through holes 5 distributed circumferentially along the rotation centerline of the upper plate 2, such as... Figure 1 and Figure 3 As shown, each through hole 5 is equipped with a tap 6. The tap 6 is located at the lower end of the through hole 5 and extends downward. The upper plate 2 is provided with an annular protrusion 18 that extends 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. There is an elastic structure between the upper plate 2 and the common connector 7 to ensure that the common connector 7 always abuts against the annular surface 4. There is only one common connector 7 and its lower end is in sealed contact with the annular surface 4.

[0033] The rotation of motor 3 drives the upper plate 2 to rotate around the center line, thereby precisely bringing the common connector 7 to the corresponding tap 6, achieving communication between the connecting hole 8 and the through hole 5. When wear occurs at the contact point between the common connector 7 and the annular surface 4, the elastic structure ensures that the common connector 7 remains pressed against the annular surface 4, improving sealing. Motor 3 is a servo motor, which enables precise positioning with a repeatability accuracy of 0.006.

[0034] like Figure 3As shown, 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 inside the limit plug 10. The common connector 7 is slidably fitted in the guide hole 11. An elastic structure is provided between the limit plug 10 and the common connector 7.

[0035] The common connector 7 is cylindrical and slides within the guide hole 11. The connecting hole 8 is coaxially connected through the common connector 7. The elastic structure acts on the common connector 7, causing the common connector 7 to tend to move towards the annular surface 4, ensuring that the common connector 7 always abuts against the annular surface 4.

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

[0037] Spring 13 is in a compressed state, and under the action of the elastic force of spring 13, the common connector 7 is always pressed against the annular surface 4. The limiting plug 10 is threaded into the mounting hole 9. During installation, first insert the common connector 7 into the mounting hole 9, then put the spring 13 onto the common connector 7, then put the limiting plug 10 onto the common connector 7, and finally thread the common connector 7 into the mounting hole 9.

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

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

[0040] like Figure 4 As shown, the lower end of the common connector 7 is provided with a second annular groove, and a second O-ring 15 is provided in the second annular groove. The second O-ring 15 not only ensures the sealing of the mounting cavity, but also improves the stability of the common connector 7.

[0041] like Figure 4 As shown, a limiting step 16 is provided at the lower part of the mounting hole 9. The outer diameter of the limiting stop 12 is larger than the inner diameter of the limiting step 16, which can effectively prevent the common connector 7 from coming out of the mounting hole 9.

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

[0043] like Figure 1-3 As shown, the lower plate 1 is equipped with a limiting bracket 21, and the upper plate 2 is equipped with a limiting block 22, which can abut against the limiting bracket 21. The limiting bracket 21 limits the limiting block 22, thereby achieving the purpose of circumferentially limiting the upper plate 2 and preventing the upper plate 2 from rotating more than 360°. When the limiting block 22 abuts against the limiting bracket 21, the common connector 7 is connected to one of the branch connectors 6 or the waste liquid connector 20.

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A multi-channel rotary switching valve, characterized in that, It includes a lower plate (1), an upper plate (2) rotatably mounted 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 several through holes (5) circumferentially distributed along the rotation center line of the upper plate (2). Each through hole (5) is equipped with a tap (6). The upper plate (2) 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 is provided between the upper plate (2) and the common connector (7) to ensure that the common connector (7) always abuts against the annular surface (4).

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 connector (7) is slidably fitted in the guide hole (11). The elastic structure is provided between the limit plug (10) and the common connector (7).

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

4. The multi-channel rotary switching valve according to claim 1, characterized in that, The lower end of the common connector (7) is provided with a first annular groove surrounding 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, The lower end of the common connector (7) is provided with a second annular groove, 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, The lower part of the mounting hole (9) is provided with a limiting step (16), and the outer diameter of the limiting stop (12) is larger 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 bottom of the annular cavity (17), the upper plate (2) is provided with an annular protrusion (18) extending into the annular cavity (17), and the common connector (7) is provided in the annular protrusion (18).

8. The multi-channel rotary switching valve according to claim 7, characterized in that, The bottom of the annular cavity (17) is also provided with an inlet hole and an outlet hole. A cleaning connector (19) is provided at the inlet hole, and a waste liquid connector (20) is provided at the outlet hole. The inlet hole and the outlet hole 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 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 limiting bracket (21), and the upper plate (2) is provided with a limiting block (22). The limiting block (22) can abut against the limiting bracket (21).

Images