Switching valve for mass spectrometer

Abstract

The utility model discloses a switching valve for a mass spectrometer, which relates to the technical field of mass spectrometers and comprises a shell, a valve body, a valve core and a servo motor are arranged in the shell, and the valve core is connected with the servo motor through an auxiliary positioning component; the auxiliary positioning assembly comprises a transmission seat, a circumferential positioning pin, a turning transmission disc, a transmission shaft, a torsion spring and a connecting rod, a shaft hole is formed in the transmission seat, and the turning transmission disc is rotationally arranged in the shaft hole; a plurality of wedge-shaped blocks with inclined tops are arranged on the turning transmission disc, a push rod in contact with the tops of the wedge-shaped blocks is arranged on the side face of the transmission shaft, a reset spring is arranged in the shaft hole, and the transmission seat is connected with the transmission shaft through a torsional spring; a guide hole communicated with the shaft hole is formed in the side face of the transmission seat, the circumferential positioning pin is slidably connected with the guide hole in an inserted mode, the two ends of the connecting rod are hinged to the turning transmission disc and the circumferential positioning pin respectively, and a plurality of pin holes allowing the circumferential positioning pin to be connected in an inserted mode are formed in the inner wall of the shell so that it can be guaranteed that the valve element can be accurately positioned.

Description

Technical Field

[0001] The utility model relates to the technical field of mass spectrometers, in particular to a switching valve for a mass spectrometer. Background Art

[0002] A mass spectrometer, also known as a mass spectrometer, is an instrument for separating and detecting different isotopes. It is a type of instrument that separates and detects the composition of matter based on the principle that charged particles can be deflected in an electromagnetic field and the mass differences of the atoms, molecules or molecular fragments of the matter. The switching valve is an important component of the mass spectrometer.

[0003] The switching valve of the mass spectrometer is usually four-channel and six-channel, and its valve core is driven to rotate by a servo motor so that the channels in the valve core are aligned and connected with multiple output holes on the valve body to achieve switching.

[0004] Although servo motors can achieve relatively high precision at this stage, due to the influence of instrument vibration and the degradation of servo motor performance, the rotation angle error of the valve core increases, resulting in a decrease in the alignment accuracy between the channel inside the valve core and the output hole on the valve body, which has a negative impact on the detection accuracy of the mass spectrometer. Utility Model Content

[0005] The utility model aims to provide a switching valve for a mass spectrometer to solve the above technical problems.

[0006] Based on the above purpose, the utility model provides a switching valve for a mass spectrometer, comprising a housing, a valve body, a valve core rotatably arranged in the valve body, and a servo motor for driving the valve core to rotate, wherein the valve core is connected to the valve body through an auxiliary positioning component;

[0007] The auxiliary positioning assembly includes a transmission seat, a circumferential positioning pin, a direction-changing transmission disc, a transmission shaft, a torsion spring and a connecting rod. The transmission seat is provided with an axial hole, the direction-changing transmission disc is rotatably arranged in the axial hole, one end of the transmission shaft is connected to the servo motor, and the other end is plugged into the axial hole;

[0008] A plurality of wedge-shaped blocks with inclined tops are arranged on the direction-changing transmission disc around the transmission shaft, a push rod in contact with the top of the wedge-shaped block is arranged on the side of the transmission shaft, a return spring for pushing the direction-changing transmission disc toward the transmission shaft is arranged in the shaft hole, and the transmission seat is connected to the transmission shaft through a torsion spring;

[0009] A guide hole connected to the shaft hole is arranged on the side of the transmission seat, the circumferential positioning pin is slidably plugged into the guide hole, the two ends of the connecting rod are respectively hinged to the direction-changing transmission plate and the circumferential positioning pin, and a plurality of pin holes for the circumferential positioning pin to be plugged into are arranged on the inner wall of the shell.

[0010] Furthermore, the valve body is provided with a mounting cavity for the valve core to rotate, the valve core is provided with a direction-changing channel penetrating the same end thereof, and the input end of the direction-changing channel is located on the rotation axis of the valve core;

[0011] The valve body is provided with an input hole connected with the input end of the change-direction channel, and a plurality of output holes arranged around the input hole. The output end of the change-direction channel can be connected with the plurality of input holes in sequence by means of the rotation of the valve core.

[0012] Furthermore, the number of the input holes is the same as the number of the pin holes and the wedge-shaped blocks.

[0013] Furthermore, inclined surfaces are provided on both sides of one end of the circumferential positioning pin in the circumferential direction of the transmission shaft.

[0014] Furthermore, an annular positioning ring is arranged on the inner wall of the shell, the transmission seat is rotatably plugged with the positioning ring, and the pin hole is arranged on the inner wall of the positioning ring.

[0015] Furthermore, a plurality of circumferential positioning pins are arranged around the transmission shaft.

[0016] Beneficial effects of the utility model:

[0017] The utility model connects the valve core with the servo motor through an auxiliary positioning component. When the transmission shaft of the auxiliary positioning component is driven to rotate by the servo motor, the torsion spring connecting the transmission shaft and the transmission seat stores energy. While the transmission shaft rotates, the cooperation of the thrust rod and the wedge block is used to push the axial movement of the change-direction transmission disk provided with the wedge block, thereby driving the connecting rod to pull the circumferential positioning pin out of the pin hole, so that the transmission seat and the valve core rotate under the drive of the torsion spring. When the push rod moves to the next wedge block, the circumferential positioning pin is pushed out, so that the circumferential positioning pin can be inserted into the next pin hole as the transmission seat rotates, thereby realizing accurate positioning of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the auxiliary positioning component of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the valve body of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the valve core of the utility model;

[0024] Figure 6 It is a cross-sectional view of the valve core of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the transmission seat of the utility model;

[0026] Figure 8 It is a structural schematic diagram of the direction-changing transmission disc of the utility model;

[0027] Fig. 9 It is a structural schematic diagram of the positioning ring of the utility model.

[0028] The numbers in the figure are:

[0029] 1-housing; 2-valve body; 3-valve core; 4-servo motor; 5-transmission seat; 6-circumferential positioning pin; 7-direction transmission plate; 8-transmission shaft; 9-torsion spring; 10-connecting rod; 11-shaft hole; 12-wedge block; 13-push rod; 14-reset spring; 15-guide hole; 16-pin hole; 17-installation cavity; 18-positioning ring;

[0030] 201-input hole; 202-output hole;

[0031] 301-Change direction channel. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0033] like Figures 1 to 9 As shown, a switching valve for a mass spectrometer comprises a housing 1, a valve body 2, a valve core 3 rotatably disposed in the valve body 2, and a servo motor 4 for driving the valve core 3 to rotate, wherein the valve core 3 is connected to the valve body 2 through an auxiliary positioning assembly;

[0034] The auxiliary positioning assembly includes a transmission seat 5, a circumferential positioning pin 6, a direction-changing transmission disc 7, a transmission shaft 8, a torsion spring 9 and a connecting rod 10. The transmission seat 5 is provided with an axial hole 11, and the direction-changing transmission disc 7 is rotatably arranged in the axial hole 11. One end of the transmission shaft 8 is connected to the servo motor 4, and the other end is plugged into the axial hole 11.

[0035] A plurality of wedge-shaped blocks 12 with inclined tops are arranged on the direction-changing transmission plate 7 around the transmission shaft 8, a push rod 13 in contact with the top of the wedge-shaped block 12 is arranged on the side of the transmission shaft 8, a return spring 14 for pushing the direction-changing transmission plate 7 toward the transmission shaft 8 is arranged in the shaft hole 11, and the transmission seat 5 is connected to the transmission shaft 8 through a torsion spring 9;

[0036] A guide hole 15 connected to the shaft hole 11 is provided on the side of the transmission seat 5, and the circumferential positioning pin 6 is slidably plugged into the guide hole 15. The two ends of the connecting rod 10 are respectively hinged to the change-of-direction transmission plate 7 and the circumferential positioning pin 6. A plurality of pin holes 16 for the circumferential positioning pin 6 to be plugged into are provided on the inner wall of the outer shell 1.

[0037] The valve body 2 is provided with a mounting cavity 17 for the valve core 3 to rotate, and the valve core 3 is provided with a direction-changing channel 301 running through the same end thereof, and the input end of the direction-changing channel 301 is located on the rotation axis of the valve core 3;

[0038] The valve body 2 is provided with an input hole 201 connected to the input end of the change-direction channel 301 , and a plurality of output holes 202 arranged around the input hole 201 . The output end of the change-direction channel 301 can be connected to the plurality of input holes 201 in sequence by means of the rotation of the valve core 3 .

[0039] The number of input holes 201 is the same as the number of pin holes 16 and wedge blocks 12 , that is, each time the circumferential positioning pin 6 switches to be plugged into the next pin hole 16 , the output end of the change-direction channel 301 is aligned with the next output hole 202 .

[0040] Specifically, when the servo motor 4 drives the transmission shaft 8 to rotate, the push rod 13 on the side of the transmission shaft 8 moves upward along the inclined surface of the wedge-shaped block 12, thereby pushing the direction-changing transmission plate 7 to move downward, further compressing the reset spring 14, and pulling the circumferential transmission pin through the connecting rod 10, so that the circumferential transmission shaft 8 slides into the shaft hole 11, so that the circumferential transmission pin is separated from the pin hole 16 on the inner wall of the housing 1, so as to unlock the transmission seat 5. While the transmission seat 5 is locked, because the transmission seat 5 cannot rotate, the torsion spring 9 accumulates energy with the rotation of the transmission shaft 8 until the transmission seat 5 is unlocked, and the torsion spring 9 drives the transmission shaft 8 and the valve core 3 to rotate using the accumulated elastic potential energy.

[0041] In the process of the transmission seat 5 driving the valve core 3 to rotate, the push rod 13 moves to the next wedge block 12. Under the action of the reset spring 14, the direction-changing transmission disk 7 is reset, and the circumferential limit pin is driven to move out of the shaft hole 11 through the connecting rod 10. When the circumferential limit pin is aligned with the next pin hole 16 due to the transmission of the transmission seat 5, it is inserted into the next pin hole 16 under the thrust provided by the reset spring 14, thereby realizing the positioning of the transmission seat 5 and the valve core 3.

[0042] Furthermore, since the circumferential positioning pin 6 and the pin hole 16 are used for auxiliary positioning, when the rotation angle of the servo motor 4 increases, the valve core 3 will still accurately rotate to the preset angle under the cooperation of the circumferential positioning pin 6 and the pin hole 16. Therefore, the servo motor 4 can use the method of excessively driving the transmission shaft 8 to rotate, so as to ensure that the valve core 3 can always rotate at the preset angle, thereby realizing the accurate switching of the switching valve, that is, the output end of the change-direction channel 301 can be accurately aligned with the output hole 202. When the circumferential positioning pin 6 is plugged into the pin hole 16 and the servo motor 4 is powered off, the unreleased elastic potential energy of the torsion spring 9 will drive the transmission shaft 8 to rotate in the opposite direction, thereby ensuring the control accuracy of the servo motor 4.

[0043] The utility model connects the valve core 3 with the servo motor 4 through an auxiliary positioning component. When the transmission shaft 8 of the auxiliary positioning component is driven to rotate by the servo motor 4, the transmission seat 5 is locked by the circumferential positioning pin 6 plugged into the pin hole 16 on the housing 1, so that the torsion spring 9 connecting the transmission shaft 8 and the transmission seat 5 stores energy. While the transmission shaft 8 rotates, the axial movement of the change-direction transmission disk 7 provided with the wedge-shaped block 12 is promoted by the cooperation of the thrust rod and the wedge-shaped block 12, thereby driving the connecting rod 10 to pull the circumferential positioning pin 6 out of the pin hole 16, so that the transmission seat 5 and the valve core 3 are rotated under the drive of the torsion spring 9. When the push rod 13 moves to the next wedge-shaped block 12, the circumferential positioning pin 6 is pushed out, so that the circumferential positioning pin 6 can be inserted into the next pin hole 16 as the transmission seat 5 rotates, thereby realizing accurate positioning of the valve core 3.

[0044] Among them, inclined surfaces are provided on both sides of one end of the circumferential positioning pin 6 located in the circumferential direction of the transmission shaft 8 to facilitate the circumferential positioning pin 6 to be inserted into the pin hole 16 and to be disengaged from the pin hole 16 .

[0045] Among them, an annular positioning ring 18 is provided on the inner wall of the outer shell 1, the transmission seat 5 is rotatably plugged with the positioning ring 18, and the pin hole 16 is provided on the inner wall of the positioning ring 18. The positioning ring 18 is used to limit the transmission seat 5 to prevent the transmission seat 5 from lateral deviation, and it is also beneficial to reduce the length of the circumferential positioning pin 6 to prevent the circumferential positioning pin 6 from bending.

[0046] A plurality of circumferential positioning pins 6 are arranged around the transmission shaft 8 to facilitate uniform force on the direction-changing transmission disc 7 , to facilitate stable and reliable reciprocating sliding of the direction-changing transmission disc 7 in the shaft hole 11 , and to improve the reliability of locking the valve core 3 .

[0047] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A switching valve for a mass spectrometer, comprising a housing (1), a valve body (2) disposed in the housing (1), a valve core (3) rotatably disposed in the valve body (2), and a servo motor (4) for driving the valve core (3) to rotate, wherein: The valve core (3) is connected to the valve body (2) via an auxiliary positioning component; The auxiliary positioning assembly comprises a transmission seat (5), a circumferential positioning pin (6), a direction-changing transmission disc (7), a transmission shaft (8), a torsion spring (9) and a connecting rod (10); the transmission seat (5) is provided with an axial hole (11); the direction-changing transmission disc (7) is rotatably arranged in the axial hole (11); one end of the transmission shaft (8) is connected to the servo motor (4), and the other end is plugged into the axial hole (11); A plurality of wedge-shaped blocks (12) with inclined tops are arranged on the direction-changing transmission disk (7) around the transmission shaft (8); a push rod (13) in contact with the top of the wedge-shaped block (12) is arranged on the side of the transmission shaft (8); a return spring (14) for pushing the direction-changing transmission disk (7) toward the transmission shaft (8) is arranged in the shaft hole (11); and the transmission seat (5) is connected to the transmission shaft (8) via a torsion spring (9); A guide hole (15) communicating with the shaft hole (11) is provided on the side of the transmission seat (5); the circumferential positioning pin (6) is slidably plugged into the guide hole (15); two ends of the connecting rod (10) are respectively hinged to the direction-changing transmission plate (7) and the circumferential positioning pin (6); and a plurality of pin holes (16) for plugging the circumferential positioning pin (6) are provided on the inner wall of the housing (1).

2. A switching valve for a mass spectrometer according to claim 1, characterized in that: The valve body (2) is provided with a mounting cavity (17) for the valve core (3) to rotate, and the valve core (3) is provided with a direction-changing channel (301) penetrating the same end thereof, and the input end of the direction-changing channel (301) is located on the rotation axis of the valve core (3); The valve body (2) is provided with an input hole (201) connected to the input end of the direction-changing channel (301), and a plurality of output holes (202) arranged around the input hole (201); the output end of the direction-changing channel (301) can be connected to the plurality of input holes (201) in sequence by means of the rotation of the valve core (3).

3. A switching valve for a mass spectrometer according to claim 2, characterized in that: The number of the input holes (201) is the same as the number of the pin holes (16) and the wedge-shaped blocks (12).

4. A switching valve for a mass spectrometer according to claim 1, characterized in that: Inclined surfaces are provided on both sides of one end of the circumferential positioning pin (6) located in the circumferential direction of the transmission shaft (8).

5. The switching valve for a mass spectrometer according to claim 1, characterized in that: An annular positioning ring (18) is provided on the inner wall of the housing (1), the transmission seat (5) is rotatably plugged into the positioning ring (18), and the pin hole (16) is provided on the inner wall of the positioning ring (18).

6. The switching valve for a mass spectrometer according to claim 1, characterized in that: A plurality of circumferential positioning pins (6) are arranged around the transmission shaft (8).

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