Anti-creepage connection structure for mass spectrometer

Abstract

The utility model discloses an anti-creepage connecting structure for a mass spectrometer, which comprises an anti-creepage insulating part and a connecting unit for electrically connecting a high-voltage shielding wire with a target plate groove, and further comprises an anti-creepage unit for isolating the high-voltage shielding wire from the inner wall of a vacuum chamber, and at least one anti-creepage groove is formed in the circumferential surface along the circumferential direction of the circumferential surface. According to the utility model, the insulating part is of the disc-shaped structure and is provided with the anti-creepage groove, so that the length of an anti-creepage path is effectively increased, and the anti-creepage requirement of a high-voltage device in the mass spectrometer is further met; the anti-creepage unit provided by the utility model can protect the shell of the vacuum chamber from electric shock of a high-voltage shielding wire, and further improves the safety of equipment.

Description

Technical Field

[0001] The utility model relates to a mass spectrometer, in particular to an anti-creeping connection structure for a mass spectrometer. Background Art

[0002] A mass spectrometer, also known as a mass spectrometer, works by ionizing sample molecules using an ion source under high vacuum conditions. The ionized molecules then enter a mass analyzer under the action of an accelerating electric field. The mass analyzer separates ions of different masses entering simultaneously according to their mass-to-charge ratio. The separated ions enter an ion detector and, after processing, produce a mass spectrum. The accelerating electric field is typically implemented using a high voltage (typically up to 30 kV), which requires that the high-voltage end of the mass spectrometer avoid high-voltage discharge or breakdown to other components within the vacuum chamber. Currently, the high-voltage connection between the high-voltage line and the target slot within the vacuum chamber typically utilizes a peripheral insulating column, which has a short anti-creeping distance and cannot effectively prevent high-voltage creepage, resulting in the possibility of electric shock to the inner wall of the vacuum chamber. Summary of the Invention

[0003] In view of this, the utility model proposes an anti-creeping connection structure for a mass spectrometer, which realizes the reliable connection between the high-voltage shielding wire and the target slot, ensures the high-voltage anti-creeping distance, and protects the shell corresponding to the high-voltage shielding wire in the vacuum chamber from electric shock from the high-voltage shielding wire.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The anti-creeping connection structure for a mass spectrometer described in the present invention includes an anti-creeping insulating member and a connection unit that electrically connects the high-voltage shielding wire and the target plate slot. It also includes an anti-creeping unit that isolates the high-voltage shielding wire from the inner wall of the vacuum chamber. The insulating member is a disc-shaped structure having a circumferential surface with at least one anti-creeping groove formed along its circumference. The beneficial effects are as follows: the insulating member of the present invention is a disc-shaped structure and has an anti-creeping groove, which effectively increases the length of the anti-creeping path, thereby meeting the anti-creeping requirements of the high-voltage components in the mass spectrometer; the anti-creeping unit of the present invention can protect the housing of the vacuum chamber from electric shock from the high-voltage shielding wire, further improving the safety of the equipment.

[0006] Preferably, the connection unit includes an electrode post disposed on the free surface of the insulating member and a conductive rod fixedly connected to the electrode post. A crown spring is provided at the connection end of the high-voltage shielding wire, and the conductive rod is inserted into the crown spring. A conductive electrode is provided at one end of the target plate slot, and the conductive electrode is connected to the electrode post via a conductive tension spring. The beneficial effect is that the present invention secures the electrode post to the insulating post, not only achieving electrical connection between the high-voltage wire and the target plate slot, but also ensuring sufficient anti-creepage distance, reducing the impact of high voltage electricity on the housing.

[0007] More preferably, the insulating member has a mounting hole for the electrode column and a vent hole communicating with the vacuum chamber, wherein the mounting hole communicates with the vacuum chamber via the vent hole. This advantageously results in a cavity formed by the mounting hole after the electrode column is fully installed, effectively preventing the formation of a dead volume that would affect the evacuation of the vacuum chamber and ensuring the vacuum level of the vacuum chamber.

[0008] Preferably, the insulating member is a disc-shaped structure, the peripheral surface is a circumferential surface, and at least one anti-creeping groove is provided on the circumferential surface, which facilitates processing and reduces processing costs.

[0009] More preferably, the diameter of the circumferential surface of the insulating member is ≥20mm and its thickness is ≤8mm. This utility model increases the diameter of the insulating member and, in combination with the anti-creep groove, effectively ensures the length of the creepage path, effectively avoiding high-voltage creepage. It also greatly reduces the thickness of the insulating member, takes up less space, and facilitates installation and vacuuming.

[0010] In one embodiment of the present invention, the anti-creepage unit includes a first isolation slot and a second isolation slot defined in the inner wall. The insulating member is mounted in and outside the first isolation slot, and the second isolation slot corresponds to the high-voltage shielded wire. This advantageously extends the anti-creepage distance to a certain extent by utilizing the isolation slot defined in the inner wall of the mass spectrometer housing.

[0011] In another embodiment of the present invention, the anti-creepage unit includes an insulating plate disposed on the inner wall, corresponding to the high-voltage shielded wire. A slot is defined on the circumference of the insulating member to accommodate the insulating plate, with one end of the insulating plate inserted into the slot. The slot has a depth greater than that of the isolation slot. This advantageously protects the housing at the location corresponding to the high-voltage shielded wire and also extends the anti-creepage distance of the present invention, preventing the housing from being struck by high-voltage electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model in a mass spectrometer.

[0013] Figure 2 It is a schematic diagram of the connection between the tension spring and the target plate groove of the utility model.

[0014] Figure 3 This is a first schematic diagram of the anti-creeping unit described in the present invention.

[0015] Figure 4 It is a structural diagram of the present utility model.

[0016] Figure 5 yes Figure 4AA direction schematic diagram.

[0017] Figure 6 yes Figure 5 Enlarged schematic diagram of part D in the middle.

[0018] Figure 7 This is a first schematic diagram of the insulating disc of the present invention.

[0019] Figure 8 yes Figure 7 BB direction schematic diagram.

[0020] Figure 9 It is another schematic diagram of the present utility model.

[0021] Figure 10 yes Figure 9 Schematic diagram of the connection between the insulating disc and the insulating plate.

[0022] Figure 11 yes Figure 10 CC direction schematic diagram. DETAILED DESCRIPTION

[0023] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0024] It should be noted that, in the description of the present utility model, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0025] In the description of this utility model, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integral connection; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium, or it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood based on specific circumstances.

[0026] like Figure 1-2As shown, the utility model proposes an anti-creeping connection structure for a mass spectrometer, which includes an anti-creeping insulating member (i.e., an insulating disk 1), a connection unit that electrically connects the high-voltage shielding wire 2 and the target plate slot 3, and an anti-creeping unit that isolates the high-voltage shielding wire 2 from the inner wall of the vacuum chamber. The anti-creeping unit can effectively prevent discharge from the high-voltage shielding wire 2 to the inner wall; the insulating member is an insulating disk 1, and at least one anti-creeping groove 4 (annularly opened) is opened on its circumference, which can effectively increase the creepage distance.

[0027] In a preferred embodiment of the present invention, the insulating disk 1 is preferably a disc-shaped structure with an outer diameter of ≥20 mm and two or more anti-creeping grooves 4 on the circumference. This not only extends the creepage path so that the total length of the creepage path is more than 40 mm, meeting the anti-creeping requirements of the high-voltage line of the mass spectrometer, but also controls the thickness of the insulating disk 1 to within 8 mm, thus occupying a small space. Figure 7-8 Of course, the circumference of the insulating disk 1 can also be a polygonal structure or formed by connecting multiple arcs. The insulating disk of the present invention is not limited to a circular disk shape.

[0028] Combine Figure 1-2 and Figure 5-6 It can be seen that the connection unit includes an electrode column 5a arranged on the free surface of the insulating disk 1 (the electrode column 5a is threadedly connected to the insulating column) and a conductive rod 5b fixed to the electrode column 5a. The connection end of the high-voltage shielding wire 2 is provided with a crown spring 5c, and the conductive rod 5b is inserted into the crown spring 5c, which not only realizes the electrical connection between the high-voltage shielding wire 2 and the electrode column 5a, but also facilitates disassembly, maintenance or replacement; a conductive column is also coaxially welded on the electrode column 5a, and a conductive electrode is provided at one end of the target plate slot 3. The conductive electrode is connected to the conductive column through a tension spring 6 (made of metal and coated with insulating material), thereby realizing the electrical connection between the target plate slot 3 and the electrode column 5a, and further realizing the electrical connection between the high-voltage shielding wire 2 and the target plate slot 3.

[0029] Combine Figure 7-8 It can be seen that the insulating disk 1 has a mounting hole K1 that matches the electrode column 5a and a vent hole K2 that communicates with the vacuum chamber. The inner end of the vent hole K2 communicates with the mounting hole K1, thereby achieving communication between the mounting hole K1 and the vacuum chamber. During actual installation, after the electrode column 5a is installed in place, there is still a certain amount of margin in the mounting hole K1 to form a cavity K3 (see Figure 6 ), the air vent K2 connects the cavity K3 and the vacuum chamber to prevent the cavity K3 from forming a dead volume and affecting the vacuum pumping of the vacuum chamber, thereby further ensuring the vacuum degree of the vacuum chamber.

[0030] During actual installation, the mounting surface of the insulating disk 1 is provided with an insulating connector 1a, and the insulating disk 1 is fixed to the inner wall of the housing of the mass spectrometer (the housing is sealed to form a vacuum chamber) through the insulating connector 1a (having an external thread and screwed on the housing). The insulating disk 1 and the insulating connector 1a are preferably integrally formed of a high-pressure resistant polyether-based material.

[0031] In one embodiment of the present invention: Figure 3-5 It can be seen that the anti-creeping unit includes a first isolation groove 7a and a second isolation groove 7b opened on the inner wall. The first isolation groove 7a and the second isolation groove 7b are connected to each other. The first isolation groove 7a is an arc-shaped structure. The insulating disk 1 is coaxially installed on the inner wall corresponding to the first isolation groove 7a, and the insulating disk 1 is located outside the first isolation groove 7a. The first isolation groove 7a has a certain depth, which can provide a certain length of anti-creeping distance (the anti-creeping distance is above 40 mm), further reducing the thickness of the insulating disk 1 and reducing the installation space; the second isolation groove 7b is a square groove (of course it can also be an arc-shaped or other polygonal structure, etc.), and the second isolation groove 7b corresponds to a section of high-voltage shielded wire 2 in the vacuum chamber, which can effectively prevent the high-voltage shielded wire 2 from electric shocking the shell here due to high voltage, thereby further improving safety.

[0032] In another embodiment of the present invention: Figure 9-11 It can be seen that the anti-creepage unit includes an insulating plate 8 arranged on the inner wall (the insulating plate 8 is made of a high-voltage resistant polyether-based material and is fixed with an insulating hollow screw). The insulating plate 8 corresponds to the high-voltage shielding wire 2 to prevent the high-voltage shielding wire 2 from carrying high voltage and contacting the motor housing corresponding to it; a slot is provided on the circumference of the insulating disk 1 to cooperate with the insulating plate 8, and one end of the insulating plate 8 is inserted into the slot (the depth of the slot is greater than the depth of the isolation groove), effectively ensuring the creepage distance.

[0033] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anti-creeping connection structure for a mass spectrometer, comprising an anti-creeping insulating member and a connection unit for electrically connecting a high-voltage shielded wire and a target plate slot, characterized in that: It also includes an anti-creeping unit that isolates the high-voltage shielding line from the inner wall of the vacuum chamber. The insulating member is a disc-shaped structure having a circumferential surface. At least one anti-creeping groove is opened on the circumferential surface along its circumference.

2. The anti-creeping connection structure for a mass spectrometer according to claim 1, characterized in that: The connecting unit includes an electrode column arranged on the free surface of the insulating member and a conductive rod fixedly connected to the electrode column. The connecting end of the high-voltage shielding wire is provided with a crown spring, and the conductive rod is inserted into the crown spring; a conductive electrode is provided at one end of the target plate slot, and the conductive electrode is connected to the electrode column through a conductive tension spring.

3. The anti-creeping connection structure for a mass spectrometer according to claim 2, characterized in that: The insulating member is provided with a mounting hole matched with the electrode column and an air vent communicated with the vacuum chamber, and the mounting hole is communicated with the vacuum chamber through the air vent.

4. The anti-creeping connection structure for a mass spectrometer according to claim 1, characterized in that: The insulating member is a disc-shaped structure, the peripheral surface is a circumferential surface, and at least one anti-creeping groove is provided on the circumferential surface.

5. The anti-creeping connection structure for a mass spectrometer according to claim 3, characterized in that: The diameter of the peripheral surface of the insulating member is ≥20 mm, and the thickness thereof is ≤8 mm.

6. The anti-creeping connection structure for a mass spectrometer according to any one of claims 1 to 5, characterized in that: The anti-creeping unit includes a first isolation groove and a second isolation groove opened on the inner wall. The insulating member is installed at the first isolation groove and is located outside the first isolation groove. The second isolation groove corresponds to the high-voltage shielding wire.

7. The anti-creeping connection structure for a mass spectrometer according to any one of claims 1 to 5, characterized in that: The anti-creeping unit includes an insulating plate arranged on the inner wall, and the insulating plate corresponds to the high-voltage shielding line; a slot matching the insulating plate is opened on the circumference of the insulating member, and one end of the insulating plate is inserted into the slot.

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