Pressure relief slip sheet and vacuum pump with pressure relief slip sheet

Abstract

The utility model provides a pressure relief slip sheet, which comprises a curved surface part and a pressure relief part, the curved surface part and the pressure relief part are respectively arranged on two opposite sides of the pressure relief slip sheet, a caulking groove part is arranged in the middle area of the pressure relief part along the length direction of the pressure relief slip sheet, and pressure relief blocks are symmetrically arranged on two sides of the caulking groove part along the width direction. The pressure relief block on the single side is smoothly connected with the edge of the caulking groove part, and the pressure relief sliding piece is not flush with the upper end or the lower end of the pressure relief part. The pressure relief scribing pieces are arranged at the two ends of the rotating sliding piece in the pump cavity, the pressure relief blocks are arranged on the sides, facing the rotor, of the pressure relief scribing pieces, and the pressure relief channels are formed through the gaps between the adjacent pressure relief blocks and the gaps between the pressure relief blocks and the edges of the upper side and the lower side of the pressure relief blocks. And the symmetrically-arranged pressure relief channels can ensure that the pressure relief conditions on the two sides of the rotor in the rotating process are consistent, and stable operation of the pump body is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to a pressure relief sliding vane and a vacuum pump with a pressure relief sliding vane. Background Art

[0002] A vacuum pump is a device that converts the mechanical energy of a prime mover into gas pressure energy and is a pneumatic generating device for compressed air. During the operation of a single-vane vacuum pump, the rotor drives the sliding vane to rotate. The volume of the air extraction area in the pump chamber increases, forming a negative pressure. The air in the outside atmosphere is drawn into the vacuum pump through the intake check valve. At the same time, the volume of the exhaust area decreases, the air pressure increases, and the compressed air and lubricating oil are discharged through the vacuum pump exhaust check valve.

[0003] However, when the vacuum pump is operating, when the rotational speed of the vacuum pump exceeds 3000 rpm, the traditional spiral curve type will greatly increase the impact on the sliding vane. At the same time, the strength of the sliding vane made of the traditional split PPS material is also difficult to meet the strength requirements at high rotational speeds. In extreme cases, it may cause the fracture of the sliding vane, resulting in the failure of the vacuum pump. In addition, in order to lubricate, seal, and dissipate heat, lubricating oil needs to be injected into the pump chamber. Then, this lubricating oil and the compressed air are discharged out of the pump together. The higher the rotational speed, the greater the demand for lubricating oil, resulting in a large amount of resource waste. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defects existing in the prior art. The utility model provides a pressure relief sliding vane and a vacuum pump with a pressure relief sliding vane to assist in completing the pressure relief process in the pump chamber.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a pressure relief sliding vane, characterized in that it includes a curved surface part and a pressure relief part. The curved surface part and the pressure relief part are respectively arranged on opposite sides of the pressure relief sliding vane. An embedding groove part is opened in the middle area of the pressure relief part along the length direction of the pressure relief sliding vane. Pressure relief blocks are symmetrically arranged on both sides in the width direction of the embedding groove part. The single-sided pressure relief block is smoothly connected with the edge of the embedding groove part and the pressure relief block is not flush with the upper end or the lower end of the pressure relief part.

[0006] Furthermore, the number of the single-sided pressure relief blocks is at least two, and a pressure relief channel is arranged between adjacent pressure relief blocks.

[0007] Furthermore, the pressure relief blocks arranged at the upper and lower edges of the pressure relief part are not flush with the upper end and the lower end of the pressure relief part.

[0008] Furthermore, a vacuum pump with a pressure relief sliding vane includes a pump body, a pump cover, and a rotor eccentrically arranged in a pump chamber formed by the pump body and the pump cover.

[0009] A radial through groove is provided on the rotor, a rotating sliding vane is assembled in the groove, pressure relief sliding vanes are arranged at both ends of the rotating sliding vane, the edge of the rotating sliding vane is embedded in the groove part, and the curved surface part of the pressure relief sliding vane abuts against the inner wall of the pump chamber.

[0010] Further, the profile of the pump chamber is elliptical, a fixed shaft seat is arranged on the rotor, and a fixed notch is arranged on the pump cover for accommodating the fixed shaft seat.

[0011] Compared with the prior art, the beneficial effects of the present utility model include: by arranging pressure relief blades at both ends of the rotating sliding vane in the pump chamber, pressure relief blocks are arranged on the side of the pressure relief blade facing the rotor, and pressure relief channels are formed through the gaps between adjacent pressure relief blocks and the gaps between the upper and lower edges of the pressure relief blocks. The symmetrically arranged pressure relief channels can ensure that the pressure relief conditions on both sides are the same during the rotation of the rotor, ensuring the stable operation of the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The disclosure of the present utility model will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present utility model. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0013] Figure 1 Schematically shows the inner structure of the pressure relief sliding vane;

[0014] Figure 2 Schematically shows the outer structure of the pressure relief sliding vane;

[0015] Figure 3 Schematically shows the internal structure of the vacuum pump with a pressure relief sliding vane;

[0016] Figure 4 Schematically shows the top view structure of the vacuum pump with a pressure relief sliding vane.

[0017] Reference numerals in the figures: 1 - pump body, 2 - pump cover, 3 - pump chamber, 4 - rotor, 5 - rotating sliding vane, 6 - pressure relief sliding vane, 7 - curved surface part, 8 - pressure relief part, 9 - groove part, 10 - pressure relief block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] It is easily understood that according to the technical solution of the present utility model, without changing the essence of the present utility model, those of ordinary skill in the art can propose various interchangeable structural ways and implementation ways. Therefore, the following detailed embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present utility model, and should not be regarded as the whole of the present utility model or as a limitation or restriction on the technical solution of the present utility model.

[0019] Figure 1 Schematically shows the inner structure of the pressure relief sliding vane; Figure 2 Schematically shows the outer structure of the pressure relief sliding vane. A pressure relief sliding vane is as Figure 1-2 shown, including a curved surface portion 7 and a pressure relief portion 8. The curved surface portion 7 and the pressure relief portion 8 are respectively arranged on opposite sides of the pressure relief sliding vane 6. An embedding groove portion 9 is formed in the middle area of the pressure relief portion 8 along the length direction of the pressure relief sliding vane 6. Pressure relief blocks 10 are symmetrically arranged on both sides in the width direction of the embedding groove portion 9. The pressure relief blocks 10 on one side are smoothly connected to the edge of the embedding groove and the pressure relief blocks 10 are not flush with the upper end or the lower end of the pressure relief portion 8, so that the pressure relief blocks 10 can be at least in a separated state from the upper end or the lower end of the pressure relief portion 8, thereby forming a pressure relief channel to complete the function of pressure relief.

[0020] In some embodiments, the number of the pressure relief blocks 10 arranged on one side of the aforementioned embedding groove portion 9 is at least two, and a pressure relief channel is arranged between adjacent pressure relief blocks 10. For example, when the number of the pressure relief blocks 10 on one side is 2, there should be at least one pressure relief channel arranged among the 2 pressure relief blocks 10 and at least one pressure relief channel arranged at the edge of the pressure relief block 10 far from the upper side edge or the lower side edge of the pressure relief portion 8. At this time, the number of the pressure relief channels should be exactly the same as the number of the pressure relief blocks 10.

[0021] In some other embodiments, the pressure relief blocks 10 arranged on the upper and lower edges of the pressure relief portion 8 are not flush with the upper edge and the lower edge of the pressure relief portion 8. For example, when the number of the pressure relief blocks 10 on one side is two, the pressure relief channels include 2 pressure relief blocks 10 and 3 pressure relief channels between the pressure relief blocks 10 and the upper edge and the lower edge of the pressure relief portion 8. At this time, the number of the pressure relief channels should be exactly 1 more than the number of the pressure relief blocks 10.

[0022] Figure 3 Schematically shows the internal structure of a vacuum pump with a pressure relief sliding vane; Figure 4 Schematically shows the top view structure of a vacuum pump with a pressure relief sliding vane. The following combines Figure 3-4 For a vacuum pump with a pressure relief sliding vane, it is described as follows. It includes a pump body 1, a pump cover 2, and a rotor 4 eccentrically arranged in a pump chamber 3 enclosed by the pump body 1 and the pump cover 2. A radially penetrating embedding groove is formed on the rotor 4, and a rotating sliding vane 5 is assembled in the embedding groove. Pressure relief sliding vanes 6 are arranged at both ends of the rotating sliding vane 5. The edge of the rotating sliding vane 5 is embedded in the embedding groove portion 9 of the pressure relief sliding vane 6, and the curved surface portion 7 of the pressure relief sliding vane 6 abuts against the inner wall of the pump chamber 3.

[0023] It should be noted that the profile of the aforementioned pump chamber 3 is elliptical. A fixed shaft seat is arranged on the rotor 4 for connecting a rotating shaft to drive the rotor 4 to rotate therein. A fixed notch is arranged on the pump cover 2 for accommodating the fixed shaft seat and facilitating the access of the rotating shaft.

[0024] By adding pressure relief sliders 6 to both ends of the rotating slider 5 and completing pressure relief through a number of pressure relief channels provided on the pressure relief sliders 6, the stable operation inside the pump body 1 is ensured.

[0025] The technical scope of the present utility model is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present utility model, and these deformations and modifications should all fall within the protection scope of the present utility model.

Claims

1. A pressure relief sliding vane, characterized in that, It includes a curved surface portion (7) and a pressure relief portion (8). The curved surface portion (7) and the pressure relief portion (8) are respectively arranged on opposite sides of the pressure relief sliding piece (6). An embedding groove portion (9) is formed in the middle region of the pressure relief portion (8) along the length direction of the pressure relief sliding piece (6). Pressure relief blocks (10) are symmetrically arranged on both sides in the width direction of the embedding groove portion (9). One-sided pressure relief block (10) is smoothly connected with the edge of the embedding groove portion (9) and the pressure relief block (10) is not flush with the upper end or the lower end of the pressure relief portion (8).

2. The pressure relief sliding vane according to claim 1, wherein The number of one-sided pressure relief blocks (10) is at least two, and a pressure relief channel is arranged between adjacent pressure relief blocks (10).

3. The pressure relief sliding vane according to claim 2, wherein The pressure relief blocks (10) arranged at the upper and lower edges of the pressure relief portion (8) are not flush with the upper end and the lower end of the pressure relief portion (8).

4. A vacuum pump with a pressure relief sliding piece, comprising a pump body (1), a pump cover (2), and a rotor (4) eccentrically arranged in a pump chamber (3) enclosed by the pump body (1) and the pump cover (2), characterized in that a radially penetrating embedding groove is formed on the rotor (4), a rotating sliding piece (5) is assembled in the embedding groove, pressure relief sliding pieces (6) as described in any one of claims 1-3 are arranged at both ends of the rotating sliding piece (5), the edge of the rotating sliding piece (5) is embedded in the embedding groove portion (9), and the curved surface portion (7) of the pressure relief sliding piece (6) abuts against the inner wall of the pump chamber (3).

5. The vacuum pump with a pressure relief slide vane according to claim 4, characterized in that, The profile line of the pump chamber (3) is elliptical. A fixed shaft seat is arranged on the rotor (4), and a fixed notch is arranged on the pump cover (2) for accommodating the fixed shaft seat.

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