CN219388156U

CN219388156U - Roots type hydrogen circulating pump

Info

Publication number: CN219388156U
Application number: CN202320638644.8U
Authority: CN
Inventors: 吴隆发; 巫修海; 马云芳; 张凯翔; 周子淼; 吕科琦; 王志杭; 叶阳; 陈彪; 曹能
Original assignee: Taizhou Vocational and Technical College
Current assignee: Taizhou Vocational and Technical College
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-07-21
Anticipated expiration: 2033-03-28

Abstract

The utility model provides a Roots type hydrogen circulating pump, and belongs to the technical field of pumps. The system solves the problems that the existing Roots-type hydrogen circulating pump has large running noise and low gas conveying flow. The Roots type hydrogen circulating pump comprises a pump body with a rotor chamber and two identical rotors which are positioned in the rotor chamber, wherein the two rotors are arranged in parallel and can rotate along opposite directions, end surface molded lines of the two rotors are identical and are externally meshed, the rotors are provided with three tooth parts which are uniformly distributed around the circumference of an axial lead, the tooth parts divide the rotor chamber into a plurality of groups of circulating cavities, and the end surface molded lines of each tooth part are formed by convex arc sections, involute sections and concave curve sections which are sequentially connected from tooth tops to tooth roots. The Roots type hydrogen circulating pump has the advantages of reducing the end surface area of the tooth part, increasing the volume of the circulating cavity, further improving the volumetric efficiency and the gas passing efficiency of the circulating pump, along with small noise, less backflow and low energy consumption.

Description

Roots type hydrogen circulating pump

Technical Field

The utility model belongs to the technical field of pumps, and relates to a circulating pump, in particular to a Roots type hydrogen circulating pump.

Background

The Roots pump is characterized by quick start, low power consumption, low operation and maintenance cost, high pumping speed and high efficiency, and the Roots structure is usually used on pump bodies such as vacuum pumps, circulating pumps, booster pumps and the like.

The Roots type circulating pump is a rotary positive displacement compressor and has the advantages of simple structure, strong bearing capacity, good wind-passing performance, low energy consumption, easy manufacture and the like, and the tooth rotor is used as an important part of the Roots type circulating pump and has great relation with the tightness, gas leakage and efficiency performance of the circulating pump, so that the meshing performance between the two rotors needs to be improved, the rotor molded line transition is smooth, and the meshing tightness is high.

Chinese patent (application number: 202020947523.8) discloses a three-lobe rotor of roots type hydrogen circulation pump, which comprises three tooth parts symmetrically distributed with the axis of the rotor, wherein the engagement profile of the first side of each tooth part comprises a convex arc section AB, an involute section BC, a transition arc CD and a concave arc DE which are sequentially connected, the engagement profile of the second side of each tooth part is obtained by mirroring the engagement profile of the first side, and the connection parts among the curves are all in smooth transition. The three-blade rotor of the scheme has good meshing performance, can reduce leakage quantity, and meets the requirement of meshing performance between the rotors. The Roots-type hydrogen circulation pump is generally suitable for use in relatively stable conditions, such as biological laboratories and space stations.

The hydrogen fuel cells are increasingly used in passenger vehicles, and the working conditions of the passenger vehicles are more complex, such as the air pressure, the air delivery flow and the output power change range are larger, so that those skilled in the art want to be able to propose a Roots type hydrogen circulating pump which meets the requirements of the hydrogen fuel cells of the passenger vehicles. Noise reduction can improve the comfort of use of the passenger car, and thus, it is desirable for those skilled in the art to be able to reduce noise generated when the Roots-type hydrogen circulation pump is used.

Disclosure of Invention

The utility model provides a Roots type hydrogen circulating pump, which aims to solve the technical problem of improving the gas conveying flow of the Roots type hydrogen circulating pump and maximally reducing the running noise of the Roots type hydrogen circulating pump.

The technical problems to be solved by the utility model can be realized by the following technical proposal: the Roots type hydrogen circulating pump comprises a pump body with a rotor chamber and two identical rotors which are positioned in the rotor chamber, wherein the two rotors are arranged in parallel and can rotate in opposite directions, end surface molded lines of the two rotors are identical and are externally meshed, the rotors are provided with three tooth parts which are uniformly distributed around the axial lead in the circumferential direction, the tooth parts divide the rotor chamber into a plurality of groups of circulating cavities, and an air inlet and an air outlet which are communicated with at least one group of circulating cavities are arranged on the pump body; the end surface molded line of one side surface of each tooth part consists of a convex arc section, an involute section and a concave curve section which are connected in sequence; when the rotor rotates from the conjugate state of the point C of the involute BC on one rotor tooth part and the point B 'of the involute B' C 'on the other rotor tooth part to the conjugate state of the point B of the involute BC on one rotor tooth part and the point C' of the involute B 'C' on the other rotor tooth part, the rotor rotation angle is 80-85 degrees.

The end surface molded line of one side surface of the tooth part in the Roots type hydrogen circulating pump consists of three sections of arcs. Compared with the prior art, the involute section in the tooth part end surface molded line in the Roots type hydrogen circulating pump is longer, so that the tooth part has longer visual angle effect, and the volume of a circulation cavity in the Roots type hydrogen circulating pump is increased, thereby improving the gas suction amount and the gas discharge amount, and realizing the improvement of the gas conveying flow.

Preferably, the teeth are disposed helically about the axis of the rotors, and during rotation and engagement of the two rotors, the tip and root regions of the rotors do not form small seal dead zones, the gas is not compressed and expanded in such zones, thereby avoiding the generation of unnecessary noise and reducing the ability to consume compressed gas.

Preferably, the number of turns of the teeth is 0.04-0.11; the spiral angle of the tooth part is 8-30 degrees.

Preferably, the convex arc section of the tooth end surface molded line of one rotor and the concave curve section of the tooth end surface molded line of the other rotor are conjugate curves.

Preferably, the involute section, the convex arc section and the concave curve section in the end surface molded line of the tooth part are in smooth transition.

Preferably, the tooth part is provided with a central line passing through the vertex of the tooth part and the axis of the rotor, and the center of the convex arc section AB is positioned on the central line. The radius of the convex arc section AB is r1, the axle center distance between the two rotors is M, and the ratio of r1 to M is 0.07-0.13. The distance between the center of the convex arc section AB and the axis of the rotor is N, and the ratio of N to the axis distance M between the two rotors is 0.58-0.66. The central angle of the convex arc section AB is 34 degrees to 40 degrees.

Compared with the prior art, the end surface molded line of one side surface of each rotor tooth part of the Roots type hydrogen circulating pump consists of a convex arc section, an involute section and a concave curve section which are sequentially connected, the height of the tooth part is improved by prolonging the length of the involute section, the width of the tooth part is reduced, the end surface area of the tooth part is reduced, the volume of a circulating cavity is increased, and the volumetric efficiency and the gas passing efficiency of the circulating pump are further improved. The Roots type hydrogen circulating pump has the advantages of small noise, less backflow and low energy consumption during operation.

Drawings

Fig. 1 is a sectional view of a roots-type hydrogen circulation pump.

Fig. 2 is a perspective view of a rotor of the roots-type hydrogen circulation pump.

Fig. 3 is a sectional view showing a rotor state of the roots-type hydrogen circulation pump.

Fig. 4 is a two-sectional view showing a rotor state of the roots-type hydrogen circulation pump.

Fig. 5 is a three-sectional view showing a rotor state of the roots-type hydrogen circulation pump.

Fig. 6 is a four-sectional view showing a rotor state of the roots-type hydrogen circulation pump.

The marks in the figure: 1. a pump body; 2. a rotor; 3. an air inlet; 4. an air outlet; 5. a flow-through chamber; 6. teeth.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1 to 6, a roots-type hydrogen circulation pump comprises a pump body 1 having a rotor 2 chamber and two identical rotors 2 positioned in the rotor 2 chamber, the two rotors 2 are arranged in parallel, the two rotors 2 are connected by a synchronous gear, and when one rotor 2 is driven by a motor, the two rotors 2 synchronously rotate in opposite directions.

The end surface molded lines of the two rotors 2 are identical and externally meshed, the rotors 2 are provided with three tooth parts 6 which are uniformly distributed around the axial lead in the circumferential direction, the axes of the two rotors 2 are X1 and X2 respectively, the tooth parts 6 divide the rotor 2 chamber into a plurality of groups of circulating cavities 5, and the pump body 1 is provided with an air inlet 3 and an air outlet 4.

The end surface molded line of each tooth part 6 is composed of a convex arc section, an involute section and a concave curve section which are sequentially connected from the tooth top to the tooth bottom. The end surface molded lines on one rotor 2 are called a convex arc section AB, an involute section BC and a concave curve section CD, and the end surface molded lines on the other rotor 2 are called a convex arc section A 'B', an involute section B 'C' and a concave curve section C 'D'.

The concave curve section is the conjugate curve of the convex arc section, namely the convex arc section AB is the conjugate curve of the concave curve section C 'D', the concave curve section CD is the conjugate curve of the convex arc section A 'B', and smooth transition is realized between the convex arc section and the involute section and between the involute section and the concave curve section, so that the meshing tightness between the two rotors 2 is improved.

As shown in fig. 4, the tooth portion 6 has a central line passing through the vertex of the tooth portion 6 and the axis of the rotor 2, the center of the convex arc section AB is located on the central line E1, the end surface molded line of the rotor 2 has three said central lines, the center of the concave curve section CD is located on the central line E2, the radius of the convex arc section AB is r1, the axial center distance between the two rotors 2 is M, the ratio of r1 to M is 0.07-0.13, and the ratio of r1 to M is 0.1 given in the specification. The distance between the center of the convex arc section AB and the axis of the rotor 2 is N, and the ratio of N to the axis distance M between the two rotors 2 is 0.58-0.66; the drawing of the specification shows that N is 0.62. The central angle of the convex arc section AB is 34-40 degrees, and the central angle is 37 degrees as shown in the attached drawing. Since the concave curve section is a conjugate curve of the convex curve section, the ratio of the axial center distance between the convex curve section and the two rotors 2 can be limited, the radius ratio of the concave curve section relative to the convex curve section can be limited, the circle centers of the convex curve section and the concave curve section are positioned on the central line of the rotors 2, the positions of the circle centers of the convex curve section and the concave curve section are further determined, the size ratio of the convex curve section and the concave curve section of the rotors 2 with different sizes is the same, and the ratio of the involute length to the end surface molded line of the tooth part 6 is further determined, so that the involute length is always kept longer relative to the whole end surface molded line.

When the end point C of the involute BC in the end surface molded line of one tooth portion 6 of one rotor 2 and the end point B ' of the involute B ' C in the end surface molded line of one tooth portion 6 of the other rotor 2 are in a conjugate state, and the end point B of the involute BC in the end surface molded line of one tooth portion 6 of one rotor 2 and the end point C ' of the involute B ' C ' in the end surface molded line of one tooth portion 6 of the other rotor 2 are in a conjugate state, the rotation angle of the rotor 2 is 80-85 degrees.

As shown in fig. 3 to 6, the rotor 2 rotates from a state in which the point C of the end point of the involute BC in the end surface profile of one tooth portion 6 of one rotor 2 is conjugate with the point B ' of the end point of the involute B ' C ' in the end surface profile of one tooth portion 6 of the other rotor 2 to a state in which the point B of the end point of the involute BC in the end surface profile of one tooth portion 6 of one rotor 2 is conjugate with the point C of the end point of the involute B ' C ' in the end surface profile of one tooth portion 6 of the other rotor 2. Fig. 3 illustrates that the point C of the end point of the involute BC in the end surface profile of one tooth portion 6 of one rotor 2 is in a conjugate state with the point B ' of the end point of the involute B ' C ' in the end surface profile of one tooth portion 6 of the other rotor 2; fig. 4 illustrates that after the rotor 2 rotates by a specific angle, a middle point of an involute BC of an end surface profile of one tooth portion 6 of one rotor 2 is in a conjugate state with a middle point of an involute BC of an end surface profile of one tooth portion 6 of the other rotor 2, and a vertex of an end surface profile of one tooth portion 6 of one rotor 2 is in a conjugate state with a lowest point of an end surface profile of one tooth portion 6 of the other rotor 2; fig. 5 illustrates that after the rotor 2 rotates by an arbitrary angle, a middle point of the involute BC of the end surface profile of one tooth portion 6 of one rotor 2 is in a conjugate state with a middle point of the involute BC of the end surface profile of one tooth portion 6 of the other rotor 2; fig. 6 illustrates that the rotor 2 rotates until the point B of the end point of the involute BC in the end surface profile of one tooth portion 6 of one rotor 2 is in a conjugate state with the point C of the end point of the involute B 'C' in the end surface profile of one tooth portion 6 of the other rotor 2. From the state shown in fig. 3, it is rotated by 83 ° in the direction indicated by the arrow to the state shown in fig. 6, and the angle can be measured with respect to the center line E1. The rotor 2 rotates from one end of the involute section to one end of the involute section of the other rotor 2 in a conjugate way to the other end of the involute section of the other rotor 2 in a conjugate way, and the fact that the length of the involute section is longer is further proved, and the length of the involute section can influence the size of a single tooth part 6, particularly the width of the tooth part 6, so that the volume of a circulation cavity 5 is larger, and the volumetric efficiency and the gas passing efficiency of the circulating pump are improved under the condition that the meshing performance between the rotors 2 is ensured.

In actual operation, as shown in fig. 6, the point B of the involute end point on one tooth portion 6 is not in contact with but is close to the point C 'of the end point on the other tooth portion 6, and similarly, as shown in fig. 3, the point C of the involute end point on one tooth portion 6 is not in contact with but is close to the point B' of the end point on the other tooth portion 6, and in the rotation process of the spiral rotor 2, a seal line is not formed in the tooth top area and the tooth root area of the rotor 2 in the axial direction, so that noise in a small closed area is avoided, backflow caused in each exhaust period is small, and energy consumption is reduced.

The spiral angle of the tooth part 6 in the rotor 2 is 8 degrees to 30 degrees, and the spiral turn number of the tooth part 6 is 0.04 to 0.11. The drawing of the specification gives a helix angle of 12 ° and a number of turns of the tooth 6 of 0.08. The overlooking projection views of the air inlet 3 and the air outlet 4 are all in horn shapes, the 18-shaped sharp angle positions of the pump body are reserved, the air suction and the air discharge are more sufficient, the air suction and air discharge efficiency is improved, the area of the air outlet 4 is not larger than the area of the air inlet 3, the inlet conductance of the rotor 2 is improved, the performance is improved during high-speed operation of the circulating pump, and the backflow problem is relieved.

Claims

1. The utility model provides a roots type hydrogen circulating pump, including the pump body (1) that has rotor (2) room and two the same rotors (2) that are located rotor (2) room, two rotor (2) parallel arrangement just can rotate along opposite direction, the terminal surface molded lines of two rotor (2) are the same and external engagement, rotor (2) have three tooth portion (6) of evenly distributed around the axial lead circumference, tooth portion (6) divide rotor (2) room into multiunit circulation chamber (5), be provided with air inlet (3) and gas outlet (4) on pump body (1); the tooth profile is characterized in that the end surface profile of each tooth part (6) is composed of a convex arc section, an involute section and a concave curve section which are sequentially connected from the tooth top to the tooth bottom; when the point C of the involute BC in the end surface molded line of one tooth part (6) of one rotor (2) and the point B 'of the involute B' C 'in the end surface molded line of one tooth part (6) of the other rotor (2) are in a conjugate state, and rotate to the point B of the involute BC in the end surface molded line of one tooth part (6) of one rotor (2) and the point C' of the involute B 'C' in the end surface molded line of one tooth part (6) of the other rotor (2) are in a conjugate state, the rotation angle of the rotor (2) is 80-85 degrees.

2. The roots-type hydrogen circulation pump according to claim 1, wherein the convex arc section in the end surface profile of one tooth (6) of one rotor (2) and the concave curve section in the end surface profile of one tooth (6) of the other rotor (2) are conjugate curves.

3. The roots-type hydrogen circulation pump according to claim 1, wherein the tooth portion (6) has a center line passing through the apex of the tooth portion (6) and the axial center of the rotor (2), and the center of the convex arc section AB is located on the center line.

4. A roots-type hydrogen circulation pump according to claim 3, wherein the radius of the convex arc section AB is r1, the axial distance between the two rotors (2) is M, and r1: M is 0.07-0.13.

5. The roots-type hydrogen circulation pump according to claim 4, wherein the distance between the center of the convex arc section AB and the axis of the rotor (2) is N, and the ratio of N to the axis distance M between the two rotors (2) is 0.58-0.66.

6. A roots-type hydrogen circulation pump according to claim 3, wherein the central angle of the convex arc section AB is 34 ° -40 °.

7. A roots-type hydrogen circulation pump according to any one of claims 1 to 6 wherein the profile of the end faces of the teeth (6) has smooth transitions between involute and convex and concave arcuate sections.

8. Roots-type hydrogen circulation pump according to any one of claims 1 to 6, characterized in that the teeth (6) are helically arranged with respect to the axis of the rotor (2), the number of turns of the teeth (6) being 0.04-0.11.

9. Roots-type hydrogen circulation pump according to claim 8, characterized in that the helix angle of the teeth (6) is 8 ° -30 °.