Integrated end cover and liquid ring pump

Abstract

The utility model provides an integrated end cover and a liquid ring pump. The integrated end cover comprises an end cover body and an accommodating cavity which is concavely arranged from the inner side of the end cover body. The end cover body is provided with an exhaust channel, an air suction channel, a first airflow channel and a second airflow channel which communicate with the containing cavity. The first airflow channel is communicated with the second airflow channel, and an inlet of the first airflow channel and an outlet of the second airflow channel are both located between 121 and an outlet of the air suction channel. The first airflow channel is used for absorbing gas flowing through the inlet of the exhaust channel, and the second airflow channel is used for exhausting gas entering from the first airflow channel. Through the arrangement, gas which is not completely emptied at the exhaust channel can be further exhausted effectively, so that the gas is prevented from flowing from the high-pressure exhaust channel to the low-pressure suction channel, and the suction capacity of the next suction cycle is guaranteed.

Description

Technical Field

[0001] This application relates to the field of vacuum pumps, and particularly to an integrated end cover and a liquid ring pump. Background Art

[0002] With the rapid development of industrial technologies, various pump devices have become increasingly mature and are applied in a wider range of fields. As an important type of pump device, liquid ring pumps are widely used in many industrial fields such as petroleum, chemical industry, machinery, mining, light industry, medicine, and food. Since a liquid ring pump relies on the rotation of an impeller to transfer mechanical energy to the working liquid that plays an intermediate role, and then compresses the gas through the liquid ring to transfer energy to the gas, increasing its pressure to achieve the purpose of sucking vacuum, liquid ring pumps have always been highly regarded in the acquisition of rough vacuum.

[0003] The impeller of a liquid ring pump is in an eccentric position with the pump body, and the end is sealed by a side cover. The side cover end face is provided with an air inlet and an air outlet, which are respectively communicated with the inlet and outlet of the pump. When the pump body is filled with an appropriate amount of working liquid, due to the rotation of the impeller, the liquid is thrown out in all directions, forming a rotating liquid ring between the inner wall of the pump body and the impeller. The inner surface of the liquid ring, the surface of the impeller, and the side cover form a working cavity, and the impeller blades divide the cavity into several non-communicating closed cylinders. In the first half turn of the impeller (suction side), the volume of the closed cylinder gradually increases, and the gas is sucked into the closed cylinder through the air inlet; in the second half turn of the impeller (discharge side), the volume of the closed cylinder gradually decreases, the gas is compressed, the pressure increases, and then is discharged through the air outlet. However, for the liquid ring pumps on the current market, since the liquid ring between the trailing edge of the air outlet and the leading edge of the air inlet and the impeller hub cannot be completely fitted, leaving a radial gap, the gas cannot be completely emptied at the air outlet, and will flow from the high-pressure air outlet side to the low-pressure air inlet, thereby affecting the air intake volume of the next suction cycle.

[0004] Therefore, it is necessary to provide an improved integrated end cover to solve some or all of the above problems. Summary of the Utility Model

[0005] This application provides an integrated end cover and a liquid ring pump with a good suction cycle.

[0006] This application provides an integrated end cover, including an end cover body and a receiving cavity that is recessed inward from the inner side of the end cover body; the end cover body is provided with an exhaust passage, an air intake passage, a first air flow passage, and a second air flow passage that communicate with the receiving cavity;

[0007] The first air flow channel communicates with the second air flow channel, and the inlet of the first air flow channel and the outlet of the second air flow channel are both located between the inlet of the exhaust channel and the outlet of the suction channel; the first air flow channel is used to absorb the gas flowing through the inlet of the exhaust channel, and the second air flow channel is used to discharge the gas entering from the first air flow channel.

[0008] Further, the exhaust channel includes an inlet leading edge and an inlet trailing edge; the suction channel includes an outlet leading edge and an outlet trailing edge; the inlet of the first air flow channel is located between the inlet trailing edge and the outlet leading edge; the outlet of the second air flow channel is located between the inlet leading edge and the outlet trailing edge.

[0009] Further, along the direction perpendicular to the inner side of the end cover body, the inner side of the end cover body includes a circumferential surface covering the inlet of the exhaust channel and the outlet of the suction channel, and the inlet of the first air flow channel and the outlet of the second air flow channel do not extend beyond the circumferential surface.

[0010] Further, the end cover body is provided with a middle connection channel; the middle connection channel communicates between the first air flow channel and the second air flow channel; the diameter of the first air flow channel is smaller than the diameter of the second air flow channel.

[0011] Further, the end cover body includes a channel part; the channel part is arranged opposite to the inner side of the end cover body; at least the middle connection channel is arranged in the channel part.

[0012] The present application provides a liquid ring pump, which includes a pump body, an impeller and the integrated end cover as described above; the integrated end cover is fixed to the pump body, and the impeller is connected to the pump body; part of the impeller is located in the accommodation cavity, and the impeller can rotate relative to the integrated end cover.

[0013] Further, the impeller includes an impeller body and a plurality of blades arranged at intervals on the circumferential side of the impeller body, and an air chamber is formed between every two blades; the exhaust channel, the suction channel, the first air flow channel and the second air flow channel can all communicate with the air chamber.

[0014] Further, the exhaust channel includes an inlet leading edge and an inlet trailing edge; the suction channel includes an outlet leading edge and an outlet trailing edge; at least three air chambers are separated between the inlet leading edge and the outlet trailing edge; at least one air chamber is separated between the outlet of the second air flow channel and the inlet leading edge or the outlet trailing edge.

[0015] Further, there are at least three of the air chambers between the trailing edge of the inlet and the leading edge of the outlet; there is at least one of the air chambers between the inlet of the first air flow channel and the trailing edge of the inlet or the leading edge of the outlet.

[0016] Further, the inlet of the first air flow channel is at the connection between the impeller body and the blade, and is adjacent to the circumferential side of the impeller body.

[0017] Compared with the prior art, the integrated end cover of the present application can effectively reduce the volume of the end cover body by integrating the first air flow channel and the second air flow channel in the end cover body. When the gas rotates and flows in the accommodation cavity, the first air flow channel is used to absorb the gas flowing through the inlet of the exhaust channel, and the second air flow channel is used to discharge the gas entering from the first air flow channel into the accommodation cavity, which can effectively discharge the gas that is not completely emptied at the exhaust port to avoid the gas flowing from the high-pressure exhaust channel to the low-pressure suction channel, thereby ensuring the suction volume in the next suction cycle. And the second air flow channel can discharge the gas into the accommodation cavity, so that the gas is discharged from the exhaust channel again, thereby ensuring the overall gas volume of the suction cycle and improving the working efficiency of the liquid ring pump.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this specification. Description of the Drawings

[0019] The drawings here are incorporated into the specification and form a part of the specification, showing embodiments consistent with this specification, and are used together with the specification to explain the principles of this specification.

[0020] Figure 1 is a side view of the integrated end cover of the present application.

[0021] Figure 2 is Figure 1 a cross-sectional view of the integrated end cover along A-A in

[0022] Figure 3 is a perspective view of the integrated end cover of the present application.

[0023] Figure 4 is Figure 3 a perspective view of the integrated end cover in another perspective in

[0024] Figure 5 is a perspective view of the liquid ring pump of the present application.

[0025] Figure 6 is Figure 5 a side view of the liquid ring pump in

[0026] Figure 7 is Figure 6Cross-sectional view of the middle liquid ring pump along B-B.

[0027] Figure 8 is Figure 7 Stereogram of the middle liquid ring pump after sectioning.

[0028] Explanation of the reference numerals in the attached drawings: 1 - end cover body; 11 - inner side of the end cover body; 111 - circumferential surface; 112 - rotating hole; 12 - exhaust passage; 121 - inlet of the exhaust passage; 122 - leading edge of the inlet; 123 - trailing edge of the inlet; 13 - suction passage; 131 - outlet of the suction passage; 132 - leading edge of the outlet; 133 - trailing edge of the outlet; 14 - first air flow passage; 141 - inlet of the first air flow passage; 15 - second air flow passage; 151 - outlet of the second air flow passage; 16 - middle connection passage; 17 - passage part; 18 - intake pipe; 19 - exhaust pipe; 101 - mounting shell; 102 - cover; 2 - accommodation cavity; 3 - pump body; 4 - impeller; 41 - impeller body; 42 - blades; 43 - air chamber. Detailed implementation mode

[0029] Here, in combination with the attached drawings, the technical solutions in the embodiments (or "implementation modes") of the present application will be clearly and completely described. When the following description involves the attached drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0030] If there are terms related to directional indication or positional relationship in the embodiments of the present application (such as up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings); if this specific posture changes, then the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0031] As Figures 1 to 3 shown, the integrated end cover of the present application includes an end cover body 1 and an accommodation cavity 2 recessed from the inner side 11 of the end cover body 1. The end cover body 1 is provided with an exhaust passage 12, a suction passage 13, a first air flow passage 14, a second air flow passage 15, and a middle connection passage 16. The exhaust passage 12, the suction passage 13, the first air flow passage 14, and the second air flow passage 15 are all communicated with the accommodation cavity 2. With such a setting, the exhaust passage 12, the suction passage 13, the first air flow passage 14, the second air flow passage 15, and the middle connection passage 16 are integrated in the end cover body 1, which can effectively reduce the volume of the end cover body 1 and facilitate the gas in the accommodation cavity 2 to participate in the suction cycle.

[0032] The exhaust passage 12 is used to discharge the gas in the accommodation cavity 2 from the end cover body 1, the suction passage 13 is used to convey the gas into the accommodation cavity 2, the first air flow passage 14 is used to send the gas in the accommodation cavity 2 to the second air flow passage 15, and the second air flow passage 15 is used to convey the gas into the accommodation cavity 2 again.

[0033] The exhaust passage 12 and the suction passage 13 are arranged at intervals in the end cover body 1. The first air flow passage 14 and the second air flow passage 15 are arranged at intervals in the end cover body 1 and are connected through the middle connection passage 16. Both the first air flow passage 14 and the second air flow passage 15 are located between the exhaust passage 12 and the suction passage 13.

[0034] In one embodiment, the gas in the accommodation cavity 2 enters the exhaust passage 12 from the inlet 121 of the exhaust passage 12. The inlet 121 of the exhaust passage 12 is arranged on the bottom wall of the accommodation cavity 2, and a plurality of inlets 121 of the exhaust passage 12 are arranged and spaced from each other so that the exhaust passage 12 can discharge more gas. The exhaust passage 12 includes an inlet leading edge 122 and an inlet trailing edge 123. The gas in the accommodation cavity 2 flows from the inlet leading edge 122 to the inlet trailing edge 123.

[0035] The outside gas enters the accommodation cavity 2 from the outlet 131 of the suction passage 13. The outlet 131 of the suction passage 13 is arranged on the bottom wall of the accommodation cavity 2 and is spaced from the inlet 121 of the exhaust passage 12. The suction passage 13 includes an outlet leading edge 132 and an outlet trailing edge 133. From the outlet leading edge 132 to the outlet trailing edge 133, the size of the outlet 131 of the suction passage 13 gradually increases. It is arranged in this way to facilitate the entry of the outside gas into the accommodation cavity 2 and thus participate in the suction cycle in the accommodation cavity 2 more smoothly.

[0036] The inlet 141 of the first air flow passage 14 and the outlet 151 of the second air flow passage 15 are both located on the bottom wall of the accommodation cavity 2, and the inlet 141 of the first air flow passage 14 and the outlet 151 of the second air flow passage 15 are spaced from each other. The inlet 141 of the first air flow passage 14 and the outlet 151 of the second air flow passage 15 are both located between the inlet 121 of the exhaust passage 12 and the outlet 131 of the suction passage 13. Specifically, the inlet 141 of the first air flow passage 14 is located between the inlet trailing edge 123 and the outlet leading edge 132, and the outlet 151 of the second air flow passage 15 is located between the inlet leading edge 122 and the outlet trailing edge 133.

[0037] The outside gas enters the accommodation cavity 2 and rotates and flows from the outlet 131 of the suction passage 13 to the inlet 121 of the exhaust passage 12 and the inlet 141 of the first air flow passage 14 in sequence. The first air flow passage 14 is used to absorb the gas flowing through the inlet 121 of the exhaust passage 12, and the second air flow passage 15 is used to discharge the gas entering from the first air flow passage 14.

[0038] With such a setting, when the gas rotates and flows in the accommodation chamber 2, the gas that is not completely exhausted at the exhaust passage 12 can be effectively discharged further through the inlet 141 of the first air flow passage 14, so as to prevent the gas from flowing from the high-pressure exhaust passage 12 to the low-pressure suction passage 13, thereby ensuring the suction volume in the next suction cycle. And the second air flow passage 15 can discharge the gas into the accommodation chamber 2, so that the gas is discharged from the exhaust passage 12 again, thereby ensuring the overall gas volume of the suction cycle and improving the working efficiency of the liquid ring pump.

[0039] Along the direction perpendicular to the inner side 11 of the end cover body 1, the inner side 11 of the end cover body 1 includes the circumferential surface 111 that covers the inlet 121 of the exhaust passage 12 and the outlet 131 of the suction passage 13. Specifically, for the sake of clarity, a circumferential surface 111 is assumed from the inner side 11 of the end cover body 1, and the circumferential surface 111 at least covers the inlet 121 of the exhaust passage 12 and the outlet 131 of the suction passage 13, and the circumferential surface 111 is a virtual structure. Further, the circumferential surface 111 is centered on the rotating hole 112, and the rotating hole 112 is located in the central area between the inlet 121 of the exhaust passage 12, the outlet 131 of the suction passage 13, the inlet 141 of the first air flow passage 14, and the outlet 151 of the second air flow passage 15.

[0040] The inlet 141 of the first air flow passage 14 and the outlet 151 of the second air flow passage 15 do not extend beyond the circumferential surface 111. With such a setting, the first air flow passage 14 can absorb the gas that is not completely exhausted at the exhaust passage 12 more efficiently, and at the same time, the gas discharged from the second air flow passage 15 can more conveniently participate in the gas circulation process.

[0041] The middle connection passage 16 is located in the end cover body 1 and is connected between the first air flow passage 14 and the second air flow passage 15. The diameter of the first air flow passage 14 is smaller than the diameter of the second air flow passage 15. The diameter of the middle connection passage 16 is not less than the diameter of the first air flow passage 14 and not greater than the diameter of the second air flow passage 15. With such a setting, the gas flowing through the first air flow passage 14, the middle connection passage 16, and the second air flow passage 15 can be effectively depressurized, so that the high-pressure gas can be converted into low-pressure gas when discharged.

[0042] Further combined with Figure 4As shown, in one embodiment, the end cap body 1 includes a channel portion 17, an intake pipe 18, an exhaust pipe 19, a mounting shell 101, and a cover 102. The channel portion 17, the intake pipe 18, and the exhaust pipe 19 are all disposed opposite to the inner side 11 of the end cap body 1, and the channel portion 17 is located between the intake pipe 18 and the exhaust pipe 19. At least the middle connection channel 16 is provided in the channel portion 17. Further, a part of the first air flow channel 14 and a part of the second air flow channel 15 are provided in the channel portion 17. The mounting shell 101 and the cover 102 together enclose a part of the exhaust channel 12.

[0043] As Figures 5 to 7 shown, the present application also provides a liquid ring pump, including a pump body, an impeller, and the integrated end cap as described above. The integrated end cap is fixed to the pump body 3, and the impeller 4 is rotatably connected to the pump body 3. A part of the impeller 4 is located in the accommodation cavity 2, and the impeller 4 can rotate relative to the integrated end cap. The impeller 4 rotates around the rotation hole 112 as the center, thereby driving the gas to rotate, and the impeller 4 fits against the bottom wall of the accommodation cavity 2.

[0044] In one embodiment, the impeller 4 includes an impeller body 41 and a plurality of blades 42 spaced around the circumferential side of the impeller body 41. The inlet 121 of the exhaust channel 12, the outlet 131 of the suction channel 13, the inlet 141 of the first air flow channel 14, and the outlet 151 of the second air flow channel 15 are all spaced around the circumferential edge of the impeller body 41 at intervals. An air chamber 43 is formed between every two blades 42, and the exhaust channel 12, the suction channel 13, the first air flow channel 14, and the second air flow channel 15 can all communicate with the air chamber 43.

[0045] Further, the impeller body 41 covers a part of the inlet 121 of the exhaust channel 12 and a part of the outlet 131 of the suction channel 13. With such a setting, the impeller 4 can quickly drive the gas flowing out of the suction channel 13 to rotate and increase the pressure, and at the same time, the pressurized gas can be quickly discharged into the exhaust channel 12.

[0046] Further in combination with Figure 8 shown, there are at least three air chambers 43 between the inlet leading edge 122 and the outlet trailing edge 133. There is at least one air chamber 43 between the outlet 151 of the second air flow channel 15 and the inlet leading edge 122 or the outlet trailing edge 133. With such a setting, the air chamber 43 can be used to seal between the outlet 151 of the second air flow channel 15 and the exhaust channel 12 and the suction channel 13, so as to avoid the mutual disturbance of gases with different air pressures.

[0047] There are at least three air chambers 43 between the trailing edge 123 of the inlet and the leading edge 132 of the outlet. There is at least one air chamber 43 between the inlet 141 of the first air flow channel 14 and the trailing edge 123 of the inlet or the leading edge 132 of the outlet. With such an arrangement, the air chamber 43 can seal between the inlet 141 of the first air flow channel 14 and the exhaust channel 12 and the suction channel 13, avoiding the mutual disturbance of gases with different air pressures.

[0048] The inlet 141 of the first air flow channel 14 is located at the connection of the impeller body 41 and the blade 42 and is adjacent to the circumferential edge of the impeller body 41. With such an arrangement, the gas that is not completely emptied at the exhaust channel 12 can be more easily discharged through the inlet 141 of the first air flow channel 14, avoiding the gas flowing from the high-pressure exhaust channel 12 to the low-pressure suction channel 13, thereby ensuring the suction volume in the next suction cycle.

[0049] In the liquid ring pump of the present application, the external gas flows into the accommodation chamber 2 from the outlet 131 of the suction channel 13 through the inlet pipe 18, and the air chamber 43 that turns to the outlet 131 of the suction channel 13 will quickly carry the external gas to rotate, and the impeller 4 will compress the gas during the rotation. When the air chamber 43 carrying the compressed gas turns to the inlet 121 of the exhaust channel 12, the high-pressure compressed gas will be discharged from the liquid ring pump through the exhaust channel 12 and the exhaust pipe 19.

[0050] If the compressed gas is not completely emptied at the exhaust channel 12, the air chamber 43 of the impeller 4 will carry the remaining compressed gas to the inlet 141 of the first air flow channel 14, so as to empty the remaining compressed gas. The high-pressure gas entering the first air flow channel 14 will be transformed into low-pressure gas during the process of flowing through the middle connection channel 16 and the second air flow channel 15. Subsequently, the gas flowing out of the second air flow channel 15 will enter the air chamber 43 and finally be discharged into the exhaust channel 12 under the rotation of the impeller 4.

[0051] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. An integrated end cap, characterized in that: include: An end cover body and a receiving cavity which is concavely arranged on the inner side of the end cover body; the end cover body is provided with an exhaust passage, an air intake passage, a first air flow passage and a second air flow passage which are communicated with the receiving cavity; The first airflow channel is connected to the second airflow channel, and the inlet of the first airflow channel and the outlet of the second airflow channel are both located between the inlet of the exhaust channel and the outlet of the intake channel; the first airflow channel is used to absorb the gas after flowing through the inlet of the exhaust channel, and the second airflow channel is used to discharge the gas entering from the first airflow channel.

2. The integrated end cap according to claim 1, characterized in that: The exhaust channel includes an inlet leading edge and an inlet trailing edge; the intake channel includes an outlet leading edge and an outlet trailing edge; the inlet of the first airflow channel is located between the inlet trailing edge and the outlet leading edge; the outlet of the second airflow channel is located between the inlet leading edge and the outlet trailing edge.

3. The integrated end cap according to claim 1, characterized in that: Along a direction perpendicular to the inner side of the end cover body, the inner side of the end cover body includes a circumferential surface covering the inlet of the exhaust channel and the outlet of the intake channel, and the inlet of the first airflow channel and the outlet of the second airflow channel do not exceed the circumferential surface.

4. The integrated end cap according to claim 1, characterized in that: The end cover body is provided with a central connection channel; the central connection channel is connected between the first airflow channel and the second airflow channel; the diameter of the first airflow channel is smaller than the diameter of the second airflow channel.

5. The integrated end cap according to claim 4, characterized in that: The end cover body comprises a channel portion; the channel portion is arranged opposite to the inner side of the end cover body; at least the central channel is arranged in the channel portion.

6. A liquid ring pump, characterized in that: include: A pump body, an impeller and an integrated end cover as described in any one of claims 1 to 5; the integrated end cover is fixed to the pump body, and the impeller is rotatably connected to the pump body; part of the impeller is located in the accommodating cavity, and the impeller can rotate relative to the integrated end cover.

7. The liquid ring pump according to claim 6, characterized in that: The impeller includes an impeller body and a plurality of blades spaced apart around the impeller body, with an air chamber formed between every two blades; the exhaust channel, the intake channel, the first airflow channel and the second airflow channel can all be connected to the air chamber.

8. The liquid ring pump according to claim 7, characterized in that: The exhaust channel includes an inlet front edge and an inlet rear edge; the intake channel includes an outlet front edge and an outlet rear edge; there are at least three air chambers between the inlet front edge and the outlet rear edge; and there is at least one air chamber between the outlet of the second airflow channel and the inlet front edge or the outlet rear edge.

9. The liquid ring pump according to claim 8, characterized in that: There are at least three air chambers between the inlet trailing edge and the outlet leading edge; there is at least one air chamber between the inlet of the first airflow channel and the inlet trailing edge or the outlet leading edge.

10. The liquid ring pump according to claim 7, characterized in that: The inlet of the first air flow channel is located at the connection between the impeller body and the blades, and is close to the peripheral side of the impeller body.

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