Single-stage double-acting four-suction type liquid ring compressor

Abstract

The application belongs to the technical field of water ring compressors, and particularly relates to a single-stage double-acting four-suction liquid ring compressor, which comprises a pump shaft, an impeller, a pump body and left and right two end covers. The pump shaft penetrates through the pump body, and the impeller is arranged on the pump shaft. The impeller is located in the middle of the pump body and is tangent to the inner walls on both sides of the pump body. The impeller divides the oval pump cavity into two parts. A partition plate is arranged in the pump body, and the partition plate divides the pump cavity into two parts. The impeller and the partition plate jointly divide the oval pump cavity into two upper compression cavities and two lower compression cavities. Two layers of suction and exhaust passages are arranged on each end cover. The four compression cavities are independent of each other and are connected with the pump body gas inlet and the pump body gas outlet through the suction and exhaust holes on the adjacent end covers. The impeller sucks and exhausts gas once per revolution, each compression cavity sucks and exhausts gas once, the single-side pump cavity sucks and exhausts gas twice, and the four compression cavities can suck and exhaust gas four times, so that the efficiency is extremely high.

Description

TECHNICAL FIELD

[0001] The present application relates to a single-stage double-acting four-suction liquid ring compressor, belonging to the technical field of water ring compressors. BACKGROUND

[0002] Since the water ring compressor was invented, it has been widely used because of its simple structure, easy maintenance, small mechanical wear, long service life and large suction capacity. Generally, the compressor works by relying on the centrifugal force generated by the rotation of the eccentric impeller to drive the water ring to change the space in the pump body. The eccentric impeller uses sufficient water as the working fluid. When the impeller rotates, the water is thrown to the inner wall of the pump cavity by the impeller. Due to the centrifugal force, the water ring compressor forms a closed ring with approximately equal thickness, and the thickness depends on the shape of the pump cavity. The inner surface of the upper part of the water ring only contacts the top of the blade, while the inner surface of the bottom of the water ring is tangent to the pump shaft. At this time, a growing space is formed between the shaft of the water ring compressor and the water ring. This space is divided into several small cavities with the same number of blades by the impeller. If the starting point is 0°, the suction is completed before 180° of the impeller. When the impeller continues to rotate, the small cavity becomes smaller, and the gas is compressed. When the cavity is connected to the exhaust port, the gas is discharged from the pump.

[0003] However, the current water ring compressor is basically single-acting, that is, there is only one air inlet and one suction port, and there is only one eccentricity in the pump cavity. The suction and exhaust are completed once per revolution of the impeller, and the efficiency is low. Due to the existence of eccentricity, the structure of the pump cavity is not symmetrical, and the machining of the parts is relatively difficult, and the concentricity cannot be guaranteed. SUMMARY

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to overcome the deficiencies of the prior art and provide a single-stage double-acting four-suction liquid ring compressor. The compressor can obtain higher compression ratio and larger suction and exhaust capacity, and the structure is more compact and reasonable.

[0005] The single-stage double-acting four-suction liquid ring compressor according to the present application comprises a pump shaft, an impeller, a pump body and two left and right end covers. The pump shaft passes through the pump body, and the impeller is arranged on the pump shaft. The impeller is located in the middle of the pump body and is tangent to the inner walls on both sides of the pump body, and the impeller divides the elliptical pump cavity into upper and lower parts. A partition is arranged in the pump body, and the partition divides the pump cavity into left and right parts. The impeller and the partition together divide the elliptical pump cavity into two upper compression cavities and two lower compression cavities. Two pairs of suction and exhaust holes are arranged on each end cover. The four compression cavities are independent of each other and are connected to the pump body air inlet and pump body air outlet through the suction and exhaust holes on the adjacent end covers.

[0006] The pump cavity adopts two eccentric structures at the top and bottom, and a partition plate is arranged in the pump cavity, so that four independent compression cavities are formed. The impeller sucks and discharges air once per rotation, each compression cavity sucks and discharges air once, the single-side pump cavity sucks and discharges air twice, and the four compression cavities can suck and discharge air four times, so that the efficiency is extremely high.

[0007] The pump body is provided with air passages, the suction side air passage and the discharge side air passage are arranged on the front and rear sides of the pump cavity, and the pump inlet and the pump outlet are communicated with the end covers on the left and right sides through the suction side air passages and the discharge side air passages on the front and rear sides.

[0008] Further, two pairs of air suction and discharge holes are arranged on the end surface of the end cover connected with the pump body, i.e. an end cover first air inlet, an end cover first air outlet, an end cover second air inlet and an end cover second air outlet, the end cover first air inlet and the end cover second air inlet are communicated with the end cover air inlet, the end cover first air outlet and the end cover second air outlet are communicated with the end cover air outlet, the end cover air inlet and the end cover air outlet are connected with the suction side air passage and the discharge side air passage respectively, and the two air inlets and the two air outlets are cross-shaped and staggered.

[0009] The application also comprises two left and right distributors, the distributors are sleeved on the pump shaft, a distributor first air inlet, a distributor first air outlet, a distributor second air inlet and a distributor second air outlet are arranged around the outer surface of the distributor, the air inlets and air outlets of the distributor are communicated with the air inlets and air outlets of the end cover through the openings on the end surface of the distributor, the air inlets and air outlets of the distributor are communicated with the compression cavities, and the end cover is communicated with the compression cavities through the distributors.

[0010] The end cover is provided with a liquid supplementing port, the liquid supplementing port is communicated with the compression cavities, and the left and right end covers are also communicated through the communication pipe at the bottom of the pump body, so that the water ring compressor is supplied with water under pressure through the liquid supplementing port.

[0011] The partition plate comprises an impeller partition plate and a pump body partition plate, the pump body partition plates on the upper and lower sides form a circle matched with the outer diameter of the impeller, and cooperate with the middle partition plate of the impeller to divide the pump cavity into two cavities.

[0012] The outer surface of the distributor is cylindrical, and the inner surface of the distributor is conical, so that the distributor can be matched with the impeller, and the impeller and the pump shaft are not in contact and interference.

[0013] Preferably, the inner cone angle of the distributor is 8-10°.

[0014] The distributor is provided with a plurality of liquid supplementing holes, the liquid supplementing holes are communicated with the outer cylindrical surface and the inner conical surface of the distributor. Water can enter the gap in the pump body through the plurality of liquid supplementing holes, and the gap in the middle of the pump body is sealed by the water seal ring.

[0015] The single suction port of the distributor has an area greater than that of the single discharge port, so that the gas can be compressed twice during the flow in the single compression chamber.

[0016] The pump shaft of the application is provided with bearings at both ends, and adopts a rear bearing positioning mode, that is, a gap is left between the front end bearing and the gland, and the rear end bearing is tightly attached to the gland, so that the front bearing only serves as a support bearing, and the rear bearing serves as a support and positioning bearing.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] 1) The distributor adopts a conical structure design, the outer surface of the cone is a straight cylinder, and is in gap fit with the inner hole of the impeller, so that the gas can be collected through two large gas ports and compressed through two small gas ports to increase the gas flow rate, and the inside of each end cover is a double-layer gas flow channel, which is connected with two large conical ports and two small conical ports respectively, so that the collected gas can be sucked into the compressor at a higher flow rate, and the compression ratio can be effectively increased.

[0019] 2) The pump cavity adopts an upper and lower eccentric structure, and a partition plate is arranged in the middle of the pump cavity, which can cooperate with the impeller to divide the pump cavity into two compression chambers on the left and right sides, so that the left and right end covers can respectively suck and discharge twice, and the left and right end covers can suck and discharge four times, so that the compression efficiency is higher, and a higher compression ratio can be obtained.

[0020] 3) Since the water ring compressor is supplied with water under pressure, the water supply pressure is generally 0.3MPa, and the discharge side is 0.1MPa. The left and right end covers of the compressor are connected through a communication pipe, and during operation, the water flow rate is fast due to the pressure difference between the supply and discharge of the compressor, and the faster the flow rate, the lower the pressure, so that a certain vacuum is formed in the compression cavity, which is superimposed with the centrifugal force of the vacuum pump, so that a higher compression ratio is formed. Through this technology, due to the increase of the flow rate, the compressor can suck more gas in the same time, so that it is more efficient and energy-saving. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the application;

[0022] Figure 2 is a schematic diagram of the structure after hiding one end cover;

[0023] Figure 3 is a front view of the application;

[0024] Figure 4 is a sectional view in the front view direction of the application;

[0025] Figure 5 is a sectional view in the side view direction of the application;

[0026] Figure 6 is the structural diagram of the pump body;

[0027] Figure 7 is the overall structural diagram of the end cover;

[0028] Figure 8 is the internal structural diagram of the end cover;

[0029] Figure 9 is the structural diagram of the front face of the distributor;

[0030] Figure 10 is the structural diagram of the back face of the distributor;

[0031] Figure 11 is the sectional structural diagram of the distributor;

[0032] Figure 12 is the structural diagram of the impeller;

[0033] Figure 13 is the partial enlarged view of A part in Figure 4

[0034] is the partial enlarged view of B part in Figure 14 Figure 4

[0035] In the figure: pump shaft 1; impeller 2; pump body 3; distributor 4; end cover 5; liquid supplementing port 6; pump body air inlet 7; pump body air outlet 8; air passage 9; communication pipe 10; impeller partition plate 11; pump body partition plate 12; upper compression chamber 13; lower compression chamber 14; end cover air inlet 15; end cover air outlet 16; end cover first air suction port 17; end cover first air outlet 18; end cover second air suction port 19; end cover second air outlet 20; distributor first air suction port 21; distributor first air outlet 22; distributor second air suction port 23; distributor second air outlet 24; liquid supplementing hole 25; liquid inlet 26; bearing 27; gland 28. DETAILED DESCRIPTION

[0036] The present application will be further described in conjunction with specific examples. However, the purposes and objectives of these example embodiments are only used to exemplify the present application, and do not constitute any form of limitation on the actual protection scope of the present application, and do not limit the protection scope of the present application.

[0037] As Figures 1-5 ​​As shown, the single-stage double-acting four-suction liquid ring compressor of the present invention includes a pump shaft 1, an impeller 2, a pump body 3, and two end covers 5. The pump shaft 1 passes through the pump body 3, and the impeller 2 is mounted on the pump shaft 1. The impeller 2 is located in the middle of the pump body 3 and is tangent to the inner walls on both sides of the pump body 3. The impeller 2 divides the elliptical pump cavity into upper and lower parts. A partition is provided inside the pump body 3, which is perpendicular to the axis of the pump shaft 1. The partition divides the pump cavity into left and right parts. The impeller 2 and the partition together divide the elliptical pump cavity into two upper compression chambers 13 and two lower compression chambers 14. Each end cover 5 has two pairs of suction and exhaust holes. The four compression chambers are independent of each other and are all connected to the pump body inlet 7 and pump body outlet 8 through the suction and exhaust holes on adjacent end covers 5. Each compression chamber draws in and exhausts air once per revolution of the impeller 2, and each side of the pump cavity draws in and exhausts air twice. The four compression chambers can draw in and exhaust air four times.

[0038] The pump body 3 is equipped with an air passage 9, with the intake air passage and the discharge air passage located on the front and rear sides of the pump chamber, respectively. Figure 6 As shown. The pump body air inlet 7 and pump body air outlet 8 are connected to the left and right end caps through the suction side air passages on the front and rear sides and the discharge side air passages on the rear sides, respectively. Figure 2 As shown.

[0039] like Figure 7 , 8 As shown, the end cap 5 is provided with a first air intake 17, a first air outlet 18, a second air intake 19, and a second air outlet 20 on the end face where the end cap 5 is connected to the pump body 3. The first air intake 17 and the second air intake 19 are connected to the end cap inlet 15. The first air outlet 18 and the second air outlet 20 are connected to the end cap exhaust 16. The end cap inlet 15 and the end cap exhaust 16 are connected to the inhalation air passage and the exhaust air passage, respectively. The two air intakes and the two air outlets are arranged in a cross shape.

[0040] This embodiment also includes two distributors 4, one on the left and one on the right, which are sleeved on the pump shaft 1. Figure 9 , 10 As shown in Figure 11, a first air intake port 21, a first air outlet port 22, a second air intake port 23, and a second air outlet port 24 are provided around the outer side of the distributor 4. The air ports of the distributor 4 are connected to the air ports of the end cap 5 through the openings on the end face of the distributor. The air ports of the distributor 4 are connected to the compression chamber, and the end cap 5 is connected to the compression chamber through the distributor 4.

[0041] like Figure 4 As shown, the end cap 5 is provided with a liquid replenishment port 6, which is connected to the compression chamber; the left and right end caps 5 are also connected by a connecting pipe 10 at the bottom of the pump body 3. The liquid replenishment port is located at the bottom of the pump body, and can be used to replenish liquid from both the front and rear. When in use, one port is open and the other is closed.

[0042] As Figure 6 , 12 shown, the partition plate includes an impeller partition plate 11 and upper and lower pump body partition plates 12, the upper and lower pump body partition plates 12 form a circle matching the outer diameter of the impeller 2, and the partition plate can prevent gas from flowing between the two sides.

[0043] As Figure 9 , 10 , 11 shown, as a specific design of the present application, the outer side of the distributor 4 is cylindrical, the inner side of the distributor 4 is conical, the internal angle of the distributor 4 is 8-10°, which can be matched with the impeller 2, and the distributor 4, the pump shaft 1 do not contact and interfere with each other. The distributor 4 is provided with a plurality of liquid supplementing holes 25, the liquid supplementing holes 25 communicate the outer cylindrical surface and the inner conical surface of the distributor 4, water can enter the gap in the pump body through the plurality of liquid supplementing holes 25, and the gap in the middle of the pump body is sealed by the water seal ring. The area of a single air inlet of the distributor is greater than the area of a single air outlet, so that the gas can be compressed twice during the flow in a single compression chamber.

[0044] As Figure 13 , 14 shown, the pump shaft 1 is provided with bearings 27 at both ends, and a rear bearing positioning mode is adopted, that is, a gap is left between the front end bearing 27 and the gland 28, and the rear end bearing 27 is tightly attached to the gland 28. The front bearing only serves as a supporting bearing, and the rear bearing serves as a supporting and positioning bearing. The bearing of the embodiment adopts a deep groove ball bearing.

[0045] In order to facilitate understanding, the working principle of the embodiment is described as follows:

[0046] The gas is sucked by the pump body inlet 7 of the compressor, then passes through the suction side air duct 9, enters the left and right end cover inlet 15, and then passes through the end cover first air inlet 17 and the end cover second air inlet 19 to be sucked into the distributor 4. The gas sucked from the end cover first air inlet 17 enters the lower compression chamber through the distributor first air inlet 21, and then is discharged from the pump body outlet 8 through the discharge side air duct 9 after work in the compression chamber; the gas sucked from the end cover second air inlet 19 enters the upper compression chamber through the distributor second air inlet 23, and then is discharged from the pump body outlet 8 through the discharge side air duct 9 after work in the compression chamber (the gas on the left and right sides is collected to the same pump body outlet 8 through the air duct 9).

[0047] In the single compression chamber, the impeller 2 rotates to make the gas compressed, and the first compression is completed in the compression chamber. Since the single suction port area of the distributor is larger than the single outlet port area, the gas enters through the large gas port (such as the first suction port 21 of the distributor) of the distributor 4, and after passing through the small gas port (such as the first outlet port 22 of the distributor), the gas is sharply contracted, the gas flow rate is significantly increased, and the second compression is completed when the gas is discharged from the compression chamber, which can effectively improve the compression ratio.

[0048] The liquid supplement port 6 of the compressor is arranged at the lower part, the supplemental water is supplied from the bottom, the water supply pressure is about 0.3 MPa, and the differential pressure of the supplemental water (the pressure difference between the inlet supplemental water pressure 0.3 MPa and the discharge side 0.1 MPa) is obtained. The left and right end covers 5 are communicated through the communication pipe 10, and during operation, the water flow rate is fast by using the supply and discharge pressure difference of the compressor, the flow rate is faster, the pressure is lower, and therefore a certain vacuum is formed in the compression chamber. The vacuum is superimposed with the centrifugal force of the vacuum pump, so as to form a higher compression ratio. Due to the increase of the flow rate, the compressor can suck more gas in the same time, so as to be more efficient and energy-saving.

[0049] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A single-stage double-acting four-suction liquid ring compressor, comprising a pump shaft (1), an impeller (2), a pump body (3) and two left and right end covers (5), the pump shaft (1) penetrating through the pump body (3), and the impeller (2) being arranged on the pump shaft (1), characterized in that: The impeller (2) is located in the middle of the pump body (3), tangent to the inner walls on both sides of the pump body (3), and the impeller (2) divides the oval pump cavity into two parts; the pump body (3) is provided with a partition plate, which divides the pump cavity into two parts; the impeller (2) and the partition plate together divide the oval pump cavity into two upper compression cavities (13) and two lower compression cavities (14); each end cover (5) is provided with two layers of suction and exhaust passages; the four compression cavities are independent of each other and are connected with the pump inlet (7) and the pump outlet (8) through the suction and exhaust passages on the adjacent end covers (5); The pump body (3) is provided with an air passage (9), and the suction side air passage and the discharge side air passage are arranged on the front and rear sides of the pump cavity, and the pump inlet (7) and the pump outlet (8) are connected with the left and right end covers through the suction side air passage and the discharge side air passage on the front and rear sides. The partition plate includes an impeller partition plate (11) and pump body partition plates (12) on the upper and lower sides, and the pump body partition plates (12) on the upper and lower sides form a circle matched with the outer diameter of the impeller (2). The end cover (5) is provided with a liquid supplementing port (6), and the liquid supplementing port (6) is connected with the compression cavity; the left and right end covers (5) are also connected through the communication pipe (10) at the bottom of the pump body (3).

2. The single-stage double-sided four-suction type liquid ring compressor according to claim 1, characterized by: The end cover (5) is provided with an end cover first suction port (17), an end cover first exhaust port (18), an end cover second suction port (19), and an end cover second exhaust port (20) on the end surface connected with the pump body (3), the end cover first suction port (17) and the end cover second suction port (19) are connected with each other and with the end cover inlet (15), the end cover first exhaust port (18) and the end cover second exhaust port (20) are connected with each other and with the end cover exhaust port (16), the end cover inlet (15) and the end cover exhaust port (16) are connected with the suction side air passage and the discharge side air passage respectively, and the two suction ports and the two exhaust ports are cross-shaped and staggered.

3. The single-stage double-sided four-suction type liquid ring compressor according to claim 2, characterized by: It also includes left and right distributors (4), which are sleeved on the pump shaft (1), and a distributor first suction port (21), a distributor first exhaust port (22), a distributor second suction port (23), and a distributor second exhaust port (24) are arranged around the outer side surface of the distributor (4), the ports of the distributor (4) are connected with the ports of the end cover (5) one by one through the openings on the end surface of the distributor, the ports of the distributor (4) are connected with the compression cavities, and the end cover (5) is connected with the compression cavities through the distributor (4).

4. The single-stage double-sided four-suction type liquid ring compressor according to claim 3, characterized by: The outer side surface of the distributor (4) is cylindrical, and the inner side surface of the distributor (4) is conical.

5. The single-stage double-sided four-suction type liquid ring compressor according to claim 4, characterized by: The distributor (4) is provided with a plurality of liquid supplementing holes (25), and the liquid supplementing holes (25) connect the outer cylindrical surface and the inner conical surface of the distributor (4).

6. The single-stage double-sided four-suction type liquid ring compressor according to claim 3, characterized by: The area of a single suction port of the distributor is greater than the area of a single exhaust port.

7. The single-stage double-sided four-suction type liquid ring compressor according to claim 1, characterized by: The pump shaft (1) is provided with bearings (27) at both ends, and a gap is left between the front bearing (27) and the gland (28), and the rear bearing (27) is tightly attached to the gland (28).

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