A rotor pump

Abstract

The present invention belongs to the technical field of pumps, and specifically relates to a rotor pump, comprising a pump casing, a rotor cavity and a gear cavity being arranged inside the pump casing, and a mounting shaft being fixed on the pump casing; two rotors being arranged in the rotor cavity, and shaft sleeves being arranged on the two rotors, and the shaft sleeves being rotatably connected to the mounting shaft; two gears being arranged in the gear cavity; a first channel being provided on the partition plate and / or the pump casing, a second channel being provided on the pump casing, and a third channel being provided on the mounting shaft, the rotor cavity being communicated with the gear cavity through the first channel, the gear cavity being communicated with one end of the third channel through the second channel, and the other end of the third channel being communicated with the mounting shaft and the shaft sleeve, the gears squeezing the liquid medium in the gear cavity to increase its pressure, and pressing it into between the mounting shaft and the shaft sleeve from the second channel and the third channel, thereby generating a floating support effect on the shaft sleeve, reducing or offsetting the radial pressure on the shaft sleeve and the rotor in the rotor cavity, and thus hindering the reliability of the operation of the shaft sleeve, the rotor and the rotor pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of pumps, and in particular relates to a rotor pump. Background Art

[0002] A rotor pump is a pump that changes the working volume through the relative motion between the rotor and the pump body, thereby increasing the energy of the liquid. A rotor pump is a rotating positive displacement pump that achieves the purpose of conveying fluids by means of the periodic conversion of multiple fixed-volume delivery units in the working chamber. It has a positive displacement property and its flow rate does not change with changes in back pressure. The flow rate depends on the change in the volume of the working chamber and its frequency of change per unit time. In theory, it has nothing to do with the discharge pressure. During the working process, the rotor pump actually works through the rotation of two rotors in the pump casing. The two synchronously rotating rotors are driven by two synchronous gears in the pump casing through the drive shaft. Driven by the drive shaft, the two rotors rotate synchronously in opposite directions, causing the volume on the outlet side of the rotor pump to change, thereby forming a higher vacuum and discharge pressure. It is particularly suitable for the transportation of sanitary media and corrosive and high-viscosity liquid media.

[0003] When the rotor pump is working, the pressure on the outlet side of the rotor cavity will be greater than the pressure on the inlet side. For the rotor pump using sliding bearings, the pressure on the sleeve near the outlet side will be higher than that on the side near the inlet under working conditions. Since the flow rate of the rotor pump is linearly related to the speed of the internal rotor, the flow rate can be adjusted by adjusting the rotor speed. When the rotor speed is high, the pressure on the outlet side of the rotor pump will increase. In this state, the rotor and sleeve are subjected to high radial pressure, which may cause the sleeve to approach the shaft and the rotor to approach the inner wall of the pump casing, thereby increasing the friction resistance of the contact surface and causing contact surface wear, which will not only affect the fitting accuracy, but also affect the overall working reliability of the sleeve, rotor and even the rotor pump. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rotor pump that draws out part of the liquid medium from one side of the rotor cavity outlet for pressurization, and transports the pressurized liquid medium to the inner side of the sleeve, thereby reducing or offsetting the radial pressure on the sleeve and rotor in the rotor cavity and improving working reliability.

[0005] The present invention includes:

[0006] A pump housing, wherein a rotor chamber and a gear chamber are separated by a partition, a liquid inlet and a liquid outlet communicating with the rotor chamber are provided on the pump housing, and a mounting shaft is fixed to the pump housing, and the mounting shaft is located in the rotor chamber;

[0007] Two rotors, the two rotors are arranged in the rotor cavity, and the two rotors are provided with shaft sleeves, which are rotatably connected to the mounting shaft;

[0008] Two gears meshing with each other are disposed in the gear cavity and connected to the two rotors via a transmission shaft passing through the partition to drive the two rotors to rotate;

[0009] A first channel is provided on the partition and / or the pump housing, a second channel is provided on the pump housing, and a third channel is provided on the mounting shaft. The area in the rotor chamber between the two rotors and the liquid outlet is connected to the gear chamber through the first channel, the gear chamber is connected to one end of the third channel through the second channel, and the other end of the third channel is connected to the mounting shaft and the sleeve. When the two gears in the gear chamber rotate, at least one gear squeezes the liquid medium entering the gear chamber along the first channel to increase its pressure, and presses it into between the mounting shaft and the sleeve of at least one rotor through the second channel and the third channel.

[0010] Furthermore, a pressure chamber connected to the third channel is provided between the mounting shaft and the sleeve, and the pressurized liquid medium enters the pressure chamber through the second channel and the third channel in sequence.

[0011] Furthermore, it also includes a distribution sleeve, which is located between the shaft sleeve and the mounting shaft, the distribution sleeve is fixed on the mounting shaft, the shaft sleeve is arranged on the outside of the distribution sleeve and rotatably cooperates with the distribution sleeve, and the outer side surface of the distribution sleeve is provided with a concave cavity, and the pressure chamber is formed between the concave cavity and the inner side surface of the shaft sleeve, and the pressure chamber is provided with a distribution hole for the liquid medium to flow in and / or out.

[0012] Furthermore, the concave cavity is provided with one, and a pressure cavity formed between the concave cavity and the inner side surface of the sleeve is arranged toward the liquid outlet, and the pressure cavity is communicated with the third channel through the distribution hole.

[0013] Furthermore, two concave cavities are provided, and two pressure chambers are formed between the two concave cavities and the inner side surface of the sleeve, one pressure chamber is provided toward the liquid inlet, and the other pressure chamber is provided toward the liquid outlet. The number of distribution holes on the two pressure chambers is different, and both pressure chambers are connected to the third channel through at least one distribution hole.

[0014] Furthermore, a first stopper is provided on the inner wall of the gear cavity, and the first stopper is located on the side of one of the gears. When the gear rotates, the liquid medium is pressurized by the squeeze between the gear teeth and the first stopper and is pressed into the second channel.

[0015] Furthermore, a second stopper is provided on the inner wall of the gear cavity, the second stopper and the first stopper are located on the side of the same gear, and the second stopper and the first stopper are spaced apart on the inner wall of the gear cavity along the rotation direction of the gear, and one end of the first channel connecting the gear cavity and one end of the second channel connecting the gear cavity are located between the first stopper and the second stopper.

[0016] Furthermore, it also includes a pressure cover, which is arranged on the inner wall of the gear cavity and is located on the outside of one of the gears. The first stopper and the second stopper are arranged on the inside of the pressure cover. The pressure cover is also provided with a liquid inlet hole and a liquid outlet hole. The second stopper, the liquid inlet hole, the liquid outlet hole and the first stopper are arranged in sequence along the rotation direction of the gear where the pressure cover is located. The first channel is connected to the gear cavity through the liquid inlet hole, and the gear cavity is connected to the second channel through the liquid outlet hole.

[0017] Furthermore, the pump casing includes a shell and an end cover, the rotor chamber is located inside the shell, the gear chamber is located between the partition and the end cover, the partition is provided with channel one and channel two, and the end cover is provided with channel three, and channel one, channel two and channel three are connected in sequence to form the first channel.

[0018] Furthermore, a matching hole is provided on the partition plate, and the transmission shaft passes through the matching hole and is rotatably connected thereto. An annular groove 2 is provided inside the matching hole, and the hole 1 and the hole 2 are connected through the annular groove 2. A guide ring is fixedly provided in the annular groove 2, and the guide ring is sleeved on the transmission shaft, and an oil filling hole is radially provided on the guide ring.

[0019] The beneficial effect of the present invention is that part of the liquid medium in the rotor cavity near the liquid outlet side can enter the gear cavity through the first channel under the action of the rotor cavity pressure, and under the action of the rotor cavity pressure, the liquid medium entering the gear cavity itself can have a certain pressure, and under the extrusion of the gears in the gear cavity, the liquid medium is pressurized again to further increase its liquid pressure, and at the same time it is pressed into the space between the mounting shaft and the sleeve along the second channel and the third channel. The liquid medium pressed between the mounting shaft and the sleeve can be used for lubrication of the sleeve to reduce rust problems. On the other hand, the liquid pressure of the pressurized liquid medium can produce a floating support effect on the sleeve between the mounting shaft and the sleeve, so as to radially support the sleeve and the rotor, reduce or offset the radial pressure on the sleeve and the rotor in the rotor cavity, reduce or eliminate the friction on the inner side of the sleeve and ensure the matching accuracy between the rotor and the inside of the rotor cavity, and can also reduce friction resistance loss, improve energy conversion efficiency, ensure the reliability of the sleeve, rotor and rotor pump, and extend the service life of the sleeve, rotor and rotor pump.

[0020] At the same time, in the present invention, the gear driving the rotor is used as the boost driving force for the liquid medium, which is used to squeeze the liquid medium and further pressurize it to meet the liquid pressure required by the liquid medium supporting the shaft sleeve. Therefore, there is no need to set up additional power parts as the driving force for the liquid medium in the conveying channel, which reduces energy consumption and is also beneficial to controlling the overall volume of the rotor pump, thereby improving the structural compactness of the rotor pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 It is a structural schematic diagram of the rotor pump of the present invention.

[0022] Attachment Figure 2 It is a top view of the rotor pump of the present invention.

[0023] Attachment Figure 3 For the present invention Figure 2 Top view of .

[0024] Attachment Figure 4 For the present invention Figure 2 AA cross-sectional view.

[0025] Attachment Figure 5 For the present invention Figure 2 BB cross-sectional view.

[0026] Attachment Figure 6 For the present invention Figure 2 CC cross-sectional view.

[0027] Attachment Figure 7 For the present invention Figure 2 DD cross-sectional view.

[0028] Attachment Figure 8 For the present invention Figure 3 EE cross-sectional view.

[0029] Attachment Figure 9 It is a structural schematic diagram of the installation shaft of the present invention.

[0030] Attachment Figure 10 This is a schematic structural diagram of the partition of the present invention from a first perspective.

[0031] Attachment Figure 11 This is a schematic structural diagram of the partition of the present invention from a second perspective.

[0032] Attachment Figure 12 It is a structural schematic diagram of the guide ring of the present invention.

[0033] Attachment Figure 13 It is a structural schematic diagram of the pressurized cover of the present invention.

[0034] Attachment Figure 14 This is a schematic structural diagram of the distribution ring from the first perspective of the present invention.

[0035] Attachment Figure 15 This is a schematic structural diagram of the distribution ring from a second perspective of the present invention.

[0036] Attachment Figure 16 It is a schematic diagram of the matching structure of the distribution ring and the shaft sleeve of the present invention.

[0037] Attachment Figure 17 For the present invention Figure 16 Radial cross-sectional view.

[0038] In the figure, 1- pump housing; 11- housing; 111- rotor cavity; 112- liquid inlet; 113- liquid outlet; 114- channel five; 115- channel six; 12- end cover; 121- gear cavity; 122- channel three; 123- channel four; 124- first limiting groove; 125- second limiting groove; 13- first channel; 14- second channel; 2- partition; 21- channel one; 22- channel two; 23- annular groove two; 3 -rotor; 4-gear; 5-mounting shaft; 51-third channel; 52-annular groove 1; 6-drive shaft; 7-guide ring; 71-oil filling hole; 8-pressurization cover; 81-first stopper; 82-liquid inlet hole; 83-liquid outlet hole; 84-second stopper; 85-opening; 86-first limit block; 87-second limit block; 9-distribution sleeve; 91-concave cavity; 92-distribution hole; 93-mounting groove; 94-separator; 10-shaft sleeve. DETAILED DESCRIPTION

[0039] As attached Figure 1-17 As shown, the present invention includes:

[0040] The pump housing 1 has a rotor chamber 111 and a gear chamber 121 formed therein. The rotor chamber 111 and the gear chamber 121 are separated by a partition 2. The pump housing 1 has a liquid inlet 112 and a liquid outlet 113 connected to the rotor chamber 111. The pump housing 1 also has a mounting shaft 5 fixed thereto. The mounting shaft 5 is located in the rotor chamber 111.

[0041] Two rotors 3, the two rotors 3 are arranged in the rotor cavity 111, and the two rotors 3 are fixedly provided with shaft sleeves 10, and the shaft sleeves 10 are rotatably connected to the mounting shaft 5;

[0042] Two gears 4 are disposed in the gear cavity 121 and connected to the two rotors 3 located in the rotor cavity 111 via a transmission shaft 6 passing through the partition 2 to drive the two rotors 3 to rotate;

[0043] A first channel 13 is formed on the partition 2 and / or the pump housing 1, a second channel 14 is formed on the pump housing 1, and a third channel 51 is formed on the mounting shaft 5. The area between the two rotors 3 and the liquid outlet 113 in the rotor chamber 111 is connected to the gear chamber 121 through the first channel 13, the gear chamber 121 is connected to one end of the third channel 51 through the second channel 14, and the other end of the third channel 51 is connected to the mounting shaft 5 and the sleeve 10. When the rotor pump is working, the two gears 4 in the gear chamber 121 drive the two rotors 3 in the rotor chamber 111 to rotate through the transmission shaft 6. In the process of the liquid medium in the rotor chamber 111 being squeezed out by the rotor 3 along the liquid outlet 113, part of the liquid medium enters the gear chamber 121 along the first channel 13 under the pressure of the rotor 3. When the two gears 4 in the gear chamber 121 rotate, at least one gear 4 squeezes the liquid medium entering the gear chamber 121 along the first channel 13 and squeezes it out from the second channel 14 and the third channel 51 to between the mounting shaft 5 and the sleeve 10 of at least one rotor 3.

[0044] In the rotor pump provided by the present invention, since the pressure on the side of the rotor chamber 111 near the liquid outlet 113 is greater than the pressure on the side near the liquid inlet 112, part of the liquid medium on the side of the rotor chamber 111 near the liquid outlet 113 can enter the gear chamber 121 through the first channel 13 under the action of the rotor chamber pressure, and under the action of the rotor chamber pressure, the liquid medium entering the gear chamber 121 itself can have a certain pressure, and under the extrusion of the gear 4 in the gear chamber 121, the liquid medium is pressurized again to further increase its liquid pressure, and at the same time, it is pressed into the space between the mounting shaft 5 and the shaft sleeve 10 along the second channel 14 and the third channel 51, and pressed into the space between the mounting shaft 5 and the shaft sleeve 10. On the one hand, the liquid medium between can be used to lubricate the sleeve 10 and reduce the rust problem. On the other hand, the liquid pressure of the pressurized liquid medium can produce a floating support for the sleeve 10 between the mounting shaft 5 and the sleeve 10, so as to provide radial support for the sleeve 10 and the rotor 3, reduce or offset the radial pressure on the sleeve 10 and the rotor 3 in the rotor cavity 111, so as to reduce or eliminate the friction on the inner side of the sleeve 10 and the fitting accuracy between the rotor 3 and the inside of the rotor cavity 111, reduce friction resistance loss, improve energy conversion efficiency, ensure the reliability of the sleeve 10, rotor 3 and rotor pump, and extend the service life of the sleeve 10, rotor 3 and rotor pump.

[0045] At the same time, in the present invention, the gear 4 that drives the rotor 3 is used as the boost driving force for the liquid medium, which squeezes the liquid medium to further boost the pressure, thereby meeting the liquid pressure required by the liquid medium supporting sleeve 10. Therefore, there is no need to set up additional power parts as the driving force for the liquid medium in the conveying channel, which reduces energy consumption, is also beneficial to controlling the overall volume of the rotor pump, and improves the structural compactness of the rotor pump.

[0046] A pressure chamber for accommodating a liquid medium is provided between the mounting shaft 5 and the sleeve 10. The pressure chamber is connected to the third channel 51. The pressurized liquid medium passes through the second channel 14 and the third channel 51 in sequence before entering the pressure chamber. This ensures that the amount of liquid medium entering between the mounting shaft 5 and the sleeve 10 is sufficient to provide ideal radial floating support for the bearing 10, thereby offsetting greater external radial forces.

[0047] On the basis of providing the pressure chamber, in one embodiment of the present invention, the sleeve 10 is directly provided on the mounting shaft 5 , and the pressure chamber is opened on the inner side surface of the sleeve 10 and / or the outer side surface of the mounting shaft 5 .

[0048] In a preferred embodiment of the present invention, a flow distribution sleeve 9 is further included. The flow distribution sleeve 9 is located between the shaft sleeve 10 and the mounting shaft 5. The flow distribution sleeve 9 is fixed on the mounting shaft 5. The shaft sleeve 10 is sleeved on the outside of the flow distribution sleeve 9 and is rotatably connected to the flow distribution sleeve 9. There is a clearance fit between the shaft sleeve 10 and the flow distribution sleeve 9, that is, the shaft sleeve 10 is rotatably connected to the mounting shaft 5 through the flow distribution sleeve 9. In this embodiment, a concave cavity 91 is provided on the outer side of the flow distribution sleeve 9. The pressure chamber is formed between the concave cavity 91 and the inner side of the shaft sleeve 10 to ensure the integrity of the inner side of the shaft sleeve 10, that is, to ensure the integrity of the sliding surface of the shaft sleeve 10. The pressure chamber is provided with a flow distribution hole 92 for the liquid medium to flow in and / or out. The flow distribution hole 92 is provided on the flow distribution sleeve 9, specifically, in the concave cavity 91 that forms the pressure chamber.

[0049] Because the pressure in the rotor cavity 111 is higher on the side near the liquid outlet 113, the shaft sleeve 10 is subjected to greater radial pressure on this side. Based on the provision of the distribution sleeve 9, in one embodiment of the present invention, a single concave cavity 91 is provided, thereby forming a single pressure chamber. By aligning the pressure chamber formed between the concave cavity 91 and the inner side of the shaft sleeve 10 toward the liquid outlet 113, the radial pressure on the shaft sleeve 10 on the side near the liquid outlet 113 is reduced or offset by the liquid medium pressed into the pressure chamber, thereby balancing the force on the shaft sleeve 10 within the rotor cavity 111. In this embodiment, the distribution hole 92 allows the liquid medium to flow into the pressure chamber. Therefore, the pressure chamber is connected to the third channel 51 through the distribution hole 92. The pressurized liquid medium passes through the second channel 14 and the third channel 51 in sequence, and then enters the pressure chamber from the distribution hole 92. The liquid medium in the pressure chamber can then be pressed out into the rotor cavity 111 through the gap between the shaft sleeve 10 and the distribution sleeve 9.

[0050] In another embodiment of the present invention, two concave cavities 91 are provided, and two pressure chambers are formed between the two concave cavities 91 and the inner side surface of the sleeve 10, wherein one pressure chamber is provided toward the liquid inlet 112, and the other pressure chamber is provided toward the liquid outlet 113. The number of distribution holes 92 on the two pressure chambers is different, and both pressure chambers are connected to the third channel 51 through at least one distribution hole 92.

[0051] Based on the embodiment in which two concave cavities 91 are provided, in a first preferred embodiment, the pressure chamber facing the liquid outlet 113 has a greater number of distribution holes 92 than the number of distribution holes 92 on the pressure chamber facing the liquid inlet 112, and the distribution holes 92 on both pressure chambers are used to allow liquid medium to flow into the pressure chambers. Therefore, when the flow rate entering each distribution hole 92 is the same, the pressure chamber with a greater number of distribution holes 92 will have a greater amount of liquid medium entering per unit time, and will generate a greater liquid pressure on the inner side of the shaft sleeve 10, thereby balancing the radial pressure on the shaft sleeve 10 on both sides of the liquid inlet 112 and the liquid outlet 113. In this first preferred embodiment, the liquid medium in both pressure chambers is pressed out from the gap between the shaft sleeve 10 and the distribution sleeve 9.

[0052] Based on the embodiment in which two concave cavities 91 are provided, in the second preferred embodiment, the number of distribution holes 92 in the pressure chamber facing the liquid inlet 112 is greater than the number of distribution holes 92 in the pressure chamber facing the liquid outlet 113, and the number of distribution holes 21 in both pressure chambers that communicate with the third channel 51 is the same. In this second preferred embodiment, the distribution holes 92 in the pressure chamber facing the liquid outlet 113 are all connected to the third channel 51, that is, the distribution holes 92 in this pressure chamber are all used to allow liquid medium to flow into the pressure chamber. In the pressure chamber facing the liquid inlet 112, only some of the distribution holes 92 are connected to the third channel 51. The distribution holes 92 connected to the third channel 51 are used to allow liquid medium to flow in, and the remaining distribution holes 92 are not connected to the third channel 51, but are connected to the rotor chamber 111 or other components to allow liquid medium to flow out. For example, if there are two distribution holes 92 on the pressure chamber facing the liquid inlet 112, one distribution hole 92 is connected to the third channel 51, and the other distribution hole 92 is used to allow the liquid medium to flow out. There is only one distribution hole 92 on the pressure chamber facing the liquid outlet 113, which is also connected to the third channel 51. Therefore, when the amount of liquid medium entering the two pressure chambers per unit time is the same, the liquid medium in the pressure chamber facing the liquid outlet 113 is pressed out from the gap between the shaft sleeve 10 and the distribution sleeve 9, while the liquid medium in the pressure chamber facing the liquid inlet 112 can not only be pressed out from the gap between the shaft sleeve 10 and the distribution sleeve 9, but can also flow out from some of the distribution holes 92, releasing the pressure faster, so that the internal pressure of the pressure chamber facing the liquid inlet 112 will be lower than the internal pressure of the pressure chamber facing the liquid outlet 113, thereby balancing the radial pressure on the shaft sleeve 10 on both sides of the liquid inlet 112 and the liquid outlet 113.

[0053] On the basis of the two concave cavities 91, an annular groove 52 is provided on the mounting shaft 5 in the present invention. The annular groove is located between the mounting shaft 5 and the distribution sleeve 9. The end of the third channel 51 away from the second channel 14 is connected to the annular groove 52. Figure 9 As shown, the liquid medium enters the third channel 51 from the direction of the left arrow, and then enters the annular groove 1 52 from the third channel 51 from the direction of the right arrow. In the above-mentioned first preferred embodiment, the annular groove 1 52 is connected with all the distribution holes 92 on the two pressure chambers. In the above-mentioned second preferred embodiment, the annular groove 1 51 is connected with all the distribution holes 92 on the pressure chamber in the direction of the liquid outlet 113 and part of the distribution holes 92 on the pressure chamber in the direction of the liquid inlet 112, so as to simultaneously transport the liquid medium into the two pressure chambers.

[0054] On the basis of the two concave cavities 91 being provided, as Figure 16 and 17As shown, the present invention also includes setting two separators 94, which are fixed on the distribution sleeve 9 and located between the distribution sleeve 9 and the shaft sleeve 10. The gap between the separator 94 and the shaft sleeve 10 is smaller than the gap between the distribution sleeve 9 and the shaft sleeve 10, and the two separators 94 are respectively located between the two ends of the two concave cavities 91 to form different pressure areas between the shaft sleeve 10 and the distribution sleeve 9. The specific installation method of the separator 94 is as follows: Figure 14 and 15 As shown, the distribution sleeve 9 is provided with two mounting grooves 93 , which are respectively located between the two ends of the two concave cavities 91 , and the two separators 94 are respectively stuck in the two mounting grooves 93 , without the need for additional fixing parts, thereby reducing the structural complexity during assembly.

[0055] The gear chamber 121 pressurizes the liquid medium by squeezing the liquid medium when the two gears 4 mesh and rotate. In a preferred embodiment of the present invention, the rotation of a single gear 4 in the gear chamber 121 is utilized. Specifically, a first stopper 81 is provided on the inner wall of the gear chamber 121. The first stopper 81 is located on the side of one of the gears 4 in the gear chamber 121. When the gear 4 rotates, its teeth and the first stopper 81 move relative to each other, squeezing the liquid medium between the teeth of the gear 4 and the first stopper 81 to increase its pressure, and pressing the pressurized liquid medium into the second channel 14, so that it is sent into the pressure chamber along the second channel 14 and the third channel 51.

[0056] A second stopper 84 is also provided on the inner wall of the gear cavity 121. The second stopper 84 and the first stopper 81 are located on the side of the same gear 4, and are spaced apart from each other along the rotational direction of the gear 4. One end of the first channel 13 communicating with the gear cavity 121 and one end of the second channel 14 communicating with the gear cavity 121 are located between the first stopper 81 and the second stopper 84. The provision of the second stopper 84, to a certain extent, prevents the liquid medium from flowing in the direction opposite to the rotation of the corresponding gear 4, thereby facilitating the gear 4 to transport the liquid medium entering the gear cavity in the direction of its rotation.

[0057] In one embodiment of the present invention, the first stopper 81 and the second stopper 84 are directly arranged on the inner wall of the gear chamber 121, such as being integrally formed. In another embodiment, the first stopper 81 and the second stopper 84 are indirectly arranged on the inner wall of the gear chamber 121, and further include a pressurizing cover 8, which is fixedly arranged on the inner wall of the gear chamber 121 and is located on the outside of one of the gears 4 in the gear chamber 121. The first stopper 81 and the second stopper 84 are arranged on the inner side of the pressurizing cover 8, and the pressurizing cover 8 is also provided with a liquid inlet 82 and a liquid outlet 83. The second stopper 84, the liquid inlet 82, the liquid outlet 83 and the first stopper 81 are arranged in sequence along the rotation direction of the gear 4 where the pressurizing cover 8 is located. The first channel 13 is connected to the gear chamber 121 through the liquid inlet 82, and the gear chamber 121 is connected to the second channel 14 through the liquid outlet 83.

[0058] Preferably, the first stopper 81, the second stopper 84 and the pressure cover 8 are integrally formed, and the transition area between the first stopper 81, the second stopper 84 and the inner side of the pressure cover 8 is a curved surface transition. When the liquid medium is a liquid with a high viscosity, the setting of the curved surface transition area can facilitate the flow of the liquid medium and avoid the liquid medium from getting stuck in the gap.

[0059] The pressure cover 8 is annular and is provided with an opening 85. The opening 85 is provided as follows: Figure 13 As shown, the gear 4 located in the pressurizing cover 8 can mesh with another gear 4 in the gear cavity 121 through the opening 85, and the meshing between the gears 4 is not affected when the liquid medium is pressurized.

[0060] like Figure 13 As shown, the thickness of the area on the pressurizing cover 8 between the liquid inlet 81 and the liquid outlet 82 gradually increases along the direction from the liquid inlet 81 to the liquid outlet 82. As the gear 4 rotates, the gap between the tooth tips of the gear 4 and the inner side of the pressurizing cover 8 gradually decreases in the area on the upper edge of the pressurizing cover 8 between the liquid inlet 81 and the liquid outlet 82, gradually squeezing the liquid medium and increasing its pressure.

[0061] In the present invention, the pump housing 1 includes a housing 11 and an end cover 12 . The rotor cavity 111 is located inside the housing 11 , and the gear cavity 121 is located between the partition plate 2 and the end cover 12 .

[0062] The specific opening path of the first channel 13 is as follows: the partition 2 is provided with a channel 1 21 connected to the rotor cavity 111 and a channel 2 22 connected to the channel 1 21, the end cover 12 is provided with a channel 3 122 connected to the channel 2 22, and the channel 3 122 is connected to the liquid inlet hole 82 on the pressurization cover 8, the channel 1 21, the channel 2 22 and the channel 3 122 are connected in sequence to form the first channel 13, and the channel 1 21 is connected to the rotor cavity 111. Among them, a matching hole is provided on the partition 2, and the transmission shaft 6 passes through the matching hole and is rotatably connected thereto. An annular groove 23 is provided on the inner side of the matching hole, and the channel 1 21 and the channel 2 22 are connected through the annular groove 23. The liquid medium entering the annular groove 2 23 along the channel 1 21 can lubricate the surface of the transmission shaft 6. Specifically, a guide ring 7 is also fixedly provided in the annular groove 23, and the guide ring 7 is sleeved on the transmission shaft 6, and an oil filling hole 71 is radially provided on the guide ring 7. Most of the hydraulic medium entering the annular groove 23 flows out along the channel 2 22, and a small part of the liquid medium can enter between the guide ring 7 and the transmission shaft 6 through the oil filling hole 71 on the guide ring 7 to lubricate the surface of the transmission shaft 6.

[0063] The specific opening path of the second channel 14 is as follows: the end cover 12 is provided with a channel 4 123 connected to the liquid outlet 83 on the pressurized cover 8, the shell 11 is provided with a channel 5 114 connected to the channel 4 123 along the axial direction, and the shell 11 is provided with a channel 6 115 connected to the channel 5 114 downwardly on the back of the shell 11. Figure 6 and Figure 7 As shown, channel four 123, channel five 114 and channel six 115 are connected in sequence to form a second channel.

[0064] The specific opening path of the third channel 51 is as follows Figure 8 and 9 As shown, one end thereof is connected to the hole six 115, and the other end is connected to the annular groove one 52.

[0065] The specific process of the liquid medium of the present invention entering the inner side of the sleeve 10 is as follows: when the rotor 3 presses the liquid medium on the side of the liquid outlet 113 in the rotor cavity 111 out from the liquid outlet 113, part of the liquid medium on this side enters the channel 1 21 on the partition 2 under the action of pressure, and enters the channel 2 22 through the annular groove 23, and then enters the gear cavity 121 along the liquid inlet 82 on the pressure cover 8 through the channel 3 122. The liquid medium is pressurized by the gear 4 through the pressure cover 8, and is pressed out from the liquid outlet 83 to the channel 4 123, and passes through the channel 5 114 and the channel 6 115 in turn to enter the third channel 51, and then enters the pressure cavity formed by the concave cavity 91 and the inner side of the sleeve 10 through the distribution hole 92, providing floating support for the sleeve 10.

Claims

1. A rotor pump, comprising: A pump housing (1), wherein a rotor chamber (111) and a gear chamber (121) are separated by a partition (2) inside the pump housing (1), a liquid inlet (112) and a liquid outlet (113) communicating with the rotor chamber (111) are provided on the pump housing (1), and a mounting shaft (5) is fixed to the pump housing (1), and the mounting shaft (5) is located in the rotor chamber (111); Two rotors (3), the two rotors (3) are arranged in the rotor cavity (111), and the two rotors (3) are provided with shaft sleeves (10), and the shaft sleeves (10) are rotatably connected to the mounting shaft (5); Two gears (4) meshing with each other, the two gears (4) being arranged in the gear cavity (121), and the two gears (4) being connected to the two rotors (3) via a transmission shaft (6) penetrating the partition (2) to drive the two rotors (3) to rotate; A first channel (13) is provided on the partition (2) and / or the pump housing (1), a second channel (14) is provided on the pump housing (1), and a third channel (51) is provided on the mounting shaft (5). An area between the two rotors (3) and the liquid outlet (113) in the rotor chamber (111) is communicated with the gear chamber (121) through the first channel (13), the gear chamber (121) is communicated with one end of the third channel (51) through the second channel (14), and the other end of the third channel (51) is communicated with the mounting shaft (5) and the shaft sleeve (10). When the two gears (4) in the gear chamber (121) rotate, at least one gear (4) squeezes the liquid medium entering the gear chamber (121) along the first channel (13) to increase its pressure, and presses the liquid medium from the second channel (14) and the third channel (51) into between the mounting shaft (5) and the shaft sleeve (10) of at least one rotor (3); The pump casing (1) comprises a casing (11) and an end cover (12); the rotor chamber (111) is located inside the casing (11); the gear chamber (121) is located between the partition (2) and the end cover (12); a first channel (21) and a second channel (22) are provided on the partition (2); a third channel (122) is provided on the end cover (12); the first channel (21), the second channel (22) and the third channel (122) are connected in sequence to form the first channel (13).

2. The rotor pump according to claim 1, wherein: A pressure chamber connected to the third channel (51) is provided between the mounting shaft (5) and the shaft sleeve (10), and the pressurized liquid medium enters the pressure chamber through the second channel (14) and the third channel (51) in sequence.

3. The rotor pump according to claim 2, wherein: The invention also includes a distribution sleeve (9), wherein the distribution sleeve (9) is located between the shaft sleeve (10) and the mounting shaft (5), the distribution sleeve (9) is fixed on the mounting shaft (5), the shaft sleeve (10) is sleeved on the outside of the distribution sleeve (9) and rotatably cooperates with the distribution sleeve (9), the outer side surface of the distribution sleeve (9) is provided with a concave cavity (91), the pressure chamber is formed between the concave cavity (91) and the inner side surface of the shaft sleeve (10), and the pressure chamber is provided with a distribution hole (92) for the liquid medium to flow in and / or out.

4. The rotor pump according to claim 3, wherein: The concave cavity (91) is provided with a pressure cavity formed between the concave cavity (91) and the inner side surface of the shaft sleeve (10) and arranged toward the liquid outlet (113). The pressure cavity is communicated with the third channel (51) through the distribution hole (92).

5. The rotor pump according to claim 3, wherein: Two concave cavities (91) are provided, and two pressure cavities are formed between the two concave cavities (91) and the inner side surface of the shaft sleeve (10), wherein one pressure cavity is provided toward the liquid inlet (112), and the other pressure cavity is provided toward the liquid outlet (113). The two pressure cavities have different numbers of distribution holes (92), and both pressure cavities are connected to the third channel (51) through at least one distribution hole (92).

6. The rotor pump according to any one of claims 1 to 5, characterized in that: A first stopper (81) is provided on the inner wall of the gear cavity (121). The first stopper (81) is located on the side of one of the gears (4). When the gear (4) rotates, the liquid medium is pressurized by the squeeze between the teeth of the gear (4) and the first stopper (81) and is pressed into the second channel (14).

7. The rotor pump according to claim 6, wherein: A second stopper (84) is further provided on the inner wall of the gear chamber (121). The second stopper (84) and the first stopper (81) are located on the side of the same gear (4). The second stopper (84) and the first stopper (81) are spaced apart on the inner wall of the gear chamber (121) along the rotation direction of the gear (4). One end of the first channel (13) communicating with the gear chamber (121) and one end of the second channel (14) communicating with the gear chamber (121) are located between the first stopper (81) and the second stopper (84).

8. The rotor pump according to claim 7, wherein: The invention also includes a pressurizing cover (8), which is arranged on the inner wall of the gear cavity (121) and is located on the outside of one of the gears (4). The first stopper (81) and the second stopper (84) are arranged on the inner side of the pressurizing cover (8). The pressurizing cover (8) is also provided with a liquid inlet hole (82) and a liquid outlet hole (83). The second stopper (84), the liquid inlet hole (82), the liquid outlet hole (83) and the first stopper (81) are arranged in sequence along the rotation direction of the gear (4) where the pressurizing cover (8) is located. The first channel (13) is connected to the gear cavity (121) through the liquid inlet hole (82), and the gear cavity (121) is connected to the second channel (14) through the liquid outlet hole (83).

9. The rotor pump according to claim 1, wherein: A matching hole is provided on the partition (2), and the transmission shaft (6) passes through the matching hole and is rotatably connected thereto. A second annular groove (23) is provided on the inner side of the matching hole. The first hole (21) and the second hole (22) are connected via the second annular groove (23). A guide ring (7) is fixedly provided in the second annular groove (23). The guide ring (7) is sleeved on the transmission shaft (6), and an oil injection hole (71) is radially provided on the guide ring (7).

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