Triangular rotor pump

Abstract

The application relates to a triangular rotor pump, which comprises a shell, a triangular rotor arranged in the shell, and an eccentric assembly for driving the triangular rotor, the shell comprising a side wall, a first end cover and a second end cover arranged at two ends of the side wall respectively, and the triangular rotor comprising a rotor body and a sealing member arranged on the rotor body, the sealing member being an elastic structure, and the rotor body comprising three top ends and side surfaces respectively facing the first end cover and the second end cover, wherein the sealing member comprises three first sealing parts arranged on the three top ends respectively, each first sealing part abutting against the inner surface of the side wall to form a radial sealing surface for blocking adjacent working cavities, and the sealing member further comprises two second sealing parts arranged at two ends in the axial direction of the rotor body respectively, the two second sealing parts abutting against the first end cover and the second end cover respectively to form end face sealing surfaces; the two ends of each first sealing part are gaplessly matched with the two second sealing parts, so that radial sealing and end face sealing are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotor pump, in particular to a triangular rotor pump. BACKGROUND

[0002] In the technical field of rotor pump, the internal working chamber of the triangular rotor pump is divided into three closed spaces by the triangular rotor. The fluid is transported by means of the periodic change of the three closed volume spaces during the movement of the triangular rotor. The premise of the function realization of the triangular rotor pump is that the volume of the pump body can always ensure sufficient sealing. Therefore, the sealing performance is an important indicator for testing the performance of the triangular rotor pump.

[0003] In order to improve the sealing performance of the triangular rotor pump, the three top ends and the two side end faces of the triangular rotor need to be sealed by contact between the pump body inner cavity wall. Specifically, it includes reliable sealing of the radial top end and reliable sealing of the two side end faces. At present, according to different working pressures of the triangular rotor pump, three sealing schemes are usually adopted in the prior art. When the pressure requirement is not high, the radial top end of the triangular rotor is sealed by a sealing sheet and a spring, and the two side end faces of the triangular rotor are sealed by a gap. When the pressure requirement is higher, the radial top end of the triangular rotor is sealed by a sealing sheet and a spring, and the two side end faces of the triangular rotor are sealed by a sealing strip and a spring. If the pressure requirement is higher, in addition to the radial top end of the triangular rotor being sealed by a sealing sheet and a spring, and the two side end faces of the triangular rotor being sealed by a sealing strip and a spring, a sealing pin is also installed at both ends of the sealing sheet of the radial top end of the triangular rotor to further prevent liquid leakage from the gap between the sealing sheet and the sealing pin. However, due to the structural problems of the three sealing schemes, the gap cannot be completely eliminated. At the same time, the above sealing piece plus spring scheme involves more structural parts, and the subsequent processing and assembly process and cost requirements are very high.

[0004] Therefore, it is particularly important to provide a triangular rotor pump with better sealing performance and simple processing and assembly process. SUMMARY

[0005] Therefore, it is particularly important to provide a triangular rotor pump with better sealing performance and simple processing and assembly process.

[0006] The application provides a triangular rotor pump, comprising a shell, the shell comprising a side wall and a first end cover and a second end cover arranged at two ends of the side wall respectively, a triangular rotor arranged in the shell and an eccentric assembly driving the triangular rotor, three working cavities being formed between the triangular rotor and the shell, the triangular rotor being capable of being driven to alternately compress and release the working cavities; the triangular rotor comprises a rotor body and a sealing member arranged on the rotor body, the sealing member being an elastic structure, the rotor body comprising three top ends and a side surface facing the first end cover and the second end cover respectively, wherein:

[0007] the sealing member comprises three first sealing portions arranged on the three top ends respectively, each first sealing portion abutting against the inner surface of the side wall to form a radial sealing surface blocking adjacent working cavities; the sealing member further comprises two second sealing portions arranged at two ends of the rotor body in the axial direction respectively, the second sealing portions abutting against the first end cover and the second end cover respectively to form end face sealing surfaces; the two ends of the first sealing portion are both gapless matched with the two second sealing portions.

[0008] In the above triangular rotor pump, the first end cover, the second end cover and the side wall form a containing space for containing the triangular rotor, the triangular rotor divides the containing space into three working cavities, the two ends of the first sealing portion are both gapless matched with the two second sealing portions, so that the two ends of the first sealing portion are both gapless matched with the two second sealing portions, at this time, the first sealing portion and the second sealing portion are always in contact, there is no gap between the first sealing portion and the second sealing portion in the rotation process of the triangular rotor, and thus the radial sealing surface and the end face sealing surface are both continuous surfaces, the first sealing portion is arranged on the top end and abuts against the inner surface of the side wall, so that the working cavities are sealed, the triangular rotor can be driven to alternately compress and release the working cavities, and since the sealing member is an elastic structure, the gap between adjacent working cavities is eliminated, so that the first sealing portion and the inner surface of the side wall have a continuous acting force in the axial direction, and thus the first sealing portion and the side wall are continuously in contact in the axial direction, thereby realizing the radial sealing of the triangular rotor pump; since the sealing member is an elastic structure, the two second sealing portions are arranged at two ends of the rotor body in the axial direction respectively, and the second sealing portions abut against the first end cover and the second end cover respectively, so that the second sealing portions and the first end cover and the second end cover have a continuous acting force, and thus the second sealing portions and the first end cover and the second end cover are continuously in contact in the circumferential direction, thereby realizing the end face sealing of the triangular rotor pump and preventing fluid from flowing out of the gap between the triangular rotor and the end cover. The above sealing member has a simple structure and can realize reliable sealing only by being arranged on the rotor body, and the machining and assembly process is simple.

[0009] In one of the embodiments, the first sealing part comprises a semi-cylindrical protrusion protruding from the top end, a length direction of the semi-cylindrical protrusion is consistent with a thickness direction of the top end of the rotor body, and a circumferential outer edge of the semi-cylindrical protrusion abuts against an inner surface of the side wall.

[0010] In the technical solution, the first sealing part is arranged as a semi-cylindrical protrusion matching the top end of the rotor body, and the circumferential outer edge of the semi-cylindrical protrusion is arranged to abut against the inner surface of the side wall, so as to realize the radial sealing of the triangular rotor pump.

[0011] In one of the embodiments, a plurality of first springs are arranged in an axial direction of the rotor body inside the semi-cylindrical protrusion, and an elastic direction of the first springs is perpendicular to the inner surface of the side wall, so as to provide an elastic force for switching the axial sealing contact.

[0012] In one of the embodiments, the second sealing part comprises two groups of annular elastic members, the two groups of annular elastic members are arranged at two edge regions of the sealing part close to the first end cover and the second end cover respectively, and each annular elastic member abuts against an inner wall of the first end cover or the second end cover adjacent thereto.

[0013] Each group of annular elastic members comprises three elastic edges connected in a head-to-tail manner, each elastic edge is arranged between two first sealing parts adjacent thereto and connected to the two first sealing parts respectively, and each elastic edge comprises an abutting surface facing the first end cover or the second end cover, the abutting surface is arranged to abut against the first end cover and the second end cover, so as to form the end face sealing surface.

[0014] In the technical solution, the second sealing part is arranged as two groups of annular elastic members to match the first end cover and the second end cover respectively, and each group of annular elastic members comprises three elastic edges connected in a head-to-tail manner, each elastic edge comprises an abutting surface facing the first end cover or the second end cover, and the abutting surface is arranged to abut against the first end cover or the second end cover, so as to realize the end face sealing of the triangular rotor pump.

[0015] In one of the embodiments, the abutting surface is arranged at an angle with respect to the inner wall of the corresponding first end cover or second end cover, and an end of the abutting surface away from the side surface abuts against the inner wall of the corresponding first end cover or second end cover, so as to form the end face sealing surface and realize the end face sealing of the triangular rotor pump.

[0016] In one of the embodiments, each of the elastic edges comprises a groove formed along the extension direction of the elastic edge, each of the grooves starts from one of the first sealing portions and ends at the adjacent one of the first sealing portions, and both ends of the groove extend to the first sealing portion at most partially, and three of the grooves are arranged in the axial direction of the rotor body and are not connected between two adjacent grooves.

[0017] In the above technical solution, the grooves are arranged on the elastic edge, and part of the grooves extend to the first sealing portion, so that the fluid enters the groove during operation, and the elastic edge is better attached to the first end cover and the second end cover under the action of fluid pressure, thereby improving the end face sealing effect.

[0018] In one of the embodiments, the distance between the ends of the adjacent grooves on each of the first sealing portions is a preset distance, which is located at the middle position in the circumferential direction of the first sealing portion, so as to ensure that the radial sealing effect and the end face sealing effect are obtained at the same time.

[0019] In one of the embodiments, the preset distance is greater than or equal to 1 / 3 of the width of the first sealing portion and less than or equal to 1 / 2 of the width of the first sealing portion.

[0020] In the above technical solution, the extension length of the preset distance on the first sealing portion is set, so that better end face sealing effect is obtained on the basis of ensuring radial sealing.

[0021] In one of the embodiments, a second spring is arranged in the groove, the second spring is a wave spring, and the wave spring is arranged along the length direction of the groove to provide elastic force for switching the radial sealing contact.

[0022] In one of the embodiments, the sealing member is of an integrated structure and is wrapped outside the rotor body, so as to simplify the processing and assembly process and improve the reliability of the sealing.

[0023] In one of the embodiments, the sealing member is non-rotatably sleeved outside the rotor body, so as to avoid slipping of the sealing member relative to the rotor body during rotation on the basis of ensuring the sealing reliability.

[0024] In one of the embodiments, the rotor body further comprises a first surface facing the inner surface of the side wall in the circumferential direction, and a second surface for cooperating with the first surface is arranged on the inner wall of the sealing member, the cooperation of the first surface and the second surface enables the sealing member to be non-rotatably sleeved outside the rotor body, so as to prevent the sealing member from slipping relative to the rotor body during rotation.

[0025] In one of the embodiments, a plurality of grooves are arranged on the first surface, and a plurality of protrusions complementary to the grooves are arranged on the second surface of the sealing member, and the protrusions are matched with the grooves and are accommodated in the grooves to non-rotatably connect the sealing member to the rotor body.

[0026] In the above technical solution, the grooves are arranged on the first surface, the protrusions complementary to the grooves are arranged on the second surface, and the protrusions are accommodated in the grooves to prevent the sealing member from slipping relative to the rotor body during rotation.

[0027] In one of the embodiments, the triangular rotor further comprises an axial limiting structure arranged between the sealing member and the rotor body, the axial limiting structure makes the sealing member non-movable relative to the rotor body in the axial direction to tightly attach the sealing member to the rotor body and prevent the sealing member from moving in the axial direction.

[0028] In one of the embodiments, the axial limiting structure comprises a step structure arranged circumferentially on the rotor body and a slot arranged on the sealing member for cooperating with the step structure, the two second sealing portions are integrally connected to each other, and the slot for cooperating with the step structure is formed between the two second sealing portions, and when the sealing member is sleeved on the rotor body, the step structure is clamped in the slot to limit the axial movement of the sealing member relative to the rotor body.

[0029] In the above technical solution, the step structure is arranged circumferentially on the rotor body, the slot for cooperating with the step structure is arranged on the sealing member, and the step structure is clamped in the slot to tightly attach the sealing member to the rotor body and prevent the sealing member from moving in the axial direction.

[0030] In one of the embodiments, the sealing member is a polyurethane member or a rubber member.

[0031] In the above technical solution, the sealing member is limited to be a polyurethane member or a rubber member to improve the contact force between the sealing member and the inner surface of the side wall, the first end cover and the second end cover, but the sealing member is not limited thereto and can also be other elastic structural members.

[0032] In one of the embodiments, both ends of each of the end face sealing surfaces and each of the radial sealing surfaces intersect.

[0033] In the above technical solution, both ends of each of the end face sealing surfaces and each of the radial sealing surfaces are limited to intersect to make both ends of the first sealing portion gaplessly cooperate with the two second sealing portions, and thus the first sealing portion and the second sealing portion are always in contact, and there is no gap between the first sealing portion and the second sealing portion during the rotation of the triangular rotor, so that the radial sealing surface and the end face sealing surface are continuous surfaces. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structural schematic view of a triangular rotor pump provided by the present application;

[0035] Figure 2 Another structural schematic view of a triangular rotor pump provided by the present application;

[0036] Figure 3 A structural schematic view of a sealing member in a triangular rotor pump provided by the present application;

[0037] Figure 4 Another structural schematic view of a sealing member in a triangular rotor pump provided by the present application;

[0038] Figure 5 A structural schematic view of a rotor body in a triangular rotor pump provided by the present application.

[0039] Reference Signs:

[0040] 100 - side wall;

[0041] 200 - end cover;

[0042] 210 - first end cover; 220 - second end cover;

[0043] 300 - triangular rotor;

[0044] 310 - rotor body;

[0045] 311 - side surface; 312 - top end; 313 - first surface; 314 - groove; 315 - step structure;

[0046] 320 - sealing member; 321 - first sealing part; 322 - second sealing part; 323 - semi-cylindrical protrusion; 324 - annular elastic member; 3241 - second surface; 325 - elastic edge; 326 - abutting surface; 327 - groove; 328 - protruding part; 329 - embedding groove;

[0047] 400 - eccentric assembly;

[0048] 410 - eccentric shaft; 411 - eccentric part. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0050] The technical solutions provided by the embodiments of the present application will be described below with reference to the drawings.

[0051] AsFigure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown in FIGS. 1-4, the present application provides a triangular rotor pump for fluid delivery in a washing machine, comprising a housing having a side wall 100 and end covers 200 connected to the side wall 100, wherein the end covers 200 include a first end cover 210 and a second end cover 220 fixed at both ends of the side wall 100 to form a containing space, and further comprising a triangular rotor 300 and an eccentric assembly 400 driving the triangular rotor 300, which are disposed in the containing space and divide the containing space into three working chambers; the eccentric assembly 400 includes an eccentric shaft 410 having an eccentric portion 411 on which the triangular rotor 300 is connected, and the triangular rotor 300 is driven by the rotation of the eccentric shaft 410 so that the triangular rotor 300 can alternately compress and release the working chambers.

[0052] The triangular rotor 300 includes a rotor body 310 and a sealing member 320 disposed on the rotor body 310, wherein the rotor body 310 includes two side surfaces 311 facing the first end cover 210 and the second end cover 220 respectively, three top ends 312, and three first surfaces 313 connecting the two side surfaces 311 and facing the inner surface of the side wall 100, and each top end 312 is located at the intersection of adjacent two first surfaces 313. The sealing member 320 is a resilient structure having a certain elasticity and can produce compression deformation when under pressure, and includes three first sealing portions 321 and two second sealing portions 322, wherein each first sealing portion 321 abuts against the inner surface of the side wall 100 to form a radial sealing surface to block the adjacent working chamber, at this time the first sealing portion 321 is compressed and the first sealing portion 321 is subjected to extrusion force from the inner surface of the side wall 100; the two second sealing portions 322 are respectively disposed at both ends of the rotor body 310 in the axial direction and abut against the first end cover 210 and the second end cover 220 respectively to form end face sealing surfaces, and the two ends of the first sealing portion 321 are both gapless with the two second sealing portions 322, at this time the first sealing portion 321 and the second sealing portion 322 are always in contact, there is no gap between the first sealing portion 321 and the second sealing portion 322 during the rotation of the triangular rotor 300, and thus the radial sealing surface and the end face sealing surface are both continuous surfaces.

[0053] The first end cover 210, the second end cover 220 and the side wall 100 form a containing space for containing the triangular rotor 300. Since the first sealing part 321 is arranged at the top end 312 and abuts against the inner surface of the side wall 100 to form a radial sealing surface, and the two ends of the first sealing part 321 are both gapless matched with the two second sealing parts 322, the radial sealing surface is a continuous surface. The continuous radial sealing surface cooperates with the triangular rotor 300 to divide the containing space into three independent working chambers. The triangular rotor 300 can be driven to alternately compress and release the working chambers. Since the sealing member 320 is an elastic structure, the gap between the adjacent working chambers is eliminated, so that the first sealing part 321 has a continuous force with the inner surface of the side wall 100, and the first sealing part 321 and the side wall 100 are continuously contacted in the axial direction, thereby realizing the radial sealing of the triangular rotor pump. Since the sealing member 320 is an elastic structure, the second sealing part 322 is arranged at the two ends of the rotor body 310 in the axial direction, the two ends of the first sealing part 321 are both gapless matched with the two second sealing parts 322, so that the end surface sealing surface is a continuous surface, and the second sealing part 322 abuts against the first end cover 210 and the second end cover 220. At this time, the second sealing part 322 is compressed and is subjected to the extrusion force from the first end cover 210 and the second end cover 220. The continuous end surface sealing surface makes the second sealing part 322 and the first end cover 210 and the second end cover 220 have a continuous force in the circumferential direction, so that the second sealing part 322 and the first end cover 210 and the second end cover 220 are continuously contacted in the circumferential direction, thereby realizing the end surface sealing of the triangular rotor pump and preventing the fluid from flowing out of the gap between the triangular rotor 300 and the end cover 200. The sealing member 320 has a simple structure and can realize reliable sealing by being arranged on the rotor body 310. The machining and assembly process is simple.

[0054] In order to realize that the two ends of the first sealing part 321 are both gapless matched with the two second sealing parts 322, in a preferred embodiment, the two ends of each end surface sealing surface and each radial sealing surface intersect. In a specific arrangement, the two ends of the three first sealing parts 321 intersect with the two second sealing parts 322. At this time, the three first sealing parts 321 and the two second sealing parts 322 can be an integral structure.

[0055] The two ends of each end face sealing surface and each radial sealing surface of the above-mentioned triangular rotor pump intersect, so that the two ends of the first sealing part 321 are in close contact with the two second sealing parts 322 respectively, at this time, the first sealing part 321 and the second sealing part 322 are always in contact, there is no gap between the first sealing part 321 and the second sealing part 322 during the rotation of the triangular rotor 300, and then the radial sealing surface and the end face sealing surface are continuous surfaces, so as to ensure the continuity of the radial sealing and the end face sealing, thereby making the sealing effect of the triangular rotor pump better.

[0056] On the basis of the above-mentioned triangular rotor pump, as shown in Figure 2 , Figure 3 and Figure 4 , a preferred embodiment, the first sealing part 321 includes a semicylindrical protrusion 323 protruding from the top end 312, the circumferential outer edge of the semicylindrical protrusion 323 abuts against the inner surface of the side wall 100, and the length direction of the semicylindrical protrusion 323 is consistent with the thickness direction of the top end 312 of the rotor body 310, wherein the length direction of the semicylindrical protrusion 323 is a direction parallel to the axial direction of the eccentric shaft 410, and the thickness direction of the top end 312 of the rotor body 310 is also a direction parallel to the axial direction of the eccentric shaft 410.

[0057] In the above-mentioned triangular rotor pump, by limiting the circumferential outer edge of the semicylindrical protrusion 323 to abut against the inner surface of the side wall 100, the semicylindrical protrusion 323 can be in good contact with the inner surface of the side wall 100, and by limiting the length direction of the semicylindrical protrusion 323 to be consistent with the thickness direction of the top end 312 of the rotor body 310, the semicylindrical protrusion 323 is continuously covered in the thickness direction of the top end 312, thereby ensuring the continuity of the radial sealing of the first sealing part 321 and the top end 312, so that the first sealing part 321 abuts against the inner surface of the side wall 100 during any rotation of the rotor body 310, and then the gap between the adjacent closed spaces is always zero during the entire working process, thereby ensuring the pressure in the closed space, and making the radial sealing effect of the triangular rotor pump better. Of course, the first sealing part 321 is not limited to the semicylindrical structure, but can also be other structural forms, such as a square column, and the structural forms of the three first sealing parts 321 can be the same, such as the three first sealing parts 321 can all be semicylindrical protrusions 323, or the structural forms of the three first sealing parts 321 can be different, such as two first sealing parts 321 can be semicylindrical protrusions 323 and one first sealing part 321 can be a square column, and of course, the specific structural form of the three first sealing parts 321 is determined according to the actual situation of the triangular rotor pump.

[0058] Specifically, as shown in Figure 1 , Figure 3 and Figure 4As shown, the compression amount between the first sealing part 321 and the side wall 100 is 0.1mm-0.5mm, so that the first sealing part 321 is compressed during assembly. The elastic deformation of the first sealing part 321 provides a sealing contact pre-pressure. A continuous force is generated between the first sealing part 321 and the inner surface of the side wall 100 due to the compression deformation of the first sealing part 321, thereby eliminating the gap between the first sealing part 321 and the inner surface of the side wall 100, achieving radial sealing of the triangular rotor pump. Furthermore, by limiting the compression amount between the first sealing part 321 and the side wall 100 to 0.1mm-0.5mm, the abutment action between the first sealing part 321 and the inner surface of the side wall 100 is better achieved, thus improving the radial sealing of the triangular rotor pump. In specific configurations, the compression amount between the first sealing part 321 and the side wall 100 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. The specific value of the compression between the first sealing part 321 and the side wall 100 is determined based on the material of the first sealing part 321, the application scenario, and the actual situation of the side wall 100.

[0059] Specifically, multiple first springs are distributed inside the semi-cylindrical protrusion 323 along the axial direction of the rotor body 310. The elastic direction of each first spring is perpendicular to the inner surface of the sidewall 100. The arrangement of these first springs can, on the one hand, improve the sealing contact between the semi-cylindrical protrusion 323 and the sidewall 100, thereby improving the axial sealing effect; on the other hand, it provides elastic force for switching axial sealing contact. In specific configurations, the number of first springs can be three, four, six, etc., and the multiple first springs can be distributed along the axial direction of the rotor body 310. The first springs can be wave springs, compression springs, or other structural forms. The specific number and structural form of the first springs can be determined based on the material of the first sealing part 321, the application scenario, and the actual conditions of the sidewall 100.

[0060] like Figure 4As shown, in a preferred embodiment, the sealing member 320 comprises two sets of annular elastic members 324, which are arranged at two edge regions of the sealing member 320 close to the first end cover 210 and the second end cover 220 respectively, and each elastic member 324 abuts against the inner wall of the adjacent first end cover 210 or second end cover 220; each set of annular elastic members 324 comprises three elastic edges 800 connected end to end, and the elastic edge 325 can be one sixth, one fourth or one third of the first surface 313, and the specific area of the annular elastic member 324 is determined according to the actual situation of the triangular rotor pump. Each elastic edge 325 is arranged between two adjacent first sealing portions 321, and the elastic edge 325 is connected with the two adjacent first sealing portions 321 respectively, and each elastic edge 325 comprises an abutting surface 326 facing the first end cover 210 or the second end cover 220, which is used to abut against the first end cover 210 and the second end cover 220 to form an end face sealing surface.

[0061] In the above technical solution, the annular elastic member 324 matches the first end cover 210 or the second end cover 220, and the abutting surface 326 is continuously arranged in the circumferential direction of the first end cover 210 or the second end cover 220 to ensure the reliability of the end face sealing; and each set of annular elastic members 324 comprises three elastic edges 325 connected end to end, and each elastic edge 325 comprises an abutting surface 326 facing the first end cover 210 or the second end cover 220 to abut against each other with the first end cover 210 or the second end cover 220, thereby realizing the end face sealing of the triangular rotor pump.

[0062] In the specific arrangement, the abutting surface 326 is arranged at a certain angle with the inner wall of the corresponding first end cover 210 or second end cover 220, and the end of the abutting surface 326 away from the side surface 311 abuts against the inner wall of the corresponding first end cover 210 or second end cover 220 to form an end face sealing surface, at this time, the end face sealing surface is the end surface of the end of the abutting surface 326 away from the side surface 311, and the part of the abutting surface 326 except the end away from the side surface 311 plays a supporting role to provide a continuous force for the end face sealing, so that the end face sealing effect of the triangular rotor pump is better. The certain angle between the abutting surface 326 and the corresponding first end cover 210 or second end cover 220 can be 10°-30°, preferably, the angle is set to 10°, 15°, 20°, 25° or 30°.

[0063] Each elastic edge 325 comprises a groove 327 opened along the extension direction of the elastic edge 325, each groove 327 starts from one first sealing portion 321 and ends at one of the adjacent first sealing portions 321, and the two ends of the groove 327 extend on the part of the first sealing portion 321 at most, and three grooves 327 are arranged in the axial direction of the rotor body 310, and the adjacent two grooves 327 are not connected.

[0064] In the above-mentioned triangular rotor pump, by arranging the grooves 327 on the elastic edge 325, on one hand, the second sealing part 322 is provided with a deformation space, and on the other hand, the grooves 327 can accommodate fluid to push the elastic edge 325 to strengthen the sealing contact, and at the same time, the arching deformation of the sealing member 320 at the joint of the radial sealing and the axial sealing is avoided, and the sealing effect is improved. In addition, part of the grooves 327 extend to the first sealing part 321, and the first sealing part 321 has a part without the grooves 327. The length of the grooves 327 makes the abutting effect of the elastic edge 325 on the first end cover 210 or the second end cover 220 larger, thereby improving the end face sealing effect, and at the same time, the first sealing part 321 and the second sealing part 322 intersect, thereby making the end face sealing surface and the two ends of each radial sealing surface intersect. In addition, during operation, fluid enters the grooves 327, and under the action of fluid pressure, the elastic edge 325 is better attached to the first end cover 210 and the second end cover 220, so as to further improve the end face sealing effect. In specific arrangement, the grooves 327 arranged in the axial direction around the rotor body 310 are not limited to three, but can also be a plurality of arc-shaped grooves arranged at intervals, and these arc-shaped grooves can be uniformly arranged between two adjacent first sealing parts 321, or can be partially arranged on the first sealing part 321, but the arc-shaped grooves located on the first sealing part 321 are not connected. In addition, the number, position and specific structure of the two groups of grooves 327 arranged in the edge regions of the first sealing part 321 along the extension direction thereof are determined according to the actual situation of the triangular rotor pump.

[0065] In specific arrangement, the side wall of the groove 327 towards the first end cover 210 and the second end cover 220 is inclined at a set angle relative to the first surface 313. The set angle can be 10°-30°, preferably, the set angle is 10°, 15°, 20°, 25° or 30°. In order to facilitate the abutting effect of the elastic edge 325 on the first end cover 210 or the second end cover 220, the compression amount of the second sealing part 322 and the first sealing part 321 is 0.1mm-0.5mm. Preferably, the compression amount is 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm. The specific value of the compression amount is determined according to the material, application scene and actual situation of the second sealing part 322 and the first sealing part 321, and the side wall 100 and the end cover 200.

[0066] It is worth noting that the abutting surface 326 can be a flat surface, an arc surface, or a curved surface, and the thickness of the side wall on the side of the elastic edge 325 away from the groove 327 can be the same or gradually increase in the direction towards the eccentric shaft 410. In a specific arrangement, the cross section of the groove 327 can be V-shaped, and the cross-sectional area of the groove 327 gradually decreases in the direction towards the eccentric shaft 410, so that a wedge-shaped fluid pressure is formed when the fluid enters the groove 327 during operation, which can make the elastic edge 325 better adhere to the first end cover 210 or the second end cover 220, and further improve the end face sealing effect of the triangular rotor 300. Of course, the cross section of the groove 327 is not limited to V-shaped, and can also be other shapes with a gradually decreasing cross-sectional area in the direction towards the eccentric shaft 410. In addition, the way in which the cross-sectional area of the groove 327 gradually decreases in the direction towards the inside of the eccentric shaft 410 can be stepwise or other decreasing ways.

[0067] The distance between the ends of the adjacent grooves 327 on each first sealing part 321 is a predetermined distance, which is used to ensure that both radial sealing effect and end face sealing effect are obtained, and the predetermined distance is located at about the middle position of the circumferential direction of the first sealing part 321, so as to facilitate the arrangement of the groove 327. In order to further improve the end face sealing effect of the triangular rotor pump, specifically, the predetermined distance is greater than or equal to 1 / 3 of the width of the first sealing part 321, and less than or equal to 1 / 2 of the width of the first sealing part 321.

[0068] In the above triangular rotor pump, the predetermined distance is set to be between 1 / 3 of the width of the first sealing part 321 and 1 / 2 of the width of the first sealing part 321, so that better end face sealing effect is obtained on the basis of ensuring radial sealing. In a specific arrangement, the predetermined distance can be 1 / 3, 3 / 8, 5 / 12, 11 / 24 of the width of the first sealing part 321. Of course, the predetermined distance is determined according to the actual situation of the above triangular rotor pump.

[0069] Specifically, the groove 327 is provided with a second spring, which is a wave spring arranged along the length direction of the groove 327. The second spring can improve the sealing contact between the elastic edge 325 and the first end cover 210 or the second end cover 220, thereby improving the end face sealing effect, and also provide elastic force for switching the end face sealing contact. In a specific arrangement, the number of second springs can be three, four, six, etc., and the structure of the second spring can be a wave spring, a compression spring, etc. The specific number and structure of the second spring can be determined according to the material and application scenario of the second sealing part 321, and the actual situation of the first end cover 210 and the second end cover 220.

[0070] It is worth noting that the two sets of annular elastic elements 324 can completely cover the first surface 313, or they can be achieved through the setting of grooves 327, such as Figure 3 As shown, only the sidewalls of the groove 327 facing the first end cover 210 and the second end cover 220 are retained. In this case, in order to improve the end face sealing effect, a second spring is provided between the sidewalls of the groove 327 facing the first end cover 210 and the second end cover 220. The second springs are evenly arranged in the circumferential direction of the rotor body 310. The number of second springs can be three, four, six, etc. The second springs can be wave springs, compression springs, etc. The specific number and structure of the second springs can be determined according to the material of the second sealing part 321, the application scenario, and the actual situation of the first end cover 210 and the second end cover 220.

[0071] Specifically, when the seal 320 is an integral structure, and the seal 320 covers the outside of the rotor body 310, in a specific configuration, the seal 320 and the rotor body 310 are integrally formed. In the above-mentioned triangular rotor pump, the seal 320 and the rotor body 310 can be cast in one piece. By limiting the seal 320 and the rotor body 310 to be integrally formed, the processing and assembly process is simplified, while the reliability of the seal can be improved.

[0072] Of course, the processing and assembly method of the triangular rotor 300 is not limited to the above-mentioned form. Other methods are also possible. For example, after the rotor body 310 is injection molded, the seal 320 can be injection molded again on the outside of the rotor body 310. Another example is that the rotor body 310 and the seal 320 can be prepared separately, and then the seal 320 can be assembled onto the outside of the rotor body 310 by hot pressing. In this case, the seal 320 is non-rotatingly fitted onto the outside of the rotor body 310, ensuring sealing reliability while preventing slippage of the seal 320 relative to the rotor body 310 during rotation.

[0073] like Figure 4 As shown, to prevent the seal 320 from slipping relative to the rotor body 310, in a preferred embodiment, the inner wall of the seal 320 is provided with a second surface 3241 for engaging with the first surface 313. This second surface 3241 can be composed of two sets of annular elastic members 324 facing the first surface 313. The engagement of the first surface 313 and the second surface 3241 allows the seal 320 to be non-rotatingly fitted onto the outside of the rotor body 310, preventing slippage of the seal 320 relative to the rotor body 310 during rotation. Specifically, when the first surface 313 is planar, the second surface 3241 is a planar surface engaging with the first surface 313; when the first surface 313 is arc-shaped, the second surface 3241 is an arc-shaped surface engaging with the first surface 313.

[0074] Specifically, the first surface 313 is provided with a plurality of grooves 314, and the annular elastic member 324 is provided with a plurality of protrusions 328 complementary to the grooves 314 on the second surface 3241 of the rotor body 310. The protrusions 328 are matched with the grooves 314, and the protrusions 328 are accommodated in the grooves 314.

[0075] In the above-mentioned triangular rotor pump, the plurality of grooves 314 are uniformly distributed on the outer wall of the triangular rotor 300, the plurality of grooves 314 and the plurality of protrusions 328 are one-to-one corresponding, the grooves 314 and the protrusions 328 are matched, the grooves 314 are square grooves, the protrusions 328 are square columns matched with the square grooves, the protrusions 328 are accommodated in the grooves 314, so that the protrusions 328 and the rotor body 310 are in abutting fit, and the sealing member 320 is non-rotatably connected to the rotor body 310, thereby ensuring the relative fixation between the sealing member 320 and the rotor body 310, preventing the sealing member 320 and the rotor body 310 from moving in the circumferential direction, and avoiding the sliding of the sealing member 320 relative to the rotor body 310, thereby ensuring the sealing effect of the sealing member 320 on the rotor body 310.

[0076] In a specific arrangement, the protrusions 328 can be semicircular cylindrical structures, and the grooves 314 of the first surface 313 are semicircular, but are not limited thereto, and can also be other structural forms, such as square columns. The semicircular cylindrical structures can be entirely arranged in the semicircular grooves 314, or can be partially arranged in the semicircular grooves 314. It is worth noting that the extension direction of the protrusions 328 can be parallel to the axial direction of the rotor body 310, or can be at an angle to the axial direction of the rotor body 310.

[0077] In order to prevent the sealing member 320 and the rotor body 310 from moving in the axial direction, the triangular rotor 300 further comprises an axial limiting structure arranged between the sealing member 320 and the rotor body 310. The axial limiting structure makes the sealing member 320 immovable relative to the rotor body 310 in the axial direction, so as to tightly adhere the sealing member 320 to the rotor body 310, and prevent the sealing member 320 from moving in the axial direction of the rotor body 310 when the triangular rotor 300 rotates.

[0078] The axial limiting structure has various structural forms, such as Figure 2 、 Figure 4 and Figure 5As shown, specifically, the axial limiting structure includes a step structure 315 arranged in the circumferential direction of the rotor body 310 and a slot 329 arranged on the sealing member 320 for cooperating with the step structure 315, the outer diameter of the step structure 315 is smaller than the outer diameter of the central portion of the rotor body 310, the two second sealing portions 322 are connected to each other to form an integral structure, and the slot 329 is formed between the two second sealing portions 322, at this time, the two annular elastic members 324 on the same first surface 313 are in an integral structure, the portion of each annular elastic member 324 opposite to the step structure 315 has a slot 329 cooperating with the step structure 315, and the step structure 315 is clamped in the slot 329 to limit the axial movement of the sealing member 320 relative to the rotor body 310.

[0079] In the above-mentioned triangular rotor pump, by limiting the annular elastic member 324 on the same first surface 313 to be an integral structure, and the integral structure covers the rotor body 310, and at the same time, by limiting the edge region of the rotor body 310 to have a step structure 315, and arranging a slot 329 on the annular elastic member 324 for cooperating with the step structure 315, the sealing member 320 is tightly attached to the rotor body 310, and the outer diameter of the step structure 315 is smaller than the outer diameter of the central portion of the rotor body 310, the cooperation of the step structure 315 and the slot 329 can prevent the axial movement of the sealing member 320, ensure the relative fixation between the sealing member 320 and the rotor body 310, and further improve the sealing effect of the sealing member 320. When specifically arranged, the two sets of step structures 315 on the two end edge regions of the first surface 313 in the axial direction of the rotor body 310 can be symmetrically arranged, and, as shown, Figure 5 As shown, the arrangement of the step structure 315 makes the top end 312 include two portions, the outer diameters of the top ends 312 at the same position in the circumferential direction of the rotor body 310 and in the region of the step structure 315 are smaller than the outer diameter of the top end 312 at the middle position in the axial direction of the rotor body 310, at this time, the inner diameter of the first sealing portion 321 corresponding to the top end 312 in the region of the step structure 315 is smaller than the inner diameter of the top end 312 at the middle position in the axial direction of the rotor body 310, so that the outer diameters of the first sealing portions 321 corresponding to the two portions of the top end 312 are the same, thereby ensuring the radial sealing effect of the triangular rotor pump.

[0080] The structure of the end cover 200 has various forms, in addition to arranging two first end covers 210 and second end covers 220 connected to the side wall 100 respectively, in a preferred embodiment, the side wall 100 is integrally formed with the first end cover 210 or the second end cover 220.

[0081] In the above-mentioned triangular rotor pump, the side wall 100 is integrally formed with the first end cover 210, so that when assembling, only the second end cover 220 needs to be fixed on the side wall 100, thereby reducing the assembling process. Similarly, the side wall 100 is integrally formed with the second end cover 220, so that when assembling, only the first end cover 210 needs to be fixed on the side wall 100, thereby reducing the assembling process. Therefore, by integrally forming the side wall 100 with the first end cover 210 or the second end cover 220, the processing and assembling process is simplified, and the production efficiency is improved.

[0082] In a preferred embodiment, the sealing member 320 can be a polyurethane member or a rubber member.

[0083] In the above-mentioned triangular rotor pump, since polyurethane has the advantages of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, good elasticity, etc., and rubber is a high-elasticity polymer material with reversible deformation, which is elastic at room temperature, can produce large deformation under the action of a small external force, and can restore its original shape after the external force is removed, the sealing member 320 prepared from polyurethane or rubber has good elastic performance, so as to improve the contact force between the sealing member 320 and the inner surface of the side wall 100, the first end cover 210 and the second end cover 220 when abutting, and the sealing of the triangular rotor pump can be better achieved. Preferably, the sealing member 320 can be prepared from self-lubricating polyurethane material, so as to further improve the contact sealing effect between the sealing member 320 and the inner surface of the side wall 100, the first end cover 210 and the second end cover 220. Of course, the elastic material for preparing the sealing member 320 is not limited to polyurethane or rubber, but can also be other materials that meet the requirements.

[0084] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0085] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A tri-rotor pump, comprising a housing, the housing comprising a side wall, a first end cover and a second end cover arranged at two ends of the side wall respectively, a tri-rotor arranged in the housing, and an eccentric assembly driving the tri-rotor, three working chambers being formed between the tri-rotor and the housing, the tri-rotor being capable of being driven to alternately compress and release the working chambers; characterized in that the tri-rotor comprising a rotor body and a sealing member arranged on the rotor body, the sealing member being an elastic structure, the rotor body comprising three top ends and a side surface facing the first end cover and the second end cover respectively, wherein: the sealing member comprises three first sealing portions arranged on the three top ends respectively, each of the first sealing portions abutting against an inner surface of the side wall to form a radial sealing surface separating adjacent working chambers, and the sealing member further comprises two second sealing portions arranged at two ends of the rotor body in an axial direction respectively, each of the second sealing portions abutting against the first end cover and the second end cover to form an end surface sealing surface, and the two ends of each of the first sealing portions are gaplessly matched with the two second sealing portions respectively; the sealing member is non-rotatably sleeved outside the rotor body; the rotor body further comprises a first surface facing the inner surface of the side wall in a circumferential direction, and an inner wall of the sealing member is provided with a second surface for matching with the first surface, the matching of the first surface and the second surface enabling the sealing member to be non-rotatably sleeved outside the rotor body.

2. A gerotor pump according to claim 1, wherein the first sealing portion comprises a semi-cylindrical protrusion protruding from the top end, a length direction of the semi-cylindrical protrusion being consistent with a thickness direction of the top end of the rotor body, and a circumferential outer edge of the semi-cylindrical protrusion abutting against the inner surface of the side wall.

3. A gerotor pump according to claim 2, wherein a first spring is distributed in an inner portion of the semi-cylindrical protrusion in the axial direction of the rotor body, and an elastic direction of the first spring being perpendicular to the inner surface of the side wall.

4. The gerotor pump of claim 1, wherein the second sealing portion comprises two groups of annular elastic members arranged at two edge regions of the sealing member close to the first end cover and the second end cover respectively, and each of the annular elastic members abutting against an inner wall of the first end cover or the second end cover adjacent thereto; each group of annular elastic members comprises three elastic edges connected in a head-to-tail manner, each of the elastic edges being arranged between two adjacent first sealing portions and connected with the two adjacent first sealing portions respectively, and each of the elastic edges comprising an abutting surface facing the first end cover or the second end cover, the abutting surface being used to abut against the first end cover and the second end cover to form the end surface sealing surface.

5. A gerotor pump according to claim 4, characterised in that the abutting surface is arranged at a preset angle with the inner wall of the corresponding first end cover or second end cover, and an end of the abutting surface away from the side surface abuts against the inner wall of the corresponding first end cover or second end cover.

6. A gerotor pump according to claim 4, wherein Each of the elastic edges comprises a groove opened along the extension direction of the elastic edge, each of the grooves starts from one of the first sealing parts and ends at one of the adjacent first sealing parts, and both ends of the groove at least partially extend to the first sealing part, three of the grooves are arranged around the circumference of the rotor body, and the adjacent two of the grooves are not connected.

7. A gerotor pump according to claim 6, characterised in that The distance between the ends of the adjacent grooves on each of the first sealing parts is a preset distance, which is approximately at the middle position in the circumferential direction of the first sealing part.

8. A gerotor pump according to claim 7, characterised in that The preset distance is greater than or equal to 1 / 3 of the width of the first sealing part and less than or equal to 1 / 2 of the width of the first sealing part.

9. A gerotor pump according to claim 6, wherein The groove is provided with a second spring, the second spring is a wave spring, and the wave spring is arranged along the length direction of the groove.

10. The gerotor pump of claim 1, wherein The sealing member is of an integrated structure and is wrapped outside the rotor body.

11. A gerotor pump according to claim 1, wherein The first surface is provided with a plurality of grooves, the second surface of the sealing member is provided with a plurality of convex parts complementary to the grooves, the convex parts are matched with the grooves and are accommodated in the grooves to make the sealing member non-rotatably connected to the rotor body.

12. The gerotor pump of claim 1, wherein The triangular rotor further comprises an axial limiting structure arranged between the sealing member and the rotor body, the axial limiting structure makes the sealing member non-movable in the axial direction relative to the rotor body.

13. A gerotor pump according to claim 12, characterised in that The axial limiting structure comprises a step structure arranged around the circumference of the rotor body and a slot arranged on the sealing member for cooperating with the step structure, the two second sealing parts are integrally connected, and the slot cooperating with the step structure is formed between the two second sealing parts, when the sealing member is sleeved on the rotor body, the step structure is clamped in the slot to limit the axial movement of the sealing member relative to the rotor body.

14. The gerotor pump of claim 1, wherein The elastic material of the sealing member is polyurethane or rubber.

15. The gerotor pump of claim 1, wherein, Both ends of each of the end face sealing surfaces and each of the radial sealing surfaces intersect.

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