An oil-water separation structure and a water pump

Abstract

The present invention provides an oil-water separation structure, which includes a plunger, a cylinder block, and a diaphragm. The cylinder block is provided with a sealed inner cavity, the diaphragm is disposed in the sealed inner cavity, the plunger passes through the sealed inner cavity. The diaphragm includes a sealing outer ring, a sealing inner ring, and a connecting portion. The sealing outer ring and the sealing inner ring are connected by the connecting portion. The sealing outer ring is sealingly connected to the cylinder block, the sealing inner ring is sealingly connected to the plunger, and the connecting portion has elasticity. The present invention provides a water pump, which includes a cylinder block, a linkage device, at least one plunger, and at least one diaphragm. In the present invention, the diaphragm is sealingly connected between the plunger and the cylinder block. When the plunger makes a linear reciprocating movement, the sealing inner ring moves along with it. The connection between the sealing outer ring and the sealing inner ring is realized through the elastic connecting portion, achieving relative static between the sealing inner ring and the plunger, avoiding the occurrence of sliding friction phenomenon, reducing the aging and wear of the sealing inner ring, thereby achieving a good oil-water separation effect and having a long service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pump seals, and particularly relates to an oil-water separation structure and a water pump. Background Art

[0002] The high-pressure water pump spraying method is a method with relatively low noise, low energy consumption, and large spraying volume among modern fog-making methods, and is widely used in fields such as factory humidification and cooling, agricultural greenhouse humidification, pesticide spraying, garden spraying and landscaping, public area dust reduction, and indoor humidification. Especially in the environment of a possible global outbreak of infectious diseases, in addition to having the function of spray humidification, the high-pressure water pump spraying also needs to spray disinfectant to achieve large-area disinfection.

[0003] Whether it is spray humidification or spraying disinfectant, during the operation of the high-pressure water pump, no matter which method including crankshaft type, eccentric wheel type, swash plate type, etc. is used to convert the rotational motion of the motor into a reciprocating motion, the problem of separating lubricating oil and water needs to be faced. Since the transmission mechanism in the water pump works immersed in lubricating oil, and the liquid such as water or disinfectant needs to be pressurized during the working process, the seal between the oil chamber and the water chamber in the water pump is very important. If the sealing effect between the oil chamber and the water chamber is poor, when the lubricating oil in the oil chamber seeps into the water or disinfectant liquid in the water chamber, first, the problem of reduced lubricating oil occurs, and second, the lubricating oil is sprayed into the room along with the spray. If inhaled into the lungs by people, this kind of mist containing it will cause great harm to the lungs and even cause cardiovascular diseases such as blood vessel blockage. With people paying more and more attention to their own health and having higher and higher requirements for the environment, it is urgent to solve such problems.

[0004] Refer to Figure 1 , but in the current prior art, generally corresponding sealing rubber rings 9 are respectively arranged on the oil chamber and the water chamber, and the sealing rubber rings 9 at both ends are pressed and sealed by relying on the connection of the cylinder block 2. However, under the long-term friction of the plunger 1, since the sliding friction occurs between the plunger 1 and the sealing rubber ring 9, that is, the sealing rubber ring 9 remains stationary, and the plunger 1 reciprocates back and forth on the inner surface of the sealing ring. During the high-speed reciprocating motion of the plunger 1, a very thin oil film will be carried on the surface of the sealing rubber ring 9, and the oil film will be mixed with the liquid in the water chamber, and the sealing rubber ring 9 will gradually wear, the sealing effect becomes poor, and the oil-water separation effect is even worse, and the hidden danger of oil leakage cannot be eliminated. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide an oil-water separation structure and a water pump, which solve the problem of wear and oil leakage of the sealing ring caused by the sliding friction between the plunger and the sealing ring in the prior art, and overcome the defect of poor oil-water separation effect.

[0006] The present invention provides an oil-water separation structure, which includes a plunger, a cylinder block and a diaphragm. The cylinder block is provided with a sealed inner cavity. The diaphragm is arranged in the sealed inner cavity. The plunger penetrates through the sealed inner cavity. The diaphragm includes a sealed outer ring, a sealed inner ring and a connecting part. The sealed outer ring and the sealed inner ring are connected by the connecting part. The sealed outer ring is sealingly connected to the cylinder block, and the sealed inner ring is sealingly connected to the plunger. The connecting part has elasticity.

[0007] Further, the sealing surface between the sealed outer ring and the cylinder block is arranged on the inner wall of the sealed inner cavity.

[0008] Further, it further includes a sealing ring. A groove is arranged on the inner wall of the sealed outer ring. The sealing ring is embedded in the groove. The outer diameter of the sealed outer ring is equal to the diameter of the sealed inner cavity. The outer diameter of the sealing ring is greater than the diameter of the outermost edge of the annular installation space surrounded by the groove.

[0009] Further, the inner diameter of the sealing ring is equal to the inner diameter of the sealed outer ring.

[0010] Further, the outer diameter of the sealed outer ring is D11, the thickness of the diaphragm is t, the diameter d12 of the outermost edge of the annular installation space surrounded by the groove = D11 - 2t, the inner diameter D13 of the sealed outer ring = D11 - 4t, the outer diameter D12 of the sealing ring = D11 - t, the inner diameter of the sealing ring is equal to D13, and the diameter of the sealed inner cavity is equal to D11.

[0011] Further, the cylinder block includes a low-pressure cylinder, a high-pressure cylinder and a sealing seat. The low-pressure cylinder and the high-pressure cylinder are sealingly connected through the sealing seat.

[0012] Further, the sealing surface between the sealed outer ring and the cylinder block is arranged on the end face of the sealing seat.

[0013] Further, it further includes a sealing ring. The sealed outer ring is provided with a sealing convex ring extending horizontally outwards. One end of the sealing ring abuts against the end face of the sealed inner cavity, and the other end of the sealing ring abuts against the sealing convex ring. The sealing convex ring is tightly connected to the sealing seat.

[0014] Further, the outer diameter of the sealing convex ring is D21, the thickness of the diaphragm is t, the outer diameter D22 of the sealed outer ring = D21 - 2t, the inner diameter D23 of the sealed outer ring = D21 - 4t, the outer diameter D24 of the sealing ring is less than or equal to D21, and the inner diameter of the sealing ring is equal to D22.

[0015] Further, in the installed state, the compression amount of the sealing ring on the sealing convex ring is t / 2.

[0016] Further, the outer diameter of the plunger is D3, the inner diameter of the inner sealing ring is D41, and D41 is less than or equal to D3.

[0017] Further, the inner diameter D41 of the inner sealing ring is two-thirds of the outer diameter D3 of the plunger.

[0018] Further, the thickness of the diaphragm is t, and the outer diameter D42 of the inner sealing ring = D41 + 4t.

[0019] Further, a tightening ring is further included. A tightening groove is provided on the outer wall of the inner sealing ring. The tightening ring is embedded in the tightening groove, and the inner diameter of the tightening ring is less than the diameter of the annular ring surrounded by the bottom of the tightening groove.

[0020] Further, the outer diameter of the tightening ring is equal to the outer diameter of the inner sealing ring.

[0021] Further, the thickness of the diaphragm is t, the inner diameter D41 of the inner sealing ring is equal to the outer diameter D3 of the plunger, the diameter d42 of the annular ring surrounded by the bottom of the tightening groove = D41 + 3t, the outer diameter D43 of the inner sealing ring = D41 + 4t, the inner diameter D42 of the tightening ring = D41 + 2t, and the outer diameter of the tightening ring is equal to D43.

[0022] Further, sealing protrusions are provided on the inner wall of the inner sealing ring, and the sealing protrusions are evenly distributed on the inner wall of the inner sealing ring.

[0023] Further, a limiting groove is provided on the outer wall of the plunger. At least a part of the inner sealing ring coincides with the limiting groove, and the coincident part of the inner sealing ring is embedded in the limiting groove.

[0024] In a second aspect, the present invention provides a water pump, which includes a cylinder block, a linkage device, at least one plunger and at least one diaphragm. At least one sealed inner cavity is provided in the cylinder block. Each sealed inner cavity is connected to a corresponding plunger. The plunger and the sealed inner cavity are hermetically connected through the diaphragm. The linkage device is connected to the plunger, and the linkage device drives the plunger to make a linear reciprocating movement in the sealed inner cavity.

[0025] Further, the cylinder block includes a low-pressure cylinder, a high-pressure cylinder and a sealing seat. The sealing seat is embedded in the connecting surface of the high-pressure cylinder. A through hole is provided in the sealing seat. The plunger passes through the through hole. The low-pressure cylinder and the high-pressure cylinder are hermetically connected through the sealing seat.

[0026] Advantages of the present invention:

[0027] The present invention provides an oil-water separation structure and a water pump. A diaphragm is sealingly connected between a plunger and a cylinder block. Among them, an outer sealing ring is sealingly connected to the cylinder block, and an inner sealing ring is sealingly connected to the plunger. When the plunger makes a linear reciprocating movement, the inner sealing ring moves together with it. The connection between the outer sealing ring and the inner sealing ring is realized through an elastic connecting part, achieving relative rest between the inner sealing ring and the plunger, avoiding the occurrence of sliding friction, reducing the aging and wear of the inner sealing ring. And within a reasonable elastic deformation range of the connecting part, the time to reach fatigue aging through this bending deformation is very long and can be ignored, thereby achieving a good oil-water separation effect and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0029] Figure 1 is a schematic cross-sectional view of the mating structure between a plunger and a sealing rubber ring in the prior art.

[0030] Figure 2 is a schematic cross-sectional view of an implementation manner of the outer sealing ring and the cylinder block in an oil-water separation structure of Embodiment 1 of the present invention.

[0031] Figure 3 is in Figure 2 the schematic cross-sectional view of the diaphragm in the implementation manner.

[0032] Figure 4 is in Figure 2 the schematic cross-sectional view of the sealing ring in the implementation manner.

[0033] Figure 5 is in Figure 2 the enlarged schematic view of the partial structure of part A in the implementation manner.

[0034] Figure 6 is a schematic cross-sectional view of another implementation manner of the outer sealing ring and the cylinder block in an oil-water separation structure of Embodiment 1 of the present invention.

[0035] Figure 7 is in Figure 6 the schematic cross-sectional view of the diaphragm in the implementation manner.

[0036] Figure 8 is in Figure 6 the schematic cross-sectional view of the sealing ring in the implementation manner.

[0037] Figure 9 is in Figure 6Schematic diagram of the enlarged partial structure of part B in the embodiment. It is also necessary to ensure the sealing effect between the sealing inner ring 32 of the diaphragm 3 and the plunger 1.

[0038] Figure 10 It is a schematic cross-sectional structure diagram of an implementation manner of the sealing inner ring and the plunger in an oil-water separation structure of Embodiment 1.

[0039] Figure 11 It is a schematic cross-sectional structure diagram of another implementation manner of the sealing inner ring and the plunger in an oil-water separation structure of Embodiment 1.

[0040] Figure 12 It is in Figure 11 Schematic cross-sectional structure diagram of the diaphragm in the embodiment.

[0041] Figure 13 It is in Figure 11 Schematic cross-sectional structure diagram of the tightening ring in the embodiment.

[0042] Figure 14 It is a schematic cross-sectional structure diagram of the plunger at the highest stroke in an oil-water separation structure of Embodiment 1.

[0043] Figure 15 It is a schematic cross-sectional structure diagram of the plunger at the lowest stroke in an oil-water separation structure of Embodiment 1.

[0044] Figure 16 It is a schematic cross-sectional structure diagram of a water pump in Embodiment 2. Specific implementation manners

[0045] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] Embodiment 1:

[0048] Referring toFigures 2 to 15 , Embodiment 1 provides an oil-water separation structure, including a plunger 1, a cylinder block 2 and a diaphragm 3. The cylinder block 2 is provided with a sealed inner cavity 4, the diaphragm 3 is arranged in the sealed inner cavity 4, the plunger 1 penetrates through the sealed inner cavity 4. The diaphragm 3 includes a sealing outer ring 31, a sealing inner ring 32 and a connecting portion 33. The sealing outer ring 31 and the sealing inner ring 32 are connected by the connecting portion 33. The sealing outer ring 31 is hermetically connected to the cylinder block 2, the sealing inner ring 32 is hermetically connected to the plunger 1, and the connecting portion 33 has elasticity.

[0049] It should be noted that, inside the cylinder block 2, in the sealed inner cavity 4, the diaphragm 3 is hermetically connected to both the cylinder block 2 and the plunger 1 at the same time. The oil film on the plunger 1 is isolated by the sealing inner ring 32, preventing lubricating oil from seeping into the water chamber. Therefore, the diaphragm 3 also separates the oil chamber and the water chamber in the cylinder block 2. When the plunger 1 makes a linear reciprocating movement, the sealing inner ring 32 moves along with it. More specifically, referring to Figure 14 , when the plunger 1 moves towards the water chamber side and the stroke of the plunger 1 reaches the highest position, the bending deformation amount of the connecting portion 33 is the largest; referring to Figure 15 , when the plunger 1 moves towards the oil chamber side and the stroke of the plunger 1 reaches the lowest position, the bending deformation amount of the connecting portion 33 is the smallest. During the change process of the highest position stroke and the lowest position stroke, the connecting portion 33 continuously undergoes reciprocating elastic deformation, and the bending deformation amount changes back and forth between the maximum and the minimum. The connection between the sealing outer ring 31 and the sealing inner ring 32 is realized through the elastic connecting portion 33, achieving the relative rest between the sealing inner ring 32 and the plunger 1. No matter what state the plunger 1 is in, the sealing inner ring 32 of the diaphragm 3 remains relatively stationary with the plunger 1, without wear, avoiding the occurrence of sliding friction phenomenon, reducing the aging and wear of the sealing inner ring 32. And the connecting portion 33 is within a reasonable elastic deformation range, and the time to reach fatigue aging through this bending deformation is very long and can be ignored, thereby achieving a good oil-water separation effect and a long service life. Additionally, the overall material of this diaphragm 3 can be integrally formed with soft rubber, having functions such as elasticity, toughness, and sealing performance, and adapting to the situation where the connecting portion 33 undergoes a large number of reciprocating deformations.

[0050] Among them, the sealing method between the sealing outer ring 31 of the diaphragm 3 and the cylinder block 2 can be divided into two types:

[0051] Referring to Figures 2 to 5 , as an implementation manner, the sealing surface between the sealing outer ring 31 and the cylinder block 2 is arranged on the inner wall of the sealed inner cavity 4. The outer wall surface of the sealing outer ring 31 is tightly connected to the inner wall of the sealed inner cavity 4. The sealing surface is parallel to the direction of the linear movement of the plunger 1 and is a curved surface.

[0052] In this embodiment, in order to increase the pressing force on this sealing surface and improve the sealing effect, this oil-water separation structure further includes a sealing ring 51. A groove 52 is provided on the inner wall of the outer sealing ring 31. The sealing ring 51 is embedded in the groove 52. The outer diameter of the outer sealing ring 31 is equal to the diameter of the sealing inner cavity 4. The outer diameter of the sealing ring 51 is greater than the diameter of the outermost edge of the annular installation space surrounded by the groove 52. That is, the outer diameter of the outer sealing ring 31 is tightly connected to the diameter of the sealing inner cavity 4. In the direction of the inner wall of the outer sealing ring 31, by clamping the sealing ring 51, since the outer diameter of this sealing ring 51 is greater than the diameter of the outermost edge of the annular installation space surrounded by the groove 52, the sealing ring 51 will squeeze the outer sealing ring 31 on the corresponding back surface of the groove 52. Through this pressing force, the outer sealing ring 31 is tightly pressed against the inner wall of the sealing inner cavity 4.

[0053] As a preferred method, the inner diameter of the sealing ring 51 is equal to the inner diameter of the outer sealing ring 31. That is, in the installed state, the inner wall of the outer sealing ring 31 and the inner wall of the sealing ring 51 are in the same plane, smooth and flush on this mating surface, and no interference will occur.

[0054] More specifically, the outer diameter of the outer sealing ring 31 is D11, the material thickness of the diaphragm 3 is t, the diameter d12 of the outermost edge of the annular installation space surrounded by the groove 52 = D11 - 2t, the inner diameter D13 of the outer sealing ring 31 = D11 - 4t, the outer diameter D12 of the sealing ring 51 = D11 - t, the inner diameter of the sealing ring 51 is equal to D13, the diameter of the sealing inner cavity 4 is equal to D11, the compression amount of the sealing ring 51 on the outer sealing ring 31 is t / 2, and the sealing ring 51 exerts pressure on the outer sealing ring 31 along its outer ring for one circle. That is, the thickness of the outer sealing ring 31 after unilateral compression is t / 2.

[0055] Refer to Figures 6 to 9 , as another embodiment, the cylinder block 2 includes a low-pressure cylinder 21, a high-pressure cylinder 22 and a sealing seat 23. The low-pressure cylinder 21 and the high-pressure cylinder 22 are sealed and connected through the sealing seat 23. Water or disinfectant flows in the high-pressure cylinder 22 to provide pressure for the water or disinfectant. The power of the plunger 1 is supplied in the low-pressure cylinder 21. The plunger 1 straddles the low-pressure cylinder 21 and the high-pressure cylinder 22. The connection surfaces of the low-pressure cylinder 21 and the high-pressure cylinder 22 separate the oil chamber and the water chamber. The sealing seat 23 is embedded at the connection surface of the high-pressure cylinder 22. The sealing seat 23, the low-pressure cylinder 21 and the plunger 1 jointly enclose the sealing inner cavity 4. The sealing surface between the outer sealing ring 31 and the cylinder block 2 is provided at the end surface of the sealing seat 23. That is, this sealing surface is perpendicular to the direction of the linear movement of the plunger 1 and is a plane.

[0056] In this embodiment, in order to increase the pressing force on this sealing surface and improve the sealing effect, this oil-water separation structure further includes a sealing ring 61. The sealing outer ring 31 is provided with a sealing convex ring 62 extending in the horizontal outward direction, and this extending direction is perpendicular to the linear movement direction of the plunger 1. One end of the sealing ring 61 abuts against the end face of the sealing inner cavity 4, and the other end of the sealing ring 61 abuts against the sealing convex ring 62. The sealing convex ring 62 is tightly connected to the sealing seat 23. During the installation process, first place the sealing ring 61 in the sealing inner cavity 4 of the low-pressure cylinder 21, and then place the diaphragm 3. At this time, the sealing convex ring 62 of the sealing outer ring 31 of the diaphragm 3 cooperates with the outer end of the sealing ring 61 facing outward. When closing the high-pressure cylinder 22, under the extrusion of the high-pressure cylinder 22 and the sealing ring 61, the sealing seat 23 and the sealing convex ring 62 are in interference fit. By pressing the sealing convex ring 62, the sealing effect is improved, and the installation is convenient and the effect is good.

[0057] More specifically, the outer diameter of the sealing convex ring 62 is D21, the material thickness of the diaphragm 3 is t, the outer diameter D22 of the sealing outer ring 31 = D21 - 2t, the inner diameter D23 of the sealing outer ring 31 = D21 - 4t, the outer diameter D24 of the sealing ring 61 is less than or equal to D21, the diameter of the sealing inner cavity 4 is equal to D21, the inner diameter of the sealing ring 61 is equal to D22, the inner diameter of the sealing ring 61 is the same as the outer diameter of the sealing outer ring 31, and the material thickness of the sealing ring 61 is also t. Further, in the installed state, the compression amount of the sealing ring 61 on the sealing convex ring 62 is t / 2, and the compression deformation direction of this compression amount is the same as the linear movement direction of the plunger 1.

[0058] In this embodiment, in addition to ensuring the sealing effect between the sealing outer ring 31 of the diaphragm 3 and the cylinder block 2, it is also necessary to ensure the sealing effect between the sealing inner ring 32 of the diaphragm 3 and the plunger 1. The sealing method between the sealing inner ring 32 of the diaphragm 3 and the plunger 1 can be divided into two types:

[0059] Refer to Figure 10 , as an implementation manner, the outer diameter of the plunger 1 is D3, the inner diameter of the sealing inner ring 32 is D41, and D41 is less than or equal to D3. By utilizing the elastic characteristics of the diaphragm 3, the inner diameter of the sealing inner ring 32 is set to be less than or equal to the outer diameter of the plunger 1, so that a tight connection is maintained between the sealing inner ring 32 and the plunger 1.

[0060] Preferably, the inner diameter D41 of the sealing inner ring 32 is two-thirds of the outer diameter D3 of the plunger 1. Under this parameter, the tightness of the sealing inner ring 32 is high and the elastic deformation range is appropriate.

[0061] Preferably, the material thickness of the diaphragm 3 is t, and the outer diameter D42 of the sealing inner ring 32 = D41 + 4t.

[0062] Refer to Figures 11 to 13, As another implementation, in order to improve the sealing effect between the sealing inner ring 32 and the plunger 1, this oil-water separation structure further includes a tightening ring 71. Similarly, based on the principle of external force reinforcement, a tightening groove 72 is provided on the outer wall of the sealing inner ring 32. The tightening ring 71 is embedded in the tightening groove 72. The inner diameter of the tightening ring 71 is smaller than the diameter of the annular ring surrounded by the bottom of the tightening groove 72. By applying pressure to the tightening groove 72 of the sealing inner ring 32 with the smaller-diameter tightening ring 71, the sealing strength between the sealing inner ring 32 and the plunger 1 is ensured.

[0063] Preferably, the outer diameter of the tightening ring 71 is equal to the outer diameter of the sealing inner ring 32. On this mating surface, it is smooth and flush, without interference.

[0064] Preferably, the thickness of the diaphragm 3 is t. The inner diameter D41 of the sealing inner ring 32 is equal to the outer diameter D3 of the plunger 1. The diameter d42 of the annular ring surrounded by the bottom of the tightening groove 72 = D41 + 3t. The outer diameter D43 of the sealing inner ring 32 = D41 + 4t. The inner diameter D42 of the tightening ring 71 = D41 + 2t. The outer diameter of the tightening ring 71 is equal to D43. The compression amount of the tightening ring 71 on the sealing inner ring 32 is t / 2. And the tightening ring 71 applies pressure to the sealing inner ring 32 along one circle of its inner ring, that is, the thickness of the sealing inner ring 32 after unilateral compression is t.

[0065] As a preferred method, the sealing ring 51 and the sealing ring 61 for the sealing outer ring 31, and the tightening ring 71 for the sealing inner ring 32 are all made of stainless steel material, with fixed dimensions and reliable strength.

[0066] Refer to Figure 10 , As a preferred method, sealing protrusions 73 are provided on the inner wall of the sealing inner ring 32. The sealing protrusions 73 are evenly distributed on the inner wall of the sealing inner ring 32. In order to increase the friction coefficient between the sealing inner ring 32 and the plunger 1, the resistance is increased through these sealing protrusions 73.

[0067] As a preferred method, a limiting groove is provided on the outer wall of the plunger 1. At least a part of the sealing inner ring 32 coincides with the limiting groove. The coincident part of the sealing inner ring 32 is embedded in the limiting groove. By being embedded in this limiting groove, the relative sliding between the sealing inner ring 32 and the plunger 1 is further prevented. Correspondingly, the tightening ring 71 can also be relatively provided outside this limiting groove.

[0068] Example 2:

[0069] Refer to Figure 16, this embodiment provides a water pump, which includes a cylinder block 2, a linkage device, at least one plunger 1 and at least one diaphragm 3. There is at least one sealed inner cavity 4 in the cylinder block 2. Each sealed inner cavity 4 is connected to the corresponding plunger 1. The plunger 1 and the sealed inner cavity 4 are hermetically connected through the diaphragm 3. The linkage device is connected to the plunger 1, and the linkage device drives the plunger 1 to make a linear reciprocating movement in the sealed inner cavity 4. Among them, the specific situation of the hermetic connection between the diaphragm 3 and the plunger 1 and the cylinder block 2 is as described in Embodiment 1 and will not be further elaborated here.

[0070] As an implementation manner, the cylinder block 2 includes a low-pressure cylinder 21, a high-pressure cylinder 22 and a seal seat 23. The low-pressure cylinder 21 and the high-pressure cylinder 22 are hermetically connected through the seal seat 23. Water or disinfectant flows in the high-pressure cylinder 22 to provide pressure for the water or disinfectant. The low-pressure cylinder 21 is for the power drive of the plunger 1. The plunger 1 straddles the low-pressure cylinder 21 and the high-pressure cylinder 22. The connection surface of the low-pressure cylinder 21 and the high-pressure cylinder 22 separates the oil cavity and the water cavity. The seal seat 23 is embedded in the connection surface of the high-pressure cylinder 22. There is a through hole in the seal seat 23, and the plunger 1 passes through the through hole. The low-pressure cylinder 21 and the high-pressure cylinder 22 are hermetically connected through the seal seat 23.

[0071] Correspondingly, the linkage device includes a motor 81, a bearing 82, a transmission shaft 83 and a swash plate 84. The motor 81 is connected to the transmission shaft 83, and the swash plate 84 is fixed on the transmission shaft 83. The connecting shaft is connected to the low-pressure cylinder 21 through the bearing 82. The inclined surface of the swash plate 84 abuts against the end of each plunger 1.

[0072] Of course, in addition to being applied to the plunger type water pump, this oil-water separation structure can also be provided to other types of water pumps that require oil-water separation.

[0073] Compared with the prior art, the present invention provides an oil-water separation structure and a water pump. The diaphragm 3 is hermetically connected between the plunger 1 and the cylinder block 2. Among them, the outer seal ring 31 is hermetically connected to the cylinder block 2, and the inner seal ring 32 is hermetically connected to the plunger 1. When the plunger 1 makes a linear reciprocating movement, the inner seal ring 32 moves together. The connection between the outer seal ring 31 and the inner seal ring 32 is realized through the elastic connecting portion 33, realizing the relative static between the inner seal ring 32 and the plunger 1, avoiding the occurrence of sliding friction phenomenon, reducing the aging and wear of the inner seal ring 32. And the connecting portion 33 is within a reasonable elastic deformation range, and the time to reach fatigue aging through this bending deformation is very long and can be ignored, so as to achieve a good oil-water separation effect and a long service life.

[0074] Finally, it should be emphasized that the present invention is not limited to the above embodiments. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil-water separation structure, characterized in that, It includes a plunger, a cylinder block and a diaphragm. The cylinder block is provided with a sealed inner cavity. The diaphragm is arranged in the sealed inner cavity. The plunger passes through the sealed inner cavity. The diaphragm includes a sealed outer ring, a sealed inner ring and a connecting part. The sealed outer ring and the sealed inner ring are connected by the connecting part. The sealed outer ring is hermetically connected to the cylinder block. The sealed inner ring is hermetically connected to the plunger. The connecting part has elasticity; During the change process of the highest position stroke and the lowest position stroke of the plunger, the connecting part undergoes reciprocating elastic deformation, and its bending deformation amount changes back and forth between the maximum and the minimum; The cylinder block includes a low-pressure cylinder, a high-pressure cylinder and a sealing seat. The low-pressure cylinder and the high-pressure cylinder are hermetically connected through the sealing seat; The sealing surface between the sealed outer ring and the cylinder block is arranged on the end surface of the sealing seat; It further includes a sealing ring. The sealed outer ring is provided with a sealing convex ring extending horizontally outwards. One end of the sealing ring abuts against the end surface of the sealed inner cavity, and the other end of the sealing ring abuts against the sealing convex ring. The sealing convex ring is tightly connected to the sealing seat; The outer diameter of the sealing convex ring is D21, the material thickness of the diaphragm is t, the outer diameter D22 of the sealed outer ring = D21 - 2t, the inner diameter D23 of the sealed outer ring = D21 - 4t, the outer diameter D24 of the sealing ring is less than or equal to D21, and the inner diameter of the sealing ring is equal to D22; In the installed state, the compression amount of the sealing ring on the sealing convex ring is t / 2.

2. The oil-water separation structure according to claim 1, characterized in that, The outer diameter of the plunger is D3, the inner diameter of the sealed inner ring is D41, and D41 is less than or equal to D3.

3. The oil-water separation structure according to claim 2, characterized in that The inner diameter D41 of the sealed inner ring is two-thirds of the outer diameter D3 of the plunger.

4. The oil-water separation structure according to claim 2, characterized in that, It further includes a tightening ring. The outer wall of the sealed inner ring is provided with a tightening groove. The tightening ring is embedded in the tightening groove, and the inner diameter of the tightening ring is less than the diameter of the annular ring surrounded by the bottom of the tightening groove.

5. The oil-water separation structure according to claim 4, characterized in that, The outer diameter of the tightening ring is equal to the outer diameter of the sealed inner ring.

6. The oil-water separation structure according to claim 5, characterized in that, The material thickness of the diaphragm is t, the inner diameter D41 of the sealed inner ring is equal to the outer diameter D3 of the plunger, the outer diameter of the sealed inner ring is D43, and the outer diameter of the tightening ring is equal to D43.

7. An oil-water separation structure according to any one of claims 3 to 6, characterized in that, The inner wall of the sealed inner ring is provided with sealing protrusions, and the sealing protrusions are evenly distributed on the inner wall of the sealed inner ring.

8. An oil-water separation structure according to any one of claims 3 to 6, characterized in that, A limiting groove is arranged on the outer wall of the plunger. At least a part of the sealed inner ring coincides with the limiting groove, and the coincident part of the sealed inner ring is embedded in the limiting groove.

9. A water pump applying an oil-water separation structure according to any one of claims 1 to 8, characterized in that, It includes a cylinder block, a linkage device, at least one plunger and at least one diaphragm. At least one sealed inner cavity is arranged in the cylinder block. Each sealed inner cavity is connected to a corresponding plunger. The plunger and the sealed inner cavity are hermetically connected through the diaphragm. The linkage device is connected to the plunger, and the linkage device drives the plunger to make a linear reciprocating movement in the sealed inner cavity.

10. A water pump according to claim 9, characterized in that, The cylinder block includes a low-pressure cylinder, a high-pressure cylinder and a sealing seat. The sealing seat is embedded in the connecting surface of the high-pressure cylinder. A through hole is arranged in the sealing seat. The plunger passes through the through hole. The low-pressure cylinder and the high-pressure cylinder are hermetically connected through the sealing seat.

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