CN215633558U - Oil-water separation structure and water pump - Google Patents

Abstract

The utility model provides an oil-water separation structure which comprises a plunger, a cylinder body and a diaphragm, wherein the cylinder body 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 comprises a sealed outer ring, a sealed inner ring and a connecting part, the sealed outer ring and the sealed inner ring are connected through the connecting part, the sealed outer ring is connected with the cylinder body in a sealing mode, the sealed inner ring is connected with the plunger in a sealing mode, and the connecting part has elasticity. The utility model provides a water pump which comprises a cylinder body, a linkage device, at least one plunger and at least one diaphragm. According to the utility model, the diaphragm is hermetically connected between the plunger and the cylinder body, when the plunger linearly reciprocates, the sealing inner ring moves along with the plunger, the connection between the sealing outer ring and the sealing inner ring is realized through the elastic connecting part, the relative rest between the sealing inner ring and the plunger is realized, the sliding friction phenomenon is avoided, the aging and abrasion conditions of the sealing inner ring are reduced, the good oil-water separation effect is realized, and the service life is long.

Description

Oil-water separation structure and water pump

Technical Field

The utility model belongs to the technical field of water pump sealing, and particularly relates to an oil-water separation structure and a water pump.

Background

The high-pressure water pump spraying method belongs to a method with low relative noise, low energy consumption and large spraying amount in the modern mist making method, and is widely applied to the fields of factory humidification and cooling, agricultural greenhouse humidification, pesticide spraying, garden spraying and landscape making, public area dust fall, indoor humidification and the like. The high-pressure water pump needs to have a spraying and humidifying function, and needs to spray disinfectant to realize large-area disinfection.

No matter spray humidification or spray disinfection solution, in the operation of the high-pressure water pump, no matter any mode including crankshaft type, eccentric wheel type and inclined disc type is adopted to convert the rotation action of the motor into reciprocating action, the problem that lubricating oil and water are required to be separated is faced, because a transmission mechanism in the water pump is soaked in the lubricating oil to work, and in the working process, liquid such as water or disinfection solution is required to be pressurized, the sealing between an oil cavity and a water cavity in the water pump is very important, if the sealing effect between the oil cavity and the water cavity is poor, when the lubricating oil in the oil cavity is infiltrated into the liquid such as water or disinfection solution in the water cavity, firstly, the problem of lubricating oil reduction is caused, secondly, the lubricating oil is sprayed into a room along with spray, if the lubricating oil is sucked into the lung by a person, the contained mist can cause great harm to the lung, even can cause cardiovascular diseases such as vessel blockage, with the increasing importance of people on their health and the increasing environmental requirements, there is an urgent need to solve such problems.

Referring to fig. 1, in the prior art, corresponding seal rubber rings 9 are generally arranged on an oil cavity and a water cavity respectively, and the seal rubber rings 9 at two ends are connected against a cylinder body 2 to realize press-fit sealing, but under long-term friction of a plunger 1, because sliding friction occurs between the plunger 1 and the seal rubber rings 9, that is, the seal rubber rings 9 are kept still, the plunger 1 rubs back and forth on the surface of an inner ring of the seal ring, during high-speed reciprocating motion of the plunger 1, a very thin oil film is carried on the surface of the seal rubber rings 9, the oil film is mixed with liquid in the water cavity, the seal rubber rings 9 are gradually worn, the sealing effect is poor, the oil-water separation effect is worse, and the hidden danger of oil leakage cannot be eliminated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, provides an oil-water separation structure and a water pump, solves the problem of seal ring abrasion and oil leakage caused by sliding friction between a plunger and a seal ring in the prior art, and overcomes the defect of poor oil-water separation effect.

The utility model provides an oil-water separation structure which comprises a plunger, a cylinder body and a diaphragm, wherein the cylinder body 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 comprises a sealed outer ring, a sealed inner ring and a connecting part, the sealed outer ring and the sealed inner ring are connected through the connecting part, the sealed outer ring is connected with the cylinder body in a sealing mode, the sealed inner ring is connected with the plunger in a sealing mode, and the connecting part has elasticity.

Furthermore, the sealing surface of the sealing outer ring and the cylinder body is arranged on the inner wall of the sealing inner cavity.

Further, still include the sealing washer, the inner wall of sealed outer lane is equipped with the recess, the sealing washer embedded in the recess, the external diameter of sealed outer lane equals the diameter of sealed inner chamber, the external diameter of sealing washer is greater than the diameter on the outermost edge of the annular installation space that the recess encloses.

Further, the cylinder body comprises a low pressure cylinder, a high pressure cylinder and a sealing seat, and the low pressure cylinder and the high pressure cylinder are connected in a sealing mode through the sealing seat.

Furthermore, the sealing surface between the sealing outer ring and the cylinder body is arranged on the end surface of the sealing seat.

Further, still include the sealing ring, sealed outer lane is equipped with the sealed bulge loop that extends toward the outside direction to the level, the one end butt of sealing ring in sealed inner chamber's terminal surface, the other end butt of sealing ring in sealed bulge loop, sealed bulge loop with seal receptacle zonulae occludens.

Further, the outer diameter of the plunger is D3, the inner diameter of the sealing inner ring is D41, and D41 is smaller than or equal to D3.

Furthermore, the sealing inner ring further comprises a clamping ring, a clamping groove is formed in the outer wall of the sealing inner ring, the clamping ring is embedded in the clamping groove, and the inner diameter of the clamping ring is smaller than the diameter of the annular ring surrounded by the groove bottom of the clamping groove.

Furthermore, the inner wall of the sealing inner ring is provided with sealing bulges which are uniformly distributed on the inner wall of the sealing inner ring.

In a second aspect, the utility model provides a water pump, which comprises a cylinder body, a linkage device, at least one plunger and at least one diaphragm, wherein at least one sealed inner cavity is arranged in the cylinder body, each sealed inner cavity is connected with the corresponding plunger, the plungers and the sealed inner cavities are in sealed connection through the diaphragms, the linkage device is connected with the plungers, and the linkage device drives the plungers to linearly reciprocate in the sealed inner cavities.

The utility model has the beneficial effects that:

the utility model provides an oil-water separation structure and a water pump, wherein a diaphragm is connected between a plunger and a cylinder body in a sealing manner, a sealing outer ring is connected with the cylinder body in a sealing manner, a sealing inner ring is connected with the plunger in a sealing manner, when the plunger linearly reciprocates, the sealing inner ring moves along with the plunger, the connection between the sealing outer ring and the sealing inner ring is realized through a connecting part with elasticity, the relative rest between the sealing inner ring and the plunger is realized, the sliding friction phenomenon is avoided, the aging and wear condition of the sealing inner ring is reduced, the connecting part is in a reasonable elastic deformation range, the fatigue and aging time is very long and can be ignored through the bending deformation, the good oil-water separation effect is realized, and the service life is long.

Drawings

The utility model is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the utility model, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

Fig. 1 is a schematic cross-sectional structure of a plunger and a sealing rubber ring in the prior art.

Fig. 2 is a schematic cross-sectional view of an embodiment of the outer seal ring and the cylinder in the oil-water separation structure of embodiment 1.

Fig. 3 is a schematic sectional structure view of the diaphragm in the embodiment of fig. 2.

Fig. 4 is a sectional structure view of the seal ring in the embodiment of fig. 2.

Fig. 5 is an enlarged view of a part of the structure of the portion a in the embodiment of fig. 2.

Fig. 6 is a schematic cross-sectional view of another embodiment of the seal outer ring and the cylinder in the oil-water separation structure according to example 1.

Fig. 7 is a sectional structure view of the diaphragm in the embodiment of fig. 6.

Fig. 8 is a sectional structure view of the seal ring in the embodiment of fig. 6.

Fig. 9 is an enlarged view of a part of the structure of the portion B in the embodiment of fig. 6. But also to ensure the sealing effect between the sealing inner ring 32 of the diaphragm 3 and the plunger 1,

fig. 10 is a schematic sectional view showing an embodiment of the inner seal ring and the plunger in the oil-water separation structure according to example 1.

Fig. 11 is a schematic sectional view showing another embodiment of the inner seal ring and the plunger in the oil-water separation structure according to example 1.

Fig. 12 is a sectional structure view of the diaphragm in the embodiment of fig. 11.

Fig. 13 is a sectional view schematically showing the structure of the band in the embodiment of fig. 11.

Fig. 14 is a schematic sectional view of the plunger in the oil-water separation structure according to example 1 at the highest stroke.

Fig. 15 is a schematic sectional view of the oil-water separation structure according to example 1, in which the plunger is at the lowest stroke.

Fig. 16 is a schematic sectional view of the water pump of embodiment 2.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1:

referring to fig. 2 to 15, embodiment 1 provides an oil-water separation structure, including plunger 1, cylinder body 2 and diaphragm 3, cylinder body 2 is equipped with sealed inner chamber 4, and diaphragm 3 locates in sealed inner chamber 4, and plunger 1 wears to locate sealed inner chamber 4, and diaphragm 3 includes sealed outer lane 31, sealed inner circle 32 and connecting portion 33, and sealed outer lane 31 and sealed inner circle 32 pass through connecting portion 33 and connect, and sealed outer lane 31 and cylinder body 2 sealing connection, sealed inner circle 32 and plunger 1 sealing connection, and connecting portion 33 has elasticity.

It should be noted that, in the cylinder body 2 and the sealed inner cavity 4, the diaphragm 3 is simultaneously connected with the cylinder body 2 and the plunger 1 in a sealing way, an oil film on the plunger 1 is isolated by the sealed inner ring 32, so that lubricating oil is prevented from permeating into a water cavity, therefore, the diaphragm 3 also separates an oil cavity and a water cavity in the cylinder body 2, and when the plunger 1 moves linearly and reciprocally, the sealed inner ring 32 moves along with the oil cavity and the water cavity. More specifically, referring to fig. 14, when the plunger 1 moves to the water chamber side, the stroke of the plunger 1 reaches the highest position, and the amount of bending deformation of the connecting portion 33 is maximized; referring to fig. 15, when the plunger 1 moves to one side of the oil chamber, the stroke of the plunger 1 reaches the lowest position, the bending deformation of the connecting portion 33 is the smallest, the connecting portion 33 continuously undergoes reciprocating elastic deformation during the process of changing the stroke of the highest position and the stroke of the lowest position, the bending deformation changes back and forth between the largest and the smallest, the connection between the sealing outer ring 31 and the sealing inner ring 32 is realized through the connecting portion 33 with elasticity, the relative rest between the sealing inner ring 32 and the plunger 1 is realized, no matter which state the plunger 1 is in, the sealing inner ring 32 of the diaphragm 3 and the plunger 1 keep relative rest and have no abrasion, the occurrence of the sliding friction phenomenon is avoided, the aging and abrasion condition of the sealing inner ring 32 is reduced, and the connecting portion 33 is in a reasonable elastic deformation range, the fatigue and aging time through the bending deformation is very long and can be ignored, thereby realizing a good oil-water separation effect, the service life is long. In addition, the whole material of the diaphragm 3 can be integrally formed by soft rubber, has the functions of elasticity, toughness, sealing property and the like, and is suitable for the condition that the connecting part 33 has more reciprocating deformation times.

The sealing manner between the outer sealing ring 31 of the diaphragm 3 and the cylinder 2 can be divided into two types:

referring to fig. 2 to 5, as an embodiment, the sealing surface of the outer seal ring 31 and the cylinder 2 is provided on the inner wall of the inner seal cavity 4, the outer wall surface of the outer seal ring 31 is tightly connected to the inner wall of the inner seal cavity 4, and the sealing surface is parallel to the linear motion direction of the plunger 1 and is a curved surface.

In this embodiment, in order to increase the pressing force on the sealing surface and improve the sealing effect, the oil-water separation structure further includes a sealing ring 51, the inner wall of the outer sealing ring 31 is provided with a groove 52, 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 inner sealing cavity 4, the outer diameter of the sealing ring 51 is larger 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 with the diameter of the inner sealing cavity 4, by clamping the sealing ring 51 in the direction of the inner wall of the outer sealing ring 31, since the outer diameter of the sealing ring 51 is larger than the diameter of the outermost edge of the annular installation space surrounded by the groove 52, the sealing ring 51 will press the outer sealing ring 31 on the corresponding back surface of the groove 52, and the outer sealing ring 31 is tightly pressed on the inner wall of the inner sealing cavity 4 by the pressing force.

Preferably, the inner diameter of the seal ring 51 is equal to the inner diameter of the seal outer ring 31, that is, in the mounted state, the inner wall of the seal outer ring 31 and the inner wall of the seal ring 51 are flush with each other and flush with each other smoothly on the mating surface, and interference does not occur.

More specifically, the outer diameter of the seal outer ring 31 is D11, the thickness of the diaphragm 3 is t, the diameter D12 of the outermost edge of the annular installation space surrounded by the groove 52 is D11-2t, the inner diameter D13 of the seal outer ring 31 is D11-4t, the outer diameter D12 of the seal ring 51 is D11-t, the inner diameter of the seal ring 51 is D13, the diameter of the seal inner cavity 4 is D11, the compression amount of the seal ring 51 on the seal outer ring 31 is t/2, and the thickness of the seal ring 51 after one-side compression along the outer ring is t/2.

Referring to fig. 6 to 9, as another embodiment, the cylinder body 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 hermetically connected by the sealing seat 23, water or a disinfectant flows in the high pressure cylinder 22, and the water or the disinfectant provides pressure, the power of the plunger 1 is driven in the low pressure cylinder 21, the plunger 1 spans the low pressure cylinder 21 and the high pressure cylinder 22, the connecting surface of the low pressure cylinder 21 and the high pressure cylinder 22 separates an oil chamber and a water chamber, the sealing seat 23 is embedded in the connecting surface of the high pressure cylinder 22, the sealing seat 23, the low pressure cylinder 21 and the plunger 1 together enclose a sealing inner chamber 4, and a sealing outer ring 31 and a sealing surface of the cylinder body 2 are arranged on an end surface of the sealing seat 23, that is perpendicular to the linear movement direction of the plunger 1 and is a plane.

In the present embodiment, in order to increase the pressing force on the sealing surface and improve the sealing effect, the oil-water separation structure further includes a sealing ring 61, the outer sealing ring 31 is provided with a convex sealing ring 62 extending horizontally outward, the extending direction is perpendicular to the linear motion direction of the plunger 1, one end of the sealing ring 61 abuts against the end surface of the inner sealing cavity 4, the other end of the sealing ring 61 abuts against the convex sealing ring 62, the convex sealing ring 62 is tightly connected with the sealing seat 23, during the installation process, the sealing ring 61 is placed in the inner sealing cavity 4 of the low pressure cylinder 21, the diaphragm 3 is placed, at this time, the convex sealing ring 62 of the outer sealing ring 31 in the diaphragm 3 is matched with the outward end of the sealing ring 61, when the high pressure cylinder 22 is closed, under the extrusion of the high pressure cylinder 22 and the sealing ring 61, the sealing seat 23 is in interference fit with the convex sealing ring 62, the sealing effect is improved by pressing the convex sealing ring 62, the installation is convenient and the effect is good.

More specifically, the outer diameter of the sealing convex ring 62 is D21, the thickness of the diaphragm 3 is t, the outer diameter D22 of the sealing outer ring 31 is D21-2t, the inner diameter D23 of the sealing outer ring 31 is 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 thickness of the sealing ring 61 is t. Further, in the mounted state, the compression amount of the seal ring 61 to the seal convex ring 62 is t/2, and the compression deformation direction of the compression amount is the same as the linear movement direction of the plunger 1.

In this embodiment, in addition to ensuring the sealing effect between the outer sealing ring 31 of the diaphragm 3 and the cylinder 2, the sealing effect between the inner sealing ring 32 of the diaphragm 3 and the plunger 1 is also ensured, and the sealing manner between the inner sealing ring 32 of the diaphragm 3 and the plunger 1 can be divided into two types:

referring to fig. 10, as an embodiment, the outer diameter of the plunger 1 is D3, the inner diameter of the sealing inner ring 32 is D41, D41 is less than or equal to D3, and 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 by using the elastic characteristic of the diaphragm 3, so that the tight connection between the sealing inner ring 32 and the plunger 1 is maintained.

Preferably, the inner diameter D41 of the inner sealing ring 32 is two thirds of the outer diameter D3 of the plunger 1, and the tightness of the inner sealing ring 32 is high and the elastic deformation range is proper under the parameters.

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

Referring to fig. 11 to 13, as another embodiment, in order to improve the sealing effect between the inner seal ring 32 and the plunger 1, the oil-water separation structure further includes a clamping ring 71, and also based on the principle of external force reinforcement, the outer wall of the inner seal ring 32 is provided with a clamping groove 72, the clamping ring 71 is embedded in the clamping groove 72, the inner diameter of the clamping ring 71 is smaller than the diameter of an annular ring surrounded by the groove bottom of the clamping groove 72, and the clamping ring 71 with the smaller diameter applies pressure to the clamping groove 72 of the inner seal ring 32, thereby ensuring the sealing strength between the inner seal ring 32 and the plunger 1.

Preferably, the outer diameter of the band 71 is equal to the outer diameter of the inner seal ring 32, and is flush and smooth on the mating surface without interference.

Preferably, the thickness of the diaphragm 3 is t, the inner diameter D41 of the inner sealing ring 32 is equal to the outer diameter D3 of the plunger 1, the diameter D42 of the annular ring surrounded by the groove bottom of the clamping groove 72 is D41+3t, the outer diameter D43 of the inner sealing ring 32 is D41+4t, the inner diameter D42 of the clamping ring 71 is D41+2t, the outer diameter of the clamping ring 71 is equal to D43, the compression amount of the clamping ring 71 on the inner sealing ring 32 is t/2, and the clamping ring 71 presses the inner sealing ring 32 along one circle of the inner sealing ring, namely, the thickness of the inner sealing ring 32 after one-side compression is t.

Preferably, the seal ring 51 and the seal ring 61 for sealing the outer ring 31 and the clamping ring 71 for sealing the inner ring 32 are made of stainless steel materials, and have fixed size and reliable strength.

Referring to fig. 10, as a preferable mode, the inner wall of the seal inner ring 32 is provided with seal protrusions 73, the seal protrusions 73 are uniformly distributed on the inner wall of the seal inner ring 32, and resistance is increased by the seal protrusions 73 in order to increase the friction coefficient between the seal inner ring 32 and the plunger 1.

As a preferable mode, the outer wall of the plunger 1 is provided with a limit groove, at least a part of the sealing inner ring 32 coincides with the limit groove, the coinciding part of the sealing inner ring 32 is embedded in the limit groove, the sealing inner ring 32 is further prevented from sliding relatively between the sealing inner ring 32 and the plunger 1 by being embedded in the limit groove, and accordingly, the clamping ring 71 can be relatively arranged at the periphery of the limit groove.

Example 2:

referring to fig. 16, the embodiment provides a water pump, which includes a cylinder body 2, a linkage, at least one plunger 1 and at least one diaphragm 3, wherein at least one sealed cavity 4 is arranged in the cylinder body 2, each sealed cavity 4 is connected with the corresponding plunger 1, the plunger 1 is connected with the sealed cavity 4 in a sealed manner through the diaphragm 3, the linkage is connected with the plunger 1, and the linkage drives the plunger 1 to linearly reciprocate in the sealed cavity 4, wherein the sealed connection between the diaphragm 3 and the plungers 1 and the cylinder body 2 is as described in embodiment 1, and is not further described herein.

In one embodiment, the cylinder body 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 hermetically connected through the sealing seat 23, water or disinfectant flows in the high pressure cylinder 22, pressure is provided for the water or the disinfectant, power driving of the plunger 1 is provided in the low pressure cylinder 21, the plunger 1 spans across the low pressure cylinder 21 and the high pressure cylinder 22, a connecting surface of the low pressure cylinder 21 and the high pressure cylinder 22 is divided into an oil cavity and a water cavity, the sealing seat 23 is embedded in the connecting surface of the high pressure cylinder 22, a through hole is formed in the sealing seat 23, the plunger 1 is inserted through the through hole, and the low pressure cylinder 21 and the high pressure cylinder 22 are hermetically connected through the sealing seat 23.

Correspondingly, the linkage device comprises a motor 81, a bearing 82, a transmission shaft 83 and a swash plate 84, wherein the motor 81 is connected with the transmission shaft 83, the transmission shaft 83 is fixed with the swash plate 84, the connection shaft is connected with the low pressure cylinder 21 through the bearing 82, and the inclined surface of the swash plate 84 is abutted against the end part of each plunger 1.

Certainly, the oil-water separation structure can be applied to plunger type water pumps and can also be applied to other types of water pumps needing oil-water separation.

Compared with the prior art, the utility model provides an oil-water separation structure and a water pump, a diaphragm 3 is hermetically connected between a plunger 1 and a cylinder body 2, a sealing outer ring 31 is hermetically connected with the cylinder body 2, a sealing inner ring 32 is hermetically connected with the plunger 1, when the plunger 1 makes linear reciprocating movement, the sealing inner ring 32 moves along with the plunger, the connection between the sealing outer ring 31 and the sealing inner ring 32 is realized through a connecting part 33 with elasticity, the relative rest between the sealing inner ring 32 and the plunger 1 is realized, the occurrence of sliding friction phenomenon is avoided, the aging and wear conditions of the sealing inner ring 32 are reduced, the connecting part 33 is in a reasonable elastic deformation range, the time for achieving fatigue aging through the bending deformation is very long and can be ignored, the good oil-water separation effect is realized, and the service life is long.

Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only the preferred embodiments of the utility model have been described above, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides an oil-water separation structure, its characterized in that, includes plunger, cylinder body and diaphragm, the cylinder body is equipped with sealed inner chamber, the diaphragm is located in the sealed inner chamber, the plunger wears to locate sealed inner chamber, the diaphragm is including sealed outer lane, sealed inner circle and connecting portion, sealed outer lane and sealed inner circle pass through connecting portion connect, sealed outer lane with cylinder body sealing connection, sealed inner circle with plunger sealing connection, connecting portion have elasticity.

2. The oil-water separation structure according to claim 1, wherein a sealing surface between the seal outer ring and the cylinder block is provided on an inner wall of the seal inner chamber.

3. The oil-water separation structure of claim 2, further comprising a sealing ring, wherein a groove is formed in an inner wall of the sealing outer ring, the sealing ring is embedded in the groove, an outer diameter of the sealing outer ring is equal to a diameter of the sealing inner cavity, and the outer diameter of the sealing ring is larger than a diameter of an outermost edge of an annular installation space surrounded by the groove.

4. The oil-water separation structure of claim 1, wherein the cylinder body comprises a low pressure cylinder, a high pressure cylinder and a sealing seat, and the low pressure cylinder and the high pressure cylinder are hermetically connected through the sealing seat.

5. The oil-water separation structure according to claim 4, wherein a seal surface between the seal outer ring and the cylinder block is provided on an end surface of the seal holder.

6. The oil-water separation structure of claim 5, further comprising a sealing ring, wherein the sealing ring is provided with a sealing convex ring extending horizontally outward, one end of the sealing ring abuts against an end surface of the sealing cavity, the other end of the sealing ring abuts against the sealing convex ring, and the sealing convex ring is tightly connected with the sealing seat.

7. The oil-water separation structure of any one of claims 1 to 6, wherein the plunger has an outer diameter of D3, the inner diameter of the inner sealing ring is D41, and D41 is less than or equal to D3.

8. The oil-water separation structure of claim 7, further comprising a tightening ring, wherein the outer wall of the inner sealing 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 smaller than the diameter of an annular ring surrounded by the groove bottom of the tightening groove.

9. The oil-water separation structure of claim 8, wherein the inner wall of the inner sealing ring is provided with sealing protrusions, and the sealing protrusions are uniformly distributed on the inner wall of the inner sealing ring.

10. The utility model provides a water pump, its characterized in that includes cylinder body, aggregate unit, at least one plunger and at least one diaphragm, be equipped with at least one sealed inner chamber in the cylinder body, every sealed inner chamber connects the plunger that corresponds, pass through between plunger and the sealed inner chamber diaphragm sealing connection, aggregate unit with the plunger is connected, the aggregate unit drive the plunger in sealed inner chamber makes sharp reciprocating motion.

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