Mechanical seal pressure buffering mechanism and sea-land dual-purpose pump using same
By using elastic isolation parts to buffer the oil chamber pressure changes in the land and sea pump, the seal damage caused by the rise in mechanical oil temperature is solved, ensuring that the sealing end surface is lubricated and heat dissipated under different postures, and extending the service life of the land and sea pump.
Patent Information
- Application Number
- CN202422260252.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-14
AI Technical Summary
In existing land and sea pumps, the increase in the temperature of the mechanical oil causes the pressure to increase the oil chamber, causing damage to the mechanical seal. The sealing end surface may lose lubrication and heat dissipation when installed in different postures, resulting in the failure of the seal.
A machine-sealing pressure buffering mechanism is designed to make use of the compressibility of the elastic spacer, by setting an embedded groove and a buffer film or hollow buffer ring in the shell to fill air and buffer the oil chamber pressure changes, ensuring that the mechanical oil fills the oil chamber and lubricates the sealed end surface.
Effectively reduce the pressure of the oil chamber, prevent mechanical seal damage, ensure that the sealing end surface is fully lubricated and heat dissipated in various postures, and extend the service life of the sea and land pump.
Smart Images
Figure CN223177747U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of marine and terrestrial pumps, in particular to a mechanical seal pressure buffer mechanism and a marine and terrestrial dual-purpose pump using the same. Background Art
[0002] A submersible pump is a downdraft submersible electric pump with a coaxial motor and pump housing. It utilizes a dry, three-phase asynchronous motor. The motor chamber is dry, while the pump chamber contains water. The motor chamber and the pump chamber are separated by an oil chamber and a double-end mechanical seal within the oil chamber. The oil chamber is filled with mechanical oil for lubrication and cooling of the mechanical seal. During operation, the mechanical oil absorbs heat from mechanical losses in the mechanical seal and is also conducted by the motor. This heat absorption causes the oil to heat up, which in turn causes the oil to expand in volume. However, the volume of the oil chamber is relatively fixed. A sudden increase in pressure in the oil chamber can deform the chamber boundary and damage the mechanical seal.
[0003] To reduce the pressure in the oil chamber, the current practice is to control the oil volume in the oil chamber, retaining a certain amount of air, and utilizing the compressibility of air to reduce the chamber's operating pressure. However, mechanical seal leakage is absolute, and the amount of air in the oil chamber will change with mechanical seal leakage. If all the air leaks out, the oil chamber pressure will increase sharply, squeezing the oil chamber boundary and deforming it, causing damage to the mechanical seal. Furthermore, in applications, land and sea pumps can be installed and operated in various postures, such as horizontal or vertical. Air and mechanical oil coexist in the same chamber, and air, with its lower density and location at the top, can expose the sealing face of the mechanical seal to the air in the oil chamber, losing lubrication and heat dissipation, leading to mechanical seal failure.
[0004] Therefore, the purpose of this utility model is to design a mechanical seal pressure buffer mechanism that can effectively reduce the increased pressure in the oil chamber caused by the increase in mechanical oil temperature, avoid excessive pressure squeezing the oil chamber boundary deformation and causing damage to the mechanical seal; at the same time, ensure that when the amphibious pump is installed and operated in various postures, the mechanical seal sealing end face can be fully lubricated and dissipated in the oil chamber, so as not to cause mechanical seal failure. Utility Model Content
[0005] In response to the technical problems existing in the above-mentioned prior art, the present invention provides a mechanical seal pressure buffer mechanism and an amphibious pump using the same, which can effectively solve the technical problems existing in the above-mentioned prior art.
[0006] The technical solution of the utility model is:
[0007] A mechanical seal pressure buffer mechanism, comprising:
[0008] A housing, an oil chamber for filling mechanical oil is provided inside the housing, a mechanical seal connected to a rotating shaft is installed inside the housing, and the mechanical seal is immersed in the mechanical oil;
[0009] An elastic isolation member filled with corresponding gas, the elastic isolation member is installed inside the housing and is spaced from the mechanical seal, when the mechanical oil pressure increases, the elastic isolation member is compressed; when the mechanical oil pressure returns, the elastic isolation member resumes.
[0010] An embedding groove coaxial with the rotating shaft is recessed inwardly on the inner bottom surface or inner side wall of the housing, the elastic isolation member includes a buffer film hermetically fixed above the embedding groove, and the buffer film and the embedding groove form a corresponding sealed accommodation cavity filled with air.
[0011] The middle part of the buffer film bulges outward with a semi-circular arc-shaped cross section, and its two sides are folded and extended outward and are hermetically fixed outside the embedding groove of the housing by corresponding inner ring pressing plates, outer ring pressing plates and many locking screws arranged at intervals.
[0012] The buffer film is made of oil-resistant rubber.
[0013] The elastic isolation member is a hollow buffer ring arranged in a tire shape, the hollow buffer ring is filled with corresponding air, and the hollow buffer ring is sleeved outside the mechanical seal at intervals and is fixed inside the housing by a connecting plate and locking screws fixed on its outer side wall.
[0014] The hollow buffer ring is made of oil-resistant rubber or thick film.
[0015] An oil injection hole communicating with the oil chamber inside the housing is provided on the side wall of the housing, and the oil injection hole is detachably sealed by a corresponding annular ring and an inner hexagon screw, and the elastic isolation member is spaced from the oil injection hole.
[0016] The housing includes an upper housing and a lower housing that are detachably and hermetically connected up and down, the inner connection part of the upper housing and the lower housing is arranged in a stepped shape and is fitted with a corresponding O-ring, and the upper housing and the lower housing are hermetically and fixedly connected by corresponding spring washers and external hexagon bolts.
[0017] The mechanical seal is a double-end mechanical seal fixedly installed between the upper housing and the lower housing, and a corresponding skeleton oil seal is installed on the rotating shaft outside the lower housing.
[0018] A land-sea dual-use pump using the above-mentioned mechanical seal pressure buffer mechanism, a pump body and a motor, wherein the pump body and the motor are coaxial and connected through the above-mentioned mechanical seal pressure buffer mechanism. The rotating shaft is fixedly connected to the output shaft of the motor or extends outward from the output shaft of the motor. The other side of the housing where the motor is not installed is sealed and installed with a corresponding pump cover through a washer and an external hexagonal bolt. The pump cover is connected to the housing and is provided with a corresponding water pump chamber. An impeller is fixedly installed on the rotating shaft in the water pump chamber through a corresponding connecting key, spring washer and cap nut.
[0019] Advantages of the present utility model:
[0020] 1) The present utility model is a mechanical seal pressure buffer mechanism applicable to sealed installations such as land-sea dual-use pumps. On the basis of ensuring the sealing performance of the motor installation, by utilizing the compressibility characteristics of the elastic isolation member, it effectively reduces the increased pressure in the oil chamber caused by the rise in the temperature of the mechanical oil, avoids the deformation of the oil chamber boundary caused by excessive pressure extrusion, and prevents mechanical seal damage; after the temperature of the mechanical oil decreases, the elastic isolation member can be reset under the expansion action of the compressed air.
[0021] At the same time, the elastic isolation member of the buffer mechanism can ensure that the air filled therein is in a closed state, and the air will not leak when the elastic isolation member is compressed, thereby ensuring that the mechanical oil fills the entire oil chamber, and the mechanical seal is immersed in the mechanical oil, so as to ensure that when the land-sea pump is installed and operated in various postures, the sealing end face of the mechanical seal can be fully lubricated and dissipated heat in the oil chamber, and the mechanical seal will not fail.
[0022] 2) The elastic isolation member of the present utility model is formed by arranging corresponding embedding grooves at the bottom or the inner side wall of the housing, and sealing and installing a buffer film above the embedding grooves through inner and outer ring pressing plates and locking screws. An accommodation cavity is formed by the embedding grooves and the buffer film to fill air, and the installation is convenient and simple. Or an elastic isolation member in the form of a hollow buffer ring prepared in a tire shape can be adopted. The hollow buffer ring is filled with air, and hollow buffer rings of different sizes are prepared in advance according to requirements and then fixedly installed in the oil chamber to improve the practical effect.
[0023] 3) By setting the mechanical seal pressure buffer mechanism on the land-sea dual-use pump of the present utility model, not only the problem of mechanical seal damage caused by the sudden increase in the pressure of the oil chamber is solved, the service life is extended, but also the installation posture of the land-sea dual-use pump can be adjusted arbitrarily according to requirements. Description of the drawings
[0024] Figure 1 It is a schematic structural diagram of the present utility model.
[0025] Figure 2 It is a schematic diagram of the use state of the present utility model applied to a land-sea dual-use pump.
[0026] In the attached drawings: housing 1, oil chamber 2, mechanical seal 3, embedding groove 4, buffer film 5, inner ring pressing plate 6, outer ring pressing plate 7, O-ring 8, oil injection hole 101, upper housing 102, lower housing 103, skeleton oil seal 9, pump body 10, rotating shaft 11, water pump chamber 12, impeller 13. Detailed implementation mode
[0027] For the convenience of those skilled in the art to understand, the structure of the present invention will be further described in detail below in conjunction with the attached drawings:
[0028] Embodiment 1
[0029] Reference Figure 1 , a mechanical seal pressure buffer mechanism, comprising:
[0030] Housing 1, an oil chamber 2 for filling mechanical oil is arranged in the housing 1, a mechanical seal 3 connected to the rotating shaft 11 is installed in the housing 1, and the mechanical seal 3 is immersed in the mechanical oil, that is, the side surface of the mechanical seal 3 located in the oil chamber 2 is immersed in the mechanical oil to ensure good lubrication and heat dissipation of the mechanical seal 3;
[0031] Elastic isolation member, which is filled with corresponding gas, the elastic isolation member is installed in the housing 1 and is arranged at a distance from the mechanical seal 3, when the mechanical oil pressure increases, the elastic isolation member is compressed; when the mechanical oil pressure returns, the elastic isolation member resumes.
[0032] The present invention is a mechanical seal pressure buffer mechanism that can be applied to the sealed installation of amphibious pumps, etc. On the basis of ensuring the installation sealing performance of the motor, by using the compressibility characteristics of the elastic isolation member, the pressure increase in the oil chamber 2 caused by the increase in the temperature of the mechanical oil is effectively reduced, and the deformation of the boundary of the oil chamber 2 caused by excessive pressure extrusion is avoided, so as to prevent damage to the mechanical seal 3; after the temperature of the mechanical oil decreases, the elastic isolation member can be reset under the expansion action of the compressed air;
[0033] At the same time, the elastic isolation member of the buffer mechanism can ensure that the air filled therein is in a closed state, and the air will not leak when the elastic isolation member is compressed, thereby ensuring that the mechanical oil fills the entire oil chamber 2, and the mechanical seal 3 is immersed in the mechanical oil, so as to ensure that when the amphibious pump is installed and operated in various postures, the sealing end face of the mechanical seal 3 can be fully lubricated and dissipated heat in the oil chamber 2, and the mechanical seal 3 will not fail.
[0034] A circle of embedding grooves 4 coaxial with the rotating shaft 11 is recessed inwardly on the inner bottom surface or inner side wall of the housing 1, the elastic isolation member includes a buffer film 5 hermetically fixed above the embedding groove 4, and the buffer film 5 and the embedding groove 4 form a corresponding sealed accommodation cavity and are filled with air.
[0035] The middle part of the buffer film 5 bulges outwards, and its cross-section is in the shape of a semi-circular arc. Its two sides are folded outwards and extended, and are hermetically fixed on the outside of the embedding groove 4 of the housing 1 through the corresponding inner ring pressing plate 6, outer ring pressing plate 7 and many locking screws arranged at intervals.
[0036] The buffer film 5 is made of oil-resistant rubber.
[0037] The elastic isolation member of the present utility model is formed by arranging a corresponding embedding groove 4 at the bottom or the inner side wall of the housing 1, and hermetically installing a buffer film 5 above the embedding groove 4 through inner and outer ring pressing plates and locking screws. An accommodation cavity is formed by the embedding groove 4 and the buffer film 5 to fill air, and the installation is convenient and simple.
[0038] An oil injection hole 101 communicating with the oil chamber 2 inside is arranged on the side wall of the housing 1, and the oil injection hole 101 is detachably sealed by a corresponding annular ring and an inner hexagon screw, and the elastic isolation member is arranged at an interval from the oil injection hole 101.
[0039] The housing 1 includes an upper housing 102 and a lower housing 103 that are detachably and hermetically connected up and down. The inner connection part of the upper housing 102 and the lower housing 103 is arranged in a stepped shape and is embedded with a corresponding O-ring 8, and the upper housing 102 and the lower housing 103 are hermetically connected and locked through corresponding spring washers and external hexagon bolts.
[0040] The mechanical seal 3 is a double-end mechanical seal fixedly installed between the upper housing 102 and the lower housing 103, and a corresponding skeleton oil seal 9 is installed on the outside of the lower housing 103 on the rotating shaft 11.
[0041] Embodiment 2
[0042] The difference from Embodiment 1 is that: the elastic isolation member is a hollow buffer ring arranged in a tire shape, the hollow buffer ring is filled with corresponding air, and the hollow buffer ring is sleeved at intervals on the outside of the mechanical seal 3 and is fixedly connected to the inside of the housing 1 through an adapter plate and locking screws fixed on its outer side wall.
[0043] The hollow buffer ring is made of oil-resistant rubber or a thick film.
[0044] The present utility model may also adopt an elastic isolation member prepared in advance in the form of a hollow buffer ring arranged in a tire shape, with air filled in the hollow buffer ring. Hollow buffer rings of different sizes are prepared in advance according to requirements, and then fixedly installed in the oil chamber 2 to improve the practical effect.
[0045] Embodiment 3
[0046] Reference Figure 2, A land-sea dual-purpose pump using the above-mentioned mechanical seal pressure buffer mechanism, including a pump body 10 and a motor. The pump body 10 and the motor are coaxial and connected through the above-mentioned mechanical seal pressure buffer mechanism. The rotating shaft 11 is fixedly connected to the output shaft of the motor or extends outward from the output shaft of the motor. The housing 1 is sealed and installed with a corresponding pump cover on the other side where the motor is not installed through a washer and an external hexagonal bolt. The pump cover is connected to the housing 1 and is provided with a corresponding water pump chamber 12. A corresponding impeller 13 is fixedly installed on the rotating shaft 11 in the water pump chamber 12 through a corresponding connecting key, spring washer and cap nut.
[0047] By setting the mechanical seal pressure buffer mechanism, the land-sea dual-purpose pump of the present invention not only solves the problem of damage to the mechanical seal 3 caused by the sharp increase in the pressure of the oil chamber 2, prolongs the service life, but also can arbitrarily adjust the installation attitude of the land-sea dual-purpose pump according to needs.
[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.
Claims
1. A mechanical seal pressure buffering mechanism, characterized in that, Comprising: A housing (1) with an oil chamber (2) for filling mechanical oil provided therein. A mechanical seal (3) connected to a rotating shaft (11) is installed in the housing (1), and the mechanical seal (3) is immersed in the mechanical oil. An elastic isolation member filled with a corresponding gas. The elastic isolation member is installed in the housing (1) and is spaced from the mechanical seal (3). When the mechanical oil pressure increases, the elastic isolation member is compressed; when the mechanical oil pressure returns, the elastic isolation member recovers.
2. The mechanical seal pressure buffer mechanism according to claim 1, wherein An embedding groove (4) coaxial with the rotating shaft (11) is recessed inwardly on the inner bottom surface or inner side wall of the housing (1). The elastic isolation member includes a buffer film (5) fixedly sealed above the embedding groove (4), and the buffer film (5) and the embedding groove (4) form a corresponding sealed accommodation cavity filled with air.
3. The mechanical seal pressure buffer mechanism according to claim 2, characterized in that, The middle part of the buffer film (5) protrudes outward with a semi-circular arc-shaped cross-section, and its two sides are folded and extended outward and are fixedly sealed outside the embedding groove (4) of the housing (1) through corresponding inner ring pressing plates (6), outer ring pressing plates (7) and a plurality of spaced locking screws.
4. The mechanical seal pressure buffer mechanism according to claim 2, wherein, The buffer film (5) is made of oil-resistant rubber.
5. The mechanical seal pressure buffering mechanism according to claim 1, characterized in that, The elastic isolation member is a hollow buffer ring arranged in a tire shape, filled with corresponding air therein, and the hollow buffer ring is sleeved outside the mechanical seal (3) at intervals and is fixedly connected to the housing (1) through an adapter plate and locking screws fixedly connected to its outer side wall.
6. The mechanical seal pressure buffer mechanism according to claim 5, characterized in that, The hollow buffer ring is made of oil-resistant rubber or a thick film.
7. A mechanical seal pressure buffer mechanism according to claim 1, characterized in that, A fuel injection hole (101) communicating with the oil chamber (2) inside is provided on the side wall of the housing (1), and the fuel injection hole (101) is detachably sealed by a corresponding annular ring and an internal hexagonal screw, and the elastic isolation member is spaced from the fuel injection hole (101).
8. The mechanical seal pressure buffer mechanism according to claim 1, characterized in that, The housing (1) includes an upper housing (102) and a lower housing (103) detachably and sealingly connected up and down. The inner connection part of the upper housing (102) and the lower housing (103) is arranged in a stepped shape and is fitted with a corresponding O-ring (8), and the upper housing (102) and the lower housing (103) are tightly sealed and connected through corresponding spring washers and external hexagonal bolts.
9. The mechanical seal pressure buffer mechanism according to claim 8, characterized in that, The mechanical seal (3) is a double-end mechanical seal fixedly installed between the upper housing (102) and the lower housing (103), and a corresponding skeleton oil seal (9) is installed on the rotating shaft (11) outside the lower housing (103).
10. A land-sea dual-use pump using the mechanical seal pressure buffer mechanism described in any one of claims 1-9, characterized in that, It includes a pump body (10) and a motor. The pump body (10) and the motor are coaxial and are connected and arranged through the mechanical seal pressure buffer mechanism described above. The rotating shaft (11) is fixedly connected to the output shaft of the motor or extends outward from the output shaft of the motor. On the other side where the motor is not installed, the housing (1) is sealed and installed with a corresponding pump cover through a washer and an external hexagon bolt. The pump cover is connected to the housing (1) and is provided with a corresponding water pump chamber (12). Inside the water pump chamber (12) on the rotating shaft (11), a corresponding impeller (13) is fixedly installed through a corresponding connecting key, spring washer, and cap nut.