CN113833640A - Compressor and oil level sensor assembly thereof - Google Patents
Compressor and oil level sensor assembly thereof Download PDFInfo
- Publication number
- CN113833640A CN113833640A CN202010582123.6A CN202010582123A CN113833640A CN 113833640 A CN113833640 A CN 113833640A CN 202010582123 A CN202010582123 A CN 202010582123A CN 113833640 A CN113833640 A CN 113833640A
- Authority
- CN
- China
- Prior art keywords
- compressor
- magnetic
- magnet
- level sensor
- oil level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/76—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats characterised by the construction of the float
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention discloses a compressor and an oil level sensor assembly thereof. The fuel level sender assembly comprising: the lower shell cover is packaged at the bottom of the compressor shell, and a first mounting hole is formed in the bottom of the lower shell cover. And the first end of the fixed pipe in the axial direction penetrates through the first mounting hole. The reed switch is arranged in the fixed pipe. The magnetic float is provided with a through hole which is in sliding fit with the fixed pipe. The magnetic floater comprises a floating ball and an inner magnet arranged in the floating ball. And a dust collection magnet provided on a side of the lower case cover facing the compressor case. The dust collecting magnet and the inner magnet have the same magnetic pole direction, so that magnetic force repelling each other along the axial direction is formed between the dust collecting magnet and the inner magnet. The oil level sensor assembly of the compressor can increase the resistance effect of the magnetic float on the oil film viscosity, reduce the influence of the oil film viscosity of oily substances on the magnetic float and ensure the reliability of the oil level sensor.
Description
Technical Field
The invention relates to the field of refrigeration equipment, in particular to a compressor and an oil level sensor assembly thereof.
Background
The compressor using the oil level sensor is generally applied to a light commercial or commercial air conditioning system, and is generally a large-displacement compressor, and the specification of the compressor is also large. The compressor has relatively more scrap irons in the operation process, and a dust collecting magnet is generally required to be arranged at the bottom of the compressor, so that the normal operation of the compressor is prevented from being influenced by too much scrap irons. The magnetic float of the oil level sensor floats along with the oil level, and outputs an alarm signal when the magnetic float approaches the induction device, so that the magnetic float is usually arranged at the bottom of the compressor.
The oil level sensor is generally fixedly connected with a lower shell cover of the compressor to form an oil level sensor assembly, and the bottom of the lower shell cover has more oily substances in the normal use process of the compressor. The oily substance and the magnetic float have certain oil film viscosity, and particularly when the running temperature of the compressor is low, the magnetic float can not normally operate because the oily substance is adsorbed at the bottom of the lower shell cover.
In order to solve the above technical problems, in the prior art, a spring is usually added below a floating ball of a magnetic float to ensure normal action of the magnetic float, but in the actual use process, the design of the spring cannot increase the resistance effect of the magnetic float on the viscosity of an oil film, and even the magnetic float cannot fall normally.
Disclosure of Invention
The present invention is directed to a compressor and an oil level sensor assembly thereof, which are used to reduce the influence of oil film viscosity of oily substances on a magnetic float and ensure the reliability of the oil level sensor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a fuel level sender assembly for a compressor, comprising:
the lower shell cover is packaged at the bottom of the compressor shell, and a first mounting hole is formed in the bottom of the lower shell cover.
And the first end of the fixed pipe in the axial direction penetrates through the first mounting hole.
The reed switch is arranged in the fixed pipe.
The magnetic float is provided with a through hole which is in sliding fit with the fixed pipe. The magnetic floater comprises a floating ball and an inner magnet arranged in the floating ball. And
and the dust collection magnet is arranged on one side of the lower shell cover facing the compressor shell. The dust collecting magnet and the inner magnet have the same magnetic pole direction, so that magnetic force repelling each other along the axial direction is formed between the dust collecting magnet and the inner magnet.
In one embodiment of the present invention, when a distance between a central axis of the dust collection magnet and a central axis of the inner magnet is denoted by L:
L>3√[(Br2*K0*S)/(Fgravity force*10％*2μ0)]Where Br is remanence, K0For reducing the magnetic coefficient, S is the cross-sectional area of the magnetic circuit, FGravity forceIs the gravity of a magnetic floater0Is a vacuum magnetic permeability.
In one embodiment of the invention, 22mm < L <55 mm.
In one embodiment of the present invention, the dust collection magnet is annular and is provided coaxially with the compressor housing.
In an embodiment of the present invention, a first end of the fixing tube in the axial direction is provided with a first limit structure, and the first limit structure is formed as an annular radial protrusion with a diameter larger than that of the first mounting hole.
In an embodiment of the present invention, a second end of the fixing tube in the axial direction is provided with a second limiting structure, and a maximum width of the second limiting structure is greater than a diameter of one end of the through hole, which is away from the first mounting hole.
In an embodiment of the present invention, the floating ball is formed in a cylindrical shape.
According to another aspect of the present invention, there is provided a compressor including the oil level sensor assembly of the compressor as described above.
The oil level sensor assembly of the compressor can increase the resistance effect of the magnetic float on the oil film viscosity, reduce the influence of the oil film viscosity of oily substances on the magnetic float and ensure the reliability of the oil level sensor.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
Fig. 1 is a schematic view of the construction of a fuel level sensor assembly for a compressor in accordance with an embodiment of the present invention.
Fig. 2 is a schematic view showing a magnetic field distribution of the inner magnet and the dust collecting magnet of fig. 1. And
fig. 3 is a perspective view of the magnetic float in the fuel level sensor assembly of fig. 1.
Reference numerals
1 lower casing cover
2 fixed pipe
3 dry reed pipe
4 magnetic float
5 dust collecting magnet
21 first limit structure
22 second limit structure
41 float ball
42 inner magnet
411 through hole
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
Fig. 1 is a schematic view of the construction of a fuel level sensor assembly for a compressor in accordance with an embodiment of the present invention. Fig. 2 is a schematic view showing the magnetic field distribution of the inner magnet and the dust collecting magnet in fig. 1. And FIG. 3 is a perspective view of the magnetic float in the fuel level sensor assembly of FIG. 1. As shown in fig. 1 to 3, the present embodiment provides an oil level sensor assembly of a compressor, which includes a lower case cover 1, a fixed tube 2, a reed pipe 3, a magnetic float 4, and a dust collection magnet 5. The lower shell cover 1 is packaged at the bottom of the compressor shell, and a first mounting hole is formed in the bottom of the lower shell cover 1. The first axial end of the fixed pipe 2 is arranged in the first mounting hole in a penetrating mode. The reed pipe 3 is arranged in the fixed pipe 2. The magnetic float 4 has a through hole 411 which is slidably engaged with the fixed tube 2. The magnetic float 4 comprises a floating ball 41 and an inner magnet 42 arranged in the floating ball 41. The dust collecting magnet 5 is provided on the side of the lower housing cover 1 facing the compressor housing. The dust collecting magnet 5 and the inner magnet 42 have magnetic poles in the same direction, so that a magnetic force repelling each other in the axial direction is formed between the dust collecting magnet 5 and the inner magnet 42.
The oil level sensor assembly of the compressor can increase the resistance action of the magnetic float 4 on the oil film viscosity, reduce the influence of the oil film viscosity of oily substances on the magnetic float 4 and ensure the reliability of the oil level sensor. Fig. 2 shows only a schematic view of the magnetic field distribution of the inner magnet 42 and the dust collecting magnet 5 in fig. 1, and both the dust collecting magnet 5 and the inner magnet 42 may have their N poles facing upward. However, the present invention is not limited thereto, and for example, the dust collecting magnet 5 and the inner magnet 42 may be both S-pole-up magnets, which can solve the problems of the prior art and achieve the corresponding technical effects.
In this embodiment the reed switch 3 comprises two soft magnetic material metal reed contacts that open when no magnetic field is present, and in some other embodiments there may be a third reed that acts as a normally closed contact. These reed contacts are enclosed in a glass tube filled with an inert gas (e.g., nitrogen, helium, etc.) or vacuum, and the parallel enclosed reed ends in the glass tube overlap and are either gapped or in contact with each other to form normally open or normally closed contacts of the switch. The magnetic floater 4 can control the opening and closing of the reeds along with the upward floating or sinking of the liquid level, so that the on-off of a circuit is influenced, and the alarm function of the oil level sensor is realized.
A distance between the central axis of the dust collection magnet 5 and the central axis of the inner magnet 42 is denoted by L, and: l is>3√[(Br2*K0*S)/(FGravity force*10％*2μ0)]Where Br is remanence, K0For reducing the magnetic coefficient, S is the cross-sectional area of the magnetic circuit, FGravity forceIs the gravity, mu, of the magnetic float 40Is a vacuum magnetic permeability. Specifically, the magnetic force F due to repulsion between the dust collecting magnet 5 and the inner magnet 42Magnetic fieldIs much smaller than the gravity F of the floating ball 41Gravity forceThe tolerance of the floating or sinking liquid level of the magnetic floater 4 is estimated within +/-2 mm, and the repulsive magnetic force FMagnetic fieldThe magnetic float 4 floats upwards in advance, and the position relation between the actual oil level and the expected alarm oil level is changed. Combining a large amount of experimental data, the F of the magnetic float 4 can be knownMagnetic fieldThe occupied proportion is at least less than the gravity F of the magnetic float 4Gravity force10% of (i), i.e., FMagnetic field<FGravity force*10％。
According to Maxwell's suction formula FMagnetic field＝(B2S)/(2μ0). Wherein B is the magnetic flux density (Wb/m2), and S is the cross-sectional area (m) of the magnetic path2)，μ0Is a vacuum permeability, mu0＝1.25*10-6(H/m). Further, the magnetic force between the dust collection magnet 5 and the inner magnet 42 is almost inversely proportional to the third power of the horizontal distance therebetween. Therefore, in combination with the prior art, FMagnetic field＝(Br2*K0*S)/[L3*(2μ0)]Where Br is remanence, K0To lower the magnetic coefficient, and K0＝1.6*109. Therefore, L>3√[(Br2*K0*S)/(FGravity force*10％*2μ0)]。
TABLE 1
Table 1 shows the relevant experimental data. It can be seen from table 1 that when L is less than 22mm, the early warning height of the fuel level sensor exceeds the expected tolerance of the liquid level (+ -2 mm), and the ratio of the magnetic force to the gravity is > 10%, which is obviously not in accordance with the design requirement.
Further, in order to ensure the reliability of the oil level sensor, L >22mm may be preferable. Of course, considering that the maximum radius of the compressor housing is typically 55mm, the distance L between the central axis of the dust collecting magnet 5 and the central axis of the inner magnet 42 should naturally be such that: l <55 mm.
The inner magnet 42 may be a plurality of cylindrical magnets annularly distributed around the through hole 411. Alternatively, the inner magnet 42 may be at least one ring magnet disposed coaxially with the through hole 411. The inner magnet 42 may be disposed in the floating ball 41. Further, the through hole 411 may pass through the center of gravity of the magnetic float 4. Therefore, the resistance of the magnetic float 4 fluctuating along with the oil surface can be reduced, and the sensitivity of the oil level sensor is improved. Further, the openings at both ends of the through-hole 411 have the same size. The fuel level sensor assembly may thereby eliminate the need for mounting structures to mount the buoyancy spring or associated components. Therefore, the resistance of the magnetic float 4 fluctuating along with the oil surface can be reduced, and the sensitivity of the oil level sensor is improved.
Referring to fig. 1, the dust collecting magnet 5 may be annular and disposed coaxially with the compressor housing. Therefore, the iron chips generated in the operation process of the compressor can be effectively adsorbed, and the influence on the normal operation of the compressor due to too much iron chips is avoided. The fixed pipe 2 is vertically arranged at the bottom of the lower shell cover 15. The level of lubricant in the compressor can thus be monitored more accurately. A first axial end of the fixed tube 2 may be provided with a first stop formation 21, the first stop formation 21 being formed as an annular radial projection having a diameter greater than the first mounting hole. This first limit structure 21 both can avoid magnetic float 4 and lower casing lid 1 direct contact, also is convenient for fixed pipe 2 and lower casing lid 1's stable connection.
Further, as shown in fig. 1, a second limiting structure 22 is disposed at the second axial end of the fixing tube 2, and the second limiting structure 22 may also be designed with reference to the first limiting structure 21, as long as the maximum width of the first limiting structure 21 is greater than the inner diameter of the through hole 411. Therefore, the magnetic float 44 can be prevented from being separated from the fixed pipe 2, and the reliability of the oil level sensor for monitoring the liquid level of the lubricating oil in the compressor is ensured.
As shown in fig. 3, the float ball 41 is formed in a cylindrical shape. In addition, the floating ball 41 may also be formed in a spherical shape or other regular shapes, which is not limited in the present invention. Therefore, the production process of the floating ball 41 can be simplified, the assembly of the oil level sensor assembly is facilitated, the resistance of the magnetic float 4 along with the fluctuation of the oil level can be reduced, and the sensitivity of the oil level sensor is improved.
In summary, the oil level sensor assembly of the compressor of the present invention can increase the resistance of the magnetic float 4 to the oil film viscosity, reduce the influence of the oil film viscosity of the oily substance on the magnetic float 4, and ensure the reliability of the oil level sensor.
Further, according to another aspect of the present invention, there is also provided a compressor including the oil level sensor assembly as described above. The specific structure of the fuel level sender assembly and its corresponding technical effects can be seen in fig. 1-3 and described above. In summary, the oil level sensor assembly of the compressor of the present invention can increase the resistance of the magnetic float 4 to the oil film viscosity, reduce the influence of the oil film viscosity of the oily substance on the magnetic float 4, and ensure the reliability of the oil level sensor.
In this embodiment, the compressor is naturally provided with other components, such as a motor, a pump body, a housing, and the like, in the related art, in addition to the oil level sensor assembly described above. Since it is not the innovative point of the present invention, its specific structure is designed with reference to the prior art. Therefore, the present invention is not limited thereto, nor is it described in detail herein.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. An oil level sensor assembly for a compressor, comprising:
the lower shell cover is packaged at the bottom of the compressor shell, and a first mounting hole is formed in the bottom of the lower shell cover;
and the first end of the fixed pipe in the axial direction penetrates through the first mounting hole.
The reed switch is arranged in the fixed pipe.
The magnetic float is provided with a through hole which is in sliding fit with the fixed pipe. The magnetic floater comprises a floating ball and an inner magnet arranged in the floating ball. And
and the dust collection magnet is arranged on one side of the lower shell cover facing the compressor shell. The dust collecting magnet and the inner magnet have the same magnetic pole direction, so that magnetic force repelling each other along the axial direction is formed between the dust collecting magnet and the inner magnet.
2. The oil level sensor assembly of a compressor according to claim 1, wherein a distance between a central axis of said dust collecting magnet and a central axis of said inner magnet is denoted as L, then:
L>3√[(Br2*K0*S)/(Fgravity force*10％*2μ0)]Where Br is remanence, K0For reducing the magnetic coefficient, S is the cross-sectional area of the magnetic circuit, FGravity forceIs the gravity of a magnetic floater0Is a vacuum magnetic permeability.
3. The fuel level sender assembly of claim 2, wherein 22mm < L <55 mm.
4. The fuel level sensor assembly of claim 1, wherein the dust collection magnet is annular and is disposed coaxially with the compressor housing.
5. The oil level sender assembly of claim 1, wherein said first axial end of said stationary tube defines a first stop formation formed as an annular radial projection having a diameter greater than said first mounting opening.
6. The fuel level sender assembly of claim 1, wherein the second axial end of the stationary tube defines a second limit formation having a maximum width greater than a diameter of the through bore at an end thereof facing away from the first mounting opening.
7. The fuel level sensor assembly of claim 1, wherein the float ball is formed in a cylindrical shape.
8. A compressor comprising the oil level sender assembly of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010582123.6A CN113833640A (en) | 2020-06-23 | 2020-06-23 | Compressor and oil level sensor assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010582123.6A CN113833640A (en) | 2020-06-23 | 2020-06-23 | Compressor and oil level sensor assembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113833640A true CN113833640A (en) | 2021-12-24 |
Family
ID=78964217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010582123.6A Pending CN113833640A (en) | 2020-06-23 | 2020-06-23 | Compressor and oil level sensor assembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113833640A (en) |
-
2020
- 2020-06-23 CN CN202010582123.6A patent/CN113833640A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6812583B2 (en) | Electrical generator with ferrofluid bearings | |
| US7288860B2 (en) | Magnetic transducer with ferrofluid end bearings | |
| US20030155827A1 (en) | Multiple magnet transducer | |
| US9709435B2 (en) | Pivoted float liquid level sensor having a magnetically actuated switch | |
| CN1307374C (en) | Passive type axial magnetic suspension bearing of possessing damping action | |
| US9362072B2 (en) | Magnetic float switch | |
| CN212867870U (en) | Compressor and oil level sensor assembly thereof | |
| US6557412B1 (en) | Non-fouling liquid level control | |
| GB2324874A (en) | Isolating a ferrofluid from sensor housing | |
| CN101882853A (en) | Linear vibrator | |
| JP2006091012A (en) | Magnetic fluid accelerometer with partial filling of magnetic fluid into gap | |
| US6813946B1 (en) | Liquid sensing | |
| JP6019317B2 (en) | Float type liquid level detector | |
| CN113833640A (en) | Compressor and oil level sensor assembly thereof | |
| Raj et al. | Ferrofluids—properties and applications | |
| CN101819081A (en) | Direct induction type leakage detector | |
| US4645887A (en) | Pressure differential bypass sensor switch | |
| JPS6047691B2 (en) | Structure of liquid level float switch | |
| US3823328A (en) | Liquid level control system and switch assembly therefor | |
| US3781498A (en) | Liquid level detector | |
| CN213392608U (en) | Compressor and oil level sensor assembly thereof | |
| CN112727973B (en) | Magnetic liquid vibration damper | |
| CN215949762U (en) | A kind of compressor | |
| JP6014836B2 (en) | Float type liquid level detector | |
| US20220285113A1 (en) | Fall detection sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |