KR20090124879A - Vacuum pump for fire fighting car - Google Patents

Abstract

PURPOSE: A vacuum pump for a fire truck is provided to reduce the abrasion thereof and to increase durability and a vacuum degree. CONSTITUTION: An inlet and an outlet are formed in the housing. Front and rear covers(42,43) are installed in front and rear sides of the housing. The rotor is fixed inside the housing horizontally with an eccentric shaft(44). The vane is inserted the outer circumference of the rotor in order to integrally rotates along with the eccentric shaft. Five cutout grooves are formed on the rotor in a radial direction from the center part, and inserted into the five vanes.

Description

Vacuum pump for fire fighting car

The present invention relates to a vacuum pump for a fire engine, and in particular, low viscosity water is used instead of the working oil used to ensure smooth lubrication and airtightness, thereby preventing environmental pollution, and vacuum pump with five vane types for improving the degree of vacuum. It is configured to provide a press ring of the appropriate diameter on the five vanes to ensure the vacuum tightness and durability.

In general, fire trucks that extinguish fire by waterproofing fire extinguishing water use a fire pump having a strong discharge pressure to waterproof fire extinguishing water. The fire pump used in such a fire truck has a very large capacity, so when a fire pump is driven, a pick-up material for sucking fire extinguishing water is required. In order to inhale these objects, it is configured to suck the air in the pipeline with a vacuum pump to increase the degree of vacuum so that the extinguishing water can be sucked up initially.

Such a vacuum pump will be described with reference to the accompanying drawings.

1 is a structural view of a fire pump in a state where a conventional fire pump vacuum pump is installed, and FIGS. 2 and 3 are cross-sectional views illustrating main parts of a conventional fire pump.

As shown in Figures 1 to 3, the conventional fire pump is composed of the main pump 100, the electromagnetic clutch 200, the vacuum pump 300, the water valve valve 400 and the non-return valve (500).

The vacuum pump 300 has a cylindrical housing 310, the inlet 311 and the outlet 312 is formed; A rotor 330 fixed by an eccentric shaft 320 eccentrically arranged inside the housing 310; The rotor 330 is composed of a plurality of vanes 340 inserted to rotate integrally with the eccentric shaft 320 on the outer peripheral surface.

The rotor 330 has a plurality of incision grooves 331 radially formed at the center thereof, and a rectangular vane 340 is inserted into the incision groove 331. At this time, the rotor 330 is formed of the same material as the housing 310, the shaft hole is formed so that the eccentric shaft 320 can be inserted into the central region. In addition, a space 332 is formed inside the rotor 330 except for the cutting groove 331, thereby reducing the weight of the rotor 330.

At this time, the rotor 330 is fixed to the eccentric shaft 320 inside the housing 310, the outer circumference of the rotor 330 and the inner circumference of the housing 310 is formed to be in point contact.

Referring to the operation of the conventional fire pump as follows. First, the impeller 110 constituting the main pump 100 is rotated by the operation of the fire engine, so that external water flows into the interior. At the same time, the main shaft 120 rotates so that the clutch gear 210 of the electromagnetic clutch 200 installed on one side of the main shaft 120 rotates, and the drive gear 333 meshed with the clutch gear 210 rotates. Done.

Accordingly, the rotor 330 constituting the vacuum pump 300 is rotated eccentrically along the eccentric shaft 320, the plurality of vanes 340 is a cutting groove 331 of the rotor 330 by centrifugal force Rotate while sequentially popping out.

At the same time, a predetermined amount of water in the impeller 110 is introduced into the housing 310 through the suction port 311 formed in the housing 310 and connected to the suction pipe 111 on the impeller 110 side of the fire pump. In addition, the air of the space 332 divided by the inner wall of the housing 310 and the vane 340 is pushed to the discharge port 312 by narrowing the space due to the eccentric rotation, thereby increasing the vacuum degree inside the fire pump at an instant. .

Accordingly, the water inside the impeller 110 is extruded to the outside through the above-mentioned water valve 400 and the non-return valve 500 by the vacuum pressure difference.

As such, when the degree of vacuum inside the fire fighting pump is momentarily increased, the electromagnetic clutch 200 is automatically separated and the vacuum gear 300 as the clutch gear 210 of the clutch 200 is separated from the driving gear 3. Operation is interrupted.

However, such a conventional vacuum pump is composed of four types of cutting grooves of the outer circumference of the rotor eccentrically arranged inside the housing by the eccentric shaft and vanes (wings) inserted therein, thereby forming vacuum pressure and using oil. The result of the analysis of the amount, the maximum pressure attainment of the degree of vacuum analysis, and the initial waterproof start time analysis experiments resulted in unsatisfactory results. Also, in the decomposition results after the endurance test, the wear of the vacuum pump was large and the durability was deteriorated.

The present invention has been made to solve such a conventional problem, the present invention consists of a vane coupled to the rotor and the vane coupled to the eccentrically coupled vacuum pump to the housing, the end of the vane in a semi-circular The present invention provides a vacuum pump for a fire engine.

The problem solving means of the present invention is the inlet and outlet is formed, the cylindrical housing closed with a front, rear cover; A rotor fixed by an eccentric shaft eccentrically arranged horizontally inside the housing; In the vacuum pump consisting of vanes inserted to rotate integrally with the eccentric shaft on the outer circumference of the rotor, the rotor is formed in five radially in the central region, the incision is five rectangular It is characterized in that the vanes are respectively inserted so that the vanes.

In addition, the vane is characterized in that the contact portion having a radius of 5mm is formed to facilitate the lubricity of the housing inner periphery and vacuum hermetic operation.

And, both ends of the rotor is provided with a jin press ring made of an outer diameter of 55mm, it is characterized in that to prevent the pushing by limiting the vane movement during rotation of the vane.

According to the vacuum pump for a fire truck of the present invention, the vacuum pump is composed of five vane types, and the radius of the end of the vane is composed of 5 mm, the vacuum pressure forming experiment, the oil amount analysis experiment, the vacuum degree reaching maximum pressure analysis experiment, the initial stage Improved results were generated in the waterproof start time analysis experiments, and the durability of the vacuum pump was reduced and the durability was improved in the decomposition result after the endurance test, thereby improving the degree of vacuum.

Hereinafter, with reference to the accompanying drawings will be described a specific content for the practice of the present invention.

Figure 4 of the accompanying drawings is a fire pump structure of the fire pump vacuum pump according to the present invention is installed, Figure 5 is a perspective view of a fire engine vacuum pump according to the present invention, Figures 6 and 7 according to the present invention Fig. 8 is a front view showing the vane structure of the vacuum pump for fire truck according to the present invention.

4 to 8, the fire pump according to the present invention is composed of the main pump 10, the electromagnetic clutch 20, the vacuum pump 30, the water valve valve 80 and the non-return valve 90 do.

The vacuum pump 30 has a suction housing (40a) and the discharge port (40b) is formed, the cylindrical housing 40 closed with a front, rear cover 42, 42; A rotor 50 fixed by an eccentric shaft 44 eccentrically arranged horizontally in the housing 40; The rotor 50 is composed of a plurality of vanes 60 inserted to rotate integrally with the eccentric shaft 44 on the outer peripheral surface.

The rotor 50 has a plurality of cutting grooves 52 are formed radially in the central region, and the cutting grooves 52 are inserted into the cutting grooves 52 so that the vanes 60 having a rectangular shape can be projected.

At this time, the rotor 50 is made of the same material as the housing 40, the shaft hole 54 is formed so that the eccentric shaft 44 can be inserted in the central region. In addition, a space 56 is formed inside the rotor 50 except for the cutting groove 52, thereby reducing the weight of the rotor 50.

On the other hand, the rotor 50 is fixed to the inside of the housing 40 by the eccentric shaft 44, the outer periphery of the rotor 50 and the inner periphery of the housing 40 is formed so that the point contact.

Both ends of the rotor 50 is provided with a press ring 70 having an outer diameter of 55 mm to prevent the vane 60 from being pushed by limiting the movement of the vane 60.

On the other hand, five cutting grooves 52 are formed at equal intervals on the outer periphery of the rotor 50, and the five cutting vanes 60 are inserted into the cutting groove 52 so as to be protruding from the four conventional grooves. The effect is superior to the vane type.

At this time, the bale 60 is inserted so that each end is equal to or slightly protrudes from the skin surface of the incision groove 5, semi-circular contact portion 62 so as to easily secure the lubricity of the inner periphery of the housing 40 and the vacuum airtight operation Is formed. This contact 6 exhibits the maximum effect when its radius is maintained at 5 mm.

Referring to the operating state of the fire pump according to the present invention configured as described above are as follows.

First, the impeller 11 constituting the main pump 10 is rotated by the operation of the fire engine, so that external water flows into the inside. At the same time, the main shaft 12 rotates so that the clutch gear 21 of the electromagnetic clutch 20 arranged on one side of the main shaft 12 rotates, and one end of the eccentric shaft 44 engaged with the clutch gear 21 is rotated. The drive gear 46 is rotated.

Accordingly, the rotor 50 constituting the vacuum pump 30 rotates eccentrically along the eccentric shaft 44, and the plurality of vanes 60 are cut out 52 of the rotor 50 by centrifugal force. Rotate while sequentially popping out.

At the same time, a predetermined amount of water in the impeller 11 is introduced into the housing 40 through the suction port 40a which is formed in the housing 40 and connected to the suction pipe 11a of the impeller 11 side of the fire pump. Then, the air of the space portion 56 divided by the inner wall of the housing 40 and the vanes 60 is pushed to the discharge port 40b by narrowing the space due to the eccentric rotation, thereby temporarily increasing the vacuum degree inside the fire pump. .

Accordingly, the water inside the impeller 11 is extruded to the outside through the above-mentioned water valve 80 and the non-return valve 90 by the vacuum pressure difference.

As such, when the degree of vacuum in the fire pump is momentarily increased, the electromagnetic clutch 20 is automatically separated and the vacuum gear 30 as the clutch gear 21 of the clutch 20 is separated from the drive gear 46. Operation is interrupted.

On the other hand, the test of the vacuum pump of the five types of vanes of the present invention operated as described above and the conventional four types of vanes will be compared.

1.Compare 5 Types of Vanes and 4 Types of Vanes

○ experimental conditions;

-Basic performance measurement every 5 minutes while driving motor is continuously operated at 1500 RPM for 30 minutes (Analysis of critical parts after durability: Analysis of housing and vane dimensional change)

-Measurement of leakage of critical parts of fire pump during durability test

○ 5 type vane vacuum pump (applied to water)

Experimental Measurement Results

Experiment item Criteria production The same time  liver Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum  Formation experiment 640 mmHg Within / 30sec 6.05 sec 5.65 sec 5.35 sec 5.35 sec 5.25 sec 5.10 sec 5.20 sec No noise during experiment, no leakage of shaft part of water pump. use oil Mass assay 250 cc Within 360cc 340cc 300 cc 315cc 360cc 380cc 380cc Vacuum degree Peak pressure reached  Time Analysis Experiment Limit pressure and  Reach time measurement 720mmHg / 14.84 sec 720mmHg / 14.03 sec 720mmHg / 11.25 sec 720mmHg / 11.50 sec 720mmHg / 10.60 sec 720mmHg / 10.55 sec 720mmHg / 11.10 sec Initial Waterproof Start Time Assay 30 sec Within 10.55 sec 10.27 sec 9.50 sec 9.49 sec 10.57 sec 10.28 sec 10.01 sec

< After the experiment  Analysis result>

Measurement Part Name division Measuring position (mm) One 2 3 4 Vane Before experiment 34.60 / 34.49 34.58 / 34.48 34.61 / 34.50 34.61 / 34.54 After the experiment 34.56 / 34.45 34.54 / 34.44 34.59 / 34.49 34.59 / 34.51 Housing Before experiment ø126.06 After the experiment ø126.08 Analysis No wear of vanes and housing in contact with vanes. Mechanical Sealing Unit No decomposition and no water leakage

○ 4 type vane vacuum pump (applied to water)

Experimental Measurement Results

Experiment item Criteria Operating time Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum forming experiment 640 mmHg Within / 30sec 7.80 sec 6.68 sec 5.82 sec 5.95 sec 5.42 sec 5.03 sec 5.14 sec No noise during experiment, no leakage of shaft part of water pump. use Oil level  Assay 250 cc Within 850 cc 670cc 605cc 680cc 535cc 550cc 550cc Vacuum degree Peak pressure reached  Time Analysis Experiment Limit pressure and  Reach time measurement 700mmHg / 15.97 sec 710mmHg / 15.41 sec 720mmHg / 15.09 sec 720mmHg / 11.12 sec 720mmHg / 11.60 sec 720mmHg / 11.14 sec 720mmHg / 11.10 sec Initial waterproof start Time  Assay 30 sec Within 10.49 sec 10.27 sec 9.68 sec 10.18 sec 9.47 sec 10.01 sec 9.94 sec

<Analysis result after experiment>

Measurement Part Name division Measuring position (mm) One 2 3 4 Vane Before experiment 34.61 / 34.54 34.59 / 34.51 34.60 / 34.52 34.61 / 34.53 After the experiment 34.54 / 34.48 34.51 / 34.46 34.56 / 34.48 34.56 / 34.49 Housing Before experiment ø126.06 After the experiment ø126.10 Analysis No wear of vanes and housing in contact with vanes. Mechanical Sealing Unit No decomposition and no water leakage

○ Experimental conclusion

According to the test results, the five-type vane vacuum pump (water application) fire pump system was compared to the four-type vane vacuum pump (water application) fire water pump system. The results were improved in the peak pressure test and the initial waterproof start time analysis.

In addition, even after disassembly after durability test, 5 type vane vacuum pump has less wear and durability than 4 type bale vacuum pump.

2. Comparison of 5 types of vane unit and 4 types of vane unit

Experimental conditions;

-Basic performance measurement every 5 minutes while driving motor is continuously operated at 1500 RPM for 30 minutes.

      -Measurement of leakage of critical parts of fire water pump during durability test

○ 5 type vanes single

Experimental Measurement Results

Experiment item Criteria production The same time  liver Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum  Formation experiment 640 mmHg Within / 30sec 8.2 sec 6.89 sec 6.14 sec 6.12 sec 6.24 sec 6.05 sec 6.05 sec No noise during experiment use Oil level  Assay 250 cc Within 920cc 800 cc 720 cc 710cc 710cc 710cc 710cc Vacuum degree Peak pressure reached  Time Analysis Experiment Limit pressure and  Reach time measurement 700mmHg / 16.25 sec 710mmHg / 16.15 sec 710mmHg / 16.15 sec 710mmHg / 16.05 sec 710mmHg / 16.10 sec 710mmHg / 16.10 sec 710mmHg / 16.15 sec Initial waterproof start Time  Assay 30 sec Within 12.29 sec 11.48 sec 11.49 sec 11.49 sec 11.29 sec 11.29 sec 10.69 sec

< After the experiment  Analysis result>

Measurement Part Name division Measuring position (mm) One 2 3 4 Vane Before experiment 34.59 / 34.60 34.60 / 34.59 34.61 / 34.59 34.60 / 34.59 After the experiment 34.50 / 34.54 34.53 / 34.53 34.54 / 34.51 34.55 / 34.52 Housing Before experiment ø126.05 After the experiment ø126.12 Analysis No wear of vanes and housing in contact with vanes.

○ 4 type vanes single

Experimental Measurement Results

Experiment item Criteria production The same time  liver Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum  Formation experiment 640 mmHg Within / 30sec 8.9 sec 7.9 sec 8.2 sec 7.4 sec 7.9 sec 8.2 sec 8.05 sec Serious noise during the experiment use Oil level  Assay 250 cc Within 980 cc 960 cc 990cc 950cc 980 cc 970 cc 980 cc Vacuum degree Peak pressure reached  Time Analysis Experiment Limit pressure and  Reach time measurement 690mmHg / 18 sec 700mmHg / 16 sec 690mmHg / 18 sec 700mmHg / 17 sec 690mmHg / 18 sec 690mmHg / 18 sec 680mmHg / 19 sec Initial Waterproof Start Time Assay 30 sec Within 15.29 sec 14.48 sec 15.49 sec 14.49 sec 15.29 sec 15.29 sec 15.69 sec

< After the experiment  Analysis result>

Measurement Part Name division Measuring position (mm) One 2 3 4 Vane Before experiment 34.6 / 34.58 34.61 / 34.59 34.61 / 34.59 34.60 / 34.59 After the experiment 34.10 / 33.70 34.00 / 33.87 33.89 / 34.10 33.92 / 33.95 Housing Before experiment ø126.05 After the experiment ø126.50 Analysis Heavy wear of vanes and housing in contact with vanes

○ Experimental conclusion

According to the test results, the vane tip contacting the housing has a semi-circle of 5mm in order to secure the vacuum tightness and lubricity of operation of the housing and vanes.

3. Comparison of Optimum Clearance Correlation Characteristics between the Sum of Press Ring Outer Diameter and Vane Electric Field and the Housing Inner Diameter

1) Experimental sample

Above and figure show the test sample fabrication with the outer diameter of the pump press ring of ø54mm and ø55mm to analyze the correlation characteristics of the optimum clearance. (The shape of vane end is made of sample with 5mm radius)

○ experimental conditions;

-Basic performance measurement every 5 minutes while driving motor is continuously operated at 1500 RPM for 30 minutes (Analysis of critical part change after endurance: analysis of housing and vane dimensional change)

      -Measurement of leakage of critical parts of fire water pump during durability test

3) Prototype of outer diameter (ø54mm) of press ring

Experimental Measurement Results

Experiment item Criteria Operating time Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum forming experiment Within 640mmHg / 30sec 8.2sec 6.89sec 6.14 sec 6.12sec 6.24sec 6.05sec 6.05sec No noise during the experiment Leakage on the shaft of the water pump. Oil level assay Within 250cc 920cc 800 cc 720 cc 710cc 710cc 710cc 710cc Vacuum maximum pressure attained time assay Maximum limit pressure and arrival time measurement 700mmHg / 16.25 sec 710mmHg / 16.15 sec 710mmHg / 16.15 sec 710mmHg / 16.05 sec 710mmHg / 16.10 sec 710mmHg / 16.10 sec 710mmHg / 16.15 sec Initial Waterproof Start Time Assay Within 30sec 12.29sec 11.48sec 11.49sec 11.49sec 11.29sec 11.29sec 10.69 sec

<Analysis result after experiment>

Measurement Part Name division Measuring position (mm) One 2 3 4 veil Before experiment 34.59 / 34.60 34.60 / 34.59 34.61 / 34.59 34.60 / 34.59 After the experiment 34.50 / 34.54 34.53 / 34.53 34.54 / 34.51 34.55 / 34.52 Housing g Before experiment ø126.05 After the experiment ø126.12 Analysis No wear of vanes and housing in contact with vanes.

2) Prototype with press ring outer diameter (ø55mm)

Experimental Measurement Results

Experiment item Criteria production The same time  liver Remarks Early After 5min After 10min After 15min After 20min After 25min After 30min Vacuum  Formation experiment 640 mmHg Within / 30sec 8.0 sec 6.78 sec 5.91 sec 5.97 sec 5.44 sec 5.03 sec 5.13 sec No noise during experiment, leakage of shaft of water pump. use Oil level  Assay 250 cc Within 900 cc 720 cc 610 cc 710cc 540cc 560cc 550cc Vacuum degree Peak pressure reached  Time Analysis Experiment Limit pressure and  Reach time measurement 700mmHg / 15.97 sec 700mmHg / 15.31 sec 720mmHg / 15.19 sec 720mmHg / 11.16 sec 720mmHg / 11.65 sec 720mmHg / 11.16 sec 720mmHg / 11.18 sec Initial Waterproof Start Time Assay 30 sec Within 10.69 sec 10.47 sec 9.78 sec 10.29 sec 9.47 sec 10.81 sec 9.91 sec

<Analysis result after experiment>

Measurement Part Name division Measuring position (mm) One 2 3 4 Veil Before experiment 34.59 / 34.80 34.57 / 34.49 34.61 / 34.52 34.60 / 34.52 After the experiment 34.52 / 34.50 34.53 / 34.43 34.56 / 34.48 34.55 / 34.48 housing Before experiment ø126.08 After the experiment ø126.12 Analysis No wear of vanes and housing in contact with vanes. No problem with oilless bearing unit disassembly result

○ Experimental conclusion

Of vacuum pump In order to ensure vacuum tightness and lubricity and durability of operation, it is necessary to determine the optimum clearance between the sum of the outer diameter of the vacuum pump and the total length of the vane and the inner diameter of the housing.

1 is a structural view of a fire pump in a state where a conventional fire pump vacuum pump is installed.

2 and 3 is a sectional view showing the main part of the structure of a conventional fire pump vacuum pump.

Figure 4 is a fire pump structure diagram of the fire pump vacuum pump is installed in accordance with the present invention.

5 is a perspective view of a fire engine vacuum pump according to the present invention.

6 and 7 is a cross-sectional view of the main part of the vacuum pump for a fire engine according to the present invention.

Figure 8 is a front view showing the vane structure of the vacuum pump for a fire engine according to the present invention.

<Description of the symbols for the main parts of the drawings>

30: vacuum pump 40: housing

50: rotor 52: incision groove

60: vane 62: contact portion

70: press ring

Claims (3)

A cylindrical housing 40 formed with an inlet 40a and an outlet 40b and closed with front and rear covers 42 and 42; A rotor (50) fixed by an eccentric shaft (44) arranged horizontally and eccentrically in the housing (40); In the vacuum pump 30 consisting of a vane (60) inserted into the rotor (50) outer peripheral surface to be integrally rotated with the eccentric shaft (44), The rotor 50 has five incision grooves 52 formed radially in the central region. The cut groove 52 is a vacuum pump for a fire truck, characterized in that each of the five vanes 60 made of a rectangular shape is inserted into the inlet. The vacuum pump for a fire truck according to claim 1, wherein the vane (60) has a contact portion (62) having a radius of 5 mm to facilitate lubrication of the inner periphery of the housing (40) and vacuum airtight operation. According to claim 1, wherein both ends of the rotor 50 is provided with a jin press ring 70 made of an outer diameter of 55mm, to prevent the vane 60 to be pushed by limiting the movement of the vane (60). A vacuum pump for fire trucks, characterized in that.

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