CN2427650Y - Energy-saving single-screw rod cmpressor - Google Patents

Abstract

The utility model relates to an energy saving single screw rod compressor which is composed of a main shaft, a machine body, a screw rod, and a star wheel. Teeth of the star wheel and the screw rod are teeth with different widths. The discharge capacity is increased. The energy efficiency ratio is raised, and simultaneously the size and the weight of the compressor are also decreased. Favorable conditions are created for single screw rod compressors to be developed into compressors with small discharge capacities. The rigidity of star wheel supporting frames is increased, and the service life of the star wheel is extended.

Description

Energy-saving single-bolt compressor

The utility model relates to a kind of energy-saving single-bolt compressor, belongs to the compressor class, mainly supplies power (as air compressor), refrigeration and technology (as compressing the compressor of multiple chemical gases) to use.

Helical-lobe compressor has two kinds of single screw rod and twin-screws.Single screw compressor also claims worm compressor, is invented in nineteen sixty, and the eighties adopts " floating star wheel " and prolonged star-wheel and just be tending towards maturation after the life-span.The structure of single screw compressor is seen Fig. 4, constitutes by the star-wheel 6 of one 6 screw rods 11 and two 11 teeth, and on 7 bearings in body 10 in of the main shaft of screw rod, piece number 8 expression air aspiration cavitys, piece number 9 is represented relief openings.During running, main axis rotation, that the engagement that drives screw rod tooth and star-wheel tooth is finished is air-breathing, sealing, compression and discharge, to finish compressed-air actuated operation.

Helical-lobe compressor has advantages such as volume is little, noise is low, vibration is little, good reliability, the life-span is long and can under high pressure work, and replacing piston compressor with helical-lobe compressor is the development trend of power with compressor.As: Japan's helical-lobe compressor in 1976 only accounts for and then rose to 85% in 27%, 1985 year.A complete set of technology China of double-screw compressor has introduced many covers, but is not first-class technology, difficult and foreign trader's competition of seizing Chinese market.Therefore producer and the foreign trader who has is joint, and the producer that has introduces the technology of renewal once more.Single screw compressor is then because external blockade is the only high-grade compressor of failing to introduce of China.

Because the screw rod of single screw compressor meshes with two star-wheels simultaneously, has both made the stressed complete equilibrium of screw rod, and discharge capacity is doubled, the volume of compressor is little, 9m ³The weight of/min single screw compressor only is 1/6 of piston compressor.The screw rod stress balance makes single screw compressor have series of advantages: (1) running is steady, vibration is little, the noise ratio twin-screw hangs down more than the 10dB (A), and (2) screw rod does not have bending deflection, can under high pressure work, for example: U.S. De Laisai.Single screw rod technology compressor that Rand Corporation produces even also can reach 6.16MPa under the condition of one-level compression, can only reach 2.18MPa and twin-screw is the highest.(3) engagement pair can be worked under very little gap and be leaked to reduce, thereby the volumetric efficiency height.In addition, single screw compressor is because shaft strength is little, and spider gear shaft and screw rod vertical interlaced, and bearing size is restricted unlike twin-screw, and when adopting standard rolling bearing, bearing life is that 50,000 hours (ball bearing) was to 100,000 hours (tapered roller bearing)." freedom from repairs " time of complete machine is correspondingly between 5-10 ten thousand hours.Submarine all has strict requirement to every performance of compressor, yet USN is in order to eliminate piston compressor, existing various compressors have been carried out thinking after a large amount of tests and the demonstration: single screw compressor is the submarine optimal compressor, is only selection for the high voltage oil-free compressor.USN since the eighties active research and managing set up domestic technology source.

Though it is late that single screw type comes out than double-screw type, powerful because of the excellent performance ascendant trend, single, double screw type has half share substantially on the international market at present.Main as air compressor, freezing (air-conditioning) machine, heat pump and compression all gases or transport gas, coal gas etc. in the technological process of Chemical Manufacture.Have only four countries such as U.S., day on the basis of introducing technology, to produce at present, the highest with Japanese level.

Since domestic priority in 1975 several units development single screw compressor is arranged: State Scientific and Technological Commission once classified the development work of single screw compressor as key research projects in 1986; After this Commission of Science, Technology and Industry for National Defence also will develop the naval vessel and classify key research projects as with the problem of single screw compressor.These development works are not all succeeded because of failing to solve a series of key technology, mainly show as compressor discharge capacity in operation process and descend rapidly.

Recently China has broken external blockade on new techniques, obtained comprehensive breakthrough at aspects such as fundamental research, highi degree of accuracy special purpose machine tool, technology and cutters, has solved the processing technique of screw rod, star-wheel high-levelly.But the only shortcoming of single screw compressor is: during the float amount, its energy consumption is greater than double-screw compressor, and energy consumption index is not preponderated yet during big discharge capacity, and therefore, if can not have breakthrough on power-saving technology, the single screw compressor industry of China just is difficult to development.With the air conditioner is example: the import volume of the semiclosed screw rod air conditioner of China is far more than home-made machine at present, because energy consumption is bigger, the import volume of single screw rod is less than twin-screw.In order to open up the power-saving technology that the Chinese market various countries all make great efforts to seek single screw compressor, even specially for Chinese market designs energy-conserving product, but do not have significant results.If the breakthrough that China takes the lead in getting on power-saving technology, China just can capture the commanding height of helical-lobe compressor and air conditioner industry, maintains the leading position in the world.Become a large amount of imports of compressor and be a large amount of outlets, therefore, China also pays attention to Research on energy saving.This patent is one of achievement of China single screw compressor power-saving technology aspect, and it has kept all advantages of single screw compressor and energy-conservation.

As everyone knows, during other parameter constant of single screw compressor, increase the star-wheel diameter and not only increase discharge capacity but also can improve Energy Efficiency Ratio.When for example the diameter of certain its screw rod of import air-conditioning and star-wheel was φ 147mm, discharge capacity was 169m ³/ h; After the diameter of star-wheel increased to φ 154mm, discharge capacity increased to 198m/h, and Energy Efficiency Ratio is increased to 4.39w/w by 4.21w/w.Therefore increasing the star-wheel diameter is an important means that improves single screw compressor efficient, but increases the restriction that the star-wheel diameter is subjected to structure sometimes at present, and the influence that the more little this restriction of screw diameter is caused is big more.

The structure of the single screw compressor of prior art is seen Fig. 6, and its star-wheel 6 is wide tooth 5, and promptly the bus of star-wheel tooth and arranged on left and right sides to the distance at star-wheel running center equates, sees b=b/2+b/2 shown in Figure 6.Its deficiency is: energy consumption is bigger; Be difficult to use in float amount type; Perhaps reduce the rigidity of star-wheel carriage, thereby shorten the star-wheel life-span in order to cut down the consumption of energy.

The purpose of this utility model is to overcome above-mentioned deficiency of the prior art and provides a kind of capable of reducing energy consumption and can be to the energy-saving single-bolt compressor of float amount type development.

The purpose of this utility model can reach by following measure: the utility model is made of main shaft, body, screw rod and star-wheel, the bus of star-wheel tooth and arranged on left and right sides is unequal to the distance at star-wheel running center, be that the star-wheel tooth is non-wide tooth, the screw rod tooth is non-wide tooth.

The screw rod teeth groove is darker, and its intensification value is Δ d ₂/ 2.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the local figure of engagement of non-wide dental star wheel of the utility model and screw rod;

Fig. 2 for the A of Fig. 1 to dwindling view;

Fig. 3 is the comparison diagram of wide tooth (dotted line is represented) and non-wide tooth (solid line);

Fig. 4 is the structural drawing of helical-lobe compressor;

Fig. 5 is the local figure of engagement of wide dental star wheel of prior art and screw rod.

The accompanying drawing piece number is represented:

1, screw rod 2, non-wide tooth 3, star-wheel 4, bus

5, wide tooth 6, star-wheel 7, main shaft 8, air aspiration cavity

9, exhaust cavity 10, body 11, screw rod

12, carriage

The utility model is described in further detail below in conjunction with embodiment and accompanying drawing:

Fig. 1 represents local meshing engagement structure of the present utility model, the utility model constitutes by a screw rod 1 with two star-wheels 3 of non-wide tooth 2, the tooth of star-wheel is non-wide tooth 2, and the bus 4 of this tooth and arranged on left and right sides to the distance at star-wheel running center is unequal, i.e. the B of Fig. 1 ₂＞B ₁, the width of tooth is represented with B.The length of star-wheel tooth is long than prior art, see shown in Figure 3, tine length lengthening Δ d ₂/ 2.The screw rod tooth is the wide tooth of right and wrong also, and the depth ratio prior art of screw rod tooth is dark, and with the star-wheel (i.e. Jia Chang star-wheel tooth) that holds increased diameter, as shown in Figure 3, the intensification value of screw rod teeth groove is Δ d ₂/ 2.

Because screw rod simultaneously and two star-wheels engagements, so screw rod 1 teeth groove and the shared position of star-wheel 3 (containing star-wheel carriage 13) can not surpass half-turn in Fig. 2, promptly≤180 °.Be to guarantee the rigidity of star-wheel carriage, a teeth groove of screw rod shared angle φ in the screw rod cross section ₁Determine.φ ₁After determining, angle φ ₂Determine by following formula:

φ ₂=φ ₁×Z ₁／Z ₂

In the formula: Z ₁The screw head number is generally 6; Z ₂Tooth number of star is generally 11.In Fig. 3: φ ₂Be the maximum functional corner of star-wheel,, just in time throw off to the right tooth angle of star-wheel and to end from star-wheel tooth closed spiro rod teeth groove.The bus of existing its star-wheel tooth both sides of single screw compressor to the distance at star-wheel running center equates that the width of promptly right half tooth and left half tooth equates.This profile of tooth is actual at present unique profile of tooth of using, is referred to as wide tooth, so that distinguish with the unequal non-wide tooth of half facewidth degree.

For ease of relatively, with dashed lines and solid line coexist and represent among Fig. 3 respectively with wide tooth and non-wide tooth under the identical condition of other parameter.As can be seen from Figure 3: when the star-wheel equal diameters of two kinds of profiles of tooth, both right tooth angles are compared (1), and non-wide tooth can break away from screw rod quickly and withdraw from engagement, therefore can reduce φ ₁And φ ₂Angle and increase star-wheel carriage thickness is to improve carriage rigidity and to prolong the star-wheel life-span.(2) when the diameter of non-wide dental star wheel than wide dental star wheel diameter d ₂Increase Δ d ₂The time, their right tooth angle still can break away from screw rod simultaneously and not lag behind.That is: under identical condition, adopt non-wide tooth to allow to increase the star-wheel diameter.When the profile of screw rod is the increment Delta d of cylndrical surface clock star wheel diameter ₂Can calculate by following formula: $\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="9924882800082.png,9924882800092.png"\; state="\{\{state\}\}">d</figure-callout>}}_2=2\sqrt{\&lsqb;\left(\frac{b}{2}{-B}_1\right)\mathrm{tg}{\mathrm{\&phi;}}_3+\sqrt{{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="9924882800082.png,9924882800092.png"\; state="\{\{state\}\}">d</figure-callout>}}_2}{2}\right)}^2-{\left(\frac{b}{2}\right)}^2{\&rsqb;}^2}+B_1^2}-{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="9924882800082.png,9924882800092.png"\; state="\{\{state\}\}">d</figure-callout>}}_2$

When the profile of screw rod changes to some extent, for example, become conical surface by the cylndrical surface, adopt non-wide tooth also can increase the star-wheel diameter, the formula of star-wheel diameter increment is wanted corresponding change or is obtained with graphing method at this moment.All can draw Δ d with any method ₂Value.

The difference of non-wide tooth and wide tooth has only just changed the width of left and right half tooth because of the change of bus position, the Surface of action of star-wheel (side) remains the conjugate surface of screw tooth surface, and the processing of its processing and screw rod teeth groove only needs that cutter is done corresponding displacement and gets final product.

The utility model contrast prior art has following advantage:

1, increases discharge capacity, raising Energy Efficiency Ratio. Since adopt non-wide tooth can increase the star-wheel diameter, as previously mentioned: Increase the star-wheel diameter and not only increase discharge capacity but also improve Energy Efficiency Ratio. Existing theoretical displacement is 2.2m³Single screw compression of/min Machine adopts non-its discharge capacity of wide tooth can increase more than 20%, and Energy Efficiency Ratio can improve more than 5%; When the screw head number is 4, star-wheel The number of teeth is 7 o'clock, and the raising of Energy Efficiency Ratio can surpass 10%.

2, when improving Energy Efficiency Ratio, also reduce the volume and weight of compressor. The increase of star-wheel diameter makes compressor Discharge capacity increase, when needs keep discharge capacity constant, should reduce the diameter of screw rod, thereby make compressor improve efficiency Its volume and weight also slightly reduces in the time of ratio.

3, develop the good condition of having created for single screw compressor to float amount direction.The discharge capacity of single screw compressor is littler, and its energy consumption index is poorer, is difficult to and other machine competition.The minimum power of motor of present single screw rod air conditioner is 30kw, and after non-wide tooth raising Energy Efficiency Ratio, can produce power of motor is single screw rod air conditioner of 15kw.Small-sized, energy-conservation high pressure single screw compressor also more meets the needs of defence engineerings such as submarine.

4, improve the rigidity of star-wheel carriage, to prolong the life-span of star-wheel.

Claims (2)

1, a kind of energy-saving single-bolt compressor comprises main shaft and body, it is characterized in that, also comprises screw rod and star-wheel, and the bus of star-wheel tooth and arranged on left and right sides is unequal to the distance at star-wheel running center, and star-wheel tooth and screw rod tooth are non-wide tooth.

2, energy-saving single-bolt compressor according to claim 1 is characterized in that, the screw rod teeth groove is darker, and its intensification value is Δ d ₂/ 2.

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