CN100532895C - Plane rotating valve with high and low pressure air chamber - Google Patents

Abstract

The invention discloses a plane rotation valve with a high-pressure air chamber and low-pressure air chamber, comprising a low pressure passage, a connection regenerator passage, a high voltage opening, a low pressure trough, an air chamber, a motor, a spring, a valve core, a chassis, a valve body, a regenerator heat end interface, a high pressure inlet and a low pressure outlet; the bottom of the valve body is provided with the motor; the rotation shaft of the motor is provided with the spring and the valve core; the valve core is provided with the chassis which is fixed on the valve body; the valve body side wall below the chassis is provided with the high pressure inlet; the chassis is provided with the low pressure passage and the connection regenerator passage; the low pressure passage is connected with the low pressure outlet which is arranged on the side wall of the valve body; the top of the valve body is provided with the regenerator heat end interface; the upper end surface of the valve core is provided with the high pressure opening, the lower pressure trough and the air chamber; the lower pressure trough is arranged at the center of the upper end surface of the valve core; the high pressure opening is arranged at two sides of the upper end surface of the valve core and vertical to the low pressure trough; the invention can obviously reduce the abrasion of the valve core, prolongs the service life of the valve core, and at the same time reduces the torque by which a rotation valve motor drives the valve core to rotate.

Description

The plane rotating valve that has high and low pressure air chamber

Technical field

The present invention relates to rotary valve, relate in particular to a kind of plane rotating valve that has high and low pressure air chamber.

Background technique

The pulse tube refrigeration machine technology occupies critical role in modern low-temperature refrigeration technology field.Because of its low-temperature end movement-less part, so more reliable than traditional G-M refrigerator and sterlin refrigerator, the no maintenance operation time prolongs greatly, and prospect therefore has a very wide range of applications at aspects such as space flight, military affairs.

According to the distribution form, vascular refrigerator is divided into two classes, and a class is a G-M type vascular refrigerator, and another kind of is the stirling-type vascular refrigerator.The former adopts switch valve to connect between mechanical compressor and vascular refrigerator, it is our usually said plane rotating valve, compression and inflation process by gas in the opening and closing control vascular refrigerator of control high low pressure end valve door, thereby the cool end heat exchanger at refrigerator produces refrigeration effect, and frequency of okperation is generally below 10Hz.The stirling-type vascular refrigerator directly links to each other with compressor, and the pressure wave that is produced by compressor directly drives, and is generally operational in more than the 15Hz.At present, G-M type vascular refrigerator only drives a kind of pattern by mechanical compressor, and sterlin refrigerator mainly contains the Linearkompressor driving and thermoacoustic engine drives two kinds of driving patterns.

The basic principle of G-M type vascular refrigerator is to utilize high low pressure gas that the charging and discharging the gas process of vascular cavity obtained refrigeration.Its process of refrigerastion is as follows:

1) pressurized gas enter vascular by flow through regenerator, cool end heat exchanger of controlled switching valve with the laminar flow form, gradually push the interior gas of pipe and move to closed end, make it simultaneously to be squeezed, pressure raises, temperature rises, and reaches peak in the temperature of vascular closed end gas.

2) hot end heat exchanger that is arranged in closed end is taken away heat, makes the interior gas of pipe because of its temperature and pressure of heat release reduction be arranged slightly.

3) switching valve rotates and to make gas and the direct UNICOM of gas source low pressure side system in, and the gas in the vascular is expanded to the source of the gas passing gradually with laminar flow again, gas expansion step-down and obtain low temperature.

4) switching valve is changed once more, and system is communicated with the source of the gas high pressure side, repeats above-mentioned circulation.

Here, rotary valve is important distribution parts, and it has finished the switching of interior compression of vascular refrigerator and inflation process.The relative time length of said compression process and inflation process is by the time-oriented sequential control of rotary valve.

G-M type vascular refrigerator frequency of okperation is low, and the difference between its high and low pressure is big, and pressure ratio can reach more than 2 during general work.In this case, the spool of rotary valve is between the high low pressure, tightly is pressed on the chassis of rotary valve, and the rotary valve rotation is switched need overcome very big frictional force, and therefore driving the spool motor rotating just need provide bigger moment of torsion.Because the frictional force that the spool rotation will overcome is bigger, the wearing and tearing meeting of spool is more serious, the regenerator that the Powdered dirt that produces owing to wearing and tearing enters vascular refrigerator can make regenerative material valve place contaminated or that get lodged in the bidirection air intake valve change the flow coefficient of valve, and these all can directly influence the performance of vascular refrigerator.When the refrigerator long-play, the wearing and tearing meeting of spool directly influences the performance even the working life of refrigerator.

At present, vascular refrigerator requires that bigger refrigerating capacity is arranged, and by studies show that, high inflation pressure has tangible benefit to the raising of refrigerating capacity.Yet high inflation pressure is when obtaining bigger refrigerating capacity, because high low pressure pressure reduction increases, rotary valve spool wear problems just all the more looms large, and is badly in need of solving.

Summary of the invention

The purpose of this invention is to provide a kind of plane rotating valve that has high and low pressure air chamber.

The plane rotating valve that has high and low pressure air chamber comprises low-pressure channel, connect the regenerator passage, the high pressure opening, trough of low pressure, air chamber, motor, spring, spool, the chassis, valve body, regenerator hot junction interface, high-pressure inlet, low tension outlet, the valve body bottom is provided with motor, motor rotation axis is provided with spring, spool, spool is provided with the chassis, the chassis is fixed on the valve body, the body wall of below, chassis is provided with high-pressure inlet, the chassis is provided with low-pressure channel, connect the regenerator passage, low-pressure channel and body wall are provided with low tension outlet and join, the valve body top is provided with regenerator hot junction interface, the spool upper-end surface is provided with the high pressure opening, trough of low pressure, air chamber, trough of low pressure is arranged on center, spool upper-end surface, and the high pressure opening is arranged on that both sides, spool upper-end surface are vertical with trough of low pressure to be located.

The present invention is by introducing high and low pressure air chamber on spool and chassis surface of contact, high and low pressure gas is guided on the surface of contact, successfully reduced when spool rotates and the frictional force on the surface of contact of chassis, the wearing and tearing of spool and the Powdered impurity of bringing system owing to wearing and tearing into have been reduced, because spool rotates needed moment of torsion and reduces, reduced the load of motor simultaneously.

Description of drawings

Fig. 1 (a) is the plane rotating valve structural representation that has high and low pressure air chamber;

Fig. 1 (b) is the plane rotating valve chassis section A-A schematic representation that has high and low pressure air chamber;

Fig. 1 (c) is the plane rotating valve valve core structure schematic representation that has high and low pressure air chamber;

Fig. 1 (d) is the plane rotating valve spool section B-B schematic representation that has high and low pressure air chamber;

Fig. 2 (a) is the preceding halftime working procedure of plane rotating valve spool that has high and low pressure air chamber;

Fig. 2 (b) is that the plane rotating valve spool upper gas chamber A, the C internal pressure that have high and low pressure air chamber change;

Fig. 2 (c) is that the plane rotating valve spool upper gas chamber B, the D internal pressure that have high and low pressure air chamber change;

Fig. 3 (a) is the pressure waveform that has the plane rotating valve generation of high and low pressure air chamber;

Fig. 3 (b) is the pressure waveform that the common plane rotary valve produces;

Fig. 3 (c) has the plane rotating valve of high and low pressure air chamber and common plane rotary valve to the refrigerator Effect on Performance;

Among the figure: low-pressure channel 1, connection regenerator passage 2, high pressure opening 3, trough of low pressure 4, air chamber 5, motor 6, spring 7, spool 8, chassis 9, valve body 10, regenerator hot junction interface 11, high-pressure inlet 12, low tension outlet 13.

Embodiment

As shown in Figure 1, the plane rotating valve that has high and low pressure air chamber comprises low-pressure channel 1, connect regenerator passage 2, high pressure opening 3, trough of low pressure 4, air chamber 5, motor 6, spring 7, spool 8, chassis 9, valve body 10, regenerator hot junction interface 11, high-pressure inlet 12, low tension outlet 13, valve body 10 bottoms are provided with motor 6, motor 6 rotatingshafts are provided with spring 7, spool 8, spool 8 is provided with chassis 9, chassis 9 is fixed on the valve body 10, valve body 10 sidewalls of 9 belows, chassis are provided with high-pressure inlet 12, chassis 9 is provided with low-pressure channel 1, connect regenerator passage 2, low-pressure channel 1 joins with the low tension outlet 13 that valve body 10 sidewalls are provided with, valve body 10 tops are provided with regenerator hot junction interface 11, spool 8 upper-end surfaces are provided with high pressure opening 3, trough of low pressure 4, air chamber 5, trough of low pressure 4 is arranged on center, spool 8 upper-end surface, and high pressure opening 3 is arranged on both sides, spool 8 upper-end surface and trough of low pressure 4 vertical locating.

Chassis 9 is the stator of rotary valve, is fixed on the valve body 10, and spool 8 is the rotor of rotary valve, and spool drives by motor, with certain frequency rotation.When valve element position as shown in Fig. 1 a during the position, trough of low pressure 4 with low-pressure channel 1 be connected regenerator passage 2 and be communicated with, this moment, vascular refrigerator just was communicated with the low voltage side of compressor.Spool in the relative Fig. 1 a of valve element position has rotated 90 °, when forming as Fig. 1 c position, connects regenerator passage 2 and is communicated with hyperbaric chamber in the valve body via high pressure opening 3, and vascular refrigerator is communicated with the high pressure side of compressor at this moment.So, make vascular refrigerator, be communicated with the distribution process of Here it is plane rotating valve respectively with the high and low pressure of compressor with certain switching frequency by the rotation of spool.

The rotation of spool can make high and low pressure air chamber 5 be communicated with trough of low pressure 4 and high pressure opening 3 via connecting regenerator passage 2 compartment of terrains respectively, can fill into high pressure and low-pressure gas in the compartment of terrain in the air chamber 5 like this.In rotary valve when work,, the gas pressure change rule in two air chambers that the diagonal angle is arranged in four air chambers is identical, and high pressure and low pressure are switched at interval, are cyclically-varying.Variation in pressure on the spool in the high and low pressure air chamber does not influence the normal distribution of refrigerator, and the relative position on its half period of rotation inner spool and chassis is shown in Fig. 2 (a).The gas pressure change situation is identical in air chamber A, the C, and one-period internal pressure situation of change is shown in Fig. 2 (b); The gas pressure change situation is identical in air chamber B, the D, and one-period internal pressure situation of change is shown in Fig. 2 (c).

Analyze the stressing conditions of spool.Positive pressure F between spool and the chassis _tFor:

F _t＝∫(p _h-p(r，t))dA (1)

Integration is along the outermost profile line of spool among Fig. 1 d in the formula, i.e. the integration of the area of outermost circle, p _hBe the pressure of compressor high pressure, p (r, t) spool and the interior diverse location of chassis contact circle and the pressure in the different moment.

The frictional force dF that is produced owing to the spool rotation on spool and the chassis surface of contact _WBe positive pressure F _tFunction with coefficient of kinetic friction f

${\mathrm{dF}}_W=-f\frac{F_t}{A_c}{\mathrm{dA}}_c---\left(2\right)$

A in the formula _cArea of contact for spool and chassis.So spool rotates needed moment of torsion τ _WFor

dτ _W＝rdF _W (3)

So the total torque representation is

${\mathrm{\τ}}_W=\frac{F_t}{A_c}f\∫{\mathrm{rdA}}_c---\left(4\right)$

Adopt said method to using common spool and using under the two kinds of conditions of spool that have high and low pressure air chamber and carry out theoretical calculation, under inflation pressure 2.1MPa operating mode, high pressure is 2.42MPa during refrigerator work, low pressure is 1.06MPa, obtain a result for: use the spool have high and low pressure air chamber to use common spool frictional force to reduce 4.4%, drive the needed moment of torsion of spool electric rotating machine and reduced 9.4%.

Adopt common spool respectively and have under two kinds of situations of spool of high and low pressure air chamber, the waveform that is produced is shown in Fig. 3 (a), Fig. 3 (b).Can reach a conclusion, the introducing of high and low pressure air chamber can't influence the pressure wave that former distribution system is produced.Equally from Fig. 3 (c) also as can be seen, adopt the spool have high and low pressure air chamber not influence the performance of refrigerator.The temperature of refrigerator cold head was all in the present zone of reasonableness of laboratory data repeatedly when lowest refrigerating temperature and refrigerating capacity were 20W.

Claims (1)

1. plane rotating valve that has high and low pressure air chamber, it is characterized in that comprising low-pressure channel (1), connect regenerator passage (2), high pressure opening (3), trough of low pressure (4), air chamber (5), motor (6), spring (7), spool (8), chassis (9), valve body (10), regenerator hot junction interface (11), high-pressure inlet (12), low tension outlet (13), valve body (10) bottom is provided with motor (6), motor (6) rotatingshaft is provided with spring (7), spool (8), spool (8) top is provided with chassis (9), chassis (9) is fixed on the valve body (10), valve body (10) sidewall of below, chassis (9) is provided with high-pressure inlet (12), chassis (9) is provided with low-pressure channel (1), connect regenerator passage (2), low-pressure channel (1) joins with the low tension outlet (13) that valve body (10) sidewall is provided with, valve body (10) top is provided with regenerator hot junction interface (11), spool (8) upper-end surface is provided with high pressure opening (3), trough of low pressure (4), air chamber (5), trough of low pressure (4) is arranged on spool (8) center, upper-end surface, and high pressure opening (3) is arranged on spool (8) both sides, upper-end surface and the vertical place of trough of low pressure (4).

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