CN201779910U - Active air distribution system of compressor for low-temperature refrigerator - Google Patents

Abstract

The utility model discloses an active air distribution of a compressor for a low-temperature refrigerator, which comprises a compressor, a compressor exhaust valve, a compressor air inlet valve, a refrigerator component heat regenerator and a refrigerator component vascular tube, wherein a compressor outlet is sequentially connected with the compressor air inlet valve, the refrigerator component heat regenerator and the refrigerator component vascular tube; a compressor inlet is sequentially connected with the compressor exhaust valve and the refrigerator component heat regenerator; more than one active air distribution device is arranged at an inlet of the refrigerator component heat regenerator in parallel; and the active air distribution device comprises an intermediate air reservoir valve and an intermediate air reservoir which are connected. According to the utility model, the air inlet and exhaust processes of the intermediate air reservoir is added in the refrigeration circulating, the air distribution amount of the compressor and the power consumption of the air distribution amount of the compressor can be reduced and the irreversible loss of the air distribution system can be reduced, thereby the aims of improving the performance of the refrigerator, improving the operation condition of the air distribution system and prolonging the service life of the air distribution system can be achieved.

Description

A kind of active gas distribution system of compressor used for cryogenic refrigerator

Technical field

The utility model relates to Cryo Refrigerator, relates in particular to a kind of active gas distribution system of compressor used for cryogenic refrigerator.

Background technology

Traditional air distributing method of Cryo Refrigerator is realized by compressor and intake and exhaust by-pass valve control.Once circulation comprises compressor intake process and compressor air-discharging process.

It is for refrigeration machine provides gases at high pressure that compressor mainly acts on, and reclaims the low-pressure gas that refrigeration machine is discharged.Its operation principle is: the low pressure helium is compressed in the compressor pump assembly, carry out preliminary Oil-gas Separation after, become the high-pressure helium of oil-containing, via heat exchanger, gs-oil separator and absorber, obtain the helium of high-purity high pressure at last.For the air distribution system that is adopted in the present Cryo Refrigerator, compressor is compressed to gases at high pressure with all low-pressure gases of discharging from refrigeration machine in cyclic process each time, and it is bigger to compress this part distribution amount wasted work.

At present the air distributing device that adopts mainly contains two kinds of rotary valve and magnetic valves.With the rotary valve is example, and its principle is by spool rotation carrying out high pressure admission and low pressure exhaust.There is big pressure reduction in its spool during work, causes bigger restriction loss.Simultaneously, the spool rotation need overcome bigger frictional resistance, produces noise and causes serious mechanical wear.The Powdered chip that wearing and tearing produce can cause valve blockage or pollute regenerator matrix.Finally cause the deterioration of refrigeration machine performance.Be the frictional force when overcoming the rotary valve switching simultaneously, require motor that bigger moment of torsion is provided, cause motor load excessive.For magnetic valve, its principle is the switch by height Control of Voltage valve, thereby breathing action is regulated.The pressure reduction that bears before and after the valve also causes bigger restriction loss.Simultaneously, higher differential pressure makes the magnetic valve operating condition worsen, and has reduced the magnetic valve life-span.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of active gas distribution system of compressor used for cryogenic refrigerator is provided.

The active gas distribution system of compressor used for cryogenic refrigerator comprises compressor, the compressor air-discharging valve, the compressor air intake valve, refrigeration machine parts regenerator and refrigeration machine parts vascular, compressor outlet and compressor air intake valve, refrigeration machine parts regenerator is connected successively with refrigeration machine parts vascular, compressor inlet is connected with refrigeration machine parts regenerator successively with the compressor air-discharging valve, the porch parallel connection of described refrigeration machine parts regenerator is provided with the active air distributing device more than 1, and active air distributing device comprises middle air reservoir valve and the middle air reservoir that is connected.

Described compressor air-discharging valve, compressor air intake valve and middle air reservoir valve are magnetic valve or the rotary valve that comprises high-pressure channel, middle pressure channel and low-pressure channel.

The beneficial effect that the utility model compared with prior art has:

1) the active air distributing method of employing compressor used for cryogenic refrigerator, middle air reservoir can provide Continuous pressure-controlled air inflation for refrigeration machine in intake process, reclaims the portion gas that refrigeration machine is discharged in exhaust process.Compare with traditional compressor distribution mode, can reduce compressor distribution amount, thereby reach the effect that reduces this part distribution amount wasted work of compression;

2) active gas distribution system of employing compressor used for cryogenic refrigerator, advance, compressor air intake valve, compressor air-discharging valve and middle air reservoir valve working pressure reduction are less in the deflation course, the irreversible loss that valve mechanical wear and throttling produce can be effectively reduced, and work noise can be reduced;

3) the utility model can be so that the operating mode of air distribution system improves, and makes prolong the service life of the whole air distribution system that comprises compressor and gas distribution valve, for the commercialization and the practicability of refrigeration machine provides technical support.

Description of drawings

Fig. 1 is the active gas distribution system structural representation that contains the compressor used for cryogenic refrigerator of 1 active air distributing device;

Fig. 2 is the active gas distribution system structural representation that contains the compressor used for cryogenic refrigerator of active air distributing device more than 2;

Fig. 3 is the active gas distribution system control sequential chart that contains the compressor used for cryogenic refrigerator of 1 active air distributing device;

Fig. 4 is the control sequential chart that contains the active gas distribution system of the compressor used for cryogenic refrigerator of active air distributing device more than 2.

The specific embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated:

As Fig. 1, shown in 2, the active gas distribution system of compressor used for cryogenic refrigerator comprises compressor 1, compressor air-discharging valve 2, compressor air intake valve 3, refrigeration machine parts regenerator 4 and refrigeration machine parts vascular 5, compressor 1 outlet and compressor air intake valve 3, refrigeration machine parts regenerator 4 is connected successively with refrigeration machine parts vascular 5, compressor 1 import is connected with refrigeration machine parts regenerator 4 successively with compressor air-discharging valve 2, described refrigeration machine parts regenerator 4 porch parallel connections are provided with the active air distributing device more than 1, and active air distributing device comprises middle air reservoir valve 6 and the middle air reservoir 7 that is connected.

Described compressor air-discharging valve 2, compressor air intake valve 3 and middle air reservoir valve 6 are magnetic valve or the rotary valve that comprises high-pressure channel, middle pressure channel and low-pressure channel.

The active air distributing method of compressor used for cryogenic refrigerator is:

Shown in Fig. 1,3, when being provided with 1 active air distributing device in refrigeration machine parts regenerator 4 porch, air reservoir intake process, compressor intake process, middle air reservoir exhaust process and compressor air-discharging process in the middle of kind of refrigeration cycle comprises.In middle intake process, middle air reservoir valve 6 is opened, and 7 pairs of refrigeration machines of middle air reservoir carry out air inlet.After refrigerating device inner pressure arrived setting value, middle air reservoir valve 6 was closed, and middle air reservoir intake process finishes.In the compressor intake process, compressor air intake valve 2 is opened, and 1 pair of refrigeration machine of compressor carries out high pressure admission.After refrigerating device inner pressure reached high pressure, compressor air intake valve 3 was closed, and the compressor intake process finishes.Gases at high pressure begin middle air reservoir exhaust process after refrigeration machine acting process finishes.Middle air reservoir valve 6 is opened, and middle air reservoir 7 reclaims refrigeration machine and discharges gas.After refrigerating device inner pressure was reduced to a certain setting value, middle air reservoir valve 6 was closed, and middle air reservoir exhaust process finishes, and the compressor air-discharging process begins.In the compressor air-discharging process, compressor air-discharging valve 3 is opened, compressor 1 reclaims refrigeration machine and discharges gas, so that reduce compressor distribution amount and compression distribution amount wasted work, reduce the irreversible loss of air distribution system, improve the refrigeration machine performance, improve the air distribution system operating condition and prolong the air distribution system life-span.

As Fig. 2, shown in 4, when refrigeration machine parts regenerator 4 porch are provided with N active air distributing device, N＞1, kind of refrigeration cycle comprises the middle air reservoir intake process of one-level, the middle air reservoir intake process of secondary to the middle air reservoir intake process of N-1 level, the middle air reservoir intake process of N level, compressor intake process, the middle air reservoir exhaust process of N level, and the middle air reservoir exhaust process of N-1 level is to the middle air reservoir exhaust process of secondary, the middle air reservoir exhaust process of one-level and compressor air-discharging process.In the air reservoir intake process, air reservoir valve 8 is opened in the middle of the one-level in the middle of one-level, and 9 pairs of refrigeration machines of air reservoir carry out air inlet in the middle of the one-level.After the refrigerating device inner pressure arrival setting value, the air reservoir intake process finishes in the middle of the one-level, carries out the middle air reservoir intake process of secondary successively to the middle air reservoir intake process of N level.In the air reservoir intake process, air reservoir valve 10 is opened in the middle of the N level in the middle of the N level, and 11 pairs of refrigeration machines of air reservoir carry out air inlet in the middle of the N level.After refrigerating device inner pressure arrived setting value, middle air reservoir intake process finished, and the compressor intake process begins.In the compressor intake process, compressor air intake valve 2 is opened, and 1 pair of refrigeration machine of compressor carries out air inlet.After refrigerating device inner pressure arrived high pressure, compressor air intake valve 2 was closed, and the compressor intake process finishes.Gases at high pressure are after refrigeration machine acting process finishes, and the air reservoir exhaust process begins in the middle of the N level.In the air reservoir exhaust process, air reservoir valve 10 is opened in the middle of the N level in the middle of the N level, and air reservoir 11 reclaims refrigeration machine and discharges gas in the middle of the N level.After refrigerating device inner pressure was reduced to a certain setting value, air reservoir valve 10 was closed in the middle of the N level, and the air reservoir exhaust process finishes in the middle of the N level, carried out the middle air reservoir exhaust process of N-1 level successively to the middle air reservoir exhaust process of one-level.In the air reservoir exhaust process, air reservoir valve 8 is opened in the middle of the one-level in the middle of one-level, and air reservoir 9 reclaims the intermediate-pressure gas that refrigeration machine is discharged in the middle of the one-level.After refrigerating device inner pressure was reduced to setting value, air reservoir valve 8 was closed in the middle of the one-level, and air reservoir 9 exhaust processes finish in the middle of the one-level, and the compressor air-discharging process begins.In the compressor air-discharging process, compressor air-discharging valve 2 is opened, and compressor 1 reclaims the low-pressure gas that refrigeration machine is discharged.

Traditional air distribution system and active gas distribution system are carried out theory calculating, given parameter:

Refrigeration machine air inlet high pressure (compressor high pressure) p _H, refrigeration machine exhaust low pressure (refrigeration machine low pressure) p _L, middle air reservoir pressure is p _M, vessel volume V _P, the regenerator void volume is V _R, vascular and regenerator hot-side temperature T _H, cold junction temperature T _L, room temperature T ₀, compressor inlet temperature T ₁, the compressor adiabatic efficiency is η, adiabatic exponent γ, specific heat capacity at constant pressure C _p, constant R _g

Under traditional distribution mode, compressor distribution amount is:

$m=(p_H-p_L)\frac{V_P+V_R}{R_g(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}$

Suppose that compressor is irreversible adiabatic compression, the corresponding wasted work of distribution amount is:

$W=(p_H-p_L)\frac{V_P+V_R}{\mathrm{\ηR}(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}{C}_P{T}_1[{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-1]$

The entropy of air distribution system produces and comprises that the irreversible compression entropy of compressor produces, and the valve entropy of compressor intake process produces and the valve entropy of compressor air-discharging process produces.Wherein, intake process can be regarded as constant pressure before the throttling and (is compressor high pressure p _H) and after the throttling pressure increase gradually (from low pressure p _LTo high pressure p _H) process.Pressure reduced gradually (from high pressure p before intake process was regarded throttling as _HTo low pressure p _L) and after the throttling constant pressure (be compressor low pressure p _H) process.

Then the air distribution system entropy produces and is:

$S_{\mathrm{gen}}=\frac{(p_H-p_L)(V_P+V_R)}{T_H-T_L}\mathrm{In}\frac{T_H}{T_L}\left[\frac{C_p}{R_g}\ln \frac{{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-(1-\mathrm{\η})}{\mathrm{\η}}\right]$

The above results shows if can (guarantee that promptly the refrigerating device inner pressure ratio does not reduce) under the prerequisite that does not influence the overall refrigeration performance of refrigeration machine, reduce the pressure differential in the compressor distribution process, then can reach the effect that reduces compression distribution amount consumption and required wasted work thereof, can significantly reduce the valve irreversible loss simultaneously.

To contain 1 active air distributing device is example, then:

Compressor distribution amount is in the active gas distribution system:

$m^{\′}=(p_H-p_M)\frac{V_P+V_R}{R_g(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}$

Distribution amount wasted work is in the active gas distribution system:

$W^{\′}=(p_H-p_M)\frac{V_P+V_R}{\mathrm{\η}{R}_g(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}{C}_P{T}_1[{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-1]$

The active gas distribution system entropy produces:

$S_{\mathrm{gen}}^{\′}=\frac{(V_P+V_R)}{T_H-T_L}\mathrm{In}\frac{T_H}{T_L}[(p_H-p_M)\frac{C_p}{R_g}\ln \frac{{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-(1-\mathrm{\η})}{\mathrm{\η}}+({2p}_M-p_H-p_L)\mathrm{In}\frac{p_M}{p_L}]$

Compare with traditional air distribution system,

Compressor distribution amount reduces:

$\mathrm{\Δm}=(p_M-p_L)\frac{V_P+V_R}{R_g(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}$

Compressor distribution amount wasted work reduces:

$\mathrm{\ΔW}=(p_M-p_L)\frac{V_P+V_R}{\mathrm{\η}{R}_g(T_H-T_L)}\mathrm{In}\frac{T_H}{T_L}{C}_P{T}_1[{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-1]$

The air distribution system entropy produces and reduces:

$\mathrm{\Δ}{S}_{\mathrm{gen}}=\frac{(V_P+V_R)}{T_H-T_L}\mathrm{In}\frac{T_H}{T_L}[(p_M-p_L)\frac{C_p}{R_g}\ln \frac{{\left(\frac{p_H}{p_L}\right)}^{\frac{\mathrm{\γ}-1}{\mathrm{\γ}}}-(1-\mathrm{\η})}{\mathrm{\η}}+(p_H+p_L-2p_M)\mathrm{In}\frac{p_M}{p_L}]$

Result of calculation shows that active gas distribution system can reduce compressor distribution amount and compression distribution amount wasted work, reduces the irreversible loss of air distribution system.

So far, preferred embodiment of the present utility model has been described.Yet the utility model is not limited to above-mentioned preferred embodiment, and those skilled in the art are not departing under the described situation of claim of the present utility model and can make modification to the utility model.

Claims (2)

1. the active gas distribution system of a compressor used for cryogenic refrigerator, comprise compressor (1), compressor air intake valve (2), compressor air-discharging valve (3), refrigeration machine parts regenerator (4) and refrigeration machine parts vascular (5), compressor (1) outlet and compressor air intake valve (2), refrigeration machine parts regenerator (4) is connected successively with refrigeration machine parts vascular (5), compressor (2) import is connected with refrigeration machine parts regenerator (4) successively with compressor air-discharging valve (3), it is characterized in that described refrigeration machine parts regenerator (4) porch parallel connection is provided with the active air distributing device more than 1, active air distributing device comprises middle air reservoir valve (6) and the middle air reservoir (7) that is connected.

2. the active gas distribution system of a kind of compressor used for cryogenic refrigerator according to claim 1 is characterized in that described compressor air intake valve (2), compressor air-discharging valve (3) and middle air reservoir valve (6) are magnetic valve or the rotary valve that comprises high-pressure channel, middle pressure channel and low-pressure channel.

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