CN202431977U - Novel air distribution device for low-temperature refrigerator - Google Patents

Abstract

The utility model discloses a novel air distribution device for a low-temperature refrigerator. The device comprises a linear motor (1), a cover body (2), a main shaft (3), a valve seat (4) and a valve core (5). The device is characterized in that the linear motor (1) is arranged on the valve seat (4); the cover body (2) covers the motor and is arranged on the valve seat (4) through a bolt (15); the valve seat (4) and the cover body (2) are sealed by adopting an O-shaped ring (14); an air cavity (10) is formed in the valve seat (4), and the valve core (5) is arranged in the air cavity (10); and one end of the main shaft (3) is axially connected with the valve core (5) through threads, and the other end of the main shaft (3) is driven by the linear motor (1) to linearly reciprocate. According to the device, the magnitude of circulated air quantity and the opening and closing time sequence of valves can be adjusted in real time according to the change condition in operation of the refrigerator, abrasion between the valve core and the valve seat is low, and leakage can be avoided, so that the stability and the reliability of the refrigerator can be greatly improved, and the service life of the refrigerator is prolonged.

Description

A kind of novel air distributing device that is used for Cryo Refrigerator

Technical field

The utility model relates to the gas distribution valve that a kind of Cryo Equipment is used, and especially a kind ofly can regulate the gas distribution valve of air-flow size and air-flow phase place being used for Cryo Refrigerator.

Background technique

Usually the common feature of Ji Fute-McMahon (GM) refrigerator and GM type vascular refrigerator and Sol literary composition refrigerator all is to adopt the turnover of gas distribution valve control working medium fluid.Traditional gas distribution valve generally adopts plane rotating valve structural type, comprises a stator and a mover.Accomplish the switching and the time sequence control of airflow through the design of the pore shape on stator and the mover.Traditional plane rotating valve is in case design is accomplished, and the size of its distribution and sequential just can not be adjusted.Surface of contact existence wearing and tearing between stator and the mover in this gas distribution structure; Be prone to produce contamination particle; In the long-time running process, if be deposited in the duct of phase modulation mechanism, the bidirection air intake aperture in the vascular refrigerator for example; Air-flow size and the sequential phase relationship optimum value during with off-design, this performance impact to refrigerator especially vascular refrigerator is very big.In addition, when operating conditionss such as ambient temperature changed, the refrigerator performance also possibly take place than about-face, and this also need adjust the size and the phase place of the air-flow that gets into parts such as regenerator, vascular again.

Summary of the invention

When worsening appearred in the refrigeration machine performance, the problem that distributing valve is big or small to air-flow and sequential can't effectively be adjusted designed a kind of gas distribution valve based on ruuning situation adjustment air-flow size and phase place to existing refrigeration machine.

The technological scheme of the utility model is:

A kind of novel air distributing device that is used for Cryo Refrigerator comprises linear electric motor, cover body, main shaft, valve seat and spool, and linear electric motor are installed on the valve seat; The motor outside is with a cover body, through bolt cover body is installed on the valve seat; Adopt the sealing of " O " type circle between valve seat and the cover body; Be provided with air cavity in the valve seat, spool is installed in the air cavity; To being connected, an other end is driven by linear electric motor, does straight reciprocating motion through thread spindle for main shaft one end and spool; Do coning the spool bottom; Have first passage and second channel on the valve seat; Have the pore that is communicated with extraneous source of the gas on the cover body, the inner space that is surrounded of cover body forms the constant voltage chamber; First passage one end is communicated with an other end and air cavity vertical connection through the constant voltage chamber with pore; Air cavity bottom and second channel with axially be communicated with.

Form the gap of 10 ~ 20 μ m between the air cavity wall on described spool outer wall and the valve seat.

Described air cavity bottom is provided with 120 ° of cone angles, and the air cavity bottom axially is communicated with second channel one end.

The other end of described second channel is communicated with regenerator or vascular.

Described air cavity internal diameter is than the big 1 ~ 2mm of second channel internal diameter.

Described spool is the polyimide spool, and do coning the bottom, and the tapering size is 2 ~ 10 °; Spool center of top place has thread groove.

The material of described valve seat is a stainless steel.

Said air distributing device is applicable to any type of periodically Cryo Refrigerator of distribution that needs.

The beneficial effect of the utility model:

The size of gas flow can realize through the stroke of regulating motor in the utility model; Gas phase place size can open and close relative time length through control valve and accomplish, and therefore under running status, can adjust the refrigeration machine performance based on the variation of running status.In addition, directly contact between spool and the valve seat, spool is along the axis linear motion; Just contact or break away from two states with passage; Therefore the existence of no kinetic friction between both surface of contact has significantly reduced the wearing and tearing of spool, and this will help the reliability and the long lifetime of refrigerator.

Description of drawings

Fig. 1 is the gas distribution valve and the twin-stage pulse tube type refrigerator annexation schematic representation of the utility model.

Fig. 2 is the utility model distributing valve valve seat part section structural representation.

Fig. 3 a is a spool knot top structure schematic representation.

Fig. 3 b is the overall structure schematic representation of spool.

Fig. 4 a is a valve when closing fully, the gas distribution valve cross-sectional view.

Fig. 4 b analyses and observe along A-A direction among Fig. 4 a.

Fig. 5 a is a valve when opening fully, the gas distribution valve cross-sectional view.

Fig. 5 b is along A-A direction sectional view among Fig. 5 a.

Fig. 6 is spool travel and sequential in the utility model, tolerance corresponding relation figure.

Fig. 7 is initiatively distribution twin-stage vascular refrigerator sequential charts of 8 valves.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further explanation.

Shown in Fig. 1 ~ 5, shown in Figure 1 is gas distribution valve and twin-stage pulse tube type refrigerator annexation schematic representation.Fig. 1 left side is gas distribution valve schematic representation (the right side refrigerator can be single-stage or multi-stage refrigerating machine among Fig. 1).During practical implementation, according to actual requirement, the quantity of valve can be 4 ~ 8, and each valve is relatively independent, is independent of each other.During practical implementation, this novel air distributing device comprises linear electric motor 1, cover body 2, main shaft 3, valve seat 4 and spool 5.Linear electric motor 1 are installed on the valve seat 4; The motor outside is with a cover body 2, through bolt 15 cover body 2 is installed on the valve seat 4; Adopt round section joint ring 14 sealings between valve seat 4 and the cover body 2; Spool 5 is installed in the valve seat 4 in the air cavity 10; Main shaft 3 one ends are connected through the screw thread coaxial rigid with spool 5, and an other end is driven by linear electric motor 1, does straight reciprocating motion; Have first passage 8 and second channel 12 on the valve seat 4; Pore 6 is communicated with extraneous source of the gas on the cover body 2, and the cover body 2 inner spaces that surrounded form constant voltage chamber 15; First passage 8 one ends are communicated with an other end and air cavity 10 radial communication through constant voltage chamber 15 with pore 6; 120 ° of cone angle 10-1 are arranged at air cavity 10 bottoms, and axially are communicated with second channel 12.

Shown in Figure 2 for joining valve seat part section structural representation.During practical implementation, vertical valve seat 4 surfaces have an air cavity 10, and there are 120 ° of cone angles the bottom, and axially is communicated with second channel 12; Air cavity 10 internal diameters are greater than second channel 12 internal diameters 1 ~ 2mm; Radially have first passage 8 along air cavity, first passage 8 other ends are communicated with constant voltage chamber 15.

Fig. 3 a, Fig. 3 b are depicted as the valve core structure schematic representation.During practical implementation, the material of spool 5 can be selected polyimide for use, and it is 2 ~ 10 ° conical 5-2 that tapering can be done in the bottom, and top axle can be connected with the main shaft 3 of linear electric motor 1 to opening a thread groove 5-1.

Fig. 4 a, Fig. 4 b are valve when closing fully, the gas distribution valve cross-sectional view.During practical implementation, when linear electric motor 1 drive main spindle 3, main shaft drives spool 5 motions, and when moving downward conical 5-2 surface, spool 5 bottoms and contact with second channel 12 openings, valve is closed fully at this moment.

Fig. 5 a, Fig. 5 b are valve when opening fully, the gas distribution valve cross-sectional view.During practical implementation, motor 1 drive main spindle 3 moves upward, and circular 5-2 surface, spool 5 bottoms is separated from second channel 12 openings, at this moment valve open.A-A is depicted as gas duct circulation area to view, and the diameter of the tapered cross-section of spool 5 bottoms is D ₁, the internal diameter of second channel 12 is D ₂, circulation area is:

$A=({\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HDA0000096921200000061.png"\; state="\{\{state\}\}">D</figure-callout>}}_2^2-D_1^2)\mathrm{\&pi;}/4$

When the position in spool 5 rests on air cavity 10 is different, the diameter D of tapered cross-section, spool 5 bottom in A among Fig. 5 a-A view ₁Big young pathbreaker changes, thereby influences the size of circulation area, plays the effect of control gaseous flow, and the position that spool 5 stops in air cavity 10 can be controlled through motor 1.

During practical implementation, can be through the motion state of motor 1 regulating spool 5.T for the first time ₁Be that valve is gradually opened the stage, spool 5 is from upwards operation of closed condition, operation apart from S decision maximal ventilatory volume; t ₃Stage is that maximal ventilatory volume keeps the stage, and this stage motor is out of service, and stop time is t ₃T for the second time ₁Be that valve gradually closes the stage, the running orbit side of this step piston and the t first time ₁The stage operation is opposite, contacts fully with second channel 12 openings up to spool 5; t ₂Stage is the complete dwell period of valve, and linear electric motor 1 are slack, and stop time is t ₂, repeat t for the first time then ₁In the stage, accomplish once circulation.In the whole circulation process, time sequence control is by the time lag t of intermitten service ₁, t ₂, t ₃Control, as shown in Figure 6.

The time of valve opening is:

t _open＝2t ₁+t ₃

The time of valve closing is:

t _close＝t ₂

Set the GM refrigerator at one-period T _oIn need open and close valve door n time (n=1,2,3 ...), satisfy with 1 operation period of motor T:

T _o＝n·T

Satisfy at each stage corresponding phase angle: $\left\{\begin{array}{c}{\mathrm{\&theta;}}_i=\frac{t_i}{n\&CenterDot;T}\&CenterDot;2\mathrm{\&pi;}\\ t_i=\frac{n\&CenterDot;T\&CenterDot;{\mathrm{\&theta;}}_i}{2\mathrm{\&pi;}}\end{array}\right.,\begin{array}{c}i=\mathrm{1,2,3}\\ n=\mathrm{1,2,3},...\end{array}$

Shown in Figure 7 is the initiatively sequential charts of distribution twin-stage vascular refrigerator of 8 valves.Air distributing device can adopt 8 independent air distributing devices in the utility model.Getting into regenerator, one-level vascular, secondary vascular gas phase place size can contact with second channel 12 openings and the separation time relative length decides through valve 5.The stroke decision that the tolerance size is set by linear electric motor 1.

The utility model is applicable to any type of periodically Cryo Refrigerator of distribution that needs.In application process, can from outer bound pair linear electric motor 1 input control signal, adjust the refrigerator performance at any time according to refrigerator changes of properties situation, keep the stability of refrigerator performance.

Claims (8)

1. a novel air distributing device that is used for Cryo Refrigerator comprises linear electric motor (1), cover body (2), main shaft (3), valve seat (4) and spool (5), it is characterized in that linear electric motor (1) are installed on the valve seat (4); The motor outside is with a cover body (2), through bolt (15) cover body (2) is installed on the valve seat (4); Adopt " O " type circle (14) sealing between valve seat (4) and the cover body (2); Be provided with air cavity (10) in the valve seat (4), spool (5) is installed in the air cavity (10); To being connected, an other end is driven by linear electric motor (1), does straight reciprocating motion through thread spindle for main shaft (3) one ends and spool (5); (5-2) done coning in spool (5) bottom; Have first passage (8) and second channel (12) on the valve seat (4); Have the pore (6) that is communicated with extraneous source of the gas on the cover body (2), the inner space that is surrounded of cover body (2) forms constant voltage chamber (15); First passage (8) one ends are communicated with an other end and air cavity (10) vertical connection through constant voltage chamber (15) with pore (6); Air cavity (10) bottom and second channel (12) with axially be communicated with.

2. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1 is characterized in that can forming between air cavity (10) wall (10-2) on described spool (5) outer wall (5-3) and the valve seat (4) gap of 10 ~ 20 μ m.

3. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1 is characterized in that described air cavity (10) bottom is provided with 120 ° of cone angles (10-1), and air cavity (10) axially is communicated with second channel (12) one ends.

4. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 3 is characterized in that the other end of described second channel (12) and regenerator or vascular members.

5. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1 is characterized in that described air cavity (10) internal diameter is than the big 1 ~ 2mm of second channel (12) internal diameter.

6. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1 is characterized in that described spool (5) is the polyimide spool, and (5-2) done coning in the bottom, and the tapering size is 2 ~ 10 °; Spool (5) center of top place has thread groove (5-1).

7. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1, the material that it is characterized in that described valve seat (4) is a stainless steel.

8. a kind of novel air distributing device that is used for Cryo Refrigerator according to claim 1 is characterized in that said air distributing device is applicable to the periodically Cryo Refrigerator of distribution of any type of needs.

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