CN111121333B

CN111121333B - Method of assembling a leaf spring coaxial body

Info

Publication number: CN111121333B
Application number: CN201811289720.9A
Authority: CN
Inventors: 朱绍伟
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2021-10-08
Anticipated expiration: 2038-10-31
Also published as: CN111121333A

Abstract

The invention relates to a method for assembling a coaxial body of a leaf spring, in particular to an installation method of how to maintain a high coaxiality between the piston and the cylinder in a cylinder-piston system with a gap-sealed leaf spring suspended. A leaf spring coaxial body composed of a circular outer positioning circle component, an inner positioning circle component with an inner positioning circle and a leaf spring component; the leaf spring component and one of the outer positioning circle component or the inner positioning circle component are fixed to form a fixed component, the There is a compensation gap between the fixed component and the other one of the outer positioning circle component or the inner positioning circle component; the outer positioning circle and the inner positioning circle are clamped by the clamp to maintain high coaxiality, and the components at the compensation gap are not in contact. Or weld and consolidate to compensate for the gap, and withdraw the fixture to obtain the coaxial body of the leaf spring with high coaxiality between the outer positioning circle and the inner positioning circle. Install the piston or cylinder on the outer positioning circle or the inner positioning circle, then the cylinder and the piston can maintain the same height. Axiality.

Description

Method for assembling leaf spring coaxial bodies

Technical Field

The invention belongs to the technical field of pulse tube refrigerator parts, relates to a method for mounting a coaxial body of a leaf spring, and particularly relates to a method for mounting how to keep high coaxiality between a piston and a cylinder in a cylinder piston system which adopts clearance sealing and has leaf spring suspension.

Background

The room temperature moving piston pulse tube refrigerator is the most efficient cryogenic refrigerator at present, but has one more moving part. If the sealing between the pushing piston and the pushing piston cylinder adopts clearance sealing, the service life can be prolonged. The principle of clearance sealing is that a leaf spring is connected between a pushing piston cylinder and a pushing piston, so that the pushing piston cylinder is not in contact with the pushing piston. The gap between the pushing piston cylinder and the pushing piston is called gap sealing. The gap of the gap seal is several micrometers to tens of micrometers. The smaller the gap, the smaller the blow-by gas, and the higher the cooling efficiency, and ideally the gap is zero. This requires that the pushing piston cylinder and the pushing piston have a high degree of identity to push the piston and cylinder out of contact with each other with a small clearance. The pushing piston cylinder and the pushing piston can adopt the existing high-precision machining to ensure high roundness and precision, but the leaf spring is elastic and has weak deformation after being fixed by a bolt, so that the high coaxiality between the pushing piston cylinder and the pushing piston is difficult to ensure, and thus, the gap between the pushing piston cylinder and the pushing piston needs to be enlarged so as to avoid contact, the air leakage rate is increased, the refrigeration efficiency is reduced, and the pushing piston is inferior to an inertia tube. Therefore, the main flow of the pulse tube refrigerator is still the inertia tube at present.

Leaf springs, although moving, can have a long life if the stress is below the fatigue limit. The same problem is also encountered with compressors. The gap between the cylinder and the piston is suspended by a leaf spring, and high coaxiality between the cylinder and the piston is difficult to achieve, so that the gap has to be large to prevent the piston from contacting with the cylinder. The large clearance produces a large amount of air leakage, which reduces the efficiency of the compressor and thus the efficiency of the refrigerator.

Chinese patent CN105464941 proposes an assembly method in which the pushing piston shaft and the pushing piston are made into a coaxial unit, which can partially solve the assembly difficulty, and the difficulty of maintaining high coaxiality between the pushing piston cylinder and the pushing piston is changed into the difficulty of maintaining high coaxiality between the pushing piston shaft and the pushing piston. If the pushing piston shaft and the pushing piston are not coaxial, secondary processing is carried out to ensure high coaxiality. However, the connection between the pushing piston shaft and the pushing piston is a flat spring, which is flexible in the axial direction and has a large rigidity in the radial direction, but is still flexible compared with metal, so that a common lathe is difficult to machine, and a special machine tool may be required, which is unknown. China 201610928637.6 specifically proposes a method of mounting by using a clamp, but the deformation of the leaf spring caused by tightening the bolt still exists, and high coaxiality is still difficult to guarantee, so that repeated tests are required. Chinese patent 200910273184.8 proposes a method for coaxially installing a cylinder and a piston in a moving magnet vibration exciter, but the method is very general and cannot be specifically operated.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a method for mounting a piston-cylinder piston system with a gap seal and a leaf spring suspension to maintain a high degree of concentricity between the piston and the cylinder.

The purpose of the invention can be realized by the following technical scheme:

one of the objectives of the present invention is to provide a method for assembling a leaf spring coaxial body, which specifically comprises: firstly fixing the leaf spring assembly and one of an outer positioning circle assembly with an outer positioning circle or an inner positioning circle assembly with an inner positioning circle, then coaxially fixing the outer positioning circle and the inner positioning circle by adopting a clamp, ensuring that a compensation gap which is not contacted or is contacted by zero acting force is formed between the leaf spring assembly and the other one of the outer positioning circle assembly or the inner positioning circle assembly, then fixing the compensation gap, and then taking down the clamp to obtain the leaf spring coaxial body.

In the installation, because the outer location circle subassembly of outer location circle subassembly and interior location circle subassembly is fixed by the anchor clamps of high axiality with interior location circle to keep high axiality, because the existence in compensation clearance, there is not strong existence between outer location circle subassembly and the interior location circle subassembly, fixed back, do not have the power of kick-backing, consequently, outer location circle and interior location circle can keep highly coaxial.

Further, the mode of fixing the compensation gap is one or the combination of two of adhesive bonding and welding. Furthermore, the compensation gap is fixed in a combined mode of firstly adopting an adhesive for bonding and then welding;

or the compensation gap is fixed by a combination mode of firstly adopting adhesive for bonding and then welding, and the adhesive is removed after the fixation.

Furthermore, the adhesive adopts epoxy resin adhesive; the welding adopts low thermal stress welding such as laser or electron beam.

Further, the process of coaxially fixing the outer positioning circle and the inner positioning circle by adopting the clamp specifically comprises the following steps:

and (3) taking the clamp with two coaxial clamp positioning circles, and fixing the two clamp positioning circles with the outer positioning circle and the inner positioning circle respectively to ensure that the outer positioning circle and the inner positioning circle are coaxial.

Furthermore, the clamp is made of a material with a different linear expansion coefficient from the inner positioning circle assembly and the outer positioning circle assembly, so that the clamp can clamp the outer positioning circle and the inner positioning circle in a heating or cooling mode. Specifically, if interior location circle subassembly and outer location circle subassembly etc. adopt materials such as aluminium, then anchor clamps can adopt stainless steel, or the line coefficient of expansion is littleer alloy, like invar alloy etc. also stands conversely, just so, just can adjust the installation through the method of adopting heating or cooling to accomplish the fixed of anchor clamps and interior location circle and outer location circle, and then keep the high axiality of interior location circle and outer location circle.

Furthermore, one of the outer positioning circle or the inner positioning circle, which is not fixed with the leaf spring assembly in advance, is an inner circle of a cylinder on the cylinder assembly or an outer circle of a piston on the piston assembly.

In the method, the clamp can be replaced by a clamping mechanism with two concentric equivalent clamp positioning circles with variable diameters, such as a three-jaw structure for clamping a machine tool with variable diameters.

The invention also provides a piston assembly, a leaf spring assembly and a cylinder assembly mounting method, which comprises the following steps:

(1) taking a leaf spring assembly with a leaf spring positioning circle, a piston assembly with a piston positioning circle and a cylinder assembly with a cylinder positioning circle;

(2) taking one of a leaf spring positioning circle and a piston positioning circle or a cylinder positioning circle as an inner positioning circle and an outer positioning circle, coaxially fixing the inner positioning circle and the outer positioning circle by using a clamp, and ensuring that a compensation gap with any position interval larger than 0 exists between a leaf spring assembly and a corresponding piston assembly or cylinder assembly;

(3) fixing the compensation clearance, and taking down the fixture to obtain a spring piston unit or a spring cylinder unit with the inner positioning circle and the outer positioning circle coaxial;

(4) and finally, assembling the spring piston unit or the spring cylinder unit with a cylinder assembly or a piston assembly, namely completing the installation.

During specific work, due to the high coaxiality installation of the piston, the leaf spring assembly and the cylinder, the gap between the piston assembly and the cylinder can not be contacted even under a very small condition, so that the sealing of the whole assembly structure can be ensured, and the operation of the assembly structure is not influenced. Where nothing is mentioned in the installation method of the present invention, it is meant to be known at present.

In a preferred embodiment of the present invention, the process of coaxially fixing the leaf spring assembly and the piston assembly or the cylinder assembly by using the fixture in the step (1) is specifically as follows: and (3) taking a clamp with two coaxial clamp positioning circles, and coaxially fixing the two clamp positioning circles with the inner positioning circle and the outer positioning circle respectively, so that the leaf spring assembly and the piston assembly or the air cylinder assembly are coaxially positioned, and the compensation gap is ensured to exist between the leaf spring assembly and the piston assembly or the air cylinder assembly.

In a preferred embodiment of the invention, the clamp and the spring piston unit or the spring cylinder unit are made of materials with different linear expansion coefficients, so that the clamp clamps the spring piston unit or the spring cylinder unit through heating or cooling. Specifically, if the piston and the like are made of aluminum and the like, the clamp can be made of stainless steel or alloy with smaller linear expansion coefficient, such as invar alloy and the like, and vice versa, so that the clamp can be adjusted and installed by adopting a heating or cooling method, the radial fixation of the clamp and the leaf spring assembly and the radial fixation of the cylinder or the piston assembly are completed, and the high coaxiality of the leaf spring assembly and the cylinder or the piston assembly is further maintained.

In a more preferred embodiment of the present invention, the positioning circle of the leaf spring assembly is formed on the inner or outer circumferential surface thereof or other intermediate member fixedly connected to the inner or outer side of the leaf spring assembly according to the structure of the piston assembly, the leaf spring assembly, and the cylinder, etc., which are assembled as needed. Other intermediate pieces can be part of the split cylinder, or a fixed flange assembled with the split cylinder, and the like.

The arrangement mode of the positioning circle and the subsequent fixed installation mode are different according to different structures of the pushing piston cylinder which needs to be assembled.

In a particularly preferred embodiment of the present invention, the piston assembly includes a piston body and a piston rod which are integrally formed, in which case, a piston positioning circle fixed to the jig is formed on an outer circumferential surface of the piston body, and the compensating gap is formed between an end of the piston rod and the leaf spring assembly.

In another specific preferred embodiment of the present invention, the piston assembly comprises a rodless piston body, wherein the outer circumferential surface of the rodless piston body or the inner circumferential surface of the cylinder assembly forms the piston positioning circle or the cylinder positioning circle, and correspondingly, one of the inner side or the outer side of the leaf spring assembly forms the leaf spring positioning circle, and the other side of the leaf spring assembly and the rodless piston body or the cylinder assembly have the compensation gap.

In another specific preferred embodiment of the present invention, the piston assembly comprises a piston body and a piston shaft, and of the two parts of the piston body and the piston shaft, one fixed with the leaf spring assembly has the leaf spring positioning circle, and the other fixed with the piston positioning circle has the compensation clearance with the leaf spring assembly.

In a preferred embodiment of the present invention, the gap-compensating consolidation means is one or a combination of two of adhesive bonding and low thermal stress welding. More preferably, the adhesive is epoxy resin adhesive; the low thermal stress welding adopts laser or electron beam welding. The compensation clearance is fixed by a combination mode of firstly adopting adhesive for bonding and then welding;

In the invention, the piston assembly can be designed into a step-shaped piston structure according to the requirement, and at the moment, the cylinder naturally also makes adaptive adjustment according to the piston assembly structure.

The invention also provides the application of the installation method of the first object or the second object in the assembly of a pulse tube refrigerator or a compressor.

Compared with the prior art, the invention adopts the fixture to assemble the piston and the spring into a pair of spring piston units with high coaxiality, and then assemble the spring piston units with the cylinder, or assemble the cylinder and the flat spring assembly into a pair of spring cylinder units with high coaxiality and then assemble the spring cylinder units with the piston. When the spring piston unit is installed specifically, the leaf spring assembly and the like are provided with positioning circles, the clamp can be made of materials with different linear expansion coefficients of the piston (or the cylinder) and the leaf spring assembly, therefore, when the clamp fixes the piston or the cylinder and the leaf spring assembly, positioning gaps between the clamp and the leaf spring assembly and between the clamp and the piston (or the cylinder) can be eliminated in a heating or cooling mode, and at the moment, the coaxiality of the leaf spring assembly and the piston (or the cylinder) can be realized. In addition, because there is the compensation clearance between leaf spring subassembly and piston or the cylinder, the size of compensation clearance designs into also keeps piston or cylinder and leaf spring subassembly radially contactless when the locating clearance is little or for the burden, then, adopt the adhesive to fill in the compensation clearance and solidification, or adopt welding mode that thermal stress is little such as laser or electron beam fixed, can make piston and leaf spring subassembly (or basic location circle) keep high axiality, the setting up of compensation clearance can guarantee that the leaf spring subassembly can not produce radial effort to piston or cylinder, and then make the piston of the completion of assembling originally, the cylinder etc. deviate from coaxial. Finally, the cylinder or the piston is continuously assembled by using a method similar to a clamp, and the like, so that the piston, the leaf spring assembly and the cylinder can be installed with high coaxiality and form a piston cylinder unit. The assembled piston cylinder unit can be applied to a pulse tube refrigerator or a compressor, the gap between the piston and the cylinder can be effectively reduced under the condition that the piston and the cylinder are not in contact, and the efficiency of the compressor and the refrigerator is ensured.

Drawings

FIG. 1a is a schematic illustration of an inner circle positioning assembly;

FIG. 1b is a schematic view of a leaf spring assembly;

FIG. 1c is a schematic view of a fixture;

FIG. 1d is a schematic view of the assembly of the clamp with the inner positioning circle assembly and the leaf spring assembly;

FIG. 1e is a schematic view of an assembled leaf spring coaxial body;

FIG. 1f is a schematic view of the first piston body;

FIG. 1g is a schematic view of a push piston cylinder block I;

FIG. 1h is an assembly diagram of the coaxial body of the leaf spring, the first pushing piston body and the first pushing piston cylinder body;

FIG. 2a is a schematic view of the structure of the right half of the thrust piston cylinder block;

FIG. 2b is a schematic drawing of the left half of the pushed piston cylinder block;

FIG. 2c is a schematic view of the structure of the pushing piston body;

FIG. 3 is a schematic view of the structure of the clamp;

FIG. 4a is a schematic view of the assembly of the clamp with the pusher piston cylinder block, pusher piston body and leaf spring assembly wherein the compensating gap between the leaf spring assembly and the pusher piston body is consolidated with an adhesive;

FIG. 4b is a schematic view of the assembly of the fixture with the pusher piston cylinder block, the pusher piston body and the leaf spring assembly, wherein the compensation gap between the leaf spring assembly and the pusher piston body is welded and fixed;

FIG. 5a is a schematic view of a spring piston unit with adhesive bonding compensating clearance;

FIG. 5b is a schematic view of a welded, bonded, clearance compensated spring piston unit;

FIG. 6 is a schematic view of the spring piston unit assembled with the left half of the pusher piston cylinder block;

FIG. 7 is an assembled view of the two-stage stepped push piston unit;

FIG. 8a is a schematic view of another alternative push piston cylinder block configuration;

FIG. 8b is a schematic view of the leaf spring assembly mounted inside the pusher piston;

FIG. 8c is a schematic view of a pusher piston shaft;

FIG. 9 is a schematic view of another alternative clamp;

FIG. 10 is a schematic view of the assembly of the clamp with the pusher piston body, pusher piston shaft and leaf spring assembly;

FIG. 11 is a schematic view of FIG. 10 with the clamp removed;

FIG. 12 is a schematic view of FIGS. 11 and 8a assembled with the end cap applied;

FIG. 13a is a schematic view of an assembly of a push piston rod and leaf spring assembly;

FIG. 13b is a schematic view of a push piston shaft;

FIG. 14 is an assembled view of the pushing piston rod, leaf spring assembly and pushing piston shaft;

FIG. 15 is an assembled schematic view of the push piston cylinder block of FIG. 8a and FIG. 14;

FIG. 16a is a schematic view of a pusher piston cylinder block;

fig. 16b is a schematic view of a push piston body;

FIG. 16c is a schematic view of a leaf spring assembly;

FIG. 17 is a schematic view of a fixture;

FIG. 18a is a schematic view of the installation of a clamp and a pusher piston body and leaf spring assembly;

FIG. 18b is a schematic view of the structure of FIG. 18a with the fixture removed;

FIG. 19 is a schematic view of FIG. 18 with the clamp removed and assembled with the pusher piston cylinder block and end cap;

FIG. 20 is an assembled view of the stepped pushing piston similar to FIG. 19;

FIG. 21a is a schematic view of another alternative clamp;

FIG. 21b is a schematic view of the fixture of FIG. 21a mounted with the cylinder block and leaf spring assembly;

FIG. 21c is a schematic view of the high co-axial mounting of the cylinder block and leaf spring assembly of FIG. 21b with the clamp removed;

FIG. 21d is a schematic view of FIG. 21c with the addition of the rodless piston body and end cap;

FIG. 22a is a schematic structural view of the right half of the compressor;

FIG. 22b is a schematic view of the piston body construction;

FIG. 22c is a schematic view of the structure of the cylinder block;

FIG. 23 is a schematic view of a fixture;

FIG. 24a is a schematic view of the assembly of the clamp of FIG. 23 fitted over a piston body and cylinder block;

FIG. 24b is another assembly view of the clamp of FIG. 23 fitted over a piston body and cylinder block;

FIG. 25a is an assembled view of FIG. 24a with a cylinder block and end caps;

FIG. 25b is a schematic view of the assembled compressor of FIG. 25 a;

labeled in FIGS. 1 a-1 h:

24' -inner locating circle component compensation zone, 26 b-inner locating circle, 20d 1-inner locating circle component;

30 ' -leaf spring assembly, 31 ' -leaf spring inner circle one, 32 ' -leaf spring one, 33 ' -leaf spring outer circle one, 3124 ' -compensation clearance;

50 ' -clamp, 51 ' -clamp positioning circle one, 52 ' -clamp positioning circle two;

20d 2-pushing piston body I, 21' -pushing piston outer circle, 26 a-pushing piston inner hole;

10 ' -pushing a piston cylinder body, 11 ' -pushing a piston cylinder I, 15 ' -pushing a piston cylinder mounting circle I;

81 '-pushing the first piston front cavity, 82' -pushing the piston back cavity;

labeled in fig. 2 a-25 b:

10 a-left half of a pushing piston cylinder block, 10 b-right half of a pushing piston cylinder block, 10 c-two of a pushing piston cylinder block, 10 d-three of a pushing piston cylinder block, 10 e-left half of a pushing stepped piston cylinder block, 10 f-four of a pushing piston cylinder block, 11-pushing piston cylinder, 1121-clearance a, 12-pushing piston rod cylinder, 1222-clearance b, 13-pushing piston cylinder installation circle, 14-pushing piston cylinder positioning circle, 1413-clearance c, 1452-clearance d, 15-pushing piston cylinder installation circle, 20-pushing piston body, 20 a-pushing piston body, 20 c-rodless pushing piston body, 20 f-rodless stepped pushing piston body, 21-pushing piston, 2111-clearance e, 2151-gap f, 22-push piston rod, 2212-gap h, 23-push piston compensation zone, 2331-gap i, 2331 a-adhesive bond, 2331 b-weld, 24-internal sealing surface, 25-push piston mounting lug, 2531-gap k, 2531 a-bond, 30-leaf spring assembly, 31-leaf spring inner circle, 3141-gap l, 3141 a-filler, 32-leaf spring, 33-leaf spring outer circle, 3354-gap m, 40-push piston shaft, 41-push piston shaft compensation zone, 4131-gap n, 4131 a-bond, 42-push piston shaft positioning circle, 4213-gap o, 4252-gap p, 4253-gap q, 43-external sealing surface, 4324-clearance seal s, 50 a-clamp I, 50 b-clamp II, 50 c-clamp III, 50 e-clamp IV, 50 f-clamp V, 51-clamp pushing piston positioning circle, 52-clamp pushing piston cylinder positioning circle, 53-clamp pushing piston shaft positioning circle, 54-clamp sheet spring component positioning circle, 55-clamp piston positioning circle, 56-cylinder positioning circle II, 57-clamp pushing piston cylinder positioning circle a, 58-clamp sheet spring component positioning circle a, 60 a-compressor right half, 60 b-cylinder body, 61-motor stator, 62-motor mover, 63-piston through hole compensation area, 64-cylinder positioning circle I, 6456-clearance u, 65-flange and 66-cylinder part, 67-cylinder installation circle, 6764-clearance v, 70-piston body, 71-piston part, 7155-clearance w, 7166-clearance x, 72-piston shaft, 73-piston shaft compensation zone, 7363-compensation clearance y, 7363 a-adhesion zone, 7363 b-welding zone, 81-push piston front chamber, 811-push piston front chamber one, 812-push piston front chamber two, 82-push piston back chamber, 83-push piston air reservoir, 1157-clearance a ', 3158-clearance b ', 3315-clearance c '.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

A method for assembling a leaf spring coaxial body is specifically formed by installing a leaf spring assembly, an outer positioning round assembly and an inner positioning round assembly.

As shown in FIG. 1a, inner positioning circle assembly 20d1 has an inboard positioning circle 26b and an inner positioning circle assembly offset region 24'.

As shown in FIG. 1b, the annular plate spring 32 'is installed on the inner circle 31' and the outer circle 33 'of the plate spring to form the plate spring assembly 30'. The outer circle 33 'of the leaf spring assembly 30' is integrated with the outer positioning circle assembly, the circumferential surface of the outer circle 33 'of the leaf spring assembly is the outer positioning circle, and the inner circle 31' of the leaf spring assembly is used as a compensation area of the leaf spring.

As shown in FIG. 1c, the clamp 50 ' has two highly coaxial clamp positioning circles, clamp positioning circle one 51 ' and clamp positioning circle two 52 '. During installation, the outer positioning circle (i.e., the first outer positioning circle 33 ') and the inner positioning circle (i.e., the second inner positioning circle 26b) are coaxially fixed by the two clamp positioning circles (i.e., the first clamp positioning circle 51' and the second clamp positioning circle 52 ') of the clamp 50', so as to ensure that the gap 51 '33' between the first clamp positioning circle 51 'and the first outer positioning circle 33' of the leaf spring and the gap 52 '26 b between the second clamp positioning circle 52' and the inner positioning circle 26b are both zero or negative, at this time, the compensation region of the inner positioning circle assembly and the compensation region of the leaf spring form a compensation gap 31 '24' with a positive spacing, and then the compensation gap 31 '24' is fixed by an adhesive or a low thermal stress welding method, as shown in fig. 1 d.

Because the first outer positioning circle 33 ' and the inner positioning circle 26b of the leaf spring are clamped by the clamp to maintain high coaxiality, the coaxial body of the leaf spring shown in fig. 1e is obtained after the clamp 50 ' is removed, and the first outer positioning circle 33 ' and the inner positioning circle 26b of the leaf spring can maintain high coaxiality.

The adhesive filled in the compensation gap can generate thermal strain due to different thermal expansion coefficients to influence the coaxiality of the outer positioning circle and the inner positioning circle, but the gap is small and the influence is limited. The welding with small thermal stress such as laser welding or electron beam welding also has thermal stress, but the coaxiality cannot be influenced by excessive stress when the welding is carried out by all welding after the rapid spot welding is carried out for fixation.

Because of the existence of the compensation clearance, the spring is not stressed before the fixed connection, and the coaxiality cannot be influenced by the rebound of the spring after the clamp is loosened.

The consolidation may be by adhesive only, or by welding, or by both. The best mode is to fix the steel plate by using an adhesive and then weld the steel plate, so that the steel plate is stronger. In addition, in order to prevent the volatilization of the adhesive, the adhesive is welded after being fixed and solidified by the adhesive, and the adhesive can be removed after welding, so that the influence of welding stress on the coaxiality is completely eliminated without organic matters.

The fixing mode of the clamp in this embodiment may be: the fixture and the plate spring coaxial body are made of materials with different thermal expansion coefficients, if the fixture is made of aluminum, the plate spring coaxial body is made of stainless steel and the like, at the moment, two fixture positioning circles can be respectively sleeved on the inner positioning circle and the outer positioning circle by utilizing a cooling mode and a size design with higher precision, the fixture positioning circles are sleeved on the inner positioning circle and the outer positioning circle at room temperature, and after cooling, the fixture positioning circles are tightly sleeved on the inner positioning circle and the outer positioning circle, so that coaxial fixed clamping is realized; or the clamp is made of stainless steel, the leaf spring coaxial body is made of aluminum and the like, the sleeve is sleeved at room temperature, and coaxial fixed clamping is realized after heating; or the clamp is made of a material with a large thermal expansion coefficient, such as aluminum-magnesium alloy, the coaxial body of the leaf spring is made of aluminum and the like, and the leaf spring is sleeved at room temperature to reduce the temperature and clamp the leaf spring; or directly clamping by adopting a high-precision clamp.

The clamp may employ a clamping mechanism having two concentric equivalent clamp positioning circles of variable diameter, such as the three-jaw stationary plate of a machine tool, the three jaws of the three-jaw stationary plate may form two equivalent positioning circles, which are equivalent to the clamp positioning circle one 51 'and the clamp positioning circle two 52' of fig. 1 c. Since the diameter of the equivalent positioning circle of the three-jaw can be changed by the tool, it is not necessary to heat or cool the clamp, thereby further improving the mounting accuracy.

When the obtained leaf spring coaxial body is applied to a pushing piston cylinder system, as shown in fig. 1f, a pushing piston inner hole 26a in a pushing piston and a pushing piston outer circle 21 ' can be highly coaxial, and as the pushing piston inner hole 26a and an inner positioning circle 26b of the leaf spring coaxial body are in interference fit or have a slight clearance fit, the pushing piston outer circle 21 ' and a leaf spring outer positioning circle 33 ' can keep high coaxiality. A pushing piston cylinder body 10 ' is arranged on the outer positioning circle 33 ' of the leaf spring, and the structure of the pushing piston cylinder body is shown in fig. 1g, the pushing piston cylinder body 10 ' is provided with a pushing piston cylinder 11 ' and a pushing piston cylinder mounting circle 15 ' which are coaxial, and the clearance 33 ' 15 ' between the pushing piston cylinder mounting circle 15 ' and the outer circle 33 ' of the leaf spring is ensured to be zero or negative by adopting interference fit or weak clearance fit, so that the pushing piston and the pushing piston cylinder can be ensured to have high coaxiality, and the clearance 21 ' 11 ' between the pushing piston and the pushing piston cylinder is enabled to be small. After the end cap is installed, the pushing piston cylinder system shown in fig. 1h can be obtained, wherein 81 'is a first pushing piston front cavity, and 82' is a first pushing piston back cavity.

In fig. 1b, the coaxiality of the outer circle 33 ' of the leaf spring and the inner circle 31 ' of the leaf spring is difficult to ensure, the leaf spring 32 ' is generally fixed by a bolt, and deformation is caused by the action of the bolt, so that even if a clamp is used to ensure that the outer circle 33 ' of the leaf spring and the inner circle 31 ' of the leaf spring keep high axial degree, the clamp is removed and is difficult to deform due to the resilience of the spring, and the coaxiality is difficult to ensure. The installation method of the present embodiment overcomes this drawback. With the leaf spring coaxial body of fig. 1e, various cylinder piston leaf spring systems of high coaxiality can be assembled and small clearances can be used.

The leaf spring has great radial rigidity and moderate axial rigidity, and may be in various shapes, and most commonly, several spiral arms, linear arms, sector arms, etc. are machined on circular steel plate, beryllium bronze, etc. as the material of the spring. Thus, the first outer leaf spring circle 33' and the inner positioning circle 26b of the coaxial body of the leaf spring of FIG. 1e can be regarded as one rigid body in the radial direction and are immovable relative to each other, while the axial direction is flexible and movable relative to each other.

The inner and outer positioning circles of this embodiment may be changed to the outer circle of the piston on the piston assembly or the inner circle of the cylinder on the cylinder assembly, as shown in the following embodiments.

Example 2

A method for mounting a piston, a leaf spring and a cylinder is used for realizing high-coaxiality assembly of a first pushing piston cylinder body, a leaf spring assembly 30 and a pushing piston body 20.

Here, the first sliding piston cylinder block is composed of a right half 10b of the sliding piston cylinder block and a left half 10a of the sliding piston cylinder block as shown in fig. 2a and 2b, respectively. Referring to fig. 2a, the outer surface of the right half 10b of the push piston cylinder block has a push piston cylinder positioning circle 14, and a push piston rod cylinder 12, which maintains a high degree of coaxiality with the push piston cylinder positioning circle 14, is formed in the middle thereof. The high coaxiality of the pushing piston cylinder positioning circle 14 and the pushing piston rod cylinder 12 can be obtained by processing by a conventional technology, such as one-time processing by a lathe or a grinding machine. Referring to fig. 2b, a left half 10a of the sliding piston cylinder block includes a sliding piston cylinder 11 and a sliding piston cylinder mounting circle 13 located inside the sliding piston cylinder 11, and the sliding piston cylinder 11 and the sliding piston cylinder mounting circle 13 maintain high coaxiality, which can be processed by a conventional technique, such as one-time processing by a lathe or a grinding machine.

As shown in fig. 2c, the sliding piston body 20 comprises a sliding piston 21 and a sliding piston rod 22, which are connected in one piece, and a sliding piston compensation area 23 is provided at the free end of the sliding piston rod 22. Here, too, the pusher piston 21 and the pusher piston rod 22 are easy to maintain high coaxiality, and can be processed by a conventional technique such as a lathe or a grinder as described above. For the convenience of processing and installation, the left end part can be processed in a split mode and then assembled into a whole.

Referring to fig. 2a, a leaf spring assembly 30 is mounted on the right half 10b of the pushing piston cylinder block and includes a leaf spring 32 having an annular shape, and a leaf spring inner circle 31 of the leaf spring assembly 30 is a leaf spring assembly compensation area opposite the pushing piston compensation area 23.

In order to achieve the above-mentioned high-coaxiality installation of the pushing piston body 20 and the pushing piston cylinder block, in the present embodiment, a first clamp 50a is used for auxiliary installation, and as shown in fig. 3, the first clamp 50a is cylindrical and has a high-coaxiality clamp pushing piston positioning circle 51 and a clamp pushing piston cylinder block positioning circle 52 inside. The high coaxiality of the clamp pusher piston positioning circle 51 and the clamp pusher piston cylinder block positioning circle 52 is also machinable using conventional techniques. Such as one-time processing by a lathe or a grinding machine.

In the specific installation, as shown in fig. 4a, a right half 10b of the sliding piston cylinder block is assembled with the sliding piston body 20. The pushing piston rod 22 passes through the pushing piston rod cylinder 12, and a pushing piston compensation area 23 on the pushing piston rod 22 corresponds to a leaf spring inner side circle 31 on the leaf spring assembly 30. At this time, the right half part 10b of the push piston cylinder block is assembled and fixed with the push piston body 20 by using the first clamp 50a, the first clamp push piston positioning circle 51 of the first clamp 50a corresponds to the outer surface of the push piston 21 with a gap f 2151 left, and the first clamp push piston cylinder block positioning circle 52 corresponds to the push piston cylinder positioning circle 14 with a gap d 1452 left.

The pushing piston body 20, the right half part 10b of the pushing piston cylinder body and the first clamp 50a are made of materials with different linear expansion coefficients. Such as the thrust piston body 20 and the right half 10b of the thrust piston cylinder block may be aluminum. Clamp one 50a is stainless steel or an alloy with a lower wire expansion coefficient such as invar. Thus, the installation can be carried out by heating or cooling to maintain high coaxiality.

In order to ensure the smooth assembly of the first clamp 50a with the right half 10b of the sliding piston cylinder block and the sliding piston body 20, the gap f 2151 and the gap d 1452 are left with a sufficient width. After heating, clearance f 2151 and clearance d 1452 become small or negative, and by design, the inner circle 31 of the leaf spring and clearance 2331 of compensation area 23 of the pusher piston are still wide enough to ensure that pusher piston rod 22 is not in contact with leaf spring assembly 32 and thus does not interfere with the positioning of the pusher piston. Since the jig pushing piston positioning circle 51 and the jig pushing piston cylinder positioning circle 52 have high coaxiality, the pushing piston 21 and the pushing piston cylinder positioning circle 14 can maintain high coaxiality, and at this time, the gap b 1222 between the pushing piston rod 22 and the pushing piston rod cylinder 12 has a proper width, and the pushing piston rod 22 and the pushing piston rod cylinder 12 maintain high coaxiality due to the jig 50a and do not contact with each other. Gap i 2331 may be filled with an adhesive bond 2331a, such as epoxy, as shown in fig. 4a, after curing, clamp one 50a is removed, pushing piston 21 and pushing piston cylinder positioning circle 14 may maintain high concentricity, pushing piston rod 22 and pushing piston rod cylinder 12 may maintain high concentricity, and pushing piston rod 22 and pushing piston rod cylinder 12 may not contact when gap b 1222 is small.

So far, equivalent to obtaining a leaf spring coaxial body, the leaf spring coaxial body in this embodiment is a piston leaf spring coaxial body, at this time, the pushing piston 21 is an inner positioning circle, the pushing piston cylinder positioning circle 14 is an outer positioning circle, the structure in fig. 2a is a structure after the outer positioning circle assembly and the leaf spring assembly are assembled, and fig. 2c is an inner positioning circle assembly. Because the outer positioning circle (namely the pushing piston cylinder positioning circle 14) and the inner positioning circle (namely the pushing piston 21) are ensured to be coaxial in height through the clamp, before fixation, a gap i 2331 (namely a compensation gap) exists between the structure in fig. 2a and the structure in fig. 2c, therefore, the structure in fig. 2a is not contacted with the structure in fig. 2c, so that after subsequent fixation by adopting glue or welding and other modes, the coaxiality of the outer positioning circle (namely the pushing piston cylinder positioning circle 14) and the inner positioning circle (namely the pushing piston 21) cannot be reduced due to rebound of the leaf spring after the clamp is removed due to stress of the leaf spring assembly.

In addition, the adhesive filled in the compensation gap may generate thermal strain due to different thermal expansion coefficients to influence the coaxiality of the outer positioning circle and the inner positioning circle, but the gap is small and the influence is limited. The welding with small thermal stress such as laser welding or electron beam welding also has thermal stress, but the coaxiality is not influenced or is not influenced by excessive stress when the welding is carried out by all welding after rapid spot welding and fixing.

Since the adhesive with high strength is generally organic, volatile gas is easily generated, and the service life of the refrigerator is influenced. The way of fastening the right half 10b of the push piston body and the push piston body 20 in the gap i 2331 of fig. 4a with the adhesive-filled fastener 2331a can be replaced by the welding method of fig. 4b, which welds the leaf spring inner circle 31 with the push piston compensation area 23 with the fastener 2331b by a welding method with less thermal stress such as laser welding or electron beam, as shown in fig. 4b, so that there is no organic matter. Of course, adhesive plus welding methods may also be used. Or the adhesive is replaced by a low temperature solder.

The above-described assembled structure of the right half portion 10b of the pushing piston body and the pushing piston body 20 after the first jig 5a is fixed and removed is shown in fig. 5a and 5 b.

The right half of the thrust piston body 10b and the thrust piston body 20 assembled in fig. 5a are continuously assembled with the left half of the thrust piston cylinder block 10a, and the resulting structure is shown in fig. 6. The specific assembling process is as follows: heating the left half part 10a of the pushing piston cylinder body and sleeving the pushing piston cylinder positioning circle 14, wherein when the left half part 10a of the pushing piston cylinder body is cooled to normal temperature, a clearance c 1413 between the pushing piston cylinder mounting circle 13 on the left half part 10a of the pushing piston cylinder body and the pushing piston cylinder positioning circle 14 is in interference fit, and a clearance e 2111 is in clearance fit. Since the clearance c 1413 is interference fit, the pushing piston cylinder 11 and the pushing piston cylinder mounting circle 13 are highly coaxial, and thus the pushing piston cylinder 11 and the pushing piston cylinder positioning circle 14 are highly coaxial. The pushing piston 21 and the pushing piston cylinder 11 maintain high coaxiality because the pushing piston 21 and the pushing piston cylinder positioning circle 14 maintain high coaxiality. So that when the clearance e 2111 is small, the push piston cylinder 21 is kept out of contact with the push piston cylinder 11.

The end caps are added to form a pushing piston unit, as shown in fig. 6, a pushing piston front cavity 81, a pushing piston back cavity 82 and a pushing piston air reservoir 83 are formed. The thrust piston body 20 can move back and forth axially in the thrust piston unit, with theoretically slight radial movements, but with great radial stiffness, which can be regarded as rigid.

Example 3

What is different from the embodiment 2 is that the present embodiment is provided with a two-step pushing piston unit, and the structure thereof is shown in fig. 7, and the pushing piston 21 of the pushing piston body 20 in the embodiment 1 is partially changed into a two-step structure, so as to obtain a pushing piston body two 20a, and at the same time, the original left half 10a of the pushing piston cylinder body is also changed into a left half 10e of the pushing piston cylinder body matched with the two-step pushing piston body two 20 a. In this case, the two-stage stepped push piston unit of this embodiment is assembled to have a first push piston front chamber 811 and a second push piston front chamber 812, a back push piston chamber 82, and a push piston reservoir 83.

The two-stage stepped push piston unit in the embodiment can be used for a two-stage pulse tube refrigerator.

Similarly, in a more stepped sliding piston unit, the sliding piston 21 portion of the sliding piston body 20 may be stepped more than once in the above-described manner.

Example 4

The present embodiment provides another highly coaxial assembling method for the pushing piston unit, which includes the pushing piston cylinder block two 10c, the leaf spring assembly 30, the pushing piston body 20 and the pushing piston shaft 40.

Referring to fig. 8a, a pushing piston cylinder mounting circle 13 is provided on one side of the pushing piston cylinder block 10c, and a pushing piston rod cylinder 12 and a pushing piston cylinder 11 are provided in the pushing piston cylinder block 10c in order from one side of the pushing piston cylinder mounting circle 13 to the other side. The pushing piston rod cylinder 12, the pushing piston cylinder 11 and the pushing piston cylinder installation circle 13 keep high coaxiality.

Referring to fig. 8b, the leaf spring assembly 30 in this embodiment is arranged inside the push piston body 20, to be precise, on the inner wall of the portion of the push piston 21 of the push piston body 20. The inner side circle 31 of the inner side portion of the flat spring assembly 30 is the compensation zone of the flat spring assembly.

As shown in fig. 8c, the sliding piston shaft 40 has a sliding piston shaft compensation area 41 and a sliding piston shaft positioning circle 42 on one side.

A second clamp 50b is designed for high coaxial mounting of the four components, and as shown in FIG. 9, the inner wall of the second clamp 50b is provided with a clamp pushing piston positioning circle 51 and a clamp pushing piston shaft positioning circle 53 with high coaxiality.

Similar to embodiment 1, the same material can be used for the pusher piston body 20 and the pusher piston shaft 40, and the second clamp 50b can be another material with a different linear expansion coefficient.

Referring to fig. 10, the push piston body 20 and the push piston shaft 40 are assembled together using a second jig 50 b. At normal temperature, the gap f 2151 and the gap q 4253 have a sufficient width, and are easy to assemble. After heating, the clearance f 2151 and the clearance p 4252 become small or negative, and the clearance n 4131 is still wide enough to keep the pushing piston shaft 40 from contacting the leaf spring assembly 30 and not interfering with the positioning of the pushing piston body 20 and the pushing piston shaft 40. The jig pushing piston positioning circle 51 and the jig pushing piston shaft positioning circle 53 have high coaxiality. Therefore, the advancing piston 21 and the advancing piston shaft positioning circle 42 can maintain a high coaxiality.

The fastener 4131a is formed by laser welding or the like to weld the inner disc 31 of the leaf spring as the compensation area of the leaf spring assembly and the compensation area 41 of the pushing piston shaft together. And cooling to normal temperature, removing the second fixture 50b, and keeping the pushing piston 21 and the pushing piston shaft positioning circle 42 in high coaxiality. The structure with the second jig 50b removed is shown in fig. 11.

The structure obtained in fig. 11 may be referred to as a piston leaf spring coaxial body, and the pushing piston 21 may be regarded as an outer positioning circle, and the pushing piston shaft positioning circle 42 may be regarded as an inner positioning circle.

The pushing piston shaft 40 and the leaf spring assembly 30 may be fixed by adhesive bonding or by adhesive and welding.

Next, the structure shown in fig. 11 is assembled with the second sliding piston cylinder block 10c shown in fig. 8a, and then the end caps are added, so that a sliding piston unit shown in fig. 12 is obtained, and a sliding piston front cavity 81 (between the sliding piston 21 and the end caps), a sliding piston back cavity 82, and a sliding piston reservoir 83 are formed. For convenience of installation, the pushing piston cylinder block 10c is generally heated and then sleeved on the pushing piston shaft 40, and after the temperature is cooled to normal temperature, the gap o 4213 becomes very small or interference fit. Since the pushing piston cylinder 11, the pushing piston rod cylinder 12 and the pushing piston cylinder mounting circle 13 maintain high coaxiality, and the pushing piston 21 and the pushing piston shaft positioning circle 42 maintain high coaxiality, the pushing piston 21 and the pushing piston cylinder 11 can maintain high coaxiality, the pushing piston rod 22 and the pushing piston rod cylinder 12 can maintain high coaxiality, and under the condition that the gap e 2111 and the gap h 2212 can be small, the pushing piston 21 and the pushing piston cylinder 11 can be kept not to be in contact, and the pushing piston rod 22 and the pushing piston cylinder 22 can be kept not to be in contact.

Example 5

In contrast to exemplary embodiment 4, in the present exemplary embodiment, the inner sealing surface 24 of the sliding piston rod 22, as shown in fig. 13a, forms a gap seal s 4324 with the outer sealing surface 43 of the sliding piston shaft 40, as shown in fig. 13b, as shown in fig. 14. At this time, the clearance l 3141 between the compensation area of the leaf spring assembly (i.e., the inner circle 31 of the leaf spring) and the compensation area 41 of the pushing piston shaft is filled with a filler 3141a and is fixed.

The above-mentioned structure of the pushing piston body 20 and the pushing piston shaft 40 is assembled with the pushing piston cylinder block two 10c in fig. 8a, as shown in fig. 15, the diameter of the pushing piston rod 22 is designed to be smaller than the pushing piston rod cylinder 12, and the pushing piston shaft 40 becomes an equivalent pushing piston rod.

Example 6

The present embodiment provides a method of assembling a rodless pusher piston unit that also involves high coaxial installation of the pusher piston cylinder block three 10d, leaf spring assembly 30, rodless pusher piston body 20c, and the like.

As shown in fig. 16a, third sliding piston cylinder block 10d also has sliding piston cylinder 11 and sliding piston cylinder mounting circle 15, which maintain a high degree of coaxiality.

Referring to fig. 16b, the rodless pusher piston body 20c has a pusher piston 21 and a pusher piston mounting lug 25 integrally formed in a high coaxial relationship with the pusher piston 21.

Referring to fig. 16c, the flat spring assembly 30 is ring-shaped, and the outer side wall thereof forms a flat spring outer circle 33 as a flat spring assembly mounting circle, and the inner side wall of the flat spring inner circle 31 is a flat spring assembly compensation area.

First, in order to assemble the rodless pusher piston body 20c shown in fig. 16b with the leaf spring assembly 30 shown in fig. 16c and maintain a high coaxiality of the leaf spring outer circle 33 and the pusher piston 21, the present embodiment is implemented by designing the jig three 50 c.

Referring to FIG. 17, the inner wall of clamp three 50c has a high concentricity clamp push piston positioning circle 51 and a clamp leaf spring assembly positioning circle 54.

Specifically, when the piston is mounted, the clamp three 50c is fitted over the rodless push piston body 20c and the leaf spring assembly 30, the gap f 2151 and the gap m 3354 become minute or negative after heating, and the gap k 2531 still has a certain width, and then the leaf spring assembly 30 and the rodless push piston body 20c are fixed by an adhesive 2531a (or by welding), and after cooling, the assembled structure is as shown in fig. 18 a. With the clamp three 50c removed, as shown in FIG. 18b, the pushing piston 21 can maintain a high degree of concentricity with the leaf spring outer circle 33.

So far, the structure in fig. 18b can be called a piston leaf spring coaxial body, at this time, the pushing piston 21 can be regarded as an inner positioning circle, and the leaf spring outer side circle 33 can be regarded as an outer positioning circle, and after the above assembly, the two parts have achieved high coaxiality, and the piston leaf spring coaxial body is obtained.

Then, on the basis of fig. 18b, after pushing piston cylinder block three 10d is heated and sleeved on leaf spring assembly 30 and then cooled, and the clearance between pushing piston cylinder block three 10d and leaf spring outside circle 33 is small or negative, pushing piston 21 and pushing piston cylinder 11 can keep high coaxiality, so that under the condition that clearance e 2111 is small, pushing piston 21 and pushing piston cylinder 11 can be kept out of contact, and finally an end cover is added, so that the rodless pushing piston unit shown in fig. 19 can be formed.

Example 7

In addition to embodiment 6, the rodless stepped sliding piston unit can be assembled by modifying the sliding piston 21 in the sliding piston body 20 to be a rodless stepped sliding piston body 20f and processing the sliding piston cylinder block three 10d to obtain a stepped sliding piston cylinder block four 10f, as shown in fig. 20, since the rodless stepped sliding piston body 20f and the sliding piston cylinder block four 10f have high coaxiality, the gap a 1121 between the two is small, but the two can still be ensured not to contact each other.

Example 8

The present embodiment provides another method of assembling the rodless pusher piston unit, which also involves high coaxial installation of the pusher piston cylinder block three 10d, leaf spring assembly 30, rodless pusher piston body 20c, etc.

Unlike embodiment 6, this embodiment is assembled with the rodless push piston body 20c after the push piston cylinder block three 10d and the leaf spring assembly 30 are coaxially installed. At this time, the inner circle 31 of the leaf spring assembly 30 serves as a mounting circle of the leaf spring assembly, and the outer circle 33 of the leaf spring assembly serves as a compensation area of the leaf spring assembly (corresponding to the area opposite to the pushing piston cylinder block three 10 d), as shown in fig. 21b and 21c

The jig five 50f is used in a shape similar to the rodless pusher piston body 20c, and a jig pusher piston cylinder block positioning circle a 57 and a jig plate spring assembly positioning circle a 58 are formed on both outer side wall surfaces thereof, as shown in fig. 21 a.

The specific assembly process is as follows:

the five clamp 50f penetrates into the pushing piston cylinder block three 10d and the leaf spring assembly 30, the gap a ' 1157 and the gap b ' 3158 become tiny or negative after heating, the gap c ' 3315 still has a certain width, then the leaf spring assembly 30 and the pushing piston cylinder block three 10d are fixedly connected by means of bonding or welding, and after cooling, the structure shown in fig. 21b is obtained, the five clamp 50f is removed, the pushing piston cylinder 11 can keep high coaxiality with the leaf spring inner circle 31, and the cylinder leaf spring unit shown in fig. 21c, which can also be called as a cylinder leaf spring coaxial body, is obtained, at this time, the leaf spring inner circle 31 can be regarded as an inner positioning circle, the pushing piston cylinder 11 can be regarded as an outer positioning circle, and the two parts are fixed by the clamp and the like to achieve high coaxiality.

Fig. 21c may be referred to as a cylinder leaf spring coaxial body.

Then, the rodless pusher piston body 20c is cooled and then is assembled into the assembled cylinder leaf spring coaxial body of fig. 21c, and after the temperature is returned to room temperature, the clearance between the rodless pusher piston body 20c and the leaf spring inner circle 31 is small or negative, and at this time, the rodless pusher piston body 20c can also maintain high coaxiality with the pusher piston cylinder 11, so that the pusher piston 21 and the pusher piston cylinder 11 can be kept out of contact when the clearance e 2111 is small, and after the end cap is added, the rodless pusher piston unit shown in fig. 21d can be formed.

It can be seen from the combination of examples 6 and 8 that the high coaxiality of the cylinder and the piston can be maintained regardless of the assembly of the spring and the cylinder into the spring cylinder assembly or the assembly of the spring and the piston into the spring piston assembly, so that a slight gap is maintained to reduce the leakage loss.

Example 9

The present embodiment provides a method for high coaxial installation of a motor and a piston body in a compressor, wherein the motor comprises a right half part 60a of the compressor and an air cylinder body 60 b.

Referring to fig. 22a, the compressor right half 60a is comprised of a motor stator 61, a motor mover 62, a leaf spring assembly 30, and a flange 65. The outer end of the leaf spring assembly 30 is fixed on the motor stator 61, the inner end is fixed on the motor rotor 62, the motor rotor 62 can reciprocate along the axial direction, and the radial direction can be regarded as rigid. The motor stator 61 is fixed on a flange 65, a cylinder positioning circle I64 is arranged on the flange 65, a piston through hole is formed in the motor rotor 62, and the inner wall of the through hole is a piston through hole compensation area 63.

Referring to fig. 22b, the piston body 70 includes a piston portion 71, a piston shaft 72 coaxially connected to the piston portion 71, and a piston shaft compensation area 73 formed on an outer surface of the piston shaft 72.

Referring to fig. 22c, the cylinder block 60b has a cylinder portion 66 and a cylinder mounting circle 67, which maintain high concentricity. The cylinder part 66 and the cylinder mounting circle 67 are naturally coaxial.

In order to realize high coaxial installation of the motor and the piston body, the present embodiment adopts a clamp four 50e to perform auxiliary installation, and as shown in fig. 23, the clamp four 50e is provided with a clamp piston positioning circle 55 and a cylinder positioning circle two 56. The jig four 50e may be made of a material having a different linear expansion coefficient from those of the piston body 70 and the compressor right half portion 60 a.

In specific installation, referring to fig. 24a, the clamp four 50e is sleeved on the piston portion 71 and the cylinder positioning circle one 64 correspondingly, and then heated, so that the clearance w 7155 between the piston portion 71 and the clamp piston positioning circle 55 and the clearance u 6456 between the cylinder positioning circle one 64 and the cylinder positioning circle two 56 are basically zero or in interference fit. At this time, the piston portion 71 naturally maintains high coaxiality with the cylinder positioning circle one 64, at this time, sufficient space is provided by designing the compensation gap y 7363 between the piston shaft compensation region 73 and the piston through hole compensation region 63 so that the piston shaft 72 does not contact the motor mover 62, at this time, an adhesive is filled in the compensation gap y 7363, a bonding region 7363a is formed by curing, and after cooling, the piston portion 71 maintains high coaxiality with the cylinder positioning circle one 64.

At this time, after the fixture four 50e is partially removed in fig. 24a, a piston sheet spring coaxial body is formed, at this time, since the motor mover 63 is further fixedly installed at the inner side of the sheet spring assembly 30, the fixing of the compensation gap between the sheet spring assembly 30 and the piston body 70 can be regarded as the fixing of the gap between the piston body 70 and the motor mover 63, the inner positioning circle can be regarded as the piston portion 71, the outer positioning circle can be regarded as the cylinder positioning circle one 64, and the two can naturally realize the height coaxiality after being fixed by the fixture four 50 e.

Referring to fig. 24b, the adhesive curing during the mounting process can be replaced by laser welding, and the connection between the piston shaft 72 and the motor mover 62 is realized by a welding area 7363 b.

The consolidation method can also adopt the adhesive for fixation and then welding, thus completely eliminating the deformation caused by the welding stress. The adhesive can be replaced by soldering with low temperature.

The volatilization of organic matters is a factor influencing the stability of the long-term refrigeration performance. In order to prevent the volatilization of the adhesive from influencing the long-term stability of the refrigerating performance of the refrigerating machine, the adhesive is welded after being cured, and the adhesive is removed after the welding (such as adopting an organic solvent elution mode and the like), so that the influence of the welding stress on the coaxiality is completely eliminated, and no organic matter volatilizes.

Referring to fig. 25a, after the fixture four 50e is removed from the highly coaxially installed motor and piston body, the highly coaxially installed motor and piston body are assembled with the cylinder block 60b and the corresponding end cap to form a compressor with gap sealing. When the cylinder block 60b is installed, the cylinder block 60b is heated and then sleeved on the cylinder positioning circle I64, after cooling, the clearance v 6764 between the cylinder mounting circle 67 and the cylinder positioning circle I64 is in interference fit, and at the moment, the cylinder part 66 and the piston part 71 naturally keep high coaxiality, so that even if the clearance x 7166 between the piston part 71 and the cylinder part 66 is small, the piston part 71 and the cylinder part 66 cannot be in contact with each other, and the work of the piston part 71 and the cylinder part 66 is further influenced.

Similarly, the motor and piston body obtained in fig. 24b are assembled with the cylinder block 60b and the corresponding end cap after removing the clamp four 50e, so as to obtain the compressor shown in fig. 25 b.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications may be made to the embodiments (e.g., variations in the specific structure of the piston or cylinder, etc.) and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The method for assembling the leaf spring coaxial body is characterized in that a leaf spring assembly and one of an outer positioning round assembly with an outer positioning round or an inner positioning round assembly with an inner positioning round are fixed, then the outer positioning round and the inner positioning round are coaxially fixed by a clamp, a compensation gap which is not in contact or is in zero contact is ensured between the leaf spring assembly and the other of the outer positioning round assembly or the inner positioning round assembly, then the compensation gap is fixed, and then the clamp is taken down, so that the leaf spring coaxial body is obtained.

2. The method of assembling a leaf spring coaxial body according to claim 1, wherein the means of fixing the compensation clearance is one or a combination of both of adhesive bonding and welding.

3. A method of assembling a leaf spring coaxial body according to claim 1 or 2, wherein the compensating gap is fixed by a combination of bonding with an adhesive and then welding;

4. The method for assembling the leaf spring coaxial body according to claim 1, wherein the process of coaxially fixing the outer positioning circle and the inner positioning circle by using the jig specifically comprises:

5. The method of assembling a leaf spring coaxial body according to claim 4, wherein the jig is made of a material having a different thermal expansion coefficient from the inner and outer positioning circle members so that the jig can be made to clamp the outer and inner positioning circles by heating or cooling.

6. The method of assembling a leaf spring coaxial body according to claim 1, wherein the outer or inner positioning circle is a cylinder inner circle on a cylinder assembly or a piston outer circle on a piston assembly.

7. A method of installing a piston assembly, leaf spring assembly and cylinder assembly comprising the steps of:

(2) taking one of a leaf spring positioning circle and a piston positioning circle or a cylinder positioning circle as an inner positioning circle and an outer positioning circle, coaxially fixing the inner positioning circle and the outer positioning circle by using a clamp, and ensuring that compensation gaps with the distances larger than 0 exist between leaf spring assemblies and corresponding piston assemblies or cylinder assemblies;

8. The method of claim 7, wherein the fixture in step (2) has two coaxial fixture positioning circles and is made of a material having a different linear expansion coefficient than the spring piston unit or the spring cylinder unit;

the leaf spring positioning circle on the leaf spring assembly is formed on the inner side or outer side circumferential surface of the leaf spring assembly, or an inner positioning circle assembly or an outer positioning circle assembly which is fixedly connected with the inner side or outer side circumferential surface of the leaf spring assembly respectively.

9. The method for assembling a piston assembly, a leaf spring assembly and a cylinder assembly according to claim 7 or 8, wherein the piston assembly comprises a piston body and a piston rod which are integrally processed, a piston positioning circle fixed with a clamp is formed on the outer circumferential surface of the piston body, and the compensating gap is formed between the end of the piston rod and the leaf spring assembly;

or the piston assembly comprises a rodless piston body, at the moment, the outer circumferential surface of the rodless piston body or the inner circumferential surface of the cylinder assembly forms the piston positioning circle or the cylinder positioning circle, correspondingly, one side of the inner side or the outer side of the leaf spring assembly forms the leaf spring positioning circle, and the compensation gap exists between the other side of the leaf spring assembly and the rodless piston body or the cylinder assembly;

or the piston assembly comprises a piston body and a piston shaft, one of the two parts of the piston body and the piston shaft, which is fixed with the leaf spring assembly, is provided with the leaf spring positioning circle, the other part of the two parts of the piston body and the piston shaft is provided with the piston positioning circle, and the compensation clearance exists between the two parts of the piston body and the piston shaft and the leaf spring assembly.

10. A method according to claim 1 or 7, wherein the gripper is replaced by a gripper mechanism having two concentric equivalent gripper positioning circles of variable diameter.