CN109732311B - Gas distribution piston self-centering coaxial assembly device of Stirling refrigerator - Google Patents
Gas distribution piston self-centering coaxial assembly device of Stirling refrigerator Download PDFInfo
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- CN109732311B CN109732311B CN201811631967.4A CN201811631967A CN109732311B CN 109732311 B CN109732311 B CN 109732311B CN 201811631967 A CN201811631967 A CN 201811631967A CN 109732311 B CN109732311 B CN 109732311B
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Abstract
The invention discloses a gas distribution piston self-centering coaxial assembly device of a Stirling refrigerator, which comprises: the mounting base is provided with a first base hole and a second base hole which are arranged oppositely and coaxial; the gas distribution piston base body coaxial mechanism is used for self-centering and coaxial gas distribution piston base bodies; the piston rod coaxial mechanism is used for self-centering and coaxial piston rods; the gas distribution piston base body coaxial mechanism is arranged in the first base hole and applies radial pressure to the gas distribution piston base body so as to realize self-centering coaxiality of the gas distribution piston base body; the piston rod coaxial mechanism is arranged in the second base hole and applies radial pressure to the piston rod to realize self-centering and coaxial of the piston rod. The invention ensures that the gas distribution piston base body and the piston rod have good coaxiality, and eliminates the problem of poor precision caused by machining precision and installation process, thereby ensuring the smoothness of the reciprocating motion of the gas distribution piston and simultaneously ensuring the sealing efficiency and the refrigerating efficiency of the Stirling refrigerator.
Description
Technical Field
The invention relates to the technical field of assembly of Stirling refrigerators, in particular to a gas distribution piston self-centering coaxial assembly device of a Stirling refrigerator.
Background
The free piston Stirling refrigerator is one mechanical gas refrigerator with power piston unit and gas distributing piston unit reciprocating alternately to expand and compress gas inside the cylinder to produce refrigerating capacity. The free piston Stirling refrigerator adopts advanced technologies such as linear motor drive, plate spring support, gap sealing and pure pneumatic expansion machines, has the advantages of high reliability, low vibration, long service life, no maintenance and the like, and has more advantages compared with the Stirling refrigerator of the traditional refrigeration equipment in the field of ultralow temperature refrigeration.
The free piston Stirling refrigerator mainly comprises a refrigerator body, a power piston part, a gas distribution piston part, a linear motor part, a heat exchanger part, a vibration absorber part and the like, wherein the gas distribution piston part is one of three major moving parts of the refrigerator and mainly comprises a gas distribution piston cylinder assembly, a piston rod, a gas distribution piston plate spring and other components. The assembly coaxiality of the distribution piston base body and the piston rod has great influence on the performance of the refrigerator: on one hand, the gas distribution piston component is a driven moving component of the refrigerator, and the moving power source of the gas distribution piston component is a pressure difference formed between a compression cavity and a buffer cavity in the reciprocating motion process of the power piston component to drive the gas distribution piston component to reciprocate, so that the gas distribution piston is easily clamped and stagnated under the condition that the gas distribution piston and a piston rod are improperly assembled, and the refrigerator is not used for refrigerating; on the other hand, clearance seals are formed between the gas distribution piston part and the machine body part and between the gas distribution piston rod and the power piston sealing column in the operation process of the refrigerator, namely the fit clearances between the gas distribution piston and the machine body and between the gas distribution piston rod and the power piston sealing column are very small, so that the coaxiality requirement of the gas distribution piston base body and the piston rod has great influence on the sealing efficiency and needs high precision.
In order to ensure the performance of the refrigerator, the coaxiality requirement of the distribution piston base body and the piston rod is very high, so that the requirement on the machining precision of parts is very high, and the coaxiality precision requirement cannot be met by a common assembling means according to the structures of the distribution piston base body and the piston rod, and the design and the installation of a tool are required to ensure.
Disclosure of Invention
The invention aims to provide a gas distribution piston self-centering coaxial assembly device for a Stirling refrigerator, which ensures good coaxiality of a gas distribution piston base body and a piston rod, and eliminates the problem of poor precision caused by machining precision and an installation process, thereby ensuring the smoothness and smoothness of reciprocating motion of the gas distribution piston and ensuring the sealing efficiency and the refrigerating efficiency of the Stirling refrigerator.
The technical scheme provided by the invention is as follows:
a Stirling refrigerator gas distribution piston self-centering coaxial assembly device comprises:
the mounting base is provided with a first base hole and a second base hole which are arranged oppositely and coaxial;
the gas distribution piston base body coaxial mechanism is used for self-centering and coaxial gas distribution piston base bodies; and
the piston rod coaxial mechanism is used for self-centering and coaxial piston rods;
the gas distribution piston base coaxial mechanism is arranged in the first base hole and applies radial pressure to the gas distribution piston base so as to realize self-centering coaxiality of the gas distribution piston base;
the piston rod coaxial mechanism is arranged in the second base hole and applies radial pressure to the piston rod to realize self-centering and coaxial of the piston rod.
In the technical scheme, radial pressure is applied to the distribution piston base body through the distribution piston base body coaxial mechanism, radial pressure is applied to the piston rod through the piston rod coaxial mechanism, and the coaxiality of the first base hole and the second base hole is utilized, so that good coaxiality of the distribution piston base body and the piston rod is ensured, the problem of poor precision caused by machining precision and installation process is solved, the smoothness and the fluency of reciprocating motion of the distribution piston are ensured, and meanwhile, the sealing efficiency and the refrigerating efficiency of the refrigerating machine are ensured.
Further preferably, the coaxial valve piston base body mechanism comprises a base body inner conical body and a base body outer conical body; the inner conical body of the base body is provided with a base body cavity for accommodating the gas distribution piston base body, and the outer side wall of the inner conical body of the base body is conical; a first basal body through groove is formed in the side wall of the basal body cavity; the outer conical body of the base body is provided with an accommodating cavity for accommodating the inner conical body of the base body, and the inner side wall of the accommodating cavity is matched with the outer side wall of the inner conical body of the base body; a second base body through groove is formed in the side wall of the accommodating cavity; the inner conical body of the base body and the outer conical body of the base body are sequentially accommodated in the first base hole from inside to outside; the base body outer cone can reciprocate along the axial direction of the first base hole.
In the technical scheme, when the outer conical body of the base body moves towards the large-diameter end of the inner conical body of the base body along the axis direction of the first base hole, the outer conical body of the base body can only do linear motion due to the limiting function of the first base hole, so that the inner conical body of the base body bears the radially inward pressure to tightly hold the gas distribution piston base body, and due to the interaction of forces, the outer conical body of the base body can fully expand the first base hole under the radially outward pressure, so that the self-centering coaxiality of the gas distribution piston base body is realized; more preferably, the outer conical body and the inner conical body of the base body are both provided with the base body through grooves, so that the self-centering device is suitable for self-centering of the distribution piston base body with different size tolerance zones, and has the advantages of wide application range, strong practicability, simple and compact structure and easiness in implementation.
Further preferably, the coaxial mechanism of the gas distribution piston base body further comprises an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are respectively arranged at two ends of the first base hole, and the lower cover plate is arranged close to one side of the piston rod; the upper cover plate is provided with a first through hole for sleeving the gas distribution piston base body; the lower cover plate is provided with a second through hole for sleeving the gas distribution piston base body; the first through hole and the second through hole are respectively arranged coaxially with the first base hole; an annular boss protrudes from the periphery of the second through hole towards one side of the upper cover plate on the surface of one side, close to the upper cover plate, of the lower cover plate; the outer diameter of the annular boss is smaller than that of the gas distribution piston base body; the inner conical body of the base body is sleeved on the outer side of the annular boss, and two ends of the inner conical body of the base body are respectively abutted against the upper cover plate and the lower cover plate.
In the technical scheme, the upper cover plate and the lower cover plate are mutually pressed and assembled, so that the displacement phenomenon of the conical body in the base body is effectively avoided, the coaxiality of the base body cavity, the accommodating cavity and the first base hole is ensured, and the self-centering precision of the gas distribution piston base body is further ensured; more preferably, the annular boss realizes the axial limit of the distribution piston base body, avoids the axial displacement phenomenon of the distribution piston base body, and ensures the self-centering precision requirement of the distribution piston base body.
Further preferably, the base outer cone is mounted on the mounting base through two pairs of oppositely arranged first connecting pieces; the first connecting piece is in threaded connection with the mounting base.
In the technical scheme, the reciprocating motion of the outer conical body of the base body is realized in a screw connection mode, and the device is simple and compact in structure, easy to realize and low in cost. More preferably, the two pairs of first connecting pieces which are arranged oppositely ensure the uniformity and the balance of the outer conical body of the base body to compress the inner conical body of the base body, ensure the coaxiality of the distribution piston base body and the first base hole, and further ensure the self-centering precision of the distribution piston base body.
Further preferably, the taper angle of the outer side wall of the base inner cone is 0-50 °.
Among this technical scheme, the little cone angle setting of the lateral wall of base member internal cone has reduced the outer cone reciprocating motion's of base member the degree of difficulty to reduce labour output, reduce staff's the operation degree of difficulty.
Further preferably, the piston rod coaxial mechanism comprises a piston rod inner cone and a piston rod outer cone; the piston rod inner conical body is provided with a piston rod cavity for accommodating the piston rod, and the outer side wall of the piston rod inner conical body is conical; a first piston rod through groove is formed in the side wall of the piston rod cavity; the piston rod outer conical body is provided with an accommodating cavity for accommodating the piston rod inner conical body, and the inner side wall of the accommodating cavity is matched with the outer side wall of the piston rod inner conical body; a second piston rod through groove is formed in the side wall of the accommodating cavity; the piston rod inner conical body and the piston rod outer conical body are sequentially accommodated in the second base hole from inside to outside; the piston rod outer cone can reciprocate along the axis direction of the second base hole.
In the technical scheme, when the outer conical body of the piston rod moves towards the large-diameter end of the inner conical body of the piston rod along the axis direction of the second base hole, the outer conical body of the piston rod can only do linear motion due to the limiting function of the second base hole, so that the inner conical body of the piston rod can hold the piston rod tightly under the radial inward pressure, and the outer conical body of the piston rod can expand the second base hole under the radial outward pressure due to the interaction of forces, so that the self-centering coaxiality of the piston rod is realized; more preferably, the piston rod through grooves are formed in the piston rod outer conical body and the piston rod inner conical body, so that the self-centering mechanism is suitable for self-centering of the piston rods in tolerance zones with different sizes, and is wide in application range, strong in practicability, simple and compact in structure and easy to achieve.
Further preferably, the piston rod coaxial mechanism further comprises a top cover plate and a bottom cover plate; the top cover plate and the bottom cover plate are respectively arranged at two ends of the second base hole, and the top cover plate is arranged close to one side of the gas distribution piston base body; the top cover plate is provided with a third through hole for sleeving the piston rod; the bottom cover plate is provided with a fourth through hole for sleeving the piston rod; the third through hole and the fourth through hole are respectively arranged coaxially with the second base hole; and two ends of the conical body in the piston rod are respectively abutted to the top cover plate and the bottom cover plate.
In the technical scheme, the top cover plate and the bottom cover plate are mutually compressed and assembled, so that the displacement phenomenon of the conical body in the piston rod is effectively avoided, the coaxiality of the piston rod cavity and the second base hole is ensured, and the self-centering precision of the piston rod is further ensured.
Further preferably, the piston rod outer cone is mounted on the mounting base through two pairs of oppositely arranged second connecting pieces; the second connecting piece is in threaded connection with the mounting base.
In the technical scheme, the reciprocating motion of the outer conical body of the piston rod is realized in a screwing mode, and the device is simple and compact in structure, easy to realize and low in cost. More preferably, the two pairs of oppositely arranged second connecting pieces ensure the uniformity and the balance of the compression of the outer conical body of the piston rod on the inner conical body of the piston rod, ensure the coaxiality of the piston rod and the second base hole and further ensure the self-centering precision of the piston rod.
Further preferably, the taper angle of the outer side wall of the piston rod inner cone is 0-50 °.
In the technical scheme, the small taper angle of the outer side wall of the inner conical body of the piston rod is arranged, so that the difficulty of reciprocating motion of the outer conical body of the piston rod is reduced, labor output is reduced, and the operation difficulty of workers is reduced.
Further preferably, the mounting base is of a U-shaped structure and comprises a first mounting base and a second mounting base which are arranged oppositely, and a connecting plate which is respectively connected with the first mounting base and the second mounting base; the first mounting seat, the second mounting seat and the connecting plate are integrally formed; the first mounting seat is provided with the first base hole; the second mounting seat is provided with the second base hole.
Among this technical scheme, the mounting base is U type and integrated into one piece for first base hole and second base hole can be processed along the pore-forming instrument on the same axis, have guaranteed the high axiality in first base hole and second base hole, have also guaranteed whole mounting base's overall structure performance simultaneously.
The gas distribution piston self-centering coaxial assembly device for the Stirling refrigerator provided by the invention can bring at least one of the following beneficial effects:
1. according to the invention, radial pressure is applied to the gas distribution piston base body through the gas distribution piston base body coaxial mechanism, radial pressure is applied to the piston rod through the piston rod coaxial mechanism, and the coaxiality of the first base hole and the second base hole is utilized, so that good coaxiality of the gas distribution piston base body and the piston rod is ensured, the problem of poor precision caused by machining precision and installation process is solved, the smoothness and smoothness of reciprocating motion of the gas distribution piston are ensured, and meanwhile, the sealing efficiency and the refrigerating efficiency of the Stirling refrigerator are ensured.
2. In the invention, the self-centering of the distribution piston base body and the piston rod is respectively realized through the interaction of the inner conical body and the outer conical body which are connected by the conical surfaces, and the self-centering is more excellent.
Drawings
The above features, technical characteristics, advantages and modes of realisation of the stirling cooler displacer self-centering coaxial fitting device will be further described in a clearly understandable manner with reference to the accompanying drawings, which illustrate a preferred embodiment.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic structural view of one embodiment of the coaxial mechanism of the valve piston base of the present invention;
FIG. 4 is a schematic view showing the structure of a fit between an inner base cone and an outer base cone according to the present invention;
FIG. 5 is a schematic structural diagram of one embodiment of the coaxial piston rod mechanism of the present invention;
fig. 6 is a schematic structural diagram of an embodiment of the mounting base of the present invention.
The reference numbers indicate:
1-distributing piston base; 2-a gas distribution piston base coaxial mechanism; 201-upper cover plate; 202-lower cover plate; 2021-annular boss; 203-internal taper of matrix; 2031 — a first substrate through slot; 204-base outer cone; 2041-a second base through slot; 205-a first connector; 3-a piston rod coaxial mechanism; 301-bottom cover plate; 302-top cover plate; 303-piston rod inner cone; 3031-first piston rod through groove; 304-piston rod outer cone; 305-a second connector; 4-mounting a base; 41-a first mount; 411 — first base hole; 42-a second mount; 421-second base hole; 43-a connecting plate; 5-piston rod.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one". In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In one embodiment, as shown in fig. 1-6, a stirling cooler displacer self-centering coaxial mount apparatus comprises: the installation base 4 is provided with a first base hole 411 and a second base hole 421 which are arranged oppositely and are coaxial; a gas distribution piston matrix coaxial mechanism 2 for self-centering and coaxial gas distribution piston matrix 1; and a piston rod coaxial mechanism 3 for self-centering and coaxial piston rod 5; the gas distribution piston matrix coaxial mechanism 2 is arranged in the first base hole 411 and applies radial pressure to the gas distribution piston matrix 1 to realize self-centering coaxiality of the gas distribution piston matrix 1; the piston rod coaxiality mechanism 3 is installed in the second base hole 421 and applies radial pressure to the piston rod 5 to realize self-centering coaxiality of the piston rod 5. In practical application, the coaxiality of the first base hole 411 and the second base hole 421 is utilized to perform centering coaxial assembly on the gas distribution piston base body 1 and the piston rod 5 in a primary connection state, in the assembly process, radial pressure is applied to the gas distribution piston base body 1 through the gas distribution piston base body coaxial mechanism 2 to enable the gas distribution piston base body 1 to be coaxial with the first base hole 411, radial pressure is applied to the piston rod 5 through the piston rod coaxial mechanism 3 to enable the piston rod 5 to be coaxial with the second base hole 421, so that good coaxiality of the gas distribution piston base body 1 and the piston rod 5 is ensured, and then the gas distribution piston base body 1 and the piston rod 5 in a connection state are fastened and connected, so that the problem of poor precision caused by machining precision and an installation process is solved, smoothness and smoothness of reciprocating motion of the gas distribution piston are ensured, and meanwhile, the sealing efficiency of the Stirling refrigerator is ensured, The refrigeration efficiency. It should be noted that the valve piston base 1 and the piston rod 5 may be fixed in place in one step by centering them and then directly fastening them.
In the second embodiment, as shown in fig. 1-6, on the basis of the first embodiment, the displacer base coaxial mechanism 2 comprises a base inner conical body 203 and a base outer conical body 204; the inner conical body 203 of the base body is provided with a base body cavity for accommodating the gas distribution piston base body 1, and the outer side wall of the inner conical body 203 of the base body is conical; a first substrate through groove 2031 is formed in the side wall of the substrate cavity; the outer conical body 204 of the base body is provided with an accommodating cavity for accommodating the inner conical body 203 of the base body, and the inner side wall of the accommodating cavity is matched with the outer side wall of the inner conical body 203 of the base body; a second substrate through groove 2041 is formed in the side wall of the accommodating cavity; the inner base cone 203 and the outer base cone 204 are sequentially accommodated in the first base hole 411 from inside to outside; the base outer cone 204 is reciprocally movable in the axial direction of the first base hole 411. Preferably, the first substrate through groove 2031 extends along a generatrix of the substrate inner cone 203 and penetrates both ends of the substrate inner cone 203; the second substrate through groove 2041 extends along a generatrix of the substrate outer cone 204 and penetrates both ends of the substrate outer cone 204. Of course, in practical applications, the first substrate through groove 2031 may extend through only one end of the substrate internal cone 203, preferably through the small diameter end of the substrate internal cone 203 (the end with smaller outer diameter of the substrate internal cone 203); similarly, the second substrate through groove 2041 may extend through only one end of the substrate outer cone 204, and preferably extends through the small diameter end of the substrate outer cone 204 (the end of the substrate outer cone 204 with the smaller inner diameter). The outer side wall of the base inner cone 203 fits the inner side wall of the base outer cone 204, i.e. the cone angle of the base inner cone 203 and the base outer cone 204 is equal. It should be noted that the dimension of the first through groove 2031 in the circumferential direction of the inner base cone 203 and the dimension of the second through groove 2041 in the circumferential direction of the outer base cone 204 may be the same or different, and specifically may be set according to the tolerance band of the displacer base 1, and may be set to be suitable for the displacer base 1 with one or more tolerance bands, so as to meet different customer requirements.
When the outer base cone 204 moves towards the large-diameter end of the inner base cone 203 (the end with the larger outer diameter of the inner base cone 203) along the axial direction of the first base hole 411, due to the limiting function of the first base hole 411, the outer base cone 204 can only do linear motion, so that the inner base cone 203 bears the radially inward pressure to tightly hold the air distribution piston base 1 (at this time, the size of the through groove 2031 of the first base along the circumferential direction of the inner base cone 203 is gradually reduced along with the movement of the outer base cone 204, so that the inner base cone 203 tightly holds the air distribution piston base), and due to the interaction of forces, the outer base cone 204 can be expanded into the first base hole 411 by the radially outward pressure, so that the self-centering coaxiality of the air distribution piston base 1 is realized; when the base outer cone 204 moves toward the small-diameter end of the base inner cone 203 (the end of the base inner cone 203 having a smaller outer diameter) in the axial direction of the first base hole 411, the base inner cone 203 releases the displacer base 1 due to the gradual decrease in pressure between the base outer cone 204 and the base inner cone 203; at the same time, the outer cone 204 fits the inner sidewall of the first base hole 411 but the expansion degree is reduced, and at this time, the self-centering displacer base 1 can be taken out or put in the displacer base 1 that needs self-centering.
In the third embodiment, as shown in fig. 1 to 6, on the basis of the second embodiment, the displacer base coaxial mechanism 2 further includes an upper cover plate 201 and a lower cover plate 202; the upper cover plate 201 and the lower cover plate 202 are respectively arranged at two ends of the first base hole 411, and the lower cover plate 202 is arranged at one side close to the piston rod 5; the upper cover plate 201 is provided with a first through hole for sleeving the gas distribution piston base body 1; the lower cover plate 202 is provided with a second through hole for sleeving the gas distribution piston base body 1; the first through hole and the second through hole are respectively arranged coaxially with the first base hole 411; an annular boss 2021 is protruded from the surface of the lower cover plate 202 close to one side of the upper cover plate 201 on the periphery of the second through hole toward one side of the upper cover plate 201; the outer diameter of the annular boss 2021 is smaller than that of the gas distribution piston base body 1; the inner conical body 203 of the base body is sleeved outside the annular boss 2021, and two ends of the inner conical body 203 of the base body are respectively abutted against the upper cover plate 201 and the lower cover plate 202. When the valve piston base body 1 is centered coaxially, the end part of the valve piston base body 1 close to one side of the lower cover plate 202 is supported on the end face of the annular boss 2021 close to one side of the upper cover plate 201. Preferably, the base outer cone 204 is mounted to the mounting base 4 by two pairs of oppositely disposed first connectors 205; the first connector 205 is screwed with the mounting base 4. In practical applications, the first connector 205 is preferably detachably connected to the outer cone 204, such as by screwing, male-female fitting, or snap-fitting. The first connecting element 205 may also be connected to the mounting base 4 by other detachable connection methods, such as by a nut cooperating with the first connecting element 205, or by a fastener fastening and limiting the first connecting element 205. Preferably, the taper angle of the outer sidewall of the base inner cone 203 is 0-50 °.
In the fourth embodiment, as shown in fig. 1 to 6, on the basis of the first, second or third embodiments, the piston rod coaxial mechanism 3 includes a piston rod inner cone 303 and a piston rod outer cone 304; the piston rod inner conical body 303 is provided with a piston rod cavity for accommodating the piston rod 5, and the outer side wall of the piston rod inner conical body 303 is conical; a first piston rod through groove 3031 is formed in the side wall of the piston rod cavity; the piston rod outer conical body 304 is provided with an accommodating cavity for accommodating the piston rod inner conical body 303, and the inner side wall of the accommodating cavity is matched with the outer side wall of the piston rod inner conical body 303; a second piston rod through groove is formed in the side wall of the accommodating cavity; the piston rod inner conical body 303 and the piston rod outer conical body 304 are sequentially accommodated in the second base hole 421 from inside to outside; the piston rod outer cone 304 is reciprocally movable in the axial direction of the second base hole 421. Preferably, the first piston rod through slot 3031 extends along a generatrix of the piston rod inner cone 303 and penetrates through two ends of the piston rod inner cone 303; a second piston rod through slot extends along a generatrix of piston rod outer cone 304 and through both ends of piston rod outer cone 304. Of course, in practical applications, the first piston rod through groove 3031 may also penetrate only one end of the piston rod inner cone 303, and preferably penetrates a small diameter end of the piston rod inner cone 303 (the end of the piston rod inner cone 303 with a smaller outer diameter); likewise, the second piston rod through slot may extend through only one end of piston rod outer cone 304, preferably through the smaller diameter end of piston rod outer cone 304 (the end of piston rod outer cone 304 having the smaller inner diameter dimension). The outer side wall of the piston rod inner cone 303 fits the inner side wall of the piston rod outer cone 304, i.e. the taper angles of the piston rod inner cone 303 and the piston rod outer cone 304 are equal. It should be noted that the size of the first piston rod through groove 3031 in the circumferential direction of the piston rod inner cone 303 and the size of the second piston rod through groove in the circumferential direction of the piston rod outer cone 304 may be the same or different, and specifically may be set according to an error band of the piston rod 5, and may be set to be suitable for a piston rod 5 with one or more error bands, so as to meet different customer requirements. The piston rod 5 and the displacer base 1 are self-centering, respectively, so that the number of error bands provided on the piston rod 5 and the displacer base 1 can be the same or different.
When the piston rod outer conical body 304 moves towards the large-diameter end of the piston rod inner conical body 303 (the end with the larger outer diameter of the piston rod inner conical body 303) along the axis direction of the second base hole 421, due to the limiting function of the second base hole 421, the piston rod outer conical body 304 can only do linear motion, so that the piston rod inner conical body 303 bears the radially inward pressure to tightly hold the piston rod 5 (at the moment, the size of the first piston rod through groove 3031 along the circumferential direction of the piston rod inner conical body 303 is gradually reduced along with the movement of the piston rod outer conical body 304, so that the piston rod inner conical body 303 tightly holds the piston rod 5), and due to the interaction of the forces, the piston rod outer conical body 304 can be expanded to the second base hole 421 by the radially outward pressure, so that the self-centering coaxiality of the piston rod 5 is realized; when the piston rod outer cone 304 moves toward the small diameter end of the piston rod inner cone 303 (the end where the outer diameter size of the piston rod inner cone 303 is small) in the axial direction of the second base hole 421, the piston rod inner cone 303 releases the piston rod 5 due to the gradual decrease in the pressure between the piston rod outer cone 304 and the piston rod inner cone 303; meanwhile, the piston rod outer cone 304 fits the inner side wall of the second base hole 421, but the expansion degree is reduced, and at this time, the piston rod 5 which is self-centering is taken out or the piston rod 5 which needs self-centering is put in.
In the fifth embodiment, as shown in fig. 1 to 6, on the basis of the fourth embodiment, the piston rod coaxial mechanism 3 further includes a top cover plate 302 and a bottom cover plate 301; the top cover plate 302 and the bottom cover plate 301 are respectively arranged at two ends of the second base hole 421, and the top cover plate 302 is arranged close to one side of the gas distribution piston base body 1; the top cover plate 302 is provided with a third through hole for sleeving the piston rod 5; the bottom cover plate 301 is provided with a fourth through hole for sleeving the piston rod 5; the third through hole and the fourth through hole are coaxially arranged with the second base hole 421 respectively; two ends of the piston rod inner cone 303 are respectively abutted against the top cover plate 302 and the bottom cover plate 301. Preferably, the piston rod outer cone 304 is mounted to the mounting base 4 by two pairs of oppositely disposed second connectors 305; the second connector 305 is screwed with the mounting base 4. In practical applications, the second connector 305 is preferably detachably connected to the piston rod outer cone 304, such as by screwing, male-female fitting or snap-fitting. The second connector 305 can also be connected to the mounting base 4 by other detachable connection methods, such as by a nut cooperating with the second connector 305, or by a fastener fastening and limiting the second connector 305. Preferably, the taper angle of the outer side wall of the piston rod inner cone 303 is 0-50 °. In practical applications, the taper angle of the outer sidewall of the piston rod inner cone 303 and the taper angle of the outer sidewall of the base inner cone 203 may be the same or different, but the taper angle of the outer sidewall of the piston rod inner cone 303 and the taper angle of the outer sidewall of the base inner cone 203 are preferably the same, and the large diameter end of the piston rod inner cone 303 and the large diameter end of the base inner cone 203 are preferably disposed on the same side, i.e., the large diameter end of the piston rod inner cone 303 and the small diameter end of the base inner cone 203 are disposed adjacent to each other.
In the sixth embodiment, as shown in fig. 1 to 6, on the basis of the first, second, third, fourth or fifth embodiments, the mounting base 4 is of a U-shaped structure, and includes a first mounting seat 41 and a second mounting seat 42 which are oppositely arranged, and a connecting plate 43 which is respectively connected with the first mounting seat 41 and the second mounting seat 42; the first mounting seat 41, the second mounting seat 42 and the connecting plate 43 are integrally formed; the first mounting seat 41 is provided with a first base hole 411; the second mount 42 is provided with a second base hole 421. Since the mounting base 4 has a U-shaped structure, in order to avoid interference problems caused by a worker when the actuating base outer cone 204 or the piston rod outer cone 304 reciprocates, a portion of the first connecting member 205 for pushing is disposed away from the second mounting base 42, that is, the first connecting member 205 is preferably disposed close to the upper cover plate 201; likewise, the location of the second connecting member 305 for pushing is located away from the first mounting seat 41, i.e., the second connecting member 305 is preferably located close to the bottom cover plate 301. In practical applications, since the upper cover plate 201 is mounted on the surface of the first mounting seat 41 on the side away from the second mounting seat 42, and the lower cover plate 202 is mounted on the surface of the first mounting seat 41 on the side close to the second mounting seat 42, the first connecting member 205 can penetrate through the upper cover plate 201 and then be screwed with the first mounting seat 41. Similarly, the bottom cover plate 301 is mounted on the surface of the second mounting seat 42 on the side away from the first mounting seat 41, and the bottom cover plate 301 is mounted on the surface of the second mounting seat 42 on the side close to the first mounting seat 41, so that the second connecting member 305 can penetrate through the bottom cover plate 301 and then be screwed with the second mounting seat 42. Preferably, the bottom, upper cover plate 201, lower cover plate 202, top cover plate 302 and bottom cover plate 301 are detachably connected to the mounting base 4, such as screw, concave-convex fit or snap.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A stirling cooler distribution piston self-centering coaxial assembly device, comprising:
the mounting base is provided with a first base hole and a second base hole which are arranged oppositely and coaxial;
the gas distribution piston base body coaxial mechanism is used for self-centering and coaxial gas distribution piston base bodies; the piston rod coaxial mechanism is used for self-centering and coaxial piston rods;
the gas distribution piston base coaxial mechanism is arranged in the first base hole and applies radial pressure to the gas distribution piston base so as to realize self-centering coaxiality of the gas distribution piston base;
the piston rod coaxial mechanism is arranged in the second base hole and applies radial pressure to the piston rod to realize self-centering and coaxial of the piston rod;
the gas distribution piston substrate coaxial mechanism comprises a substrate inner conical body and a substrate outer conical body;
the inner conical body of the base body is provided with a base body cavity for accommodating the gas distribution piston base body, and the outer side wall of the inner conical body of the base body is conical; a first basal body through groove is formed in the side wall of the basal body cavity;
the outer conical body of the base body is provided with an accommodating cavity for accommodating the inner conical body of the base body, and the inner side wall of the accommodating cavity is matched with the outer side wall of the inner conical body of the base body; a second base body through groove is formed in the side wall of the accommodating cavity;
the substrate inner conical body and the substrate outer conical body are sequentially accommodated in the first base hole from inside to outside; the base outer conical body can reciprocate along the axial direction of the first base hole;
the piston rod coaxial mechanism comprises a piston rod inner conical body and a piston rod outer conical body;
the piston rod inner conical body is provided with a piston rod cavity for accommodating the piston rod, and the outer side wall of the piston rod inner conical body is conical; a first piston rod through groove is formed in the side wall of the piston rod cavity;
the piston rod outer conical body is provided with an accommodating cavity for accommodating the piston rod inner conical body, and the inner side wall of the accommodating cavity is matched with the outer side wall of the piston rod inner conical body; a second piston rod through groove is formed in the side wall of the accommodating cavity;
the piston rod inner conical body and the piston rod outer conical body are sequentially accommodated in the second base hole from inside to outside; the piston rod outer cone can reciprocate along the axis direction of the second base hole.
2. A stirling cooler displacer self-centering coaxial fitting apparatus according to claim 1, wherein:
the gas distribution piston base coaxial mechanism also comprises an upper cover plate and a lower cover plate;
the upper cover plate and the lower cover plate are respectively arranged at two ends of the first base hole, and the lower cover plate is arranged close to one side of the piston rod;
the upper cover plate is provided with a first through hole for sleeving the gas distribution piston base body;
the lower cover plate is provided with a second through hole for sleeving the gas distribution piston base body;
the first through hole and the second through hole are respectively arranged coaxially with the first base hole;
an annular boss protrudes from the periphery of the second through hole towards one side of the upper cover plate on the surface of one side, close to the upper cover plate, of the lower cover plate;
the outer diameter of the annular boss is smaller than that of the gas distribution piston base body;
the inner conical body of the base body is sleeved outside the annular boss, and two ends of the inner conical body of the base body are respectively abutted to the upper cover plate and the lower cover plate.
3. A stirling cooler displacer self-centering coaxial mount according to claim 1, wherein:
the base outer conical body is arranged on the mounting base through two pairs of first connecting pieces which are oppositely arranged;
the first connecting piece is in threaded connection with the mounting base.
4. A stirling cooler displacer self-centering coaxial mount according to claim 1, wherein:
the taper angle of the outer side wall of the conical body in the base body is 0-50 degrees.
5. A Stirling refrigerator displacer self-centering coaxial mount according to any one of claims 1 to 4, wherein:
the piston rod coaxial mechanism further comprises a top cover plate and a bottom cover plate;
the top cover plate and the bottom cover plate are respectively arranged at two ends of the second base hole, and the top cover plate is arranged close to one side of the gas distribution piston base body;
the top cover plate is provided with a third through hole for sleeving the piston rod;
the bottom cover plate is provided with a fourth through hole for sleeving the piston rod;
the third through hole and the fourth through hole are respectively arranged coaxially with the second base hole;
and two ends of the conical body in the piston rod are respectively abutted to the top cover plate and the bottom cover plate.
6. A Stirling refrigerator displacer self-centering coaxial fitting apparatus according to claim 5, wherein:
the piston rod outer conical body is arranged on the mounting base through two pairs of second connecting pieces which are oppositely arranged;
the second connecting piece is in threaded connection with the mounting base.
7. A Stirling refrigerator displacer self-centering coaxial mount according to claim 5, wherein:
the taper angle of the outer side wall of the inner conical body of the piston rod is 0-50 degrees.
8. A stirling cooler displacer self-centering coaxial mount according to any one of claims 1 to 4 or 6 to 7, wherein:
the mounting base is of a U-shaped structure and comprises a first mounting seat and a second mounting seat which are oppositely arranged, and a connecting plate which is respectively connected with the first mounting seat and the second mounting seat;
the first mounting seat, the second mounting seat and the connecting plate are integrally formed;
the first mounting seat is provided with the first base hole;
the second mounting seat is provided with the second base hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811631967.4A CN109732311B (en) | 2018-12-29 | 2018-12-29 | Gas distribution piston self-centering coaxial assembly device of Stirling refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811631967.4A CN109732311B (en) | 2018-12-29 | 2018-12-29 | Gas distribution piston self-centering coaxial assembly device of Stirling refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109732311A CN109732311A (en) | 2019-05-10 |
| CN109732311B true CN109732311B (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811631967.4A Active CN109732311B (en) | 2018-12-29 | 2018-12-29 | Gas distribution piston self-centering coaxial assembly device of Stirling refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113084488B (en) * | 2021-03-02 | 2022-06-03 | 北京卫星制造厂有限公司 | Assembling method of low-noise water supply pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102463460A (en) * | 2010-11-08 | 2012-05-23 | 中国第一汽车集团公司 | Mounting correction sleeve |
| DE102013001675B4 (en) * | 2013-01-10 | 2015-02-19 | Martin Trenkle | Device for mounting and dismounting hydraulic cylinders |
| CN105563082B (en) * | 2016-02-03 | 2017-08-29 | 吉林大学 | Equipment for the automatic assembling of piston rod in manual pump |
| CN108555560A (en) * | 2018-05-07 | 2018-09-21 | 焦作欣扬程煤矿设备有限公司 | Piston rod assembly machine |
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| CN109732311A (en) | 2019-05-10 |
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