TW201314042A - Rod or connecting rod for linear compressor - Google Patents

Abstract

The present invention relates to a rod (connecting rod) for interconnecting the piston to the end of the resilient member of linear compressors preferably operating at high frequency, comprised of an elongated rod (3) having at least two regions (4) with an increased cross section and at least one medial region (5) of reduced cross section, such elongated rod (3) having a great axial rigidity, high buckling resistance and low cross rigidity in a single and unbroken part.

Description

Rod or connecting rod for linear compressor

The present invention relates to a rod (connecting rod) for interconnecting a piston to a cylinder end of a linear compressor, the rod being designed and developed to provide high axial rigidity, high buckling resistance and low lateral rigidity, thus resulting in more specific It is said to operate a relatively flexible part (piece) in a high frequency linear compressor.

As is well known in the art, in a linear compressor, the reciprocating piston movement is directly related to the resonant movement of the mechanism, and its operation requires the use of a connecting rod in the form of a rod connecting the piston to the resonant component of the compressor, such connections The rod is generally straight, rigid and has a uniform cross section.

However, the characteristics of the connecting rod used impact at least two operationally important conditions of the compressor: the life of the compressor and the noise generated by the operation of the equipment. In this sense, it should be noted that the forces from the reciprocating motion of the rod and the resonance of the spring used are axial and lateral, and the forces contribute to the self-inclusion of the piston and the side wall of the cylinder. The impact/friction between the two produces noise, which can also cause fatigue failure of the connecting rod or accelerate piston wear, because the greater the lateral force transmitted from the connecting rod to the piston, the more friction between the piston and the cylinder Large, and the wear rate of the piston is greater.

By considering these operating conditions, some technical solutions have been developed to overcome the problems mentioned, for example, in the documents shown in the document P10500338-BR 5, which discloses the use of side-by-side configurations by the geometric axes along the drive rods. A plurality of longitudinal rods of thin cross-section form a connecting rod that provides set lateral flexibility and axial rigidity. However, this solution involves significantly improving the device One of the final costs of complex structures and assembly procedures. Since the document JP61274171 provides a flexible connecting rod made of synthetic resin, although it can absorb part of the working stress, the connecting rod can provide lower axial rigidity than the suitable axial rigidity for operation in a high frequency compressor. And use this to compromise the efficiency of the program.

In turn, document US 2008/0019852 describes a rigid connecting rod interconnecting the oscillating member rod by means of a thin flexible rod at the end of a "translation rod" which is guided to promote the piston relative to the rod The axial axis of the axial shaft attached to the other end rotates and reduces the lateral rigidity of the part. However, similar to the previous references, the assembly of the flexible rod and the translation rod can compromise the efficiency of the compressor during operation at high frequencies. In addition, this structure involving different materials becomes complicated and expensive.

Further document US Pat. No. 3,801,167 discloses the use of a so-called flexible one connecting rod connected to a uniform cross section of a piston guide, which is in turn fixed to one of the intermediate thin sections and attached to the compressor at the opposite end. Working piston. However, this intermediate rod acts only as a connecting member between the piston guide and the piston of the device, and therefore does not act as a connecting rod as in the subject matter of the present invention.

In short, it is clear that the current state of the art lacks a solution for one of the rods/links that can provide both large axial stiffness, high buckling resistance and low lateral stiffness in a single part. / The assembly procedure is not complicated or expensive, and the rod can be used in high operating frequency equipment with great efficiency and durability.

Accordingly, one of the objects of the present invention is to disclose a rod or connecting rod for a linear compressor that operates primarily at high frequencies, which provides significant axial stiffness, high buckling resistance, and low lateral (horizontal) stiffness.

Another object of the present invention is to provide a connecting rod for a high frequency linear compressor having the above characteristics in a single part containing a single material component, i.e., it does not require the manufacture and joining of different parts, It involves manufacturing procedures and simple assemblies.

The present invention achieves the above object by means of a rod or connecting rod for a linear compressor interconnecting a piston and a resilient member or a resonant spring, the rod comprising one of a length of production from a metallic material a rod having at least two regions of the elevated cross section and at least one intermediate region of the reduced cross section; and at least two regions of the elevated cross section are located at the ends of the elongated rod.

According to a preferred embodiment of the invention, the elongate rod includes at least one intermediate cross section to increase its resistance to buckling of the part and to facilitate the manufacturing process. It is apparent that the reduced cross-sectional area of the rod provides lateral flexibility to the part.

Also in accordance with a preferred embodiment of the present invention, the elongate rod is produced from steel, titanium or a metal alloy containing such materials (which possess higher fatigue resistance).

The invention further includes means for enabling a rod or a connecting rod to be used in a high frequency linear compressor while exhibiting a high axial stiffness, high buckling resistance and low transverse (lateral) stiffness in a single part.

The present invention will be described in more detail based on the above-mentioned figures.

Figure 1 shows a cross section of the active mechanism of a linear compressor, in which it may be noted that a piston 1 is attached to a resilient member 2 by means of the rod of the invention or the connecting rod 3 (which in this case is One of the ends 21 of a resonant spring), the opposite end 22 of the end 21 is attached to a component 6 to secure the magnet motor 7.

The rod or connecting rod of the linear compressor for attention is defined by an elongate rod 3 which is preferably made of steel or titanium or a metal alloy containing such materials (this possesses a high degree of fatigue) Resistant) or other materials with similar characteristics.

As can be seen in the drawings, the elongate rod 3 constituting one of the connecting rods of the linear compressor has at least two regions 4 of an increased cross section, and in a preferred embodiment of the invention, the length Both ends of the rod 3 have this high radial height to increase the rod 3 to the fastening zone of the part, which in this case cooperates the surface of the piston 1 with the end 21 of the resilient member 2.

2 and 3 illustrate another structural possibility for the rod 3 of interest, wherein the part has an intermediate portion 41 of the elevated cross section (which may also be referred to as a "central section") to increase flexion resistance. Sex and promote manufacturing processes. The manufacturing facility is due to the fact that the central section acts as a third support for the tool to effect the thinning of the region of the reduced cross-section 5, the other two supporting the two regions 4 having the enhanced cross-section.

In both embodiments, the elongate rod 3 exhibits a reduced cross-section intermediate portion 5 that imparts lateral flexibility to the part. In this respect, it is worth emphasizing that the material used in the manufacture thereof (preferably as mentioned steel or titanium) allows the rod 3 to exhibit some lateral flexibility without incurring a high wind of part destruction. Risk or loss of life as these materials show high resistance to fatigue.

In Figures 2 and 3, the elongate rod 3 has three regions 4 and 41 of increased cross-section and two intermediate portions 5 of reduced cross-section; however, this is constructed in accordance with one of the preferred embodiments of the present invention. The number of regions 4 and/or 5 of the elongated rod 3 can vary without thereby exceeding the claimed scope of protection.

In turn, Figures 4 and 5 illustrate a shorter rod 3 that may be required for use in a defined apparatus for the space of assembly. In this case, the rod 3 does not provide an intermediate portion 41 of the increased cross section. It should be clarified that in this configuration with only one intermediate zone 5 (which therefore sets one of the parts shorter than the conventional part), the buckling resistance is obtained from the reduced length. Since this shortening leads to an increase in one of the lateral stiffness, the most suitable material for such a situation is titanium, which is less elastic than when compared to steel.

An important feature of one of the objects of the rod or connecting rod 3 of the present invention relates to the fact that it consists of a single piece and is made entirely of a single material or metal alloy, thereby making its production and assembly procedures more The procedure for observing using similar known procedures is more straightforward, and these similar known procedures frequently involve several parts of different materials joined together by any linking procedure, and in addition, the efficiency of introducing compromiseable equipment in the final part is The weakness of reliability.

Briefly stated, the present invention is further directed to enabling a rod or a connecting rod 3 to be used in a high frequency linear compressor while exhibiting a high axial stiffness, high buckling resistance and low cross direction in a single part (lateral ) rigid components.

It should be noted that, although the preferred structural forms of the present invention have been shown, it will be understood that those skilled in the art can devise any omission, substitution, and structural changes without departing from the spirit and scope of the protection. It is also expressly stated that all combinations of elements that perform the same function in substantially the same manner to achieve the same result are within the scope of the invention. It is also intended that the elements of the described embodiments be replaced by other elements.

However, it should be understood that the above description based on the above drawings is only one of the possible embodiments of the system for use in the present invention, and the actual scope of the subject matter of the present invention is defined in the scope of the accompanying patent application. .

1‧‧‧Piston

2‧‧‧Rebound parts

3‧‧‧ rod or connecting rod / elongated rod / shorter rod

4‧‧‧Area

5‧‧‧Reduced cross section/middle part/intermediate area

6‧‧‧ Parts

7‧‧‧ Magnet motor

End of 21‧‧‧

22‧‧‧relative ends

41‧‧‧Intermediate area

1 shows a longitudinal section view of one of the compressors operated at a high frequency by a linear motor, wherein one of the possible embodiments of the connecting rod/rod for the linear compressor target of the present invention is used; A perspective view of a connecting rod constructed in accordance with a preferred embodiment of the present invention having a central section; FIG. 3 is a front elevational view of the subject matter shown in FIG. 2; FIG. 4 is a view showing a central section A perspective view of one of the connecting rods constructed in accordance with a second preferred embodiment of the present invention; and FIG. 5 shows a front view of the subject matter shown in FIG.

3‧‧‧ rod or connecting rod / elongated rod / shorter rod

4‧‧‧Area

5‧‧‧Reduced cross section/middle part/intermediate area

41‧‧‧Intermediate area

Claims (3)

A rod or connecting rod for a linear compressor, more particularly for interconnecting a piston (1) with a resilient member or a resonant spring (2), characterized in that it comprises: one of the production of metal materials An elongated rod (3) having at least two intermediate regions (5) having an elevated cross-section (4) and at least one reduced cross-section; and at least two having an elevated cross-section The zone (4) is located at the end of the elongated rod (3) and is used to enable a rod or a connecting rod to be used in a high frequency linear compressor while exhibiting a high axial stiffness, high buckling resistance in a single part And components with low lateral rigidity. A rod according to claim 1, wherein the elongated rod (3) comprises at least one intermediate portion (41) of a high cross section. The rod of claim 1, wherein the elongate rod (3) is produced from steel, titanium or a metal alloy containing the materials.