COMPRESSOR OF VAIVÉN
Field of the Invention The present invention relates to a reciprocating compressor that is to be used, for example, to compress a refrigerant in a domestic refrigerator. In particular, the present invention relates to an improvement of a valve mounting portion that is for opening and closing a discharge unit in the compression section.
BACKGROUND OF THE INVENTION A reciprocating compressor of this type has a schematic construction as in Figure 1 illustrating a compressor 1000. In Figure 1, the compressor 1000 comprises an assembly. According to the construction of this assembly, a motor section 200 is driven by electric power fed from a power dispatching section 100 that supplies electrical power 101. It is connected to a reciprocating compression section 300 to the motor section 200. for compressing a refrigerant fluid that is introduced from a take route 601 into a take section 600 through a valve assembly 500. The refrigerant fluid compressed in this manner is discharged from a discharge path 701 into a discharge section 700. The built-up assembly of this
In this way, it is assembled and accommodated inside a closed container 900 elastically by means of a shock / support section 800. Additionally, a construction is provided by which the lubricating oil 401 stored in the bottom of the closed container 900 is circulated for lubrication to a mechanical kinetic portion between the engine section 200 and the reciprocating compression section 300 by means of a 400 oil feeder. Various proposals have been made about concrete structures of various portions in the previous construction of the compressor (see Japanese Patent Publication Number H04 (1992) 4894). Since a piston reciprocates at a high speed of approximately 3,000 rpm, several improvements have been made with respect to the construction of the valve assembly 500. For example, a construction has been proposed using a valve assembly, the valve assembly that is provided with a thick plate as a restriction member having an appropriate divergent angle, the restriction piece that is placed on a posterior side of a tongue valve that is to open and close a discharge hole, so that not only the degree of opening of the tongue valve is restricted but also the return speed of the tongue valve is increased to improve the efficiency of
compression (see Japanese Utility Model Publication Number H02 (1990) 25986). A construction using a valve assembly has also been proposed wherein a tongue valve and a plate spring are positioned as a restraining piece superimposed on a rear side of the tongue valve within a depression of a valve seat, and about half of a portion covering a discharge port of the tab valve that is covered with the restriction piece, whereby the tab valve opens in so far as it has a twisted surface, a fluid discharge direction. is established towards a
, exit through the twisted surface, and closing speed is increased by a return effort of twisting (see U.S. Patent Number 4,723,896). However, all of the above, conventional, valve assemblies adopt a valve construction comprising a discharge orifice, a tab valve to open and close the discharge orifice, and a restriction piece positioned on the back side of the valve of tongue. Therefore, in a compressor provided with this valve assembly, the discharge resistance is still high, resulting in a decrease in compression efficiency, and thus there is a
space for improvement.
Brief Description of the Invention It is an object of the present invention to provide a reciprocating compressor using a valve construction provided with plural discharge orifices., tongue valves and restriction / repulsion parts (hereinafter referred to as "valve holders"), thereby decreasing the discharge resistance and improving the compression efficiency. To achieve the aforementioned object, in one aspect of the present invention, there is provided a reciprocating compressor having within a closed container a reciprocating compression section for compressing a required fluid, the reciprocating compression section comprising a unit discharge to discharge the fluid and a valve assembly for opening and closing the discharge unit, with a plurality of discharge orifices that are formed in the valve assembly, the valve assembly comprising valve members, the valve members which comprise tab valves positioned in a manner corresponding to the discharge ports and valve holders positioned respectively on the rear sides of the tab valves, a valve seat having a depression for receiving the members
valve therein, and means for attaching valve members to push the end sides of the valve members to secure the valve members elastically to the depression setting positions. In a second aspect of the present invention, there is provided, in combination with the first aspect above, a reciprocating compressor wherein the tab valves are each formed in a shape comprising fulcrum portions protruding on both sides in an associated portion of the fixing portions, a portion intermediate protruding in a perpendicular or oblique direction with respect to a line joining the fulcrum portions, and a lid portion for closing the associated hole of the discharge orifices, the lid portion that is on the side opposite the portions of fulcrum with respect to the intermediate portion, the fulcrum portions, the intermediate portion and the portion of the lid that are integral to each other, and The valve holders are each formed in a shape comprising the same fulcrum portions as those of each of the tab valves, an intermediate portion having a tapering portion projecting in an oblique direction with respect to a line joining the fulcrum portions, and an opposite terminal portion narrower than the lid portion of each of the tab valves, portions of
fulcrum, the intermediate portion and the opposite terminal portion that are integral with each other. In a third aspect of the present invention, there is provided, in combination with the second aspect above, a reciprocating compressor wherein the tab valves are positioned in such a manner that the lid portions of the tab valves are positioned in a manner The central and the fulcrum portions of one of the tongue valves and the fulcrum portions of the other tongue valve are placed outside the lid portions, and the valve holders are positioned in such a way that the intermediate portions of the valves are placed in such a manner that Valve holders are placed in different directions from each other with respect to the line joining the fulcrum portions. In a fourth aspect of the present invention, there is provided, in combination with the second or third aspect above, a reciprocating compressor wherein the fixing means of the valve members are formed in a form comprising fixing portions for fixing the fulcrum portions of the valve members to the fixing portions of the depression and a spring portion for connecting the securing portions of the securing means of valve members to each other and for pushing the fulcrum portions of the valve members. valve elastically to the fixing portions of the depression, the portions
of fixation and the portion of spring that are integral to each other. In this manner, the reciprocating compressor in the first aspect of the present invention has within a closed container a reciprocating compression section for compressing a required fluid, the reciprocating compression section comprising a discharge unit for unloading. the fluid and a valve assembly for opening and closing the discharge unit, with a plurality of discharge orifices that are formed in the valve assembly, the valve assembly comprising valve members, the valve members comprising valves, tabs positioned correspondingly to the discharge ports and valve holders respectively placed on the rear sides of the tab valves, a valve seat having a depression for receiving the valve members therein, and means for fixing the members valve to push the end sides of the valve members to fix the valve members elastically to the fixing portions of the depression. With the means for fixing the valve members, the valve members can be elastically fixed to the fixing portions of the depression. In addition, with the elasticity of the valve holders,
the restriction and the repulsive return of the tongue valves are made to offer an effect of improving the efficiency of a pressurization operation. Additionally, since the adopted valve assembly uses a valve construction provided with plural discharge orifices and also provided correspondingly with tab valves and valve holders, an outstanding effect is achieved such that it is possible to decrease the discharge resistance and Improve compression efficiency. According to the reciprocating compressor in the second prior aspect of the present invention, in combination with the first aspect above, the tongue valves are each formed in a shape comprising fulcrum portions protruding on both sides in the associated portion of the fixing portions, an intermediate portion projecting in a perpendicular or oblique direction with respect to a line joining the fulcrum portions, and a lid portion for closing the associated hole of the discharge orifices, the lid portion that is on the side opposite the fulcrum portions with respect to the intermediate portion, the fulcrum portions, the intermediate portion and the lid portion that are integral with each other, and the valve holders are each formed in a shape comprising the same fulcrum portions as
those of each of the tab valves, an intermediate portion having a tapering portion projecting in an oblique direction with respect to a line joining the fulcrum portions, and an opposite terminal portion narrower than the portion of cover each of the tongue valves, the fulcrum portions, the intermediate portion and the opposite terminal portion that are integral with each other. By placing the fulcrum portions in the fixing portions of the depression through the fixing means of the valve members, it is possible to fix the valve members easily and positively. In addition, the tongue valves when opened can each be allowed to perform a movement such as the letter S that is stretched obliquely and the head portion bent. In the resistance to this cubically complicated bending manner, an internal stress is stored in the tongue valves by themselves and the valve holders, and with the resulting repulsive force it is possible to further increase the return speed of the tongue valve, thereby offering a further outstanding effect that the compression efficiency can be further improved. According to the reciprocating compressor in the third aspect of the present invention, in combination
with the second previous aspect, the tongue valves are positioned in such a way that the lid portions of the tongue valves are centrally positioned and the fulcrum portions of one of the tongue valves and the fulcrum portions of the other tab valve are positioned outside the lid portions, and the valve holders are positioned in such a way that the intermediate portions of the valve holders are placed in different directions from each other with respect to a line joining the portions of fulcrum. Since the tongue portions open as they are bent in opposite directions, the collision of the refrigerant gases discharged from the tongue valves is decreased and the discharge resistance is further reduced, thus offering an additional outstanding effect. the compression efficiency can be further improved. According to the reciprocating compressor in the fourth aspect of the present invention, in combination with the second or third aspect above, the fixing means of the valve members are formed in a form comprising fixing portions for fixing the portions of fulcrum of the valve members to the fixing portions of the depression and a spring portion to connect the fixing portions of the means
for fixing the valve members to each other and for pushing the fulcrum portions of the valve members elastically to the fixing portions of the depression, the fixing portions and the spring portion which are integral with each other. An additional protruding effect can be obtained that the valve members can be fixed to the aforementioned depression easily and positively by one of the means for fixing the valve members.
Brief Description of the Figures Figure 1 is a block diagram showing a complete construction common to both a reciprocating compressor according to one embodiment of the present invention and according to the prior art; Figure 2 is a sectional view showing a complete construction of the embodiment of the present invention in a split-part state; Figure 3 is a perspective view partially in section, showing a complete construction of the embodiment of the present invention in an assembled state of the various constituent portions; Figure 4 is an enlarged diagram showing the main portions of Figure 2 in detail; Figure 5 is an explanatory diagram showing
a mounted state of the various portions related to a valve assembly used in the embodiment of the present invention; Figure 6 (A) is an explanatory plan view showing a mounted state of the various portions related to the valve assembly in the embodiment of the present invention, Figure 6 (B) is an explanatory plan view showing in detail the main portions of the tab valves and valve holders shown in Figure 6 (A), and Figure 6 (C) is an explanatory plan view showing a state in which the valve holders are placed on the sides rear of the tongue valves respectively; Figure 7 is an explanatory sectional view taken on line A-A in Figure 6 (A); and Figure 8 is an explanatory diagram showing a state in which a valve holder is placed on the back side of a tab valve.
Detailed Description of a Preferred Modality With reference to the appended figures, a reciprocating compressor according to an embodiment of the present invention will be described in detail hereinafter. Figure 1 is a block diagram showing
A complete construction common to both a reciprocating compressor according to one embodiment of the present invention, FIG. 2 is a sectional view showing a complete construction of the embodiment of the present invention in a condition with part separation, FIG. is a partially sectioned perspective view, showing a complete construction in an assembled state of the various constituent portions, Figure 4 is an enlarged diagram showing major portions of Figure 2 in detail, Figure 5 is an explanatory diagram that shows a mounted state of the various portions related to a valve assembly used in the embodiment of the present invention, Figure 6 (A) is an explanatory plan view showing a mounted state of the various portions related to the valve assembly in the embodiment of the present invention, Figure 6 (B) is an explanatory plan view showing in detail the main portions of the pads of the tab valves and valve holders shown in Figure 6 (A), and Figure 6 (C) is an explanatory plan view showing a state in which the valve holders are placed on the back sides of the tab valves respectively, Fig. 7 is a sectional view taken on the line AA in Fig. 6 (A), and Fig. 8 is an explanatory diagram showing a state in which
Place a valve holder on the back side of a tongue valve. The functional portions represented by the reference numbers are assembled by the combinations indicated with fine lines and chain lines and are assembled and fixed or coupled using set screws and retaining springs. In the attached figures, the portions of the same reference numbers represent portions having the same functions, and the portions of the same reference numbers as in Figure 1 represent portions having the same functions as those of the 'portions of the same reference numbers. illustrated in Figure 1. In Figures 1 to 3, an extractor 210, a rotor 220, a rotatable shaft 230 and a bearing 240 are assembled together to form a motor section 200, which is connected to a delivery section 100 of Energy. A section 800 of shock absorbers / support is constituted by a coil spring or the like. An increasing plate 231 is formed integrally in a lower end portion of the rotatable shaft 230 in the engine section 200 and an eccentric pin 310 is placed on the side opposite the plate 231 of increasing roll, thereby constituting a movement mechanism to make the eccentric spigot
310 perform a movement that describes a circular route. A movement mechanism that is driven by the eccentric pin 310 to create a reciprocating linear movement is constituted within a T-shaped crank tube 330, and a piston 340 reciprocates or reciprocates within a circular hole in a cylinder 350 to effect a compression action. A reciprocating compression section 300 is constituted by the portions of the eccentric shank 310 to the cylinder 350. A valve assembly 500, which is mounted in contact with the cylinder 350, is composed primarily of a packing 551, a valve member 510. side outlet, a valve seat 520, two tongue valves 530, two valve holders 540, valve member fixing means 570, and a gasket or gasket 550. These portions are interleaved between a cylinder end surface 352 350 constituting the reciprocating compression section 300 and a terminal surface 713 of a head silencing member 710 constituting a discharge section 700, and then fixed with screws for mounting. In this way, the portions in question are retained by grip and are fixed between the end surface 352 of the cylinder 350 and the silencing member 710 of the discharge section 700. The reference number 600 denotes a section of
taking. A refrigerant fluid introduced from a tap path 601 passes through a silencer (not shown) provided with a filter for filtering mixtures, etc., received in a conduit of an object of use, passes additionally through a resonance chamber , and is inserted into the valve assembly 500. As the solvent used in this embodiment, an HFC refrigerant is used, for example, R134a. On the other hand, the refrigerant fluid after compression passes through the valve assembly 500 and then through plural mufflers 720 having resonance chambers adapted to resonate with a vibration of fluid of a different frequency to dampen the sound, then it passes through a route that extends from a discharge tube (not shown) to a discharge route 701. In this way, a discharge section 700 is constituted. After assembly of the above constituent portions, an upper container 920 of a closed container 900 fits into a lower container 910 in a hermetically sealed state, whereby a reciprocating compressor 1000, hermetically sealed, integrated, as shown, is provided. in Figure 3. In this state, lubricating oil 401 is charged through a discharge tube 402 into the lower container 910. A
The oil feeder 400 is constituted to absorb the lubricating oil 401 by rotating the rotating shaft 230 at high speed and circulating it to several constituent portions. The number 360 denotes an intrafill discharge tube for discharging a portion of the compressed refrigerant in the closed container 900 to increase the internal pressure to a high level. Next, detailed portions of the valve assembly 500 will be described below with reference to Figs. 4 to 8. As shown in Fig. 4, the valve assembly 500, which is mounted in contact with the cylinder 350, is composed primarily of a gasket 551, a side intake valve member 510, a valve seat 520, two tongue valves 530A, 530B, two valve holders 540A, 540B, valve member attachment means 570, and a 550 packing These portions are sandwiched between the end surface 352 of the cylinder 350 which constitutes the reciprocating compression section 300 and the end surface 713 of the silencer 710 constituting the discharge section 700, and are then fixed with screws and assembled. Additionally, a take or entry route is formed that extends along an arrow from the right to the
left in figure 4 and a discharge path that extends along an arrow from the left to the right in the same figure. More specifically, HE . they provide two discharge orifices 522A and 522B from which the refrigerant is discharged with a high-speed reciprocating movement of the piston 340 within the cylinder 350. The reed valves 53OA and 53OB are for the opening and closing of the holes 522A and 522B of discharge and the valve holders 540A and 540B, which are for restraint and repulsion of the openings in the reed valves 53OA and 53OB, are respectively placed on the rear sides of the reed valves 530A and 530B to form the members 560 valve. The valve members 560 are received in predetermined positions
(523A, 523B) of a depression 523 formed in the valve seat 520. Subsequently, the end sides of the valve members 260 are pushed by the valve member securing means 570 for securing the valve members elastically to predetermined fixing portions (523A, 523B) of the depression 523 (see figures 5 to 7). ). The packing 551 is interposed between the cylinder 350 and the intake side valve element 510 and is formed by forming a resin plate, eg, a rubber plate
Butyl is filled with fiber, as illustrated. The gasket 551 is provided at its outer periphery with a peripheral edge portion for closing the peripheral portion between it and the cylinder 350, as well as the side-side valve element 510, and is also provided with a tap passage 551A / discharge. The intake side valve member 510 comprises a tongue valve 511, the tongue valve 511 which is formed by forming a cut near the center of a flat plate spring, for example, a stainless steel plate spring having both polished surfaces, and discharge holes 512A and 512B formed outside a base portion of the tongue valve 511, the discharge holes 512A and 512B which are a little larger than the discharge holes 522A and 522B of the valve seat 520. The tab valves 530A and 530B are each formed by forming a flat plate spring, for example, a thin stainless steel plate spring having both surfaces polished, in the manner illustrated. According to this form, as shown in Figure 6 (B), two fulcrum portions 581 and 582 projecting on both sides, at one end corresponding to a tab valve fastening portion 535, a portion 533 intermediate extends along a central line (y) that is perpendicular to a central line (x) that joins the two
fulcrums, and a cap portion 534 having a diameter capable of closing the associated hole of the discharge ports 522A and 522B is formed at an end opposite one end with respect to the intermediate portion 533. As shown in FIGS. to 7, the tab valves 53OA and 53OB are placed in predetermined fixing portions (523A, 523B) of the depression 523 in a manner such that the cover portions 534 of the tab valves 53OA and 53OB are centrally positioned, while the fulcrum portions 531 and 532 of a tongue valve 530A and the fulcrum portions 531 and 532 of the other tongue valve 53OB are positioned outside the lid portions .534. The valve holders 540A and 540B are positioned in such a way that the intermediate portions 543 of the valve holders 54OA and 54OB are placed in different directions with respect to the lines connecting the fulcrum portions 541 and 542 of the holders 5 OA and 5 valve OBs. A description will now be made about the valve holder 540A. According to the shape of the valve holder 54OA, as shown in Figures 6 (A) to 6 (C), the intermediate portion 543 extends along a central line (z) that is oblique at an angle of ? in relation to the central line (y) perpendicular to a central line (x) joining the fulcrum portions 541 and
54, and an opposite end portion 544 is formed on a terminal side opposite the side of the fulcrum portions with respect to the intermediate portion 543. Figure 6 (C) shows a state in which the holders 540A and 540B are placed. valve on the back sides of the reed valves 53OA and 53OB, respectively. By placing the valve holders 54OA and 54OB in this manner, the tab valves 53OA and 53OB are raised from below and folded in opposite directions and opened in the illustrated state by virtue of a discharge pressure. Accordingly, the collision between the refrigerant gas discharged from the tab valve 53OA and that which is discharged from the tab valve 53 OB is decreased, so that it is possible to further decrease the discharge resistance and improve the compression efficiency. Valve holders 54OA and 54OB are each formed by forming a flat plate spring, for example, a thin stainless steel plate spring having both sides polished, in the manner illustrated. As is the case with the tab valves 53OA and 53OB, two fulcrum portions 541 and 542 projecting on both sides are formed at one end corresponding to a valve holder fastening portion 549 and an intermediate portion 543 extends at an oblique direction at an angle
default of? as noted above with respect to a line joining the two fulcrums, the intermediate portion 548 which extends to become narrower gradually from the base portions of the fulcrum portions 541 and 542 and form a tip end 544 in the fulcrum. opposite end side, the tip end 544 having a width of about half the cover portion 534 in each of the tab valves 53OA and 53OB. The fastening portion 549 of valve holders including the fulcrum portions 541 and 542 and the tip end 544 are formed so that their surfaces are parallel to each other, while the intermediate portion 543 is formed in a shape that has surfaces curved along quadratic curves with a small curvature on one side 543.1 close to the portion 549 of fastening of valve holders and a large curvature on one side 543.2 near the tip end 544. According to this form of the valve holders 5 OA and 54OB, when the tab valves 53OA and 53QB are raised from below in the illustrated state by virtue of a discharge pressure, they deform with elastic deformation of the holders 540A and 540B valve and along the shape of the valve holders. In addition, the smaller width of the tip end 544 allows the tab valves 53OA and 53OB to be twisted further
easily. The valve member fixing means 570 is formed by forming a thick metal plate, for example, a plate spring of stainless steel, in the manner illustrated and is constituted of the fastening portions 570A and 570B for securing the portions 531, 532, 541 and 542 of the fulcrum of the valve members 560 to the fixing portions 523A and 523B of the depression 523 and a spring portion 570C for connecting the fastening portions 570A and 570B to each other and for pushing the portions 531, 532 541 and 542 of the fulcrum of the valve members 560 elastically to the 523A and 523B fixing portions of the depression 523, the fixing portions 570A, 570B and the spring portion 570C that are integral with each other. The fixing portions 570A and 570B of the valve member fixing means 570 are mounted from above the fulcrum portions 531, 532, 541 and 542 to the fixing portions 523A and 523B of the depression 523. In this way, the valve members 560 can be easily fixed in a positive manner by one of the means 570 for fixing the valve members. In this state, the valve assembly 500 is interposed and fixed between the end surface 352 of the cylinder 350 and the head silencing member 710 in the discharge section 700, whereby the members 560 of
Valve is prevented from uncoupling under vibration or similar. The valve seat 520 is formed by forming a rather thick metal plate, for example, a stainless steel plate in the manner illustrated, which is in accordance with the profile of the fulcrum portions 531 and 532 of the valves 53OA and 53OB of tongue. According to the shape of the valve seat 520, a depression 523 is formed, the depression 523 comprising fastening portions 523A and 523B as a first fastener into which the fulcrum portions 531, 532, 541, 542 of the valves enter. 53 OA, 53OB of tab and valve holders 54OA, 54OB enter a mutually superimposed state and a second depression into which the other portions of the fulcrum portions of the tab valves 530A, 530B and the holders 540A, 540B enter. valve, the first and second depressions that are contiguous with each other. Additionally, discharge ports 522A and 522B are formed in the second depression in positions corresponding to the cover portions 534 of the tab valves 530A and 530B. In the valve seat 520, the depression 523 is formed by stamping and both surfaces thereof are finished by polishing. The discharge orifices 522A and 522B are formed with the peripheral rib-like surfaces 522C,
which are polished to form contact surfaces for the reed valves 53OA and 53OB. Additionally, a tap hole 521 is formed in the free flat portion of the depression 523 in a position corresponding to the tab valve 511 of the intake side valve member 510. The packing 550 is interposed between the valve seat 520 and the head silencing member 710 in the discharge section 700 and is formed by forming a resin plate, for example, a butyl rubber pad filled with fiber, in the form illustrated The package 550 is provided with a peripheral edge portion for closing the peripheral portion between the valve seat 520 and the head silencing member 710 and is also provided with a dividing portion 554 for division between a small chamber 558 on the socket and a small 559 camera side discharge. The member 710 of the head muffler in the discharge section 700 is formed by forming a rather thick metal plate, for example, a stainless steel plate, in the illustrated manner, in which a hole is formed as a passage (no. shown) leading to the discharge route 701. The above constituent elements, ie, all of the packing 551, valve side member 510 of
socket, valve seat 520, valves 530A, tongue 530B, valve holders 540A, 540B, valve member fixing means 570, packing 550, and member 710 head silencer, are demagnetized to prevent mutual stickiness in the operation. As shown in Figure 6 (A), the valve seat 520, the tongue valve 530A (530B), and the valve holder 540A (540B), when mounted, overlap one another in plan. In the section of figure 6 (A), ie, in a longitudinal section taken along the center of the tongue valve 530A and that of the tongue valve 530B, the main portions are as shown in figure 7 In the section of Figure 6 (A) taken on line AA, the shape of the tongue valves 530A, 530B and that of the valve holders 540A, 540B are in a pressure free state. Additionally, in the valve members 560 constituted by the tab valves 530A, 530B and the valve holders 540A, 540B, the tab valve fixing portions 535 and the valve holder fastening portions 549 at one end including the fulcrum portions 531, 532, 541 and 542 are retained by the means 570 for fixing the valve members. Since the valve holders 540A and 540B
are placed in the illustrated manner, when the compressed fluid is discharged from the discharge orifices 522A and 522B and a discharge pressure is imposed on the tab valves 53OA and 53OB, the tab valves are raised from above in the illustrated state , by virtue of the discharge pressure and exhibit a complicated way of flexing in opposite directions. This bending or bending is a three-dimensionally complicated way of bending or bending as if a cobra raised its head and twisted its neck, that is, a way of bending as if the letter S were drawn thinly and the head of it was twisted . Accordingly, an internal stress resistant to bending or bending is stored in the reed valves 53OA, 53OB and the valve holders 540A, 540B. When a discharge is made from the discharge pressure to a counterpressure in this state, a restoring force that acts to correct the bending or bending of the reed valves 53OA, 53OB and closes the discharge orifices 522A, 522B appears as a force strong repulsive due to the internal stress against the three-dimensional complicated way of bending, anterior, and acts as a force to harden the previous S turn. Accordingly, the tab valves 53OA and 53OB perform this abrupt operation in accordance with their tip portions, it is
say, the lid portions 534 are thrown against the discharge orifices 522A and 522B. As a result, the tab valves 53OA and 53OB close the discharge orifices 522A and 522B before the back pressure and operate so that the amount of fluid returning to the discharge orifices 522A and 522B under the back pressure can be lowered to the degree extreme. Thus, in this closed type back and forth compressor 1000, the valve members 260 can be fixed easily and positively to the fixing portions 523A and 523B of the depression 523 by the means 570 for fixing the valve members and the Repulsive return and restriction of the 530A and 530B tab valves are performed with elasticity of the valve holders 5 0A and 540B to offer an effect of improving the efficiency of the pressurization operation. Additionally, since the valve assembly 500 is of a valve construction that includes two discharge ports 522A, 522B, two tab valves 530A, 530B and two valve holders 540A, 540B, the discharge resistance is further decreased and improves compression efficiency. Accordingly, when the reciprocating compressor 1000 is used as a compressor in a refrigerator, the performance coefficient in the refrigerator is improved. The previous modality is to explain the present
invention and does not limit the invention or restrict the scope of the claims. The constructions of the various constituent portions in the present invention are not limited to those described in the above embodiment, but various modifications can be made within the technical scope described in the claims. According to the reciprocating compressor of the present invention, the valve members can be fastened to the fixing portions of the depression in the valve seat easily and positively by means of fastening valve members. In addition, the restriction and repulsive return of the tongue valves is carried out with the elasticity of the valve holders to give an effect of improving the efficiency of the pressurization operation. In addition, since the valve assembly used a valve construction provided with several discharge orifices, several tab valves and several valve holders, the discharge resistance is further decreased and the compression efficiency is improved. When the reciprocating compressor is used as a compressor in a refrigerator, an outstanding effect is obtained since the coefficient of performance in the refrigerator is improved. In this way, the reciprocating compressor of the present invention is of great industrial utility.