JP2009520144A - Cooling compressor valve mounting structure - Google Patents

Abstract

  Valve for cooling compressor comprising a compression chamber (3) closed by a valve plate (4, 20) having a suction orifice (5, 21) closed by a valve element (10) having a mounting end portion (11) Mounting structure. The mounting structure comprises first holding means (8, 9) for holding the mounting end portion (11) of the valve element (10) inside the receiving recess (23) of the valve plate (4, 20), and a receiving recess ( 23) and / or at least one alignment protrusion (40) held by the mounting end portion (11) of the valve element (10) and fitted in the alignment recess (30) of the other portion and / or the first Prior to mounting the retaining means, it is provided between the receiving recess (23) and the mounting end portion (11) of the valve element (10) to prevent movement of the valve element from the receiving recess (23). Second holding means (50).

Description

  The present invention relates to a valve mounting structure that is not a single component type of a cooling compressor used in a small cooling system or the like.

  The energy efficiency of a refrigeration compressor is largely due to the good performance of the valves that control the gas flow.

  In a reciprocating cooling compressor, the compression of the refrigerant gas is accomplished by the movement of a piston driven by a drive means such as a connecting rod, crankshaft or linear motor mechanism. The piston reciprocates inside the compression chamber and when it begins to return from top dead center to bottom dead center during the suction stroke, it comes from the suction line of the cooling system to which the compressor is connected (ie, the evaporator of the cooling system) ) Pull out the refrigerant gas. Subsequently, when this piston returns from bottom dead center during its compression process, it compresses refrigerant gas under high pressure (condensation), which flows through the discharge system and returns to the cooling system to which the compressor is connected. .

  A reciprocating refrigeration compressor uses a one-way valve that controls the gas flow during its operation. A valve system housed in the head serves to optimize the flow rate adjustment and gas flow dynamics during the suction and release of refrigerant gas with respect to the compression cylinder. The suction valve controls the gas flow drawn into the compression cylinder from a suction line connected to the low pressure side of the cooling system, and the discharge valve controls the gas flow leading to the high pressure side of the already compressed cooling system.

  The suction valve not only adjusts the gas flow during suction, but also has a role of adjusting the opening and closing pendulum movements in synchronization with the displacement of the piston. Indeed, for good performance of the compression cycle, it is desirable to increase the efficiency of the volume in anticipation of opening the suction valve (with respect to reaching the top dead center of the piston).

  In general, the suction and discharge valves include one or more passage orifices and vanes fixed at one of its ends, and when the pressure differential is established by the valves, the vanes move and gas in the desired direction required. Allowing passages.

  The suction valve system has a myriad of embodiments that apply to reciprocating compressors with respect to the sealing device, valve seat, gas passage orifice, and how the valve is attached.

  In a single-part construction where the suction valve is made from a layered plate mounted on the valve plate, the suction valve is typically a head screw that attaches the single-part suction valve to both the valve plate and the head (Figure 1) Is dimensioned to limit its lateral movement. This construction minimizes the possibility of lateral and transverse movement that can change the position of the suction valve when mounted on the valve plate. Despite this advantage, this structure presents a high cost for the raw materials consumed to manufacture this suction valve. Furthermore, such a structure requires additional machining operations on the base valve plate surface.

  In known prior art arrangements for mounting a single part suction valve, the suction valve is replaced by a valve or valve element that is not made in a single part and housed in a recess formed in the valve plate (FIG. 2), the fixing of the valve element to the valve plate is achieved by mechanically connecting the parts, generally by rivets or spot welding.

  Even though there is no structural imperfection of the single part suction valve, this solution has the disadvantage of requiring an additional step of mounting the valve plate assembly and accurately places the valve element in the recess. It is necessary to ensure that it is placed.

  Accordingly, it is an object of the present invention to provide a valve mounting structure for a cooling compressor that provides and maintains a simple and reliable arrangement of valve elements on a valve plate. Another object of the present invention is to provide an arrangement as described above that reduces the process steps of mounting a valve element on a valve plate.

  An additional objective is to provide the above arrangement with reduced costs.

  These and other objectives have one end within which is closed by a valve plate having at least one suction orifice and at least one discharge orifice, each attached to an adjacent surface of the valve plate. A cylinder defining a compression chamber selectively closed by each valve element having a mounted end portion, a folding intermediate portion, and a sealed end portion operatively associated with each orifice on the valve plate. This is achieved by a valve mounting structure for a compressor of the type having a receiving recess provided on the valve plate for receiving the mounting end portion of the valve element, and a mounting end portion of the valve element. First retaining means seated and secured to this adjacent surface of the valve plate for retaining within the receiving recess; At least one portion of at least one alignment projection held in at least one of the receiving recesses of the valve plate and the mounting end portion of the valve element and fitted in each of the alignment recesses provided in addition to this portion; Second holding means provided between the receiving recess and the mounting end portion of the valve element to prevent the valve element from moving outwardly from the receiving recess of the valve plate before mounting the first holding means; including.

  Furthermore, the object of the present invention is achieved using a valve mounting structure for a cooling compressor of the kind described above, which receives a receiving recess for receiving the mounting end portion of the valve element provided on the valve plate (this receiving recess is To have the outer shape of the mounting end portion similar to the outer shape of the mounting end portion so that the mounting end portion is securely disposed in the receiving recess) and to hold the mounting end portion of the valve element in the receiving recess First retaining means seated and secured to this adjacent surface of the valve plate at least one of the receiving recesses of the valve plate and the mounting end portion of the valve element and provided in addition to this portion At least one portion of the at least one alignment protrusion that fits into the respective alignment recess and the valve element is removed from the receiving recess of the valve plate before mounting the first retaining means. And a second holding means provided between the receiving recess and a mounting end portion of the valve element so as to prevent it from moving in direction.

  The present invention will be described below with reference to the accompanying drawings given as examples of one embodiment of the present invention.

  The present invention relates to a compressor chamber defined inside a cylinder 1 between a top of a piston 2 and a valve plate 4 seated on an end portion of the cylinder 1 inside a housing (not shown). 3, a cooling compressor including a motor compressor assembly, including a cylinder 1 that houses a reciprocating piston 2 is described, and this prior art valve plate 4 is described below.

  Further, the compressor holds an electric motor (not shown) that drives the piston 2 in the suction and compression strokes of the refrigerant gas of the cooling system to which the compressor is connected, and this refrigerant gas is cooled by the compressor. It flows into the compression chamber 3 from the suction line of the system.

  The prior art valve plate 4 shown in FIGS. 1 a, 1 b and 2 is provided with at least one suction orifice 5 and at least one discharge orifice 6, each suction valve held on the valve plate 4. 7 and a discharge valve (not shown) are selectively closed.

  In the prior art structure shown in FIGS. 1a and 1b, the suction valve 7 comprises a support blade 7b made of a material having characteristics suitable for the operation of the flexible blade 7a when the suction orifice 5 is opened and closed. It is of the type that includes a flexible blade 7a punched therein and is attached between the valve plate 4 and the cylinder cover 8 by suitable means (not shown). A hole 7 c is provided in the support blade 7 b and receives a fixing means (not shown) for holding the support blade between the cylinder cover 8 and the valve plate 4. The cylinder cover 8 separates the high and low pressure sides and defines at least one suction chamber (not shown) that maintains fluid communication with the compression chamber 3 via the suction orifice 5 therein. Attached to.

  In the structure of the prior art shown in FIG. 2, the suction valve 7 is in the form of a valve element welded to a recess 4a formed on the valve plate 4, and the outer shape is a suction valve mounted in the recess 4a. It is similar to the outer shape of 7 and on the outside.

  These prior art structures have the disadvantages already mentioned above.

  As described above and shown in the accompanying drawings, the present invention relates to a valve mounting structure for a cooling compressor of the type described above and has a mounting end portion 11 attached to an adjacent surface of the valve plate 20 of the present invention. And at least one valve element comprising a bent intermediate portion 12 to be described next and a sealed end portion 13 operatively associated with each orifice on the valve plate 20, which is a suction orifice 21 in the structure shown. 10 and the valve element 10 is a suction valve.

  In the illustrated valve element 10 configuration, the folding intermediate portion 12 includes an intermediate opening 14 aligned with a discharge orifice 22 defined on the valve plate 20, and the valve element 10 is sealed to the folding intermediate portion 12. Both toe portions 13 are given a U-shape with legs joined by the mounting end portion 11.

  In accordance with the present invention, the valve element 10 has a geometry that is defined and determined to obtain a vane having an optimal ratio between stiffness and maximum bending stress, as previously described.

  The valve element 10 of the present invention is defined in a sheet made from a reduced thickness flexible material and has an outer edge 15 that defines an outer profile of the valve element 10, for example, a substantially U-shape, And an inner edge 16 that defines the contour of the intermediate opening 14. According to the invention, the valve plate 20 is provided with at least one suction orifice 21 and at least one discharge orifice 22, which further receives a mounting end portion 11 of the valve element 10. A recess 23 is provided, the receiving recess 23 having a mounting end portion securely disposed in the receiving recess 23 so that the mounting end portion 11 prevents lateral movement in the receiving recess 23. In addition, it has an outer shape that is similar to the outer shape of the mounting end portion 11. With this structure, the mounting end portion 11 is held by an interference fit within the receiving recess 23 against lateral displacement of the mounting end portion 11 and the receiving recess 23 in the seating surface of this portion.

  The valve plate 20 of the present invention is obtained, for example, by sintering. However, the present invention also contemplates manufacturing by stamping or machining, which is the most expensive.

  In a particular form of the invention, as shown in the accompanying drawings, the receiving recess 23 has a profile corresponding to the respective valve element 10 along its entire periphery, the profile of the receiving recess 23 being the valve element 10. A minimum clearance from the adjacent contour of the valve element 10 is maintained in the bent intermediate portion 12 and the sealed end portion 13 of the valve element 10 so as not to impede the closing and opening of these parts.

  The valve mounting structure of the present invention includes at least one alignment recess 30 provided in at least one of the receiving recess 23 of the valve plate 20 and the mounting end portion 11 portion of the valve element 10, and the receiving recess of the valve plate 10. 23 and held by at least one of the mounting end portions 11 of the valve element 10 and provided to other portions to prevent relative displacement between the valve element 10 and the valve plate 20 at the seating surface of this portion. It further includes at least one alignment protrusion 40 fitted in the alignment recess 30 to be formed.

  Within the concepts provided herein, it is possible to create different structures for the alignment recesses and alignment protrusions, such as grooves or through-holes and protrusions or pins protruding from the portions where they are provided. Other solutions are also possible which provide at least one protrusion and one indentation in each part of the receiving indentation 23 of the valve plate 20 and the mounting end portion 11 of the valve element 10.

  In the construction shown, the valve element 10 includes two alignment recesses 30 in the form of holes 17, for example through-holes provided symmetrically with the longitudinal axis of the valve element 10, each of which is a receiving recess in the valve plate 20, respectively. 23, incorporated into the valve plate 20 as a single piece, and fitted into an alignment projection 40 in the form of a pin 24 protruding from the bottom surface of the receiving recess 23.

  Independent of the structural form of each alignment protrusion 40, this is a valve in which a receiving recess 23 is defined which holds this alignment protrusion 40 so as not to interfere with the mounting of the valve plate 10 between the cylinder and the cylinder cover 8. It must have a calculated height that is at most equal to the height of the face of the plate 20.

  In the present invention, the mounting portion is fixed by being seated and fixed on the surface of the valve plate 20 that holds the valve element 10 in order to hold the mounting end portion 11 of the valve element 10 inside the receiving recess 23. Achieved by the first holding means and by the alignment protrusions 40 fitted in the respective alignment recesses 30.

  If the valve element 10 defines a discharge valve, this first retaining means is defined by a cylinder cover 8 seated and secured on the valve plate 20 and attaches the cylinder cover to the cylinder block by suitable means. In some constructions, the mounting structure further comprises at least one sealing gasket 9 between the cylinder cover 8 and the valve plate 20 portion and between the valve plate and the cylinder 1.

  If the valve element 10 defines a suction valve, this first holding means is defined by the top portion of the cylinder 1. In this case, in order to prevent the valve element from moving outwardly from the receiving recess 23 of the valve plate 10 before mounting the first holding means, the mounting structure includes the receiving recess 23 and the mounting end of the valve element 10. It is necessary to provide the second holding means between the part portion 11.

  In one method of practicing the present invention, the second holding means 50 maintains the mounting end portion 11 of the valve element 10 held in the respective receiving recess 21 of the valve plate 20 when mounting the valve. The liquid has a sufficient surface tension. This liquid can be, for example, a high viscosity liquid such as oil, and more specifically a type of lubricating oil used in cooling compressors.

  In another structural form of the invention, the second holding means 50 is an adhesive that maintains the mounting end portion 11 of the valve element 10 held in the respective receiving recess 23.

  According to the invention, a second holding means 50 is provided to receive the valve element 10 when mounting this part in the cylinder 1 so that the valve element 10 can at least temporarily exit the receiving recess 23. It acts to hold against the orthogonal displacement in the recess 23.

  In order to facilitate the correct mounting of the valve element 10 into the valve plate 20, the valve element 10 is provided with its mounting end portion 11, in particular with an eccentricity provided adjacent to the edge of this mounting end portion 11. Indexing means 18 is included.

  The fixing of the valve in the housing is achieved by a combined action of at least two of the following three factors. Activation of the alignment protrusion 40 in the alignment recess 30 (the valve element 10 is placed on the valve plate 20 and restricts the lateral and longitudinal movement of the valve element 10 relative to the receiving recess 23), Contour corresponding to the contour of the mounting end portion 11 and the adjacent contour of the receiving recess 23 (this contour helps to limit the lateral and longitudinal movement of the valve element 10), in the form of oil or glue. 2 Use of the holding means 50 (dosing and sticking in the region of the mounting end portion 11, for example, in the vicinity of the alignment projection 40, to adhere the valve element 10 inside the receiving recess 23, which valve element 10 is the receiving recess 23).

  According to the inventive concept disclosed herein, the mounting structure is moved into the receiving recess 23 of the valve element 10 by the action of at least two following parts until at least the first holding means is mounted. Guarantees fixing. Alignment projections 40 and respective alignment recesses 30, second holding means 50 and receiving recesses 23 (having a contour that resembles and surrounds the contours of the mounting end portions 11 for placing the mounting end portions in the receiving recesses 23).

  To the receiving recess 23 of the valve element 10 in a structure in which the receiving recess 23 does not have an enclosing outer shape similar to the outer shape of the mounting end portion 11 so that the mounting end portion is securely disposed in the receiving recess 23. Is secured by the action of each alignment protrusion 40 and each alignment recess 30 and by the second holding means 50 at least until the first holding means is mounted.

  The receiving recess 23 of the valve element 10 is provided under the condition that the receiving recess 23 has a structure similar to the outer shape of the mounting end portion 11 so that the mounting end portion is firmly disposed in the receiving recess 23. Securing to is ensured by providing one or both of the alignment protrusions 40 and the respective alignment recess 30 portions, and also providing the second holding means 50, at least until the first holding means is mounted. The

  The mounting structure of the present invention using the valve element 10 housed in a receiving recess 23 defined in the valve plate 20 consumes a small amount of raw material in the manufacture of the valve element 10 and adds to the surface of the substrate valve plate 20. Since machining operations are omitted, the cost is reduced compared to known prior art mounting structures. Furthermore, the mounting structure of the present invention simplifies the steps of defining the receiving recess 23 in the valve plate 20 achieved during its sintering, as well as fixing the valve element 10 in the receiving recess 23, which is a suction When it is a valve, there is no need for a fixing step by welding the valve element 10 to the valve plate. Providing the eccentric indexing means 18 in the valve element 10 allows the valve element 10 to be correctly mounted on the valve plate 20 in view of valve stacking and pretensioning.

  Although only one possible embodiment of the mounting structure of the present invention is shown herein, this is exemplary and limits the scope of the invention as defined in the claims appended hereto. It should be understood that it is not a thing.

FIG. 2 is a schematic plan view of a valve plate showing a suction orifice as seen from the side of a compression cylinder, made according to the prior art. FIG. 2 is a plan view schematically showing a single part suction valve as seen from the side of a compression cylinder and made according to the prior art. FIG. 6 is a perspective view schematically illustrating a valve plate and a valve element made in accordance with another prior art embodiment. Shown schematically from the side of the compression cylinder is a valve plate showing a suction orifice, a discharge orifice, a valve element, and a non-single-piece suction valve, respectively, in which the valve plate and the valve element are made according to the invention. It is a top view. 3b is a plan view in which the valve element of FIG. 3a is made in accordance with the present invention. 3a shows an enlarged cross-sectional view of the area where the valve plate is mounted between the top cylinder part and the head, with the mounting end part of the valve element seated on the valve plate for the valve plate valve element shown in FIG. is there. It is an enlarged view which shows the area | region where an edge part is mounted in the receiving hollow of a valve plate.

Claims (15)

  Internally it has one end closed by a valve plate (4, 20) with at least one suction orifice (5, 21) and at least one discharge orifice (6, 22), each of which has a valve plate (4 20), a mounting end portion (11) attached to the adjacent surface, a folding intermediate portion (12), and a sealed end portion operatively associated with each orifice on the valve plate (4, 20). A valve mounting structure for a cooling compressor of the kind having a cylinder (1) defining a compression chamber (3) selectively closed by a respective valve element (10) having (14) (20) a receiving recess (23) provided on top for receiving the mounting end portion (11) of the valve element (10), and a mounting end portion (11) of the valve element (10). First holding means (8, 9) seated and fixed on the adjacent surface of the valve plate (20) to hold the inside of the receiving recess (23), and the receiving recess (23 of the valve plate (20) ) And at least one alignment projection (30) which is held in at least one of the mounting end portion (11) portion of the valve element (10) and is fitted in a respective alignment recess (30) provided on the other of the portion. 40) and the mounting end of the receiving recess (23) and the valve element (10) to prevent the valve element from moving outwardly from the receiving recess (23) before mounting the first retaining means. And a second holding means (50) provided between the part portion (11) and the valve mounting structure.   Inside it has one end closed by a valve plate (4, 20) with a suction orifice (5, 21) and a discharge orifice (6, 22), each adjacent to the valve plate (4, 20). A mounting end portion (11) attached to the base plate, an intermediate bending portion (12), and a sealing end portion (14) to which each orifice is operatively attached on the valve plate (4, 20). A valve mounting structure for a cooling compressor of the type having a cylinder (1) defining a compression chamber (3) selectively closed by a respective valve element (10), which is provided on a valve plate (20) Of the mounting end portion (11) of the valve element (10) so as to accommodate the mounting end portion (11) and to be securely disposed in the receiving recess (23). A receiving recess (23) having an outer shape resembling a shape and said adjacent of the valve plate (20) to hold the mounting end portion (11) of the valve element (10) inside the receiving recess (23) At least one of the first holding means (8, 9) seated and fixed on the surface, the receiving recess (23) of the valve plate (20) and the mounting end portion (11) of the valve element (10) At least one of the portions of the at least one alignment protrusion (40) fitted in the respective alignment recess (30) provided by the other of the portions, and the valve element before mounting the first holding means A second retention provided between the receiving recess (23) and the mounting end portion (11) of the valve element (10) to prevent outward movement from the receiving recess (23) of the valve plate (20). Means (50 Characterized in that it comprises bets, the valve mounting structure.   The receiving recess (23) has an outer shape that surrounds the mounting end portion (11) so that the mounting end portion is firmly disposed in the receiving recess (23). The valve mounting structure according to claim 1.   4. The mounting end portion (11) is held against lateral displacement of the seating surface by an interference fit in the receiving recess (23) of the valve plate (20). The valve mounting structure described in 1.   The receiving recess (23) has the same profile as the respective valve element (10), said profile being adjacent to the valve element (10) in the part of the bent middle part (12) and the sealed end part (13). The valve mounting structure according to claim 1 or 2, wherein a minimum clearance from the outer shape is maintained.   An alignment protrusion (30) projects from the receiving recess (23) and is fitted into each alignment recess (40) provided in the mounting end portion (11) of the valve element (10) (at least one pin ( 24. The valve mounting structure according to claim 1 or 2, characterized in that it is defined by 24).   The valve element (10) is provided with at least one through hole (17) to receive an alignment protrusion (30) provided in a receiving recess (23) of the valve plate (20). Item 7. The valve mounting structure according to Item 6.   The second holding means (50) maintains the mounting end portion (11) of the valve element (10) held in the respective receiving recess (23) of the valve plate (20) during mounting of the valve. The valve mounting structure according to claim 1, wherein the valve mounting structure is a liquid having a sufficient surface tension.   9. The valve mounting structure according to claim 8, wherein the second holding means (50) is a liquid with high viscosity.   The valve mounting structure according to claim 9, wherein the liquid having a high viscosity is oil.   The valve mounting structure according to claim 10, wherein the oil is a lubricating oil.   The second holding means (50) maintains the mounting end portion (11) of the valve element (10) held in the respective receiving recess (23) of the valve plate (20) during mounting of the valve. The valve mounting structure according to claim 1, wherein the valve mounting structure is an adhesive.   3. Valve mounting structure according to claim 1 or 2, characterized in that the valve element (10) comprises eccentric indexing means (18) provided on its mounting end portion (11).   3. Valve mounting structure according to claim 1 or 2, characterized in that an eccentric indexing means (18) is provided adjacent to the edge of the mounting end portion (11).   The valve element (10) is a suction valve, the first holding means (8, 9) comprising a cylinder cover (8) seated against the top part of the cylinder (1) and the valve plate (10), The valve mounting structure according to claim 1 or 2.

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