CN217682183U - Anti-deflection structure of exhaust valve of compressor - Google Patents

Abstract

The utility model discloses a compressor discharge valve prevents structure that deflects, including crankcase, valve plate and discharge valve, be equipped with the cylinder hole in the crankcase, the valve plate corresponds the cylinder hole setting in crankcase one end, be equipped with on the valve plate with the exhaust passage of cylinder hole eccentric settings, exhaust passage and cylinder hole UNICOM, a serial communication port, discharge valve include the tongue and compress tightly the portion, the tongue lid is on exhaust passage, compress tightly a fixed mounting on the valve plate, the tongue is the axisymmetric structure, the line one-tenth contained angle B of the geometric symmetry axis of tongue and cylinder center to exhaust passage geometric center, contained angle B is not more than 30 degrees. The utility model has the advantages that the deflection torque of the exhaust valve caused by uneven flow field can be reduced or even eliminated; preventing the exhaust valve from deflecting and thus improving the reliability of the exhaust valve. The structure is simple and easy to realize; low cost and good effect.

Description

Anti-deflection structure of exhaust valve of compressor

Technical Field

The application relates to compressor discharge valve technical field especially relates to a compressor discharge valve prevents deflection structure.

Background

The existing refrigerator or freezer adopts a reciprocating compressor to refrigerate; the reciprocating compressor discharges high-pressure gas to a condenser of the box body through an exhaust valve under the driving of power. The exhaust valve of the compressor generally adopts a reed structure. Namely one end is fixed; the other end of the cover which is free is arranged on the vent passage port and can be freely opened and closed under the action of pressure difference. As a precise core part of the compressor, the exhaust valve bears alternating impact load; root bending fatigue failure and head slap fatigue failure often occur. How to improve the reliability of the exhaust valve is always the technical key for the development of the compressor industry.

Exhaust valve deflection due to incompressibility of the exhaust valve root is considered a critical contributor to exhaust valve failure. Because the exhaust passage is not generally designed at the center of the cylinder, the airflow in the exhaust passage is not uniform; the uneven air flow may subject the exhaust valve to a yawing moment. If the exhaust valve root is not fully compressed, the exhaust valve will deflect around the root; stress concentration and fatigue failure in a short time are easily generated after deflection. The existing solution is to increase the pressing force as much as possible to prevent the exhaust valve from deflecting, such as riveting the root of the exhaust valve, welding and the like; while effective, it requires a rigorous design and assembly process to control exhaust valve root compression, is costly, and does not completely eliminate exhaust valve deflection.

In addition, chinese patent publication No. CN205001155U, published as 2016, 01, 27, entitled "an exhaust valve plate deflection preventing structure of a refrigerator compressor", discloses an exhaust valve plate deflection preventing structure of a refrigerator compressor, which includes an exhaust valve plate, a valve plate, and a stopper; the exhaust valve plate is of an asymmetric structure, and the rigidity of two sides of the exhaust valve plate is different. During assembly, one side with high rigidity of the exhaust valve plate is arranged at a position close to the center of the cylinder, so that the opening difficulty of the side is increased, and the exhaust valve plate is prevented from deflecting in the opening process. This constructive solution is not designed from the point of view of reducing or eliminating the yawing moment, and still does not solve the problem.

Disclosure of Invention

Based on the above defects in the prior art, the utility model provides a deflection-preventing structure for the exhaust valve of the compressor, which can reduce or even eliminate the deflection torque of the exhaust valve caused by the non-uniform flow field; preventing the exhaust valve from deflecting and thus improving the reliability of the exhaust valve. The structure is simple and easy to realize; low cost and good effect.

In order to achieve the above object, the present invention adopts the following technical solutions.

The utility model provides a compressor discharge valve prevents deflection structure, which comprises a crankcase, valve plate and discharge valve, be equipped with the cylinder hole in the crankcase, the valve plate corresponds the cylinder hole setting in crankcase one end, be equipped with on the valve plate with the eccentric exhaust passage who sets up in cylinder hole, exhaust passage and cylinder hole UNICOM, a serial communication port, discharge valve includes the tongue and compresses tightly the portion, the tongue lid is on exhaust passage, compress tightly a fixed mounting on the valve plate, the tongue is the axisymmetric structure, the line of the geometric symmetry axis of tongue and cylinder center to exhaust passage geometric center becomes an contained angle B, contained angle B is not more than 30 degrees. The deflection moment M actually suffered by the valve plate is (F1-F2) L SinB, wherein F1-the valve plate close to the center side of the cylinder is stressed, and F2-the valve plate far away from the center side of the cylinder is stressed; l is the distance from the center of the reed to the center of the pressing part; h-distance of the resultant deflection force to the center of the nip. Therefore, the position relation between the geometric symmetry axis of the reed of the exhaust valve and the connecting line from the center of the cylinder to the geometric center of the exhaust channel is set; the deflection torque caused by uneven flow field can be reduced or even eliminated; the exhaust valve is prevented from deflecting, so that the reliability of the exhaust valve is improved; the side of the exhaust valve reed with strong circulation capacity can be matched with the side of the exhaust channel with large airflow. The exhaust flow loss is reduced, and the efficiency of the compressor is improved; the structure is simple and easy to realize; low cost and good effect.

Preferably, the included angle B is not greater than 15 degrees. The included angle B is further limited, and the effect of reducing the deflection moment is better.

Preferably, the geometric symmetry axis of the reed of the exhaust valve coincides with the line connecting the center of the cylinder to the geometric center of the exhaust passage. At the moment, the included angle B is 0, so that the deflection moment caused by the non-uniform flow field can be eliminated; the exhaust valve is prevented from deflecting to thereby improve the reliability of the exhaust valve.

Preferably, the reed is of a flat plate structure. The elasticity is uniform and stable, and the reliability of the exhaust valve is ensured.

Preferably, the tongue includes a link portion connected to the pressing portion and a circular plate portion located at an outer end of the link portion, a transition arc is provided between the circular plate portion and the link portion, and the circular plate portion and the link portion are located on the same plane and have equal thicknesses. The circular plate part corresponds to the exhaust channel, and the circular plate part with smooth edges cannot bear edge deflection force during exhaust, so that the deflection prevention capability of the exhaust valve is ensured.

Preferably, the pressing part is in a cuboid shape, the pressing part is installed on the valve plate, and an exhaust valve seat sealing surface is arranged on the valve plate corresponding to the outer end of the exhaust channel. The pressing part of the cuboid structure has a large mounting surface, the pressing part and the valve plate are rectangular in binding surface, and the rectangle has certain positioning capacity, so that the exhaust valve is further prevented from deflecting.

Preferably, the exhaust valve is provided with a stopper, the stopper comprises a first stopper part fixedly connected with the pressing part and a second stopper part obliquely arranged outwards from the first stopper part, and the second stopper part corresponds to the reed in position. The first spacing portion and the portion that compresses tightly of stopper cooperate together to fix on the valve plate, improve the reliability that the portion that compresses tightly installed on the valve plate, and the lift of discharge valve reed can be restricted to the spacing portion of second, guarantees discharge valve's reliability, prevents that the reed from overturning excessively, prolongs the life of reed.

The utility model discloses following beneficial effect has: the deflection torque of the exhaust valve caused by non-uniform flow field can be reduced or even eliminated; the exhaust valve is prevented from deflecting to thereby improve the reliability of the exhaust valve. The structure is simple and easy to realize; low cost and good effect.

Drawings

FIG. 1 is a schematic diagram of a prior art exhaust valve passage in relation to cylinder position;

FIG. 2 is a schematic cross-sectional view of a conventional exhaust valve through the center of a cylinder-center exhaust passage;

FIG. 3 is a schematic illustration of a prior art exhaust valve deflection torque;

FIG. 4 is a schematic view of a first exhaust valve anti-deflection structure of the present invention;

FIG. 5 is a schematic view of a second exhaust valve anti-deflection structure of the present invention;

FIG. 6 is a schematic cross-sectional view illustrating a first deflection preventing structure of the discharge valve according to the present invention;

fig. 7 is a structural schematic of the exhaust valve of the present invention.

The names in the above figures are as follows:

1-a crankcase; 11-cylinder bores; 12-line from cylinder center to geometric center of exhaust channel; 2-a piston; 3-a valve plate; 31-an exhaust channel; 32-exhaust valve seat sealing surface; 4-an exhaust valve; 41-tongue; 410-a link portion; 411-a disc portion; 42-a compression section; 43-axis of geometric symmetry of the reed; 5-a stopper; 51-a first stop; 52-a second stop; f1, stressing a valve plate close to the center side of the cylinder, and F2, stressing a valve plate far away from the center side of the cylinder; v1-exhaust velocity near the center side of the cylinder; v2-exhaust velocity away from the center side of the cylinder; l is the distance from the center of the reed to the center of the pressing part; h-the distance from the resultant deflection force to the center of the pressing part; a and B-are included angles between geometric symmetry axes of the reed and a connecting line from the center of the cylinder hole to the center of the exhaust channel, and A is larger than B.

Detailed Description

The invention is further illustrated with reference to the accompanying drawings and specific embodiments.

In the case of the example 1, the following examples are given,

as shown in fig. 4 to 7, the deflection preventing structure of the exhaust valve of the compressor comprises a crankcase 1, a valve plate 3 and the exhaust valve 4, wherein a cylinder hole 11 is arranged in the crankcase 1, and a piston 2 is arranged in the cylinder hole 11 in a sliding manner. The piston 2 is reciprocated in the cylinder bore 11 by external power. The valve plate 3 corresponds cylinder hole 11 setting in crankcase 1 one end, be equipped with the exhaust passage 31 with cylinder hole 11 eccentric settings on the valve plate 3, exhaust passage 31 and cylinder hole 11 UNICOM, the pneumatic valve includes tongue 41 and compresses tightly portion 42, tongue 41 covers on exhaust passage 31, compress tightly portion 42 fixed mounting on valve plate 3, tongue 41 is the axisymmetric structure, the cylinder center is 11 centers for the cylinder hole, the geometrical symmetry axis 43 of tongue and the cylinder of discharge valve 4 center to the line 12 coincidence of exhaust passage 31 geometrical center. The tongue 41 has a flat plate structure. The tongue 41 includes a link portion 410 connected to the pressing portion 42 and a circular plate portion 411 located at an outer end of the link portion 410, a transition arc is provided between the circular plate portion 411 and the link portion 410, and the circular plate portion 411 and the link portion 410 are located on the same plane and have equal thickness. The pressing part 42 is shaped like a cuboid, the pressing part 42 is installed on the valve plate 3, and the outer end of the valve plate 3 corresponding to the exhaust channel 31 is provided with an exhaust valve seat sealing surface 32. The exhaust valve seat sealing surface 32 is provided with a sealing ring for sealing when contacting with the exhaust valve 4. The exhaust valve 4 is provided with a stopper 5, the stopper 5 comprises a first stopper part 51 fixedly connected with the pressing part 42 and a second stopper part 52 obliquely arranged outwards from the first stopper part 51, and the second stopper part 52 corresponds to the reed 41.

With this embodiment the deflection moment M = (F1-F2) = L Sin0=0 of the valve plate can be calculated. In the formula: f1, the valve plate close to the center side of the cylinder is stressed, and F2, the valve plate far away from the center side of the cylinder is stressed; the distance from the center of the L-shaped tongue 41 to the center of the pressing part 42; h-the distance of the resultant deflection force to the center of the pinched portion 42.

In the case of the example 2, the following examples are given,

referring to fig. 5, the difference between the embodiment 2 and the embodiment 1 is that the geometric symmetry axis of the tongue 41 forms an angle B with the line 12 from the center of the cylinder to the geometric center of the exhaust passage 31, and the angle B is 14 degrees. The exhaust valve 4 is then subjected to a lower deflection torque M = (F1-F2) × L × SinB. In the formula: f1, the valve plate close to the center side of the cylinder is stressed, and F2, the valve plate far away from the center side of the cylinder is stressed; the distance from the center of the L-shaped tongue 41 to the center of the pressing part 42; h-the distance of the resultant deflection force to the center of the pinched portion 42.

As shown in fig. 1 to 3, in the prior art, the axis of the reed 41 forms an angle a with the line 12 from the center of the cylinder to the geometric center of the exhaust passage 31, the angle a is larger than the angle B, and the exhaust valve 4 is subjected to a deflecting moment M1 of (F1-F2) × h, i.e., (F1-F2) × L SinA, which is larger than the deflecting moment at the angle B. The position relation between the geometric symmetry axis 43 of the reed of the exhaust valve 4 and the connecting line from the center of the cylinder to the geometric center of the exhaust channel 31 is set; the deflection torque caused by uneven flow field can be reduced or even eliminated; preventing the exhaust valve 4 from deflecting and thus improving the reliability of the exhaust valve 4; the side of the exhaust valve 4 where the reed 41 has a strong flow capacity can be matched with the side of the exhaust passage 31 where the air flow is large. The exhaust flow loss is reduced, and the efficiency of the compressor is improved; the structure is simple and easy to realize; low cost and good effect.

Claims (7)

1. The utility model provides a compressor discharge valve prevents deflection structure, including the crankcase, valve plate and discharge valve, be equipped with the cylinder hole in the crankcase, the valve plate corresponds the cylinder hole setting in crankcase one end, be equipped with on the valve plate with the exhaust passage of cylinder hole eccentric settings, exhaust passage and cylinder hole UNICOM, a serial communication port, discharge valve includes the tongue and compresses tightly the portion, the tongue lid is on exhaust passage, compress tightly a fixed mounting on the valve plate, the tongue is the axisymmetric structure, the line of the geometric symmetry axis of tongue and cylinder center to exhaust passage geometric center becomes an contained angle B, contained angle B is not more than 30 degrees.

2. The compressor discharge valve anti-deflection structure as claimed in claim 1, wherein said included angle B is not greater than 15 degrees.

3. The compressor discharge valve anti-deflection structure as claimed in claim 1 or 2, wherein the geometric symmetry axis of the reed of the discharge valve coincides with the line connecting the center of the cylinder to the geometric center of the discharge passage.

4. The compressor discharge valve anti-deflection structure as claimed in claim 1, wherein said reed is a flat plate structure.

5. The structure of claim 1 or 4, wherein the tongue comprises a connecting rod portion connected to the pressing portion and a circular plate portion located at an outer end of the connecting rod portion, a transition arc is provided between the circular plate portion and the connecting rod portion, and the circular plate portion and the connecting rod portion are located on the same plane and have the same thickness.

6. The structure of claim 1, wherein the pressing portion is formed in a rectangular parallelepiped shape, and the pressing portion is mounted on the valve plate, and the valve plate is provided with a sealing surface of the discharge valve seat corresponding to the outer end of the discharge passage.

7. The structure of claim 1 or 6, wherein the discharge valve is provided with a stopper, the stopper comprises a first stopper portion fixedly connected to the compressing portion and a second stopper portion inclined outwardly from the first stopper portion, and the second stopper portion corresponds to the position of the tongue.

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