CN115045820A

CN115045820A - Deflection-preventing structure of compressor exhaust valve

Info

Publication number: CN115045820A
Application number: CN202210423866.8A
Authority: CN
Inventors: 武守飞; 王宗槐; 张勤建
Original assignee: Jiaxipera Compressor Co Ltd
Current assignee: Jiaxipera Compressor Co Ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-09-13

Abstract

The invention discloses an anti-deflection structure of a compressor exhaust valve, which comprises a crankcase provided with a cylinder hole, wherein an exhaust valve assembly is arranged on the crankcase, the exhaust valve assembly comprises a valve plate covering the cylinder hole, an exhaust passage communicated with the cylinder hole is arranged on the valve plate, a reed is covered at the outlet of the exhaust passage, and the tail part of the reed is provided with a pressing part connected with the valve plate; by redesigning the arrangement mode of the reed in the exhaust valve component, the included angle between the connecting line between the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed is adjusted, the force arm of the deflection torque is shortened, and the deflection torque caused by the uneven flow field of the exhaust valve is reduced or even eliminated.

Description

Deflection-preventing structure of compressor exhaust valve

Technical Field

The invention relates to the technical field of compressor manufacturing, in particular to an anti-deflection structure of a compressor exhaust valve.

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.

Deflection of the exhaust valve due to incompressibility of the exhaust valve root is considered to be 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 flow of air 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 current solution is to increase the pressing force as much as possible to prevent the exhaust valve from deflecting, such as riveting the exhaust valve root, 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

Aiming at the problem that the exhaust valve plate bears the deflection torque during the working process to cause fatigue failure in the background technology, the invention provides the deflection preventing structure of the compressor exhaust valve.

In order to achieve the purpose, the invention adopts the following technical scheme:

the deflection preventing structure of the exhaust valve of the compressor comprises a crankcase provided with a cylinder hole, wherein an exhaust valve assembly is arranged on the crankcase, the exhaust valve assembly comprises a valve plate covering the cylinder hole, an exhaust passage communicated with the cylinder hole is arranged on the valve plate, a reed is arranged at the outlet of the exhaust passage in a covering manner, and a compressing part connected with the valve plate is arranged at the tail part of the reed;

wherein, the deflecting moment M borne by the reed is (F1-F2) h, F1 is the air flow pressure of the reed close to the center side of the cylinder hole, F2 is the air flow pressure of the reed far away from the center side of the cylinder hole, and h is the distance from the deflecting resultant force formed by F1 and F2 to the center of the pressing part; wherein h ═ L × Sin α; wherein, L is the distance between the center of the reed and the center of the pressing part; alpha is the included angle between the connecting line of the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed; wherein alpha is less than or equal to 30 degrees. Starting from the generation reason of the deflection moment, the tongue used for shielding the outlet of the exhaust passage is found to bear the opposite pressures of F1 and F2 respectively, the exhaust passage is not designed at the center of the cylinder generally, so that the airflow in the exhaust passage is not uniform in flow, so that a resultant force is formed by F1 and F2, the resultant force is the deflection force capable of generating the deflection moment, the deflection force exists along with the working process of the crankcase and has an indefinite value, and the deflection moment can be controlled by changing the moment arm corresponding to the deflection force; the force arm size is changed by changing the included angle between the connecting line between the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed, so that the deflection torque is reduced, the working reliability of the exhaust valve is effectively improved, and the influence of the deflection torque on the service life of the exhaust valve is avoided.

Preferably, a line connecting the center of the cylinder bore and the center of the exhaust passage coincides with the geometric symmetry axis of the reed, and α is 0 °. When the connecting line between the center of the cylinder hole and the center of the exhaust channel coincides with the geometric symmetry axis of the reed, the force arm is zero, so that the deflection torque caused by non-uniform flow field is completely eliminated, the stress concentration caused by deflection is avoided, and the service life of the exhaust valve is prolonged

Furthermore, the exhaust valve assembly comprises a limiting plate, the limiting plate is used for pressing and fixing the pressing part on the outer side of the valve plate, and the reed is attached to cover the outlet of the exhaust passage. The limiting plate is used for limiting the lift of the reed, and the limiting plate is fixedly installed on the valve plate and used for locking the position of the pressing portion.

Preferably, the reed comprises a sealing part and an elastic plate part, the sealing part is connected with the pressing part through the elastic plate part, and the diameter of the sealing part is larger than that of the outlet of the exhaust passage. The elastic plate part is bent to open the air valve for exhausting when the sealing part is impacted by a flow field, and the sealing part is used for ensuring that the exhaust channel is completely closed when the air is not exhausted, so that the sealing performance of the air cylinder is ensured.

Preferably, a joint of the pressing portion and the elastic plate portion is provided with a reinforcing rib, and the valve plate is provided with a yielding groove corresponding to the reinforcing rib. The reinforcing ribs are used for reducing stress concentration at the bent part of the reed and reducing the possibility of fatigue failure of the reed, and the abdicating grooves are used for ensuring that the reed keeps closed to the exhaust passage after resetting and cannot generate gaps due to interference of the reinforcing ribs.

Further, the reinforcing ribs are arranged along the width direction of the tongue.

Preferably, the reinforcing rib is connected with the pressing part and the elastic plate part in a smooth transition mode on two sides respectively.

The reinforcing ribs are used for reinforcing the joint position of the elastic plate part and the pressing part, the anti-fatigue capability of the reed is ensured in the frequent bending process of the reed, and the elastic plate part and the pressing part are connected in a smooth transition mode, so that the fatigue fracture caused by stress concentration at the joint is avoided.

Therefore, the invention has the following beneficial effects: (1) the arrangement mode of the reed in the exhaust valve component is redesigned, and the included angle between the connecting line between the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed is adjusted, so that the moment arm of the deflection torque is shortened, and the deflection torque of the exhaust valve caused by the non-uniform flow field is reduced or even eliminated; (2) the reinforcing ribs are used for reinforcing the joint position of the elastic plate part and the pressing part, the anti-fatigue capability of the reed is ensured in the frequent bending process, and the elastic plate part and the pressing part are connected in a smooth transition mode, so that the fatigue fracture caused by stress concentration at the joint is avoided.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of a prior art vent valve assembly arrangement.

Fig. 3 is a schematic diagram showing the arrangement of the exhaust valve assembly in embodiment 1.

Fig. 4 is a schematic diagram showing the arrangement of the exhaust valve assembly in embodiment 2.

In the figure: 100 crankcase, 101 cylinder hole, 200 piston, 1 valve plate, 11 exhaust passage, 12 abdicating groove, 2 reed, 21 sealing part, 22 elastic plate part, 3 compressing part, 4 limiting plate, 5 reinforcing rib, 6 cylinder hole center-exhaust passage center connecting line and 7 reed geometric symmetry axis.

Detailed Description

The invention is further described with reference to the following detailed description and accompanying drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Example 1

As shown in fig. 2, the deflection preventing structure of the exhaust valve of the compressor comprises a crankcase 100 provided with a cylinder hole 101, wherein an exhaust valve assembly is arranged on the crankcase 100, the exhaust valve assembly comprises a valve plate 1 covering the cylinder hole 101, an exhaust passage 11 communicated with the cylinder hole 101 is arranged on the valve plate 1, an outlet of the exhaust passage 11 is covered and provided with a tongue 2, and a pressing part 3 connected with the valve plate 1 is arranged at the tail part of the tongue 2; wherein, the deflecting moment M borne by the reed 2 is (F1-F2) × h, F1 is the airflow pressure of the reed 2 near the center of the cylinder bore, F2 is the airflow pressure of the reed 2 far from the center of the cylinder bore, and h is the distance from the deflecting resultant force formed by F1 and F2 to the center of the pressing part 3; wherein h ═ L × Sin α; wherein, L is the distance between the center of the reed 2 and the center of the pressing part 3; alpha is the included angle between the connecting line 6 between the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed 2; as shown in fig. 3, in the present embodiment, α is 30 °. Starting from the generation reason of the deflection moment, in the scheme, the reed 2 for shielding the outlet of the exhaust passage 11 respectively bears the opposite pressures of F1 and F2, and the exhaust passage 11 is not generally designed at the center position of the cylinder, so that the airflow in the exhaust passage is not uniform, and therefore, F1 and F2 form a resultant force, namely the deflection force capable of generating the deflection moment, the resultant force exists along with the working process of the crankcase 100 and has an indefinite value, and the deflection moment can be controlled by changing the moment arm corresponding to the deflection force; wherein the exhaust velocity near the center side of the cylinder is V1; the exhaust velocity away from the center side of the cylinder is V2, which are different in magnitude. This application changes the arm of force size through the contained angle that changes the geometric symmetry axis 7 of line 6 at cylinder hole center-exhaust passage center and reed to cut down deflection moment, in this embodiment, alpha is 30, and h is L2, and consequently deflection moment is only half of former moment, effectively promotes discharge valve's operational reliability, avoids deflection moment to influence discharge valve's life.

As shown in fig. 1, the exhaust valve assembly includes a limiting plate 4, the limiting plate 4 fixes the compressing portion 3 to the outer side of the valve plate 1 in a press fit manner, and the tongue 2 covers the outlet of the exhaust passage in a fitting manner. The reed 2 comprises a sealing part 21 and a spring plate part 22, the sealing part 21 is connected with the pressing part 3 through the spring plate part 22, and the diameter of the sealing part 21 is larger than that of an outlet of the exhaust passage. The limiting plate 4 is used for limiting the lift of the reed 2, and the limiting plate 4 is fixedly arranged on the valve plate 1 and used for locking the position of the pressing part 3. The elastic plate part 22 bends to open the valve for exhausting when the sealing part 21 is impacted by a flow field, and the sealing part 21 is used for ensuring that the exhaust channel is completely closed when the exhaust channel is not exhausted, so that the sealing performance of the cylinder is ensured.

The joint of the pressing part 3 and the elastic plate part 22 is provided with a reinforcing rib 5, and the valve plate 1 is provided with a abdicating groove 12 corresponding to the reinforcing rib 5. The reinforcing ribs 5 are arranged along the width direction of the tongue 2. The two sides of the reinforcing rib 5 are in smooth transition and are respectively connected with the pressing part 3 and the elastic plate part 22.

The reinforcing ribs 5 are used for reducing stress concentration at the bent part of the tongue 2 and reducing the possibility of fatigue failure of the tongue 2, and the abdicating grooves 12 are used for ensuring that the tongue 2 keeps closed on an exhaust passage after being reset, so that gaps can not occur due to interference of the reinforcing ribs 5. The reinforcing ribs 5 are used for reinforcing the joint position of the elastic plate part 22 and the pressing part 3, the anti-fatigue capability of the reed 2 is ensured in the frequent bending process, and the elastic plate part 22 and the pressing part 3 are connected in a smooth transition mode, so that the fatigue fracture caused by stress concentration at the joint is avoided.

Example 2

As shown in fig. 4, unlike embodiment 1, a line 6 connecting the cylinder bore center to the exhaust passage center coincides with the geometric symmetry axis of the tongue 2, and α is 0 °. When a connecting line 6 between the center of the cylinder hole and the center of the exhaust channel is superposed with a geometric symmetry axis 7 of the reed, h is L, Sin0 is 0, and M is (F1-F2) L, Sin0 is 0, so that the deflection torque caused by non-uniform flow fields is completely eliminated, the stress concentration caused by deflection is avoided, and the service life of the exhaust valve is prolonged. The structure is simple, and the technical effect is easy to realize; low cost and good effect.

In addition to the above embodiments, the technical features of the present invention can be re-selected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention which are not described in detail should be regarded as the specific embodiments of the present invention and are within the protection scope of the present invention.

Claims

1. The deflection preventing structure of the exhaust valve of the compressor comprises a crankcase provided with a cylinder hole, wherein an exhaust valve assembly is arranged on the crankcase, and the deflection preventing structure is characterized in that the exhaust valve assembly comprises a valve plate covering the cylinder hole, an exhaust passage communicated with the cylinder hole is arranged on the valve plate, a reed is arranged at the outlet of the exhaust passage in a covering manner, and a compressing part connected with the valve plate is arranged at the tail part of the reed;

wherein, the deflecting moment M borne by the reed is (F1-F2) × h, F1 is the air flow pressure of the reed close to the center side of the cylinder hole, F2 is the air flow pressure of the reed far away from the center side of the cylinder hole, and h is the distance from the deflecting resultant force formed by F1 and F2 to the center of the pressing part; wherein h ═ L × Sin α;

wherein, L is the distance between the center of the reed and the center of the pressing part; alpha is the included angle between the connecting line of the center of the cylinder hole and the center of the exhaust channel and the geometric symmetry axis of the reed; wherein alpha is less than or equal to 30 degrees.

2. The anti-deflection structure of the exhaust valve of the compressor, according to claim 1, wherein the connecting line between the cylinder bore center and the center of the exhaust passage coincides with the geometric symmetry axis of the reed, and α is 0 °.

3. The structure of claim 1, wherein the exhaust valve assembly comprises a limiting plate, the limiting plate fixes the compressing portion to the outer side of the valve plate in a press fit manner, and the tongue covers the outlet of the exhaust passage in a fit manner.

4. The structure of any one of claims 1 to 3, wherein the reed comprises a sealing portion and a spring portion, the sealing portion and the pressing portion are connected by the spring portion, and the diameter of the sealing portion is larger than the outlet diameter of the discharge passage.

5. The structure of claim 4, wherein a joint of the compressing portion and the elastic plate portion is provided with a reinforcing rib, and the valve plate is provided with a relief groove corresponding to the reinforcing rib.

6. The structure of claim 4, wherein the reinforcing rib is formed along the width direction of the tongue.

7. The structure of claim 4, wherein the reinforcing rib is connected to the compressing portion and the elastic plate portion in a smooth transition manner at two sides thereof.