JPH02161182A - Suction valve mechanism for compressor - Google Patents

Abstract

PURPOSE:To prevent the generation of abnormal noise due to the suction pulsation by forming the main and subsuction holes at the position corresponding to each cylinder bore of a valve plate and constituting a suction valve for opening and closing each suction hole in the state where the top edge of a subsuction valve formed integrally with a main suction valve extends in the opposite direction. CONSTITUTION:As for the compressor such as swash plate type compressor, main and subintake holes 14 and 15 are formed at the position corresponding to each cylinder bore of a valve plate 4 joined with the edge surface of a cylinder block 3. A valve plate 16 which is formed by press-molding a steel plate member is interposed between the cylinder block 3 and the valve plate 4, and a suction valve 19 having the main and subsuction valves 17 and 18 at the position corresponding to the intake holes 14 and 15 is formed on the valve plate 16. In this case, the subsuction valve 18 is formed integrally in the main suction valve 17 so that the top edge extends in the opposite direction to the top edge of the main suction valve 17. Further, the engaging recessed parts 20 and 21 for regulating the unnecessary deflection of the respective suction valves 17, and 18 are formed at the edge part on the valve plate 16 side of the cylinder block 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suction valve mechanism for a compressor that performs compression by reciprocating movement of a piston.

[Prior Art] This type of compressor, for example, a swash plate compressor, as shown in FIG. A housing 5 is connected and fixed via the plate 4 with bolts (not shown). A suction hole 8 and a discharge hole 9 are formed in the valve plate 4 to communicate a suction chamber 6 and a discharge chamber 7 formed in the housing 5 with the cylinder bore 2, respectively, and the suction hole 8 is opened and closed on the cylinder block 3 side. A suction valve 10 for opening and closing the discharge hole 9 is provided on the discharge chamber 7 side, and a discharge valve 11 for opening and closing the discharge hole 9 is provided. In order to prevent the suction valve 10 and the discharge valve 11 from bending toward the opening side more than necessary, a retainer 12 is provided on the back side of the discharge valve 11, and the tip of the suction valve 10 is provided at the end of the cylinder bore 2. A locking recess 13 for locking is formed.

[Problems to be Solved by the Invention] However, in the conventional configuration, when the drive shaft rotates at low speed, the suction valve 10 suffers from self-vibration during the period from when its tip begins to open until it comes into contact with the locking recess 13. This has the disadvantage of causing suction pulsation, which causes the evaporator to vibrate and generate abnormal noise. Although this inconvenience can be solved by reducing the depth of the locking recess 13, there arises a problem that this causes suction resistance, resulting in a decrease in suction performance and a decrease in cooling efficiency.

Further, the conventional suction valve 10 has a valve plate 4 at its tip end.
Because of the structure in which the suction hole 8 is opened by bending away from the suction valve 10, the suction valve 10 is not parallel to the end surface of the suction hole 8 when opened, and there is also the problem that suction resistance increases during high-speed rotation. .

The present invention has been made in view of the above problems, and includes:
The purpose is to provide a suction valve mechanism for a compressor that can reduce abnormal noise caused by suction pulsation during low-speed rotation and reduce suction resistance during high-speed rotation.

[Means for Solving the Problem] In order to achieve the above object, in the present invention, a suction hole and a discharge hole are formed in the end face of a cylinder block in which a cylinder bore in which a piston is slidably accommodated is formed. A housing forming a suction chamber and a discharge chamber is joined and fixed via a valve plate, and a suction valve for opening and closing the suction hole is provided on the cylinder block side of the valve plate.
In a pressure W4 machine in which a discharge valve that opens and closes the discharge hole is provided on the discharge chamber side and compression is performed by reciprocating movement of a piston, a main suction hole and a sub-suction hole are formed at positions corresponding to each cylinder bore of the valve plate. The auxiliary suction valve that opens and closes the auxiliary suction hole is formed integrally with the main suction valve that opens and closes the main suction hole, and its tip extends in the opposite direction to the tip of the main suction valve, and the auxiliary suction valve that opens and closes the auxiliary suction hole is formed so that its tip extends in the opposite direction to the tip of the main suction valve. A locking recess is provided at the end to engage with the tips of the main and sub-side suction valves to restrict unnecessary deflection of each suction valve toward the opening side.

[Function] With the above-described configuration, in the present invention, when the pressure in the compression chamber formed in the cylinder bore becomes lower than the pressure in the suction chamber, the auxiliary suction valve starts to open first, and then the main suction valve starts to open. Before the tip of the main suction valve comes into contact with the locking recess, the tip of the sub-suction valve comes into contact with the locking plate, and at this point, automatic vibration of the entire suction valve is suppressed. Therefore, the main suction valve moves to the maximum open position where its tip abuts the locking recess, with almost no automatic vibration, and suction pulsation is prevented from occurring. In addition, since force is applied to the suction valve at multiple locations in the main suction hole and the 1st suction hole, the suction valve is placed parallel to the end surface of the suction hole when opened, reducing suction resistance during high-speed rotation. do.

Example 1] Hereinafter, an example that does not embody the present invention will be described with reference to FIGS. 1 to 3. The device of this embodiment differs from the conventional device only in the suction valve mechanism, and the configuration of other parts is the same, and the same parts are given the same reference numerals and explanations will be omitted.

A main suction hole 14 and a sub suction hole 15 are formed in the valve plate 4 at positions corresponding to each cylinder bore 2 .

Between the cylinder block 3 and the valve plate 4, there is a
A valve plate 16 is inserted, which is press-molded from a plate material made of
6 are arranged at positions corresponding to the main suction hole 14 and the sub suction hole 15, respectively, and the main suction hole 14 and the sub suction hole 15
A suction valve 19 is formed of a main suction valve 17 and a sub suction valve 18 that open and close. The auxiliary suction valve 18 is the main suction valve 17
The main suction valve 17 is formed integrally with the main intake valve 17 so that its tip extends in the opposite direction to the tip of the main suction valve 17 .

The main suction valve 17 and the auxiliary suction valve 18 are formed such that their tips reach outside the inner peripheral surface of the cylinder bore 2.

On the other hand, at the end of the cylinder block 3 on the side of the valve plate 16, the main intake valve 17 and the auxiliary intake valve 18 are bent into the cylinder bore 2 at positions corresponding to the tips of the main intake valve 17 and the auxiliary intake valve 18. Stopping recesses 20 and 21 are formed to allow this and to engage with the tips of each suction valve 17, 18 to restrict unnecessary deflection.

The depth of the locking recess 21 that engages with the sub-intake valve 18 is shallower than the depth of the stop portion 20 that engages with the main intake valve 17.

Next, the operation of the suction valve mechanism configured as described above will be explained.

During operation of the compressor, when the pressure in the compression chamber 22 becomes lower than the pressure in the suction chamber 6 during the suction stroke in which the piston 1 moves from the top dead center to the bottom dead center, the refrigerant gas in the suction chamber 6 The suction valve 19 is sucked into the compression chamber 22 while being bent toward the compression chamber 22 (cylinder bore 2) against its elasticity. At this time, first the sub-intake valve 18 is bent and its tip is locked in the locking recess 21, and then the main suction valve 17 is also bent together with the sub-intake valve 18, and its tip is locked in the locking recess 20. The opening operation of the suction valve 19 is completed.

Automatic vibration of the entire suction valve 19 is suppressed from the time when the tip of the sub-suction valve 17 is locked in the locking recess 21, and the generation of suction pulsation due to automatic vibration and the generation of abnormal noise accompanying it are suppressed. In addition, since the suction valve 19 receives force from two places, the main suction hole 14 and the sub suction hole 15 located near the tip and the base, the main suction valve 17 and the sub suction valve 18 that make up the suction valve 19 also receive force. Each receives force from two locations: the proximal end side and the distal end side. Therefore, the main suction valve 17 and the auxiliary suction valve 18 are moved to the positions where they engage with the locking recesses 20 and 21 in a short time, making it easier to suppress the suction pulsation caused by the self-wJ vibration. Conventionally, the rotation speed was 75 OrD11
However, in this example, no abnormal noise occurred up to 500 rDIm.

In addition, the thickness of the suction valve necessary to ensure the strength to withstand the pressure inside the cylinder bore that acts on the suction valve during the compression stroke increases as the cross-sectional area of the suction hole, that is, the diameter thereof, increases.
The rigidity of the valve plate increases accordingly, making it difficult for the suction valve to bend. In this solid line example, the suction holes are the main suction hole 14 and the sub suction hole 1.
5, the diameter of each plate inlet hole 14 and 15 becomes smaller when securing the same cross-sectional area as the conventional suction hole, and the thickness of the valve plate 16 is reduced accordingly (3 times smaller than the conventional one). 2), the rigidity of the main suction valve 17 and the auxiliary suction valve 18 decreases, and both suction valves 17 and 18 become susceptible to bending. Therefore, in addition to receiving force from two places on the proximal end side and the distal end side, the main suction valve 17 and the sub-suction valve 18 are in the open state relative to the end faces of the main suction hole 14 and the sub-suction hole 15, respectively. Since they are arranged in parallel, suction resistance is reduced and performance (volume efficiency, suction performance) at high speed rotation is improved.

Note that the present invention is not limited to the above embodiments,
For example, as shown in FIG. 4, the sub-intake valve 18 may be formed to have a narrow width at its base end.

In this case, the bending rigidity of the sub-intake valve 18 is weakened, and when the sub-intake valve 18 is opened, the tip of the sub-intake valve 18 comes into contact with the four locking parts 21 more quickly, and suction pulsation is further suppressed. Also, each cylinder bore 2
Applicable to swash plate type compressors and wobble type compressors in which the number of main suction holes 14 formed at positions corresponding to You may.

[Effects of the Invention] As described in detail above, according to the present invention, while in the past, abnormal noise was generated due to suction pulsation when the rotation speed of the drive shaft decreased to 750 rpm, the rotation speed decreased to 500 rpm. r
No abnormal noise occurs until pn. In addition, since the suction hole is divided into a plurality of parts, if the sum of the cross-sectional areas of each suction hole is the same as the cross-sectional area of the conventional suction hole, the thickness of the suction valve can be reduced, and the valve can be easily bent. , combined with the fact that forces are applied to the suction valve at multiple locations in the main suction hole and the sub suction hole,
When open, the main suction valve and the sub-suction valve that make up the suction valve are arranged parallel to the end surfaces of the main suction hole and the sub-suction hole, respectively, reducing suction resistance especially at high speed rotation and improving volumetric efficiency and suction. Performance is improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment embodying the present invention, in which FIG. 1 is a sectional view taken along line A-A in FIG. 2, and FIG. 2 is a sectional view taken along line BB in FIG. 1. Fig. 3 is a sectional view of the main part showing the open state of the suction valve, Fig. 4 is a sectional view of the main part of a modified example, Fig. 5 is a partially cutaway side view of the conventional device, and Fig. 6 is the same as the suction valve. FIG. 3 is a diagram showing the relationship between the cylinder bore and the cylinder bore. Piston 1, cylinder bore 2, cylinder groove 3, pulp plate 4, housing 5, suction chamber 6, discharge chamber 7,
Main suction hole 14, auxiliary suction hole 15, main suction valve 17, auxiliary suction valve 18, suction valve 19, locking recess 20.21° Patent applicant: Toyota Industries Ltd., patent attorney Hironobu Onda Figure 6

Claims (1)

[Claims] 1. A housing forming a suction chamber and a discharge chamber is bonded and fixed to an end face of a cylinder block in which a cylinder bore in which a piston is slidably reciprocated is formed, through a valve plate in which a suction hole and a discharge hole are formed. In a compressor that performs compression by reciprocating movement of a piston, a suction valve that opens and closes the suction hole is provided on the cylinder block side of the valve plate, and a discharge valve that opens and closes the discharge hole is provided on the discharge chamber side. A main suction hole and a sub-suction hole are formed at positions corresponding to the cylinder bore, and the sub-suction valve that opens and closes the sub-suction hole is integrated with the main suction valve that opens and closes the main suction hole, and its tip is the tip of the main suction valve. A locking recess is formed to extend in the opposite direction to the valve plate side end of each cylinder bore and engages with the tips of both the main and auxiliary intake valves to restrict unnecessary deflection of each intake valve toward the opening side. A compressor suction valve mechanism equipped with