A noise-reducing compressor cylinder head

Abstract

This utility model discloses a noise-reducing compressor cylinder head, including a cylinder head and a spring. An exhaust valve plate is fixedly connected to one side of the outer surface of the cylinder head; the spring is movably connected to the cylinder head. Through the arrangement of the cylinder head, spring, and exhaust valve plate, this noise-reducing compressor cylinder head, during use, when the compressor begins to exhaust, the high-pressure air column instantaneously impacts the valve plate. This thrust is converted into an axial compression pulse on the spring, causing the spring to uniformly contract along the threaded sleeve of the lift hole towards the gasket. The resulting restoring force shows a gradual upward trend, which both attenuates the valve plate's opening energy and weakens the peak inertial force at the final impact moment. Simultaneously, the gasket on the inner surface of the cylinder head, with its elastic material, first absorbs the remaining shock wave and provides secondary buffering, isolating the rigid striking surface between metals, further reducing the exhaust valve plate's closing impact sound to a low-noise operating range. This effectively slows down the speed at which the exhaust valve plate strikes the exhaust lift, maintaining a good noise reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of refrigerator compressor technology, and in particular to a noise-reducing compressor cylinder head. Background Technology

[0002] The compressor cylinder head is the core pressure-bearing component of a reciprocating compressor. Traditionally, it is mostly cast as a whole in gray cast iron, and the layout of the water chamber, air passage and valve hole is completed by multiple cutting. First, it evenly transmits the piston explosion pressure and maintains high cycle fatigue strength. Second, it integrates the intake and exhaust valve groups to ensure the minimum clearance volume. Third, it forms a cooling water jacket to suppress thermal stress. With the increasing demand for high pressure and lightweight, the industry has tried to use vermicular graphite cast iron, high-strength aluminum alloy and even fiber reinforced composite materials, and with the help of topology optimization and additive manufacturing.

[0003] Existing compressor cylinder heads do not have the function of effectively reducing noise through buffer valve plates. Due to the high temperature during operation, the metal hardness decreases, and the valve plates are more prone to plastic deformation. Impact micro-vibration causes the surface grooves to deepen, the actual working clearance increases, and the large temperature difference between day and night causes the valve plate to have inconsistent fit clearance with the lift surface, which disrupts the initial fit. At night, when the temperature is low, the valve return is delayed, making it more likely to have continuous secondary impacts. The noise changes from a single pulse to superimposed pulses, and the subjective loudness increases. Utility Model Content

[0004] The main objective of this invention is to provide a noise-reducing compressor cylinder head, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A noise-reducing compressor cylinder head includes a cylinder head and a spring. An exhaust valve plate is fixedly connected to one side of the outer surface of the cylinder head. The spring is movably connected to the cylinder head, and the bottom of the spring is installed in a hole in the cylinder head for exhaust lift.

[0006] In order to achieve the purpose of absorbing kinetic energy, the spring coefficient of the cylinder head of the noise-reducing compressor of this utility model needs to be matched and calculated according to parameters such as compressor exhaust pressure and exhaust valve weight.

[0007] In order to reduce noise, a gasket is provided on one side of the inner surface of the cylinder head of the present invention as a noise-reducing compressor cylinder head, and the gasket is sandwiched between the exhaust valve plate and the cylinder head.

[0008] In order to provide a fixing function, a fixing screw is provided on one side of the outer surface of the cylinder head of the noise-reducing compressor of this utility model.

[0009] To provide support, a retaining ring is provided at one end of the spring in this noise-reducing compressor cylinder head.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. In this utility model, through the arrangement of the cylinder head, spring, and exhaust valve plate, when the compressor starts to exhaust, the high-pressure air column instantly impacts the valve plate. This thrust is converted into an axial compression pulse on the spring, causing the spring to contract evenly along the threaded sleeve of the lift hole towards the gasket. The resulting restoring force shows a gradual upward trend, which both attenuates the valve plate's opening energy and weakens the peak inertial force at the moment of its final impact. At the same time, the gasket on the inner surface of the cylinder head absorbs the remaining shock wave with its elastic material and provides secondary buffering, isolating the rigid striking surface between the metals, further reducing the closing striking sound of the exhaust valve plate to a low-noise operating range. This effectively slows down the speed at which the exhaust valve plate strikes the exhaust lift, maintaining a good noise reduction effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the retaining ring structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the spring structure according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the cylinder head structure according to an embodiment of the present utility model.

[0012] In the diagram: 1. Cylinder head; 2. Spring; 3. Exhaust valve plate; 4. Gasket; 5. Fixing screw; 6. Retaining ring. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example 1 like Figure 1-4 As shown, a noise-reducing compressor cylinder head includes a cylinder head 1 and a spring 2, with an exhaust valve plate 3 fixedly connected to one side of the outer surface of the cylinder head 1. In this embodiment, the spring 2 is movably connected to the cylinder head 1, and the bottom of the spring 2 is installed in the exhaust lift hole of the cylinder head 1.

[0015] In practical use, when the compressor is working and discharging, the exhaust airflow pushes the exhaust valve 3 to open. At this time, the spring 2 is compressed by the exhaust valve 3 and undergoes elastic deformation. The elastic force of the spring 2 provides a reverse damping force to the exhaust valve 3, slowing down the opening speed of the exhaust valve 3 and preventing it from rapidly impacting the exhaust stroke, thus reducing the exhaust knocking sound. When the refrigerant is compressed in the cylinder bore, the pressure gradually increases. At this time, the suction valve closes because the cylinder pressure is higher than the suction side pressure, preventing the refrigerant from flowing back into the evaporator. The exhaust valve 3 closes because the cylinder pressure has not yet exceeded the exhaust pressure. The cylinder remains closed due to side pressure, creating a closed space inside the cylinder. The refrigerant is continuously compressed to high pressure. During the exhaust phase, when the cylinder pressure rises above the exhaust side pressure, the exhaust valve plate 3, being an elastic thin sheet, is pushed open. The high-pressure refrigerant enters the condenser through the exhaust pipe, completing the exhaust process. The exhaust valve plate 3 only opens when the cylinder pressure is higher than the exhaust side pressure; otherwise, it closes to prevent high-pressure refrigerant from flowing back into the cylinder bore. The cylinder head 1 guides the refrigerant to flow into the cylinder bore through the intake passage during intake and out through the exhaust passage during exhaust, isolating the high and low pressure areas on the intake and exhaust sides to prevent cross-contamination.

[0016] In this embodiment, the spring coefficient of spring 2 needs to be calculated based on parameters such as compressor exhaust pressure and exhaust valve plate 3.

[0017] In practical use, the stiffness of spring 2 must ensure that the exhaust valve plate 3 can open smoothly under the action of exhaust pressure, and also effectively buffer the impact when the exhaust valve plate 3 falls back, reduce noise and prevent damage. When selecting the elastic coefficient, it is necessary to ensure that the maximum reaction force of spring 2 does not affect the normal opening and closing of the valve plate, and also to ensure that its deformation is sufficient to absorb the energy generated by the movement of the valve plate, so as to achieve a balance between flexible opening and closing and buffering and noise reduction.

[0018] In this embodiment, a gasket 4 is provided on one side of the inner surface of the cylinder head 1, and the gasket 4 is sandwiched between the exhaust valve plate 3 and the cylinder head 1.

[0019] In practical use, the elastic material of the gasket 4 absorbs the impact energy of the exhaust valve plate 3 when it strikes, reducing the noise generated by direct metal-to-metal collision.

[0020] In this embodiment, a fixing screw 5 is provided on one side of the outer surface of the cylinder head 1.

[0021] In practical use, the fixing screw 5 passes through the through hole on the wall thickness of the cylinder head 1 and forms a rigid mechanical connection with the gasket 4 inside the cylinder head 1 and the corresponding threaded hole. After tightening, the gasket 4 will be compressed and fixed in position between the exhaust valve plate 3 and the cylinder head 1.

[0022] In this embodiment, a retaining ring 6 is provided at one end of the spring 2.

[0023] In practical use, the retaining ring 6 forms a rigidity in the axial direction, blocking the end of the spring 2 and giving it a reverse support point, so that the spring 2 always maintains the predetermined working length and compression preload. At the same time, the retaining ring 6 can be quickly snapped in or pried out during disassembly and assembly, which simply and reliably solves the contradiction of both compressibility within the spring 2 cavity and prevention of overall pop-out.

[0024] Working principle: During operation, when the compressor is working and venting, the exhaust airflow pushes the exhaust valve plate 3 to open. At this time, the spring 2 is squeezed by the exhaust valve plate 3 and undergoes elastic deformation. The elastic force of the spring 2 provides a reverse damping force for the exhaust valve plate 3, slowing down the opening speed of the exhaust valve plate 3 and preventing it from rapidly impacting the exhaust lift, thus reducing the exhaust slapping sound. The elastic material of the gasket 4 absorbs the impact energy of the exhaust valve plate 3 during slapping, reducing the noise generated by direct metal collision. The fixing screw 5 passes through the through hole on the wall thickness of the cylinder head 1 and forms a rigid mechanical connection with the gasket 4 and the exhaust valve plate 3 inside the cylinder head 1 and the corresponding threaded hole. After tightening, the gasket 4 will be compressed and form a reliable pre-compression load between the exhaust valve plate 3 and the cylinder head 1. The retaining ring 6 forms a rigidity in the axial direction, blocking the end of the spring 2 and giving it a reverse support point, so that the spring 2 always maintains the predetermined working length and compression preload. At the same time, the retaining ring 6 can be quickly snapped in or pried out during disassembly and assembly. This solves the contradiction of both compressibility within the spring 2 cavity and prevention of overall ejection in a simple and reliable way, thus achieving noise reduction.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A noise-reducing compressor cylinder head, comprising a cylinder head (1) and a spring (2), characterized in that: An exhaust valve plate (3) is fixedly connected to one side of the outer surface of the cylinder head (1); the spring (2) is movably connected to the cylinder head (1), and the bottom of the spring (2) is installed in the exhaust lift hole of the cylinder head (1).

2. The noise reducing compressor cylinder head of claim 1, wherein: The elastic coefficient of the spring (2) needs to be calculated based on parameters such as the compressor exhaust pressure and the weight of the exhaust valve plate (3).

3. The noise reducing compressor cylinder head of claim 1, wherein: A gasket (4) is provided on one side of the inner surface of the cylinder head (1), and the gasket (4) is sandwiched between the exhaust valve plate (3) and the cylinder head (1).

4. The noise reducing compressor cylinder head of claim 1, wherein: A fixing screw (5) is provided on one side of the outer surface of the cylinder head (1).

5. The noise reducing compressor cylinder head of claim 1, wherein: A retaining ring (6) is provided at one end of the spring (2).

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