Gap seal coupling seam type gas bearing of linear compressor

Abstract

The utility model provides a clearance seal coupling seam type gas bearing of a linear compressor, which comprises a cylinder body internally provided with a cavity and a piston movably arranged in the cavity of the cylinder body, the cavity is divided into a compression cavity and a backpressure cavity by the piston, a high-pressure cavity is arranged in the piston and is communicated with the compression cavity through a one-way valve, and the backpressure cavity is communicated with the compression cavity. A gap is arranged between the outer wall of the piston and the wall of the cavity of the cylinder body, and is characterized in that the middle of the piston is provided with a slit type throttler communicated with the high-pressure cavity and the gap, the two ends of the inner wall of the cylinder body are respectively provided with an exhaust ring groove, and the two ends of the piston are respectively provided with a radial hole opposite to the exhaust ring grooves and a first axial hole communicated with the radial hole and the compression cavity. And the second axial hole is communicated with the radial hole and the backpressure cavity, and the piston is electrically connected with the linear motor. The axial flow interference flowing in a bearing film is effectively reduced, the operation stability is improved, air hammer vibration is avoided, and gap sealing is formed at the two ends of the bearing.

Description

Technical Field

[0001] The utility model relates to a gas bearing, in particular to a linear compressor gap-sealed coupled slit-type gas bearing, belonging to the technical field of mechanical design and manufacturing. Background Art

[0002] Gas bearings refer to sliding bearings that use gas as a lubricating medium. Since gas has the characteristics of low viscosity, good viscosity-temperature characteristics, radiation resistance, and no pollution, gas bearings have excellent application prospects in special occasions such as high speed, high precision, low friction, low power consumption, high and low temperature, and radiation. Existing gas bearings are mainly small-hole throttling air-floating bearings, which use a traditional small-hole throttling structure and belong to point source gas supply. This point source gas supply type small-hole throttling structure has concave holes, which is easy to produce air hammer vibration, resulting in poor bearing stability. In addition, this gas bearing structure lacks exhaust grooves at both ends and centering hole design, which is easy to cause air film and block the airflow. Therefore, it is necessary to improve the existing technology. Summary of the invention

[0003] In order to solve the problems of poor stability or easy occurrence of gas film and blockage of air flow caused by the small hole throttling structure of the existing gas bearing, the utility model provides a linear compressor gap sealing coupling slit type gas bearing.

[0004] The utility model is completed through the following technical solutions: a linear compressor gap seal coupled seam type gas bearing, including a cylinder body with a cavity therein, a piston movably arranged in the cylinder body cavity, the cavity is divided into a compression chamber and a back pressure chamber by the piston, a high pressure chamber is arranged in the piston, the high pressure chamber is connected with the compression chamber through a one-way valve, a gap is arranged between the outer wall of the piston and the cylinder body cavity wall, characterized in that: a seam type throttle connecting the high pressure chamber and the gap is arranged in the middle of the piston, exhaust ring grooves are respectively arranged at both ends of the inner wall of the cylinder body, radial holes opposite to the exhaust ring grooves are respectively arranged at both ends of the piston, a first axial hole connecting the radial hole and the compression chamber, and a second axial hole connecting the radial hole and the back pressure chamber, the piston is electrically connected to the linear motor When the linear motor drives the piston to move to the left, the gas pressure in the compression chamber increases until the pressure is greater than the gas pressure in the high-pressure chamber, and then enters the high-pressure chamber through the one-way valve, is throttled and depressurized by the slot throttle, enters the gap to form a gas film, and then further expands and depressurizes through the gap and flows into the exhaust ring groove respectively, and then flows through the corresponding radial hole, the first axial hole and the second axial hole respectively to the corresponding compression chamber and back pressure chamber, so that the piston is suspended in the cylinder cavity and moves frictionlessly in the cylinder body to complete gas lubrication until the piston completes a reciprocating motion, which can effectively prevent blockage and form a gap seal at both ends of the piston, thereby improving the running stability of the bearing and avoiding air hammer vibration.

[0005] The cylinder body is set as a cylinder, the shape of the cavity is adapted to the cylinder, and the piston is set as a cylinder with an outer diameter smaller than the cavity, so that the piston can reciprocate in the cylinder body cavity.

[0006] The slot throttle comprises: a plurality of slots arranged at intervals on the piston wall and connecting the high-pressure chamber and the gap, the plurality of slots being arranged symmetrically or asymmetrically, the outer end of each slot being connected to the gap, and the inner end being connected to the high-pressure chamber, so that the gas in the high-pressure chamber is guided to the gap through the plurality of slots to form an air film, so that the axial flow interference of the air film between the cylinder body and the piston is minimized, and at the same time, the scattering effect of the air film flow is also minimized, thereby solving the problem of poor stability of the air-floating bearing.

[0007] The utility model has the following advantages and effects: by adopting the above scheme, the gas in the high-pressure chamber enters the gap between the piston and the cylinder body after throttling and reducing the pressure through the slit-type throttling mechanism, thereby forming an air film, and the air film further expands and reduces the pressure from the gap and flows into multiple exhaust grooves, and then flows out from the return holes at both ends of the piston respectively, which can effectively reduce the axial flow interference of the flow in the bearing film, improve the running stability of the bearing, avoid the occurrence of air hammer vibration, and at the same time form a gap seal at both ends of the bearing, so as to achieve the purpose of stable air supply to the gas bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a cross-sectional view of the utility model;

[0009] Figure 2 for Figure 1 AA view of the . DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0011] The utility model provides a linear compressor gap-sealed coupled slit-type gas bearing, comprising a cylinder body 1 with a cavity therein, a piston 5 movably arranged in the cavity of the cylinder body 1, the cavity is divided into a compression chamber 2 and a back pressure chamber 11 by the piston 5, a high pressure chamber 8 is arranged in the piston 5, the high pressure chamber 8 is communicated with the compression chamber 11 through a one-way valve 4, a gap 9 is arranged between the outer wall of the piston 5 and the cavity wall of the cylinder body 1, wherein: a slit-type throttle 10 communicating the high pressure chamber 8 with the gap 9 is arranged in the middle of the piston 5, exhaust ring grooves 13 are respectively arranged at both ends of the inner wall of the cylinder body 1, radial holes 7 opposite to the exhaust ring grooves 13 are respectively arranged at both ends of the piston 5, a first axial hole 6 communicating the radial hole 7 with the compression chamber 2, and a second axial hole 12 communicating the radial hole 7 with the back pressure chamber 2, the piston 5 is electrically connected to the linear motor When the linear motor drives the piston 5 to move to the left, the gas pressure in the compression chamber 2 increases until the gas pressure is greater than the pressure in the high-pressure chamber 8, and then enters the high-pressure chamber 8 through the one-way valve 4, and enters the gap 9 after throttling and reducing the pressure through the slot throttle 10 to form a gas film, and then further expands and reduces the pressure through the gap 9 and flows into the exhaust ring groove 13 respectively, and then flows through the corresponding radial hole 7, the first axial hole 6 and the second axial hole 12 respectively to the corresponding compression chamber 11 and the back pressure chamber 11, so that the piston 5 is suspended in the cavity of the cylinder body 1, and moves frictionlessly in the cavity of the cylinder body 1, completing gas lubrication, until the piston completes a reciprocating motion, which can effectively prevent blockage, and at the same time form a gap seal at both ends of the piston, improve the running stability of the bearing, and avoid air hammer vibration;

[0012] The cylinder body 1 is set as a cylinder, the shape of the cavity is adapted to the cylinder, and the piston 5 is set as a cylinder with an outer diameter smaller than the cavity, so that the piston 5 can reciprocate in the cavity of the cylinder body 1;

[0013] The slit throttle 10 includes: four slits 14 arranged at intervals on the wall of the piston 5 and connecting the high-pressure chamber 8 and the gap 9. The four slits 14 are symmetrically arranged. The outer end of each slit 14 is connected to the gap 9, and the inner end is connected to the high-pressure chamber 8, so that the gas in the high-pressure chamber 8 is guided to the gap 9 through the slit 14 to form an air film, so that the axial flow interference of the air film between the cylinder body 1 and the piston 5 is minimized, and the scattering effect of the air film flow is also minimized, thereby solving the problem of poor stability of the air bearing.

[0014] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0015] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A linear compressor gap-sealed coupled seam-type gas bearing, comprising a cylinder with a cavity therein, a piston movably arranged in the cylinder cavity, the cavity is divided into a compression cavity and a back pressure cavity by the piston, a high pressure cavity is arranged in the piston, the high pressure cavity is connected to the compression cavity through a one-way valve, a gap is arranged between the outer wall of the piston and the wall of the cylinder cavity, and the characteristics are: A slit-type throttle connecting the high-pressure chamber and the gap is provided in the middle of the piston, exhaust ring grooves are provided at both ends of the inner wall of the cylinder body, radial holes opposite to the exhaust ring grooves are provided at both ends of the piston, a first axial hole connecting the radial hole and the compression chamber, and a second axial hole connecting the radial hole and the back pressure chamber are provided, and the piston is electrically connected to the linear motor.

2. The linear compressor gap seal coupled seam type gas bearing according to claim 1, characterized in that The cylinder body is set as a cylinder, the shape of the cavity is adapted to the cylinder, and the piston is set as a cylinder with an outer diameter smaller than the cavity.

3. The linear compressor gap seal coupled seam type gas bearing according to claim 1, characterized in that The slot type throttle comprises: a plurality of slots arranged at intervals on the piston wall and connecting the high pressure chamber and the gap, the plurality of slots are arranged symmetrically or asymmetrically, the outer end of each slot is connected to the gap, and the inner end is connected to the high pressure chamber.

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