Combination valve for micro piston type compressor

Abstract

The invention discloses a combination valve for a micro piston compressor, and aims to solve the problem of large axial size of a combination valve in the prior art. The device mainly comprises an air inlet hole plate, an air inlet valve plate, an air inlet spring, an air inlet side valve body, an air outlet valve plate, an air outlet spring, an air outlet side valve body and an air cylinder channel. According to the combined valve, the air inlet spring is ingeniously arranged in the air inlet and exhaust public flow channel, the axial space is greatly saved, the axial size and the overall size of the combined valve are greatly reduced, the combined valve is particularly suitable for the compact design of a miniature compressor, and the clearance volume in the air valve is naturally reduced through the compact structural design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combination valves, in particular to a combination valve for a micro piston compressor. BACKGROUND

[0002] The piston compressor is a key equipment in the industrial field, which realizes the compression and delivery of gas through the reciprocating movement of the piston in the cylinder. The gas valve (including the inlet valve and the exhaust valve) is the core component of the piston compressor, and its performance directly affects the efficiency, reliability and volume of the compressor.

[0003] For medium and high pressure piston compressors, the traditional gas valve usually adopts an independent inlet valve and exhaust valve structure, or although it adopts a combination valve form, but its overall volume is large, and the required installation space is also large. This structure layout limits the development of the compressor to miniaturization and compactness. Especially in the micro compressor application scene (such as portable devices, medical devices, precision instruments, etc.) with extremely harsh space requirements, the large volume of the traditional combination valve has become the main bottleneck of realizing the miniaturization of the whole machine.

[0004] Therefore, there is an urgent need in the art for a combination valve scheme that is compact in structure, small in clearance volume, and particularly suitable for micro medium and high pressure piston compressors. SUMMARY

[0005] The present application aims at the shortcomings of the prior art, and provides a combination valve for a micro piston compressor. By ingeniously arranging the inlet spring in the inlet and exhaust common flow channel, the axial space is greatly saved, the overall size of the combination valve is greatly reduced, and it is particularly suitable for the compact design of micro compressors.

[0006] The technical scheme adopted by the present application is as follows: A combination valve for a micro piston compressor, comprising: an inlet hole plate; an inlet valve plate arranged corresponding to the inlet hole plate for opening and closing the inlet hole plate; an inlet spring acting on the inlet valve plate to provide a pre-tightening force for closing the inlet hole plate; an inlet side valve body, which is internally provided with a common flow channel, which is communicated with the inlet passage during the inlet process and communicated with the exhaust passage during the exhaust process; an exhaust valve plate for opening and closing at least one exhaust hole; an exhaust spring acting on the exhaust valve plate to provide a pre-tightening force for closing the exhaust hole; an exhaust side valve body arranged on one side of the inlet side valve body; An exhaust passage is formed in the interior of the exhaust-side valve body; wherein the intake spring is arranged in the common flow channel.

[0007] Further, the end of the combined valve close to the exhaust side is the mounting end.

[0008] Further, the intake-side valve body is positioned by shaft shoulder mounting, so that the exhaust-side valve body can press the intake-side valve body, and the exhaust-side valve body is axially pressed by external fastening device.

[0009] Further, the intake hole plate and the circumferential mounting end face thereof adopt interference fit, and a sealing member is arranged between the circumferential mounting end face of the intake-side valve body and the circumferential mounting end face thereof.

[0010] Further, the end of the combined valve close to the intake side is the mounting end.

[0011] Further, an intake spring seat is further arranged between the intake-side valve body and the exhaust-side valve body, the interior of the intake spring seat is the common flow channel, and the intake spring seat is provided with a through hole leading to the exhaust.

[0012] Further, the external end face of the intake-side valve body is further provided with a connecting pipe, and a metal sealing member is further arranged between the connecting pipe and the intake-side valve body.

[0013] The beneficial effects of the present application relative to the prior art are as follows: Compact structure and small volume: by ingeniously arranging the intake spring in the intake and exhaust common flow channel, the axial space is greatly saved, so that the overall size of the combined valve is greatly reduced, which is particularly suitable for the compact design of micro-compressor, and the compact structure design naturally reduces the clearance volume in the air valve. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the embodiment one of the present application; Figure 2 It is a structural schematic diagram of the embodiment two of the present application; Figure 3 It is a structural schematic diagram of the cylinder and the cylinder cover as independent components in the prior art.

[0015] Wherein: 1, intake hole plate; 2, intake valve piece; 3, intake spring; 4, intake-side valve body; 5, exhaust valve piece; 6, exhaust spring; 7, exhaust-side valve body; (8, 9) O-ring; 11, cylinder passage; 12, exhaust passage; 13, intake spring seat; 17, connecting pipe; 18, metal sealing member. DETAILED DESCRIPTION

[0016] The specific implementation manner of the present application will be described below in combination with the drawings.

[0017] This invention provides a combination valve for a miniature reciprocating compressor, comprising: Intake plate 1; The intake valve plate 2 is provided corresponding to the intake orifice plate 1 and is used to open and close the intake orifice plate 1. The intake spring 3 acts on the intake valve plate 2, providing a preload force that tends to close the intake orifice plate 1; The intake side valve body 4 has a common flow channel inside, which is connected to the intake passage during the intake process and to the exhaust passage 12 during the exhaust process. Exhaust valve plate 5, used to open or close at least one exhaust port; The exhaust spring 6 acts on the exhaust valve plate 5, providing a preload force that tends to close the exhaust port; The exhaust-side valve body 7 is disposed on one side of the intake-side valve body 4; Exhaust passage 12 is formed inside the exhaust side valve body 7; The intake spring 3 is disposed within the common flow channel.

[0018] In one embodiment of the present invention, the end of the combination valve near the exhaust side is the mounting end.

[0019] In one embodiment of the present invention, the intake side valve body 4 is positioned by a shoulder mounting, so that the exhaust side valve body 7 can press against the intake side valve body 4, and the exhaust side valve body is axially pressed by an external fastening device.

[0020] In one embodiment of the present invention, the intake plate 1 and its circumferential mounting end face are interference fit, and a sealing element is provided between the intake side valve body 4 and its circumferential mounting end face, including but not limited to O-rings.

[0021] In one embodiment of the present invention, the end of the combination valve near the air intake side is the mounting end.

[0022] In one embodiment of the present invention, an intake spring seat 13 is further provided between the intake side valve body 4 and the exhaust side valve body 7. The interior of the intake spring seat 13 is a common flow channel, and the intake spring seat 13 is provided with a through hole leading to the exhaust.

[0023] In one embodiment of the present invention, a connecting pipe 17 is further provided on the outer end face of the intake side valve body 4, and a metal sealing element 18 is further provided between the connecting pipe 17 and the intake side valve body 4.

[0024] Example 1: like Figure 1 As shown in the figure, this embodiment provides a combined valve for a miniature piston compressor. The structural feature of this combined valve is that it is installed on the exhaust side, i.e., on the right side of the figure.

[0025] Specifically, the combined valve comprises Figure 1 an intake hole plate 1, an intake valve plate 2, an intake spring 3, an intake side valve body 4, an exhaust valve plate 5, an exhaust spring 6, and an exhaust side valve body 7. Hole one is connected to an intake pipeline, and holes five and six are connected to an exhaust pipeline. The flow channel in the intake side valve body 4 is a common flow channel for intake and exhaust.

[0026] Intake process principle: when the air pressure in the cylinder is lower than the intake pressure and the pressure difference ΔP1 is sufficient to overcome the pressure of the intake spring 3, the intake valve plate 2 is pushed away from the intake hole plate 1 under the action of the pressure difference, the intake passage is opened, and the air flow passes through hole one, hole two, and hole three, and enters the cylinder.

[0027] Intake end principle: when the pressure difference ΔP1 is reduced to be insufficient to overcome the pressure of the intake spring 3, the intake spring 3 presses the intake valve plate 2 back onto the intake hole plate 1, the intake valve plate 2 covers hole one, the intake passage is closed, and the intake ends at this time.

[0028] Exhaust process principle: when the air pressure in the cylinder is higher than the exhaust pressure and the pressure difference ΔP2 is sufficient to overcome the pressure of the exhaust spring 6, the exhaust valve plate 5 is pushed away from the intake side valve body 4, the exhaust passage is opened, and the air flow passes through hole three, hole four, hole five, and hole six, and is discharged into the exhaust pipeline. Exhaust end principle: when ΔP2 is insufficient to overcome the pressure of the exhaust spring 6, the exhaust valve plate 5 is pushed towards the intake side valve body 4, the exhaust valve plate 5 covers hole four, the exhaust passage is closed, and the exhaust ends at this time. Then, the air pressure in the cylinder continuously decreases under the action of the piston, when the air pressure in the cylinder is lower than the intake pressure and the pressure difference ΔP1 is sufficient to overcome the pressure of the intake spring 3, the intake starts again, and the cycle continues.

[0029] It should be noted that the air valve of the embodiment is installed in one hole from one side, the intake hole plate 1 is in interference fit with the installation end face, there is a seal between the intake side valve body 4 and the installation end face (to reduce the leakage of high-pressure gas into the cylinder during intake), the intake side valve body 4 is installed and positioned by a shaft shoulder, so that the exhaust side valve body 7 can press the intake side valve body 4, and other pressing devices are used to fix the exhaust side valve body 7.

[0030] Embodiment two: As shown in Figure 2 , the embodiment provides a combined valve for a micro-piston compressor, and the structural feature of the combined valve is an installation mode on the intake side, i.e., the left side in the figure.

[0031] Specifically, the combined valve of the structure comprises an intake hole plate 1, an intake valve plate 2, an intake spring 3, an intake side valve body 4, an exhaust valve plate 5, an exhaust spring 6, an exhaust side valve body 7, O-rings (8 and 9), a cylinder passage 11, an exhaust passage 12, an intake spring seat, a connecting pipe 17, and a metal sealing element 18.

[0032] Intake process principle: when the intake valve 2 seals the intake hole plate 1 under the action of the intake spring 3, the exhaust valve 5 seals the exhaust hole on the intake spring seat 13 under the action of the exhaust spring 6, and the cylinder is connected with the space where the intake spring 3 is located through a hole.

[0033] Intake end principle: when the gas pressure in the cylinder is lower than the intake pressure and the pressure difference ΔP1 is sufficient to overcome the pressure of the intake spring 3, the intake valve 2 is pushed away from the intake hole plate 1 under the action of the pressure difference, the intake passage is opened, and the gas flow enters the cylinder from the intake passage; when the pressure difference ΔP1 is reduced to be insufficient to overcome the pressure of the intake spring 3, the intake spring 3 presses the intake valve 2 back to the intake hole plate 1, and the intake ends.

[0034] Exhaust process principle: when the gas pressure in the cylinder is higher than the exhaust pressure and the pressure difference ΔP2 is sufficient to overcome the pressure of the exhaust spring 6, the exhaust valve 5 is pushed away from the intake spring seat 13, the exhaust passage is opened, and the gas flow is discharged into the exhaust passage 12 through the exhaust port; Exhaust end principle: when ΔP2 is insufficient to overcome the pressure of the exhaust spring 6, the exhaust valve 5 is pushed to the intake spring seat 13, the exhaust passage 12 is closed, and the exhaust ends. Then the gas pressure in the cylinder is continuously reduced under the action of the piston, and when the gas pressure in the cylinder is lower than the intake pressure and the pressure difference ΔP1 is sufficient to overcome the pressure of the intake spring 3, the intake starts again, and the cycle continues.

[0035] In particular, the intake side valve body 4 and the exhaust side valve body 7 are circumferentially sealed by O-rings 8 and 9 respectively; the intake end face of the intake side valve body 4 is also connected with a connecting pipe 17, and the combination of the two is sealed by a metal sealing element 18; the inside of the connecting pipe 17 is an intake passage, which significantly increases the intake passage compared with the first embodiment, and reduces the intake pressure loss through the hierarchical structure and each node sealing.

[0036] It should be further pointed out that, as shown in Figure 3 The cylinder and the cylinder head of the prior art are two independent components, and the gas valve is installed in the cylinder head. The disadvantages of this structure design mainly manifest in that the overall size is relatively large. The cylinder head structure of the present application is integrated with the cylinder body, and the gas valve is installed in the cylinder body. This structure itself greatly reduces the external size. The intake spring 3 of the present application is ingeniously arranged in the intake and exhaust common flow channel, which greatly saves the axial space, and the overall size of the combined valve is further greatly reduced, which is particularly suitable for the compact design of the micro-compressor. The compact structure design naturally reduces the clearance volume inside the gas valve.

[0037] The above description is an explanation of the present application, not a limitation of the application. The scope of the present application is defined in the claims, and any form of modification within the protection scope of the present application can be made.

Claims

1. A combination valve for a micro-piston compressor, characterized by, The utility model relates to a combined valve, which comprises: An intake hole plate (1); An intake valve plate (2) corresponding to the intake hole plate, used for opening and closing the intake hole plate; An intake spring (3) acting on the intake valve plate (2) to provide a pre-tightening force for closing the intake hole plate (1); An intake side valve body (4) with a common flow channel inside, which is communicated with an intake passage during the intake process and an exhaust passage (12) during the exhaust process; An exhaust valve plate (5) used for opening and closing at least one exhaust hole; An exhaust spring (6) acting on the exhaust valve plate (5) to provide a pre-tightening force for closing the exhaust hole; An exhaust side valve body (7) arranged on one side of the intake side valve body (4); An exhaust passage (12) formed inside the exhaust side valve body (7); The intake spring (3) is arranged in the common flow channel.

2. The combination valve of claim 1, wherein: The end of the combined valve close to the exhaust side is the mounting end.

3. The combination valve of claim 2, wherein: The intake side valve body (4) is positioned by shaft shoulder mounting, so that the exhaust side valve body (7) can press the intake side valve body (4), and the exhaust side valve body (7) is axially pressed by external fastening devices.

4. The combination valve of claim 2, wherein: The intake hole plate (1) and the circumferential mounting end face thereof adopt stepped positioning and interference fit, and a sealing element is arranged between the intake side valve body (4) and the circumferential mounting end face thereof.

5. The combination valve of claim 1, wherein: The end of the combined valve close to the intake side is the mounting end.

6. The combination valve of claim 5, wherein: An intake spring seat (13) is further arranged between the intake side valve body (4) and the exhaust side valve body (7), the inside of the intake spring seat (13) is the common flow channel, and the intake spring seat (13) is provided with a through hole (4) leading to the exhaust side.

7. The combination valve of claim 5, wherein: The external end face of the intake side valve body (4) is further provided with a connecting pipe (17), and a metal sealing element (18) is further arranged between the connecting pipe and the intake side valve body.

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