Compressor with pressure balancing structure

Abstract

The utility model discloses a compressor with a pressure balance structure, which comprises a casing and a screw unit arranged in a compression chamber of the casing, the screw unit comprises a rotating shaft and a spiral part sleeved on the rotating shaft, the tail end of the spiral part and the compression chamber form an isolation chamber, the casing is provided with a pressure relief channel for communicating the isolation chamber with the outside, and the pressure relief channel is communicated with the pressure balance structure. The switch component is arranged on the pressure relief channel; the switch component comprises a blocking shaft, and the blocking shaft has an opening motion state in which the blocking shaft moves by a set distance under the action of external force to open the pressure relief channel and a closing motion state in which the blocking shaft elastically moves and resets after pressure is removed. The pressure relief channel for communicating the isolation chamber with the outside is arranged on the machine shell, the switch component is arranged on the pressure relief channel, and the blocking shaft is driven to move by utilizing the difference value between the acting force of the reset spring and the pressure in the isolation chamber, so that the discharge amount of lubricating oil in the isolation chamber is automatically controlled; the pressure in the isolation chamber is maintained at a set value, so that the axial load of the rotating shaft and the bearing mechanism is balanced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of single-screw air compressors, in particular to a compressor with a pressure balance structure. Background Art

[0002] A screw air compressor (hereafter referred to as a compressor) is a device that compresses air into gas through the continuous motion of a rotor. During operation, low-pressure air enters the compressor's compression chamber through an air inlet. The rotating motion of the rotor compresses the air, increasing its temperature and pressure. Finally, the compressed, high-pressure gas is pushed out of the compressor and transported through pipelines to other equipment for use.

[0003] When the compressor is running, the lubricating oil used for lubrication and cooling will enter the compression chamber along with the air, and the lubricating oil will enter the isolation chamber under the action of high-pressure air. However, when the pressure in the isolation chamber is too high, it will not only be detrimental to the compression of the air, but also increase the axial load on the rotating shaft and bearings, thereby reducing the service life of the rotating shaft and bearings. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the utility model provides a compressor with a pressure balance structure, which can automatically control the discharge amount of lubricating oil in the isolation chamber to maintain the pressure in the isolation chamber at a set value, reduce the axial load borne by the rotating shaft and bearing mechanism, and extend the service life.

[0005] The technical solution adopted by the present invention to solve its technical problems is: to provide a compressor with a pressure balance structure, including a casing and a screw unit arranged in a compression chamber of the casing, the screw unit including a rotating shaft coaxially arranged with the compression chamber, and a spiral portion sleeved on the rotating shaft, the two ends of the rotating shaft are respectively connected to the casing through bearing mechanisms to rotatably support the screw unit in the compression chamber, the end of the spiral portion and the bearing mechanism on the corresponding side form an isolation chamber isolated from the compression chamber, the casing is provided with a pressure relief channel connecting the isolation chamber with the outside world, and a switch component for opening or closing the pressure relief channel; the switch component includes a blocking shaft, the blocking shaft has an open movement state in which it moves a set distance under the action of an external force to open the pressure relief channel, and a closed movement state in which it elastically moves and resets after the pressure is removed.

[0006] As a further improvement of the present invention, the pressure relief channel includes a first flow channel, a second flow channel, and a third flow channel that are connected to each other, wherein the first flow channel is connected to the isolation chamber, the second flow channel is arranged along the radial direction of the first flow channel, and the third flow channel is arranged along the radial direction of the second flow channel and extends to the outside of the casing to form a pressure relief outlet;

[0007] The housing is provided with a mounting channel coaxially arranged with the second flow channel, and the mounting channel extends outwardly to the outside of the housing along the axial direction of the second flow channel. The switch component is configured in the mounting channel to disconnect or connect the second flow channel and the third flow channel.

[0008] As a further improvement of the present invention, the blocking shaft is a cylindrical structure coaxially arranged with the installation channel, and the blocking shaft reciprocates along its own axis under the action of external force;

[0009] The switch component further includes:

[0010] a connecting seat, the connecting seat being fixedly disposed on an end of the mounting channel away from the second flow channel;

[0011] A return spring is sleeved on one end of the blocking shaft away from the second flow channel, and two ends of the return spring are elastically abutted against the blocking shaft and the connecting seat respectively.

[0012] As a further improvement of the present invention, the blocking shaft has a blocking portion, a pressed portion, and a linkage portion integrally connected between the blocking portion and the pressed portion. The end of the blocking portion away from the linkage portion has a conical structure, and the small end of the conical structure is adapted to the outlet of the second flow channel. The end of the pressed portion away from the linkage portion has a limiting portion inserted into the inner ring of the return spring.

[0013] As a further improvement of the present invention, the end of the connecting seat facing the blocking shaft is provided with a positioning groove for the blocking shaft to pass through;

[0014] The return spring is placed in the positioning groove and is elastically connected to the blocking shaft.

[0015] As a further improvement of the present invention, the connecting seat further comprises a mounting portion sealedly connected to the mounting channel, and a holding portion integrally connected to the mounting portion and placed outside the housing;

[0016] The inner wall surface of the installation channel connected to the installation portion is stepped along the axial direction.

[0017] As a further improvement of the present invention, the radial dimension of the second flow channel is smaller than the radial dimensions of the first flow channel and the third flow channel.

[0018] The beneficial effect of the utility model is that a pressure relief channel is provided on the casing to connect the isolation chamber with the outside world, and a switch component is provided on the pressure relief channel. The difference between the action force of the reset spring and the pressure in the isolation chamber is used to drive the movement of the blocking shaft to automatically control the amount of lubricating oil released in the isolation chamber, so that the pressure in the isolation chamber is maintained at a set value, thereby balancing the axial load of the rotating shaft and the bearing mechanism to extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the compressor of the utility model;

[0020] Figure 2 This is a schematic diagram showing the structure of a local detail 1 inside the compressor of the present invention;

[0021] Figure 3 This is a schematic diagram showing the structure of a local detail 2 inside the compressor of the present invention;

[0022] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure of A;

[0023] Figure 5 This is a schematic diagram showing the switch component of the present invention and its internal structure.

[0024] The following description is made with reference to the accompanying drawings:

[0025] 1. Casing; 101. Compression chamber; 102. Isolation chamber; 103. Pressure relief channel;

[0026] 1031. First flow channel; 1032. Second flow channel; 1033. Third flow channel; 10331. Pressure relief outlet; 104. Mounting channel; 2. Screw unit; 201. Rotating shaft; 202. Spiral portion; 3. Bearing mechanism; 4. Switch component; 401. Blocking shaft; 4011. Blocking portion; 4012. Pressed portion; 4013. Linkage portion; 4014. Conical structure; 4015. Limiting portion; 402. Connecting seat; 4021. Positioning groove; 4022. Mounting portion; 4023. Holding portion; 403. Return spring. DETAILED DESCRIPTION

[0027] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0028] See Figures 1 to 5The compressor with a pressure balance structure provided by the present invention includes a casing 1 and a screw unit 2 provided in a compression chamber 101 of the casing 1. The screw unit 2 includes a rotating shaft 201 coaxially arranged with the compression chamber 101 and a spiral portion 202 sleeved on the rotating shaft 201. The two ends of the rotating shaft 201 are respectively connected to the casing 1 through bearing mechanisms 3 to rotatably support the screw unit 2 in the compression chamber 101. The end of the spiral portion 202 and the bearing mechanism 3 on the corresponding side form an isolation chamber 102 isolated from the compression chamber 101. Figure 2 For reference, the bearing mechanism 3 has a bearing seat and a bearing. The rotating shaft is connected to the bearing seat through the bearing. The bearing seat is installed on the casing. A star wheel unit is also provided on both sides of the compression chamber of the compressor. The star wheel unit has star wheel teeth that mesh with the spiral portion 202 of the rotating shaft 201. When the power source drives the rotating shaft to rotate, it drives the two star wheel teeth to move from the head end to the end relative to the spiral portion 202 to achieve air compression. It should be noted that the working principle of compressing air in a single-screw air compressor belongs to the existing technology and will not be repeated here.

[0029] The housing 1 is provided with a pressure relief passage 103 connecting the isolation chamber 102 to the outside world, and a switch component 4 for opening and closing the pressure relief passage 103. The switch component 4 includes a blocking shaft 401. The blocking shaft 401 has an open state, in which it moves a set distance under the action of an external force to open the pressure relief passage 103, and a closed state, in which it elastically returns to its original position after the pressure is removed. The external force is the pressure generated within the isolation chamber 102. When the pressure within the isolation chamber 102 exceeds the set value, lubricating oil enters the pressure relief passage 103 in the form of mist, pushing the blocking shaft 401 to move, gradually opening the pressure relief passage 103 to release pressure. Otherwise, the pressure relief passage 103 is gradually closed.

[0030] Furthermore, the pressure relief channel 103 is arranged in a generally "H"-shaped path, comprising a first flow channel 1031, a second flow channel 1032, and a third flow channel 1033. The first flow channel 1031 is in communication with the isolation chamber 102, the second flow channel 1032 is arranged radially of the first flow channel 1031, and the third flow channel 1033 is arranged radially of the second flow channel 1032 and extends outside the housing 1 to form a pressure relief outlet 10331. The housing 1 is provided with a mounting channel 104 coaxially arranged with the second flow channel 1032 and extending outwardly along the axis of the second flow channel 102 to the outside of the housing 1. The switch component 4 is disposed in the mounting channel 104 to disconnect or connect the second flow channel 1032 and the third flow channel 1033. The pressure relief channel 1033 is formed by a combination of multiple flow channels, which can reduce the pressure of the high-pressure lubricating oil when it reaches the pressure relief outlet 10331, thereby reducing the damage of the high-pressure oil to the docking equipment of the pressure relief outlet 10331, and also reducing the noise generated by the injection.

[0031] Furthermore, the blocking shaft 401 is a cylindrical structure coaxially arranged with the mounting channel 104, and the blocking shaft 401 moves back and forth along its own axial direction under the action of external force; the blocking shaft 401 has a blocking portion 4011, a pressed portion 4012, and a linkage portion 4013 integrally connected between the blocking portion 4011 and the pressed portion 4012, and the end of the blocking portion 4011 away from the linkage portion 4013 is a conical structure 4014, and the small end of the conical structure 4014 is adapted to the outlet of the second flow channel 1032, wherein the radial dimension of the blocking portion 4011 is slightly smaller than the radial dimension of the mounting channel 104, so that when the blocking shaft 401 moves toward the side away from the second flow channel 1032, the fluid area of ​​the mounting channel is gradually released, which can accurately control the leakage flow to a certain extent and improve the sensitivity of the movement of the blocking shaft.

[0032] Furthermore, the switch component 4 also includes a connecting seat 402 and a return spring 403. The connecting seat 402 is fixedly mounted on the end of the mounting channel 104 away from the second flow channel 1032. The return spring 403 is sleeved on the end of the blocking shaft 401 away from the second flow channel 1032. The two ends of the return spring 403 elastically abut the blocking shaft 401 and the connecting seat 402, respectively. The end of the pressed portion 4012 away from the linkage portion 4013 has a stopper 4015 that inserts into the inner ring of the return spring 403, achieving a coaxial connection between the return spring, the blocking shaft, and the connecting seat. At the same time, it ensures that the spring force provided by the return spring 403 is in the direction of its axis, ensuring stable driving of the blocking shaft.

[0033] Furthermore, a positioning groove 4021 is provided at one end of the connecting seat 402 facing the blocking shaft 401 for the blocking shaft 401 to pass through; the return spring 403 is placed in the positioning groove 4021 and elastically connected to the blocking shaft 401, ensuring the reliable connection between the return spring and the blocking shaft and the stability of the movement process.

[0034] Furthermore, the connection base 402 includes a mounting portion 4022 that is sealed with the mounting channel 104, and a retaining portion 4023 that is integrally connected to the mounting portion 4022 and positioned outside the housing 1. The inner wall surface of the mounting channel 104 connecting to the mounting portion 402 is stepped along its axial direction. An O-ring (not shown) is fitted over the mounting portion 4022, with the O-ring positioned adjacent to the corresponding step end surface, thereby ensuring a sealed connection between the mounting portion 4022 and the mounting channel 104 and preventing lubricating oil from spurting out of the mounting channel 104.

[0035] Furthermore, the radial dimension of the second flow channel 1032 is smaller than the radial dimensions of the first flow channel 1031 and the third flow channel 1033 .

[0036] For the convenience of description, one end of the connection seat 402 of the switch component 4 is defined as the rear end, and one end of the blocking shaft 401 is defined as the front end. The specific pressure balancing process is as follows: when the pressure in the isolation chamber 102 exceeds the standard, the high-pressure oil enters the second flow channel 1032 from the isolation chamber 102 through the first flow channel 1031. Due to the sudden decrease in the diameter of the second flow channel 1032, the oil pressure increases again and is ejected from the second flow channel 1032, generating a thrust greater than the force of the return spring 403 to push the blocking shaft 401 and enter the installation channel 104. The diameter is smaller, so it will not return to the second flow channel 1032 when colliding with the front end of the blocking shaft 401, and since the diameter of the mounting channel 104 is larger than the second flow channel 1032, the oil pressure is restored after entering the mounting channel 104; when the blocking shaft 401 gradually moves backward, the lubricating oil entering the mounting channel 104 flows out from the gap between the blocking shaft 401 and the mounting channel 104 into the third flow channel 1033, and is finally ejected from the pressure relief outlet 10331, thereby releasing the pressure in the isolation chamber 102 and keeping it in a balanced state.

[0037] On the contrary, when the pressure in the isolation chamber 102 gradually returns to a balanced state, the blocking shaft 401 gradually moves forward under the action of the return spring until the second flow channel is closed.

[0038] To sum up, the compressor with a pressure balancing structure provided by the utility model is equipped with a pressure relief channel on the casing to connect the isolation chamber with the outside world, and a switch component is arranged on the pressure relief channel. The difference between the action force of the reset spring and the pressure in the isolation chamber is used to drive the movement of the sealing shaft to automatically control the discharge amount of the lubricating oil in the isolation chamber, so that the pressure in the isolation chamber is maintained at a set value, thereby balancing the axial load of the rotating shaft and the bearing mechanism to extend its service life.

[0039] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A compressor with a pressure balance structure, comprising a casing (1), and a screw unit (2) provided in a compression chamber (101) of the casing (1), wherein the screw unit (2) comprises a rotating shaft (201) coaxially arranged with the compression chamber (101), and a spiral portion (202) sleeved on the rotating shaft (201), wherein both ends of the rotating shaft (201) are connected to the casing (1) via bearing mechanisms (3) so as to rotatably support the screw unit (2) in the compression chamber (101), and the distal end of the spiral portion (202) and the bearing mechanism (3) on the corresponding side form an isolation chamber (102) isolated from the compression chamber (101), characterized in that: The housing (1) is provided with a pressure relief passage (103) for connecting the isolation chamber (102) with the outside, and a switch component (4) for opening or closing the pressure relief passage (103); the switch component (4) comprises a blocking shaft (401), and the blocking shaft (401) has an open motion state in which it moves a set distance under the action of an external force to open the pressure relief passage (103), and a closed motion state in which it elastically moves and resets after the pressure is released.

2. The compressor with a pressure balance structure according to claim 1, characterized in that: The pressure relief channel (103) comprises a first flow channel (1031), a second flow channel (1032), and a third flow channel (1033) which are connected to each other, wherein the first flow channel (1031) is connected to the isolation chamber (102), the second flow channel (1032) is arranged along the radial direction of the first flow channel (1031), and the third flow channel (1033) is arranged along the radial direction of the second flow channel (1032) and extends to the outside of the casing (1) to form a pressure relief outlet (10331); The housing (1) is provided with a mounting channel (104) coaxially arranged with the second flow channel (1032), and the mounting channel (104) extends outwardly to the outside of the housing (1) along the axial direction of the second flow channel (1032). The switch component (4) is arranged in the mounting channel (104) to disconnect or connect the second flow channel (1032) and the third flow channel (1033).

3. The compressor with a pressure balance structure according to claim 2, characterized in that: The blocking shaft (401) is a cylindrical structure coaxially arranged with the installation channel (104), and the blocking shaft (401) reciprocates along its own axis under the action of external force; The switch component (4) further comprises: a connecting seat (402), the connecting seat (402) being fixedly disposed on an end of the mounting channel (104) away from the second flow channel (1032); A return spring (403) is sleeved on one end of the blocking shaft (401) away from the second flow channel (1032), and two ends of the return spring (403) are elastically abutted against the blocking shaft (401) and the connecting seat (402) respectively.

4. The compressor with a pressure balance structure according to claim 3, characterized in that: The blocking shaft (401) comprises a blocking portion (4011), a pressed portion (4012), and a linkage portion (4013) integrally connected between the blocking portion (4011) and the pressed portion (4012); an end of the blocking portion (4011) away from the linkage portion (4013) is in a conical structure (4014); a small end of the conical structure (4014) is adapted to the outlet of the second flow channel (1032); and an end of the pressed portion (4012) away from the linkage portion (4013) comprises a limiting portion (4015) inserted into the inner ring of the return spring (403).

5. The compressor with a pressure balance structure according to claim 4, characterized in that: One end of the connecting seat (402) facing the blocking shaft (401) is provided with a positioning groove (4021) for the blocking shaft (401) to pass through; The return spring (403) is placed in the positioning groove (4021) and is elastically connected to the blocking shaft (401).

6. The compressor with a pressure balance structure according to claim 5, characterized in that: The connecting seat (402) further includes a mounting portion (4022) sealedly connected to the mounting channel (104), and a holding portion (4023) integrally connected to the mounting portion (4022) and positioned outside the housing (1); The inner wall surface of the mounting channel (104) connected to the mounting portion (4022) is stepped along its axial direction.

7. The compressor with a pressure balance structure according to claim 4, characterized in that: The radial dimension of the second flow channel (1032) is smaller than the radial dimensions of the first flow channel (1031) and the third flow channel (1033).

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