CN218062668U

CN218062668U - Permanent magnet frequency conversion low-pressure screw air compressor

Info

Publication number: CN218062668U
Application number: CN202222066996.9U
Authority: CN
Inventors: 沈升; 焦战; 梁伟芳; 郑樟峰
Original assignee: Xinchang Shengtai Textile Technology Co ltd
Current assignee: Xinchang Shengtai Textile Technology Co ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-12-16
Anticipated expiration: 2032-08-08

Abstract

The utility model provides a permanent magnet frequency conversion low-pressure screw air compressor, which comprises a box body and a screw air compressor body arranged in the box body, wherein the box body is provided with a gas cooler for connecting an oil-gas separator of the screw air compressor body; the gas cooler comprises a plurality of cooling pieces which are arranged at intervals, and the cooling pieces are connected through heat-conducting clapboards; at least two heat-conducting partition plates are arranged at intervals along the length direction of the cooling piece, and a ventilation gap for air flow to pass through is formed between every two adjacent heat-conducting partition plates; the left side and the right side of the cooling part are correspondingly provided with heat dissipation grooves communicated with the ventilation gap, and the length direction of the heat dissipation grooves is the same as that of the cooling part. The utility model provides a permanent magnetism frequency conversion low pressure screw compressor machine through set up gas cooler on the box, can realize the effective cooling of giving vent to anger to box and screw compressor machine body, and simple structure, utilizes the cooling mode that forced air cooling and water-cooling combined together, and the cooling effect is better, and efficiency is higher.

Description

Permanent magnet frequency conversion low-pressure screw air compressor

Technical Field

The utility model belongs to the air compressor machine field especially relates to a permanent magnetism frequency conversion low pressure screw compressor machine.

Background

The air compressor is called as air compressor for short, and is a device for compressing gas, in recent years, the development of the air compressor is rapid, and the air compressor is widely applied to various industries, and particularly, the variable frequency air compressor is popular with users due to the characteristics of energy conservation, small mechanical impact, low failure rate and the like. The air compressor is constructed similarly to a water pump. The screw compressor is a rotary positive displacement compressor, wherein two rotors with spiral gears are meshed with each other, so that the volume of the meshed part of the two rotors is reduced from large to small, and gas is compressed and discharged. The stability of screw air compressor operation has very big relation rather than heat dispersion, and traditional heat dissipation is mostly single air-cooled heat dissipation, and the radiating efficiency is low, and the radiating effect is poor, is unfavorable for screw air compressor's steady operation.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a permanent magnetism frequency conversion low pressure screw compressor machine to solve the problem that current air-cooled heat dissipation formula screw compressor machine radiating efficiency is low.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a permanent magnet frequency conversion low-pressure screw air compressor comprises a box body and a screw air compressor body arranged in the box body, wherein the box body is provided with an air cooler used for connecting an oil-gas separator of the screw air compressor body; the gas cooler comprises a plurality of cooling pieces which are arranged at intervals, and the cooling pieces are connected through heat-conducting clapboards; at least two heat-conducting partition plates are arranged at intervals along the length direction of the cooling piece, and a ventilation gap for air flow to pass through is formed between every two adjacent heat-conducting partition plates; the left side and the right side of the cooling part are correspondingly provided with heat dissipation grooves communicated with the ventilation gaps, and the length direction of the heat dissipation grooves is the same as that of the cooling part; and a cold water pipe is arranged on the cooling part corresponding to the position above the radiating groove, and an air inlet pipe capable of being connected with an air outlet pipe of the oil-gas separator of the screw air compressor body is arranged corresponding to the position below the radiating groove.

Furthermore, the cold water pipes on the cooling part are sequentially connected in series, a water inlet pipe and a water outlet pipe which are communicated with the cold water pipes are arranged on the box body, one end of each cold water pipe which is sequentially connected in series is communicated with the water inlet pipe, and the other end of each cold water pipe is communicated with the water outlet pipe.

Furthermore, the air inlet pipes on the cooling part are sequentially connected in series and then communicated with the air outlet pipe of the oil-gas separator of the screw air compressor body.

Furthermore, one side of the cooling part facing the inside of the box body is provided with a cambered surface part which is convenient for airflow to enter the ventilation gap.

Furthermore, the heat dissipation groove is a C-shaped groove.

Furthermore, the cooling part is provided with a vent hole for communicating the radiating grooves on the left side and the right side of the cooling part.

Further, the ventilation hole sets up two along cooling element length direction at least interval, and each ventilation hole all communicates with ventilation gap.

Furthermore, the heat-conducting partition plate is provided with a gas passing hole, and the gas passing hole is communicated with the ventilation gap.

Compared with the prior art, a permanent magnetism frequency conversion low pressure screw compressor machine have following advantage:

the utility model provides a permanent magnetism frequency conversion low pressure screw compressor machine through set up gas cooler on the box, can realize the effective cooling of giving vent to anger to box and screw compressor machine body, and simple structure, utilizes the cooling mode that forced air cooling and water-cooling combined together, and the cooling effect is better, and efficiency is higher. Furthermore, the utility model provides a this kind of permanent magnetism frequency conversion low pressure screw air compressor machine, through set up the heat conduction baffle on gas cooler cooling piece, improved the area of contact of cooling piece and air current, the ventilation hole that sets up on the gas passing hole that combines to set up on the heat conduction baffle and the cooling piece has further improved the holistic radiating effect of gas cooler, be favorable to ensureing the permanent magnetism frequency conversion low pressure screw air compressor machine steady operation in the box, improved this kind of permanent magnetism frequency conversion low pressure screw air compressor machine security and reliability in service.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a permanent magnet frequency conversion low-pressure screw air compressor according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an air cooler in a permanent magnet variable frequency low-pressure screw air compressor according to an embodiment of the present invention;

fig. 3 is the embodiment of the utility model provides a structural schematic of cooling piece in permanent magnetism frequency conversion low pressure screw air compressor machine.

Description of reference numerals:

1. a box body; 2. a ventilation grille; 3. a water inlet pipe; 4. a water outlet pipe; 5. a sealing cover; 6. a cold water pipe; 7. an air inlet pipe; 8. a cooling member; 9. a vent hole; 10. a thermally conductive spacer; 11. air passing holes; 12. a heat sink; 13. an arc surface portion.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

A permanent magnet frequency conversion low-pressure screw air compressor is shown in figures 1 to 3 and comprises a box body 1 and a screw air compressor body (not shown in the figures) arranged in the box body 1, wherein an air cooler used for being connected with an oil-gas separator of the screw air compressor body is arranged on the box body 1. The existing general screw air compressor body comprises a permanent magnet motor, a screw main machine, an air inlet valve, an air filter, a cooler, a fan, an oil filter and an oil-gas separator, wherein a ventilation grating 2 is always arranged on the box body 1 corresponding to the cooler and the fan. Simultaneously in order to ensure the cleanliness factor that admits air, filtration equipment such as filter screen is still installed generally to the position that corresponds ventilation grid 2 on the box 1 to reduce foreign matters such as the dust in the box 1, ensure that screw compressor body can the steady operation.

The oil-gas separator can separate residual oil from the compressed air, so that the cleanliness of the compressed air is improved, and the pollution of the residual oil to the compressed air post-treatment and equipment is reduced. The upper end of the oil-gas separator is also connected with a pressure maintaining valve and a pressure sensor, and one side of the oil-gas separator is also provided with a temperature control valve. When the temperature control valve is in cold start, the equipment can reach the optimal working temperature as soon as possible, and the constant temperature and viscosity of the lubricating oil are maintained, so that the phenomena of steam condensation and lubricating oil emulsification in the equipment are prevented. Therefore, in order to continuously and stably operate the screw air compressor body, the temperature in the box body needs to be controlled.

In the practical application in-process, the cooler generally divide into gas cooler and oil cooler, and the gas cooler often keeps the valve to be connected with oil and gas separator outlet duct through the pressure to the realization is to the cooling of outlet duct exhaust gas, and the lubricating oil that oil cooler oil outlet pipe discharged generally flows into oil filter after fan cooling, spouts the internal cooling host computer of screw rod host computer after filtering. The utility model discloses main innovation lies in having carried out redesign to the gas cooler to do not relate to the improvement to other structures of screw compressor body, consequently no longer describe here.

Specifically, the air cooler comprises a plurality of cooling pieces 8 arranged at intervals, and the cooling pieces 8 are connected through heat-conducting clapboards 10; at least two heat-conducting partition plates 10 are arranged at intervals along the length direction of the cooling piece 8, and a ventilation gap for air flow to pass through is formed between every two adjacent heat-conducting partition plates 10; the left side and the right side of the cooling part 8 are correspondingly provided with heat dissipation grooves 12 communicated with the ventilation gap, and the length direction of the heat dissipation grooves 12 is the same as that of the cooling part 8; and a cold water pipe 6 is arranged on the cooling part 8 corresponding to the position above the radiating groove 12, and an air inlet pipe 7 capable of being connected with an air outlet pipe of the oil-gas separator of the screw air compressor body is arranged corresponding to the position below the radiating groove 12.

Alternatively, four, six, eight or ten cooling elements 8 may be provided at intervals, and those skilled in the art may select the number of cooling elements 8 according to actual needs. Exemplarily, cooling piece 8 can set up ten at the interval, connect through heat conduction baffle 10 between two adjacent cooling pieces 8, connect cooling piece 8 through utilizing heat conduction baffle 10, can make a plurality of cooling pieces 8 form stable structure, be convenient for install the air cooler on box 1, ensure that the air cooler can last stable play the cooling effect to box 1 and air-supply line 7, be favorable to reducing the temperature of box 1, improve the stability of screw air compressor body operation in box 1.

In the practical use process, the cooling element 8 can be fixed on the box body 1 through screw installation to realize stable installation of the cooling element 8 on the box body 1, and a person skilled in the art can also select other ways to install the cooling element 8 according to the actual needs to realize the installation and fixation of the gas cooler. By arranging the heat dissipation grooves 12 on the left side and the right side of the cooling piece 8, the contact area of the cooling piece 8 and air can be increased, particularly the contact area of the cooling piece 8 and air flow passing through a ventilation gap is increased, and therefore the cooling effect of the air flow on the cooling piece 8 is improved. In addition, the heat dissipation grooves 12 on two adjacent cooling pieces 8 can also form a cavity structure, after air flows upwards from the ventilation gap and enters the cavity, because the width of the cavity is slightly larger than that of the ventilation gap, the air flow can be temporarily retained or disturbed at the position, so that the air at the position can be more fully in surface contact with the cooling pieces 8, the heat on the surfaces of the cooling pieces 8 is taken away, and the cooling effect of the air flow on the cooling pieces 8 is favorably improved.

Optionally, the heat dissipation groove 12 is a C-shaped groove; compared with the heat dissipation grooves 12 with other shapes, the C-shaped grooves have larger surface areas, so that the cooling piece 8 has larger heat dissipation areas, and the cooling effect of airflow on the cooling piece 8 is improved. When passing through the cavity formed by the two C-shaped grooves, the airflow can be fully contacted with the surface of the cooling piece 8, and the heat on the surface of the cooling piece 8 is taken away; compared with the heat dissipation grooves 12 with other shapes, the air flow can smoothly pass through the heat dissipation grooves 12, the C-shaped grooves do not have an excessive blocking effect on the air flow, and the flowing efficiency of the air in the box body 1 is improved. In addition, the arc surface of C type groove still is favorable to the heat on the cooling part 8 to the clearance that ventilates to assemble, is favorable to further improving the cooling radiating effect of air current to cooling part 8.

Optionally, the cold water pipes 6 on the cooling part 8 are sequentially connected in series, the box body 1 is provided with a water inlet pipe 3 and a water outlet pipe 4 which are communicated with the cold water pipes 6, one end of each cold water pipe 6 which is sequentially connected in series is communicated with the water inlet pipe 3, and the other end of each cold water pipe 6 is communicated with the water outlet pipe 4. Exemplarily, the tank body 1 is provided with assembling holes for installing the water inlet pipe 3 and the water outlet pipe 4, the cold water pipes 6 are connected end to end in sequence, the cold water pipes 6 on the cooling parts 8 are connected in series to form a communicated pipeline, one end of the pipeline is communicated with the water inlet pipe 3, the other end of the pipeline is communicated with the water outlet pipe 4, and therefore cooling water entering the water inlet pipe 3 can sequentially pass through the cold water pipes 6 on the cooling parts 8 and finally is discharged out of the tank body 1 from the water outlet pipe 4. The cold water pipes 6 can be connected through U-shaped connectors to realize communication; the cold water pipe 6 and the water inlet pipe 3 and the water outlet pipe 4 can be connected by common pipeline connection, such as threaded connection or flange connection, and those skilled in the art can select the connection according to actual needs, and are not described herein.

Through set up cold water pipe 6 on cooling part 8, the usable cooling part 8 that directly cools down to cold water pipe 6 injection cooling water, through the heat conduction of cooling part 8, realizes the cooling to air-supply line 7 then. The air passing through the air inlet pipe 7 can be rapidly cooled under the combined action of air cooling and water cooling, so that the cooling effect and the cooling efficiency of the air cooler on the air passing through the air inlet pipe 7 are improved. Simultaneously, the temperature of the cooling part 8 is reduced through the cold water pipe 6, the cooling part 8 is further favorable for rapidly cooling the inside of the box body 1, the screw air compressor body in the box body 1 is ensured to be at a proper working temperature, and the working efficiency and the stability of the screw air compressor body are improved.

In addition, the cold water pipe 6 and the air inlet pipe 7 are respectively arranged at the upper end and the lower end of the cooling piece 8, so that temperature difference can be formed at the upper end and the lower end of the cooling piece 8, heat is conducted to the cold water pipe 6 in an accelerated manner, and the air inlet pipe 7 is cooled rapidly. During the in-service use, when the air current outwards flows from box 1, can be with 6 one sides of 8 cold water pipes of cooling part towards the inside setting of box 1, with 8 air-supply lines 7 one side of cooling part towards the outside setting of box 1 to improve the cooling effect of gas cooler to box 1 and air-supply lines 7, certain cooling can be realized through cold water pipe 6 earlier to the air current that flows, then cool down to cooling part 8 and air-supply lines 7 through air-supply lines 7 again, be favorable to improving the cooling effect of air current to air-supply lines 7. On the contrary, similarly, when the air flow flows from the outside of the box body 1 to the inside of the box body 1, one side of the cold water pipe 6 of the cooling part 8 can be arranged towards the outside of the box body 1, and one side of the air inlet pipe 7 of the cooling part 8 can be arranged towards the inside of the box body 1, and the person skilled in the art can select the cooling part according to the actual needs.

In the practical application process, the air inlet pipes 7 on the cooling pieces 8 can also be connected in series end to end in sequence to form a complete pipeline and then communicated with the air outlet pipe of the oil-gas separator of the screw air compressor body, so that the length of the air inlet pipes 7 is increased, the gas discharged by the air outlet pipe can be fully cooled in the air inlet pipes 7, and the cooling effect of the gas cooler on the gas in the air inlet pipes 7 is improved. Illustratively, the air inlet pipes 7 can be connected through U-shaped connectors to realize communication; wherein, air-supply line 7 one end accessible is connected with the outlet duct with adopting the pipeline connected mode commonly used, and the other end can be connected with external gas-using equipment, and the suitable connected mode can be selected by oneself according to actual need to the skilled person in the art, and it is no longer repeated here.

In addition, both the cold water pipe 6 and the air inlet pipe 7 can be welded and fixed on the cooling piece 8, through holes for installing the cold water pipe 6 and the air inlet pipe 7 are formed in the cooling piece 8, and a person skilled in the art can select other modes to install the cold water pipe 6 and the air inlet pipe 7 according to actual needs so as to realize stable arrangement of the cold water pipe 6 and the air inlet pipe 7 on the cooling piece 8, and details are not described herein.

Optionally, the water inlet pipe 3 and the water outlet pipe 4 can be provided with sealing covers 5, so that the water inlet pipe 3 or the water outlet pipe 4 is prevented from being blocked in the carrying process of the air compressor. Illustratively, the sealing cover 5 is in threaded connection with the water inlet pipe 3 or the water outlet pipe 4, and those skilled in the art can also adopt other ways to install the sealing cover 5 to realize the detachable assembly of the sealing cover 5 on the water inlet pipe 3 and the water outlet pipe 4. In the in-service use process, if the forced air cooling can satisfy the cooling demand, or lack external water supply equipment, the user also can not be connected inlet tube 3 and outlet pipe 4 with external water supply equipment, through the air current through the ventilation gap to the gas cooler dispel the heat can, the skilled person in the art can select according to actual need, no longer describe here.

Optionally, the side of the cooling element 8 facing the inside of the housing 1 is provided with an arc 13 facilitating the air flow into the ventilation gap. The cambered surface portion 13 can play a good shunting role for the air flow blown to the lower side of the cooling piece 8, ensure that the air flow can smoothly enter a ventilation gap, ensure that the air flow can smoothly pass through the air cooler, and cool the air cooler.

Optionally, the cooling member 8 is provided with a vent hole 9 for communicating the left and right heat dissipation grooves 12. The ventilation holes 9 are arranged at least two at intervals along the length direction of the cooling piece 8, and each ventilation hole 9 is communicated with the ventilation gap. Illustratively, three, six or nine vent holes 9 may be provided at intervals on the cooling element 8, and each vent hole 9 is communicated with the vent gap, and those skilled in the art may also provide a plurality of vent holes 9 on the cooling element 8 according to actual needs.

In the practical application process, the vent holes 9 are arranged on the cooling piece 8, so that firstly, the contact area between the cooling piece 8 and the airflow can be further increased, and the cooling effect of the airflow on the cooling piece 8 is improved; secondly, when the air current is passing through each ventilation clearance, because the air current is inhomogeneous, some ventilation clearances's air velocity is big, and other air velocity is little, through set up the ventilation hole 9 that is used for communicateing each ventilation clearance on cooling part 8 for the ventilation clearance that air velocity is big can play certain drive effect to the air current in its left and right sides ventilation clearance. Specifically, the pressure in the ventilation gap with the high air flow rate is low, and under the action of pressure difference, the air on the left side and the right side of the ventilation gap with the high air flow rate can flow towards the inside of the ventilation gap, and the air flow can also play a good cooling role for the cooling pieces 8 when passing through the ventilation holes 9, so that the air flow in the adjacent ventilation gaps can be driven to a certain extent, the cooling effect of the air flow on each cooling piece 8 is improved, and the whole air cooler can be ensured to continuously and uniformly play a cooling role for the air passing through the air inlet pipe 7.

Optionally, the heat conducting partition plate 10 is provided with an air passing hole 11, and the air passing hole 11 is communicated with the ventilation gap. Similarly, in order to ensure uniformity of the air flow passing through the ventilation gap, the heat-conducting partition plate 10 may also be provided with the air passing holes 11, and the air passing holes 11 may also increase the contact area between the heat-conducting partition plate 10 and the air flow, thereby increasing the cooling effect of the air flow on the heat-conducting partition plate 10. For example, the heat-conducting partition plate 10 may be welded and fixed on the cooling members 8, and by connecting the heat-conducting partition plate 10 to the cooling members 8, not only the structural strength and stability of the whole air cooler are improved, but also the heat-conducting partition plate 10 may have a good heat-conducting and heat-dissipating effect on the cooling members 8, which is equivalent to a heat-conducting fin, and is beneficial to improving the cooling effect of the whole air cooler.

The utility model provides a permanent magnetism frequency conversion low pressure screw compressor through set up gas cooler on the box, can realize the effective cooling of giving vent to anger to box and screw compressor body, and simple structure, utilizes the cooling mode that forced air cooling and water-cooling combined together, and the cooling effect is better, and efficiency is higher. Furthermore, the utility model provides a this kind of permanent magnetism frequency conversion low pressure screw compressor machine, through set up thermal baffle on gas cooler cooling piece, the area of contact of cooling piece and air current has been improved, the ventilation hole that sets up on the gas pocket of crossing that combines to set up on the thermal baffle and the cooling piece has further improved the holistic radiating effect of gas cooler, be favorable to ensureing the interior permanent magnetism frequency conversion low pressure screw compressor machine steady operation of box, this kind of permanent magnetism frequency conversion low pressure screw compressor machine security and reliability in service have been improved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a permanent magnetism frequency conversion low pressure screw compressor, includes the screw compressor body that sets up in box (1) and box (1), be equipped with the gas cooler that is used for connecting screw compressor body oil and gas separator on box (1), its characterized in that: the gas cooler comprises a plurality of cooling pieces (8) which are arranged at intervals, and the cooling pieces (8) are connected through heat-conducting clapboards (10); at least two heat-conducting partition plates (10) are arranged at intervals along the length direction of the cooling piece (8), and a ventilation gap for air flow to pass through is formed between every two adjacent heat-conducting partition plates (10); the left side and the right side of the cooling piece (8) are correspondingly provided with heat dissipation grooves (12) communicated with the ventilation gap, and the length direction of the heat dissipation grooves (12) is the same as that of the cooling piece (8); and a cold water pipe (6) is arranged on the cooling piece (8) corresponding to the position above the heat dissipation groove (12), and an air inlet pipe (7) capable of being connected with an air outlet pipe of an oil-gas separator of the screw air compressor body is arranged corresponding to the position below the heat dissipation groove (12).

2. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: cold water pipe (6) on cooling piece (8) establish ties in proper order, be equipped with inlet tube (3) and outlet pipe (4) with cold water pipe (6) intercommunication on box (1), cold water pipe (6) one end after establishing ties in proper order communicates with inlet tube (3), and the other end communicates with outlet pipe (4).

3. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: and the air inlet pipes (7) on the cooling piece (8) are sequentially connected in series and then communicated with an air outlet pipe of the oil-gas separator of the screw air compressor body.

4. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: and one side of the cooling part (8) facing the inside of the box body (1) is provided with a cambered surface part (13) facilitating airflow to enter a ventilation gap.

5. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: the heat dissipation groove (12) is a C-shaped groove.

6. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: and the cooling piece (8) is provided with a vent hole (9) for communicating the left and right radiating grooves (12) of the cooling piece.

7. The permanent magnet frequency conversion low-pressure screw air compressor of claim 6, characterized in that: the ventilation holes (9) are arranged at intervals along the length direction of the cooling piece (8), and each ventilation hole (9) is communicated with the ventilation gap.

8. The permanent magnet frequency conversion low-pressure screw air compressor of claim 1, characterized in that: and the heat-conducting partition plate (10) is provided with a gas passing hole (11), and the gas passing hole (11) is communicated with the ventilation gap.