Mechanical vacuum pump

Abstract

The utility model discloses a mechanical vacuum pump which comprises a cavity seat, a driving screw rod, a driven screw rod and a motor module, wherein the driving screw rod and the driven screw rod are mounted in the cavity seat in a mutually matched manner and rotate synchronously; the motor module is used for driving the driving screw rod to rotate; the motor module comprises a motor shell fixed outside the cavity seat, a stator fixed in the motor shell and a rotor which is arranged in the stator in a penetrating manner and can rotate relative to the stator, and the rotor is provided with a through shaft hole; the connecting shaft at the end part of the driving screw rod is fixed in the shaft hole in a penetrating manner, so that the driving screw rod can be linked with the rotor without using a coupler for connection, the assembly structure is extremely simple, few parts are used, the assembly efficiency is high, the operation cost is saved, and the motor module directly drives the driving screw rod, so that the motor module is high in operation efficiency, reliable and durable; the assembly structure of the driving screw and the motor module is very compact, the needed installation space is small, meanwhile, the size of the whole structure is small, the size of the whole mechanical vacuum pump becomes small, and installation and use are convenient.

Description

Technical field:

[0001] The utility model relates to the technical field of pump products, in particular to a mechanical vacuum pump. Background technology:

[0002] The screw vacuum pump is a mechanical vacuum pump that uses a screw to compress and extract gas. It has the characteristics of high vacuum degree, high pumping speed and high precision.

[0003] The screw vacuum pump uses two synchronously rotating screws that mesh with each other in the pump chamber to suck gas from the air inlet, and compress and extract the gas through the rotation of the screw. Compared with traditional root vacuum pumps, screw vacuum pumps have higher pumping speeds and lower vibration noise.

[0004] The Chinese utility model patent with announcement number CN210003504U discloses a screw pump with a self-cleaning structure, which includes a motor, a fixed seat, a screw pump housing, a left end cover, a right end cover, a cleaning component, a transmission component, a first screw and a second screw, wherein the transmission component includes a transmission shaft, a first rotating shaft, a second rotating shaft, a first gear, a second gear and a group of bearings, one end of the transmission shaft is connected to the motor through a coupling, and the other end of the transmission shaft is connected to the first rotating shaft, the first gear is connected to the first rotating shaft through a spline, the second gear is connected to the second rotating shaft through a spline, the first gear and the second gear are meshed, the first rotating shaft and the second rotating shaft are arranged on the screw pump housing through bearings, the first screw is connected to the first rotating shaft, and the second screw is connected to the second rotating shaft.

[0005] That is to say, the first screw is connected to the first rotating shaft, and the first rotating shaft is connected to the other end of the transmission shaft, and one end of the transmission shaft is connected to the motor through a coupling, thereby realizing a connection between a screw and a motor. Its connection structure is complex, and many parts are used. The operation efficiency is not high, and the assembly efficiency is not high. It is not conducive to mechanical sealing and requires a larger installation space. At the same time, the size of the entire connection structure is large, which makes the volume of the entire screw pump larger, and it is not convenient to install and use.

[0006] In view of this, the inventor proposes the following technical solution. Utility model content:

[0007] The utility model aims to overcome the deficiencies of the prior art and provide a mechanical vacuum pump.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: the mechanical vacuum pump includes a cavity seat, a driving screw and a driven screw which are installed in the cavity seat in cooperation with each other and rotate synchronously, and a motor module for driving the driving screw to rotate, and the cavity seat has an air inlet and an air outlet connected to its inner cavity; the motor module includes a motor housing fixed to the outside of the cavity seat, a stator fixed in the motor housing, and a rotor which is passed through the stator and can rotate relative to the stator, and the rotor has a through axial hole; the connecting shaft at the end of the driving screw is passed through and fixed in the axial hole.

[0009] Furthermore, in the above technical solution, the motor housing includes a shell fixed to the outside of the cavity seat and a cover fixed to the rear end of the shell, a channel passes through the middle of the shell, a step groove is provided at the rear end of the channel, the stator is positioned in the step groove, and the stator is fixed in the step groove by injecting a molding colloid, and the colloid also fills the step groove; the cover covers the colloid and the channel.

[0010] Furthermore, in the above technical solution, the axial hole includes a first hole position and a second hole position which are interconnected, wherein the diameter of the first hole position is larger than the diameter of the second hole position, and the connecting shaft is inserted along the first hole position and is tightly fitted with the second hole position.

[0011] Furthermore, in the above technical solution, a cold water channel for passing cooling water to achieve cooling and heat dissipation is provided outside the motor housing, and a first water inlet hole and a first water outlet hole of the cold water channel are exposed outside the motor housing.

[0012] Furthermore, in the above technical solution, the cold water channel is distributed on the motor housing in a spiral shape.

[0013] Furthermore, in the above technical solution, one end of the active screw and the driven screw are rotatably inserted into the first bearing seat, and one end of the active screw is the connecting shaft; the other ends of the active screw and the driven screw are rotatably inserted into the second bearing seat, and the first synchronous gear arranged at the other end of the active screw is meshed with the second synchronous gear arranged at the other end of the driven screw; the first bearing seat and the second bearing seat are respectively fixed at both ends of the cavity seat.

[0014] Furthermore, in the above technical solution, the two ends of the active screw are respectively sleeved with a first sealing piston and a second sealing piston, and the outside of the first sealing piston and the second sealing piston are respectively formed with a plurality of first sealing bulges and second sealing bulges that protrude outward and are distributed at intervals, the first sealing bulge is in sealing contact with the first bearing seat, and the second sealing bulge is in sealing contact with the second bearing seat.

[0015] Furthermore, in the above technical solution, a third sealing piston and a fourth sealing piston are respectively sleeved on both ends of the driven screw, and the third sealing piston and the fourth sealing piston are respectively formed with multiple third sealing bulges and fourth sealing bulges protruding outward and distributed at intervals on the outside, the third sealing bulge is in sealing contact with the first bearing seat, and the fourth sealing bulge is in sealing contact with the second bearing seat.

[0016] Furthermore, in the above technical solution, the motor housing is fixed on the first bearing seat to form a sealing assembly, and the first bearing seat is provided with a water inlet interface connected to the first water inlet hole, the water inlet interface is connected to the water inlet pipe, and the first water outlet hole is connected to the water outlet pipe.

[0017] Furthermore, in the above technical scheme, a first labyrinth cooling groove and a second labyrinth cooling groove isolated from the first labyrinth cooling groove and a bottom plate covering the first labyrinth cooling groove and the second labyrinth cooling groove are provided at the bottom of the cavity seat, and the bottom plate is provided with a second water inlet hole and a second water outlet hole respectively connected to the first labyrinth cooling groove and the second labyrinth cooling groove; a third labyrinth cooling groove connected to the first labyrinth cooling groove and a front cover plate covering the outside of the third labyrinth cooling groove are provided at the front end of the cavity seat, a fourth labyrinth cooling groove connected to the second labyrinth cooling groove and a rear cover plate covering the outside of the fourth labyrinth cooling groove are provided at the rear end of the cavity seat, and a fifth labyrinth cooling groove connected to the fourth labyrinth cooling groove and the third labyrinth cooling groove and an upper cover plate covering the outside of the fifth labyrinth cooling groove are provided at the upper end of the cavity seat.

[0018] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art: when the active screw in the utility model is assembled with the motor module, the connecting shaft at the end of the active screw is directly passed through and fixed in the axial hole of the rotor in the motor module, so that the active screw and the rotor can be linked without the need for a coupling. The assembly structure is extremely simple, uses fewer parts, has high assembly efficiency, saves operating costs, and the motor module directly drives the active screw, which has high operating efficiency, and is reliable and durable. In addition, the assembly structure of the active screw and the motor module is extremely compact, requires a small installation space, and the size of the entire structure is small, which makes the volume of the entire mechanical vacuum pump smaller, easy to install and use, and has a wide range of applications, and has strong market competitiveness. Description of the drawings:

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a stereogram of another viewing angle of the utility model;

[0021] Figure 3 It is a cross-sectional view of the utility model;

[0022] Figure 4 It is the internal structure diagram of the utility model;

[0023] Figure 5 It is a three-dimensional diagram of the motor housing in the utility model;

[0024] Figure 6 It is a cross-sectional view of the motor housing in the utility model;

[0025] Figure 7 It is a stereogram of the assembly of the stator and the rotor in the utility model;

[0026] Figure 8 It is an assembly stereogram of the stator and the rotor in the utility model from another perspective;

[0027] Fig. 9 It is a cross-sectional view of the stator and the rotor in the utility model;

[0028] Fig.10 It is a three-dimensional exploded view of the cavity seat in the utility model;

[0029] Fig.11 It is an assembly diagram of the cavity seat in the utility model;

[0030] Fig.12 It is a three-dimensional diagram of the cavity seat in the utility model. Specific implementation method:

[0031] The utility model is further described below in conjunction with specific embodiments and drawings.

[0032] See Figure 1-12 As shown, a mechanical vacuum pump comprises a cavity seat 1, a driving screw 2 and a driven screw 3 which are installed in the cavity seat 1 in cooperation with each other and rotate synchronously, and a motor module 4 for driving the driving screw 2 to rotate. The cavity seat 1 has an air inlet 106 and an air outlet 107 which are connected to its inner cavity 10. When working, the motor module 4 is used to drive the driving screw 2 to rotate, and the driving screw 2 and the driven screw 3 rotate synchronously, thereby sucking gas from the air inlet 106, compressing and extracting it through the driving screw 2 and the driven screw 3, and then discharging it from the air outlet 107.

[0033] The utility model improves the assembly structure of the motor module 4 and the active screw 2, specifically as follows: the motor module 4 includes a motor housing 41 fixed to the outside of the cavity seat 1, a stator 42 fixed in the motor housing 41, and a rotor 43 passing through the stator 42 and rotatable relative to the stator 42, the rotor 43 having a through shaft hole 431; the connecting shaft 21 at the end of the active screw 2 is passed through and fixed in the shaft hole 431. That is to say, when the active screw 2 is assembled with the motor module 4, the connecting shaft 21 at the end of the active screw 2 is directly passed through and fixed in the shaft hole 431 of the rotor 43 in the motor module 4, so that the active screw 2 can be linked with the rotor 43 without the need for a coupling. The assembly structure is extremely simple, uses fewer parts, has high assembly efficiency, saves operating costs, and the motor module 4 directly drives the active screw 2, which has high operating efficiency, is reliable and durable; in addition, the assembly structure of the active screw 2 and the motor module 4 is extremely compact, requires a small installation space, and the size of the entire structure is small, which makes the volume of the entire mechanical vacuum pump smaller, easy to install and use, and has a wide range of applications, and has strong market competitiveness.

[0034] The motor housing 41 includes a shell 411 fixed to the outside of the cavity seat 1 and a cover 412 fixed to the rear end of the shell 411. A channel 401 passes through the middle of the shell 411, and a stepped groove 402 is arranged at the rear end of the channel 401. The stator 42 is inserted and positioned in the stepped groove 402, and the stator 42 is fixed in the stepped groove 402 by injecting a molding colloid 44, and the colloid 44 also fills the stepped groove 402, thereby ensuring that the stator 42 is stably installed in the shell 411; the cover 412 covers the colloid 44 and the channel 401 to ensure the stability of the assembly structure.

[0035] The shaft hole 431 includes a first hole position 403 and a second hole position 404 which are interconnected, wherein the diameter of the first hole position 403 is larger than the diameter of the second hole position 404, and the connecting shaft 21 is inserted along the first hole position 403 and is tightly fitted with the second hole position 404, so that the installation is more convenient. After the insertion and installation is completed, the connecting shaft 21 is tightly fitted with the second hole position 404 by hot pressing at a later stage. The hot pressing fastening method is a conventional technical means and will not be described in detail here.

[0036] In order to make the motor module 4 run more stably, the structure is improved to improve the heat dissipation effect, specifically: the motor housing 41 is provided with a cold water channel 408 for passing cooling water to achieve cooling and heat dissipation, and the first water inlet 405 and the first water outlet 406 of the cold water channel 408 are both exposed to the outside of the motor housing 41. In specific use, cooling water is passed through the first water inlet 405, and the cooling water takes away the heat generated by the motor module 4 after passing through the cold water channel 408, and is discharged through the first water outlet 406, thereby achieving the purpose of water cooling, and its cooling and heat dissipation effect is excellent, making the motor module 4 run more stably. Among them, the cold water channel 408 is distributed on the motor housing 41 in a spiral shape, so that the cooling water in the cold water channel 408 can better take away the heat, thereby improving the heat dissipation effect.

[0037] The assembly structure of the active screw 2 and the driven screw 3 is as follows:

[0038] One end of the active screw 2 and the driven screw 3 are rotatably inserted into the first bearing seat 51, and one end of the active screw 2 is the connecting shaft 21; the other ends of the active screw 2 and the driven screw 3 are rotatably inserted into the second bearing seat 52, and the first synchronous gear 22 set at the other end of the active screw 2 is meshed with the second synchronous gear 31 set at the other end of the driven screw 3, so that the active screw 2 and the driven screw 3 are linked to achieve synchronous rotation; the first bearing seat 51 and the second bearing seat 52 are respectively fixed to the two ends of the cavity seat 1.

[0039] The two ends of the active screw 2 are respectively sleeved with a first sealing piston 23 and a second sealing piston 24, and the first sealing piston 23 and the second sealing piston 24 are respectively formed with multiple first sealing convex portions and second sealing convex portions protruding outward and distributed at intervals. The first sealing convex portion is in sealing contact with the first bearing seat 51, and the second sealing convex portion is in sealing contact with the second bearing seat 52, and the sealing effect is excellent.

[0040] The two ends of the driven screw 3 are respectively sleeved with a third sealing piston 32 and a fourth sealing piston 33, and the third sealing piston 32 and the fourth sealing piston 33 are respectively formed with multiple third sealing convexities and fourth sealing convexities protruding outward and distributed at intervals on the outside, the third sealing convexity is in sealing contact with the first bearing seat 51, and the fourth sealing convexity is in sealing contact with the second bearing seat 52, and the sealing effect is excellent.

[0041] The motor housing 41 is fixed on the first bearing seat 51 to form a sealing assembly, and the first bearing seat 51 is provided with a water inlet interface 511 connected to the first water inlet hole 405, the water inlet interface 511 is connected to the water inlet pipe, and the first water outlet hole 406 is connected to the water outlet pipe.

[0042] The bottom of the cavity seat 1 is provided with a first labyrinth cooling groove 101 and a second labyrinth cooling groove 102 isolated from the first labyrinth cooling groove 101, and a bottom plate 11 covering the first labyrinth cooling groove 101 and the second labyrinth cooling groove 102, and the bottom plate 11 is provided with a second water inlet hole 111 and a second water outlet hole 112 respectively connected to the first labyrinth cooling groove 101 and the second labyrinth cooling groove 102; the front end of the cavity seat 1 is provided with a third labyrinth cooling groove connected to the first labyrinth cooling groove 101. The cavity seat 1 is provided with a fourth labyrinth cooling groove 104 connected with the second labyrinth cooling groove 102 and a rear cover plate 13 covered on the outside of the fourth labyrinth cooling groove 104 at the rear end thereof, and the cavity seat 1 is provided with a fifth labyrinth cooling groove 105 connected with the fourth labyrinth cooling groove 104 and the third labyrinth cooling groove 103 and an upper cover plate 14 covered on the outside of the fifth labyrinth cooling groove 105 at the upper end thereof. During specific use, cooling water enters from the second water inlet hole 111, passes through the first labyrinth cooling groove 101, the third labyrinth cooling groove 103, the fourth labyrinth cooling groove 104, the fifth labyrinth cooling groove 105, and the second labyrinth cooling groove 102 in sequence, and is discharged from the second water outlet hole 112, and then flows around the cavity seat 1 through the cooling water, so that the heat generated by the spiral extrusion of the active screw 2 and the driven screw 3 and transferred to the cavity seat 1 can be effectively taken away, thereby ensuring that the utility model operates more stably and with better efficiency.

[0043] To sum up, when the active screw 2 in the utility model is assembled with the motor module 4, the connecting shaft 21 at the end of the active screw 2 is directly passed through and fixed in the shaft hole 431 of the rotor 43 in the motor module 4, so that the active screw 2 can be linked with the rotor 43 without the need for a coupling. The assembly structure is extremely simple, with few parts used, high assembly efficiency, and saved operating costs. The motor module 4 directly drives the active screw 2, and the operation efficiency is high, and it is reliable and durable. In addition, the assembly structure of the active screw 2 and the motor module 4 is extremely compact, and the installation space required is small. At the same time, the size of the entire structure is small, which makes the volume of the entire mechanical vacuum pump smaller, easy to install and use, and has a wide range of applications, and has strong market competitiveness.

[0044] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A mechanical vacuum pump, comprising a cavity seat (1), a driving screw (2) and a driven screw (3) which are mutually mounted in the cavity seat (1) and rotate synchronously, and a motor module (4) for driving the driving screw (2) to rotate, wherein the cavity seat (1) has an air inlet (106) and an air outlet (107) which are connected to its inner cavity (10); Features: The motor module (4) comprises a motor housing (41) fixed to the outside of the cavity seat (1), a stator (42) fixed in the motor housing (41), and a rotor (43) passing through the stator (42) and rotatable relative to the stator (42), wherein the rotor (43) has a through shaft hole (431); the connecting shaft (21) at the end of the active screw rod (2) is passed through and fixed in the shaft hole (431).

2. A mechanical vacuum pump according to claim 1, characterized in that: The motor housing (41) comprises a shell (411) fixed to the outside of the cavity seat (1) and a cover (412) fixed to the rear end of the shell (411); a channel (401) passes through the middle of the shell (411); a stepped groove (402) is provided at the rear end of the channel (401); the stator (42) is inserted and positioned in the stepped groove (402), and a colloid (44) is injected to fix the stator (42) in the stepped groove (402), and the colloid (44) also fills the stepped groove (402); the cover (412) covers the colloid (44) and the channel (401).

3. A mechanical vacuum pump according to claim 1, characterized in that: The shaft hole (431) includes a first hole position (403) and a second hole position (404) which are interconnected, wherein the diameter of the first hole position (403) is larger than the diameter of the second hole position (404), and the connecting shaft (21) is inserted along the first hole position (403) and is tightly fitted with the second hole position (404).

4. A mechanical vacuum pump according to claim 1, characterized in that: A cold water channel (408) for passing cooling water to achieve cooling and heat dissipation is provided outside the motor housing (41), and a first water inlet (405) and a first water outlet (406) of the cold water channel (408) are both exposed outside the motor housing (41).

5. A mechanical vacuum pump according to claim 4, characterized in that: The cold water channel (408) is distributed on the motor housing (41) in a spiral shape.

6. A mechanical vacuum pump according to claim 4, characterized in that: One end of the active screw (2) and the driven screw (3) are both rotatably inserted into the first bearing seat (51), and one end of the active screw (2) is the connecting shaft (21); the other ends of the active screw (2) and the driven screw (3) are both rotatably inserted into the second bearing seat (52), and a first synchronous gear (22) provided at the other end of the active screw (2) is meshed with a second synchronous gear (31) provided at the other end of the driven screw (3); the first bearing seat (51) and the second bearing seat (52) are respectively fixed to the two ends of the cavity seat (1).

7. A mechanical vacuum pump according to claim 6, characterized in that: A first sealing piston (23) and a second sealing piston (24) are respectively sleeved at both ends of the active screw (2); the first sealing piston (23) and the second sealing piston (24) are respectively formed with a plurality of first sealing convex portions and second sealing convex portions protruding outward and spaced apart on their exteriors; the first sealing convex portion is in sealing contact with the first bearing seat (51), and the second sealing convex portion is in sealing contact with the second bearing seat (52).

8. A mechanical vacuum pump according to claim 6, characterized in that: The driven screw rod (3) is respectively sleeved with a third sealing piston (32) and a fourth sealing piston (33) at both ends. The third sealing piston (32) and the fourth sealing piston (33) are respectively formed with a plurality of third sealing convex portions and fourth sealing convex portions protruding outward and spaced apart on their exteriors. The third sealing convex portion is in sealing contact with the first bearing seat (51), and the fourth sealing convex portion is in sealing contact with the second bearing seat (52).

9. A mechanical vacuum pump according to claim 6, characterized in that: The motor housing (41) is fixed on the first bearing seat (51) to form a sealing assembly, and the first bearing seat (51) is provided with a water inlet interface (511) connected to the first water inlet hole (405), the water inlet interface (511) is connected to the water inlet pipe, and the first water outlet hole (406) is connected to the water outlet pipe.

10. A mechanical vacuum pump according to any one of claims 1 to 9, characterized in that: The bottom of the cavity seat (1) is provided with a first labyrinth cooling groove (101) and a second labyrinth cooling groove (102) isolated from the first labyrinth cooling groove (101), and a bottom plate (11) covering the first labyrinth cooling groove (101) and the second labyrinth cooling groove (102), the bottom plate (11) being provided with a second water inlet (111) and a second water outlet (112) respectively connected to the first labyrinth cooling groove (101) and the second labyrinth cooling groove (102); the front end of the cavity seat (1) is provided with a third labyrinth cooling groove (111) connected to the first labyrinth cooling groove (101) and the second labyrinth cooling groove (102). A third labyrinth cooling groove (103) and a front cover plate (12) covering the outside of the third labyrinth cooling groove (103); a fourth labyrinth cooling groove (104) communicating with the second labyrinth cooling groove (102) and a rear cover plate (13) covering the outside of the fourth labyrinth cooling groove (104) are arranged at the rear end of the cavity seat (1); a fifth labyrinth cooling groove (105) communicating with the fourth labyrinth cooling groove (104) and the third labyrinth cooling groove (103) and an upper cover plate (14) covering the outside of the fifth labyrinth cooling groove (105) are arranged at the upper end of the cavity seat (1).

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