A sliding valve pump

Abstract

The utility model provides a kind of slide valve pump, belong to the technical field of slide valve pump.It solves the problem of oil leakage and poor reliability of use of slide valve pump due to pulley transmission structure in prior art.This slide valve pump, including pump body, pump shaft rotationally arranged in pump body and motor installed on pump body, both ends of the pump shaft and pump body are respectively provided with bearing and oil seal, the connecting place of the pump body and motor both forms airtight chamber, one end of the pump shaft extends into chamber and is connected with the output shaft of the motor by rigid coupling, the other end of the pump shaft extends out of pump body and is sleeved with counterweight, the counterweight outer cover is equipped with wheel cover, the wheel cover is connected on pump body and forms airtight oil storage cavity with pump body, the oil storage cavity is connected with the air inlet of the pump body by oil return pipe.The utility model has the advantages of solving the problem of oil leakage and poor reliability of use of existing slide valve pump due to pulley transmission structure.

Description

Technical Field

[0001] This utility model belongs to the field of slide valve pump technology and relates to a slide valve pump. Background Technology

[0002] A slide valve pump is short for a slide valve type oil-sealed mechanical pump, which refers to a vacuum device for pumping general gases or gases containing a small amount of condensable vapor. For example, Chinese patent literature discloses a slide valve pump (authorization announcement number: CN204140410U), which includes a pump body, a motor mounted on the outer surface of the pump body, an oil tank mounted inside the pump body, and a lifting ring fixed to the pump body. The pump body has a pump chamber, an oil inlet channel connecting the pump chamber and the oil tank, and an air inlet channel and an air outlet channel connected to the pump chamber. A main shaft is inserted through the center of the pump chamber, with one end of the main shaft connected to the motor and the other end connected to an eccentric wheel mechanism. The motor is located at the top of the pump body. A motor shaft extends outward from the middle of the motor. A first pulley is fixedly connected to the motor shaft. A second pulley that cooperates with the first pulley is located on the main shaft. Several belts are provided between the first pulley and the second pulley. The eccentric wheel mechanism includes an eccentric wheel, a slide valve guide rail, and a slide valve fixedly connected to the eccentric wheel. The eccentric wheel is fixedly connected to the main shaft, and the axis of the main shaft and the axis of the eccentric wheel are on the same straight line. The slide valve guide rail passes through the pump body, and the slide valve is installed in the slide valve guide rail. The slide valve can slide up and down and swing left and right in the slide valve guide rail.

[0003] The slide valve pump has the following shortcomings during use: The slide valve pump adopts a belt pulley structure for transmission. Several belts between the first and second pulleys will apply a certain radial force to the main shaft and its bearings. This will not only accelerate the wear of the bearings, but may also cause slight bending deformation of the main shaft or misalignment of the bearing housing, thereby changing the relative position and stress state of the oil seal and the main shaft, which can easily lead to poor sealing and oil leakage. At the same time, belt drives have the disadvantages of belt bending loss, slight slippage and easy damage, resulting in poor reliability of the slide valve pump. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a slide valve pump. The technical problem this invention aims to solve is to address the issues of oil leakage and poor reliability in existing slide valve pumps due to their belt-driven structure.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A slide valve pump includes a pump body, a pump shaft rotatably mounted inside the pump body, and a motor mounted on the pump body. Bearings and oil seals are respectively provided at both ends of the pump shaft and between the pump body. The pump body and the motor form a sealed chamber at their connection point. One end of the pump shaft extends into the chamber and is connected to the output shaft of the motor via a rigid coupling. The other end of the pump shaft extends out of the pump body and is fitted with a balance wheel. A wheel cover is provided around the balance wheel, and the wheel cover is connected to the pump body, forming a sealed oil storage chamber between the wheel cover and the pump body. The oil storage chamber is connected to the air inlet of the pump body via a return oil pipe.

[0007] The pump shaft of this slide valve pump is directly connected to the motor via a rigid coupling, reducing transmission components, lowering the failure rate, and improving the reliability of the pump. Furthermore, the connection between the pump body and the motor forms a sealed chamber, eliminating the risk of oil leakage associated with existing belt-driven systems. More importantly, this slide valve pump forms a sealed oil storage chamber between the pump body and the wheel cover surrounding the balance wheel. A return oil pipe connects the oil storage chamber to the pump body's air inlet, utilizing the negative pressure suction at the pump body's air inlet as a driving force. This allows leaked oil in the storage chamber to be actively drawn back into the pump body, achieving oil recovery and reuse. This solves the problems of oil leakage and poor reliability caused by the belt-driven structure of existing slide valve pumps.

[0008] In the aforementioned slide valve pump, the wheel cover includes a first housing connected to the pump body and a second housing connected to the first housing. The oil return pipe is connected to the bottom of the second housing, and a sealing ring is provided at the connection between the first housing and the second housing. This wheel cover structure facilitates the assembly and disassembly of the balance wheel, and the sealing ring improves the sealing performance at the connection between the first housing and the second housing, preventing oil leakage from this connection.

[0009] In one of the aforementioned slide valve pumps, a filter is installed on the return oil pipe. The filter removes impurities and particulate matter from the leaked oil, ensuring the cleanliness of the recovered oil, protecting the pump's internal components from wear, and extending the service life and reliability of the slide valve pump.

[0010] In the aforementioned slide valve pump, a solenoid valve for controlling the on / off state is also installed on the return oil pipe. The solenoid valve is located between the filter and the air inlet of the pump body. When the leakage oil in the oil storage chamber is small, the return oil pipe can be closed by the solenoid valve. When the leakage oil in the oil storage chamber is large, the return oil pipe can be opened by the solenoid valve, so that the leakage oil in the oil storage chamber is always within a reasonable range.

[0011] In the aforementioned slide valve pump, a cooling water jacket is installed on the motor, forming a sealed liquid storage chamber between the cooling water jacket and the motor. The cooling water jacket has an inlet and an outlet. During use, the inlet and outlet of the cooling water jacket are connected to a cooling water tank via pipelines. A water pump circulates the coolant between the cooling water tank and the cooling water jacket. This cooling water jacket structure ensures efficient motor cooling through a "cooling water inlet - cooling water outlet" circulation path. Simultaneously, the conduction of cold air reduces heat at the pump shaft oil seal, extending its service life. This effectively solves the problems of oil leakage and poor reliability in existing slide valve pumps caused by belt-driven structures.

[0012] Compared with existing technologies, the advantages of this slide valve pump are as follows: The pump shaft of this slide valve pump is directly connected to the motor through a rigid coupling, reducing transmission components, lowering the failure rate, and improving the reliability of the slide valve pump. In addition, the connection between the pump body and the motor forms a sealed chamber, thereby eliminating the risk of oil leakage caused by existing belt pulley drives. More importantly, this slide valve pump forms a sealed oil storage chamber between the wheel cover covering the balance wheel and the pump body, and connects the oil storage chamber and the air inlet of the pump body through a return oil pipe. By using the negative pressure suction of the air inlet of the pump body as the driving force, the leaked oil in the oil storage chamber can be actively sucked back into the pump body, realizing the recycling of the leaked oil in the oil storage chamber, thereby solving the problems of oil leakage and poor reliability caused by the belt pulley drive structure of existing slide valve pumps. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the slide valve pump.

[0014] In the diagram, 1. Pump body; 1a. Air inlet; 2. Pump shaft; 3. Motor; 3a. Output shaft; 4. Rigid coupling; 5. Balance wheel; 6. Wheel cover; 6a. First housing; 6b. Second housing; 7. Oil storage chamber; 8. Oil return pipe; 9. Sealing ring; 10. Filter; 11. Solenoid valve; 12. Cooling water jacket; 12a. Liquid inlet; 12b. Liquid outlet; 13. Liquid storage chamber; 14. Chamber. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] A slide valve pump, reference Figure 1The system includes a pump body 1, a pump shaft 2 rotatably mounted within the pump body 1, and a motor 3 mounted on the pump body 1. Bearings and oil seals are respectively installed at both ends of the pump shaft 2 and the pump body 1. The connection between the pump body 1 and the motor 3 forms a sealed chamber 14. One end of the pump shaft 2 extends into the chamber 14 and is connected to the output shaft 3a of the motor 3 via a rigid coupling 4. The other end of the pump shaft 2 extends out of the pump body 1 and is fitted with a balance wheel 5. The balance wheel 5 is covered by a wheel cover 6, which is connected to the pump body 1 and forms a sealed oil storage chamber 7 between the wheel cover 6 and the pump body 1. The oil storage chamber 7 is connected to the air inlet 1a of the pump body 1 via a return oil pipe 8. In this embodiment, the motor 3 is preferably a variable frequency motor, which can adjust the output power in real time according to the load demand, reducing energy consumption. Simultaneously, it reduces the impact of oil on the oil seal, further suppressing the risk of leakage.

[0017] Reference Figure 1 Specifically, the wheel cover 6 includes a first housing 6a connected to the pump body 1 and a second housing 6b connected to the first housing 6a. The oil return pipe 8 is connected to the bottom of the second housing 6b, and a sealing ring 9 is provided at the connection between the first housing 6a and the second housing 6b. In this embodiment, the first housing 6a and the second housing 6b are preferably connected by bolts for detachment.

[0018] Reference Figure 1 Furthermore, a filter 10 is provided on the oil return pipe 8; a solenoid valve 11 for controlling the on / off state is also provided on the oil return pipe 8, and the solenoid valve 11 is located between the filter 10 and the air inlet 1a of the pump body 1.

[0019] Reference Figure 1 Furthermore, the motor 3 is provided with a cooling water jacket 12, and a sealed liquid storage chamber 13 is formed between the cooling water jacket 12 and the motor 3. The cooling water jacket 12 has a liquid inlet 12a and a liquid outlet 12b.

[0020] When the slide valve pump is running, the pressure at its air inlet 1a is lower than atmospheric pressure, forming a negative pressure state. This slide valve pump forms a sealed oil storage chamber 7 between the wheel cover covering the balance wheel and the pump body. The oil storage chamber 7 and the air inlet 1a of the pump body 1 are connected by a return oil pipe 8. The negative pressure suction of the air inlet 1a of the pump body 1 is used as the driving force, without the need for an additional power device. This allows the leaked oil in the oil storage chamber 7 to be actively sucked back into the pump body 1, realizing the recycling of the leaked oil in the oil storage chamber 7. In addition, the connection between the pump body 1 and the motor 3 also forms a sealed chamber 14, which can also prevent the leaked oil from entering the external environment. This solves the problems of oil leakage and poor reliability caused by the belt pulley drive structure of existing slide valve pumps.

[0021] It should be noted that the space between the pump body 1 and the motor 3 is relatively small, and the amount of leaked oil on this side is small and confined within the enclosed space between the pump body 1 and the motor 3, so it will not leak out and pollute the environment. However, the space of the oil storage chamber 7 is relatively large, so when the amount of leaked oil in the oil storage chamber 7 is large, it needs to be recycled in time.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A slide valve pump, comprising a pump body (1), a pump shaft (2) rotatably disposed within the pump body (1), and a motor (3) mounted on the pump body (1), wherein bearings and oil seals are respectively provided at both ends of the pump shaft (2) and the pump body (1), characterized in that, The connection between the pump body (1) and the motor (3) forms a sealed chamber (14). One end of the pump shaft (2) extends into the chamber (14) and is connected to the output shaft (3a) of the motor (3) through a rigid coupling (4). The other end of the pump shaft (2) extends out of the pump body (1) and is fitted with a balance wheel (5). The balance wheel (5) is covered with a wheel cover (6). The wheel cover (6) is connected to the pump body (1) and forms a sealed oil storage chamber (7) between the pump body (1) and the pump body (1). The oil storage chamber (7) is connected to the air inlet (1a) of the pump body (1) through a return oil pipe (8).

2. A slide valve pump according to claim 1, characterized in that, The wheel cover (6) includes a first housing (6a) connected to the pump body (1) and a second housing (6b) connected to the first housing (6a). The oil return pipe (8) is connected to the bottom of the second housing (6b). A sealing ring (9) is provided at the connection between the first housing (6a) and the second housing (6b).

3. A slide valve pump according to claim 1, characterized in that, A filter (10) is installed on the return oil pipe (8).

4. A slide valve pump according to claim 3, characterized in that, The return oil pipe (8) is also equipped with a solenoid valve (11) for controlling the on / off state. The solenoid valve (11) is located between the filter (10) and the air inlet (1a) of the pump body (1).

5. A slide valve pump according to claim 1, 2, 3, or 4, characterized in that, The motor (3) is provided with a cooling water jacket (12), and a closed liquid storage chamber (13) is formed between the cooling water jacket (12) and the motor (3). The cooling water jacket (12) has an inlet (12a) and an outlet (12b).

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