An oil and gas recovery vacuum pump and oil dispenser with a rotary valve switching the air flow direction

Abstract

The present invention discloses an oil and gas recovery vacuum pump and a refueling machine with a rotary valve for switching the airflow direction. The vacuum pump comprises a power unit, an air distribution disk, a cover plate, a conversion valve, a stator, a rotor and other components. Even when the rotation direction of the motor is unknown, the airflow direction can be switched by turning the conversion valve, so that the structure of the present solution can be applied to motors with different directions without prior customization, and the use is flexible and reliable.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas recovery vacuum pumps, and in particular relates to an oil and gas recovery vacuum pump and a refueling machine with a rotary valve switching the flow direction of an airflow. Background Art

[0002] The oil and gas recovery technology of fuel dispensers is a new energy-saving and environmentally friendly technology. It uses oil and gas recovery technology to recover the oil and gas emitted during the storage, transportation and loading and unloading of oil products, prevent air pollution caused by oil and gas volatilization, and eliminate safety hazards. Its main idea is to improve the utilization rate of energy, reduce economic losses, and thus obtain considerable benefits in return.

[0003] However, the oil and gas recovery vacuum pump structure in the prior art is unidirectional. When the oil and gas recovery vacuum pump and the motor are installed reversely, that is, the motor direction is opposite to the preset direction, oil and gas backflow will occur, which will damage the oil and gas vacuum pump itself and other related equipment. Most of the existing vacuum pump supporting components cannot be temporarily adjusted according to the motor direction, that is, customized parts. Therefore, this also makes it difficult to immediately adapt to the situation of the old motor when assembling the vacuum pump. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an oil and gas recovery vacuum pump and a refueling machine which use a flexible and reliable rotary valve to switch the direction of air flow.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An oil and gas recovery vacuum pump with a rotary valve switching the airflow direction is connected in a fuel dispenser and used to provide the negative pressure required for the fuel dispenser to recover oil and gas, and comprises:

[0007] The power unit is the power source for generating the negative pressure required for the tanker to recover oil and gas;

[0008] A gas distribution plate, a first joint and a second joint are fixed on both sides of the gas distribution plate, a first sink groove and a second sink groove are provided on the lower end surface of the gas distribution plate, a circular concave cavity is provided at the center of the upper end surface of the gas distribution plate, and a first through hole and a second through hole are provided on the inner wall of the concave cavity, the first through hole is connected to the first sink groove, and the second through hole is connected to the second sink groove, and a first flow groove and a second flow groove are provided on the upper end surface of the gas distribution plate, one end of the first flow groove and the second flow groove are arranged oppositely and extend to the inner wall of the concave cavity respectively, the other end of the first flow groove extends to the first joint, and the other end of the second flow groove extends to the second joint;

[0009] A cover plate is arranged on the upper end surface of the gas distribution plate and covers the first flow channel and the second flow channel;

[0010] The conversion valve is adapted to the shape of the concave cavity and is rotatably connected in the concave cavity. The conversion valve has a first channel and a second channel inside. Two ports of the first channel and the second channel extend to the side wall of the conversion valve respectively.

[0011] The stator is a cylindrical structure, one end of which is fixed to the lower end surface of the valve plate and surrounds the first sink groove and the second sink groove, and the other end is fixed to the upper end surface of the power unit;

[0012] The rotor is eccentrically connected to the inside of the stator and driven to rotate by the power unit. The upper end surface of the rotor abuts against the lower end surface of the valve plate, and the lower end surface of the rotor abuts against the upper end surface of the power unit. A plurality of slide grooves are arranged at intervals along the circumferential direction on the periphery of the rotor, and a push plate is slidably connected in each slide groove. During the eccentric rotation of the rotor driven by the power unit, the push plate is extended by the centrifugal force and abuts against the inner wall of the stator, so that the air in the first trough is pushed into the second trough, or the air in the second trough is pushed into the first trough.

[0013] As a preferred embodiment, the power unit includes a motor and a reducer, the reducer includes a bracket cover, a base plate and a gear reduction mechanism, the bottom is fixedly connected to the upper end surface of the motor, the lower end of the bracket cover is fixedly connected to the upper end of the base plate, the upper end of the bracket cover is fixed to the lower end of the stator, and the gear reduction mechanism is placed in the space enclosed by the bracket cover and the base plate, and the output shaft of the motor drives the rotor to rotate through the gear reduction mechanism.

[0014] Furthermore, the gear reduction mechanism includes an input gear, a transition double gear and an output gear, the input gear is fixedly connected to the output shaft of the motor, the lower gear of the transition double gear is meshed with the input gear, the upper gear of the transition double gear is meshed with the output gear, and the output gear is fixedly connected to the rotating shaft of the rotor.

[0015] As a preferred embodiment, a rotating block is fixed on the upper end surface of the conversion valve, and two spaced-apart limiting blocks are fixed on the cover plate, and the rotating block moves between the two limiting blocks.

[0016] As a preferred embodiment, the end of the push plate away from the center of the rotor is an arc-shaped structure.

[0017] As a preferred embodiment, the first sink and the second sink are connected via a pressure relief valve.

[0018] As a preferred embodiment, the first joint and the second joint are respectively connected to a flame arrester.

[0019] A refueling machine comprises the oil and gas recovery vacuum pump described above.

[0020] The present invention adopts the above technical scheme, and compared with the prior art, it has the following beneficial effects: the rotor is driven to rotate eccentrically by the power unit, and the push plate is extended by the centrifugal force and abuts against the inner wall of the stator, so that the air in the first sink groove is pushed into the second sink groove (at this time, the first sink groove generates negative pressure, and the second sink groove generates positive pressure), or the air in the second sink groove is pushed into the first sink groove (at this time, the first sink groove generates positive pressure, and the second sink groove generates negative pressure). At the same time, the air distribution disk and the conversion valve cooperate to realize the output of airflow from the first joint or from the second joint. Even if the rotation direction of the motor is unknown, the switching of the airflow direction can be achieved by turning the conversion valve, so that the structure of the present scheme can be applicable to motors with different directions without prior customization, and it is flexible and reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

[0022] Figure 1 A perspective view of the present invention;

[0023] Figure 2 is a cross-sectional view of the present invention;

[0024] Figure 3 A cross-sectional view of the gas distribution panel, the conversion valve and the cover plate assembled together;

[0025] Figure 4 A top view of the gas distribution panel, conversion valve and cover plate assembled together;

[0026] Figure 5 The diagram is a schematic diagram of the gas distribution panel;

[0027] Figure 6 Schematic diagram of another angle of view of the gas distribution panel

[0028] Figure 7 is a schematic diagram of a gear reduction mechanism;

[0029] Figure 8 It is a schematic diagram of the coordination between the rotor and the stator;

[0030] Fig. 9 It is a horizontal cross-sectional view of the conversion valve and the gas distribution plate assembled together and in the initial state;

[0031] Fig.10 It is a horizontal cross-sectional view of the conversion valve and the gas distribution plate when they are assembled together and the conversion valve is rotated and switched;

[0032] Fig.11 Schematic diagram of adding a pressure relief valve to the gas distribution panel. DETAILED DESCRIPTION

[0033] like Figure 1-10As shown in one of the figures, the present invention is an oil and gas recovery vacuum pump with a rotary valve switching the air flow direction, which is connected in a fuel dispenser and is used to provide the negative pressure required for the fuel dispenser to recover oil and gas, and specifically includes:

[0034] Power unit 1, a power source for generating the negative pressure required for the tanker to recover oil and gas;

[0035] A gas distribution plate 2, with a first joint 3 and a second joint 4 fixed on both sides of the gas distribution plate 2, a first sink 21 and a second sink 22 are respectively provided on the lower end surface of the gas distribution plate 2, a circular concave cavity 23 is provided at the center of the upper end surface of the gas distribution plate 2, and a first through hole 24 and a second through hole 25 are provided on the inner wall of the concave cavity 23, the first through hole 24 is connected to the first sink 21, and the second through hole 25 is connected to the second sink 22, and a first flow groove 26 and a second flow groove 27 are symmetrically provided on the upper end surface of the gas distribution plate 2, one end of the first flow groove 26 and the second flow groove 27 are oppositely arranged and respectively extend to the inner wall of the concave cavity 23, the other end of the first flow groove 26 extends to the first joint 3, and the other end of the second flow groove 27 extends to the second joint 4;

[0036] The cover plate 4 is arranged on the upper end surface of the gas distribution plate 2 and covers the first flow groove 26 and the second flow groove 27;

[0037] The conversion valve 5 is adapted to the shape of the concave cavity 23 and is rotatably connected to the concave cavity 23. The conversion valve 5 has a first channel 51 and a second channel 52 (the first channel 51 and the second channel 52 are centrally symmetrical). The two ends of the first channel 51 and the second channel 52 extend to the side walls of the conversion valve 5 respectively.

[0038] The stator 6 is a cylindrical structure, one end of which is fixed to the lower end surface of the gas distribution plate 2 and surrounds the first sink 21 and the second sink 22, and the other end is fixed to the upper end surface of the power unit 1;

[0039] The rotor 7 is eccentrically connected to the inside of the stator 6 and driven to rotate by the power unit 1. The upper end surface of the rotor 7 abuts against the lower end surface of the valve plate 2, and the lower end surface of the rotor 7 abuts against the upper end surface of the power unit 1. The periphery of the rotor 7 is provided with a plurality of slide grooves at intervals in the circumferential direction, and a push plate 8 is slidably connected in each slide groove. During the eccentric rotation of the rotor 7 driven by the power unit 1, the push plate 8 is extended by the centrifugal force and abuts against the inner wall of the stator 6, so that the air in the first trough 21 is pushed into the second trough 22, or the air in the second trough 22 is pushed into the first trough 21.

[0040] Among them, as an implementation method of the power unit 1, in this embodiment, the power unit 1 includes a motor 11 and a reducer 12, the reducer 12 includes a bracket cover 121, a base plate 122 and a gear reduction mechanism 123, the bottom is fixedly connected to the upper end surface of the motor 11, the lower end of the bracket cover 121 is fixedly connected to the upper end of the base plate 122, the upper end of the bracket cover 121 is fixed to the lower end of the stator 6, the gear reduction mechanism 123 is placed in the space enclosed by the bracket cover 121 and the base plate 122, and the output shaft of the motor 11 drives the rotor 7 to rotate through the gear reduction mechanism 123. Among them, the gear reduction mechanism 123 includes an input gear 1231, a transition double gear 1232 and an output gear 1233, the input gear 1231 is fixedly connected to the output shaft of the motor 11, the lower gear of the transition double gear 1232 is meshed with the input gear 1231, the upper gear of the transition double gear 1232 is meshed with the output gear 1233, and the output gear 1233 is fixedly connected to the rotating shaft of the rotor 7.

[0041] In order to facilitate the rotation of the conversion valve 5 to a predetermined position for switching, a rotating block 8 is fixed on the upper end surface of the conversion valve 5, and two spaced-apart limit blocks 9 are fixed on the cover plate 4. The rotating block 8 moves between the two limit blocks 9, and when the rotating block 8 touches different limit blocks 9, the switching of the airflow direction can be achieved.

[0042] In order to ensure air tightness, the end of the push plate 8 away from the center of the rotor 7 is an arc-shaped structure, which can ensure that the push plate 8 maintains a dynamic seal with the inner wall of the stator 6 during the rotation process.

[0043] In actual use, in order to ensure safety, flame arresters are provided on the first joint 3 and the second joint 4.

[0044] In order to improve the sealing performance of the entire vacuum pump, sealing members 33 such as sealing rings or oil seals may be added at places prone to leakage.

[0045] Working principle of the present invention:

[0046] by Fig. 9The state is the initial state (at this time, the two ports of the first channel 51 are connected to the first through hole 24 and the first flow groove 26 respectively, and the two ports of the second channel 52 are connected to the second through hole 25 and the second flow groove 27 respectively), the motor 11 drives the rotor 7 to rotate eccentrically through the reducer 12, and the push plate 8 is extended by the centrifugal force and abuts against the inner wall of the stator 6, so that the air in the first sink 21 is pushed into the second sink 22 (at this time, the first sink 21 generates negative pressure and inhales air, and the second sink 22 generates positive pressure and exhausts air), so that the flow direction of the airflow inside the vacuum pump is: first joint 3→first flow groove 26→first channel 51→first through hole 24→first sink 21→second sink 22→second through hole 25→second channel 52→second flow groove 27→second joint 4. In addition, Fig.11 As shown, the function of the pressure relief valve 28 is that when the second trough 22 is isolated from the first trough 21, the gas in the first trough 21 begins to be compressed and the volume gradually decreases. When the compressed gas exceeds the threshold of the pressure relief valve, the pressure relief valve is pushed open by the compressed gas, and the gas passes through part of it and is sent back to the second trough 22, so as to avoid deformation of the stator due to excessive pressure or other adverse operating conditions.

[0047] When you want to change the airflow direction, Fig.10 As shown, the conversion valve 5 is rotated 90° so that the two ports of the first channel 51 are switched to be connected with the first flow groove 26 and the second through hole 25 respectively, and the two ports of the second channel 52 are switched to be connected with the second flow groove 27 and the first through hole 24 respectively. At this time, the flow direction of the airflow inside the vacuum pump is changed to: second joint 4→second flow groove 27→second channel 52→first through hole 24→first trough 21→second trough 22→second through hole 25→first channel 51→first flow groove 26→first joint 3.

[0048] If the motor 11 rotates in the reverse direction, the direction of the airflow is just opposite to the above, and the specific process will not be repeated.

[0049] The present invention relies on the innovative air duct structure inside the gas distribution disk 2 and the conversion valve, so that even if the rotation direction of the motor 11 is unknown, the airflow direction can be switched by turning the conversion valve 5, so that the structure of this scheme can be applicable to motors 11 with different directions without prior customization, and it is flexible and reliable to use.

[0050] The implementation of the present invention is described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are illustrative rather than limiting the present invention. Those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An oil and gas recovery vacuum pump with a rotary valve switching the airflow direction, connected in a fuel dispenser and used to provide the negative pressure required for the fuel dispenser to recover oil and gas, characterized in that: It includes: The power unit is the power source for generating the negative pressure required for the tanker to recover oil and gas; A gas distribution plate, a first joint and a second joint are fixed on both sides of the gas distribution plate, a first sink groove and a second sink groove are provided on the lower end surface of the gas distribution plate, a circular concave cavity is provided at the center of the upper end surface of the gas distribution plate, and a first through hole and a second through hole are provided on the inner wall of the concave cavity, the first through hole is connected to the first sink groove, and the second through hole is connected to the second sink groove, and a first flow groove and a second flow groove are provided on the upper end surface of the gas distribution plate, one end of the first flow groove and the second flow groove are arranged oppositely and extend to the inner wall of the concave cavity respectively, the other end of the first flow groove extends to the first joint, and the other end of the second flow groove extends to the second joint; A cover plate is arranged on the upper end surface of the gas distribution plate and covers the first flow channel and the second flow channel; The conversion valve is adapted to the shape of the concave cavity and is rotatably connected in the concave cavity. The conversion valve has a first channel and a second channel inside. Two ports of the first channel and the second channel extend to the side wall of the conversion valve respectively. The stator is a cylindrical structure, one end of which is fixed to the lower end surface of the valve plate and surrounds the first sink groove and the second sink groove, and the other end is fixed to the upper end surface of the power unit; The rotor is eccentrically connected to the inside of the stator and driven to rotate by the power unit. The upper end surface of the rotor abuts against the lower end surface of the valve plate, and the lower end surface of the rotor abuts against the upper end surface of the power unit. The periphery of the rotor is provided with a plurality of slide grooves at intervals in the circumferential direction, and a push plate is slidably connected in each slide groove. When the power unit drives the rotor to rotate eccentrically, the push plate is extended by the centrifugal force and abuts against the inner wall of the stator, so that the air in the first sink groove is pushed into the second sink groove, or the air in the second sink groove is pushed into the first sink groove. A rotating block is fixed on the upper end surface of the conversion valve, and two spaced-apart limit blocks are fixed on the cover plate, and the rotating block moves between the two limit blocks; The end of the push plate away from the center of the rotor is an arc-shaped structure.

2. The oil and gas recovery vacuum pump with a rotary valve switching the airflow direction according to claim 1, characterized in that: The power unit includes a motor and a reducer, the reducer includes a bracket cover, a base plate and a gear reduction mechanism, the bottom is fixedly connected to the upper end surface of the motor, the lower end of the bracket cover is fixedly connected to the upper end of the base plate, the upper end of the bracket cover is fixed to the lower end of the stator, the gear reduction mechanism is placed in the space enclosed by the bracket cover and the base plate, and the output shaft of the motor drives the rotor to rotate through the gear reduction mechanism.

3. The oil and gas recovery vacuum pump with a rotary valve switching the airflow direction according to claim 2, characterized in that: The gear reduction mechanism includes an input gear, a transition double gear and an output gear. The input gear is fixedly connected to the output shaft of the motor, the lower gear of the transition double gear is meshed with the input gear, the upper gear of the transition double gear is meshed with the output gear, and the output gear is fixedly connected to the rotating shaft of the rotor.

4. The oil vapor recovery vacuum pump with a rotary valve switching the air flow direction according to claim 1, characterized in that: The first sink and the second sink are also connected via a pressure relief valve.

5. The oil and gas recovery vacuum pump with a rotary valve switching the airflow direction according to claim 1, characterized in that: The first joint and the second joint are respectively connected with a flame arrester.

6. A fuel dispenser, characterized in that: It comprises the oil and gas recovery vacuum pump as claimed in any one of claims 1 to 5.

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