Methanol electromagnetic pump

Abstract

The utility model relates to the field of electromagnetic pumps, in particular to a methanol electromagnetic pump which comprises a shell, a cavity is formed in the shell, a first channel is formed in the top of the shell, a second channel is formed in the bottom of the shell, a pump body is arranged in the cavity, a first spring is arranged at the top end of the pump body, the first spring is connected with the top of the cavity, and a cavity is formed in the pump body in the radial direction. A plunger is arranged below the pump body, the top end of the plunger is inserted into the bottom of the cavity, a third channel is arranged in the plunger in the radial direction, the top end of the third channel is communicated with the cavity through a second one-way valve, a second spring is arranged below the second one-way valve, and a main spring is arranged at the bottom end of the plunger. The bottom end of the main spring is connected with the bottom end of the cavity, and the bottom end of the third channel communicates with the top end of the second channel. The methanol electromagnetic pump can be reliably sealed under both low pressure and high pressure, the use efficiency of the methanol electromagnetic pump is improved, and the service life of the methanol electromagnetic pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic pumps, and particularly relates to a methanol electromagnetic pump. Background Technique

[0002] As a new type of energy, methanol is currently widely used in various combustion occasions. As a liquid pressurization device for methanol fuel supply and transportation, a methanol pump is an essential component. Currently, there are dynamic pumps or kinetic pumps for methanol pumps, which rely on the rotation of the impeller to create the kinetic energy of the liquid to transport methanol. This type of pump has low efficiency, generally 20 - 30%, and a large volume. Its advantage is that the matching accuracy between the impeller and the pump body is very low, and it is easy to manufacture. Another type is a positive displacement pump, which has high efficiency and a small volume. A small electromagnetic plunger pump belongs to a positive displacement pump and is used in various small-flow occasions, such as small burners and cooking stoves. Its working principle is to rely on electromagnetic force to drive the plunger and the pump body to produce relative motion, causing the volume change of the pump cavity to transport the liquid. The disadvantage is that the manufacturing accuracy requirements are extremely high, especially the gap between the plunger and the cavity is very difficult to control.

[0003] Chinese Patent CN201620139902.8 discloses a "Methanol Pump". The methanol pump disclosed in this patent uses end face sealing, which is a sealing structure for the rotating end face, and does not mention the sealing of the plunger and the pump body; Chinese Patent CN202322248389.9 discloses an "Integrated Duct and Its Liquid Ultra-High Pressure Vertical Electromagnetic Plunger Pump", which solves the problem of avoiding leakage caused by high temperature by using an integrated duct without any rubber sealing rings; Chinese Patent CN202311659468.7 discloses a "Lightweight Iron Core Electromagnetic Pump", which solves the problems of high-temperature overload and self-cleaning of the electromagnetic pump. None of them mention solving the sealing problem between the plunger and the pump body. Chinese Patent CN202120884305.9 discloses a "Front Cover Device of an Electromagnetic Plunger Pump for SCR System", which proposes a sealing structure for the check valve of the electromagnetic pump. Chinese Patent CN202410407427.7 discloses a "Pulse Electromagnetic Pump", which solves the static sealing structure for preventing leakage when the electromagnetic pump is in a stopped state.

[0004] The existing methanol electromagnetic pumps have a short service life due to the characteristics of methanol. Firstly, the methanol molecule size is extremely small, only 0.43 nm, making it difficult to form boundary lubrication between the plunger and the mating pair, and it is extremely easy to cause wear. Once the plunger and the mating pair of the pump body are worn and the gap becomes larger, methanol causes internal leakage in the pump, the efficiency of the pump decreases, and the pump fails. Some manufacturers use "O" - rings for sealing. Due to the large sealing friction force, it is easy to wear and cause internal leakage. In addition, methanol is an organic solvent, which will cause swelling to the seals made of most organic elastic sealing materials, resulting in seal failure or mating jamming, causing the pump to not work properly. Due to these reasons, the problem of the life reliability of small - flow methanol pumps in China has not been solved. The methanol pump, as a basic component, is one of the key factors restricting the development of methanol application technology in China. Summary of the Invention

[0005] In view of the above problems, the present invention provides a methanol electromagnetic pump, which extends the service life of the methanol electromagnetic pump, enables the methanol pump to be reliably sealed under both low pressure and high pressure, and improves the use efficiency of the methanol electromagnetic pump.

[0006] To achieve the above object, the technical solution provided by the present invention is: a methanol electromagnetic pump, including a housing. There is a chamber inside the housing. A first channel is provided at the top of the housing, and a second channel is provided at the bottom of the housing. A pump body is provided inside the chamber. A first spring is provided at the top end of the pump body, and one end of the first spring is connected to the top of the chamber. A cavity is radially provided inside the pump body. The bottom of the cavity is communicated with the bottom end of the first channel through a first one - way valve. A plunger is provided below the pump body. The top end of the plunger is inserted into the bottom of the cavity. A third channel is radially provided inside the plunger. The top end of the third channel is communicated with the cavity through a second one - way valve. A second spring is provided below the second one - way valve. A main spring is provided at the bottom end of the plunger, and the bottom end of the main spring is connected to the bottom end of the chamber. The bottom end of the third channel is communicated with the top end of the second channel. A coil bracket is provided on the outer side of the housing in the horizontal direction of the plunger, and an electromagnetic coil is provided on the coil bracket. A lip seal is provided on the inner side of the bottom of the pump body, and the lip seal is sleeved on the plunger, and the plunger is in interference connection with the inner side of the lip seal.

[0007] As a further scheme of the present invention: both the pump body and the plunger are convex - shaped.

[0008] As a further scheme of the present invention: the lip seal adopts a shaft - used seal, and the lip seal includes a sealing ring and a spring. The sealing ring is provided with a U - shaped groove, and the spring is horizontally arranged in the U - shaped groove, and the opening direction of the U - shaped groove is the same as the direction of the first channel.

[0009] As a further solution of the present utility model: The sealing ring is made of alcohol-resistant material, preferably polytetrafluoroethylene or ultra-high molecular weight polyethylene, and the spring is a metal spring.

[0010] As a further solution of the present utility model: Lip edges are provided on both the inner and outer sides of the bottom of the sealing ring. The diameter of the inner lip edge at the bottom of the sealing ring is C, and the diameter of the top of the plunger is L. The inner lip edge of the sealing ring is in interference connection with the top of the plunger, and the interference amount is 2%-10%.

[0011] As a further solution of the present utility model: The interference amount between the inner lip edge of the sealing ring and the top of the plunger is the value of (L - C) * 100% / L.

[0012] As a further solution of the present utility model: A pantograph seal cover is provided at the bottom of the pantograph seal.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model uses a pantograph seal as the sealing element, overcoming the drawbacks brought by the previous gap sealing method relying solely on the plunger and the pump body. The pantograph seal has the characteristic of automatic inner diameter size compensation, which can automatically compensate for the slight wear of the plunger, extending the service life of the methanol electromagnetic pump. Since the pantograph seal is used for sealing, the plunger and the pump body do not require precise fitting, reducing the production precision requirements and improving the production efficiency.

[0015] 2. Through the setting of the interference amount between the plunger and the pantograph seal, the present utility model can achieve reliable sealing under both low-pressure and high-pressure conditions, greatly improving the use efficiency of the methanol electromagnetic pump. Brief Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall external structure of the present utility model;

[0017] Figure 2 is a sectional view of the internal structure of the present utility model;

[0018] Figure 3 is a top view of the external structure of the present utility model;

[0019] Figure 4 is a schematic diagram of the connection structure between the pump body and the plunger of the present utility model;

[0020] Figure 5 is an exploded view of the internal structure of the housing chamber of the present utility model;

[0021] Figure 6 is a schematic diagram of the pantograph seal structure of the present utility model;

[0022] In the figure: 1. Housing; 2. Chamber; 3. First channel; 4. Second channel; 5. Pump body; 6. First spring; 7. Cavity; 8. First check valve; 9. Plunger; 10. Third channel; 11. Second check valve; 12. Second spring; 13. Main spring; 14. Coil bracket; 15. Electromagnetic coil; 16. Ferrule seal; 17. Sealing ring; 18. Spring; 19. U-shaped groove; 20. Lip; 21. Ferrule seal cover. Detailed implementation manner

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Refer to Figures 1 to 6 , a methanol electromagnetic pump, including a housing 1, a chamber 2 is provided inside the housing 1, a first channel 3 is provided at the top of the housing 1, a second channel 4 is provided at the bottom of the housing 1, a pump body 5 is provided in the chamber 2, a first spring 6 is provided at the top end of the pump body 5, one end of the first spring 6 is connected to the top of the chamber 2, a cavity 7 is radially provided inside the pump body 5, the bottom of the cavity 7 is communicated with the bottom end of the first channel 3 through a first check valve 8, a plunger 9 is provided below the pump body 5, the top end of the plunger 9 is inserted into the bottom of the cavity 7, a third channel 10 is radially provided inside the plunger 9, the top end of the third channel 10 is communicated with the cavity 7 through a second check valve 11, a second spring 12 is provided below the second check valve 11, a main spring 13 is provided at the bottom end of the plunger 9, the bottom end of the main spring 13 is connected to the bottom end of the chamber 2, the bottom end of the third channel 10 is communicated with the top end of the second channel 4, a coil bracket 14 is provided on the outside of the housing 1 in the horizontal direction of the plunger 9, an electromagnetic coil 15 is provided on the coil bracket 14, a ferrule seal 16 is provided on the inner side of the bottom of the pump body 5, the ferrule seal 16 is sleeved on the plunger 9, and the plunger 9 is in interference connection with the inner side of the ferrule seal 16.

[0025] Both the pump body 5 and the plunger 9 are convex-shaped.

[0026] The ferrule seal 16 adopts a shaft seal, and the ferrule seal 16 includes a sealing ring 17 and a spring 18. The sealing ring 17 is provided with a U-shaped groove 19, and the spring 18 is horizontally arranged in the U-shaped groove 19. The opening direction of the U-shaped groove 19 is the same as the direction of the first channel 3.

[0027] The sealing ring 17 is made of alcohol-resistant material, preferably polytetrafluoroethylene or ultra-high molecular weight polyethylene, and the spring 18 is a metal spring.

[0028] Both the inner and outer sides of the bottom of the sealing ring 17 are provided with lips 20. The diameter of the inner lip 20 at the bottom of the sealing ring 17 is C, and the diameter of the top of the plunger 9 is L. The inner lip 20 of the sealing ring 17 is in interference fit with the top of the plunger 9, and the interference amount is 2% - 10%.

[0029] The interference amount between the inner lip 20 of the sealing ring 17 and the top of the plunger 9 is the value of (L - C) * 100% / L.

[0030] A pantograph seal retainer 21 is provided at the bottom of the pantograph seal 16.

[0031] Working process: When the methanol electromagnetic pump works, a pulsed voltage is applied, the electromagnetic coil 15 is energized to generate a magnetic field, and the plunger 9 moves towards the second channel 4 under the drive of the electromagnetic force. The plunger 9 compresses the main spring 13. At this time, the volume of the cavity 7 increases, and methanol enters the cavity 7 through the second channel 4 and the third channel 10, passing through the second spring 12 and the second one-way valve 11; when the electromagnetic coil 15 is de-energized, the elastic kinetic energy of the compressed main spring 13 is released, driving the plunger 9 to move towards the first channel 3, and delivering the methanol entering the cavity 7 to the first channel 3 through the first one-way valve 8, and so on in a cycle.

[0032] When the methanol in the cavity 7 enters the sealing ring 17 of the pantograph seal 16, the inner side of the pantograph seal 16 is pressed towards the outer diameter surface of the plunger 9 by the liquid pressure. Therefore, when the methanol electromagnetic pump works at low pressure, the seal between the pantograph seal 16 and the plunger 9 is achieved by the interference between the lip 20 of the pantograph seal 16 and the plunger 9; when working at high pressure, the pressure generated by the methanol liquid on the inner side of the pantograph seal 16 will make the seal more reliable. Therefore, it can be applied whether working at high pressure or low pressure.

[0033] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A methanol electromagnetic pump, comprising a housing (1), wherein a chamber (2) is provided inside the housing (1), a first channel (3) is provided at the top of the housing (1), a second channel (4) is provided at the bottom of the housing (1), a pump body (5) is provided inside the chamber (2), a first spring (6) is provided at the top of the pump body (5), one end of the first spring (6) is connected to the top of the chamber (2), a cavity (7) is radially provided inside the pump body (5), the bottom of the cavity (7) is connected to the bottom end of the first channel (3) through a first one-way valve (8), a plunger (9) is provided below the pump body (5), the top end of the plunger (9) is inserted into the cavity, and the bottom of the plunger (9) is connected to the bottom end of the first channel (3) through a first one-way valve (8). The bottom of the cavity (7) is provided with a third channel (10) radially inside the plunger (9), the top end of the third channel (10) is communicated with the cavity (7) through a second one-way valve (11), a second spring (12) is provided below the second one-way valve (11), a main spring (13) is provided at the bottom end of the plunger (9), the bottom end of the main spring (13) is connected to the bottom end of the cavity (2), the bottom end of the third channel (10) is communicated with the top end of the second channel (4), the outer side of the housing (1) is provided with a coil support (14) in a horizontal direction with the plunger (9), and an electromagnetic coil (15) is provided on the coil support (14), characterized in that: A pan seal (16) is provided on the inner side of the bottom of the pump body (5); the pan seal (16) is sleeved on the plunger (9); the plunger (9) is interference-connected with the inner side of the pan seal (16).

2. The methanol electromagnetic pump according to claim 1, characterized in that: The pump body (5) and the plunger (9) are both convex-shaped.

3. The methanol electromagnetic pump according to claim 2, characterized in that: The pan-seal (16) is a shaft seal. The pan-seal (16) comprises a sealing ring (17) and a spring (18). The sealing ring (17) is provided with a U-shaped groove (19). The spring (18) is transversely arranged in the U-shaped groove (19). The opening direction of the U-shaped groove (19) is the same as the direction of the first channel (3).

4. The methanol electromagnetic pump according to claim 3, characterized in that: The sealing ring (17) is made of an alcohol-resistant material, and the spring (18) is a metal spring.

5. The methanol electromagnetic pump according to claim 4, characterized in that: The inner and outer sides of the bottom of the sealing ring (17) are both provided with lips (20), the diameter of the inner lip (20) of the bottom of the sealing ring (17) is C, the diameter of the top of the plunger (9) is L, and the inner lip (20) of the sealing ring (17) is in interference connection with the top of the plunger (9), with the interference amount being 2%-10%.

6. The methanol electromagnetic pump according to claim 5, characterized in that: The interference between the inner lip (20) of the sealing ring (17) and the top of the plunger (9) is (LC)*100% / L.

7. The methanol electromagnetic pump according to claim 6, characterized in that: A flood seal stopper cover (21) is provided at the bottom of the flood seal (16).

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