A low-temperature electromagnetic booster pump for natural gas cylinder supply system

Abstract

The present invention discloses a low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system. The pump comprises a fully enclosed pump body, a working chamber disposed within the pump body, a movable iron core disposed within the working chamber, and a sidewall of the movable iron core capable of being movably sealed against the sidewalls of the working chamber, thereby dividing the working chamber into a first movable chamber located between the front end wall of the pump body and the movable iron core, and a second movable chamber located between the movable iron core and the rear end wall of the pump body. A compression spring is disposed in the second movable chamber between the rear end of the movable iron core and the rear end wall of the pump body, the compression spring capable of pushing the movable iron core forward. A drive device is disposed within the pump body capable of driving the movable iron core backward under the action of electromagnetic force. Liquid channels are disposed on the front end wall of the pump body, the movable iron core, and the rear end wall of the pump body, respectively, along with sealing devices capable of opening or closing the corresponding liquid channels. The booster pump can vaporize liquefied natural gas in a natural gas cylinder at a low liquid level while still meeting the pressure requirements for use in a gas engine.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas cylinder gas supply, and in particular to a booster pump capable of increasing the pressure in a natural gas cylinder. Background Art

[0002] The method for supplying gas to the engine in a natural gas vehicle is as follows: liquefied natural gas (LNG) in a natural gas cylinder is vaporized through a gas supply system and then supplied to the gas engine. The inner cylinder of a natural gas cylinder containing LNG contains a liquid phase and a gas phase, with the gas phase located above the liquid phase. Because the pressure of the natural gas discharged from the cylinder must meet the pressure range required for gas engines, the natural gas cylinder supply system is equipped with a booster pipeline, which includes a booster vaporizer. Common booster pipelines include a booster liquid inlet pipe with an inlet connected to the liquid phase and an outlet connected to the booster vaporizer, and a booster return pipe with an inlet connected to the booster vaporizer and an outlet connected to the gas phase. When boosting is required, the LNG in the liquid phase enters the booster vaporizer through the booster liquid inlet pipe for vaporization. The vaporized natural gas then enters the gas phase through the booster return pipe, thereby increasing the pressure in the natural gas cylinder's inner cylinder.

[0003] This type of natural gas cylinder supply system with a booster line has the following drawback: when the liquefied natural gas (LNG) level in the cylinder is low—that is, when it drops below 30% of the rated standard level—the LNG in the cylinder cannot be discharged into the booster inlet pipe via the natural level difference. Consequently, the gas phase cannot be pressurized through the booster line, resulting in the natural gas supply to the gas engine not meeting the required pressure. This drawback can be addressed by including a booster pump in the natural gas cylinder supply system. Since the natural gas cylinder supply system is installed in a natural gas vehicle, the voltage of the vehicle's onboard power supply typically ranges from 24 to 48V. Due to the limited installation space of the natural gas vehicle, the low temperature of LNG, and the flammable and explosive nature of natural gas, the booster pump needs to have the following characteristics: small size, light weight, stable operation at temperatures as low as -196°C, low leakage, and the ability to operate from the vehicle's onboard power supply to facilitate timely pressurization of the natural gas cylinder supply system. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-temperature electromagnetic booster pump that can operate stably at low temperatures in the natural gas supply system of a natural gas vehicle, and can ensure that the liquefied natural gas in a natural gas cylinder in a low liquid level state can still reach the pressure required for use in a gas engine after vaporization, so that the gas supply system of the natural gas cylinder equipped with the low-temperature electromagnetic booster pump can be safely and stably pressurized.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a low-temperature electromagnetic booster pump for a natural gas cylinder supply system, comprising: a pump body that is closed on all sides, a working chamber is provided in the pump body, and the characteristic is that: a moving iron core is provided in the working chamber, and the side wall of the moving iron core can be movably sealed with the side wall of the working chamber, so that the working chamber is divided into a first active chamber located between the front end wall of the pump body and the moving iron core, and a second active chamber located between the moving iron core and the rear end wall of the pump body; a compression spring is provided in the second active chamber between the rear end of the moving iron core and the rear end wall of the pump body, the compression spring can push the moving iron core forward, and a driving device that can drive the moving iron core to move backward under the action of electromagnetic force is provided outside the pump body, and liquid channels are respectively provided on the front end wall of the pump body, the moving iron core, and the rear end wall of the pump body, and a sealing device that can open or close the corresponding liquid channel is respectively provided on the front end wall of the pump body, the moving iron core, and the rear end wall of the pump body; the structure of the pump body, the driving device, the moving iron core, the liquid channel, and the sealing device meets The following requirements are provided: when the driving device is energized, the moving iron core moves backward along the side wall of the working chamber under the action of the electromagnetic force of the driving device, so that the liquid channel on the front end wall of the pump body is opened, and the liquefied natural gas can enter the first active chamber through the liquid channel on the front end wall of the pump body. During this process, the sealing devices on the moving iron core and the rear end wall of the pump body always close the corresponding liquid channels respectively; when the driving device is de-energized, the moving iron core moves forward along the side wall of the working chamber under the action of the compression spring, so that the liquid channel on the front end wall of the pump body is closed, the liquid channel on the moving iron core is opened, and part of the liquefied natural gas in the first active chamber enters the second active chamber through the liquid channel on the moving iron core, so that the liquefied natural gas in the second active chamber is pressurized, and then the liquid channel on the rear end wall of the pump body is opened, and part of the liquefied natural gas in the second active chamber is discharged through the liquid channel on the rear end wall of the pump body. When the moving iron core moves forward and resets, each sealing device closes the corresponding liquid channel respectively.

[0006] Furthermore, the aforementioned low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system, wherein: the rear end of the hollow moving iron core is open, a liquid channel and a matching sealing device are provided on the front end wall of the moving iron core, and the rear end wall of the moving iron core is connected to the rear end wall of the pump body by a compression spring; the first active cavity is located between the front end wall of the pump body and the front end wall of the moving iron core, and the second active cavity is located between the front end wall of the moving iron core and the rear end wall of the pump body, and the second active cavity contains the inner cavity of the moving iron core.

[0007] Furthermore, the aforementioned low-temperature electromagnetic booster pump is used in a natural gas cylinder supply system, wherein: two circumferential sealing grooves are provided on the side wall of the moving iron core at intervals in front and back, a sealing ring is provided in each circumferential sealing groove, and the side wall of the working chamber and the side wall of the moving iron core are sealed by the two sealing rings.

[0008] Furthermore, the aforementioned low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system, wherein: the pump body comprises: a tubular pump body with open front and rear ends, a locking nut 1 with an open rear end extending into the front section of the pump body, and the side wall of the locking nut 1 extending into the front section of the pump body is fixedly sealed and connected to the inner side wall of the front section of the pump body, a locking nut 2 with an open rear end extending into the rear section of the pump body, and the side wall of the locking nut 2 extending into the rear section of the pump body is fixedly sealed and connected to the inner side wall of the rear section of the pump body; a liquid channel is provided on the front end wall of the locking nut 1, and the locking nut 1 is fixedly sealed and connected to the inner side wall of the rear section of the pump body; The front end wall is the front end wall of the pump body, and a liquid channel is provided on the front end wall of the locking nut 2. The front end wall of the locking nut 2 is the rear end wall of the pump body. The side wall of the moving iron core is movably sealed with the inner side wall of the middle section of the pump body located between the rear end wall of the locking nut 1 and the front end wall of the locking nut 2. When the moving iron core moves forward and resets, the front end wall of the moving iron core rests on the rear end wall of the locking nut 1; the inner cavity of the locking nut 1 is connected with the inner cavity of the pump body through the opening at its rear end, so that the inner cavity of the locking nut 1 and the inner cavity of the middle section of the pump body cooperate to form a working cavity, and the first movable cavity contains the inner cavity of the locking nut 1.

[0009] Furthermore, the aforementioned low-temperature electromagnetic booster pump used in a natural gas cylinder supply system, wherein: the locking nut 1 is threadedly sealed connected to the front section of the pump body, and the locking nut 2 is threadedly sealed connected to the rear section of the pump body.

[0010] Furthermore, the aforementioned low-temperature electromagnetic booster pump is used in a natural gas cylinder supply system, wherein: the diameter of the front section of the pump body is larger than the diameter of the middle section of the pump body, so that a first limiting step surface is formed between the front section of the pump body and the middle section of the pump body, the locking nut 1 extends into the front section of the pump body, and its rear end wall abuts against the first limiting step surface. When the driving device loses power and the moving iron core moves forward and resets under the action of the compression spring, the front end of the moving iron core abuts against the rear end wall of the locking nut 1 on the inner side of the first limiting step surface; the diameter of the rear section of the pump body is larger than the diameter of the middle section of the pump body, so that a second limiting step surface is formed between the rear section of the pump body and the middle section of the pump body, the locking nut 2 extends into the rear section of the pump body, and its front end abuts against the second limiting step surface.

[0011] Furthermore, the aforementioned low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system, wherein: the sealing device includes: a transversely placed "T"-shaped push rod, a push rod through hole is respectively provided on the end wall where each liquid channel is located, the front section of the push rod passes through the corresponding push rod through hole and extends forward until the rear end wall of the push rod is blocked by the corresponding end wall, and a push rod compression spring is provided between the front section of the push rod extending out of the push rod through hole and the corresponding end wall, so that the rear end wall of the push rod can be fitted with the corresponding end wall under the action of the push rod compression spring, and there is a gap between the rear end wall of the push rod and the circumferential side wall of the corresponding chamber to facilitate the movement of the push rod; when there is a gap between the rear end wall of the push rod and the corresponding end wall, the corresponding liquid channel is opened, and liquefied natural gas can flow from front to back through the corresponding liquid channel, the gap between the rear end wall of the push rod and the corresponding end wall or the moving iron core, and the gap between the rear end wall of the push rod and the circumferential side wall of the corresponding chamber.

[0012] Furthermore, the aforementioned low-temperature electromagnetic booster pump is used in a natural gas cylinder supply system, wherein: a slot is provided on the front section of the push rod extending out of the push rod through hole, the spring limit plate is inserted into the slot, the push rod compression spring is a conical spring whose diameter gradually increases from front to back, and the conical spring is sleeved on the push rod between the spring limit plate and the corresponding end wall.

[0013] Furthermore, the aforementioned low-temperature electromagnetic booster pump is used in a natural gas cylinder supply system, wherein: each liquid channel includes: a plurality of fan-shaped liquid channels evenly spaced circumferentially arranged on the corresponding end wall; when the rear end wall of the push rod is attached to the corresponding end wall, each fan-shaped liquid channel on the corresponding end wall can be closed.

[0014] Furthermore, in the aforementioned low-temperature electromagnetic booster pump used in a natural gas cylinder supply system, the driving device is a coil.

[0015] The advantages of the present invention are as follows: First, when the drive device is energized, the movable iron core moves backward under the pull of the electromagnetic force, causing the liquid passage entering the first active chamber to be opened, and liquefied natural gas is sucked into the first active chamber, completing the liquid filling process of the booster pump. When the drive device is de-energized, the force of the compression spring connecting the rear end of the movable iron core and the rear end wall of the pump body causes the movable iron core to move forward, closing the liquid passage entering the first active chamber and opening the liquid passage entering the second active chamber. The liquefied natural gas in the first active chamber enters the second active chamber, pressurizing the liquefied natural gas in the second active chamber, thereby opening the liquid passage out of the second active chamber and discharging the pressurized liquefied natural gas, completing the liquid discharge process of the booster pump. The above-mentioned simple structure and lightweight low-temperature electromagnetic booster pump reciprocates back and forth within the working chamber of the pump body through the energization and de-energization of the drive device and the action of the compression spring, and can operate stably at low temperatures of -196°C, thereby ensuring that the liquefied natural gas in the natural gas cylinder in a low liquid level state still meets the pressure requirements for use in the gas engine after vaporization. The gas supply system of the natural gas cylinder equipped with the booster pump can be pressurized safely and stably. 2. A further advantage of the present invention is that the rear end of the moving iron core is open, and a liquid channel and a matching sealing device are provided on the front end wall of the moving iron core. The rear end wall of the moving iron core is connected to the rear end wall of the pump body by a compression spring. The moving iron core with this structure allows the second movable cavity to contain the inner cavity of the moving iron core, which can not only ensure the effective volume of the second movable cavity but also further reduce the weight of the low-temperature electromagnetic booster pump and the volume of the low-temperature battery booster pump. When the low-temperature electromagnetic booster pump is working, the power required by the driving device to drive the moving iron core backward does not need to be too high, and the on-board power supply of the natural gas vehicle itself can be used as the power to drive the moving iron core backward. 3. A further advantage of the present invention is that the pump body comprises: a pump body with open front and rear ends, a locking nut 1 with an open rear end extending into the front section of the pump body body and being threadedly sealed with the inner side wall of the front section of the pump body body, a locking nut 2 with an open rear end extending into the rear section of the pump body body and being threadedly sealed with the inner side wall of the rear section of the pump body body, the front end wall of the locking nut 1 is the front end wall of the pump body, and the front end wall of the locking nut 2 is the rear end wall of the pump body, when the driving device loses power and the moving iron core moves forward and resets, the front end wall of the moving iron core rests on the rear end wall of the locking nut 1, the pump body with the above structure is easy to manufacture and assemble, and is also convenient for the maintenance of the moving iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a low-temperature electromagnetic booster pump used in a natural gas cylinder supply system according to the present invention;

[0017] Figure 2 yes Figure 1 Schematic diagram of the left view structure;

[0018] Figure 31 is a schematic diagram of the three-dimensional structure of the locking nut;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the moving iron core;

[0020] Figure 5 1 is a schematic diagram of the three-dimensional structure of the locking nut 2;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the putter. Implementation Method

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0023] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6As shown, a low-temperature electromagnetic booster pump for a natural gas cylinder supply system comprises: The pump body is closed on all sides, and a working chamber 1 is provided in the pump body. A moving iron core 2 is provided in the working chamber 1, and the side walls of the moving iron core 2 can be movably sealed with the side walls of the working chamber 1, so that the working chamber 1 is divided into a first active chamber 11 located between the front end wall of the pump body and the moving iron core, and a second active chamber 12 located between the moving iron core and the rear end wall of the pump body. A compression spring 3 is provided in the second active chamber 12 between the rear end of the moving iron core 2 and the rear end wall of the pump body, and the compression spring 3 can push the moving iron core 2 to move forward. A driving device 4 is provided outside the pump body 1, which can drive the moving iron core 2 to move backward under the action of electromagnetic force. Liquid channels are respectively provided on the front end wall of the pump body, the moving iron core 2, and the rear end wall of the pump body. A sealing device that can open or close the corresponding liquid channel is respectively provided on the front end wall of the pump body, the moving iron core 2, and the rear end wall of the pump body; the structure of the pump body, the driving device 4, the moving iron core 2, the liquid channel, and the sealing device meets the following requirements: when the driving device is energized, the moving iron core 2 is in the driving device 4 Under the action of the electromagnetic force, the movable iron core 2 moves backward along the side wall of the working chamber 1, so that the liquid channel on the front end wall of the pump body is opened, and liquefied natural gas can enter the first active chamber 11 through the liquid channel on the front end wall of the pump body. During this process, the sealing devices on the movable iron core 2 and the rear end wall of the pump body always close the corresponding liquid channels. When the driving device loses power, the movable iron core 2 moves forward along the side wall of the working chamber 1 under the action of the compression spring 3, so that the liquid channel on the front end wall of the pump body is closed. Subsequently, the liquid channel on the movable iron core 2 is opened, and some liquefied natural gas in the first active chamber 11 enters the second active chamber 12 through the liquid channel on the movable iron core 2, so that the liquefied natural gas in the second active chamber 12 is pressurized. Then, the liquid channel on the rear end wall of the pump body is opened, and some liquefied natural gas in the second active chamber 12 is discharged through the liquid channel on the rear end wall of the pump body. When the movable iron core 2 moves forward and resets, each sealing device closes the corresponding liquid channel. In this embodiment, the movable iron core 2 is made of soft magnetic stainless steel.

[0024] In this embodiment, the rear end of the hollow moving iron core 2 is open, and a liquid channel and a corresponding sealing device are provided on the front end wall 21 of the moving iron core. The rear end wall of the moving iron core 2 is connected to the rear end wall of the pump body via a compression spring 3. The first movable chamber 11 is located between the front end wall of the pump body and the front end wall 21 of the moving iron core, and the second movable chamber 12 is located between the front end wall 21 of the moving iron core and the rear end wall of the pump body. The second movable chamber 12 contains the inner chamber 22 of the moving iron core. The moving iron core 2 of the above-described structure can ensure the effective volume of the second movable chamber 12 while reducing the weight and volume of the low-temperature electromagnetic booster pump. This reduces the power required by the drive device 4 to drive the moving iron core 2 backward during operation of the low-temperature electromagnetic booster pump, and the moving iron core 2 can be driven backward using the onboard power supply of the natural gas vehicle itself.

[0025] In this embodiment, the pump body includes: a tubular pump body 5 with open front and rear ends, a locking nut 1 6 with an open rear end extending into the front section 51 of the pump body, and the side wall of the locking nut 1 6 extending into the front section 51 of the pump body is fixedly sealed and connected to the inner side wall of the front section 51 of the pump body, and a locking nut 2 7 with an open rear end extending into the rear section 53 of the pump body, and the side wall of the locking nut 2 7 extending into the rear section 53 of the pump body is fixedly sealed and connected to the inner side wall of the rear section 53 of the pump body. During actual assembly, the locking nut 1 6 is threadedly sealed and connected to the front section 51 of the pump body, and the locking nut 2 is threadedly sealed and connected to the rear section 53 of the pump body. This structure is not only convenient for the manufacture of the pump body, but also convenient for the installation and maintenance of the moving iron core 2; a locking nut 1 is provided on the front end wall 61 A liquid channel is provided so that the front end wall 61 of the locking nut 1 is the front end wall of the pump body, and a liquid channel is provided on the front end wall 71 of the locking nut 2, so that the front end wall 71 of the locking nut 2 is the rear end wall of the pump body. The side wall of the moving iron core 2 and the inner side wall of the middle section 52 of the pump body between the rear end wall of the locking nut 1 and the front end wall of the locking nut 2 are movably sealed. When the driving device 4 loses power and the moving iron core 2 moves forward and resets under the action of the compression spring 3, the front end of the moving iron core 2 rests on the rear end wall of the locking nut 1 6; the inner cavity 62 of the locking nut 1 is connected to the inner cavity of the pump body 5 through the opening at its rear end, so that the inner cavity 62 of the locking nut 1 and the inner cavity of the middle section 52 of the pump body cooperate to form a working chamber 1, and the first movable chamber 11 contains the inner cavity 62 of the locking nut 1. The side wall of the moving iron core 2 and the inner side wall of the middle section 52 of the pump body are movably sealed in the following manner: two circumferential sealing grooves 23 are provided on the side wall of the moving iron core 2 at intervals in front and back, and a sealing ring 24 is provided in each circumferential sealing groove 23. The inner side wall of the middle section 52 of the pump body and the side wall of the moving iron core 2 are sealed by the two sealing rings 24.

[0026] In this embodiment, the diameter of the front section 51 of the pump body is larger than the diameter of the middle section 52 of the pump body, so that a first limiting step surface is formed between the front section 51 of the pump body and the middle section 52 of the pump body, and the locking nut 6 extends into the front section 51 of the pump body, and its rear end wall abuts against the first limiting step surface. When the driving device 4 loses power and the moving iron core 2 moves forward and resets under the action of the compression spring 3, the front end of the moving iron core 2 abuts against the rear end wall of the locking nut 6 on the inner side of the first limiting step surface; the diameter of the rear section 53 of the pump body is larger than the diameter of the middle section 52 of the pump body, so that a second limiting step surface is formed between the rear section 53 of the pump body and the middle section 52 of the pump body, and the locking nut 7 extends into the rear section 53 of the pump body, and its front end wall 71 abuts against the second limiting step surface. The provision of the first limiting step surface and the second limiting step surface not only facilitates the installation of the locking nut 1 6 and the locking nut 2 7, but also limits the position of the rear end wall of the locking nut 1 6 and the position of the compression spring 3, thereby ultimately limiting the forward and backward movement of the moving iron core 2.

[0027] In this embodiment, the sealing device includes: a "T"-shaped push rod 81 placed horizontally, a push rod through hole 82 is respectively provided on the front end wall 61 of the locking nut 1, the front end wall 21 of the moving iron core, and the front end wall 71 of the locking nut 2, and the front end section 811 of the push rod extends forward through the corresponding push rod through hole 82 until the rear end wall 812 of the push rod is blocked by the corresponding end wall. The front end section 811 of the push rod extending out of the push rod through hole and the corresponding end wall are connected by a push rod compression spring 813, so that the rear end wall 812 of the push rod is blocked by the push rod. Under the action of the compression spring 813, it can fit against the corresponding end wall and close the liquid channel on the corresponding end wall. A gap is formed between the push rod rear end wall 812 and the circumferential side wall of the corresponding chamber to facilitate the movement of the push rod 81. When the push rod 81 moves backward, creating a gap between the push rod rear end wall 812 and the corresponding end wall, the corresponding liquid channel is opened, and liquefied natural gas can flow from front to back through the corresponding liquid channel, the gap between the push rod rear end wall 812 and the corresponding end wall, and the gap between the push rod rear end wall 812 and the circumferential side wall of the corresponding chamber. The push rod front section 811 extending out of the push rod through hole 82 is provided with a slot 814, into which a spring stopper 815 is inserted. The push rod compression spring 813 is a conical spring that gradually increases in size from front to back and is mounted on the push rod between the spring stopper 815 and the corresponding end wall.

[0028] In this embodiment, each liquid channel comprises a plurality of fan-shaped liquid channels 9 evenly spaced circumferentially on the corresponding end wall. When the push rod rear end wall 812 is sealingly attached to the corresponding end wall, each fan-shaped liquid channel 9 on the corresponding end wall is sealed. In actual manufacturing, three fan-shaped liquid channels 9 are evenly spaced circumferentially on the front end wall 61 of the first locking nut, the front end wall 21 of the movable iron core, and the front end wall 71 of the second locking nut.

[0029] In this embodiment, the driving device 4 is a coil, and the coil is energized or de-energized so that the moving iron core 2 can move smoothly back and forth along the inner wall of the working chamber 1.

[0030] After the cryogenic electromagnetic booster pump is installed in the natural gas cylinder supply system, the front end of the cryogenic electromagnetic booster pump is sealed connected to the booster liquid inlet pipe, and the rear end of the cryogenic electromagnetic booster pump is sealed connected to the booster gas return pipe.After the driving device 4 is energized, the moving iron core 2 moves backward, the first active chamber 11 becomes larger and the second active chamber 12 becomes smaller, so that the pressure in the first active chamber 11 decreases and the pressure in the second active chamber 12 increases. When the pressure difference between the boost liquid inlet pipe and the first active chamber 11 can overcome the force of the push rod compression spring 813 on the push rod 81 on the front end wall 61 of the locking nut, the push rod 81 moves backward so that there is a gap between the rear end wall 812 of the push rod and the front end wall 61 of the locking nut. The liquefied natural gas in the boost liquid inlet pipe enters the first active chamber 11 through the three fan-shaped liquid channels 9 on the front end wall 61 of the locking nut. When the driving device 4 is energized, the low-temperature electromagnetic boost pump fills the liquid, and the increased pressure in the second active chamber 12 cannot The liquid channel on the front end wall 71 of the locking nut 2 is opened, so that the rear end walls 812 of the two push rods on the front end wall 21 of the moving iron core and the front end wall 71 of the locking nut 2 are always sealed and fitted on the corresponding end walls respectively; when the driving device 4 loses power, the moving iron core 2 moves forward, the first active chamber 11 becomes smaller and the second active chamber 12 becomes larger, so that the pressure in the first active chamber 11 increases and the pressure in the second active chamber 12 decreases. When the pressure difference between the boost inlet pipe and the first active chamber 11 causes the rear end wall 812 of the push rod on the front end wall 61 of the locking nut 1 to fit onto the front end wall 61 of the locking nut 1, the first active chamber 11 is closed, and the low-temperature electromagnetic booster pump stops feeding liquid. In the process of the moving iron core 2 moving forward, when the first active chamber 11 becomes smaller and the second active chamber 12 becomes larger, the pressure in the first active chamber 11 increases and the pressure in the second active chamber 12 decreases. The pressure difference between the first and second active chambers 11 and 12 causes the push rod 81 on the front end wall 21 of the moving iron core to move backward, and the first active chamber 11 and the second active chamber 12 are connected through the fan-shaped liquid channels 9 on the front end wall 21 of the moving iron core. Part of the liquefied natural gas in the first active chamber 11 enters the second active chamber 12, causing the pressure in the second active chamber 12 to increase. When the pressure difference between the second active chamber 12 and the inner cavity 72 of the locking nut 2 causes the push rod 81 on the front end wall 71 of the locking nut 2 to move backward, the second active chamber 12 and the inner cavity 72 of the locking nut 2 are connected through the fan-shaped liquid channels 9 on the front end wall 71 of the locking nut 2, and part of the liquefied natural gas in the second active chamber 12 enters the pressurized return pipe through the inner cavity of the locking nut 2 7, i.e., the low-temperature electromagnetic booster. The pump discharges liquid. During the liquid discharge process, the pressure in the second active chamber 12 gradually decreases until the pressure difference between the second active chamber 12 and the inner chamber 72 of the locking nut 2 and the action of the push rod compression spring 813 cause the push rod 81 on the front end wall 71 of the locking nut 2 to move forward until the rear end wall 812 of the push rod is sealed against the front end wall 71 of the locking nut 2. When the moving iron core 2 moves forward and resets, each push rod 81 respectively closes the liquid channel on the corresponding end wall; the low-temperature electromagnetic booster pump drives the moving iron core 2 to move back and forth through the power-on and power-off of the drive device 4 and the action of the compression spring 3, so that the liquefied natural gas in the pressurized liquid inlet pipe is sucked into the booster pump, and the liquefied natural gas in the booster pump is pressurized and enters the pressurized gas return pipe, thereby increasing the pressure in the natural gas cylinder.

[0031] The advantages of the present invention are as follows: 1. When the driving device 4 is powered on, the moving iron core 2 moves backward under the traction of the electromagnetic force, so that the liquid channel entering the first active chamber 11 is opened, and the liquefied natural gas is sucked into the first active chamber 11, completing the liquid filling process of the booster pump; when the driving device 4 is powered off, the force of the compression spring 3 connecting the rear end of the moving iron core 2 and the rear end wall of the pump body causes the moving iron core 2 to move forward, the liquid channel entering the first active chamber 11 is closed, and the liquid channel entering the second active chamber 12 is opened, and the liquefied natural gas in the first active chamber 11 enters the second active chamber 12, and the liquid in the second active chamber 12 is sucked into the first active chamber 11. The liquefied natural gas is pressurized, so that the liquid channel for discharging the second active chamber 12 is opened, and the pressurized liquefied natural gas is discharged, completing the liquid discharge process of the booster pump. The above-mentioned low-temperature electromagnetic booster pump with a simple structure and light weight pulls the iron core 2 to move back and forth in the working chamber 1 of the pump body through the power-on and power-off of the drive device 4 and the action of the compression spring 3. It can work stably at a low temperature of -196°C, thereby ensuring that the liquefied natural gas in the natural gas cylinder in a low liquid level state can still reach the pressure requirement for use in the gas engine after vaporization, so that the gas supply system of the natural gas cylinder equipped with the booster pump can be safely and stably pressurized. 2. Further advantages of the present invention are: the rear end of the moving iron core 2 is open, and a liquid channel and a matching sealing device are provided on the front end wall 21 of the moving iron core. The rear end wall of the moving iron core 2 is connected to the rear end wall of the pump body by a compression spring 3. The moving iron core 2 with this structure makes the second active cavity 12 contain the inner cavity 22 of the moving iron core, which can not only ensure the effective volume of the second active cavity 12 but also further reduce the weight of the low-temperature electromagnetic booster pump, while further reducing the volume of the low-temperature battery booster pump, so that when the low-temperature electromagnetic booster pump is working, the power of the driving device 4 to drive the moving iron core 2 to move backward does not need to be too high, and the on-board power supply provided by the natural gas vehicle itself can be used as power to drive the moving iron core 2 to move backward. 3. A further advantage of the present invention is that the pump body comprises: a pump body 52 with open front and rear ends, a locking nut 6 with an open rear end extending into the front section 51 of the pump body and being threadedly sealed with the inner side wall of the front section 51 of the pump body, a locking nut 2 7 with an open rear end extending into the rear section 53 of the pump body and being threadedly sealed with the inner side wall of the rear section 53 of the pump body, the front end wall of the locking nut 1 6 being the front end wall of the pump body, and the front end wall of the locking nut 2 7 being the rear end wall of the pump body, when the driving device 4 loses power and the moving iron core 2 moves forward and resets, the front end wall of the moving iron core 2 abuts against the rear end wall of the locking nut 1 6, the pump body with the above structure is easy to manufacture and assemble, and is also convenient for the maintenance of the moving iron core 2.

Claims

1. A cryogenic electromagnetic booster pump for use in a natural gas cylinder supply system, comprising: The pump body is closed on all sides, and a working chamber is provided inside the pump body, which is characterized in that: a moving iron core is provided in the working chamber, and the side walls of the moving iron core can be movably sealed with the side walls of the working chamber, so that the working chamber is divided into a first movable chamber located between the front end wall of the pump body and the moving iron core, and a second movable chamber located between the moving iron core and the rear end wall of the pump body. A compression spring is provided in the second movable chamber between the rear end of the moving iron core and the rear end wall of the pump body, and the compression spring can push the moving iron core forward. A driving device that can drive the moving iron core to move backward under the action of electromagnetic force is provided outside the pump body, and liquid channels are respectively provided on the front end wall of the pump body, the moving iron core, and the rear end wall of the pump body. A sealing device that can open or close the corresponding liquid channel is respectively provided on the front end wall of the pump body, the moving iron core, and the rear end wall of the pump body; the structure of the pump body, the driving device, the moving iron core, the liquid channel, and the sealing device meets the following requirements: when the driving device is energized, the moving iron core is in the driving device. Under the action of the electromagnetic force, it moves backward along the side wall of the working chamber, so that the liquid channel on the front end wall of the pump body is opened, and liquefied natural gas can enter the first active chamber through the liquid channel on the front end wall of the pump body. During this process, the sealing devices on the moving iron core and the rear end wall of the pump body always close the corresponding liquid channels respectively; during the power-off process of the driving device, the moving iron core moves forward along the side wall of the working chamber under the action of the compression spring, so that the liquid channel on the front end wall of the pump body is closed, the liquid channel on the moving iron core is opened, and part of the liquefied natural gas in the first active chamber enters the second active chamber through the liquid channel on the moving iron core, so that the liquefied natural gas in the second active chamber is pressurized, and then the liquid channel on the rear end wall of the pump body is opened, and part of the liquefied natural gas in the second active chamber is discharged through the liquid channel on the rear end wall of the pump body. When the moving iron core moves forward and resets, each sealing device closes the corresponding liquid channel respectively; The rear end of the hollow moving iron core is open. A liquid channel and a corresponding sealing device are provided on the front end wall of the moving iron core. The rear end wall of the moving iron core is connected to the rear end wall of the pump body via a compression spring. The first movable chamber is located between the front end wall of the pump body and the front end wall of the moving iron core. The second movable chamber is located between the front end wall of the moving iron core and the rear end wall of the pump body. The second movable chamber contains the inner cavity of the moving iron core. Two circumferential sealing grooves are arranged on the side wall of the moving iron core at intervals, and a sealing ring is arranged in each circumferential sealing groove. The side wall of the working chamber and the side wall of the moving iron core are sealed by the two sealing rings.

2. The low-temperature electromagnetic booster pump for a natural gas cylinder supply system according to claim 1, characterized in that: The pump body includes: The cam is secured to the cam face and is secured to the pump head by a secure seal between the cam face and the pump head. The inner cavity of the locking nut 1 and the inner cavity of the middle section of the pump body cooperate to form a working cavity, and the first movable cavity includes the inner cavity of the locking nut 1.

3. The low-temperature electromagnetic booster pump for a natural gas cylinder supply system according to claim 2, characterized in that: The locking nut 1 is connected to the front section of the pump body through thread sealing, and the locking nut 2 is connected to the rear section of the pump body through thread sealing.

4. The low-temperature electromagnetic booster pump for a natural gas cylinder supply system according to claim 2, characterized in that: The diameter of the front section of the pump body is larger than the diameter of the middle section of the pump body, so that a first limiting step surface is formed between the front section of the pump body and the middle section of the pump body, and the locking nut 1 extends into the front section of the pump body, and its rear end wall abuts against the first limiting step surface. When the driving device loses power and the moving iron core moves forward and resets under the action of the compression spring, the front end of the moving iron core abuts against the rear end wall of the locking nut 1 on the inner side of the first limiting step surface; the diameter of the rear section of the pump body is larger than the diameter of the middle section of the pump body, so that a second limiting step surface is formed between the rear section of the pump body and the middle section of the pump body, and the locking nut 2 extends into the rear section of the pump body, and its front end abuts against the second limiting step surface.

5. A cryogenic electromagnetic booster pump for use in a natural gas cylinder supply system according to claim 1, 2, 3 or 4, characterized in that: The sealing device includes: a horizontally placed "T"-shaped push rod, and a push rod through hole is respectively provided on the end wall where each liquid channel is located. The front section of the push rod extends forward through the corresponding push rod through hole until the rear end wall of the push rod is blocked by the corresponding end wall. A push rod compression spring is provided between the front section of the push rod extending out of the push rod through hole and the corresponding end wall, so that the rear end wall of the push rod can fit with the corresponding end wall under the action of the push rod compression spring, and there is a gap between the rear end wall of the push rod and the circumferential side wall of the corresponding chamber to facilitate the movement of the push rod; when there is a gap between the rear end wall of the push rod and the corresponding end wall, the corresponding liquid channel is opened, and liquefied natural gas can flow from front to back through the corresponding liquid channel, the gap between the rear end wall of the push rod and the corresponding end wall or the moving iron core, and the gap between the rear end wall of the push rod and the circumferential side wall of the corresponding chamber.

6. The low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system according to claim 5, characterized in that: A slot is provided on the front section of the push rod extending out of the push rod through hole, and the spring limit piece is inserted into the slot. The push rod compression spring is a conical spring with a diameter gradually increasing from front to back. The conical spring is sleeved on the push rod between the spring limit piece and the corresponding end wall.

7. The low-temperature electromagnetic booster pump for use in a natural gas cylinder supply system according to claim 5, characterized in that: Each liquid channel includes: a plurality of fan-shaped liquid channels evenly spaced circumferentially arranged on the corresponding end wall; when the rear end wall of the push rod is attached to the corresponding end wall, each fan-shaped liquid channel on the corresponding end wall can be closed.

8. A cryogenic electromagnetic booster pump for use in a natural gas cylinder supply system according to claim 1, 2, 3, or 4, characterized in that: The driving device is a coil.

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