Gas cylinder with pump

Abstract

The invention discloses a gas cylinder with a pump, comprising: an inner tube and an outer tube, the outer tube and the inner tube are mutually supported by a pump sleeve assembly and a rear support structure, the pump sleeve assembly comprises: a neck tube fixed in a through hole on an outer front head, the outer end of a support tube 1 extends into the neck tube and is fixed on a docking flange 1 at the outer end of the neck tube, the inner end of the support tube 1 extends into the inner tube through the pump sleeve through hole on the inner front head, a support tube 2 is arranged around the inner end of the support tube 1, the support tube 1 and the inner end of the support tube 2 are fixedly connected by a docking flange 2, the outer end of the support tube 2 is fixed in the pump sleeve through hole on the inner front head, the pump sleeve through hole is located below the through hole on the outer front head, so that the pump sleeve assembly is tilted, and the tube wall of the neck tube is provided with mutually independent liquid inlet channels, liquid outlet channels, and gas phase channels; the inner end of the infusion pump passes through the pump sleeve assembly and enters the inner tube, and the outer end of the infusion pump housing is sealed and connected to the docking flange 1. The gas cylinder has high thermal insulation performance and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the field of cryogenic containers for storing cryogenic liquids such as liquefied natural gas and liquid hydrogen, in particular to gas cylinders with pumps. Background Art

[0002] With the successful development of domestic high-power in-cylinder high-pressure direct injection compression ignition natural gas engines (HPDI engines for short), the development of gas cylinders with pumps that match HPDI engines has also been put on the agenda. The existing gas cylinder with pump includes: an outer cylinder, which includes an outer front head, an outer cylinder body, and an outer rear head connected to each other, and an inner cylinder, which includes an inner front head, an inner cylinder body, and an inner rear head connected to each other. There is a vacuum interlayer between the inner cylinder and the outer cylinder. The inner and outer cylinders are supported by a front support structure supported between the outer front head and the inner front head and a rear support structure supported between the outer rear head and the inner rear head. An internal piping unit and a liquid level sensor are also provided. The internal piping unit includes: an inner liquid inlet pipe, an inner vent pipe and an inner liquid outlet pipe. A distribution head is fixedly provided in the central through hole of the outer front head. The inner end of the distribution head is fixed to the outer end of the front support structure. A plurality of independent connecting channels are provided in the distribution head. Through these connecting channels, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner vent pipe in the gas cylinder can be connected one by one with the corresponding pipes outside the gas cylinder. The high-pressure pump sleeve for installing the high-pressure infusion pump passes through another through hole on the outer front head, passes through the vacuum interlayer inward, and then extends into the inner cylinder through the through hole on the inner front head. The through hole on the inner front head is located below another through hole on the outer front head, so that the high-pressure pump sleeve is tilted, so that the inner end of the high-pressure infusion pump tilts downward to enter the high-pressure pump sleeve and then enters the inner cavity of the inner cylinder. A reserved cover is fixedly arranged on the inner wall of the inner rear head, and a reserved space is formed between the reserved cover and the inner rear head to balance the gas-liquid pressure in the inner cylinder. When the gas cylinder is working normally, most of the space in the reserved space is gas phase space. The gas cylinder with a pump of the above structure has the following disadvantages: the front support structure, distribution head, rear support structure, high-pressure pump and high-pressure pump sleeve of the gas cylinder with a pump are all the main heat conduction paths of the gas cylinder with a pump. Due to the large number of heat conduction paths, the thermal insulation performance of the gas cylinder with a pump is poor. Moreover, due to the provision of multiple structures such as the front support structure, distribution head and high-pressure pump sleeve, the manufacturing cost of the gas cylinder with a pump is relatively high. In addition, the reserved space provided at the inner rear head usually only has the function of balancing the gas-liquid pressure in the inner cylinder, and does not play a greater role in the thermal insulation performance of the gas cylinder. Summary of the invention

[0003] The object of the present invention is to provide a gas cylinder with a pump which has high thermal insulation performance and low manufacturing cost.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a gas cylinder with a pump, comprising: an outer cylinder, which comprises an outer front head, an outer cylinder body, and an outer rear head connected to each other; an inner cylinder, which comprises an inner front head, an inner cylinder body, and an inner rear head connected to each other; a vacuum interlayer is provided between the inner cylinder and the outer cylinder; the rear ends of the outer cylinder and the inner cylinder are mutually supported by a rear support structure arranged between the outer rear head and the inner rear head; an inner liquid inlet pipe, an inner liquid outlet pipe, an inner vent pipe and a liquid level sensor are also provided, and the outer front head and the inner front head are mutually supported by a pump sleeve assembly, and the pump sleeve assembly comprises: a neck tube fixed in the through hole on the outer front head, a docking flange 1 is fixed on the outer end of the neck tube, the inner end of the neck tube extends into the vacuum interlayer and has a thermal insulation gap with the inner front head, the outer end of the support tube 1 extends into the neck tube and is fixed on the docking flange 1 at the outer end of the neck tube, there is a thermal insulation gap between the support tube 1 and the neck tube, and the inner end of the support tube 1 passes through the vacuum interlayer inwardly and then passes through the inner front head The pump sleeve through hole on the support tube extends into the inner tube, the tube body part of the support tube one extending into the inner tube extends into the support tube two, there is a heat insulation gap between the support tube one and the support tube two, the inner end of the support tube one is fixedly connected with the inner end of the support tube two by the docking flange two, the outer end of the support tube two is fixed in the pump sleeve through hole on the inner front head, the pump sleeve through hole on the inner front head is located below the through hole on the outer front head, so that the pump sleeve assembly is arranged obliquely, and the tube wall of the neck tube is spaced apart by mutually independent liquid inlet Channel, liquid outlet channel, gas phase channel; the outer end interfaces of the liquid inlet channel, liquid outlet channel, and gas phase channel can be connected with the external liquid inlet pipe, external liquid outlet pipe, and external vent pipe outside the gas cylinder with pump respectively, and the inner end interfaces of the liquid inlet channel, liquid outlet channel, and gas phase channel are connected with the inner liquid inlet pipe, inner liquid outlet pipe, and inner vent pipe inside the gas cylinder with pump respectively; the inner end of the infusion pump passes through the docking flange 1, the support tube 1, and the docking flange 2 in sequence and then enters the inner tube, and the outer end of the infusion pump housing is sealed and connected with the docking flange 1.

[0005] Furthermore, the aforementioned gas cylinder with a pump, wherein: a reserved cover shell is provided on the inner wall of the inner front head, and the inner front head and the reserved cover shell cooperate to form a reserved space, the reserved space is connected with the liquid storage space of the inner tube through the through hole at the bottom of the reserved cover shell, the second support tube passes through the reserved cover shell and the gas phase space in the reserved space, the outer wall of the second support tube is seal-welded to the through hole on the reserved cover shell, and the second docking flange extends out of the reserved cover shell and extends into the liquid storage space of the inner tube.

[0006] Furthermore, in the aforementioned gas cylinder with a pump, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner vent pipe all pass through the reserved cover and the gas phase space in the reserved space respectively, and the outer walls of the inner liquid inlet pipe, the inner liquid outlet pipe and the inner vent pipe are respectively sealed with the perforations on the reserved cover.

[0007] Furthermore, in the aforementioned gas cylinder with a pump, a heat insulating cover is provided on the inner wall of the inner rear head to cover the rear support structure, a heat insulating space is formed inside the heat insulating cover, the heat insulating space is connected to the vacuum interlayer, and a thermal insulation layer is provided on the inner side wall of the heat insulating cover.

[0008] Furthermore, in the aforementioned gas cylinder with pump, the outer end of the second support tube is supported on the first support tube through a heat insulating retaining ring.

[0009] Furthermore, in the aforementioned gas cylinder with pump, the heat-insulating gap between the support tube 1 and the support tube 2 is filled with heat-insulating material.

[0010] Furthermore, in the aforementioned gas cylinder with pump, the liquid inlet of the infusion pump is located at the bottom of the inner cavity of the inner cylinder.

[0011] Furthermore, in the aforementioned gas cylinder with pump, the neck tube is fixed in the central through hole of the outer front head.

[0012] Furthermore, the aforementioned gas cylinder with a pump, wherein: a balancing through hole is provided on the bottom wall of the docking flange 2 extending out of the reserved space, the inlet end of the pump sleeve pressure balancing tube is fixed in the through hole, the pump sleeve pressure balancing tube is communicated with the inner cavity of the support tube 1 through the through hole, and the outlet end of the pump sleeve pressure balancing tube is located at the top of the inner cavity of the inner tube; the balancing through hole is a step hole, and the aperture of the upper section of the balancing through hole is smaller than the aperture of the lower section.

[0013] Furthermore, in the aforementioned gas cylinder with a pump, internal threads are arranged on the inner walls of the outer end interfaces of the liquid inlet channel, the liquid outlet channel and the gas phase channel.

[0014] The beneficial effects of the present invention are as follows: the neck tube in the pump sleeve assembly is fixed in the through hole of the outer front head, and the outer end of the support tube 2 is fixed in the pump sleeve through hole of the inner front head; a liquid inlet channel that can connect the inner liquid inlet pipe and the outer liquid inlet pipe, a liquid outlet channel that can connect the inner liquid outlet pipe and the outer liquid outlet pipe, and a gas phase channel that can connect the inner vent pipe and the outer vent pipe are provided in the tube wall of the neck tube in the pump sleeve assembly; the above structure enables the pump sleeve assembly to have the function of supporting the inner and outer cylinders, and also has the function of centralized pipeline extraction and distribution of the distribution head, so that the gas cylinder with pump does not need to be additionally provided with a front support structure and a distribution head, thereby reducing the heat conduction path of the gas cylinder with pump, improving the thermal insulation performance of the gas cylinder with pump, and in addition, it simplifies the structure of the gas cylinder with pump, thereby reducing the manufacturing cost of the gas cylinder with pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the gas cylinder with pump according to the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of a local enlarged structure;

[0017] Figure 3It is a schematic diagram of the structure of the pump sleeve assembly;

[0018] Figure 4 Schematic diagram of the three-dimensional structure of the neck tube;

[0019] Figure 5 for Figure 2 Schematic diagram of the structure in the Z direction. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the gas cylinder with a pump comprises: an outer cylinder 1, which comprises an outer front head 12, an outer cylinder body 11, and an outer rear head 13 connected to each other; an inner cylinder 7, which comprises an inner front head 72, an inner cylinder body 71, and an inner rear head 73 connected to each other; the inner cylinder 7 and the outer cylinder 1 are coaxially arranged and a vacuum interlayer is formed between the inner and outer cylinders; the rear ends of the outer cylinder 1 and the inner cylinder 7 are mutually supported by a rear support structure 9 arranged between the outer rear head 13 and the inner rear head 73; an inner liquid inlet pipe 31, an inner liquid outlet pipe 32, an inner vent pipe 33 and a liquid level sensor 34 are also provided. The outer front head 12 and the inner front head 72 are supported by each other through the pump sleeve assembly 2, and the pump sleeve assembly 2 includes: a neck tube 22 fixed in the through hole on the outer front head 12. In the present embodiment, the outer wall of the neck tube 22 is sealed and welded to the through hole, a docking flange 21 is fixed to the outer end of the neck tube 22, the inner end of the neck tube 22 extends into the vacuum interlayer and has a thermal insulation gap with the inner front head 72, the outer end of the support tube 23 extends into the neck tube 22 and is fixed on the docking flange 21 at the outer end of the neck tube, the support tube 23 has a thermal insulation gap with the neck tube 22, the inner end of the support tube 23 passes through the vacuum interlayer inwardly and then extends into the inner through the pump sleeve through hole on the inner front head 72 In the cylinder 7, the tube body part of the support tube 1 23 extending into the inner cylinder 7 extends into the support tube 2 24, and there is a heat insulation gap between the support tube 1 23 and the support tube 2 24. The inner end of the support tube 1 23 is fixedly connected with the inner end of the support tube 2 24 through the docking flange 25, and the outer end of the support tube 2 24 is fixed in the pump sleeve through hole on the inner front head 72. In this embodiment, the outer wall of the support tube 2 24 is sealed and welded with the pump sleeve through hole, and the pump sleeve through hole on the inner front head 72 is located below the through hole on the outer front head 12, so that the pump sleeve assembly 2 is tilted, and the bottom tube wall of the neck tube 22 is spaced apart with mutually independent liquid inlet channels 221, liquid outlet channels 222, and gas phase channels 223. In this embodiment, the docking flange 1 21, the neck tube 22, the support tube 1 23, the support tube 2 24, and the docking flange 25 are all tilted. The outer end interfaces of the liquid inlet channel 221, the liquid outlet channel 222 and the gas phase channel 223 can be connected to the external liquid inlet pipe, the external liquid outlet pipe and the external vent pipe outside the gas cylinder with a pump respectively, and the inner end interfaces of the liquid inlet channel 221, the liquid outlet channel 222 and the gas phase channel 223 are connected to the internal liquid inlet pipe 31, the internal liquid outlet pipe 32 and the internal vent pipe 33 inside the gas cylinder with a pump respectively; the inner end inlet of the infusion pump 4 passes through the docking flange 21, the support tube 23 and the docking flange 25 in sequence and then enters the inner tube 7, and the outer end of the shell of the infusion pump 4 is sealed with the docking flange 21.

[0022] In this embodiment, the inner and outer cylinders are supported by each other through the pump sleeve assembly 2 supported between the outer front head 12 and the inner front head 72 and the rear support structure 9 supported between the outer rear head 13 and the inner rear head 73. The pump sleeve assembly 2 has the supporting function of the front support structure in the existing common gas cylinder with a pump. At the same time, since the tube wall of the neck tube 22 in the pump sleeve assembly 2 is provided with a liquid inlet channel 221 connecting the inner liquid inlet pipe 31 and the outer liquid inlet pipe, a liquid outlet channel 222 connecting the inner liquid outlet pipe 32 and the outer liquid pipe, and a gas phase channel 223 connecting the inner vent pipe 33 and the outer vent pipe, the pump sleeve assembly 2 has the pipeline centralized lead-out distribution function of the distribution head in the existing common gas cylinder with a pump. Since the pump sleeve assembly 2 in this embodiment not only has the function of installing the infusion pump 4 itself, but also has the functions of a front support structure and a distribution head, there is no need to configure a front support structure and a distribution head separately, thereby reducing the heat conduction path of the gas cylinder with a pump, improving the thermal insulation performance of the gas cylinder with a pump, and also simplifying the structure of the gas cylinder with a pump, thereby reducing the manufacturing cost of the gas cylinder with a pump.

[0023] In this embodiment, a reserved cover shell 5 is provided on the inner wall of the inner front cover 72, and the inner front cover 72 cooperates with the reserved cover shell 5 to form a reserved space 51, and the reserved space 51 is connected to the liquid storage space 74 of the inner tube 7 through the through hole at the bottom of the reserved cover shell 5. The second support tube 24 passes through the gas phase space in the reserved space 51 and the reserved cover shell 5, and the outer wall of the second support tube 24 is sealed and welded with the through hole on the reserved cover shell 5, and the second docking flange 25 extends out of the reserved cover shell 5 and extends into the liquid storage space 74 of the inner tube. The inner liquid inlet pipe 31, the inner liquid outlet pipe 32, and the inner vent pipe 33 all pass through the gas phase space in the reserved space 51 and the reserved cover shell 5, and the outer walls of the inner liquid inlet pipe 31, the inner liquid outlet pipe 32, and the inner vent pipe 33 are sealed with the through holes on the reserved cover shell 51. The purpose of placing the reserved space 51 in front is that the support tube 24, the inner liquid inlet pipe 31, the inner liquid outlet pipe 32, and the inner vent pipe 33 in the reserved space 51 are all arranged in the gas phase space in the reserved space 51, which can reduce the thermal conductivity of the external heat transferred to the low-temperature liquid through the pump sleeve assembly 2, the inner liquid inlet pipe 31, the inner liquid outlet pipe 32, and the inner vent pipe 33, thereby improving the insulation performance of the gas cylinder with pump. At the same time, since the outer wall of the support tube 24 is sealed and welded to the through hole on the reserved cover shell 5, the reserved cover shell 5 can also play a role in supporting the pump sleeve assembly 2.

[0024] In this embodiment, a heat insulation cover 8 covering the rear support structure 9 is provided on the inner wall of the inner rear end cap 73, a heat insulation space is formed inside the heat insulation cover 8, the heat insulation space is connected with the vacuum interlayer, and a heat insulation layer 81 is provided on the inner wall of the heat insulation cover 8. The heat insulation cover 8 is provided to isolate the cryogenic liquid in the liquid storage space 74 from the rear support structure 9, thereby reducing the thermal conductivity of the external heat transferred to the cryogenic liquid via the rear support structure 9. In addition, after the heat insulation space is connected with the vacuum interlayer, the heat insulation space is also a vacuum space, which further reduces the thermal conductivity of the external heat transferred to the cryogenic liquid via the rear support structure 9, thereby improving the thermal insulation performance of the gas cylinder with a pump.

[0025] In this embodiment, the outer end of the support tube 24 is supported on the support tube 1 23 by the heat-insulating retaining ring 26. In actual use, the heat-insulating retaining ring 26 can be made of glass fiber reinforced plastics or sintered steel. The purpose of setting the heat-insulating retaining ring 26 is: the heat-insulating retaining ring 26 made of glass fiber reinforced plastics is an excellent thermal insulation material, which blocks the partial path of external heat being transferred into the cryogenic liquid through the pump sleeve assembly 2, thereby reducing the heat leakage rate of the pump sleeve assembly 2; at the same time, the heat-insulating retaining ring 26 made of glass fiber reinforced plastics is light and high-strength, and is also a tough material with elastic-plastic properties, which can alleviate the structural deformation of the pump sleeve assembly 2 caused by harsh working conditions, so that the pump sleeve assembly 2 can stably support the inner tube 7 and the outer tube 1 of the pump cylinder. In order to further reduce the heat leakage rate of the pump sleeve assembly 2, the heat-insulating gap between the support tube 1 23 and the support tube 2 24 is filled with thermal insulation material.

[0026] In this embodiment, in order to facilitate the installation of the pump sleeve assembly 2 and reduce the difficulty of opening a through hole on the outer front head 12 and a pump sleeve through hole on the inner front head 22, the neck tube 22 is fixed in the central through hole of the outer front head 12.

[0027] like Figure 2 , Figure 3 , Figure 5As shown, a balancing through hole 251 is provided on the bottom wall of the docking flange 25 extending out of the reserved space 51, and the inlet end of the pump sleeve pressure balancing tube 6 is fixed in the balancing through hole 251. The pump sleeve pressure balancing tube is communicated with the inner cavity of the support tube 1 23 through the through hole 251, and the outlet end of the pump sleeve pressure balancing tube 6 is located at the top of the inner cavity of the inner tube. The purpose of setting the pump sleeve pressure balance tube 6 and the balance through hole 251 is that the inner end shell of the infusion pump 4 is tightly connected with the inner wall of the docking flange 25, and the low-temperature liquid in the liquid storage space 74 can leak into the inner cavity of the support tube 1 23. The low-temperature liquid entering the inner cavity of the support tube 1 23 will volatilize due to heat, so that the pressure in the inner cavity of the support tube 1 23 increases rapidly, thereby forming a safety hazard. After the balance through hole 251 and the pump sleeve pressure balance tube 6 are set, when the pressure in the inner cavity of the support tube 1 23 is greater than the pressure in the liquid storage space 74, the gas and liquid in the inner cavity of the support tube 1 23 can be quickly discharged into the liquid storage space 74 through the balance through hole 251 and the pump sleeve pressure balance tube 6, thereby ensuring the safety of the pump sleeve assembly 2. In this embodiment, in order to facilitate the assembly of the pump sleeve pressure balance tube 6, the balance through hole 251 is a stepped hole, and the aperture of the upper section of the balance through hole 251 is smaller than the aperture of the lower section.

[0028] In this embodiment, internal threads are provided on the inner walls of the outer end interfaces of the liquid inlet channel 221, the liquid outlet channel 222 and the gas phase channel 223, so as to facilitate the sealing of the liquid inlet channel 221, the liquid outlet channel 222 and the gas phase channel 223 when the pressure test of the gas cylinder with pump is carried out before use.

[0029] The advantages of the present invention are as follows: the neck tube 22 in the pump sleeve assembly 2 is fixed in the through hole of the outer front head 12, and the outer end of the support tube 24 is fixed in the pump sleeve through hole of the inner front head 72; the tube wall of the neck tube 22 in the pump sleeve assembly 2 is provided with a liquid inlet channel 221 which can connect the inner liquid inlet pipe 31 and the outer liquid inlet pipe, a liquid outlet channel which can connect the inner liquid outlet pipe 32 and the outer liquid pipe, and a gas phase channel 223 which can connect the inner vent pipe 33 and the outer vent pipe; the above structure enables the pump sleeve assembly 2 to have the function of supporting the inner and outer cylinders, and also has the function of centralized pipeline extraction and distribution of the distribution head, so that the gas cylinder with pump does not need to be additionally provided with a front support structure and a distribution head, thereby reducing the heat conduction path of the gas cylinder with pump, improving the thermal insulation performance of the gas cylinder with pump, and in addition, simplifying the structure of the gas cylinder with pump, thereby reducing the manufacturing cost of the gas cylinder with pump.

Claims

1. Gas cylinder with pump, including: The outer cylinder comprises an outer front head, an outer cylinder body and an outer rear head which are connected to each other; the inner cylinder comprises an inner front head, an inner cylinder body and an inner rear head which are connected to each other; a vacuum interlayer is formed between the inner cylinder and the outer cylinder; the rear ends of the outer cylinder and the inner cylinder are mutually supported by a rear support structure arranged between the outer rear head and the inner rear head; an inner liquid inlet pipe, an inner liquid outlet pipe, an inner vent pipe and a liquid level sensor are also arranged, characterized in that the outer front head and the inner front head are mutually supported by a pump sleeve assembly, and the pump sleeve assembly comprises: a neck tube fixed in the through hole on the outer front head, a docking flange 1 is fixed on the outer end of the neck tube, the inner end of the neck tube extends into the vacuum interlayer and has a thermal insulation gap with the inner front head, the outer end of the support tube 1 extends into the neck tube and is fixed on the docking flange 1 at the outer end of the neck tube, there is a thermal insulation gap between the support tube 1 and the neck tube, the inner end of the support tube 1 passes through the vacuum interlayer inwardly and then extends into the inner cylinder through the pump sleeve through hole on the inner front head , the tube body part extending into the inner cylinder on the support tube one extends into the support tube two, and there is a heat insulation gap between the support tube one and the support tube two, the inner end of the support tube one is fixedly connected to the inner end of the support tube two by the docking flange two, the outer end of the support tube two is fixed in the pump sleeve through hole on the inner front head, the pump sleeve through hole on the inner front head is located below the through hole on the outer front head, so that the pump sleeve assembly is tilted, and the tube wall of the neck tube is spaced apart with independent liquid inlet channels, liquid outlet channels, and gas phase channels; the outer end interfaces of the liquid inlet channel, the liquid outlet channel, and the gas phase channel can be respectively connected to the external liquid inlet pipe, the external liquid outlet pipe, and the external vent pipe outside the gas cylinder with a pump, and the inner end interfaces of the liquid inlet channel, the liquid outlet channel, and the gas phase channel are respectively connected to the internal liquid inlet pipe, the internal liquid outlet pipe, and the internal vent pipe in the gas cylinder with a pump; the inner end of the infusion pump passes through the docking flange one, the support tube one, and the docking flange two in turn and enters the inner cylinder, and the outer end of the infusion pump housing is sealed and connected to the docking flange one; A reserved cover shell is arranged on the inner wall of the inner front cover shell, and a reserved space is formed between the inner front cover shell and the reserved cover shell, the reserved space is connected with the liquid storage space of the inner cylinder through the through hole at the bottom of the reserved cover shell, the second support tube passes through the reserved cover shell and the gas phase space in the reserved space, the outer wall of the second support tube is sealed and welded with the through hole on the reserved cover shell, and the second docking flange extends out of the reserved cover shell and extends into the liquid storage space of the inner cylinder; A balancing through hole is provided on the bottom wall of the docking flange 2 extending out of the reserved space, and the inlet end of the pump sleeve pressure balancing pipe is fixed in the through hole. The pump sleeve pressure balancing pipe is communicated with the inner cavity of the support tube 1 through the through hole, and the outlet end of the pump sleeve pressure balancing pipe is located at the top of the inner cavity of the inner tube; the balancing through hole is a stepped hole, and the aperture of the upper section of the balancing through hole is smaller than the aperture of the lower section.

2. The gas cylinder with pump according to claim 1, characterized in that: The inner liquid inlet pipe, the inner liquid outlet pipe and the inner vent pipe respectively pass through the reserved cover shell and the gas phase space in the reserved space, and the outer walls of the inner liquid inlet pipe, the inner liquid outlet pipe and the inner vent pipe are respectively sealed with the through holes on the reserved cover shell.

3. The gas cylinder with pump according to claim 1 or 2, characterized in that: A heat insulation cover is arranged on the inner wall of the inner rear head to cover the rear support structure, a heat insulation space is formed inside the heat insulation cover, the heat insulation space is connected with the vacuum interlayer, and a heat preservation and heat insulation layer is arranged on the inner wall of the heat insulation cover.

4. The gas cylinder with pump according to claim 1 or 2, characterized in that: The outer end of the supporting tube 2 is supported on the supporting tube 1 through a heat insulating retaining ring.

5. The gas cylinder with pump according to claim 4, characterized in that: The heat insulating gap between the first support tube and the second support tube is filled with heat insulating material.

6. The gas cylinder with pump according to claim 1 or 2, characterized in that: The liquid inlet of the infusion pump is located at the bottom of the inner cavity of the inner tube.

7. The gas cylinder with pump according to claim 1 or 2, characterized in that: The neck tube is fixed in the central through hole of the outer front head.

8. The gas cylinder with pump according to claim 1 or 2, characterized in that: Internal threads are arranged on the inner walls of the outer end interfaces of the liquid inlet channel, the liquid outlet channel and the gas phase channel.

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