Sealing structure for hydrogen pump

Abstract

The utility model discloses a sealing structure for a hydrogen pump, which solves the technical problems that the service life of the hydrogen pump is not ideal under some special working conditions and leakage is easy to generate between hydrogen and a medium in a static state in the prior art. The sealing ring is installed between a hydrogen pump shell and a hydrogen pump shaft and comprises a sealing ring body installed on the hydrogen pump shell and a PTFE sealing piece which is arranged on the sealing ring body, integrally attached to the hydrogen pump shaft and used for starting and sealing the hydrogen pump shaft. An included angle ranging from 20 degrees to 40 degrees is formed between the PTFE sealing piece in the stretching state and the axis of the hydrogen pump shaft. The sealing structure for the hydrogen pump is simple in structure, scientific and reasonable in design and convenient to use, dynamic seal abrasion in the sealing structure for the hydrogen pump can be effectively reduced, the overall service life of the sealing structure is prolonged, and leakage between hydrogen and media can be effectively prevented in the static state.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen pump technical field, concretely relates to a sealing structure for hydrogen pump. BACKGROUND

[0002] A hydrogen pump is a device used for extracting, compressing, and delivering hydrogen gas, which is widely used in fuel cell systems, hydrogen energy storage systems, and other fields. In a fuel cell system, the hydrogen pump is responsible for delivering hydrogen gas to the fuel cell to help generate electricity. In a hydrogen energy storage system, the hydrogen pump is used to deliver hydrogen gas to the storage device to ensure the effective storage and use of hydrogen gas. The hydrogen pump is an important component of hydrogen energy technology and is crucial for the safe and efficient delivery and application of hydrogen gas. With the continuous development of hydrogen energy technology, the performance and efficiency of the hydrogen pump are constantly improving, providing important support for future clean energy applications.

[0003] The hydrogen pump has the characteristics of high efficiency, environmental protection, and safety.

[0004] 1. High efficiency: The hydrogen pump has the characteristics of high efficiency, which can compress hydrogen gas and store it in a container for convenient carrying and use. The hydrogen pump can also convert hydrogen gas into electrical energy to provide power for electric vehicles and other devices.

[0005] 2. Environmental protection: Compared with traditional fuels, hydrogen combustion does not produce any harmful substances, so the hydrogen pump is hailed as one of the most environmentally friendly energy devices, which can effectively alleviate climate change and environmental pollution problems.

[0006] 3. Safety: The hydrogen pump uses a high-pressure pump to compress and store hydrogen gas, and strict safety controls are required during transmission and use. However, under reasonable use, the hydrogen pump has good safety.

[0007] Currently, the service life of the hydrogen pump under some special working conditions is not ideal, and hydrogen gas and medium can still leak in a static state. Common special working conditions include: pressure 0.3MPa, maximum shaft speed 8000RPM, temperature -40℃~+120℃. INVENTION CONTENTS

[0008] The technical problem to be solved by the utility model is to provide a sealing structure for a hydrogen pump to at least solve some of the above technical problems.

[0009] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0010] A sealing structure for hydrogen pump is installed between a hydrogen pump shell and a hydrogen pump shaft, comprising a sealing ring main body installed on the hydrogen pump shell, and a PTFE sealing sheet provided on the sealing ring main body and integrally matched with the hydrogen pump shaft and used for starting sealing of the hydrogen pump shaft, and an included angle of 20°-40° is formed between the PTFE sealing sheet in a relaxed state and an axial center line of the hydrogen pump shaft.

[0011] Further, the PTFE sealing sheet comprises a PTFE sealing sheet A section and a PTFE sealing sheet B section, and the PTFE sealing sheet B section is distributed with spiral oil return grooves on a surface matched with the hydrogen pump shaft.

[0012] Further, the spiral oil return grooves have a depth of 0.07mm-0.13mm.

[0013] Further, the included angle between the PTFE sealing sheet in the relaxed state and the axial center line of the hydrogen pump shaft is 32°.

[0014] Further, the sealing structure further comprises a PTFE sealing ring press-fitted in the sealing ring main body, the PTFE sealing sheet and the PTFE sealing ring are of an integrated structure, and the PTFE sealing sheet extends from the PTFE sealing ring.

[0015] Further, the PTFE sealing sheet has a thickness of 0.25mm-0.35mm.

[0016] Further, the sealing ring main body comprises a rubber sealing ring and a sealing skeleton provided in the rubber sealing ring.

[0017] Further, the rubber sealing ring and the sealing skeleton are integrally vulcanized and formed into the sealing ring main body.

[0018] Compared with the prior art, the sealing structure for hydrogen pump has the following beneficial effects:

[0019] The sealing structure for hydrogen pump has the advantages of simple structure, scientific and reasonable design, convenient use, effective reduction of dynamic sealing wear, prolongation of the overall service life of the sealing structure, and effective prevention of leakage between hydrogen and medium in a static state. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The drawing is a structural schematic view of the sealing structure for hydrogen pump.

[0021] Figure 2 The drawing is a partial schematic view of the sealing structure for hydrogen pump assembled between the hydrogen pump shell and the hydrogen pump shaft.

[0022] Among them, the name corresponding to the reference sign is:

[0023] 1-seal ring body, 2-PTFE sealing sheet, 3-hydrogen pump shell, 4-hydrogen pump shaft, 5-PTFE seal ring, 6-PTFE sealing sheet A section, 7-PTFE sealing sheet B section, 8-spiral oil return groove, 11-rubber seal ring, 12-seal skeleton. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further detailed in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0025] Embodiment 1.

[0026] As Figures 1-2 Indicated, the utility model provides a kind of sealing structure for hydrogen pump, it is installed between hydrogen pump shell 3 and hydrogen pump shaft 4, including the seal ring body 1 installed on hydrogen pump shell 3, and the PTFE sealing sheet 2 for the dynamic sealing effect of hydrogen pump shaft 4 is set on seal ring body 1 and overall with hydrogen pump shaft 4 is adhered, and PTFE sealing sheet 2 forms the included angle of 20 °-40 ° between hydrogen pump shaft 4 axial line in relaxed state.

[0027] The utility model is simple in structure, scientific and reasonable in design, convenient to use, can effectively reduce the wear and tear of dynamic seal in sealing structure for hydrogen pump, prolong the overall service life of sealing structure, and also can effectively prevent hydrogen and medium from leaking in static state.

[0028] The utility model is an oil seal used in the related position of hydrogen pump, mainly for the case that hydrogen (or high-pressure gas) and sealing medium are not on the same side. The structure of the utility model mainly consists of rubber, skeleton and PTFE block. The rubber and the skeleton are integrally vulcanized and formed, and after being combined with the installation shell, they play a static sealing role. The PTFE block includes a PTFE seal ring that is press-fitted in the vulcanized body after processing and forming, and a PTFE sheet (i.e. main lip) that extends from the PTFE seal ring and has an included angle of 20°-40° between the axial line in the relaxed state, playing a dynamic sealing role. The thickness of the PTFE sheet is 0.25mm-0.35mm, and the included angle between the PTFE sheet (i.e. main lip) and the axial line in the relaxed state is preferably 32°. Such arrangement makes the PTFE sheet have a smaller holding force on the shaft, which can effectively reduce the wear of the lip and prolong the service life of the PTFE sheet, thereby effectively prolonging the overall service life of the sealing structure.

[0029] Embodiment 2.

[0030] AsFigures 1-2 As shown, the present invention provides a sealing structure for a hydrogen pump, which is installed between the hydrogen pump housing 3 and the hydrogen pump shaft 4. It includes a sealing ring body 1 installed on the hydrogen pump housing 3, and a PTFE sealing sheet 2 disposed on the sealing ring body 1 and integrally fitted with the hydrogen pump shaft 4 for starting the sealing function of the hydrogen pump shaft 4. The PTFE sealing sheet 2 forms an angle of 20°-40° with the axis of the hydrogen pump shaft 4 when it is in the extended state.

[0031] The PTFE sealing sheet 2 includes PTFE sealing sheet section A 6 and PTFE sealing sheet section B 7. PTFE sealing sheet section B 7 has spiral oil return grooves 8 distributed on the surface that is in contact with the hydrogen pump shaft 4.

[0032] Based on Example 1, Example 2 provides a more preferred structure for the PTFE sealing sheet 2, specifically: the PTFE sealing sheet 2 includes a PTFE sealing sheet A section 6 and a PTFE sealing sheet B section 7, and the PTFE sealing sheet B section 7 has spiral oil return grooves 8 distributed on the surface that is in contact with the hydrogen pump shaft 4.

[0033] like Figure 1 The figure in D shows the angle between the PTFE sealing sheet 2 and the axis of the hydrogen pump shaft 4 when the PTFE sealing sheet 2 is in its extended state.

[0034] This utility model of PTFE sealing sheet includes PTFE sealing sheet section A and PTFE sealing sheet section B. PTFE sealing sheet section A is the straight section of the main lip of the PTFE sheet. PTFE sealing sheet section A contacts the shaft and provides a static seal to ensure no leakage occurs when the shaft is stationary. PTFE sealing sheet section B is the spiral return groove section of the main lip. PTFE sealing sheet section B is tightly clamped to the shaft. A spiral oil return groove is provided on the surface of PTFE sealing sheet section B that clamps to the shaft. The depth of the spiral oil return groove is set to 0.07mm-0.13mm to ensure the oil seal's oil return capacity.

[0035] Example 3.

[0036] like Figures 1-2 As shown, the present invention provides a sealing structure for a hydrogen pump, which is installed between the hydrogen pump housing 3 and the hydrogen pump shaft 4. It includes a sealing ring body 1 installed on the hydrogen pump housing 3, and a PTFE sealing sheet 2 disposed on the sealing ring body 1 and integrally fitted with the hydrogen pump shaft 4 for starting the sealing function of the hydrogen pump shaft 4. The PTFE sealing sheet 2 forms an angle of 20°-40° with the axis of the hydrogen pump shaft 4 when it is in the extended state.

[0037] The PTFE sealing sheet 2 includes PTFE sealing sheet section A 6 and PTFE sealing sheet section B 7. PTFE sealing sheet section B 7 has spiral oil return grooves 8 distributed on the surface that is in contact with the hydrogen pump shaft 4.

[0038] The embodiment 3 is based on the embodiment 2, and a more preferred structure of the spiral oil return groove 8 is provided, and the depth of the spiral oil return groove 8 is 0.07mm-0.13mm.

[0039] The PTFE sealing piece B section is a main lip spiral groove part, the PTFE sealing piece B section is tightly held with the shaft, the spiral oil return groove is arranged on the tightly held surface of the PTFE sealing piece B section with the shaft, the depth of the spiral oil return groove is 0.07mm-0.13mm, and the oil seal oil return capacity is ensured.

[0040] Embodiment 4.

[0041] As shown in Figures 1-2 The utility model provides a kind of sealing structure for hydrogen pump, it is installed between hydrogen pump shell 3 and hydrogen pump shaft 4, including the sealing ring main body 1 installed on hydrogen pump shell 3, and the PTFE sealing piece 2 being in sealing ring main body 1 and overall with hydrogen pump shaft 4 is pasted and is used to start the sealing effect of hydrogen pump shaft 4, and the included angle of 20 °-40 ° is formed between PTFE sealing piece 2 and the hydrogen pump shaft 4 axial line in relaxed state.

[0042] The included angle between PTFE sealing piece 2 and the hydrogen pump shaft 4 axial line in relaxed state is 32 °.

[0043] The embodiment 4 is based on the embodiment 1, and a more preferred structure of the PTFE sealing piece 2 is provided, and the included angle between PTFE sealing piece 2 and the hydrogen pump shaft 4 axial line in relaxed state is 32 °.So set, under the premise of guaranteeing effective sealing in use, make PTFE piece have smaller tight force to shaft, so the abrasion of lip can be effectively reduced, prolong the life of PTFE piece, so the overall service life of sealing structure can be effectively prolonged.

[0044] Embodiment 5.

[0045] As shown in Figures 1-2 The utility model provides a kind of sealing structure for hydrogen pump, it is installed between hydrogen pump shell 3 and hydrogen pump shaft 4, including the sealing ring main body 1 installed on hydrogen pump shell 3, and the PTFE sealing piece 2 being in sealing ring main body 1 and overall with hydrogen pump shaft 4 is pasted and is used to start the sealing effect of hydrogen pump shaft 4, and the included angle of 20 °-40 ° is formed between PTFE sealing piece 2 and the hydrogen pump shaft 4 axial line in relaxed state.

[0046] Still include the PTFE sealing ring 5 of press fitting in sealing ring main body 1, PTFE sealing piece 2 and PTFE sealing ring 5 are integral structure, and PTFE sealing piece 2 extends from PTFE sealing ring 5.

[0047] Based on Example 4, this embodiment 5 provides a more preferred structure for the PTFE sealing sheet 2. Specifically, it further includes a PTFE sealing ring 5 press-fitted into the sealing ring body 1. The PTFE sealing sheet 2 and the PTFE sealing ring 5 are an integral structure, and the PTFE sealing sheet 2 extends from the PTFE sealing ring 5. The PTFE sealing ring 5 is press-fitted into the sealing ring body 1, resulting in a stable overall structure, good sealing performance, and stable condition.

[0048] Example 6.

[0049] like Figures 1-2 As shown, the present invention provides a sealing structure for a hydrogen pump, which is installed between the hydrogen pump housing 3 and the hydrogen pump shaft 4. It includes a sealing ring body 1 installed on the hydrogen pump housing 3, and a PTFE sealing sheet 2 disposed on the sealing ring body 1 and integrally fitted with the hydrogen pump shaft 4 for starting the sealing function of the hydrogen pump shaft 4. The PTFE sealing sheet 2 forms an angle of 20°-40° with the axis of the hydrogen pump shaft 4 when it is in the extended state.

[0050] It also includes a PTFE sealing ring 5 press-fitted into the sealing ring body 1, a PTFE sealing sheet 2 and a PTFE sealing ring 5 as an integral structure, and the PTFE sealing sheet 2 extends from the PTFE sealing ring 5.

[0051] The thickness of the PTFE sealing sheet 2 is 0.25mm-0.35mm.

[0052] Based on Example 5, this embodiment 6 provides a more preferred structure for the PTFE sealing sheet 2, specifically: the thickness of the PTFE sealing sheet 2 is 0.25mm-0.35mm. With a PTFE sheet thickness of 0.25mm-0.35mm, the angle between the PTFE sheet (i.e., the main lip) and the axis in its extended state is preferably 32°. This setting results in a smaller clamping force of the PTFE sheet on the shaft, effectively reducing lip wear, extending the PTFE sheet's lifespan, and thus effectively extending the overall service life of the sealing structure.

[0053] Example 7.

[0054] like Figures 1-2 As shown, the present invention provides a sealing structure for a hydrogen pump, which is installed between the hydrogen pump housing 3 and the hydrogen pump shaft 4. It includes a sealing ring body 1 installed on the hydrogen pump housing 3, and a PTFE sealing sheet 2 disposed on the sealing ring body 1 and integrally fitted with the hydrogen pump shaft 4 for starting the sealing function of the hydrogen pump shaft 4. The PTFE sealing sheet 2 forms an angle of 20°-40° with the axis of the hydrogen pump shaft 4 when it is in the extended state.

[0055] The sealing ring body 1 includes a rubber sealing ring 11 and a sealing skeleton 12 disposed within the rubber sealing ring 11.

[0056] The embodiment 7 is based on the embodiment 1, and a more preferred structure of the sealing ring body 1 is provided, and specifically, the sealing ring body 1 comprises a rubber sealing ring 11 and a sealing skeleton 12 arranged in the rubber sealing ring 11.

[0057] Embodiment 8.

[0058] As shown in the figure, the utility model provides a kind of sealing structure for hydrogen pump, is installed between hydrogen pump shell 3 and hydrogen pump shaft 4, including the sealing ring body 1 installed on hydrogen pump shell 3, and PTFE sealing sheet 2 for being arranged on sealing ring body 1 and overall with hydrogen pump shaft 4 and is used to start sealing effect for hydrogen pump shaft 4, PTFE sealing sheet 2 forms 20 °-40 ° angle between hydrogen pump shaft 4 axial line in relaxed state. Figures 1-2 The sealing ring body 1 comprises a rubber sealing ring 11 and a sealing skeleton 12 arranged in the rubber sealing ring 11.

[0059] The rubber sealing ring 11 and the sealing skeleton 12 are integrally vulcanized to form the sealing ring body 1.

[0060] The embodiment 8 is based on the embodiment 7, and a more preferred structure of the sealing ring body 1 is provided, and specifically, the rubber sealing ring 11 and the sealing skeleton 12 are integrally vulcanized to form the sealing ring body 1.

[0061] The utility model discloses a kind of oil seals for being used in hydrogen pump relevant position, mainly show that hydrogen (or high-pressure gas) and sealing medium are not in the same side case. The product structure is mainly composed of rubber, skeleton and PTFE block. The rubber and skeleton are integrally vulcanized, and static sealing effect is generated after being combined with installation shell. PTFE block includes PTFE sealing ring that is pressed in vulcanization body after processing and forming, and PTFE sheet (i.e. main lip) that is extended from PTFE sealing ring and the angle between axial line in relaxed state is 20 °-40 °, generates dynamic sealing effect, the thickness of PTFE sheet is 0.25mm-0.35mm, the angle between PTFE sheet (i.e. main lip) and axial line in relaxed state is preferably 32 °, so as to be provided, so that PTFE sheet has smaller holding force to shaft, so that the wear of lip can be effectively reduced, the service life of PTFE sheet is prolonged, so that the overall service life of sealing structure can be effectively prolonged.

[0062]

[0063] ​The utility model discloses PTFE sealing sheet includes PTFE sealing sheet A section and PTFE sealing sheet B section, and PTFE sealing sheet A section is PTFE sheet main lip straight section portion, and PTFE sealing sheet A section contacts with the shaft, and with the shaft plays static sealing effect, can prevent gas leakage, prevents lubricating oil static leakage simultaneously. PTFE sealing sheet B section is main lip spiral back groove portion, and PTFE sealing sheet B section is embraced tightly with the shaft, and spiral back oil groove is equipped on the surface of PTFE sealing sheet B section and the shaft embrace tightly, and the depth of spiral back oil groove is set 0.07mm-0.13mm, guarantees oil seal oil return capacity. Figure 2 As shown in the figure, M side is lubricating oil side, and N side is hydrogen (or high pressure gas) side, because hydrogen (or high pressure gas) and sealing medium are not in the same side, when pressure is applied, main lip will not open due to pressure increase and thus leakage occurs, and because the utility model embraces the smaller force to the shaft, thus the utility model can run (1000h) for a long time under the working condition of pressure 0.3MPa, the maximum speed of shaft 8000RPM, -40 DEG C~+120 DEG C, and plays effective sealing effect. At present, the effective running time of high pressure sealing structure under the above working condition (sealing medium and high pressure gas are on both sides) is not ideal.

[0064] Finally, it should be pointed out that: the above embodiments are merely the preferred embodiments of the utility model for describing the technical scheme of the utility model, and are not limited to them, and of course, they are not limited to the patent range of the utility model. Any modification or polishing without substantial meaning made on the basis of the main design idea and spirit of the utility model, the technical problems solved are still consistent with the utility model, and should be included in the protection range of the utility model. In addition, the technical scheme of the utility model is directly or indirectly applied to other related technical fields, and the same reason includes in the patent protection range of the utility model.

Claims

1. A seal structure for a hydrogen pump, which is installed between a hydrogen pump housing (3) and a hydrogen pump shaft (4), characterized in that, The sealing ring body (1) is installed on the hydrogen pump shell (3), and the PTFE sealing sheet (2) is arranged on the sealing ring body (1) and is integrally matched with the hydrogen pump shaft (4) and is used for starting the sealing function of the hydrogen pump shaft (4), and the PTFE sealing sheet (2) is formed with an angle of 20-40° between the hydrogen pump shaft (4) and the axial line in the relaxed state.

2. The seal structure for a hydrogen pump according to claim 1, wherein The PTFE sealing sheet (2) includes a PTFE sealing sheet A section (6) and a PTFE sealing sheet B section (7), and the PTFE sealing sheet B section (7) is distributed with a spiral oil return groove (8) on the surface matched with the hydrogen pump shaft (4).

3. The seal structure for a hydrogen pump according to claim 2, wherein The spiral oil return groove (8) has a depth of 0.07-0.13mm.

4. The seal structure for a hydrogen pump according to claim 1, wherein The angle between the PTFE sealing sheet (2) and the axial line of the hydrogen pump shaft (4) in the relaxed state is 32°.

5. The seal structure for a hydrogen pump according to claim 1, wherein The PTFE sealing ring (5) is press-fitted in the sealing ring body (1), the PTFE sealing sheet (2) and the PTFE sealing ring (5) are integrated, and the PTFE sealing sheet (2) extends from the PTFE sealing ring (5).

6. The seal structure for a hydrogen pump according to claim 5, wherein The thickness of the PTFE sealing sheet (2) is 0.25-0.35mm.

7. The seal structure for a hydrogen pump according to claim 1, wherein The sealing ring body (1) includes a rubber sealing ring (11) and a sealing skeleton (12) arranged in the rubber sealing ring (11).

8. The seal structure for a hydrogen pump according to claim 7, wherein The rubber sealing ring (11) and the sealing skeleton (12) are integrally vulcanized and formed into the sealing ring body (1).

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