O-shaped high-pressure sealing ring of pump

Abstract

The utility model relates to the technical field of pump sealing, and discloses a pump O-shaped high-pressure sealing ring which comprises a sealing ring assembly installed in an installation cavity in a pump sealing head. Comprising a mounting column vertically mounted at the bottom of a mounting cavity; the sealing rubber ring sleeves the middle part of the mounting column; the negative pressure hole is formed in the side wall of the mounting column; the mounting sleeve sleeves the upper part of the mounting column; the fixed seat is connected to the top of the mounting sleeve in a sleeving manner, and the fixed seat is mounted above the mounting sleeve; the upper sealing ring and the lower sealing ring are connected to the bottom end of the mounting column in a sleeving manner; and the reset spring is arranged between the upper sealing ring and the lower sealing ring. The pressure bearing capacity is remarkably improved through a triple sealing mechanism (rubber ring deformation, sealing ring and negative pressure adsorption), the sealing rubber ring enables contact pressure to be evenly distributed, and local stress concentration is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump sealing field especially relates to a pump O type high pressure sealing ring. BACKGROUND

[0002] In the fluid delivery system, the sealing ring for pump is the key part of preventing medium leakage. The O type sealing ring widely used at present has the following technical problems under high pressure working condition:

[0003] High pressure sealing failure problem: the traditional O type ring appears "extrusion effect" when the pressure exceeds 10MPa, and the rubber material is extruded into the sealing gap to cause permanent deformation; under pressure fluctuation working condition, the sealing contact pressure distribution is uneven, and the local leakage channel is easily generated; the existing sealing ring lacks positioning structure, and is easily distorted during installation; based on this, we propose a pump O type high pressure sealing ring. CONTENT OF UTILITY MODEL

[0004] In order to solve the technical problem that the sealing effect of the existing sealing ring is poor, the utility model provides a pump O type high pressure sealing ring.

[0005] The utility model adopts the following technical scheme: a pump O type high pressure sealing ring, comprising:

[0006] Pump sealing head, the pump sealing head is internally provided with a mounting cavity; sealing ring assembly, the sealing ring assembly is installed in the mounting cavity inside the pump sealing head;

[0007] It comprises: mounting column, the mounting column is vertically installed at the bottom of the mounting cavity; sealing rubber ring, the sealing rubber ring is sleeved in the middle part of the mounting column; negative pressure hole, the negative pressure hole is arranged on the side wall of the mounting column; mounting sleeve, the mounting sleeve is sleeved on the upper part of the mounting column; fixed seat, the fixed seat is sleeved on the top of the mounting sleeve, and the fixed seat is installed above the mounting sleeve; upper sealing ring and lower sealing ring, the upper sealing ring and the lower sealing ring are sleeved on the bottom end of the mounting column; reset spring, the reset spring is installed between the upper sealing ring and the lower sealing ring.

[0008] As a further improvement of the above scheme, the upper sealing ring and the lower sealing ring are compressed by the reset spring, and the compression density between the upper sealing ring and the lower sealing ring is controlled.

[0009] As a further improvement of the above scheme, the reset spring is a stainless steel wave spring.

[0010] As a further improvement of the above scheme, the upper sealing ring and the lower sealing ring are made of polytetrafluoroethylene material.

[0011] As a further improvement of the above scheme, the sealing ring assembly is vertically fixed in the mounting cavity of the pump sealing head through the mounting column, the reset spring is in a natural stretching state, the upper sealing ring and the lower sealing ring are kept at a proper distance, the sealing rubber ring keeps an initial compression amount, and the basic sealing is formed.

[0012] As a further improvement of the above scheme, the upper sealing ring and the lower sealing ring made of polytetrafluoroethylene material are radially expanded, and the sealing rubber ring realizes the first sealing under the action of the initial pre-tightening force, the reset spring is compressed, and the sealing specific pressure is adjusted.

[0013] As a further improvement of the above scheme, the utility model provides multiple sealing guarantee: first sealing: trapezoidal section deformation of rubber ring; Second sealing: radial expansion of upper sealing ring and lower sealing ring; Third sealing: fluid power sealing generated by negative pressure hole.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The utility model discloses a three-sealing mechanism (rubber ring deformation + sealing ring + negative pressure adsorption) to significantly improve the pressure-bearing capacity, and the sealing rubber ring makes the contact pressure distribution uniform, avoiding local stress concentration.

[0016] 2. The utility model discloses an integrated assembly design to significantly shorten the installation time compared with the traditional method.

[0017] 3. The utility model discloses that the upper sealing ring and the lower sealing ring are made of polytetrafluoroethylene material, the friction coefficient is reduced, and the wear rate is also significantly reduced. DRAWINGS

[0018] Figure 1 It is the whole structure schematic view of the utility model;

[0019] Figure 2 It is the sealing ring assembly connecting structure schematic view of the utility model;

[0020] Figure 3 It is the sealing ring assembly dismounting structure schematic view of the utility model.

[0021] Main symbol explanation:

[0022] 1, pump sealing head;2, sealing ring assembly;21, mounting column;22, sealing rubber ring;23, negative pressure hole;24, mounting sleeve;25, fixed seat;26, upper sealing ring;27, reset spring;28, lower sealing ring. Specific implementation

[0023] Below, combining the drawings and specific implementation, the utility model is further described, and it is explained that under the premise of not conflicting, the following described each embodiment or each technical feature can be combined to form a new embodiment.

[0024] Example 1:

[0025] Please combine Figures 1-3The embodiment provides a pump O-shaped high-pressure sealing ring, which comprises:

[0026] A pump sealing head 1 is internally provided with a mounting cavity;

[0027] A sealing ring assembly 2 is mounted in the mounting cavity in the pump sealing head 1 and comprises:

[0028] A mounting column 21 is vertically mounted at the bottom of the mounting cavity;

[0029] A sealing rubber ring 22 is sleeved at the middle part of the mounting column 21;

[0030] A negative pressure hole 23 is arranged on the side wall of the mounting column 21;

[0031] A mounting sleeve 24 is sleeved on the upper part of the mounting column 21;

[0032] A fixing seat 25 is sleeved on the top of the mounting sleeve 24, and the fixing seat 25 is arranged above the mounting sleeve 24;

[0033] An upper sealing ring 26 and a lower sealing ring 28 are sleeved at the bottom end of the mounting column 21;

[0034] A reset spring 27 is arranged between the upper sealing ring 26 and the lower sealing ring 28.

[0035] It should be noted that the upper sealing ring 26 and the lower sealing ring 28 are made of polytetrafluoroethylene. The sealing ring assembly 2 is vertically fixed in the mounting cavity of the pump sealing head 1 through the mounting column 21, the reset spring 27 is in a natural stretching state, the upper sealing ring 26 and the lower sealing ring 28 are kept at an appropriate interval, the sealing rubber ring 22 keeps an initial compression amount, and basic sealing is formed;

[0036] More specifically, the upper sealing ring 26 and the lower sealing ring 28 made of polytetrafluoroethylene are radially expanded, the sealing rubber ring 22 realizes first sealing under the action of an initial pre-tightening force, and the reset spring 27 is compressed to adjust the sealing specific pressure.

[0037] Further, the reset spring 27 is a stainless steel wave spring.

[0038] Further, the upper sealing ring 26 and the lower sealing ring 28 are compressed through the reset spring 27 to control the compression density between the upper sealing ring 26 and the lower sealing ring 28.

[0039] The utility model discloses specific implementation steps:

[0040] The pump O-shaped high-pressure sealing ring of the utility model realizes reliable sealing under high-pressure working conditions through the innovative pressure self-adapting structure and multiple sealing mechanisms, and the working principle is as follows:

[0041] Initial installation state Figure 1 As shown

[0042] The sealing ring assembly 2 is vertically fixed in the installation cavity of the pump sealing head 1 through the installation column 21, the reset spring 27 is in a natural stretching state, the upper sealing ring 26 pushes the lower sealing ring 28 to keep a proper interval, the sealing rubber ring 22 keeps an initial compression amount, and a basic seal is formed;

[0043] Low-pressure working stage

[0044] The upper sealing ring 26 and the lower sealing ring 28 made of polytetrafluoroethylene material produce radial expansion, the sealing rubber ring 22 realizes the first sealing under the action of an initial pre-tightening force, the reset spring 27 is compressed, and the sealing specific pressure is adjusted;

[0045] Multiple sealing guarantee:

[0046] The first sealing: trapezoidal cross-section deformation of the rubber ring 22;

[0047] The second sealing: radial expansion of the upper sealing ring 26 and the lower sealing ring 28;

[0048] The third sealing: fluid dynamic sealing produced by the negative pressure hole 23.

[0049] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of the utility model protection, and any non-substantial changes and replacements made by the person skilled in the art on the basis of the utility model all belong to the range of the utility model protection.

Claims

1. A pump O-ring high-pressure seal, characterized in that, include: Pump sealing head (1), wherein the pump sealing head (1) is provided with an installation cavity; A sealing ring assembly (2), which is installed in the mounting cavity inside the pump sealing head (1), includes: Mounting post (21), which is vertically mounted at the bottom of the mounting cavity; A sealing rubber ring (22) is fitted onto the middle part of the mounting post (21); Negative pressure hole (23), the negative pressure hole (23) is provided on the side wall of the mounting column (21); Mounting sleeve (24), which is fitted onto the upper part of mounting post (21); A fixing seat (25) is sleeved on the top of the mounting sleeve (24) and the fixing seat (25) is installed above the mounting sleeve (24); The upper sealing ring (26) and the lower sealing ring (28) are fitted onto the bottom end of the mounting post (21); A return spring (27) is installed between the upper sealing ring (26) and the lower sealing ring (28).

2. The pump O-ring high-pressure seal as described in claim 1, characterized in that, The upper sealing ring (26) and the lower sealing ring (28) are made of polytetrafluoroethylene.

3. The pump O-ring high-pressure seal as described in claim 1, characterized in that, The reset spring (27) is a stainless steel wave spring.

4. The pump O-ring high-pressure seal as described in claim 1, characterized in that, The upper sealing ring (26) and the lower sealing ring (28) are compressed by a return spring (27) to control the compression density between the upper sealing ring (26) and the lower sealing ring (28).

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