Valve seat of disc valve

Abstract

The utility model discloses a disc valve seat which is composed of a core sleeve and an outer sheath, the hardness of the material of the core sleeve is larger than that of the material of the outer sheath, the toughness of the material of the outer sheath is larger than that of the material of the core sleeve, and the core sleeve is pressed in the outer sheath in an interference fit mode. The core sleeve is made of a hard alloy material, and the outer sheath is made of a common steel material. And a surfacing layer formed by welding is arranged on the bottom end face of the outer sheath. And the overlay welding layer is used for welding and connecting the outer sheath and the core sleeve at the joint part of the outer sheath and the core sleeve. The valve seat has the advantages that the core sleeve which is prone to embrittlement is protected by the outer sheath with good toughness, the defect that hard alloy is prone to embrittlement in the machining, assembling and using processes in the prior art is overcome, and the abrasion resistance of the friction portion of the valve seat can be guaranteed through the core sleeve with large hardness.

Description

TECHNICAL FIELD

[0001] The utility model relates to a disc valve seat and belongs to the technical field of valves. BACKGROUND

[0002] A valve seat of a disc valve, one end face of which repeatedly rotates and rubs against a mating piece under pressure during use, is made of hard alloy in the prior art to improve wear resistance. Since hard alloy is hard and brittle, and its price is higher than that of general steel, the following defects exist when the valve seat is directly made of hard alloy:

[0003] 1. Poor stability, brittle fracture often occurs during machining, assembly and use, resulting in rejection of workpieces or products;

[0004] 2. High cost. SUMMARY

[0005] The utility model solves the technical problem of how to improve the stability of the valve seat and avoid brittle fracture during machining, assembly and use.

[0006] To solve the above problems, the technical solution provided by the utility model is as follows:

[0007] A disc valve seat is composed of a core sleeve and an outer sleeve, the hardness of the core sleeve is greater than that of the outer sleeve, the toughness of the outer sleeve is greater than that of the core sleeve, and the core sleeve is press-fitted in the outer sleeve in an interference fit.

[0008] An annular stop groove is arranged on the inner wall of the outer sleeve, a stop flange is arranged on the outer periphery of the core sleeve, and the stop flange arranged on the core sleeve of the assembled valve seat is pressed on the stop groove.

[0009] A weld overlay layer is welded on the bottom end face of the outer sleeve. The weld overlay layer connects the outer sleeve and the core sleeve at the joint between the outer sleeve and the core sleeve.

[0010] The weld overlay layer connects the outer sleeve and the core sleeve at the bottom end joint between the outer sleeve and the core sleeve.

[0011] The bottom end face of the weld overlay layer and the bottom end face of the core sleeve are on the same plane.

[0012] The core sleeve is made of hard alloy material.

[0013] The outer sleeve is made of plain steel material. ADVANTAGEOUS EFFECTS

[0014] 1. The outer sleeve with good toughness protects the brittle core sleeve, which not only overcomes the defect of brittle fracture of the hard alloy used in the prior art during machining, assembly and use, but also ensures the wear resistance of the friction part of the valve seat by the core sleeve with high hardness.

[0015] 2. It reduces the amount of cemented carbide used, saving material costs. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the valve seat described in Embodiment 1;

[0017] Figure 2 This is a cross-sectional schematic diagram of the valve seat described in Embodiment 1;

[0018] Figure 3 This is a sectional view of the valve seat described in Embodiment 1.

[0019] Figure 4 This is a cross-sectional schematic diagram of the valve seat described in Embodiment 2.

[0020] In the figure: 1. Outer sleeve; 101. Stop platform; 2. Core sleeve; 201. Stop flange; 3. Weld overlay. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0022] like Figure 1 As shown in Figure 3, a disc valve seat comprises a core sleeve 2 and an outer sheath 1. The core sleeve 2 is made of a material with a higher hardness than the outer sheath 1, while the outer sheath 1 is made of a material with higher toughness than the core sleeve 2. The core sleeve 2 is press-fitted into the outer sheath 1 with an interference fit, and the outer sheath 1, with its better toughness, protects the easily brittle core sleeve 2. This overcomes the shortcomings of existing technologies that use hard alloy as a whole, which are prone to brittle fracture during processing, assembly, and use, while also ensuring the wear resistance of the friction parts of the valve seat by the harder core sleeve 2.

[0023] Preferably, the core sleeve 2 is made of hard alloy material to ensure the wear resistance of the valve seat.

[0024] As a preferred option, the outer sheath 1 is made of ordinary steel to ensure the toughness of the entire valve seat.

[0025] This satisfies the requirements for seat valve hardness and toughness while reducing the amount of hard alloy used, thus saving material costs.

[0026] An annular stop plate 101 is provided on the inner wall of the outer sleeve 1, and a stop flange 201 is provided on the outer periphery of the core sleeve 2. When the valve seat is assembled, the stop flange 201 on the core sleeve 2 presses against the stop plate 101. When the outer sleeve 1 and the core sleeve 2 are pressed together, and the stop flange 201 cannot be pressed further down on the stop plate 101, it proves that the bottom end face of the outer sleeve 1 and the bottom end face of the core sleeve 2 are flush. Example 2

[0027] As Figure 4 shown, it is a further improvement of the first embodiment, the bottom end surface of the outer sheath 1 has a welded surfacing layer 3, the bottom end surface of the surfacing layer 3 is in a plane with the bottom end surface of the core sleeve 2, so as to improve the wear resistance of the bottom end surface of the outer sheath 1, and can enhance the wear resistance of the whole valve seat together with the hard alloy core sleeve.

[0028] Further, the surfacing layer 3 welds the outer sheath 1 and the core sleeve 2 at the joint of the outer sheath 1 and the core sleeve 2, so as to enhance the integration of the joint between the outer sheath 1 and the core sleeve 2.

[0029] The above embodiments are only used for more clearly describing the utility model, and cannot be regarded as limiting the protection scope covered by the utility model, and any equivalent modification shall be regarded as falling into the protection scope covered by the utility model.

Claims

1. A disc valve seat, characterised in that: It is composed of a core sleeve (2) and an outer sleeve (1), the hardness of the material of the core sleeve (2) is greater than that of the outer sleeve (1), the toughness of the material of the outer sleeve (1) is greater than that of the core sleeve (2), and the core sleeve (2) is press-fitted into the outer sleeve (1) in an interference fit.

2. The disc valve seat according to claim 1, characterized in that: An annular stop flange (201) is arranged on the outer periphery of the core sleeve (2), and an annular stop platform (101) is arranged on the inner wall of the outer sleeve (1), and the stop flange (201) of the core sleeve (2) is pressed on the stop platform (101) after assembly.

3. The disc valve seat of claim 1, wherein: A welding layer (3) is welded on the bottom end surface of the outer sleeve (1), and the welding layer (3) is welded and connected to the outer sleeve (1) and the core sleeve (2) at the joint between the outer sleeve (1) and the core sleeve (2).

4. The disc valve seat according to claim 3, characterized in that: The welding layer (3) is welded and connected to the outer sleeve (1) and the core sleeve (2) at the joint between the outer sleeve (1) and the core sleeve (2).

5. The disc valve seat according to claim 3, wherein: The bottom end surface of the welding layer (3) and the bottom end surface of the core sleeve (2) are on the same plane.

6. Disc valve seat according to any one of claims 1 - 5, characterized in that: The core sleeve (2) is made of hard alloy material.

7. The disc valve seat according to claim 6, characterized in that: The outer sleeve (1) is made of plain steel material.

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