CN218934883U

CN218934883U - Miniature overflow valve

Info

Publication number: CN218934883U
Application number: CN202223370184.XU
Authority: CN
Inventors: 夏兴兰; 臧志成; 潘希伟; 陈兴通; 刘德文
Original assignee: Kailong High Technology Co Ltd
Current assignee: Kailong High Technology Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-04-28
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a miniature overflow valve which is arranged on a urea pump cover and comprises an overflow valve seat, an overflow valve body, an overflow valve spring and an overflow valve sleeve, wherein the overflow valve body, the overflow valve spring and the overflow valve sleeve are sequentially arranged in an inner cavity of the overflow valve seat, the overflow valve sleeve and the overflow valve seat are matched and enclosed into an overflow cavity, a liquid inlet communicated with the overflow cavity is formed in the overflow valve seat, a liquid outlet communicated with the overflow cavity is formed in the overflow valve sleeve, the overflow valve body is pressed against the liquid inlet under the action of the overflow valve spring, and the overflow cavity is opened or closed under the action of fluid hydraulic force and spring force. The miniature overflow valve adopts a plane sealing structure, reduces the processing and assembling difficulty and the manufacturing cost of parts of the overflow valve, well ensures the consistency of products, can flexibly adjust the overflow pressure and the working characteristic of the overflow valve through the relative positions of the overflow valve spring, the overflow valve body and the overflow valve sleeve, has simple structure and low manufacturing cost, and is particularly suitable for an overflow system with compact structure and small flow.

Description

Miniature overflow valve

Technical Field

The utility model relates to the technical field of hydraulic systems, in particular to a miniature overflow valve for a urea solution supply system.

Background

The urea pump for the automobile SCR post-treatment urea solution supply system has the characteristics of small flow and high metering accuracy requirement. In order to ensure stable supply pressure of the urea pump, an overflow valve component is often arranged in the urea pump.

The overflow valve of the existing urea supply pump mostly adopts a ball valve structure, and as shown in fig. 6, the overflow valve device comprises a valve seat 1 ', a valve sleeve 2', a spring 3 'and a steel ball 4', and the control of the overflow valve is realized by opening and closing a liquid feeding hole 5 'on the valve seat 1'. Wherein, the spring 3 ' presses the steel ball 4 ' on the liquid hole 5 ' of the valve seat 1 ' by spring force, so that the liquid hole 5 ' is in a sealed state, and the overflow port of the urea feed pump is closed. When the urea supply pump works, the pressure of urea solution in the flow channel at the front end of the overflow valve rises, and when the upward pressure action of the urea solution borne by the steel ball 4 ' is larger than the spring force, the steel ball 4 ' is lifted under the action of the pressure of the urea solution, the liquid hole 5 ' of the overflow valve is opened, and the urea solution overflows through the overflow valve.

However, due to the limitation of the structural size of the overflow valve and the limitation of the smaller overflow flow of the urea pump supply pump, the overflow structure has small size, high processing precision requirement, high assembly difficulty, high manufacturing cost and difficult guarantee of product consistency.

Disclosure of Invention

Based on the above problems, the utility model aims to provide a miniature overflow valve, which reduces the processing difficulty and the assembly difficulty of overflow valve parts, reduces the manufacturing cost and improves the working reliability of the overflow valve.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a miniature overflow valve is installed on a urea pump cover and comprises an overflow valve seat, an overflow valve body, an overflow valve spring and an overflow valve sleeve, wherein the overflow valve body, the overflow valve spring and the overflow valve sleeve are sequentially installed in an inner cavity of the overflow valve seat, the overflow valve sleeve and the overflow valve seat are matched to form an overflow cavity, a liquid inlet communicated with the overflow cavity is formed in the overflow valve seat, a liquid outlet communicated with the overflow cavity is formed in the overflow valve sleeve, the overflow valve body is pressed against the liquid inlet under the action of an overflow valve spring, and the overflow cavity is opened or closed under the action of fluid hydraulic force and spring force.

Particularly, the liquid inlet hole, the overflow valve body, the overflow valve spring and the overflow valve sleeve are all positioned on the central axis of the inner cavity of the overflow valve seat, the first end face of the overflow valve body is a sealing face, the sealing face is matched with the plane of the end face of the inner wall of the overflow valve seat to form plane seal for the liquid inlet hole, and a boss for limiting the overflow valve spring is arranged on the second end face of the overflow valve body.

Particularly, a plurality of circulation channels are formed in the outer edge of the overflow valve body, the circulation channels penetrate through the sealing surface of the overflow valve body to the second end surface of the overflow valve body, and when the liquid inlet is unblocked, fluid entering from the liquid inlet enters the overflow cavity from the circulation channels along the sealing surface of the overflow valve body.

In particular, the circulation channels are circumferentially and uniformly distributed on the outer edge of the overflow valve body in a semicircular shape.

Particularly, the convex edge is arranged on the end face of the inner wall of the overflow valve seat and surrounds the liquid inlet hole, so that the plane sealing area is reduced.

In particular, the first end face of the relief valve sleeve is open and extends inwardly to form a cavity in which the relief valve spring is embedded, and the end of the inner wall of the cavity faces the end of the relief valve spring and abuts against and limits.

Particularly, a flange is arranged on the outer edge of the second end face of the overflow valve sleeve, a limiting step is arranged on the inner wall of the overflow valve seat corresponding to the flange, the outer edge of the first end face of the overflow valve sleeve is in clearance fit with the inner wall of the overflow valve seat, and the flange is in interference fit with the inner wall of the overflow valve seat and abuts against the limiting step.

In particular, the outer surface of the overflow valve seat is provided with a protruding part pressed into the urea pump cover, one side of the protruding part is provided with a concave part, and the concave part is used for enabling the overflow valve seat to elastically deform when being pressed in.

In particular, the outer surface of the overflow valve seat is provided with a circular arc protrusion which enables the overflow valve to be installed in the urea pump cover in an interference manner.

In summary, compared with the prior art, the miniature overflow valve has the beneficial effects that the miniature overflow valve realizes sealing in a mode that the overflow valve body is abutted against the plane of the overflow valve seat, reduces the processing and assembling difficulty and the manufacturing cost of parts of the overflow valve, well ensures the consistency of products, and simultaneously can flexibly adjust the overflow pressure and the working characteristic of the overflow valve through the relative positions of the overflow valve spring, the overflow valve body and the overflow valve sleeve, has simple structure and low manufacturing cost, and is particularly suitable for an overflow system with compact structure and small flow.

Drawings

FIG. 1 is a schematic diagram of a micro relief valve according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the overflow valve seat in the micro overflow valve according to the embodiment of the utility model;

FIG. 3 is a schematic view of the structure of an overflow valve body in a micro overflow valve according to an embodiment of the present utility model;

FIG. 4 is an end view of an overflow valve body in a micro overflow valve provided in an embodiment of the utility model;

FIG. 5 is a schematic diagram of the overflow valve housing in a micro overflow valve according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of a conventional relief valve.

In the figure:

1-an overflow valve seat; 11-liquid inlet holes; 12-convex edges; 13-limiting steps; 14-a projection; 15-a recess; 16-arc protrusions;

2-overflow valve body; 21-sealing surface; 22-flow-through channels; 23-boss;

3-relief valve spring;

4-overflow valve sleeve; 41-a liquid outlet hole; 42-holding cavity; 43-flange;

1' -valve seat; 2' -valve sleeve; 3' -spring; 4' -steel ball; 5' -liquid hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, mechanically connected, electrically connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Referring to fig. 1 to 5, the present preferred embodiment provides a micro overflow valve, which is mounted on a urea pump cover and comprises an overflow valve seat 1, and an overflow valve body 2, an overflow valve spring 3 and an overflow valve sleeve 4 which are sequentially mounted in an inner cavity of the overflow valve seat 1.

The overflow valve sleeve 4 and the overflow valve seat 1 are matched to form an overflow cavity, a liquid inlet hole 11 communicated with the overflow cavity is formed in the overflow valve seat 1, a liquid outlet hole 41 communicated with the overflow cavity is formed in the overflow valve sleeve 4, the overflow valve body 2 is pressed against the liquid inlet hole 11 under the action of the overflow valve spring 3, and the overflow cavity is opened or closed under the action of fluid hydraulic force and spring force.

In particular, the liquid inlet hole 11, the overflow valve body 2, the overflow valve spring 3 and the overflow valve sleeve 4 are all positioned on the central axis of the inner cavity of the overflow valve seat 1, a tiny gap is formed between the outer edge of the overflow valve body 2 and the overflow valve seat 1, and the overflow valve body 2 can flexibly reciprocate along the central axis direction.

The distance between the relief valve sleeve 4 and the relief valve seat 1 defines the movement path of the relief valve body 2, and the distance between the relief valve sleeve 4 and the relief valve body 2 determines the installation height of the relief valve spring 3, i.e. the magnitude of the spring force. The initial position of the installation of the relief valve spring 3 is in a pre-stressed state, and the pre-stress of the spring is determined according to the opening pressure of the relief valve.

Referring to fig. 3 and 4 in detail, the first end face of the overflow valve body 2 is a sealing face 21, and the sealing face 21 is in plane fit with the end face of the inner wall of the overflow valve seat 1 to form plane seal for the liquid inlet 11. In particular, the flange 12 is provided on the inner wall end surface of the overflow valve seat 1 and around the liquid inlet 11, so as to reduce the planar sealing area, facilitate processing and improve the sealing pressure.

The outer edge of the overflow valve body 2 is provided with a plurality of circulation channels 22, the circulation channels 22 penetrate through from the sealing surface 21 of the overflow valve body 2 to the second end surface of the overflow valve body 2, in particular, the circulation channels 22 are circumferentially and uniformly distributed on the outer edge of the overflow valve body 2 in a semicircular shape, three circulation channels 22 are taken as an example in the figure, when the liquid inlet 11 is unblocked, the fluid entering from the liquid inlet 11 enters into the overflow cavity from the circulation channels 22 along the sealing surface 21 of the overflow valve body 2.

The second end surface of the overflow valve body 2 is provided with a boss 23 for limiting the overflow valve spring 3, as shown in fig. 5, a first end surface of the overflow valve sleeve 4 is opened and extends inwards to form a containing cavity 42 for embedding the overflow valve spring 3, the end part of the inner wall end of the containing cavity 42, which faces the overflow valve spring 3, is abutted and limited, so that the assembly of the overflow valve spring 3 is ensured, and a liquid outlet hole 41 is preferably arranged on the second end surface of the overflow valve sleeve 4.

Specifically, a flange 43 is arranged on the outer edge of the second end face of the overflow valve sleeve 4, a limiting step 13 is arranged on the inner wall of the overflow valve seat 1 corresponding to the flange 43, the outer edge of the first end face of the overflow valve sleeve 4 is in clearance fit with the inner wall of the overflow valve seat 1, and the flange 43 is in interference fit with the inner wall of the overflow valve seat 1 and abuts against the limiting step 13, so that the overflow valve sleeve 4 is convenient to install.

In addition, referring to fig. 2 in detail, a protruding portion 14 pressed into the urea pump cover is arranged on the outer surface of the overflow valve seat 1, a concave portion 15 is arranged on one side of the protruding portion 14, the concave portion 15 is used for enabling the overflow valve seat 1 to elastically deform when being pressed in, the overflow valve is conveniently installed in the urea pump cover, and an arc protrusion 16 enabling the overflow valve to be installed in the urea pump cover in an interference mode is arranged on the outer surface of the overflow valve seat 1, so that the whole overflow valve and the urea pump cover are reliably installed.

In conclusion, the miniature overflow valve realizes sealing in a mode that the overflow valve body is in plane contact with the overflow valve seat, reduces the processing and assembling difficulty and the manufacturing cost of parts of the overflow valve, well ensures the consistency of products, can flexibly adjust the overflow pressure and the working characteristic of the overflow valve through the relative positions of the overflow valve spring, the overflow valve body and the overflow valve sleeve, has a simple structure and low manufacturing cost, and is particularly suitable for an overflow system with compact structure and small flow.

The above embodiments merely illustrate the basic principles and features of the present utility model, and the present utility model is not limited to the above embodiments, but can be variously changed and modified without departing from the spirit and scope of the present utility model, which is within the scope of the present utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a miniature overflow valve, installs on the urea pump lid, its characterized in that, including overflow disk seat and install in proper order overflow valve body, overflow valve spring and overflow valve pocket in the inner chamber of overflow disk seat, the overflow valve pocket with the overflow disk seat is cooperated and is enclosed into the overflow chamber, set up the feed liquor hole with overflow chamber intercommunication on the overflow disk seat, set up the play liquid hole with overflow chamber intercommunication on the overflow valve pocket, the overflow valve body by overflow valve spring effect to the feed liquor hole is pressed, realizes opening or disconnection of overflow chamber under fluid hydraulic and spring force.

2. The micro relief valve of claim 1, wherein: the liquid inlet hole, the overflow valve body, the overflow valve spring and the overflow valve sleeve are all positioned on the central axis of the inner cavity of the overflow valve seat, the first end face of the overflow valve body is a sealing face, the sealing face is in plane fit with the end face of the inner wall of the overflow valve seat to form plane seal for the liquid inlet hole, and a boss for limiting the overflow valve spring is arranged on the second end face of the overflow valve body.

3. The micro relief valve of claim 2, wherein: and when the liquid inlet hole is unblocked, fluid entering from the liquid inlet hole enters the overflow cavity from the circulation channel along the sealing surface of the overflow valve body.

4. A micro relief valve according to claim 3, wherein: the circulating channels are circumferentially and uniformly distributed on the outer edge of the overflow valve body in a semicircular mode.

5. The micro relief valve of claim 2, wherein: convex edges are arranged on the end face of the inner wall of the overflow valve seat and encircle the liquid inlet hole, so that the plane sealing area is reduced.

6. The micro relief valve of claim 1, wherein: the first end face of the overflow valve sleeve is open and extends inwards to form a containing cavity for embedding the overflow valve spring, and the end part of the inner wall end of the containing cavity, which faces the end part of the overflow valve spring, is propped and limited.

7. The micro relief valve according to claim 6, wherein: the flange is arranged on the outer edge of the second end face of the overflow valve sleeve, the limiting step is arranged on the inner wall of the overflow valve seat corresponding to the flange, the outer edge of the first end face of the overflow valve sleeve is in clearance fit with the inner wall of the overflow valve seat, and the flange is in interference fit with the inner wall of the overflow valve seat and abuts against the limiting step.

8. The micro relief valve of claim 1, wherein: the outer surface of the overflow valve seat is provided with a protruding part pressed into the urea pump cover, one side of the protruding part is provided with a concave part, and the concave part is used for enabling the overflow valve seat to elastically deform when being pressed in.

9. The micro relief valve of claim 1, wherein: the outer surface of the overflow valve seat is provided with an arc protrusion which enables the overflow valve to be installed in the urea pump cover in an interference mode.