CN2795589Y - Check valve for pollution discharge pump - Google Patents

Abstract

A check valve for a sewage pump, comprising a valve body, a valve seat assembly, the valve body is connected to the valve seat assembly and forms a cavity for fluid communication inside, two guide rings located in the cavity, and located in the cavity And through the disc assembly of the two guide rings, it is characterized in that: the valve seat assembly includes a valve seat body with a shoulder, an active check, a gasket between the active check and the shoulder, and an active check located between the active check and the shoulder. The O-shaped sealing ring in the movable gap between the mouth and the valve seat body; the disc assembly, which is located in the cavity, consists of the upper and lower discs, the sealing ring arranged between the upper and lower discs, and is used to fix the upper and lower discs and the sealing ring. It consists of fasteners, a valve stem passing through the guide ring and the disc, and a return spring between the upper disc and the guide ring. The utility model has the advantages of good sealing performance, low shut-off noise and long service life when used in the sewage pump containing sandy particles.

Description

Check valve for sewage pump

technical field

The utility model relates to a check valve for a water pump, in particular to a check valve for a low-power sewage pump.

Background technique

The check valve used in the existing water pump is divided into two types of swing type and lifting type according to the action form of the disc. Among them, the swing check valve mainly relies on the opening and closing of the disc in the valve body to realize the one-way flow and shut-off of the fluid. Similarly, the lift check valve relies on the lifting disc in the valve body to open and close up and down to realize the one-way flow and shut-off of fluid. However, when the lift check valve is installed horizontally, and when the outlet of the swing check valve is installed downward, the disc cannot be closed naturally and loses the check function. There is a limitation of the piping installation angle.

At present, the commonly used swing check valves and lift check valves have impact damage to the sealing end face of the check valve due to the shut-off and closure of the valve disc under the action of water hammer when the pump is stopped; the transfer of sandy granular media is prone to seal failure. Inner leakage of the valve; large valve disc area produces large fluid resistance and other deficiencies. The utility model ZL94245136.8 is a multi-purpose check valve which has a simple structure, is convenient to use and is easy to process and manufacture, but has the disadvantages of poor sealing effect and large flow resistance in the use of sandy particle sewage.

Contents of the invention

Therefore, the purpose of this utility model is to overcome the shortcoming of prior art, provide a kind of simple in structure, easy to use and maintain, cheap, easy to install, reliable sealing and the novel check valve that is applicable to band particle sewage transfer pump to use.

In order to achieve the above object, the utility model provides a check valve for a sewage pump, which includes a valve body, a valve seat assembly, the valve body is connected to the valve seat assembly and forms a cavity for fluid communication inside, and a valve located in the cavity Two guide rings, located in the cavity and passing through the disc assembly of the two guide rings, are characterized in that: the valve seat assembly includes a valve seat body with a shoulder, a movable stop, a movable stop and a shoulder The gasket between them, and the O-shaped sealing ring located in the movable gap between the movable spigot and the valve seat body; the disc assembly, which is located in the cavity, consists of the upper and lower valve discs, the sealing ring arranged between the upper and lower discs, It consists of fasteners for fixing the upper and lower discs and sealing rings, a valve stem passing through the guide ring and the disc, and a return spring between the upper disc and the guide ring.

Preferably, the inner cavity of the movable spigot is in a truncated inverted conical structure, the upper and lower discs are in a truncated conical structure corresponding to the movable sill, and the valve stem in the valve clack assembly is guided along the guide ring. radial movement.

Preferably, the valve seat body at the inlet of the check valve is provided with internal and external threads, and the valve body at the outlet is also provided with internal and external threads, which can match the threaded opening or flange of the pipe.

The utility model has the advantages of: 1) Since a washer is provided at the joint between the valve seat body and the movable spigot, the movable spigot can buffer and absorb the instantaneous impact of the water hammer to a certain extent, thereby improving the service life of the check valve ; 2) Due to the setting of the conical valve disc and valve seat assembly, the characteristics of the medium flowing around the surface of the conical seal are used to prevent the retention of sediment particles in the medium on the sealing end surface, which can ensure the effective one-way blocking of the fluid. It is suitable for the use of sandy sewage; 3) Since the valve stem type disc assembly can only move radially along the guide ring, and due to the setting of the return spring, the check valve has the characteristics of automatic closing and correct fall, and is not affected by The limitation of the installation angle of the piping; 4) Since the valve clack just enters the active seam and cooperates with it in the closed state, that is, the cross-sectional area of the valve clack is smaller than the active seam, so the pressure loss of the valve is small.

Description of drawings

Fig. 1 is a cross-sectional view of a check valve for a sewage pump in a preferred embodiment of the present invention;

Detailed ways

The check valve of the present utility model will be further described below in conjunction with the accompanying drawings and a preferred embodiment.

As shown in Figure 1, the check valve of the present invention includes a valve body 1 and a conical valve seat assembly 2 with cushioning, wherein the valve seat assembly 2 is truncated by a valve seat body 21 having a shoulder 211 and an inner cavity 221. An inverted conical movable mouth 22, a buffer rubber gasket 23 located between the movable seam 22 and the shoulder 211, and an O-ring 24 located in the movable gap 25 between the active seam 22 and the valve seat body 21; The valve body 1 is connected with the cushioned conical valve seat assembly 2 to form an internal cavity 3; Between the two guide rings 5, the inlet and outlet 31, 32 of the valve cavity 3 are on the same axis. The valve stem 41 is relatively radially fixed by the two guide rings 5, and can only slide axially. The rod-type conical disc assembly 4 is composed of a valve stem 41, a conical lower disc 42, a rubber sealing ring 43, a conical upper disc 44, a fixing nut 45 and a return spring 46, and the rubber sealing ring 43 is clamped on the conical Between the lower valve disc 42 and the conical upper valve disc 44, and sleeved on the valve stem 41 and fastened by the fixed nut 45, the return spring 46 is arranged between the guide ring 5 and the valve disc 44, under the force of the spring , so that the rod-type conical disc assembly 4 equipped with a sealing ring 43 is in contact with the movable stop 22 of the conical valve seat assembly 2 with a buffer to form a seal.

When the medium passes through the check valve in the direction of arrow A, the return spring 46 is compressed, the rod-type conical disc assembly 4 slides upward, and the check valve is in an open state. When the pump stops, the rod-type conical disc assembly 4 moves downward due to the force of the water hammer, and instantly impacts the movable seam 22, and the buffer rubber gasket 23 is pressed to make the entire movable seam 22 move down, absorbing and reducing The impact force is effectively protected, so that the sealing section of the check valve is effectively protected. The O-ring 24 can prevent fine particles from entering the movable gap between the movable stop 22 and the valve seat body 21. Under the action of the return spring 46, the conical valve disc 42 is in good contact with the movable spigot 22 of the valve seat assembly 2 to form a good one-way seal of the valve.

In this preferred embodiment, the check valve is provided with an internal thread 212 and an external thread 213 on the valve seat body 21 at the inlet 31, and an internal thread 11 and an external thread 12 are also provided on the valve body at the outlet 32, which can Matches the threaded port or flange of the piping.

Through practice, the check valve of the utility model has good sealing performance, no internal leakage, high efficiency and energy saving, low valve shut-off noise and long service life in the use of sandy particle sewage pumps. To avoid failures such as general check valve due to internal leakage, the sewage pump does not produce water, the pump reverses and the discharged water returns to the drainage pit, etc., which can ensure the long-term normal drainage of the sewage pump. It is suitable for sewage discharge occasions in environmental protection, metallurgy, chemical industry, aquaculture and other industries.

Claims (5)

1. pollution discharge pump safety check, comprise that valve body, valve component, described valve body are connected with valve component and form in inside fluid flow cavity, be positioned at two guide rings of cavity, be positioned at this cavity and pass the flap assembly of described two guide rings, it is characterized in that: this valve component comprises the valve seat body with shoulder, movable seam, the packing ring between movable seam and shoulder and is positioned at movable seam and the O-ring seals of the free gap of valve seat body; The flap assembly, it is positioned at cavity, by last lower Disc, be arranged at seal ring between the lower Disc, be used for fixing lower Disc and seal ring fastening piece, pass the valve rod of guide ring and flap, the Returnning spring between last flap and guide ring is formed.

2. safety check as claimed in claim 1 is characterized in that, the inner chamber of described movable seam is truncated inverted cone shape structure.

3. safety check as claimed in claim 2 is characterized in that, the described lower Disc of going up is and the corresponding frusto-conical configuration of movable seam.

4. safety check as claimed in claim 1 is characterized in that, the valve rod in the described flap assembly moves radially along guide ring.

5. safety check as claimed in claim 1 is characterized in that, described safety check is provided with internal and external threads on the valve seat body of inlet, also is provided with internal and external threads on the valve body in outlet port, can be complementary with the silk mouth or the flange of pipe arrangement.

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