阅读说明：本技术 常开型隔膜止回阀 (Normally open diaphragm check valve ) 是由 王跃 梁丹 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种常开型隔膜止回阀,包括阀体,阀体上设置有进水口和出水口,阀体内部下端设置有一体成型设计的阀座,阀座上设置有通孔,通孔上设置有吻合的堵头,堵头上端和阀杆连接,出水口上连通连接有第一连接管,第一连接管一端与出水口连通连接,第一连接管另一端和阀体上端连通连接,第一连接管上设置有针阀；阀芯上套装有弹簧,弹簧下端和下弹簧座连接,弹簧上端和上弹簧座连接,上弹簧座和阀芯连接,阀芯上端和隔膜片连接。本发明使用水箱变频供水时,本发明阀门处于常开状态,不会让水泵吸口水阻过大,不会产生负压状态,保证了水泵的使用功能。(The invention discloses a normally-open type diaphragm check valve which comprises a valve body, wherein a water inlet and a water outlet are formed in the valve body, an integrally-formed valve seat is arranged at the lower end in the valve body, a through hole is formed in the valve seat, an anastomotic plug is arranged on the through hole, the upper end of the plug is connected with a valve rod, a first connecting pipe is connected to the water outlet in a communicating manner, one end of the first connecting pipe is connected to the water outlet in a communicating manner, the other end of the first connecting pipe is connected to the upper end of the valve body in a; the valve core is sleeved with a spring, the lower end of the spring is connected with a lower spring seat, the upper end of the spring is connected with an upper spring seat, the upper spring seat is connected with the valve core, and the upper end of the valve core is connected with a diaphragm. When the water tank is used for variable-frequency water supply, the valve is in a normally open state, so that excessive water resistance of a suction port of the water pump cannot be caused, a negative pressure state cannot be generated, and the use function of the water pump is ensured.)

1. Normally open type diaphragm check valve, including the valve body, be provided with water inlet and delivery port on the valve body, the inside lower extreme of valve body is provided with the disk seat of integrated into one piece design, is provided with the through-hole on the disk seat, is provided with anastomotic end cap on the through-hole, and its characterized in that is connected to end cap upper end and valve rod: a first connecting pipe is connected to the water outlet in a communicating manner, one end of the first connecting pipe is connected to the water outlet in a communicating manner, the other end of the first connecting pipe is connected to the upper end of the valve body in a communicating manner, and a needle valve is arranged on the first connecting pipe; the valve core is sleeved with a spring, the lower end of the spring is connected with a lower spring seat, the upper end of the spring is connected with an upper spring seat, the upper spring seat is connected with the valve core, and the upper end of the valve core is connected with a diaphragm.

2. The normally open diaphragm check valve of claim 1, wherein: the bottom end of the valve body is provided with an inspection opening, and a sealing plug is arranged on the inspection opening.

3. The normally open diaphragm check valve of claim 1 or 2, wherein: the upper end of the valve body is communicated with a second connecting pipe, and a ball valve is arranged on the second connecting pipe.

4. The normally open diaphragm check valve of claim 1, wherein: the lower spring seat is fixed in the center of the lower partition plate, and the lower partition plate is connected with the inner wall of the valve body.

5. The normally open diaphragm check valve of claim 1 or 2, wherein: an upper partition plate is arranged in the valve body, a round hole is formed in the center of the upper partition plate, and the edge of the upper partition plate is connected with the inner wall of the valve body.

6. The normally open diaphragm check valve of claim 1, wherein: and the diaphragm sheet is provided with a diaphragm block.

Technical Field

The invention relates to the field of tap water control, in particular to a normally-open diaphragm check valve.

Background

At present, secondary water supply adopts three main modes: 1. the pressurizing equipment is combined with the high-level water tank, 2, the water tank supplies water by frequency conversion and speed regulation, and 3, the direct pumping pipe network supplies water without negative pressure (pressure-superposed water supply). The secondary water supply for residents mostly adopts the latter two water supply modes. Along with the expansion of cities, higher requirements are provided for the water supply capacity of a tap water company, and for the purpose of relieving the water supply capacity of the tap water company, a scheme is provided for combining the variable-frequency water supply mode and the non-negative-pressure water supply mode of the water tank, and the two water supply modes are mutually converted under the unattended condition by applying an automation technology. At present, the PLC control program is used for controlling a plurality of electric valves to realize the conversion of two water supply modes, which is a feasible scheme. However, once a power failure occurs in a single pump room or a city block, and each control electric valve is in a half-open state, water in the municipal tap water pipe network may flow back into the water tank from the water outlet pipeline of the water tank, and then the water tank overflows, so that a pump room flooding accident occurs. The check valve can be installed at the water tank outlet pipe by someone, however, ordinary check valve all needs certain valve opening pressure, when the water tank of normal use supplies water, the liquid level is the highest just two meters in the water tank, let the check valve opening pressure of installing at water tank outlet pipe way again offset partly, the water pump suction inlet is probably produced the negative pressure very much when the pump package operation, leads to the possibility greatly increased of water pump cavitation, influences water pump life. The existing check valves are all normally closed check valves, such as patent 2019210682645.

Disclosure of Invention

Technical problem to be solved

In order to solve the problems in the background art, the invention provides a normally open type diaphragm check valve, which aims to: the hydraulic valve automatic opening and closing function is realized, the manual operation valves are reduced, and the unattended function of a secondary water supply pump house is realized.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme:

normally open type diaphragm check valve, including the valve body, be provided with water inlet and delivery port on the valve body, the inside lower extreme of valve body is provided with the disk seat of integrated into one piece design, is provided with the through-hole on the disk seat, is provided with anastomotic end cap on the through-hole, and its characterized in that is connected to end cap upper end and valve rod: a first connecting pipe is connected to the water outlet in a communicating manner, one end of the first connecting pipe is connected to the water outlet in a communicating manner, the other end of the first connecting pipe is connected to the upper end of the valve body in a communicating manner, and a needle valve is arranged on the first connecting pipe; the valve core is sleeved with a spring, the lower end of the spring is connected with a lower spring seat, the upper end of the spring is connected with an upper spring seat, the upper spring seat is connected with the valve core, and the upper end of the valve core is connected with a diaphragm.

As the preferable scheme of the previous step, the bottom end of the valve body is provided with an inspection opening, and a sealing plug is arranged on the inspection opening.

As the preferable scheme of the previous step, the upper end of the valve body is communicated and connected with a second connecting pipe, and a ball valve is arranged on the second connecting pipe.

As the preferable scheme of the previous step, the lower spring seat is fixed in the center of the lower partition plate, and the lower partition plate is connected with the inner wall of the valve body.

As the preferable scheme of the previous step, an upper partition plate is arranged in the valve body, a round hole is formed in the center of the upper partition plate, and the edge of the upper partition plate is connected with the inner wall of the valve body.

As a preferable scheme of the previous step, a diaphragm block is arranged on the diaphragm sheet.

(III) advantageous effects

The invention provides a normally open type diaphragm check valve, which has the following beneficial effects:

1. when the water tank is used for variable-frequency water supply, the valve is in a normally open state, so that excessive water resistance of a suction port of the water pump cannot be caused, a negative pressure state cannot be generated, and the use function of the water pump is ensured.

2. When the non-negative pressure water supply mode is used, the valve can realize the function that water flow cannot flow back into the water tank under the action of the self water force of tap water, and the safety of secondary water supply pump house equipment is ensured.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic diagram of a position frame for use with the present invention;

the device comprises a valve body 1, a valve body 2, a water inlet 3, a water outlet 4, a first connecting pipe 5, a needle valve 6, a second connecting pipe 7, a ball valve 8, a diaphragm sheet 9, a diaphragm block 10, a valve core 11, a plug 12, a through hole 13, an upper spring seat 14, a spring 15, an upper partition plate 16, a lower partition plate 17, a valve seat 18, an inspection opening 19, a sealing plug 20 and a lower spring seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.