High-flow low-pressure-difference flow switch

Abstract

The large-flow low-pressure-difference flow switch comprises a valve body, the right end of the valve body is a closed end, a liquid inlet cavity, a valve cavity, a liquid outlet cavity and a plugging cavity are sequentially arranged in the valve body from right to left, the left end of the plugging cavity is an open end, a liquid inlet and a liquid outlet are formed in the valve body, the liquid outlet is perpendicularly communicated with the liquid outlet cavity, and the liquid outlet is communicated with the liquid outlet cavity. An end block is in threaded connection with the interior of the plugging cavity, a mandrel is arranged at the right end of the end block and sleeved with a piston sliding in the axial direction, a supporting spring is arranged between the left end of the piston and the end block, the right end of the piston is arranged in the valve cavity, a circulation gap is formed between the right end of the piston and the valve cavity, and a magnet is arranged in the piston. A magnetic induction switch is arranged on the outer side of the valve body. According to the utility model, the piston is convenient to mount and dismount, the piston axially moves through the arrangement of the mandrel, the accuracy of flow monitoring is ensured, and the direct impact of a high-flow medium on the piston is avoided through the adjustment of the direction of the liquid inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of flow switches, in particular to a large-flow and low-pressure-difference flow switch. Background Art

[0002] Flow switches are mainly used to monitor the flow of media, and are divided into piston flow switches and baffle flow switches. However, piston flow switches such as the Chinese patent document CN216362118U have the following problems when using their piston float components: 1. When the medium flow is large, the impact on the piston float component is large, which is easy to damage the piston float component; 2. When the piston float component moves, it is easy to swing, affecting the accuracy of flow monitoring; 3. The piston float component is not easy to install and disassemble in the valve body. Utility Model Content

[0003] The utility model provides a large-flow and low-pressure differential flow switch. The piston is easy to install and disassemble, and the piston can be moved axially by setting the core shaft to ensure the accuracy of flow monitoring. The direct impact of large-flow medium on the piston is avoided by adjusting the direction of the liquid inlet.

[0004] The technical solution of the utility model is achieved as follows: a large-flow, low-pressure difference flow switch comprises a valve body, the right end of the valve body is a closed end, and the valve body is provided with a coaxial liquid inlet cavity, a valve cavity, a liquid outlet cavity and a blocking cavity from right to left in sequence, the left end of the blocking cavity is an open end, the inner diameters of the liquid inlet cavity, the valve cavity and the liquid outlet cavity increase in sequence, a liquid inlet and a liquid outlet are provided on the valve body, the liquid outlet is vertically connected to the liquid outlet cavity, the liquid inlet is vertically connected to the liquid inlet cavity, an end block is threaded in the blocking cavity, a core shaft is provided at the right end of the end block, an axially sliding piston is mounted on the core shaft, a support spring is provided between the left end of the piston and the end block, the right end of the piston is placed in the valve cavity, and a flow gap is provided between the piston and the valve cavity, a magnet is provided in the piston, and a magnetic induction switch is provided on the outer side of the valve body.

[0005] Furthermore, a column is provided at the right end of the end block, the left end of the core shaft is plugged and connected to the column, and the right end of the core shaft passes through the liquid outlet cavity, the valve cavity and the liquid inlet cavity in sequence, and is plugged and connected to the right end of the valve body. The axial accuracy of the core shaft is ensured by the cooperation between the end block and the valve body, so as to avoid the core shaft shaking when the piston moves.

[0006] Furthermore, a sealing cover is provided at the left end of the end block, and a sealing ring is provided between the sealing cover and the valve body.

[0007] Furthermore, a slide groove is provided on the outer side of the valve body, and a strip hole is provided on the magnetic induction switch, and the strip hole and the slide groove are connected by screws.

[0008] Furthermore, the support spring is sleeved on the outer side of the column, the left end of the support spring abuts against the end block, and the right end abuts against the piston, and the piston is provided with a groove matched with the column. The arrangement of the column facilitates the axial compression and extension of the support spring.

[0009] Beneficial effects of the utility model:

[0010] The liquid outlet of the flow switch of the utility model is vertically connected to the liquid outlet cavity, and the liquid inlet is vertically connected to the liquid inlet cavity, so as to avoid direct impact of large flow medium on the piston, which is beneficial to prolonging the service life of the piston; when the medium flow is small, the medium can directly enter the liquid outlet cavity through the liquid inlet cavity and the flow gap without pushing the piston to move; when the medium flow is large, the medium pushes the piston to move left, the support spring is compressed, and the medium pressure loss is small.

[0011] The utility model facilitates the positioning of the core shaft and ensures its axial accuracy through the cooperation of the end block, the core shaft and the right end of the valve body. On the one hand, it is used to support the piston, and on the other hand, it is used to ensure the axial movement of the piston to avoid deviation when the piston moves, which affects the accuracy of detection. At the same time, the piston is sleeved on the core shaft, and then the core shaft is plugged into the valve body, and finally the end block is installed. When disassembly is required later, the end block is unscrewed, and the core shaft and the piston are pulled out. The overall structure is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0014] Figure 2 for Figure 1 Top view of the .

[0015] Valve body 1, liquid inlet cavity 2, valve cavity 3, liquid outlet cavity 4, liquid inlet 5, liquid outlet 6, blocking cavity 7, piston 8, closed end 9, flow gap 10, magnet 11, support spring 12, slide groove 13, magnetic induction switch 14, bar hole 15, screw 16, end block 17, cover 18, sealing ring 19, column 20, core shaft 21, groove 22. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] The terms "left" and "right" in this utility model are relative to Figure 1 The position relationship shown.

[0018] like Figure 1 As shown, a large-flow and low-pressure difference flow switch comprises a valve body 1, the right end of the valve body 1 is a closed end, and a liquid inlet cavity 2, a valve cavity 3, a liquid outlet cavity 4 and a blocking cavity 7 are arranged in sequence from right to left in the valve body 1, and the left end of the blocking cavity 7 is an open end, the liquid inlet cavity 2, the valve cavity 3, the liquid outlet cavity 4 and the blocking cavity 7 are coaxially arranged, and the inner diameters of the liquid inlet cavity 2, the valve cavity 3 and the liquid outlet cavity 4 increase successively, and a liquid inlet 5 and a liquid outlet 6 are arranged on the valve body 1, and the liquid inlet 5 and the liquid outlet 6 are located on the same side of the valve body 1, the liquid outlet 6 is vertically connected with the liquid outlet cavity 4, and the liquid inlet 5 is vertically connected with the liquid inlet cavity 2. Through the vertical connection arrangement, the impact of the large-flow medium on the piston 8 is reduced, and the service life of the flow switch is extended.

[0019] An end block 17 is threadedly connected to the sealing cavity 7, a sealing cover 18 is fixed to the left end of the end block 17, a sealing ring 19 is installed between the inner side of the sealing cover 18 and the valve body 1, and a column 20 is fixed to the right end of the end block 17. The column 20 is coaxially arranged with the end block 17 and is an integral structure with the end block 17.

[0020] A core shaft 21 is also provided in the valve body 1. The left end of the core shaft 21 is plugged into the column 20, and the right end of the core shaft 21 passes through the liquid outlet cavity 4, the valve cavity 3 and the liquid inlet cavity 2 in sequence, and is plugged into the inner wall of the right end of the valve body 1. The piston 8 is slidably mounted on the core shaft 21. The core shaft 21, the piston 8, the liquid inlet cavity 2, the valve cavity 3 and the liquid outlet cavity 4 are coaxially arranged. The arrangement of the core shaft 21 ensures that the piston 8 moves axially.

[0021] A support spring 12 is provided at the left end of the piston 8. The support spring 12 is sleeved on the outside of the column 20. The left end of the support spring 12 abuts against the end block 17, and the right end abuts against the piston 8. The piston 8 is provided with a groove 22 that cooperates with the column 20. The medium enters the liquid inlet cavity 2 through the liquid inlet 5, pushing the piston 8 to move left, and the support spring 12 is compressed. After the medium stops entering, the support spring 12 extends, pushing the piston 8 to move right and reset.

[0022] The right end of the piston 8 is placed in the valve cavity 3 , and a flow gap 10 is provided between the piston 8 and the valve cavity 3 . The flow gap 10 is coaxially arranged with the piston 8 , and the liquid inlet cavity 2 and the liquid outlet cavity 4 are communicated through the flow gap 10 .

[0023] A magnet 11 is fixed inside the piston 8. Figure 1 and 2 As shown, a slide groove 13 is provided on the outer side of the valve body 1, and a magnetic induction switch 14 is provided at the slide groove 13. The magnetic induction switch 14 belongs to the prior art and can be a reed switch, etc. A bar hole 15 is provided on the magnetic induction switch 14, and the bar hole 15 is connected to the slide groove 13 by a screw 16. Through the arrangement of the slide groove 13 and the bar hole 15, the position of the magnetic induction switch 14 can be adjusted as needed.

[0024] The method of using the large-flow low-pressure difference flow switch is as follows: when the medium flow is small, the medium enters the liquid outlet cavity 4 through the liquid inlet cavity 2 and the flow gap 10; when a large-flow medium is introduced, the medium pushes the piston 8 to move left along the core shaft 21, and the support spring 12 is compressed. When the flow exceeds the set value, the magnetic induction switch 14 senses the magnet 11 and sends a signal; after the medium stops entering, the support spring 12 extends and pushes the piston 8 to move right and reset.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large flow rate and low pressure difference flow switch, comprising a valve body, characterized in that: The right end of the valve body is a closed end, and the valve body is provided with a coaxial liquid inlet cavity, a valve cavity, a liquid outlet cavity and a blocking cavity from right to left. The left end of the blocking cavity is an open end, and the inner diameters of the liquid inlet cavity, the valve cavity and the liquid outlet cavity increase successively. The valve body is provided with a liquid inlet and a liquid outlet, the liquid outlet is vertically connected to the liquid outlet cavity, the liquid inlet is vertically connected to the liquid inlet cavity, an end block is threaded in the blocking cavity, a core shaft is provided at the right end of the end block, an axially sliding piston is mounted on the core shaft, a supporting spring is provided between the left end of the piston and the end block, the right end of the piston is placed in the valve cavity, and a flow gap is provided between the piston and the valve cavity, a magnet is provided in the piston, and a magnetic induction switch is provided on the outside of the valve body.

2. A large flow rate and low pressure difference flow switch according to claim 1, characterized in that: The right end of the end block is provided with a column, the left end of the core shaft is plug-connected with the column, and the right end of the core shaft passes through the liquid outlet cavity, the valve cavity and the liquid inlet cavity in sequence, and is plug-connected with the right end of the valve body.

3. A large flow rate and low pressure difference flow switch according to claim 1 or 2, characterized in that: A sealing cover is arranged at the left end of the end block, and a sealing ring is arranged between the sealing cover and the valve body.

4. A large flow rate and low pressure difference flow switch according to claim 1, characterized in that: A sliding groove is arranged on the outer side of the valve body, a strip hole is arranged on the magnetic induction switch, and the strip hole is connected with the sliding groove through screws.

5. A large flow rate and low pressure difference flow switch according to claim 2, characterized in that: The support spring is sleeved on the outer side of the column, the left end of the support spring abuts against the end block, and the right end abuts against the piston, and the piston is provided with a groove matched with the column.

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