CN108169799B

CN108169799B - Fluid sensing device

Info

Publication number: CN108169799B
Application number: CN201810095349.6A
Authority: CN
Inventors: 唐台英
Original assignee: Guangzhou Seagull Housing Industry Co ltd
Current assignee: Guangzhou Seagull Housing Industry Co ltd
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2024-04-30
Anticipated expiration: 2038-01-31
Also published as: CN108169799A

Abstract

The invention discloses a fluid sensing apparatus, which is arranged in a flow path for fluid to flow, comprising: a base fixed in the flow path; the piston core rod is arranged in the base and is connected with the base through an elastic component, and a pushing surface for pushing fluid in the flow path is arranged on the piston core rod; a magnet disposed on the plunger rod; a magnetic induction device provided on a side surface of the plunger rod to induce a magnetic force line variation value received as the position of the magnet varies, thereby determining whether or not a fluid flows in the flow path; wherein the elastic member is disposed such that a direction of a restoring force thereof is opposite to a fluid flow direction in the flow path. The invention has fewer parts, is easier to produce, and can reduce judgment difference caused by small fluid flow rate.

Description

Fluid sensing device

Technical Field

The present invention relates to an induction device. More particularly, the present invention relates to a fluid sensing apparatus.

Background

Currently, fluid sensing devices are commonly used that include impeller blades through which a fluid flows, and the fluid applies a force to the impeller blades that causes the impeller to rotate. Some impeller blades are provided with magnetism, or some impeller blades are connected with a magnetic block at one end, when the impeller rotates, the magnetic field generated by the impeller is changed, and the magnetic induction device senses the change of the magnetic field to judge whether the fluid in the flow path is in a flowing state.

Such techniques have the following drawbacks: the material of the impeller blades themselves is special and expensive, and the magnetic material involves water, many related authentications being difficult to obtain. In addition, one end of some impeller blades is connected with a magnetic block, so that more parts are needed, and the space is required to be large. Generally, when the fluid flow rate is small, the impeller blades cannot rotate, or the rotating speed is too slow, and the magnetic induction device cannot sense the change of the magnetic field, so that judgment difference or judgment error is caused.

Disclosure of Invention

The invention aims to provide a fluid sensing device which is used for judging whether fluid passes through or not by utilizing the linear displacement change of a magnet and detecting the change of a magnetic field through a magnetic force probe or a magnetic induction device.

Instead of using the rotation change of the magnet, the magnetic probe detects the change of the magnetic field to determine whether there is a water flow passing through.

To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a fluid sensing apparatus provided in a flow path through which a fluid flows, comprising:

a base fixed in the flow path;

The piston core rod is arranged in the base and is connected with the base through an elastic component, and a pushing surface for pushing fluid in the flow path is arranged on the piston core rod;

a magnet disposed on the plunger rod; and

A magnetic induction device provided on a side surface of the plunger rod to induce a magnetic force line variation value received as the position of the magnet varies, thereby determining whether or not a fluid flows in the flow path;

wherein the elastic member is disposed such that a direction of a restoring force thereof is opposite to a fluid flow direction in the flow path.

Preferably, the fluid sensing apparatus further comprises:

The pipe body is fixed on the flow path along the flow direction of the fluid in the flow path, a channel for the fluid in the flow path to flow through is arranged in the pipe body, the base and the piston core rod are both positioned in the pipe body, the base is fixed on the pipe body and is fixed in the flow path through the pipe body, and the magnetic induction device is arranged on the outer wall of the pipe body.

Preferably, in the fluid sensing apparatus, the base is hollow, and the interior thereof is in communication with the downstream end of the tube body in the fluid flow direction therein, a first through hole is provided in the base, the elastic member is located in the base, the elastic member is configured to be compressed in the fluid flow direction in the tube body, the plunger rod is disposed in the fluid flow direction in the tube body, and the upstream end thereof in the fluid flow direction in the tube body passes through the first through hole and is located outside the base, the plunger rod is connected to the base by the elastic member at the downstream end thereof in the fluid flow direction in the tube body in the interior of the base, the pushing surface is located at the upstream end thereof in the fluid flow direction in the tube body, the upstream end thereof in the fluid flow direction in the tube body is composed of a first portion and a second portion, the second portion is capable of passing through the first through hole in the fluid flow direction in the tube body and is in clearance fit with the first through hole, and the first portion is incapable of passing through the first through hole.

Preferably, in the fluid sensing apparatus, the first portion and the second portion are cylindrical and coaxially arranged, the first portion and the tube body are in clearance fit, the first portion and the second portion are hollow, and are mutually communicated, at least one first opening is arranged on a bottom surface of the first portion far away from the second portion, each first opening is communicated with the interior of the first portion, at least one second opening is arranged on a side wall of the second portion, each second opening is communicated with the interior of the second portion, and the second openings are as follows: when the first part moves along the fluid flow direction in the pipe body to be propped against the base, the second opening is all positioned in the base, and the interior of the second part is communicated with the interior of the base through the second opening.

Preferably, in the fluid sensing apparatus, the base is provided with a second through hole, a downstream end of the plunger rod along a fluid flow direction in the tube body passes through the second through hole, and the fluid sensing apparatus is composed of a third portion and a fourth portion, the third portion is located in the base, a cross section of the third portion is smaller than a cross section of the second portion, the fourth portion passes through the second through hole and is located outside the base, and the second through hole is set as follows: when the piston core rod moves along the fluid flow direction in the pipe body, the second through hole is in clearance fit with the third part, the elastic component is a spring, the piston core rod is connected with the base through the spring in the base through the third part, the spring is sleeved on the third part, and two ends of the spring are respectively propped against the base and the second part.

Preferably, in the fluid sensing apparatus, the third portion is cylindrical, the fourth portion gradually increases in diameter toward the third portion to be equal to the diameter of the third portion, and the third portion and the fourth portion are coaxially disposed with the second portion, respectively.

Preferably, in the fluid sensing apparatus, a protrusion is disposed on a side wall of the fourth portion, and the protrusion is set as follows: when the third part is located the base, protruding and base offset, be provided with the breach on the fourth part, the breach sets up along the axis direction of fourth part, and runs through the fourth part and extend to in the third part, the breach sets up to: when the notch is tightened, both the fourth portion and the protrusion can pass through the second through hole.

Preferably, in the fluid sensing apparatus, the base has two bottom surfaces parallel to each other, the base is in seamless connection or clearance fit with the inner wall of the pipe body through the side wall of the base, the first through hole and the second through hole are respectively located on the two bottom surfaces of the base, at least one third opening is formed in the bottom surface of the base, and the interior of the base is communicated with the downstream end of the pipe body along the fluid flowing direction therein through the third opening.

Preferably, in the fluid sensing apparatus, the specific manner of fixing the base on the pipe body is:

The upstream end and the downstream end of the pipe body along the fluid flowing direction in the pipe body are hollow cylinders, the pipe body is coaxially arranged, the inner diameter of the pipe body at the upstream end along the fluid flowing direction in the pipe body is larger than that of the downstream end, the base is clamped in the pipe body at the upstream end along the fluid flowing direction and is in seamless connection with the pipe body at the upstream end along the fluid flowing direction, the bottom surface provided with the second through hole on the base is placed on the pipe body at the downstream end along the fluid flowing direction, and the downstream end of the pipe body at the fluid flowing direction is not sealed with the third opening.

Preferably, in the fluid sensing apparatus, the number of the second openings is equal to the number of the third openings, and the second openings are plural, and the second openings are disposed at intervals along the circumferential direction of the second portion, and when the second openings are located in the base, the second openings are opposite to the third openings one by one.

Preferably, in the fluid sensing apparatus, the base is formed by an integrally formed upper portion and a lower portion, the upper portion and the lower portion of the base are hollow cylinders, and are mutually communicated and coaxially arranged with the pipe body, the first through hole is formed on a bottom surface of the upper portion of the base, the second through hole is formed on a bottom surface of the lower portion of the base, outer diameters of the second portion and the third portion are smaller than inner diameters of the upper portion and the lower portion of the base, an outer side wall of the lower portion of the base is not in contact with an inner side wall of the pipe body, an inner diameter of a downstream end of the pipe body located in a fluid flowing direction is smaller than an outer diameter of the lower portion of the base and is larger than an inner diameter of the lower portion of the base, a plurality of fourth openings are arranged on a side wall of the lower portion of the base at intervals along a circumferential direction of the side wall of the lower portion of the base, the fourth openings are equal in number to the third openings and correspond to each other, the third openings are arranged along an edge of the bottom surface of the lower portion of the base at intervals, the fourth openings penetrate through a side wall of the lower portion of the base and are communicated with the corresponding third openings, and the fourth openings are arranged as follows: when the second openings are positioned in the base, the second openings are opposite to the fourth openings one by one, and the base is in seamless connection with the upstream end, positioned in the fluid flow direction, of the pipe body through the upper part of the base.

Preferably, in the fluid sensing apparatus, the magnet is embedded and sealed on the plunger rod.

Preferably, in the fluid sensing apparatus, the second opening is elongated and penetrates through a sidewall of the second portion along a length direction of the second portion.

Preferably, in the fluid sensing apparatus, the base is provided with a pressure relief hole, and the pressure relief hole is respectively communicated with an upstream end of the tube body along the fluid flowing direction therein and an inside of the base.

The pipe body with the base is inside hollow cylinder, and coaxial setting, has the clearance between the lateral wall of base and the inside wall of pipe body, be provided with a plurality of supporting shoe along its circumferencial direction interval on the inside wall of pipe body, be provided with the bottom surface of second through-hole on the base and shelve on a plurality of supporting shoe, the supporting shoe does not seal the third opening, be provided with many connecting rods along the circumferencial direction interval of base between the inside wall of pipe body and the outside wall of base, the one end and the inside wall fixed connection of pipe body of every connecting rod, the other end offsets with the lateral wall of base.

Preferably, in the fluid sensing device, the third portion is composed of two sections of rod bodies, a cylindrical connecting portion protrudes from the middle of one of the two sections of rod bodies, a circular duct is concavely arranged in the middle of the other section of the two sections of rod bodies, the connecting portion is inserted into the circular duct, and the connecting portion is in threaded connection with the inner side wall of the circular duct formed on the piston core rod;

The fluid sensing apparatus further comprises:

the vertical rod is fixedly arranged on the side wall of the fourth part and is parallel to the axis of the fourth part, and when the notch is tightened, the vertical rod can pass through the second through hole;

The support rod is arranged in the downstream end of the pipe body in the fluid flowing direction, is fixedly connected with the inner side wall of the pipe body, is provided with a third through hole, and penetrates through the third through hole, and when the fourth part is placed on the support rod, the first opening is all located in the base.

The invention at least comprises the following beneficial effects:

1. Fewer parts and easier production.

2. The magnet is embedded in the piston core rod, so that the space is saved.

3. The magnet is sealed in the piston core rod, so that the problems of authentication and cost caused by magnet water passing are solved.

4. The difference in determination due to the small flow rate of the fluid can be reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural view of a piston rod according to one embodiment of the present invention;

FIG. 2 is a schematic structural view of a base according to one embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is a cross-sectional view taken along line B-B in FIG. 2;

FIG. 5 is a schematic view of the structure of a tube according to one embodiment of the invention without fluid passing through the tube;

FIG. 6 is a schematic view of a structure in which a fluid is passed through a tube according to one embodiment of the invention;

FIG. 7 is a schematic diagram of the structure of a third portion according to one embodiment of the invention;

FIG. 8 is a schematic view of the structure of a support block and a connecting rod according to one embodiment of the invention;

FIG. 9 is a schematic view of a structure of a support block according to an embodiment of the present invention;

Fig. 10 is a schematic structural view of a support bar according to an embodiment of the present invention.

Detailed Description

The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.

It should be noted that, in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 1 to 10, the present invention provides a fluid sensing apparatus provided in a flow path through which a fluid flows, comprising:

a base 100 fixed in the flow path;

A plunger rod 110 provided in the base 100 or provided on the base 100 and connected to the base 100 via an elastic member 120, the plunger rod 110 being provided with a pushing surface for pushing fluid in a flow path; the elastic member 120 may be a spring plate, a rib, a spring, etc., preferably a spring, with low cost and easy control of elastic deformation.

The magnet 130 is arranged on the piston core bar 110, the magnet 130 can be a soft magnet or a permanent magnet, preferably a permanent magnet, and the magnetism of the magnet is stable and is not easy to demagnetize; and

A magnetic induction device 190 or a magnetic probe disposed at a side surface or around the plunger rod 110 to induce a magnetic force line or a magnetic field intensity variation value received as the position of the magnet 130 is varied, thereby determining whether a fluid flows through the flow path;

wherein the elastic member 120 is disposed such that a restoring force thereof has a direction opposite to a fluid flowing direction in the flow path.

In the fluid sensing device provided by the present disclosure, when fluid, such as water flow or air flow, in the flow path, the plunger rod 110 is pushed to move, the plunger rod 110 drives the magnet 130 thereon to move, and the magnetic induction device 190 can sense the change of the magnetic field intensity, so as to determine that the fluid flows through the flow path. When no fluid passes through the flow path, the elastic member 120 returns to the original position, and returns the plunger rod 110 to the position before the fluid passes through.

The present embodiment uses the displacement change of the magnet 130 and detects the change of the magnetic field intensity by the magnetic probe or the magnetic induction device 190 to determine whether the fluid passes through the flow path. The magnetic induction device 190 is in this embodiment disposed directly within the flow path through which the fluid flows.

In a preferred embodiment, the fluid sensing apparatus further comprises:

The pipe body 140 is fixed on the flow path or in the flow path along the flow direction of the fluid in the flow path, a channel for the fluid in the flow path to flow is arranged in the pipe body 140, the base 100 and the piston core rod 110 are both positioned in the pipe body 140, the base 100 is fixed on the pipe body 140 and is fixed in the flow path through the pipe body 140, and the magnetic induction device 190 is arranged on the outer wall of the pipe body 140.

In the above-described embodiments, the fluid sensing apparatus is positioned in the flow path through which the fluid flows by fixing the plunger rod 110 to the base 100, fixing the base 100 to the tube body 140, and fixing the tube body 140 to the flow path or the flow path.

In a preferred embodiment, in the fluid sensing apparatus, the base 100 is hollow, and the interior thereof is in communication with the downstream end of the tube 140 in the fluid flow direction therein, so that the fluid entering the base 100 can flow to the downstream end of the tube 140 in the fluid flow direction therein and out through the downstream end of the tube 140 in the fluid flow direction therein, the base 100 is provided with a first through hole 101, the elastic member 120 is located inside the base 100, the elastic member 120 is configured to be compressed in the fluid flow direction inside the tube 140, the plunger 110 is disposed in the fluid flow direction inside the tube 140, and the upstream end thereof in the fluid flow direction inside the tube 140 passes through the first through hole 101 and is located outside the base 100, the downstream end of the plunger 110 in the fluid flow direction inside the tube 140 is connected to the base 100 through the elastic member 120, the pushing surface is located on the plunger 110 in the upstream end of the fluid flow direction inside the tube 140, the plunger 110 can flow through the first through hole 101 and the second through hole 111 in the fluid flow direction inside the tube 140, and the plunger 110 can flow through the first through hole 112, and the second through hole 101 can flow in the first through hole 101. The first through hole 101 enables the upstream end of the tube body 140 in the fluid flow direction therein to communicate with the interior of the base 100, and thus the pressure in the tube body 140 is uniform throughout when no fluid passes through the flow path because the interior of the base 100 communicates with the downstream end of the tube body 140 in the fluid flow direction therein, and the upstream end of the tube body 140 in the fluid flow direction therein communicates with the downstream end of the tube body 140 in the fluid flow direction therein.

In the above-mentioned scheme, when fluid passes through the tube 140, the fluid pushes the plunger rod 110 to move and drives the magnet 130 thereon to move, and the magnetic induction device 190 can induce the change of the magnetic field intensity, thereby determining that the fluid flows through the flow path. When the plunger rod 110 moves along the direction of fluid flow in the tube 140, the elastic member 120 is compressed, and at the same time the second portion 112 passes through the first through hole 101 and enters the base 100, and when no fluid enters the tube 140, the elastic member 120 returns and pushes the second portion 112 to the outside of the base 100, and the first through hole 101 can play a guiding role during the movement of the second portion 112. Because the first portion 111 cannot pass through the first through hole 101, when the fluid flow rate in the tube 140 is large, the first portion 111 will abut against the base 100, so that the elastic member 120 can be prevented from being excessively compressed.

In a preferred embodiment, as shown in fig. 1, the first portion 111 and the second portion 112 are coaxially disposed in a cylindrical shape, the first portion 111 is in clearance fit with the tube 140, the first portion 111 and the second portion 112 are hollow, and are in communication with each other, at least one first opening 113 is disposed on a bottom surface of the first portion 111 away from the second portion 112, each first opening 113 is in communication with the interior of the first portion 111, at least one second opening 114 is disposed on a sidewall of the second portion 112, each second opening 114 is in communication with the interior of the second portion 112, and the second openings 114 are configured to: when the first portion 111 moves in the fluid flow direction in the tube 140 to abut against the base 100, the second opening 114 is entirely located in the base 100, and the interior of the second portion 112 communicates with the interior of the base 100 through the second opening 114.

In the above-described aspect, when the fluid in the tube body 140 flows, the pressure in the upstream end of the tube body 140 in the fluid flow direction therein increases and is greater than the pressure in the base 100, and the pressure in the downstream end of the tube body 140 in the fluid flow direction therein, the first through-hole 101 does not transmit the pressure in the upstream end of the tube body 140 in the fluid flow direction therein into the base 100 and the downstream end of the tube body 140 in the fluid flow direction therein, and thus a pressure difference is generated, when the pressure difference is greater than the elastic force of the elastic member 120, the fluid pushes the piston rod 110 to move so that the second portion 112 passes through the first through-hole 101 while the fluid enters the first portion 111 and the second portion 112 through the first opening 113, and when the second opening 114 enters the base 100, the inside of the second portion 112 communicates with the inside of the base 100 through the second opening 114, and the fluid in the first portion 111 and the second portion 112 enters the inside of the base 100 through the second opening 114, and the inside of the base 100 communicates with the fluid in the downstream end of the tube body 140 in the fluid flow direction therein through the downstream end of the tube body 140, and the inside the base 100. When the fluid in the pipe body 140 flows, the fluid pushes the piston core rod 110 to move and drives the magnet 130 on the piston core rod to move, and the magnetic induction device 190 can induce the change of the magnetic field intensity, so that the fluid in the flow path is determined to flow. When no fluid enters the tube 140, the upstream end of the tube 140 in the fluid flow direction therein communicates with the downstream end of the tube 140 in the fluid flow direction therein, the pressure is uniform throughout the tube 140, and the elastic member 120 stretches and pushes the second portion 112 to the outside of the base 100.

In a preferred embodiment, in the fluid sensing apparatus, the base 100 is provided with a second through hole 102, the downstream end of the plunger rod 110 along the fluid flow direction in the tube 140 passes through the second through hole 102, and the downstream end of the plunger rod 110 along the fluid flow direction in the tube 140 is composed of a third portion 115 and a fourth portion 116, the third portion 115 is located in the base 100, and the cross section thereof is smaller than the cross section of the second portion 112, the fourth portion 116 passes through the second through hole 102 and is located outside the base 100, and the second through hole 102 is configured to: when the plunger rod 110 moves along the fluid flow direction in the tube 140, the second through hole 102 is in clearance fit with the third portion 115, the elastic component 120 is a spring, the plunger rod 110 is connected with the base 100 through the third portion 115 in the base 100 through the spring, the spring is sleeved on the third portion 115, and two ends of the spring respectively abut against the base 100 and the second portion 112.

In the above-mentioned scheme, when the fluid in the pipe body 140 flows, the fluid pushes the plunger rod 110 to move and drives the magnet 130 thereon to move, and the magnetic induction device 190 can induce the change of the magnetic field intensity, thereby determining that the fluid flows in the flow path. When the plunger rod 110 moves in the direction of fluid flow within the tube 140, the spring is compressed, and the second portion 112 passes through the first through-hole 101 and into the base 100, and the third portion 115 passes through the second through-hole 102 and protrudes out of the base 100. When no fluid enters the tube 140, the elastic member 120 returns and pushes the second portion 112 to the outside of the base 100, the third portion 115 is pulled back to the inside of the base 100, and the first through hole 101 and the second through hole 102 can respectively play a guiding role during the movement of the second portion 112 and the third portion 115. The first through hole 101 and the second through hole 102 can make the pressure uniform throughout the tube 140 when no fluid passes through the tube 140.

In a preferred embodiment, as shown in fig. 1, the third portion 115 is cylindrical, the fourth portion 116 gradually increases toward the third portion 115 to have the same diameter as the third portion 115, that is, the fourth portion 116 is conical, and the third portion 115 and the fourth portion 116 are coaxially disposed with the second portion 112, respectively.

In the above-described aspect, the fourth portion 116 can be sequentially passed through the first through-hole 101, the inside of the base 100, and the second through-hole 102 when the fluid sensing device is assembled.

In a preferred embodiment, in the fluid sensing apparatus, as shown in fig. 1, a protrusion 117 is provided on a sidewall of the fourth portion 116, and the protrusion 117 is configured to: when no fluid enters the pipe body 140 or the third portion 115 is located in the base 100, the protrusion 117 abuts against the base 100, the fourth portion 116 is provided with a notch 118, the notch 118 is disposed along the axial direction of the fourth portion 116, and extends into the third portion 115 through the fourth portion 116, and the notch 118 is disposed as follows: when the notch 118 is tightened, both the fourth portion 116 and the projection 117 can pass through the second through hole 102.

In the above-mentioned scheme, when no fluid enters the pipe body 140 or after the spring returns, the protrusion 117 is abutted against the base 100, so that the piston rod 110 is prevented from being pushed to the outside of the base 100 due to the large elastic force of the spring during the return. When the fluid sensing apparatus is assembled, after the fourth portion 116 passes through the first through hole 101 and the second through hole 102 in sequence, the fourth portion 116 is pinched to tighten the notch 118, and the protrusion 117 can pass through the second through hole 102 and abut against the base 100.

In a preferred embodiment, in the fluid sensing apparatus, the base 100 has two parallel bottom surfaces, the base 100 is in seamless connection or clearance fit with the inner wall of the tube 140 through the side wall of the base 100, the first through hole 101 and the second through hole 102 are respectively located on the two bottom surfaces of the base 100, at least one third opening 103 is located on the bottom surface of the base 100 where the second through hole 102 is located, and the interior of the base 100 is further communicated with the downstream end of the tube 140 along the fluid flowing direction therein through the third opening 103 in addition to the second through hole 102.

In the above-described aspect, since the base 100 is seamlessly coupled or clearance-fitted with the inner wall of the tube body 140 through the side wall thereof, the pushing force of the fluid in the upstream end of the tube body 140 in the fluid flow direction therein on the plunger rod 110 is large when the fluid flows, and the plunger rod 110 can be easily moved even if the fluid flow rate is small.

In a preferred embodiment, in the fluid sensing apparatus, the base 100 is fixed to the pipe body 140 in the following manner:

The upstream end and the downstream end of the tube body 140 along the fluid flow direction inside the tube body are hollow cylinders, and are coaxially arranged, the inner diameter of the upstream end of the tube body 140 along the fluid flow direction inside the tube body is larger than the inner diameter of the downstream end of the tube body, the base 100 is clamped in the upstream end of the tube body 140 along the fluid flow direction and is in seamless connection with the upstream end of the tube body 140 along the fluid flow direction, the bottom surface of the base 100 provided with the second through hole 102 is placed on the downstream end of the tube body 140 along the fluid flow direction, and the downstream end of the tube body 140 along the fluid flow direction does not seal the third opening 103.

In the above-described aspect, the base 100 is placed on the pipe body 140 at the downstream end in the fluid flow direction, so that the base 100 cannot move along the fluid when the fluid in the pipe body 140 flows, and the base 100 can be easily inserted into the pipe body 140 from the upstream end of the pipe body 140 in the fluid flow direction therein.

In a preferred embodiment, the number of the second openings 114 and the number of the third openings 103 are equal, and the second openings 114 are arranged at intervals along the circumferential direction of the second portion 112, and when the second openings 114 are located in the base 100, the second openings 114 are opposite to the third openings 103 one by one.

In the above-mentioned scheme, when fluid flows in the pipe body 140, the fluid can push the piston rod 110 to move, so that the second opening 114 enters the base 100, the upstream end of the pipe body 140 along the fluid flow direction therein is communicated with the interior of the base 100, and the fluid flowing into the interior of the base 100 flows out through each third opening 103. Because the second openings 114 are opposite to the third openings 103, the fluid flowing out of the second openings 114 can quickly flow out of the base 100 through the third openings 103.

In a preferred embodiment, as shown in fig. 2 and 5, in the fluid sensing device, the base 100 is formed by an integrally formed upper portion and a lower portion, the upper portion and the lower portion of the base 100 are hollow cylinders, and are mutually communicated and coaxially disposed with the tube 140, the first through hole 101 is disposed on a bottom surface of the upper portion of the base 100, the second through hole 102 is disposed on a bottom surface of the lower portion of the base 100, the outer diameters of the second portion 112 and the third portion 115 are smaller than the inner diameters of the upper portion and the lower portion of the base 100, the outer sidewall of the lower portion of the base 100 is not in contact with the inner sidewall of the tube 140, the inner diameter of the downstream end of the tube 140 in the fluid flow direction is smaller than the outer diameter of the lower portion of the base 100, and is larger than the inner diameter of the lower portion of the base 100, so that the lower portion of the tube 140 can rest on the downstream end of the tube 140 in the fluid flow direction, a plurality of fourth openings 104 are disposed on the sidewall of the lower portion of the base 100 along the circumferential direction at intervals, the fourth openings 103 are disposed along the circumferential direction, the number of the fourth openings 103 are equal to the third openings 104, the fourth openings 103 are disposed along the fourth openings and the fourth openings are disposed along the edges, and the fourth openings are correspondingly disposed along the fourth openings and the third openings 104: when the second openings 114 are located in the base 100, the second openings 114 are opposite to the fourth openings 104 one by one, and the base 100 is seamlessly connected with the upstream end of the pipe body 140 located in the fluid flow direction through the upper portion, for example, an annular groove is provided on the upper portion of the base 100, the opening of the groove faces the inner wall of the pipe body, and an annular sealing ring is provided in the groove, so that the upper portion of the base 100 is seamlessly connected with the pipe body 140 through the sealing ring.

In the above-mentioned scheme, when there is fluid flowing in the tube body 140, the fluid can push the piston rod 10 to move, so that the second opening 114 enters the base 100, the upstream end of the tube body 140 along the fluid flowing direction therein is communicated with the interior of the base 100 through the second opening 114, and the fluid flowing into the interior of the base 100 can directly flow out through each third opening 103 or flow out through the fourth opening 104 and then flow out through the third opening 103. The fourth opening 104 can reduce the weight of the base 100 and reduce the processing cost of the base 100.

In one preferred embodiment, the magnet 130 is embedded and sealed on the plunger rod 110 in the fluid sensing apparatus.

In the above scheme, the magnet 130 is embedded and sealed on the plunger rod 110, so that space is saved, and direct contact between the magnet 130 and fluid is avoided, thereby solving the problems of authentication and cost caused by water passing of the magnet 130.

In a preferred embodiment, in the fluid sensing apparatus, the second opening 114 is elongated and penetrates through the sidewall of the second portion 112 along the length or axis direction of the second portion 112, and when no fluid is flowing into the pipe 140, the bottom of the second portion 112 is located in the first through hole 101.

In the above-described aspect, when the flow rate of the fluid in the tube body 140 is small, the pressure in the upstream end of the tube body 140 in the fluid flow direction therein increases and is greater than the pressure in the base 100 and in the downstream end of the tube body 140 in the fluid flow direction therein, the first through-hole 101 does not transmit the pressure in the upstream end of the tube body 140 in the fluid flow direction therein into the base 100 and in the downstream end of the tube body 140 in the fluid flow direction therein, and thus a pressure difference is generated, and when the pressure difference is greater than the elastic force of the elastic member 120, the fluid pushes the piston rod 110 to move, the second portion 112 passes through the first through-hole 101, and the second opening 114 is more likely to enter the base 100 because the second opening 114 is close to the first through-hole 101. Thus, when the fluid flow rate is small, the plunger rod 110 can also move, and the fluid can smoothly flow in the tube body 140.

In a preferred embodiment, as shown in fig. 2 and 4, the base 100 is provided with a pressure relief hole 105 or a pressure relief groove, and the pressure relief hole 105 or the pressure relief groove is respectively connected to the upstream end of the pipe 140 in the fluid flow direction therein and the interior of the base 100.

In the above-described aspect, when the gap between the second portion 112 and the first through hole 101 is small, the upstream end of the tube body 140 in the fluid flow direction therein and the inside of the base 100 may be further communicated through the pressure release hole 105. When the spring returns, the fluid in the upstream end of the tube 140 along the fluid flow direction therein can flow into the base 100 through the pressure relief hole 105, and then flow out through the downstream end of the tube 140 along the fluid flow direction therein.

In a preferred embodiment, as shown in fig. 8 and 9, the base 100 is fixed to the pipe 140 in the following manner:

The pipe body 140 and the base 100 are hollow cylinders, and are coaxially arranged, a gap is formed between the outer side wall of the base 100 and the inner side wall of the pipe body 140, a plurality of supporting blocks 150 are arranged on the inner side wall of the pipe body 140 along the circumferential direction at intervals, the bottom surface of the base 100 provided with the second through holes 102 is placed on the plurality of supporting blocks 150, the third opening 103 is not sealed by the supporting blocks 150, a plurality of connecting rods 160 are arranged between the inner side wall of the pipe body 140 and the outer side wall of the base 100 along the circumferential direction of the base 100 at intervals, one end of each connecting rod 160 is fixedly connected with the inner side wall of the pipe body 140, and the other end of each connecting rod 160 abuts against the outer side wall of the base 100.

In the above-described scheme, the base 100 is placed on the plurality of support blocks 150 such that the base 100 is easily inserted and fixed in the pipe body 140. Because there is a gap between the outer sidewall of the base 100 and the inner sidewall of the tube 140, when no fluid enters the tube 140, the upstream end of the tube 140 along the fluid flow direction therein can be communicated with the downstream end of the tube 140 along the fluid flow direction therein, and when there is fluid circulation in the tube 140, only a small amount of fluid can flow directly through the gap between the outer sidewall of the base 100 and the inner sidewall of the tube 140, so that the piston core rod 110 can also move when the fluid flow rate is small.

In a preferred embodiment, as shown in fig. 7, the third portion 115 is formed by two cylindrical rod bodies, wherein a cylindrical connecting portion 119 protrudes from the middle of one of the two rod bodies, a circular hole is concavely formed in the middle of the other rod body, the connecting portion 119 is inserted into the circular hole, an external thread is formed on the connecting portion 119, an internal thread is formed on an inner side wall of the circular hole formed on the piston rod 110, and the connecting portion 119 is in threaded connection with the inner side wall of the circular hole formed on the piston rod 110;

as shown in fig. 6 and 10, the fluid sensing apparatus further includes:

a vertical rod 170, which is fixed on the side wall of the fourth portion 116 and is parallel to the axis of the fourth portion 116, when the notch 118 is tightened, the vertical rod 170 can pass through the second through hole 102;

The supporting rod 180 is disposed on the pipe body 140 at the downstream end along the fluid flowing direction, and is fixedly connected with the inner side wall of the pipe body 140, the supporting rod 180 is provided with a third through hole 181, the vertical rod 170 passes through the third through hole 181, and when the fourth part 116 is placed on the supporting rod 180, the first opening 113 is all located in the base 100.

In the above-described aspect, the two ends of the tube body 140 are respectively provided with the fluid inlet and the fluid outlet, the fluid inlet communicates with the upstream end of the tube body 140 in the fluid flow direction therein, and the fluid outlet communicates with the downstream end of the tube body 140 in the fluid flow direction therein. Because the first portion 111 cannot pass through the first through-hole 101, the plunger rod 110 can only be removed from the upstream end of the tube body 140 in the direction of fluid flow therein. When the spring has a long service life and needs to be replaced, the first part 111 is rotated to separate the two sections of rods, then the first part 111, the second part 112 and the rod connected with the second part 112 are taken out from the upstream end of the pipe body 140 along the fluid flow direction in the pipe body, then the spring is taken out, a new spring is sleeved on the rod connected with the fourth part 116, then the rod connected with the second part 112 is inserted into the base 100, the spring is sleeved on the rod connected with the second part 112, and finally the first part 111 is rotated to fix the two sections of rods together. This avoids the problem of simultaneously removing the base 100 and the plunger rod 110 and then securing the base 100 within the tube 140. When the spring is replaced, the plunger rod 110 is disposed in the vertical direction. When the two sections of rods are separated, the rod body connected with the fourth portion 116 will rest on the supporting rod 180, and since the vertical rod 170 is always inserted into the third through hole 181, the third through hole 181 can also play a guiding role, and when the two sections of rods are separated, the third through hole can limit the rotation of the rod body connected with the fourth portion 116. After the spring is replaced and the two sections of rods are fixed together, the plunger rod 110 moves upwards under the elastic force of the spring until the protrusion 117 abuts against the base 100.

Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims

1. A fluid sensing apparatus provided in a flow path through which a fluid flows, comprising:

a base fixed in the flow path;

The magnet is embedded and sealed on the piston core rod;

the pipe body is fixed on the flow path along the flow direction of the fluid in the flow path, a channel for the fluid in the flow path to flow through is arranged in the pipe body, the base and the piston core rod are both positioned in the pipe body, the base is fixed on the pipe body and is fixed in the flow path through the pipe body, and the magnetic induction device is arranged on the outer wall of the pipe body;

wherein the elastic member is arranged such that a direction of a restoring force thereof is opposite to a fluid flow direction in the flow path;

The inner part of the base is hollow, the inner part of the base is communicated with the downstream end of the tube body in the fluid flow direction in the tube body, a first through hole is formed in the base, an elastic part is arranged in the base, the elastic part is compressed in the fluid flow direction in the tube body, a piston core rod is arranged in the fluid flow direction in the tube body, the upper end of the piston core rod in the fluid flow direction in the tube body passes through the first through hole and is positioned outside the base, the piston core rod is connected with the base through the elastic part at the inner part of the base through the upper end of the piston core rod in the fluid flow direction in the tube body, the pushing surface is positioned at the upper end of the piston core rod in the fluid flow direction in the tube body, the upper end of the piston core rod in the fluid flow direction in the tube body is composed of a first part and a second part, the second part can pass through the first through hole in the fluid flow direction in the tube body and is in clearance fit with the first through hole, and the first part cannot pass through the first through hole;

The utility model discloses a novel pipe fitting structure, including first part, second part, first part and pipe body clearance fit, first part and second part are all inside cavity, and communicate each other, are provided with at least one first opening on the bottom surface that keeps away from the second part on the first part, every first opening all communicates with the inside of first part, are provided with at least one second opening on the lateral wall of second part, every second opening all communicates with the inside of second part, the second opening sets up: when the first part moves along the fluid flowing direction in the pipe body to be propped against the base, the second opening is all positioned in the base, and the interior of the second part is communicated with the interior of the base through the second opening;

The base is provided with a second through hole, the downstream end of the piston core rod along the fluid flow direction in the pipe body passes through the second through hole and consists of a third part and a fourth part, the third part is positioned in the base, the size of the cross section of the third part is smaller than that of the cross section of the second part, the fourth part passes through the second through hole and is positioned outside the base, and the second through hole is formed by the following steps: when the piston core rod moves along the fluid flow direction in the pipe body, the second through hole is in clearance fit with the third part, the elastic part is a spring, the piston core rod is connected with the base through the spring in the base through the third part, the spring is sleeved on the third part, and two ends of the spring are respectively propped against the base and the second part;

The third part is cylindrical, the diameter of the fourth part gradually increases towards the third part to be equal to the diameter of the third part, and the third part and the fourth part are respectively coaxially arranged with the second part;

The side wall of the fourth part is provided with a bulge, and the bulge is set as follows: when the third part is located the base, protruding and base offset, be provided with the breach on the fourth part, the breach sets up along the axis direction of fourth part, and runs through the fourth part and extend to in the third part, the breach sets up to: when the notch is tightened, the fourth part and the bulge can pass through the second through hole;

The third part consists of two sections of rod bodies, wherein the middle part of one of the two sections of rod bodies is protruded with a cylindrical connecting part, the middle part of the other one of the two sections of rod bodies is concavely provided with a circular pore canal, the connecting part is inserted in the circular pore canal, and the connecting part is in threaded connection with the inner side wall of the circular pore canal formed on the piston core rod;

The fluid sensing apparatus further comprises:

2. The fluid sensing apparatus of claim 1, wherein the base has two bottom surfaces parallel to each other, the base is in seamless connection or clearance fit with the inner wall of the tube body through the side wall thereof, the first through hole and the second through hole are respectively located on the two bottom surfaces of the base, at least one third opening is provided on the bottom surface of the base provided with the second through hole, and the interior of the base is communicated with the downstream end of the tube body along the fluid flowing direction therein through the third opening.

3. The fluid sensing apparatus of claim 2, wherein the base is fixed to the tube body in a specific manner of:

4. A fluid sensing apparatus according to claim 3, wherein the second openings and the third openings are equal in number and are each plural, and the plural second openings are disposed at intervals along the circumferential direction of the second portion, and when the second openings are located in the base, the second openings are in one-to-one correspondence with the third openings.

5. A fluid sensing apparatus according to claim 3, wherein the base is formed of integrally formed upper and lower portions, the upper and lower portions of the base are each formed in a cylindrical shape having a hollow interior and are communicated with each other and are coaxially disposed with the tube body, the first through-hole is disposed on one bottom surface of the upper portion of the base, the second through-hole is disposed on one bottom surface of the lower portion of the base, the outer diameters of the second and third portions are smaller than the inner diameters of the upper and lower portions of the base, the outer sidewall of the lower portion of the base is not in contact with the inner sidewall of the tube body, the inner diameter of the tube body at the downstream end in the fluid flow direction is smaller than the outer diameter of the lower portion of the base and is larger than the inner diameter of the lower portion of the base, a plurality of fourth openings are disposed on the sidewall of the lower portion of the base at intervals in the circumferential direction thereof, the fourth openings are equal in number to and in one-to-one correspondence with the third openings are disposed at intervals along the edge of one bottom surface of the lower portion of the base, the fourth openings penetrate the sidewall of the lower portion of the base and are disposed as a plurality of fourth openings are disposed in correspondence with the fourth openings. When the second openings are positioned in the base, the second openings are opposite to the fourth openings one by one, and the base is in seamless connection with the upstream end, positioned in the fluid flow direction, of the pipe body through the upper part of the base.

6. The fluid sensing apparatus of claim 4, wherein the second opening is elongated and extends through a sidewall of the second portion along a length of the second portion.

7. The fluid sensing apparatus of claim 1, wherein the base is provided with a pressure relief hole in communication with an upstream end of the tube body in a fluid flow direction therein and an interior of the base, respectively.

8. The fluid sensing apparatus of claim 2, wherein the base is fixed to the tube body in a specific manner of: