阅读说明：本技术 具有自动排气功能的液压式静力水准仪及其调平衡方法 (Hydraulic static level gauge with automatic exhaust function and balance adjusting method thereof ) 是由 童志峰 徐艳召 徐建 杨振 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种具有自动排气功能的液压式静力水准仪,包括：静力水准仪壳体,所述静力水准仪壳体的内部设有横向液腔管路和与所述横向液腔管路连通的纵向液腔管路,所述纵向液腔管路的上端为排气口,所述静力水准仪壳体的上部设有凹陷而成的与所述排气口连通的排气阀收容腔；所述具有自动排气功能的液压式静力水准仪还包括部分收容于所述排气阀收容腔内的自动排气阀,所述自动排气阀包括：阀壳、排气法兰、弹性伸缩件和阀塞。本发明还公开了一种具有自动排气功能的液压式静力水准仪的调平衡方法。本发明旨在解决现有技术中的静力水准仪在服役过程中产生气泡不能及时排出,导致测量压强不准,进而影响沉降测量精度的技术问题。(The invention discloses a hydraulic static level with an automatic exhaust function, which comprises: the static level comprises a static level shell, wherein a transverse liquid cavity pipeline and a longitudinal liquid cavity pipeline communicated with the transverse liquid cavity pipeline are arranged inside the static level shell, an air outlet is formed in the upper end of the longitudinal liquid cavity pipeline, and an exhaust valve accommodating cavity which is formed by sinking and communicated with the air outlet is formed in the upper part of the static level shell; the hydraulic static level with the automatic air exhaust function further comprises an automatic air exhaust valve which is partially contained in the air exhaust valve containing cavity, and the automatic air exhaust valve comprises: valve casing, exhaust flange, elastic expansion piece and valve plug. The invention also discloses a balance adjusting method of the hydraulic static level gauge with the automatic exhaust function. The invention aims to solve the technical problem that the measuring pressure is inaccurate and the settlement measuring precision is influenced because bubbles generated in the service process of the static level gauge in the prior art cannot be discharged in time.)

1. The utility model provides a fluid pressure type hydrostatic level with automatic exhaust function which characterized in that includes: the static level comprises a static level shell, wherein a transverse liquid cavity pipeline and a longitudinal liquid cavity pipeline communicated with the transverse liquid cavity pipeline are arranged inside the static level shell, an air outlet is formed in the upper end of the longitudinal liquid cavity pipeline, and an exhaust valve accommodating cavity which is formed by sinking and communicated with the air outlet is formed in the upper part of the static level shell; the hydraulic static level with the automatic air exhaust function further comprises an automatic air exhaust valve which is partially contained in the air exhaust valve containing cavity, and the automatic air exhaust valve comprises: the exhaust flange, the elastic expansion piece and the valve plug are sequentially arranged between the bottom of the valve casing and the bottom of the exhaust valve accommodating cavity; be equipped with the first exhaust through-hole with the exterior space intercommunication on the valve casing, be equipped with the intercommunication on the exhaust flange the second exhaust through-hole of first exhaust through-hole and exhaust chamber.

2. The hydraulic static level with automatic air discharge function as claimed in claim 1, wherein a sealing ring is provided between the valve plug and the bottom of the air discharge valve accommodating cavity, and the elastic expansion member is a pressure spring.

3. The hydraulic static level with automatic air bleeding according to claim 2, wherein the automatic air bleeding valve further comprises a pressure adjusting screw connected to the air bleeding flange and used for adjusting the compression amount of the pressure applying spring.

4. The hydraulic static level with automatic air exhaust function as claimed in claim 3, wherein the bottom of the pressure adjusting screw is connected with the air exhaust flange in a threaded manner, and the top of the pressure adjusting screw is fixedly provided with a locking wheel for adjusting the lifting of the adjusting screw.

5. The hydraulic static level with automatic air exhaust function as claimed in claim 4, wherein the pressure adjusting screw is provided with a pressure display scale, the extending direction of the pressure display scale is consistent with the lifting direction of the pressure adjusting screw, and the valve housing is provided with a scale pointer facing the pressure display scale.

6. The hydraulic static level with automatic air exhaust function as claimed in claim 5, wherein the valve housing is provided with a mounting hole penetrating therethrough, the bottom section of the pressure adjusting screw is provided with an external thread of the pressure adjusting screw, the bottom section of the mounting hole is provided with an internal thread of the valve housing matching with the external thread of the pressure adjusting screw, the bottom end of the pressure adjusting screw is provided with a screwing hole formed by a recess, and the air exhaust flange comprises a screwing projection extending into the screwing hole and connected with the screwing hole in a threaded manner.

7. The hydraulic static level with automatic air discharge function as claimed in claim 6, wherein said air discharge valve accommodating chamber is provided with a level housing internal thread on an inner wall thereof, and said valve housing is externally provided with a valve housing external thread engaged with said level housing internal thread, whereby said level housing is detachably attached to said valve housing by engagement of said level housing internal thread with said valve housing external thread.

8. The hydraulic static level with automatic air discharge function of claim 7, wherein the top end of the valve housing is provided with four square grooves, and the four square grooves are oppositely arranged in a group two by two.

9. The hydraulic static level with the automatic exhaust function as claimed in claim 8, wherein a shell inner cavity is formed in the shell of the static level, a partition plate is arranged in the shell inner cavity, the partition plate divides the shell inner cavity into a static level liquid cavity and a static level air cavity which are arranged along the front and back directions of the shell of the static level, a stepped hole is formed in the center of the partition plate, and a pressure core body is assembled at the stepped hole; the left end face and the right end face of the static level shell are respectively provided with two air pipe joints communicated with the air cavity; the hydraulic static level with the automatic exhaust function further comprises an RS485 communication line joint communicated with the air cavity.

10. A balance adjusting method of a hydraulic static level gauge with an automatic exhaust function is characterized by comprising the following steps:

the first step is as follows: taking a liquid storage pipe filled with antifreeze and two sets of hydraulic static levels with automatic air exhaust function as claimed in any one of claims 3 to 9, connecting a plurality of hydraulic static levels with automatic air exhaust function with a liquid storage tank through an air pipe, a liquid pipe and an RS485 communication cable, installing an automatic air exhaust valve in the hydraulic static levels with automatic air exhaust function, and then injecting liquid into the hydraulic static levels with automatic air exhaust function through the liquid storage tank through the liquid pipe;

the second step is that: then according to the relative height of the static level gauge and the liquid storage tank, the theoretical pressure P is calculated by the following formula,

P＝p_{anti-freezing fluid}gh, wherein:

p_{anti-freezing fluid}: the density of the anti-freezing solution is,

g: the acceleration of the gravity is carried out,

h: the height difference between the antifreeze in the liquid storage tank and the antifreeze in the static level gauge,

the pressing spring critical pressure F is then calculated according to the following formula,

F＝P*S_{exhaust port}Wherein:

S_{exhaust port}: area of exhaust port

Then the compression amount X of the pressure spring is calculated,

X＝F/K_{spring rate}，

K_{Spring rate}: spring rate

The third step: adjusting screw for adjusting pressure

And rotating the pressure adjusting screw rod to enable the pressure adjusting screw rod to descend by a distance equal to the compression amount X of the pressure applying spring, wherein the valve plug is in a static balance state and completely closes the exhaust port.

Technical Field

The invention belongs to the technical field of hydraulic detection, and particularly relates to a hydraulic static level gauge with an automatic exhaust function and a balance adjusting method thereof.

Background

A hydrostatic level is a high precision level measurement system that is suitable for measuring relative settlement at multiple points. In use, the containers of the plurality of hydrostatic levels are connected by a liquid pipe, the liquid level of each container is measured by the related sensor, and the liquid level variation of each measuring point can be measured.

The static level in the prior art does not have an automatic exhaust function, and when the static level is installed on a construction site (a house, a subway or a bridge site), a large amount of bubbles are generated in anti-freezing liquid in the static level due to the environmental influence of the construction site or the nonstandard installation liquid injection operation. Because the prior static level gauge does not have the function of automatic exhaust, the manual operation is needed, and the exhaust is carried out through an exhaust screw or a manual exhaust valve.

The defects of the prior art are that the pressure sensed by the pressure core inside the hydrostatic level has errors due to the fact that the air cannot be exhausted in time or in real time, so that the settlement measurement precision of the hydrostatic level is reduced, monitoring safety judgment decision is influenced, and real-time safety early warning cannot be accurately carried out on safety monitoring of a building.

Disclosure of Invention

Technical problem to be solved

Based on the technical scheme, the invention provides a hydraulic static level with an automatic exhaust function and a balance adjusting method thereof, and aims to solve the technical problem that the static level in the prior art cannot discharge bubbles in time in the service process, so that the measured pressure is inaccurate, and the settlement measurement precision is influenced.

(II) technical scheme

In order to solve the technical problem, the invention provides a hydraulic static level with an automatic exhaust function, which comprises: the static level comprises a static level shell, wherein a transverse liquid cavity pipeline and a longitudinal liquid cavity pipeline communicated with the transverse liquid cavity pipeline are arranged inside the static level shell, an air outlet is formed in the upper end of the longitudinal liquid cavity pipeline, and an exhaust valve accommodating cavity which is formed by sinking and communicated with the air outlet is formed in the upper part of the static level shell; the hydraulic static level with the automatic air exhaust function further comprises an automatic air exhaust valve which is partially contained in the air exhaust valve containing cavity, and the automatic air exhaust valve comprises: the exhaust flange, the elastic expansion piece and the valve plug are sequentially arranged between the bottom of the valve casing and the bottom of the exhaust valve accommodating cavity; be equipped with the first exhaust through-hole with the exterior space intercommunication on the valve casing, be equipped with the intercommunication on the exhaust flange the second exhaust through-hole of first exhaust through-hole and exhaust chamber.

Preferably, the valve plug with be equipped with the sealing washer between the discharge valve accepts the chamber bottom, the elastic expansion piece is pressure spring.

Preferably, the automatic exhaust valve further comprises a pressure adjusting screw connected to the exhaust flange and used for adjusting the compression amount of the pressure spring.

Preferably, the bottom of the pressure adjusting screw is in threaded connection with the exhaust flange, and a locking wheel for adjusting the lifting of the adjusting screw is fixedly arranged at the top of the pressure adjusting screw.

Preferably, be equipped with the pressure display scale on the pressure adjusting screw, the extending direction of pressure display scale with the lifting direction of pressure adjusting screw is unanimous, be equipped with on the valve casing just to the scale pointer that the pressure display scale set up.

Preferably, the valve casing is equipped with the mounting hole that runs through on it, the pressure adjusting screw bottom segment is equipped with the pressure adjusting screw external screw thread, the bottom segment of mounting hole be equipped with pressure adjusting screw external screw thread fit's valve casing internal thread, the pressure adjusting screw bottom is equipped with the sunken dress hole of twisting that forms, the exhaust flange is including stretching into twist dress hole and with twist the dress arch of twisting that dress hole screw thread links to each other.

Preferably, discharge valve accommodates intracavity wall and is equipped with surveyor's level casing internal thread, the valve casing outside be equipped with surveyor's level casing internal thread fit's valve casing external screw thread, through surveyor's level casing internal thread with valve casing external screw thread fit realizes the hydrostatic surveyor's level casing with dismantling of valve casing links to each other.

Preferably, four square grooves are formed in the top end of the valve shell, and every two square grooves are oppositely arranged in a group.

Preferably, a shell inner cavity is formed in the static level shell, a partition plate is arranged in the shell inner cavity, the partition plate divides the shell inner cavity into a static level liquid cavity and a static level air cavity which are arranged along the front and back directions of the static level shell, a stepped hole is formed in the center of the partition plate, and a pressure core body is assembled at the stepped hole; the left end face and the right end face of the static level shell are respectively provided with two air pipe joints communicated with the air cavity; the hydraulic static level with the automatic exhaust function further comprises an RS485 communication line joint communicated with the air cavity.

The invention also discloses a balance adjusting method of the hydraulic static level gauge with the automatic exhaust function, which comprises the following steps:

the first step is as follows: taking a liquid storage pipe filled with antifreeze and more than two sets of hydraulic static levels with the automatic exhaust function, connecting a plurality of hydraulic static levels with the automatic exhaust function with a liquid storage tank through an air pipe, a liquid pipe and an RS485 communication cable, installing an automatic exhaust valve in the hydraulic static level with the automatic exhaust function, and then injecting liquid into the hydraulic static level with the automatic exhaust function through the liquid storage tank through the liquid pipe;

the second step is that: then according to the relative height of the static level gauge and the liquid storage tank, the theoretical pressure P is calculated by the following formula,

P＝p_{anti-freezing fluid}gh, wherein:

p_{anti-freezing fluid}: the density of the anti-freezing solution is,

g: the acceleration of the gravity is carried out,

h: the height difference between the antifreeze in the liquid storage tank and the antifreeze in the static level gauge,

the pressing spring critical pressure F is then calculated according to the following formula,

F＝P*S_{exhaust port}Wherein:

S_{exhaust port}: area of exhaust port

Then the compression amount X of the pressure spring is calculated,

X＝F/K_{spring rate}，

K_{Spring rate}: spring rate

The third step: adjusting screw for adjusting pressure

And rotating the pressure adjusting screw rod to enable the pressure adjusting screw rod to descend by a distance equal to the compression amount X of the pressure applying spring, wherein the valve plug is in a static balance state and completely closes the exhaust port.

(III) advantageous effects

Compared with the prior art, the hydraulic static level with the automatic exhaust function has the advantages that:

the hydraulic static level with the automatic air exhaust function is additionally provided with the automatic air exhaust valve, so that air bubbles can be exhausted in real time in the construction process of the static level, the influence of the air bubbles on the measurement precision is eliminated, and the liquid injection operation requirement is further reduced.

Drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:

FIG. 1 is a cross-sectional view of a hydraulic hydrostatic level with automatic venting according to an embodiment of the present invention;

fig. 2 is a perspective view of one direction of a housing of a hydraulic hydrostatic level with an automatic air-bleeding function according to an embodiment of the present invention;

fig. 3 is a perspective view of the hydrostatic level housing in the hydraulic hydrostatic level with automatic air bleeding according to the embodiment of the present invention in another direction;

FIG. 4 is a perspective view of a pressure adjustment screw and a lock wheel in a hydraulic hydrostatic level with automatic venting according to an embodiment of the present invention;

FIG. 5 is a perspective view of a valve housing in a hydraulic hydrostatic level with automatic venting according to an embodiment of the present invention;

FIG. 6 is an installation view of a hydrostatic level system for a hydraulic hydrostatic level having automatic venting of air in accordance with the present invention;

fig. 7 is an exhaust state diagram of a hydraulic hydrostatic level having an automatic exhaust function according to an embodiment of the present invention.

Description of reference numerals:

1. the hydraulic static level comprises a lock wheel, 2 pressure display scales, 3 scale pointers, 4 valve casings, 5 pressure adjusting screw external threads, 6 exhaust flanges, 7 pressure applying springs, 8 valve plugs, 9 antifreeze liquid, 10 air pipe joints, 11 RS485 communication line joints, 12 liquid pipe joints, 13 static level liquid cavity bodies, 14 first exhaust through holes, 15 second exhaust through holes, 16 static level casing bodies, 17 sealing rings, 161 partition plates, 162 pressure core bodies, 163 transverse liquid cavity pipelines, 165 longitudinal liquid cavity pipelines, 166 exhaust ports, 18 air pipes, 19 liquid pipes, 20 RS485 communication cables and 21 liquid storage tanks.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or connected through the inside of the two elements, or "in transmission connection", that is, connected in a power manner through various suitable manners such as belt transmission, gear transmission, or sprocket transmission. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A hydraulic hydrostatic level with automatic venting according to the present invention will be further described with reference to fig. 1-7.

Referring now to fig. 1 and 7 with more emphasis on the direction of the arrows in fig. 7 being the exhaust direction. A hydraulic hydrostatic level with automatic venting, comprising: the static level comprises a static level shell 16, wherein a transverse liquid cavity pipeline 163 and a longitudinal liquid cavity pipeline 165 communicated with the transverse liquid cavity pipeline 163 are arranged inside the static level shell 16, an air outlet 166 is formed in the upper end of the longitudinal liquid cavity pipeline 165, and an air outlet valve accommodating cavity which is formed by sinking and communicated with the air outlet 166 is formed in the upper part of the static level shell 16; the hydraulic static level with the automatic air exhaust function further comprises an automatic air exhaust valve which is partially contained in the air exhaust valve containing cavity, and the automatic air exhaust valve comprises: the exhaust valve comprises a valve shell 4, an exhaust flange 6, an elastic expansion piece and a valve plug 8, wherein the lower part of the valve shell 4 is accommodated in an exhaust valve accommodating cavity, the valve shell 4 is fixedly connected with the inner wall of the exhaust valve accommodating cavity, the valve shell 4 and the inner wall of the exhaust valve accommodating cavity enclose an exhaust cavity, and the exhaust flange 6, the elastic expansion piece and the valve plug 8 are sequentially arranged between the bottom of the valve shell 4 and the bottom of the exhaust valve accommodating cavity; the valve shell 4 is provided with a first exhaust through hole 14 communicated with the external space, and the exhaust flange 6 is provided with a second exhaust through hole 15 communicated with the first exhaust through hole 14 and the exhaust cavity.

More specifically, a sealing ring 17 is arranged between the valve plug 8 and the bottom of the exhaust valve containing cavity, and the elastic expansion piece is a pressure spring 7.

In this embodiment, the pressure spring 7 is a compression spring, two ends of the transverse liquid chamber pipe 163 are connected to the liquid pipe connector 12, the transverse liquid chamber pipe 163 is connected to the external liquid storage tank 21 through the liquid pipe 19 to perform a hydraulic pressure applying function, and the longitudinal liquid chamber pipe 165 is connected to the automatic exhaust valve.

The valve plug 8 comprises a sealing state and a gas exhaust state, when the valve plug 8 is in the sealing state, the lower part of the valve plug 8 completely seals the gas exhaust hole 166 under the pressure of the pressure spring 7, and the gas exhaust hole is used for blocking the communication between the longitudinal liquid cavity pipeline 165 and the gas exhaust valve accommodating cavity; when the valve plug 8 is in the exhaust state, the valve plug 8 compresses the pressure spring 7 under the action of the pressure in the longitudinal liquid cavity pipeline 165, and the longitudinal liquid cavity pipeline 165 is communicated with the exhaust valve accommodating cavity.

Namely: once the air bubble exists in the static level, the pressure inside the static level is certainly higher than the theoretical pressure, at this time, the hydraulic pressure generated inside the static level exceeds the critical pressure, the pressure spring 7 is further compressed upwards, so as to drive the valve plug 8 to move upwards, and at this time, the air bubble is discharged from the valve plug 8 and the exhaust port 166. It should be noted that: because the density of the air is far less than that of the antifreeze liquid 9, the air is preferentially discharged, and the liquid is not discharged, so that the liquid leakage phenomenon cannot occur. After the air bubbles are discharged, the internal pressure of the static force level gauge returns to the original theoretical pressure, at the moment, the pressure applying spring 7 recovers the original theoretical compression amount, the valve plug 8 is plugged in the air outlet 166 again, and the whole process of one-time automatic air discharging is completed.

In this embodiment, by designing the sealing ring 17, it can be further ensured that the valve plug 8 effectively blocks the exhaust port 166, and the sealing performance is improved.

According to an embodiment of the present invention, the automatic exhaust valve further includes a pressure adjusting screw connected to the exhaust flange 6 and adjusting the compression amount of the pressurizing spring 7.

In the hydraulic static level with the automatic exhaust function, the hydraulic static level with the automatic exhaust function can ensure the automatic exhaust function under different installation working conditions due to the existence of the pressure adjusting screw. The method specifically comprises the following steps: because the height difference range of the static level instrument is between 0.5m and 1m, the internal pressure of the static level instrument is a range value, the control of the pressure applying spring 7 can be realized through the pressure adjusting screw rod, the exhaust threshold value is flexibly controlled, the real-time automatic exhaust function is realized, and the influence of the measurement precision of the static level instrument of the air bubbles is eliminated.

In the above embodiment, the venting threshold is a critical value, and once the value is exceeded, it is proved that there is a bubble in the hydrostatic level housing 16, and the pressure spring 7 is compressed upward, and the valve plug 8 is lifted up, so as to vent. After exhausting, the static level gauge returns to the critical value, and the pressure spring 7 returns to the original threshold state again.

With reference to fig. 4, according to the embodiment of the present invention, the bottom of the pressure adjusting screw is connected to the exhaust flange 6 by a screw thread, and the top of the pressure adjusting screw is fixedly provided with a locking wheel 1 for adjusting the lifting of the pressure adjusting screw. In this embodiment, the diameter of the lock wheel 1 is larger than the diameter of the pressure adjusting screw, and the anti-slip thread is provided on the circumferential side of the lock wheel 1, and the adjustment screw can be lifted by rotating the lock wheel 1, thereby adjusting the pressing force of the pressure spring 7.

According to the specific embodiment of the invention, the pressure display scale 2 is arranged on the pressure adjusting screw, the extending direction of the pressure display scale 2 is consistent with the lifting direction of the pressure adjusting screw, and the scale pointer 3 which is arranged opposite to the pressure display scale 2 is arranged on the valve shell 4. In the embodiment, the pressure display scale 2 is arranged at the middle section of the pressure adjusting screw, and the scale value of the pressure display scale 2 is in direct proportion to the compression distance X of the pressure applying spring 7 and is used for visually displaying the compression amount of the pressure applying spring 7.

According to the specific embodiment of the invention, the valve housing 4 is provided with a mounting hole penetrating through the valve housing, the bottom section of the pressure adjusting screw is provided with a pressure adjusting screw external thread 5, the bottom section of the mounting hole is provided with a valve housing internal thread matched with the pressure adjusting screw external thread 5, the bottom end of the pressure adjusting screw is provided with a screwing hole formed by sinking, and the exhaust flange 6 comprises a screwing bulge extending into the screwing hole and connected with the screwing hole in a threaded manner. In this embodiment, the pressure adjusting screw external thread 5 of the pressure adjusting screw bottom section and the inside valve casing internal thread connection of valve casing 4 twist the downthehole internal thread that has of dress, twist the protruding outside of dress and be equipped with the external screw thread, through the two threaded connection, realize that exhaust flange 6 links to each other with dismantling of pressure adjusting screw.

According to the embodiment of the invention, the inner wall of the exhaust valve accommodating cavity is provided with a level housing internal thread, the outer part of the valve housing 4 is provided with a valve housing external thread matched with the level housing internal thread, and the static level housing 16 is detachably connected with the valve housing 4 through matching of the level housing internal thread and the valve housing external thread.

According to the specific embodiment of the present invention, four square grooves are formed at the top end of the valve housing 4, and the four square grooves are arranged in a group opposite to each other two by two. In this embodiment, the square groove facilitates the use of a tightening tool to secure the tightening operation.

Referring to fig. 2-3, according to the embodiment of the present invention, a housing inner cavity is formed in the housing 16 of the hydrostatic level, the housing inner cavity is provided with a partition 161, the partition 161 divides the housing inner cavity into a hydrostatic level liquid cavity 13 and an air cavity (not shown) arranged along the front-back direction of the housing 16 of the hydrostatic level, a stepped hole is formed in the center of the partition 161, and a pressure core 162 is assembled at the stepped hole; the left end face and the right end face of the static level shell 16 are respectively provided with two air pipe joints 10 communicated with the cavity of an air cavity (not shown); the hydraulic static level with the automatic exhaust function further comprises a connector 11 communicated with the RS485 communication line. In the present embodiment, the front hydrostatic level liquid chamber 13 is used for containing the antifreeze liquid 9. The rear is an air cavity (not shown) space for accommodating the circuit board. Pressure core 162 is used to sense pressure changes. Two air pipe joints 10 communicated with the air cavity (not shown) are used for communicating with the atmosphere, and the influence of the atmospheric pressure on the accuracy of the measured pressure is balanced.

Referring to fig. 5, more specifically, the upper end of the valve casing 4 is provided with a large step hole for exhausting air, the diameter of the large step hole for exhausting air must be larger than the diameter of the intermediate shaft of the pressure adjusting screw, so as to prevent the blocking of the adjusting stroke of the pressure adjusting screw, the middle section of the valve casing 4 is provided with a large exhaust cavity, the lower end of the valve casing 4 is provided with four first exhaust through holes 14, and the center of the bottom end of the valve casing 4 is provided with an internal thread for connecting with the external thread 5 of the pressure adjusting screw to control the adjusting stroke.

More specifically, the hole positions of the four first exhaust through holes 14 at the lower end of the valve housing 4 must be the same as the hole positions of the four second exhaust through holes 15 formed at the lower end of the exhaust flange 6 in the XY plane, so that air bubbles in the hydrostatic level can be smoothly discharged.

More specifically, the lower end of the exhaust flange 6 is assembled with the pressure spring 7 by welding.

More specifically, the lower end of the pressure spring 7 is assembled with the valve plug 8 by welding.

Referring to fig. 6, the present invention further discloses a balance adjusting method for a hydraulic static level with an automatic exhaust function, which includes the following steps:

the first step is as follows: taking a liquid storage pipe 19 filled with the antifreeze solution 9 and two sets of hydraulic static levels with the automatic air exhaust function in the above embodiments, connecting a plurality of hydraulic static levels with the automatic air exhaust function with a liquid storage tank 21 through an air pipe 18, a liquid pipe 19 and an RS485 communication cable 20, installing an automatic air exhaust valve in the hydraulic static level with the automatic air exhaust function, and injecting liquid into the hydraulic static level with the automatic air exhaust function through the liquid storage tank 21 and the liquid pipe 19.

The second step is that: and then, calculating theoretical pressure P by the following formula according to the relative installation height of the static level gauge and the liquid storage tank.

P＝p_{Anti-freezing fluid}gh, wherein:

p_{anti-freezing fluid}: density of the antifreeze solution.

g: acceleration of gravity.

h: and the height difference between the antifreeze in the liquid storage tank and the antifreeze in the static level gauge.

The pressing spring critical pressure F is then calculated according to the following formula.

F＝P*S_{Exhaust port}Wherein:

S_{exhaust port}: area of exhaust port

Then the compression amount X of the pressure spring is calculated,

X＝F/K_{spring rate}，

K_{Spring rate}: spring rate

It should be noted that the P value may also be sensed by hydrostatic level pressure core 162.

The third step: adjusting screw for adjusting pressure

The pressure adjusting screw is rotated to descend by a distance equal to the compression amount X of the pressure spring 7, and at this time, the valve plug 8 is in a static equilibrium state and the valve plug 8 completely closes the exhaust port.

In this embodiment, the liquid pipe 19 is connected to the liquid pipe joint 12, and the valve plug 8 is in a balanced state in the above manner, when the static level has a bubble, the pressure inside the static level is necessarily higher than the theoretical pressure, and at this time, the hydraulic pressure generated inside the static level exceeds the critical pressure, and the pressure applying spring 7 is further compressed upward, so as to drive the valve plug 8 to move upward, and at this time, the bubble is discharged from the valve plug 8 and the gas outlet 166. After the air bubbles are discharged, the internal pressure of the static force level gauge returns to the original theoretical pressure, at the moment, the pressure applying spring 7 recovers the original theoretical compression amount, the valve plug 8 is plugged in the air outlet 166 again, and the whole process of one-time automatic air discharging is completed.

Compared with the prior art, the hydraulic static level with the automatic air exhaust function is additionally provided with the automatic air exhaust valve, so that air bubbles can be exhausted in real time in the construction process of the static level, the influence of the air bubbles on the measurement precision is eliminated, and the liquid injection operation requirement is further reduced.

In addition, because the pressure adjusting screw is arranged in the hydraulic static level with the automatic exhaust function, the application range of the hydraulic static level with the automatic exhaust function is effectively expanded, and the hydraulic static level with the automatic exhaust function can still realize the automatic exhaust function under different installation working conditions. By adopting the structure of the hydraulic static level with the automatic exhaust function, the volume of the internal liquid cavity of the static level can be effectively reduced, so that the space for accommodating bubbles of the static level is reduced, and the influence of the bubbles on the precision is further reduced. The hydraulic static level with the automatic exhaust function has the advantages that the relative positions of the liquid pipe joint, the air pipe joint and the RS485 communication line joint of the static level are staggered greatly compared with the traditional static level, and the hydraulic static level is convenient to construct and install.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.