Liquid level meter

Abstract

The utility model discloses a liquid level meter which comprises a shell, at least a first flow channel and a second flow channel are formed in the shell. The first connecting hole is used for communicating an external air source with the first flow channel and the second flow channel; the second connecting hole is located at the terminal end of the first flow channel; the third connecting hole is located at the terminal end of the second flow channel; a connecting piece is embedded in at least one of the first connecting hole, the second connecting hole and the third connecting hole, and the connecting piece is used for detachably connecting the joint in a sealing manner; a packing groove is formed in the outer wall face of the connecting piece, and a part of the shell is embedded into the packing groove so that the connecting piece and the shell can be fixedly connected in a sealed mode. According to the utility model, the connecting piece is introduced between the shell and the joint, so that the processing difficulty of the shell is reduced; the packing groove is formed in the outer wall of the connecting piece, so that a part of the shell can be embedded into the packing groove, the connecting strength between the shell and the connecting piece is high, the sealing performance of the connecting piece and the shell is enhanced, gas cannot leak from a gap in the periphery of the connecting piece, and accurate detection of the liquid level meter is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of high-precision liquid detection, in particular to a liquid level meter. Background Art

[0002] Liquid level gauges are suitable for semiconductor manufacturing processes and chemical processes, especially for high-precision detection of liquids such as pure water, acids, alkalis, solvents, etc. that do not adhere to the detection nozzle. For example, the liquid level of liquids such as sulfuric acid or hydrofluoric acid stored in the groove structure for cleaning semiconductors can be measured and output in the form of an electrical signal.

[0003] Patent JP3609722B2 of the prior art discloses a liquid level detection device, which discloses a gas supply mechanism for supplying liquid level detection gas such as nitrogen or air connected to a supply pipe, two branch pipes are connected to the supply pipe, and the two branch pipes are respectively provided with a throttling hole, and these throttling holes have the same opening area so that the gas flow and pressure through the throttling hole remain stable. The ends of the two branch pipes respectively face the interior of the liquid medicine tank, and the end of one branch pipe extends into the liquid medicine tank so that it contacts the liquid, and the end of the other branch pipe is arranged above the liquid medicine tank, so that it is located above the liquid and does not contact the liquid. Pressure gauges are connected to point A downstream of the throttling hole of the branch pipe and point B downstream of the throttling hole of the branch pipe. The pressure gauge measures the gas pressure passing through point A and the gas pressure passing through point B, and displays the difference between the two pressures. The pressure gauge obtains the value obtained by subtracting the measured value Pb at point B from the measured value Pa at point A, that is, Pa-Pb=P3+P4. The controller accurately identifies only P3 by subtracting the calculated pressure P4 caused by surface tension from the value P3+P4 measured by the pressure gauge. P3 is the pressure of the liquid only at the end 12a of the branch pipe. Through P3=ρgh, the depth from the end 12a of the branch pipe to the liquid surface 6a can be determined as h. In the controller, the height H of the end 12a of the branch pipe from the bottom of the liquid medicine tank is pre-entered. Therefore, the liquid level height in the liquid medicine tank becomes H+h, thereby accurately determining the liquid height in the liquid medicine tank, that is, the liquid amount in the liquid medicine tank can be correctly managed, and the liquid volume in the liquid medicine tank can be accurately controlled to avoid excessive or insufficient liquid.

[0004] However, in the detection device that implements the detection principle of the above patent, the shell must be provided with an air intake connection hole, a liquid level detection connection hole, and an ambient pressure detection connection hole, and the above connection holes must be sealed and connected to the air intake joint, the liquid level detection joint, and the ambient pressure detection joint respectively. When the joint and the connection hole are directly sealed, the joint will be affected by the pressure on the air intake side, and the joint will not seal well, resulting in gas leakage. For example, when the joint is sealed in a connection hole with NPT threads or RC threads, firstly, it is very difficult to form NPT threads or RC threaded holes on the shell. Secondly, even if NPT threads or RC threaded holes are formed, for example, when a metal joint is directly screwed together, the connection hole on the plastic shell will be worn, and the sealing effect of the connection between the two is not good. It is easy to leak under the action of gas flow pressure. Once a gas leak occurs at any position in the gas flow path, the detection value of the liquid level gauge will be inaccurate. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the utility model provides a liquid level gauge, which has a connecting piece with a packing groove between the shell and the joint, and utilizes the connecting piece to achieve a stable sealing and fixing effect between the shell and the joint. At the same time, the connection between the connecting piece and the joint has little impact on the shell.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a liquid level meter, comprising:

[0007] The housing is formed with at least a first flow channel and a second flow channel;

[0008] a first connecting hole formed in the housing for connecting an external gas source with the first flow channel and the second flow channel;

[0009] a second connection hole formed in the housing and located at a terminal end of the first flow channel;

[0010] a third connection hole formed in the housing and located at a terminal end of the second flow channel;

[0011] At least one of the first connection hole, the second connection hole and the third connection hole is embedded with a connecting piece, and the connecting piece is used for detachably sealing the connection joint;

[0012] A filling groove is provided on the outer wall of the connecting piece, and a part of the shell is embedded in the filling groove, so that the connecting piece and the shell are sealed and fixedly connected.

[0013] The liquid level gauge provided by the utility model introduces a connector as an intermediate medium between the shell and the joint, and there is no need to process and form a sealing thread in the shell, which reduces the difficulty of processing and manufacturing the shell; a packing groove is provided on the outer wall surface of the connector, and the shell and the outer wall surface of the connector are sealed and fixed, and a part of the shell is embedded in the inner wall of the packing groove to achieve sealing and fixation. At least one of these two sealing fixations is achieved to ensure the sealing of the outer periphery of the connector. At this time, not only the connection strength between the shell and the connector is met, but also the connection contact path between the two becomes tortuous due to the existence of the packing groove, which is better than a case where the outer wall surface of the connector is completely smooth. In this case, it is easy to form a seamless seal and fixation in the circumferential direction, and then under the action of a certain degree of gas flow pressure, the shell and the connector will hardly loosen and cause gas leakage, that is, when the joint is subjected to gas pressure during the air intake and outlet process, the gas will not leak from the peripheral gaps of the connector. In summary, the connector replaces the direct sealing connection between the joint and the shell, and the shell is partially embedded in the packing groove, which not only realizes the effective fixed connection between the shell and the connector, but also plays a beneficial role in the sealing between the shell and the connector, and is not easily affected by the gas flow pressure to fail the seal, which is beneficial to the final accurate detection of the liquid level meter.

[0014] Furthermore, the filling groove includes a sealing groove, which extends in a direction parallel to or inclined to the axis of the connecting member.

[0015] With such an arrangement, when the shell and the connector are combined, part of the shell will also be embedded in the sealing groove. Since the sealing groove is arranged along a parallel or inclined axis, the axial extension length of the sealing groove is increased, so that more parts of the shell can also be embedded in the sealing groove along a parallel or inclined axis, and the shell and the connector can also form a stable connection in the axial direction.

[0016] Furthermore, there are multiple sealing grooves, and the multiple sealing grooves are spaced apart along the circumferential direction of the connector, and adjacent sealing grooves are arranged in parallel and are not connected to each other.

[0017] In this way, multiple sealing grooves are arranged along the circumference of the connector, so that the shell and the connector have a high connection strength along the circumference, and the airtightness of the shell and the connector along the circumference can be guaranteed.

[0018] Furthermore, there are multiple sealing grooves, and the multiple sealing grooves are arranged along the circumferential direction of the connecting piece, and adjacent sealing grooves are connected.

[0019] Such an arrangement, in addition to ensuring a higher connection strength between the shell and the connector in a circumferential direction, adjacent sealing grooves are arranged to cross and communicate. When part of the shell is embedded in the sealing groove, the path of the two being combined is more tortuous and complex, which not only enhances the connection strength between the shell and the connector, but also the path of the shell partially embedded in the sealing groove becomes interconnected and complex. Such a complex sealing path further increases the sealing performance; specifically, when the shell is injection-molded to bury the connector, the slurry must flow in the sealing groove, which increases the filling path of the slurry in the sealing groove, so that almost all sealing grooves are filled with slurry, and after the slurry solidifies, the connection path of the sealing groove is more complex to enhance the sealing connectivity. The slurry between adjacent sealing grooves can be interconnected, so that even if some parts of the sealing grooves are not filled with slurry in the early stage of the shell injection molding process, slurry will be added in the later stage due to the interconnection reason, and it is not easy for some sealing grooves to have gaps that are not filled, thereby not causing an unstable connection between the shell and the connector, nor causing a poor sealing effect between the shell and the connector, and the risk of gas leakage between the shell and the connector is greatly reduced. In addition, compared with the situation where the liquid in the sealing grooves that are arranged in parallel and are not connected to each other does not flow with each other, it can further minimize the situation where the sealing grooves are not filled and there are gaps, so that the connection strength between the shell and the connecting piece is better, and the sealing effect between the two is better.

[0020] Furthermore, the sealing groove includes a first sealing groove and a second sealing groove that cross and communicate with each other, and the first sealing groove of each sealing groove crosses and communicates with the second sealing groove of the adjacent sealing groove.

[0021] With such arrangement, parts of the shell are respectively embedded in the interconnected first sealing groove and the second sealing groove, the connection sealing path becomes more complex and tortuous, and the connection strength and sealing are further enhanced; specifically, such as the liquid during the injection molding of the shell, when the first sealing groove of one of the sealing grooves of the same sealing groove is not filled with liquid, not only will the liquid in the second sealing groove also flow to the first sealing groove to make up for the filling and achieve sealing, but at the same time, the liquid in the first sealing groove or the second sealing groove of another adjacent sealing groove will also flow to the above-mentioned first sealing groove that is not filled with liquid to make up for the filling and achieve sealing.

[0022] Furthermore, the filling groove includes a connecting groove, which is opened around the circumference of the connecting piece, and the connecting groove is connected to the sealing groove.

[0023] With such a setting, not only a part of the housing is embedded in the sealing groove to achieve connection and sealing functions in the axial direction parallel or inclined to the connecting member, but also a part of the housing is embedded in the surrounding connecting groove to be fixedly connected in the circumferential direction of the connecting member. The setting of the connecting groove mainly serves to increase the connection strength between the housing and the connecting member. Under the action of a certain gas flow pressure, the connection between the housing and the connecting member remains stable; the connecting groove and the sealing groove are connected and cooperate with each other, making the sealing path and the fixed connection path of the combination of the housing and the connecting member more complex after a part of the housing is embedded in the packing groove, greatly enhancing the connection strength and sealing performance between the housing and the connecting member; in the processing form of integrally injection-molding the housing with the connecting member buried therein, part of the liquid material in the connecting groove can flow into the sealing groove to supplement the liquid material in the sealing groove, and vice versa, the liquid material in the sealing groove can also be supplemented into the connecting groove, thereby increasing the connection strength between the area where the sealing groove is located and the housing and improving the connection and sealing performance.

[0024] Further, the depth of the connecting groove is greater than the depth of the sealing groove.

[0025] With such a setting, the depth of the connecting groove is increased. On the one hand, the connection strength between the housing and the connecting member can be further increased to ensure a stable connection between the housing and the connecting member. On the other hand, the different depths of the connecting groove and the sealing groove form a structure similar to a step, so that the sealing path and the fixed connection path between the connecting member and the housing are more complex, enhancing the connection strength and sealing performance between the housing and the connecting member; in the processing form of integrally injection-molding the housing with the connecting member buried therein, the increase in the depth of the connecting groove enables it to accumulate more injection liquid material, and then part of the liquid material in the connecting groove can flow into the sealing groove, making the connection strengths of the connecting groove, the sealing groove and the housing all improved.

[0026] Further, the connecting groove includes a first connecting groove and a second connecting groove which are arranged at intervals along the axial direction of the connecting member. The cross-section of the first connecting groove is in a U-shape, and the cross-section of the second connecting groove is in a C-shape. The second connecting groove is located on the inner side in the axial direction of the first connecting groove.

[0027] With such a setting, the cross-section of the second connection groove is C-shaped, increasing the possibility that a part of the housing is embedded in the second connection groove and completely fills the second connection groove. As a result, the connection sealing performance between the housing and the connecting member at the second connection groove is better. The cross-section of the first connection groove is U-shaped. After a part of the housing is embedded in the first connection groove, the tensile strength between the two is greater, and their connection is more stable, which further has a favorable impact on the sealing performance. Especially in the processing form where the housing is integrally injection-molded to embed the connecting member, the injection plastic liquid can completely fill the second connection groove, ensuring the sealed fixation between the housing and the connecting member. After the filling liquid is filled in the first connection groove with a U-shaped cross-section, a right-angled groove body is formed, making the tensile strength between the connecting member and the housing greater. The second connection groove is arranged on the axial inner side of the first connection groove. The first connection groove and the second connection groove can form a cooperative effect, enabling the connecting member to form a good sealing effect first at a position closer to the first flow channel or closer to the second flow channel, and forming a high-strength connection effect at a position far from the first flow channel or closer to the second flow channel. Furthermore, it ensures better sealed fixation between the housing and the connecting member and prevents gas leakage due to gas pressure.

[0028] Furthermore, the sealing groove is completely arranged in the axial direction of the connecting member, and the connection groove隔断s the sealing groove.

[0029] With such a setting, the complete arrangement in the axial direction means that the sealing groove extends along the entire axial length of the connecting member, enabling the connection grooves around the circumference of the connecting member to communicate with the sealing groove. When the housing is embedded in the packing groove, the combination path between the two is longer and more tortuous and complex. This not only enhances the connection strength between the housing and the connecting member, but also such a complex sealing path further increases the sealing performance. The connection groove隔断s the sealing groove, so that both sides of the connection groove are hermetically fixed to the housing through the sealing groove, ensuring the hermetic fixation between the connecting member and the housing, avoiding gas leakage at the connection groove, and being beneficial to the stable connection between the connecting member and the housing. In the processing form where the housing is integrally injection-molded to embed the connecting member, the injection plastic liquid in the connection groove can flow to the sealing grooves on both sides, and the flow path of the liquid is longer and more complex, ensuring the effective sealing between the sealing groove and the housing.

[0030] Furthermore, the connecting member is made of metal, the housing is made of plastic, the housing is injection-molded to wrap around the outer periphery of the connecting member, and the liquid of the housing during injection molding is filled into the packing groove. The inner wall of the packing groove and the outer wall surface of the connecting member are both hermetically fixed to the housing.

[0031] It should be noted that the word "隔断" in the original text may not be a standard English word. A more appropriate expression might be "separate" or "divide", but according to the requirements, the original text is directly translated.With this arrangement, the processing technology of the shell is simple, and the material liquid can fully flow into the filler groove during the injection molding process, so that part of the shell is embedded in the filler groove. The connection between the shell and the connector is more stable, and the sealing performance after the connection is better, which will not cause gas leakage, thereby ensuring the accuracy of the liquid level meter detection results.

[0032] Furthermore, a joint is detachably connected to the connecting piece, and the outer wall of the joint has an annular extrusion portion protruding radially outward. An annular seal is clamped between the annular extrusion portion and the outer end face of the connecting piece, and the annular extrusion portion squeezes the annular seal toward the outer end face of the connecting piece to seal it.

[0033] With this arrangement, the annular extrusion portion squeezes the annular seal toward the connecting piece, thereby ensuring the connection sealing between the connecting piece and the joint, avoiding gas leakage between the connecting piece and the joint, and ensuring the high accuracy of the final detection structure of the liquid level gauge.

[0034] The beneficial effects of the present invention are as follows: a connector is introduced between the shell and the joint as an intermediate medium, and there is no need to process and form a sealing thread in the shell, which reduces the difficulty of processing and manufacturing the shell; a packing groove is provided on the outer wall surface of the connector, and the shell and the outer wall surface of the connector are sealed and fixed, and a part of the shell is embedded in the inner wall of the packing groove to achieve sealing and fixing. At least one of these two sealing and fixing methods is achieved to ensure the sealing of the outer periphery of the connector. At this time, not only the connection strength between the shell and the connector is met, but also the connection contact path between the two becomes tortuous due to the existence of the packing groove, which is better than a case where the outer wall surface of the connector is completely smooth. In this case, it is easy to form a seamless seal and fixation in the circumferential direction, and then under the action of a certain degree of gas flow pressure, the shell and the connector will hardly loosen and cause gas leakage, that is, when the joint is subjected to gas pressure during the air intake and outlet process, the gas will not leak from the peripheral gaps of the connector. In summary, the connector replaces the direct sealing connection between the joint and the shell, and the shell is partially embedded in the packing groove, which not only realizes the effective fixed connection between the shell and the connector, but also plays a beneficial role in the sealing between the shell and the connector, and is not easily affected by the gas flow pressure to fail the seal, which is beneficial to the final accurate detection of the liquid level meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A three-dimensional diagram of a liquid level meter provided in an embodiment of the present utility model.

[0036] Figure 2 A cross-sectional view of a liquid level gauge provided in an embodiment of the present utility model.

[0037] Figure 3 for Figure 2 A magnified view of the structure in Figure 2.

[0038] Figure 4This is a three-dimensional diagram of a liquid level meter provided in an embodiment of the present invention, with a connector.

[0039] Figure 5 This is a cross-sectional view of a liquid level gauge provided in an embodiment of the present invention, with a connector.

[0040] Figure 6 for Figure 5 A magnified view of the structure at point B in FIG.

[0041] Figure 7 A three-dimensional diagram of a joint and an annular seal provided in an embodiment of the present invention.

[0042] Figure 8 A three-dimensional diagram of the first structural connecting member provided in an embodiment of the present utility model.

[0043] Figure 9 This is a front view of the first structural connector provided in an embodiment of the present utility model.

[0044] Figure 10 A three-dimensional diagram of the second structural connecting member provided in an embodiment of the present utility model.

[0045] Figure 11 A three-dimensional diagram of a third structural connector provided in an embodiment of the present utility model.

[0046] Figure 12 for Figure 11 Enlarged view of the structure at point C in .

[0047] Figure 13 A three-dimensional diagram of a fourth structural connecting member provided in an embodiment of the present utility model.

[0048] Figure 14 A cross-sectional view of a fourth structural connector provided in an embodiment of the present utility model.

[0049] Figure 15 A three-dimensional diagram of a fifth structural connecting member provided in an embodiment of the present utility model.

[0050] Figure 16 This is a cross-sectional view of a fifth structural connector provided in an embodiment of the present utility model.

[0051] Among them, 1-shell, 11-first flow channel, 12-second flow channel, 13-first connecting hole, 14-second connecting hole, 15-third connecting hole, 16-step surface, 2-connecting piece, 22-transition surface, 3-filling groove, 31-sealing groove, 311-first sealing groove, 312-second sealing groove, 32-connecting groove, 321-first connecting groove, 322-second connecting groove, 4-connector, 41-annular extrusion part, 42-annular sealing piece, 43-connector threaded section, 5-pressure sensor. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0053] like Figure 1-Figure 7 As shown, a liquid level gauge includes a housing 1, which is formed with at least a first flow channel 11 and a second flow channel 12. The housing 1 is formed with a first connection hole 13, a second connection hole 14, and a third connection hole 15. The first connection hole 13 is used to connect an external gas source with the first flow channel 11 and the second flow channel 12. The second connection hole 14 is located at the terminal end of the first flow channel 11, and the third connection hole 15 is located at the terminal end of the second flow channel 12. A pressure sensor 5 is disposed inside the housing 1 and is used to detect the pressure difference between the gas pressures in the first flow channel 11 and the second flow channel 12.

[0054] At least one of the first connecting hole 13, the second connecting hole 14, and the third connecting hole 15 is embedded with a connecting part 2. Specifically, the connecting part 2 is embedded in the first connecting hole 13, or in the second connecting hole 14, or in the third connecting hole 15. Alternatively, the connecting part 2 is embedded in any two of the first connecting hole 13, the second connecting hole 14, and the third connecting hole 15. Alternatively, the connecting part 2 is embedded in all of the first connecting hole 13, the second connecting hole 14, and the third connecting hole 15. The connecting part 2 is used for a detachable and sealed connection joint 4. It should be noted that the joint 4 can be configured as an external part of the liquid level gauge or can be an integral part of the liquid level gauge.

[0055] Specifically, when the first connection hole 13 is embedded with a connector 2, the connector 2 is removably and sealably connected to a joint 4, which is used to seal a delivery pipeline of an external gas source (not shown in the figure). In the past, the first flow channel 11 and the second flow channel 12 transported gas, which can be nitrogen or compressed air. When the second connection hole 14 is embedded with a connector 2, the connector 2 is removably and sealably connected to the joint 4, which is used to seal a liquid level detection tube (not shown in the figure). The liquid level detection tube is used to extend into the liquid in the liquid tank, that is, to extend into the liquid point to be detected. When the third connection hole 15 is embedded with a connector 2, the connector 2 is removably and sealably connected to the joint 4, which can be used to seal a surrounding pressure detection tube (not shown in the figure). The surrounding pressure detection tube extends into the area above the liquid in the liquid tank, that is, into the ambient air above the liquid point to be detected, to detect the ambient pressure above the detection liquid. Alternatively, the connector 2 may not be embedded in the third connection hole 15, or the joint 4 may not be connected, but both methods can ensure that the second flow channel 12 is directly connected to the atmosphere.

[0056] During use, external compressed air enters the shell 1 through the first connecting hole 13, and then splits into two streams. One stream of gas enters the first flow channel 11 and then flows into the liquid in the liquid tank to bubble at point P, so as to feed back the gas pressure in the first flow channel 11 as the total pressure at point P in the liquid and be detected by the pressure sensor 5. The total pressure at point P here includes the effects of the liquid pressure and the ambient pressure / atmospheric pressure on the point P. The other stream of gas enters the second flow channel 12 and then flows into the environment or atmosphere above the liquid, so as to feed back the gas pressure in the second flow channel 12 as the ambient pressure or atmospheric pressure above the liquid and be detected by the pressure sensor 5. Therefore, the pressure difference between the gases in the first flow channel 11 and the second flow channel 12 obtained by the pressure sensor 5 actually means the liquid pressure only at point P in the liquid.

[0057] At this time, if any of the first connection hole 13, the second connection hole 14, and the third connection hole 15 is located at a position where gas leaks due to air pressure, the liquid level gauge will detect inaccurate values. In order to solve the above-mentioned gas leakage problem, the present invention considers providing a connector 2 between the housing 1 and the joint 4. The connector 2 is used to achieve a stable sealing and fixing effect with the housing 1. At the same time, the sealing effect between the connector 2 and the joint 4 is good, and the connection between the connector 2 and the joint 4 has little impact on the housing 1.

[0058] Specifically, such as Figure 3As shown, in this embodiment, the first connection hole 13, the second connection hole 14, and the third connection hole 15 are all cylindrical groove structures, and the inner bottom surface thereof forms a step surface 16 that can abut against the end surface of the connector 2. The inner hollow of the connector 2 forms a transition surface 22 that is sealed and connected to the joint 4. The outer wall surface of the connector 2 is provided with a packing groove 3, and a part of the shell 1 is embedded in the packing groove 3, so that the connector 2 and the shell 1 are sealed and fixedly connected. Among them, the outer wall surface of the connector 2 refers to the originally smooth outer surface. When the packing groove 3 is provided on the outer wall surface, the packing groove 3 will produce an inner wall that is not at the same height as the outer wall surface of the connector 2. The outer wall surface of the connector 2 and / or the inner wall of the packing groove 3 are respectively sealed and fixed to the shell 1, which affects the connection strength and sealing performance of the connector 2 and the shell 1.

[0059] The utility model introduces a connector 2 as an intermediate medium between the shell 1 and the joint 4, and there is no need to process a sealing thread in the shell 1, which reduces the processing difficulty of the shell 1; a packing groove 3 is set on the outer wall of the connector 2. Compared with the outer wall of the connector 2 which is a smooth surface, the shell 1 and the outer wall of the connector 2 are sealed and fixed, and a part of the shell 1 can be embedded in the inner wall of the packing groove 3 to achieve sealing and fixing. At least one of the fixations is satisfied, and the connector 2 has a complete circumferential seal. At this time, the connection strength between the shell 1 and the connector 2 is good, and then the gas flow pressure is adjusted to a certain extent. Under the action of , there is almost no looseness between the shell 1 and the connector 2 to cause gas leakage, that is, when the joint 4 is subjected to the pressure of the gas source during the air intake and outlet process, the gas will not leak from the peripheral gap of the connector 2. In summary, the connector 2 replaces the direct sealing connection between the connector 4 and the shell 1, and the part of the shell 1 is embedded in the packing groove 3, which not only realizes the effective fixed connection between the shell 1 and the connector 2, but also the increase in the strength of the fixed connection has a beneficial effect on the sealing connection between the shell 1 and the connector 2, and is not easily affected by the gas flow pressure to cause sealing failure. Ultimately, the detection result of the liquid level gauge is more accurate.

[0060] More specifically, in this embodiment, the connector 2 is made of metal, the housing 1 is made of plastic, and the housing 1 is processed by injection molding. Specifically, during the process of wrapping the housing 1 with the pre-embedded connector 2, the connector 2 is first fixed with a fixture, and then the housing 1 is manufactured by injection molding using the mold cavity around the periphery of the connector 2. The liquid material used to form the housing 1 is filled into the filling groove 3. After the liquid material cools and solidifies, it forms an adhesive seal with the outer wall of the connector 2 and the inner wall of the groove. At this time, the first connection hole 13 and / or the second connection hole 14 and / or the third connection hole 15 of the housing 1 are formed by pre-embedded outer contours of the connector 2. The housing 1 is injection molded and wrapped around the periphery of the connector 2, thereby achieving a sealed fixation between the housing 1 and the connector 2. The shell 1 is injection molded. During the injection molding process, the slurry is flowing, so that the slurry can be filled into the filling groove 3, so that the inner wall of the filling groove 3 and the outer wall of the connecting piece 2 are sealed and fixed to the shell 1, and the connection between the shell 1 and the connecting piece 2 is more stable, thereby ensuring that under the action of gas pressure, the connection between the shell 1 and the connecting piece 2 can maintain a good sealing effect.

[0061] Of course, in other embodiments, the shell 1 can also be pre-injection molded, and then the first connection hole 13 and / or the second connection hole 14 and / or the third connection hole 15 can be processed on the shell 1, and a protrusion that is adapted to the shape of the filling groove 3 is provided on the inner wall of the connection hole, and the protrusion is heated and welded to the inner wall of the filling groove 3, or the protrusion extends into the filling groove 3 and is bonded to it by glue, etc., so as to achieve sealing and fixation. The sealing and fixing method between the shell 1 and the filling groove 3 is not specifically limited, and the protrusion and the filling groove 3 can both be spiral. In addition, the inner wall of the connection hole and the outer wall surface of the connector 2 can also be sealed and fixed by the above-mentioned welding or bonding method.

[0062] Specifically, the packing groove 3 includes a sealing groove 31, which extends parallel to the axis of the connector 2, or extends obliquely to the axis of the connector 2. The connector 2 may be cylindrical, with the axis perpendicular to the housing 1. The shape of the sealing groove 31 is not limited herein, and may be strip-shaped or spiral-shaped. There is no limit on the number of sealing grooves 31, nor is there a limit on whether the sealing groove 31 extends the entire axial length of the connector 2.

[0063] like Figure 8 、 Figure 9As shown, in a first embodiment of the packing groove 3 provided by the connector 2, the sealing groove 31 extends along the entire axial length of the outer wall of the connector 2. The axis of the connector 2 is the O line, and the sealing groove 31 extends in a direction parallel to the O line. There are multiple sealing grooves 31, and the multiple sealing grooves 31 are spaced apart along the circumference of the connector 2. Adjacent sealing grooves 31 are arranged in parallel and are not connected to each other. When the housing 1 is injection molded to embed the connector 2, the injection molding liquid flows into each sealing groove 31. Therefore, when the housing 1 and the connector 2 are connected, the housing 1 is partially embedded in the sealing groove 31 and bonded to the inner wall of the groove and the outer wall of the connector 2. In addition, the housing 1 is partially embedded in the sealing groove 31 around the circumference of the connector 2. This ensures a high connection strength between the housing 1 and the connector 2. Subsequently, under the action of gas pressure, the housing 1 and the connector 2 will not loosen and cause gas leakage. While achieving an effective fixed connection between the housing 1 and the connector 2, a good sealing effect between the housing 1 and the connector 2 is ensured.

[0064] like Figure 10 As shown, in the second embodiment of the packing groove 3 provided by the connector 2, the sealing groove 31 extends along the entire axial length direction of the outer wall surface of the connector 2, the axis of the connector 2 is the O line, the sealing groove 31 extends in a direction inclined to the O line, and the number of the sealing grooves 31 is multiple, and the multiple sealing grooves 31 are arranged in a full circle along the circumferential direction of the connector 2, and adjacent sealing grooves 31 are arranged in parallel and are not connected to each other. Compared with the sealing groove 31 extending in a direction parallel to the O line, the sealing groove 31 is extended at an angle, which increases the axial extension length of the sealing groove 31, so that more shell 1 material can be embedded in the sealing groove 31; more importantly, the extension path of the sealing groove 31 becomes longer, which increases the probability of the shell 1 material filling into the sealing groove 31. In other words, when the material cannot completely fill the entire length of the sealing groove 31 during the injection molding of the shell 1, lengthening the extension path of the sealing groove 31 can increase the probability of the shell 1 material entering any position of the sealing groove 31, thereby increasing the connection strength between the shell 1 and the connector 2, and the connection sealing performance of the two is better; in addition, the sealing groove 31 is set at an angle, so that the shell 1 and the connector 2 form a stable connection in the circumferential direction, and the shell 1 and the connector 2 can also form a stable connection in the axial direction. The connection between the shell 1 and the connector 2 is more stable, thereby achieving a more effective sealing effect.

[0065] like Figure 11 、 Figure 12As shown, in a third embodiment of the packing groove 3 provided by the connector 2, the sealing groove 31 extends the entire axial length of the outer wall of the connector 2. There are multiple sealing grooves 31, which are arranged along the circumference of the outer wall of the connector 3, and adjacent sealing grooves 31 are connected. Unlike the connector 2 structures of the two previous embodiments, in which the sealing grooves 31 are single, straight strips, in this embodiment, adjacent sealing grooves 31 are connected to each other to enhance the fluidity of the material during injection molding of the housing 1.

[0066] Specifically, the sealing groove 31 includes a first sealing groove 311 and a second sealing groove 312 that cross and communicate with each other, wherein the first sealing groove 311 of each sealing groove 31 is connected to the second sealing groove 312 of the adjacent sealing groove 31. The sealing groove 31 is X-shaped, so that adjacent sealing grooves 31 are also cross-connected and interconnected, and then multiple sealing grooves 311 are interwoven on the outer wall of the connector 2 to form a mesh groove structure. Here, the sealing groove 31 is X-shaped, which means that the first sealing groove 311 extends in a direction inclined to the O line, and the second sealing groove 312 also extends in a direction inclined to the O line. The inclination directions of the two are different, forming a cross-shaped and connected structure. Of course, the sealing groove 31 can also be cross-shaped, or in a well-shaped, or in a swastika-shaped, without specific limitation.

[0067] Therefore, compared with the sealing groove 31 being a single straight strip, and the adjacent sealing grooves 31 not crossing or communicating with each other, preferably, the structure of the sealing groove 31 in this embodiment includes a first sealing groove 311 and a second sealing groove 312 that cross and communicate, and the adjacent sealing grooves 31 cross and communicate. The above structural design increases the filling path of the slurry in the sealing groove 31 when the shell 1 injection-moldedly wraps the connector 2, so that almost all the sealing grooves 31 are filled with slurry, and the flow path of the slurry in the sealing groove 31 is more tortuous and complex, which increases the filling path of the slurry in the sealing groove 31. Even if the first sealing groove 311 of one of the sealing grooves 31 is not filled with slurry, the slurry in the second sealing groove 312 of the sealing groove 31 will also be filled with slurry. The liquid flows to the first sealing groove 311 to achieve sealing, or in other words, the liquid in the first sealing groove 311 or the second sealing groove 312 of another adjacent sealing groove 31 will also flow to the above-mentioned first sealing groove 311 that is not filled with liquid to achieve sealing. In summary, the liquid between adjacent sealing grooves 31 can be interconnected, so that even if some parts of the sealing grooves 31 are not filled with liquid in the early stage of injection molding of the shell 1, liquid will be replenished in the later stage due to the interconnection, and it is not easy for some sealing grooves 31 to have gaps that are not filled, which will not cause the connection between the shell 1 and the connector 2 to be unstable, and will not cause the sealing effect between the shell 1 and the connector 2 to be poor, and the risk of gas leakage between the shell 1 and the connector 2 is greatly reduced.

[0068] like Figure 13 、 Figure 14 As shown, in a fourth embodiment of the packing groove 3 provided by the connector 2, the packing groove 3 includes, in addition to the sealing groove 31, a connecting groove 32. The connecting groove 32 extends circumferentially along the circumference of the connector 2 and communicates with the sealing groove 31. In this case, a portion of the housing 1 is not only embedded in the sealing groove 31 to achieve connection and sealing, but also partially embedded in the surrounding connecting groove 32, securing the connection circumferentially to the connector 2. The provision of the connecting groove 32 primarily increases the strength of the connection between the housing 1 and the connector 2. Under a certain degree of gas flow pressure, the connection between the housing 1 and the connector 2 remains stable. The synergistic effect of the sealing groove 31 and the connecting groove 32 makes the sealing and fixing paths of the two more complex after the shell 1 is partially embedded in the packing groove 3, greatly enhancing the connection strength and sealing performance between the shell 1 and the connecting member 2. For example, when the shell 1 is injection-molded around the connecting member 2, the liquid material flows to the inner wall of the connecting groove 32, the inner wall of the sealing groove 31, and the outer wall of the connecting member 2. After the liquid material solidifies, it forms a very strong bond between the shell 1 and the connecting member 2. There are no restrictions on the location of the connecting groove 32, nor on the relationship between the connecting groove 32 and the axis line O of the connecting member 2. The opening direction of the connecting groove 32 can be perpendicular to the line O, or the two can be at an angle.

[0069] like Figure 13 and 15 As shown, sealing grooves 31 are formed on both sides of the outer wall of the connector 2, and a connecting groove 32 is formed in the middle area of ​​the outer wall of the connector 2. The sealing grooves 31 on both sides are connected to the connecting groove 32, and the depth of the connecting groove 32 is greater than the depth of the sealing groove 31. In this embodiment, the sealing groove 31 is completely arranged in the axial direction of the connector 2, and the connecting groove 32 divides the sealing groove 31 in the middle of the connector 2, thereby forming a connecting groove 32 in the middle and sealing grooves 31 on both sides. In the figure, the sealing groove 31 is arranged perpendicular to the connecting groove 32. Of course, the sealing groove 31 can also be replaced with the X-shaped sealing groove 31 in the above structure, without specific limitation.

[0070] When the housing 1 is injection-molded to wrap the connecting member 2, the liquid material not only embeds into the sealing groove 31 to achieve the connection and sealing functions, but also flows into the connecting groove 32. The cooperation between the connecting groove 32 and the housing 1 mainly serves to increase the connection strength between the housing 1 and the connecting member 2, thereby enhancing the sealing performance of the connection between the housing 1 and the connecting member 2. Additionally, the connecting groove 32 can accumulate more liquid material, and part of the liquid material can flow into the sealing groove 31 to supplement the liquid material in the sealing groove 31, further increasing the connection strength between the area where the sealing groove 31 is located and the housing 1 and improving the connection sealing performance. The connecting groove 32 and the sealing groove 31 form a cooperative effect. In particular, the depth of the connecting groove 32 is greater than that of the sealing groove 31, extending the bonding path between part of the liquid material of the housing 1 and the connecting member 2, and this bonding path is more tortuous and complex, resulting in a higher connection strength and better sealing effect between the connecting member 2 and the housing 1.

[0071] As Figure 15 , Figure 16 shown, in the fifth embodiment of the packing groove 3 provided by the connecting member 2, the connecting groove 32 includes a first connecting groove 321 and a second connecting groove 322 that are axially spaced along the connecting member 2. Similarly, the sealing groove 31 extends along the entire axial length of the connecting member 2, that is, the sealing groove 31 is completely arranged in the axial direction of the connecting member 2. The first connecting groove 321 and the second connecting groove 322 respectively隔断 the sealing groove 31 at two intermediate positions of the connecting member 2. The unilateral cross-section of the first connecting groove 321 is in a U-shape, and the unilateral cross-section of the second connecting groove 322 is in a C-shape. And when the connecting member 2 is assembled in the housing 1, the second connecting groove 322 is located on the axial inner side of the first connecting groove 321. In other words, the end face of the connecting member 2 close to the second connecting groove 322 abuts against the step surface 16.

[0072] With such a setting, the second connecting groove 322 with a C-shaped cross-section is smoother, making it more likely to be completely filled with liquid material. Setting the second connecting groove 322 on the axial inner side of the first connecting groove 321 enables the connecting member 2 to form a good sealing effect at a position closer to the first flow channel 11 or closer to the second flow channel 12. Furthermore, the sealing effect between the housing 1 and the connecting member 2 is better, and gas leakage will not occur due to gas pressure. After the first connecting groove 321 with a U-shaped cross-section is filled with liquid material, due to the better tensile strength of the right-angled groove body, that is, the connection effect between the inner side wall and the inner bottom wall of the first connecting groove 32 is better, a stronger connection effect is formed between the housing and connecting member 2 at the first connecting groove 321, and the two are more firmly connected, which further has a favorable impact on the sealing performance. The first connecting groove 321 and the second connecting groove 322 can form a cooperative effect to ensure a higher connection strength and better connection sealing performance between the housing 1 and the connecting member 2. It should be noted that there is an unclear expression "隔断" in the original text, which is tentatively translated as "隔断". If there is a more accurate expression, it can be adjusted accordingly.

[0073] In addition, if Figure 4-Figure 7 As shown, when the connector 2 is initially detachably connected to the connector 4, the connector 4 is assembled on the housing 1 and becomes a component of the liquid level gauge. Therefore, the liquid level gauge sold includes the connector 4, which adopts the following structure: the connector 4 and the connector 2 are both made of metal. The outer wall of the connector 4 has a radially outwardly protruding annular extrusion portion 41, and the end of the connector 4 has a threaded section 43. The internal transition surface 22 of the connector 2 is threadedly fixedly connected to the connector threaded section 43. An annular seal 42 is clamped between the annular extrusion portion 41 and the outer end face of the connector 2. The annular extrusion portion 41 squeezes the annular seal 42 toward the outer end face of the connector 2 to seal. The annular seal 42 can be an O-ring or a sealing gasket, and the sealing gasket can specifically be a PTFE gasket or a silicone gasket. This arrangement ensures excellent sealing performance between the connector 2 and the connector 4, thereby achieving a stable connection and good sealing performance between the connector 2 and the housing 1. The connector 2 and the connector 4 can also be sealed, and the final detection result of the liquid level gauge is more accurate.

[0074] It should be noted that the sealing groove 31 extends along the entire axial length of the connector 2, which means that it basically completely extends along the entire axial length of the connector 2, rather than that the two ends of the sealing groove 31 are absolutely flush with the two ends of the connector 2 and fit perfectly. The slight distance between the end of the sealing groove 31 and the end of the connector 2 has no effect, that is, the sealing groove 31 is basically completely arranged in the axial direction of the connector 2.

[0075] Of course, to ensure connection stability and sealing, the joint thread section 43 can be configured as a tapered thread section. Similarly, the transition surface 22 can also be a tapered internal thread structure. In this case, the tapered thread serves both the connection and sealing functions, and the annular extrusion portion 41 and the annular seal 42 can be omitted. Of course, it is also possible to not configure the thread, and the transition surface 22 and the joint 4 can be directly fixed and sealed by an interference fit through the tapered hole and the tapered portion. There is no specific limitation.

[0076] The above specific implementation methods are used to illustrate the present invention rather than to limit the present invention. Any modifications and changes made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A liquid level gauge, comprising: A housing, at least formed with a first flow channel and a second flow channel; A first connection hole formed in the housing for connecting an external gas source to the first flow channel and the second flow channel; A second connection hole formed in the housing and located at the terminal of the first flow channel; A third connection hole formed in the housing and located at the terminal of the second flow channel; characterized in that: At least one of the first connection hole, the second connection hole and the third connection hole is provided with a connecting member for detachably and sealingly connecting a joint; A packing groove is formed on the outer wall surface of the connecting member, and a part of the housing is embedded in the packing groove so that the connecting member and the housing are fixedly connected in a sealed manner.

2. The liquid level gauge according to claim 1, characterized in that: [[ID=VII]]The packing groove includes a sealing groove which extends along a direction parallel to or inclined to the axis of the connecting member.

3. The liquid level gauge according to claim 2, characterized in that: [[ID=VIII]]The number of the sealing grooves is multiple, and the multiple sealing grooves are arranged at intervals along the circumferential direction of the connecting member, and adjacent sealing grooves are arranged in parallel and not connected to each other.

4. The liquid level gauge according to claim 2, characterized in that: [[ID=IX]]The number of the sealing grooves is multiple, and the multiple sealing grooves are arranged along the circumferential direction of the connecting member, and adjacent sealing grooves are connected.

5. The liquid level gauge according to claim 4, characterized in that: [[ID=X]]The sealing groove includes a first sealing groove and a second sealing groove which intersect and communicate with each other, and the first sealing groove of each sealing groove intersects and communicates with the second sealing groove of the adjacent sealing groove.

6. The liquid level gauge according to claim 2, characterized in that: [[ID=XI]]The packing groove includes a connecting groove which is formed by surrounding along the circumferential direction of the connecting member, and the connecting groove and the sealing groove are communicated.

7. The liquid level gauge according to claim 6, characterized in that: [[ID=XII]]The depth of the connecting groove is greater than the depth of the sealing groove.

8. The liquid level gauge according to claim 6, characterized in that: [[ID=XIII]]The connecting groove includes a first connecting groove and a second connecting groove which are arranged at intervals along the axial direction of the connecting member. The cross section of the first connecting groove is in a shape of a square bracket, and the cross section of the second connecting groove is in a shape of a C, and the second connecting groove is located on the axial inner side of the first connecting groove.

9. The liquid level gauge according to claim 6, characterized in that: [[ID=XIV]]The sealing groove is completely arranged in the axial direction of the connecting member, and the connecting groove cuts off the sealing groove.

10. The liquid level gauge according to claim 1, characterized in that: [[ID=XV]]The connecting member is made of a metal material, the housing is made of a plastic material, the housing is injection-molded to wrap around the outer periphery of the connecting member, and the liquid material during the injection molding of the housing fills into the packing groove, and the inner wall of the packing groove and the outer wall surface of the connecting member are both fixedly connected in a sealed manner with the housing.

11. The liquid level gauge according to claim 1, characterized in that: [[ID=XVI]]A joint is detachably connected to the connecting member. The outer wall of the joint has a radially outwardly protruding annular pressing portion, and an annular sealing member is clamped between the annular pressing portion and the outer end surface of the connecting member, and the annular pressing portion presses the annular sealing member against the outer end surface of the connecting member for sealing.

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