Pressure transmitter with composite sealing structure at cable connection side

Abstract

The utility model provides a pressure transmitter with a composite sealing structure on a cable connection side, which comprises a base, a transmitter body, a pressure sensitive element, a signal amplifier and a cable. The signal amplifier and the inner side wall of one end, which is arranged in a square head shape, of the transmitter body are sealed through a sealing assembly, and the cable wiring is connected with the signal amplifier; the sealing assembly comprises a hollow pressing screw, a pressing gasket, a conical sealing sleeve and a cylindrical sealing sleeve. According to the sealing assembly, at least quadruple combined sealing is formed between the hollow pressing screw and the pressing gasket, between the pressing gasket and the conical sealing sleeve, between the pressing gasket and the cylindrical sealing sleeve and between the hollow pressing screw, the pressing gasket, the conical sealing sleeve and the cylindrical sealing sleeve, and therefore it can be ensured that leakage cannot occur on the cable connecting side; and the use reliability and stability of the pressure transmitter are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, and particularly relates to a pressure transmitter with a composite sealing structure on the cable side. Background Technique

[0002] A pressure transmitter mainly consists of three parts: a pressure measuring element sensing unit, a measuring circuit, and a process connector. It can convert physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensing unit into standard electrical signals to supply secondary instruments such as indicating alarm instruments, recorders, and regulators for measurement, indication, and process adjustment. However, the sealing performance of pressure transmitters currently sold on the market is generally poor.

[0003] Therefore, there is an urgent need to propose a pressure transmitter with a composite sealing structure on the cable side to solve the technical problems existing in the prior art. Content of the Utility Model

[0004] Aiming at the technical problem that the sealing performance of pressure transmitters in the prior art is generally poor, the utility model proposes a pressure transmitter with a composite sealing structure on the cable side.

[0005] In a preferred embodiment of the utility model, a pressure transmitter with a composite sealing structure on the cable side is provided. The pressure transmitter includes:

[0006] A base, the base is located at one end of the pressure transmitter, and the base has an internal cavity;

[0007] A transmitter body, one end of the transmitter body is threadedly connected to the base, and the other end is provided with a square head;

[0008] A pressure sensitive element, the pressure sensitive element is arranged in the internal cavity of the base, and the pressure sensitive element is sealed with the side wall of the internal cavity of the base through a sealing member;

[0009] A signal amplifier, the signal amplifier is fixedly arranged in the transmitter body, and the signal amplifier is electrically connected to the pressure sensitive element;

[0010] A cable, the cable extends out from the end of the transmitter body provided with a square head, and is sealed with the inner side wall of the end of the transmitter body provided with a square head through a sealing assembly, and the cable is electrically connected to the signal amplifier; wherein,

[0011] The sealing assembly includes: a hollow press-fit screw, a compression washer, a conical seal sleeve, and a cylindrical seal sleeve. The cable is in interference fit with the hollow press-fit screw, and one end side of the hollow press-fit screw extends out of the end of the transmitter body provided with a square head; the conical seal sleeve is in interference fit with the cable, the reduced-diameter end side of the conical seal sleeve faces away from the end of the transmitter body provided with a square head, the other end side of the conical seal sleeve faces one end side of the hollow press-fit screw located inside the transmitter body, and the other end side of the conical seal sleeve and one end side of the hollow press-fit screw located inside the transmitter body are pressed tightly by the compression washer. The outer periphery of the hollow press-fit screw, the compression washer, and the conical seal sleeve is pressed tightly against the inner wall of one end side of the transmitter body provided with a square head by the cylindrical seal sleeve, and the cylindrical seal sleeve completely covers both end portions of the compression washer.

[0012] Preferably, the material of the conical seal sleeve is selected from any one of nitrile rubber, silicone rubber, and fluororubber.

[0013] Preferably, the pressure-sensitive element and the side wall of the inner cavity of the base are sealed by an O-ring.

[0014] Preferably, a pressure-introducing hole is formed at one end of the base facing away from the end of the transmitter body provided with a square head, and the pressure-introducing hole is in fluid communication with the pressure-sensitive element.

[0015] Preferably, a degassed epoxy resin glue is provided inside the transmitter body, and the signal amplifier is sealed and wrapped by the degassed epoxy resin glue.

[0016] Compared with the prior art, the following beneficial effects can be obtained by the present utility model:

[0017] A pressure transmitter with a composite sealing structure on the cable side of the present application is provided with a sealing assembly with multi-level sealing at one end where the transmitter body is square-headed. The sealing assembly includes: a hollow press-fit screw, a pressing washer, a conical sealing sleeve, and a cylindrical sealing sleeve. The cable is in interference fit with the hollow press-fit screw, and one end side of the hollow press-fit screw extends out of the end where the transmitter body is square-headed. The conical sealing sleeve is in interference fit with the cable, and the reduced-diameter end side of the conical sealing sleeve faces away from the end where the transmitter body is square-headed. The other end side of the conical sealing sleeve faces one end side of the hollow press-fit screw located inside the transmitter body, and the other end side of the conical sealing sleeve and one end side of the hollow press-fit screw located inside the transmitter body are pressed tightly through the pressing washer. The outer peripheries of the hollow press-fit screw, the pressing washer, and the conical sealing sleeve are pressed tightly against the inner wall of one end side where the transmitter body is square-headed through the cylindrical sealing sleeve, and the cylindrical sealing sleeve completely covers both end portions of the pressing washer. Through this sealing method, the sealing assembly forms at least four combinations of seals, namely, the hollow press-fit screw and the pressing washer, the pressing washer and the conical sealing sleeve, the pressing washer and the cylindrical sealing sleeve, and the hollow press-fit screw, the pressing washer, the conical sealing sleeve, and the cylindrical sealing sleeve, thereby ensuring that no leakage occurs on the cable connection side and greatly improving the reliability and stability of the pressure transmitter during use.

[0018] A degassed epoxy resin adhesive is provided inside the transmitter body, and the signal amplifier is sealed and wrapped by the degassed epoxy resin adhesive, thereby improving the operating stability and service life of the pressure transmitter. Brief Description of the Drawings

[0019] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0020] Figure 1 A pressure transmitter with a composite sealing structure on the cable side in one embodiment of the present invention is shown. Detailed Description of the Embodiments

[0021] The following further details each aspect of the present invention.

[0022] Unless otherwise defined or stated, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the method of the present invention.

[0023] Unless otherwise clearly defined and limited, the "or" described in this utility model includes the relationship of "and". The "and" is equivalent to the Boolean logic operator "AND", the "or" is equivalent to the Boolean logic operator "OR", and "AND" is a subset of "OR".

[0024] It can be understood that although terms such as "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, a first element may be referred to as a second element without departing from the teachings of the concept of this utility model.

[0025] In this utility model, the terms "consisting essentially of..." and "consisting of..." are included in the terms "containing", "including" or "comprising".

[0026] Unless otherwise clearly defined and limited, the terms "connected", "communicated", "connected" in this utility model should be understood in a broad sense. For example, it may be a fixed connection, or may be connected through an intermediate medium, may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] For example, if an element (or component) is referred to as being on another element, coupled with another element or connected to another element, then the said one element can be directly formed on, coupled with or connected to the said another element, or there can be one or more intermediate elements between them. On the contrary, if the expressions "directly on...", "directly coupled with..." and "directly connected with..." are used herein, it means there is no intermediate element. Other words used to illustrate the relationship between elements should be interpreted similarly, such as "between..." and "directly between...", "attached" and "directly attached", "adjacent" and "directly adjacent", etc.

[0028] In addition, it should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings. The words "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. It can be understood that herein, these terms are used to describe the relationship of one element, layer or region relative to another element, layer or region as shown in the drawings. Except for the orientations described in the drawings, these terms should also include other orientations of the device.

[0029] Other aspects of this utility model will be obvious to those skilled in the art due to the disclosure herein.

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0031] It should also be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present application. The drawings only show the components related to the present application, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex. For example, the thickness of the elements in the drawings can be exaggerated for clarity.

[0032] Embodiment

[0033] As shown in the Figure 1 accompanying drawings, the present invention realizes a pressure transmitter with a composite sealing structure on the cable side. The pressure transmitter includes:

[0034] A base, which is located at one end of the pressure transmitter, and the base has an internal cavity;

[0035] A transmitter body 15, one end of the transmitter body 15 is threadedly connected to the base, and the other end is provided with a square head;

[0036] A pressure-sensitive element, which is arranged in the internal cavity of the base, and the pressure-sensitive element is sealed with the side wall of the internal cavity of the base through a seal;

[0037] A signal amplifier, which is fixedly arranged in the transmitter body, and the signal amplifier is electrically connected to the pressure-sensitive element;

[0038] A cable 19, which extends from the end of the transmitter body provided with a square head, and is sealed with the inner side wall of the end of the transmitter body provided with a square head through a sealing assembly. The cable 19 is electrically connected to the signal amplifier; wherein,

[0039] The sealing assembly includes: a hollow press-fit screw 18, a compression washer 17, a conical seal sleeve 16 and a cylindrical seal sleeve. The cable 19 is in interference fit with the hollow press-fit screw 18. One end side of the hollow press-fit screw 18 extends out of the end of the transmitter body provided with a square head. The conical seal sleeve 16 is in interference fit with the cable 19. The reduced-diameter end side of the conical seal sleeve 16 faces away from the end of the transmitter body 15 provided with a square head. The other end side of the conical seal sleeve 16 faces one end side of the hollow press-fit screw 18 located inside the transmitter body. And the other end side of the conical seal sleeve 16 and one end side of the hollow press-fit screw 18 located inside the transmitter body are pressed tightly through the compression washer 17. The outer peripheries of the hollow press-fit screw 18, the compression washer 17 and the conical seal sleeve 16 are pressed tightly against the inner wall of one end side of the transmitter body 15 provided with a square head through the cylindrical seal sleeve. The cylindrical seal sleeve completely covers both end portions of the compression washer 17.

[0040] Preferably, the material of the conical seal sleeve 16 is selected from any one of nitrile rubber, silicone rubber, and fluororubber.

[0041] Preferably, the pressure-sensitive element and the side wall of the inner cavity of the base are sealed through an O-ring.

[0042] Preferably, a pressure-introducing hole is provided at one end of the base facing away from the end of the transmitter body provided with a square head. The pressure-introducing hole is in fluid communication with the pressure-sensitive element.

[0043] Preferably, a degassed epoxy resin glue is provided inside the transmitter body 15. The signal amplifier is sealed and wrapped by the degassed epoxy resin glue.

[0044] Preferably, the cable 19 is a waterproof and gas-conducting cable.

[0045] During use, the real-time pressure of the measured medium passing through the pressure-introducing hole of the pressure transmitter with a composite sealing structure on the cable side is transmitted to the pressure-sensitive element. The output signal of the pressure-sensitive element 1 is transmitted to the signal amplifier through a silica gel wire, and is output through the cable 19 at the tail of the transmitter after being processed by the signal amplifier.

[0046] Based on this application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0047] It should be noted that the above-mentioned embodiments can be freely combined as needed. The above is only the preferred embodiment of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

[0048] All documents mentioned in the present utility model are cited in this application as references, just as each document is cited separately as a reference. In addition, it should be understood that after reading the above content of the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A pressure transmitter with a composite sealing structure on the cable connection side, characterized in that, The pressure transmitter includes: a base, which is located at one end of the pressure transmitter, and the base has an internal cavity; a transmitter body, one end of the transmitter body is threadedly connected to the base, and the other end is provided with a square head; a pressure sensitive element, which is arranged in the internal cavity of the base, and the pressure sensitive element is sealed with the side wall of the internal cavity of the base through a seal; a signal amplifier, which is fixedly arranged in the transmitter body, and the signal amplifier is connected to the pressure sensitive element by wiring; a cable, which extends from the end of the transmitter body provided with a square head, and is sealed with the inner side wall of the end of the transmitter body provided with a square head through a sealing assembly, and the cable is connected to the signal amplifier by wiring; wherein, the sealing assembly includes: a hollow pressing screw, a pressing washer, a conical sealing sleeve and a cylindrical sealing sleeve. The cable is in interference fit with the hollow pressing screw, and one end side of the hollow pressing screw extends out of the end of the transmitter body provided with a square head. The conical sealing sleeve is in interference fit with the cable, the reduced-diameter end side of the conical sealing sleeve faces away from the end of the transmitter body provided with a square head, the other end side of the conical sealing sleeve faces the end side of the hollow pressing screw located inside the transmitter body, and the other end side of the conical sealing sleeve and the end side of the hollow pressing screw located inside the transmitter body are pressed tightly through the pressing washer. The outer peripheries of the hollow pressing screw, the pressing washer and the conical sealing sleeve are pressed tightly against the inner wall of one end side of the transmitter body provided with a square head through the cylindrical sealing sleeve, and the cylindrical sealing sleeve completely covers both ends of the pressing washer.

2. The pressure transmitter with a composite sealing structure on the cable connection side according to claim 1, wherein, The material of the conical sealing sleeve is selected from any one of nitrile rubber, silicone rubber and fluororubber.

3. The pressure transmitter with a composite sealing structure on the cable connection side according to claim 2, wherein, The pressure sensitive element is sealed with the side wall of the internal cavity of the base through an O-ring.

4. The pressure transmitter with a composite sealing structure on the cable connection side as described in claim 3, characterized in that, A pressure guiding hole is opened at the end of the base facing away from the end of the transmitter body provided with a square head, and the pressure guiding hole is in fluid communication with the pressure sensitive element.

5. The pressure transmitter with a composite sealing structure on the cable connection side according to claim 4, characterized in that, Defoamed epoxy resin glue is arranged in the transmitter body, and the signal amplifier is sealed and wrapped by the defoamed epoxy resin glue.

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