阅读说明：本技术 一种节流孔板代替阀门的密封结构 (Sealing structure for replacing valve with orifice plate ) 是由 王谦 仇小宗 杨志强 常文强 刘亚祜 强盼 侯凯文 张耕春 于 2020-12-26 设计创作，主要内容包括：本发明涉及一种节流孔板代替阀门的密封结构,节流孔板代替阀门的密封结构安装在双吸泵中,包括密封冲洗部分,密封冲洗部分包括密封冲洗管路和与密封冲洗管路配合的密封冲洗管路配件；密封冲洗管路从泵盖两端引出,引出的两端连接到机封压盖冲洗孔或泵盖预留填料冲洗孔。本发明提供的节流孔板代替阀门的密封结构,与传统的密封冲洗结构相比,传统单级双吸水平中开离心泵冲洗管路为带球阀的结构,球阀位置在泵盖顶部两侧分布,位置偏高,现场操作难度大,且调节水量大小难以定量控制,影响机封冲洗性能；另外设计初期未考虑机封和填料泵盖的通用性,增加了开模和物料管理成本,降低了产品通用性。(The invention relates to a sealing structure of a throttle orifice plate replacing a valve, which is arranged in a double-suction pump and comprises a sealing flushing part, wherein the sealing flushing part comprises a sealing flushing pipeline and a sealing flushing pipeline accessory matched with the sealing flushing pipeline; the sealing flushing pipeline is led out from two ends of the pump cover, and the two led-out ends are connected to the machine sealing gland flushing hole or the reserved filler flushing hole of the pump cover. Compared with the traditional sealing and flushing structure, the flushing pipeline of the traditional single-stage double-suction horizontal split centrifugal pump is of a structure with ball valves, the positions of the ball valves are distributed on two sides of the top of the pump cover, the positions are higher, the field operation difficulty is high, the regulated water quantity is difficult to control quantitatively, and the machine seal flushing performance is influenced; in addition, the universality of the machine seal and the filler pump cover is not considered in the initial design stage, the mold opening and material management cost is increased, and the product universality is reduced.)

1. The utility model provides a seal structure of orifice plate replacement valve which characterized in that: the sealing structure that the orifice plate replaces the valve is installed in the double suction pump, the sealing structure that the orifice plate replaces the valve includes: the sealing flushing part comprises a sealing flushing pipeline and a sealing flushing pipeline fitting matched with the sealing flushing pipeline; the sealing flushing pipeline is led out from two ends of the pump cover, and the two led-out ends are connected to the machine sealing gland flushing hole or the reserved filler flushing hole of the pump cover.

2. A sealing structure of an orifice plate replacing a valve according to claim 1, wherein: the sealed flushing component is divided into a structure with an orifice plate and a structure without the orifice plate.

3. A sealing structure of an orifice plate instead of a valve according to claim 2, wherein: the structure with the orifice plate comprises: the device comprises a throttling orifice plate, reducing inner and outer joints, a cutting sleeve type taper thread through pipe joint, a seamless steel pipe and a cutting sleeve type taper thread end right-angle long pipe joint, wherein the throttling orifice plate is directly installed in reserved flushing holes on two sides of a pump cover, the reducing inner and outer joints are fixedly connected with the reserved flushing holes on two sides of the pump cover through threads, the cutting sleeve type taper thread through pipe joint is connected with the reducing inner and outer joints through inner and outer threads, the cutting sleeve type taper thread through pipe joint is connected with the cutting sleeve type taper thread end right-angle long pipe joint through the seamless steel pipe, and the cutting sleeve type taper thread end right-angle long pipe joint is connected with a reserved flushing hole on a sealing cavity.

4. A sealing structure of an orifice plate instead of a valve according to claim 2, wherein: the structure without the orifice plate comprises: cutting ferrule formula awl screw thread straight-through coupling, seamless steel pipe, cutting ferrule formula awl screw thread end right angle long tube connects, and specific connection is: the cutting sleeve type taper thread straight-through pipe joint is directly installed at the reserved flushing hole threads on two sides of the pump cover and is fixedly connected, the cutting sleeve type taper thread straight-through pipe joint and the cutting sleeve type taper thread end right-angle long pipe joint are connected through a seamless steel pipe, and the cutting sleeve type taper thread end right-angle long pipe joint is in threaded connection with a flushing hole reserved in a sealing cavity of the pump cover or a flushing hole in a mechanical sealing gland.

5. A sealing structure of an orifice plate instead of a valve according to claim 2, wherein: when the lift of the double-suction pump is larger than or equal to 70m, a sealing flushing structure with a throttling orifice plate is selected.

6. A sealing structure of an orifice plate instead of a valve according to claim 2, wherein: when the lift of the double suction pump is less than 70m, a sealing flushing structure without the throttling orifice plate is selected.

7. A sealing structure of an orifice plate instead of a valve according to claim 2, wherein: the pump cover and the sealing flushing pipeline are sealed by adopting packing or mechanical seal.

8. A sealing structure of a throttle orifice plate replacing a valve according to claim 7, characterized in that: if the packing sealing is selected, a packing flushing hole is formed in a reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is not machined at the sealing cavity; if mechanical sealing is selected, no filler flushing hole is formed on the reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is processed at the sealing cavity.

Technical Field

The invention relates to a sealing structure, in particular to a sealing structure of a throttle orifice plate replacing a valve, which is convenient to install, reduces the difficulty of field operation, can avoid the operation of field regulation of the flushing water quantity in the later period, improves the universality of products and reduces the cost in multiple directions.

Background

The existing single-stage double-suction horizontal split centrifugal pump flushing pipeline is of a structure with ball valves, the positions of the ball valves are distributed on two sides of the top of a pump cover, the positions are high, the field operation difficulty is high, the regulated water quantity is difficult to control quantitatively, and the machine seal flushing performance is influenced; in addition, the universality of the machine seal and the filler pump cover is not considered in the initial design stage, the mold opening and material management cost is increased, and the product universality is reduced.

Disclosure of Invention

In view of the above problems, the main object of the present invention is to provide a sealing structure for a throttle orifice plate, which is convenient to install, reduces the difficulty of field operation, can avoid the operation of adjusting the amount of flushing water on the field in the later period, improves the product universality, and reduces the cost in multiple directions.

The invention solves the technical problems through the following technical scheme: a sealing structure of an orifice plate replacement valve, which is installed in a double suction pump, comprising: the sealing flushing part comprises a sealing flushing pipeline and a sealing flushing pipeline fitting matched with the sealing flushing pipeline; the sealing flushing pipeline is led out from two ends of the pump cover, and the two led-out ends are connected to the machine sealing gland flushing hole or the reserved filler flushing hole of the pump cover.

In the embodiment example of the invention, the sealed flushing part is divided into a structure with an orifice plate and a structure without the orifice plate.

In an embodiment of the present invention, the structure of the orifice plate includes: the device comprises a throttling orifice plate, reducing inner and outer joints, a cutting sleeve type taper thread through pipe joint, a seamless steel pipe and a cutting sleeve type taper thread end right-angle long pipe joint, wherein the throttling orifice plate is directly installed in reserved flushing holes on two sides of a pump cover, the reducing inner and outer joints are fixedly connected with the reserved flushing holes on two sides of the pump cover through threads, the cutting sleeve type taper thread through pipe joint is connected with the reducing inner and outer joints through inner and outer threads, the cutting sleeve type taper thread through pipe joint is connected with the cutting sleeve type taper thread end right-angle long pipe joint through the seamless steel pipe, and the cutting sleeve type taper thread end right-angle long pipe joint is connected with a reserved flushing hole on a sealing cavity.

In an embodiment of the present invention, the structure without the orifice plate includes: cutting ferrule formula awl screw thread straight-through coupling, seamless steel pipe, cutting ferrule formula awl screw thread end right angle long tube connects, and specific connection is: the cutting sleeve type taper thread straight-through pipe joint is directly installed at the reserved flushing hole threads on two sides of the pump cover and is fixedly connected, the cutting sleeve type taper thread straight-through pipe joint and the cutting sleeve type taper thread end right-angle long pipe joint are connected through a seamless steel pipe, and the cutting sleeve type taper thread end right-angle long pipe joint is in threaded connection with a flushing hole reserved in a sealing cavity of the pump cover or a flushing hole in a mechanical sealing gland.

In the specific implementation example of the invention, when the head of the double-suction pump is greater than or equal to 70m, the sealed flushing structure with the throttling orifice plate is selected.

In the embodiment of the invention, when the head of the double suction pump is less than 70m, a sealing flushing structure without an orifice plate is selected.

In the embodiment of the invention, the pump cover and the sealed flushing pipeline are sealed by filler or by mechanical seal.

In the specific implementation example of the invention, if the packing sealing is selected, a packing flushing hole is formed on a reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is not processed at the sealing cavity; if mechanical sealing is selected, no filler flushing hole is formed on the reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is processed at the sealing cavity.

The positive progress effects of the invention are as follows: the sealing structure for replacing the valve by the orifice plate provided by the invention has the following advantages: the sealing flushing pipeline replaces a conventional pipeline valve with a throttling orifice plate, and a pump cover casting can simultaneously meet two different sealing modes of mechanical sealing and filling in the design initial stage. This kind of novel machine seals washes structure simple to operate reduces the field operation degree of difficulty, can avoid the operation of later stage field control washing water yield, has improved the product commonality, and diversified the cost is reduced, the material management of still being convenient for in addition.

Drawings

Fig. 1-1 is a schematic view of a flushing structure of a seal with an orifice plate according to the present invention.

Fig. 1-2 is a partial enlarged view of fig. 1-1.

FIG. 2 is a schematic view of a flushing arrangement of the present invention without an orifice seal.

Fig. 3 is a schematic structural diagram of an orifice plate.

The following are the names corresponding to the reference numbers in the invention:

the pipe joint comprises a throttling orifice plate 1, an inner joint 2 with different diameters, a clamping sleeve type taper thread through pipe joint 3, a seamless steel pipe 4 and a clamping sleeve type taper thread end right-angle long pipe joint 5.

Detailed Description

The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Fig. 1-1 is a schematic view of a flushing structure of a seal with an orifice plate according to the present invention, and fig. 1-2 is a partially enlarged view of fig. 1-1. FIG. 2 is a schematic view of a flushing arrangement of the present invention without an orifice seal. As shown in the above figures: the invention provides a sealing structure of a throttle orifice plate for replacing a valve, which is arranged in a double-suction pump and comprises the following components: the sealing flushing part comprises a sealing flushing pipeline and a sealing flushing pipeline fitting matched with the sealing flushing pipeline; the sealing flushing pipeline is led out from two ends of the pump cover, and the two led-out ends are connected to the machine sealing gland flushing hole or the reserved filler flushing hole of the pump cover.

The sealed flushing component of the invention is divided into a structure with a throttling orifice plate and a structure without the throttling orifice plate.

Referring to fig. 1-1, the structure with a restriction orifice comprises: the pump cover comprises a throttling orifice plate 1, reducing inner and outer joints 2, a cutting sleeve type taper thread through pipe joint 3, a seamless steel pipe 4 and a cutting sleeve type taper thread end right-angle long pipe joint 5, wherein the throttling orifice plate 1 is directly installed in reserved flushing holes on two sides of the pump cover, the reducing inner and outer joints 2 and the reserved flushing holes on two sides of the pump cover are in threaded connection and fixed, the cutting sleeve type taper thread through pipe joint 3 and the reducing inner and outer joints 2 are in threaded connection, the cutting sleeve type taper thread through pipe joint 3 and the cutting sleeve type taper thread end right-angle long pipe joint 5 are connected through the seamless steel pipe 4, and the cutting sleeve type taper thread end right-angle joint 5 is in threaded connection with a flushing hole reserved in a sealing cavity of the.

Referring to fig. 2, the structure without the orifice plate includes: the cutting sleeve type taper thread straight-through pipe joint 3, the seamless steel pipe 4 and the cutting sleeve type taper thread end right-angle long pipe joint 5 have the following specific connection relations: the cutting sleeve type taper thread straight-through pipe joint 3 is directly installed on the reserved flushing hole threads on two sides of the pump cover and is fixedly connected, the cutting sleeve type taper thread straight-through pipe joint 3 and the cutting sleeve type taper thread end right-angle long pipe joint 5 are connected through the seamless steel pipe 4, and the cutting sleeve type taper thread end right-angle long pipe joint 5 is connected with a flushing hole reserved in the sealing cavity of the pump cover or a flushing hole thread on the mechanical sealing gland in a threaded mode.

When the lift of the double-suction pump is larger than or equal to 70m, a sealed flushing structure with the throttling orifice plate is selected, and when the lift of the double-suction pump is smaller than 70m, a sealed flushing structure without the throttling orifice plate is selected.

The pump cover and the sealing flushing pipeline of the invention adopt packing sealing or mechanical sealing. If the packing sealing is selected, a packing flushing hole is formed in a reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is not machined at the sealing cavity; if mechanical sealing is selected, no filler flushing hole is formed on the reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is processed at the sealing cavity.

According to the difference of different specifications and types of lifts of the double suction pump, the sealing and flushing part is divided into a structure with a throttling orifice plate and a structure without the throttling orifice plate. The sealing flushing pipeline is led out from two ends of the pump cover and connected to a mechanical sealing gland flushing hole or a pump cover reserved packing flushing hole. The sealing flushing pipeline replaces a conventional pipeline valve with a precisely calculated throttle orifice plate, and a pump cover casting is considered to simultaneously meet two different sealing modes of mechanical sealing and filling in the initial design stage. This kind of novel machine seals washes structure simple to operate reduces the field operation degree of difficulty, can avoid the operation of later stage field control washing water yield, has improved the product commonality, and diversified the cost is reduced, the material management of still being convenient for in addition.

In the specific implementation process of the invention, the boss of the pump cover in the figure 1-1 is thickened and provided with a stepped hole, so that the external threaded hole can meet the effective thread depth of the pipe joint and the fixation of the throttle orifice plate, and the internal unthreaded hole can meet the requirement of the wall thickness of the pump body.

The orifice plate bore diameter of the orifice plate of fig. 1-1 was accurately calculated and verified experimentally. The seamless steel pipe 4 in the field bent sealed flushing pipe of fig. 1-1 has no other valves except for the pipe joint. The boss thickness of the pump cover at the position of the throttling orifice plate 1 in the figure 2 is thickened, a stepped hole is formed, and the external threaded hole is guaranteed to meet the effective thread depth of the pipe joint.

The seamless steel pipe 4 in the field bent sealed flushing pipeline in figure 2 has no other valves except the pipe joint.

In the position of a cutting sleeve type taper thread end right-angle long pipe joint 5 on the figures 1 and 2, if packing sealing is selected, a packing flushing hole is formed on a reserved flushing boss of the pump cover, and a mechanical seal positioning groove is not processed at a sealing cavity; if mechanical sealing is selected, no filler flushing hole is formed on the reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is processed at the sealing cavity.

The following is a specific example of implementation:

fig. 1 is a schematic diagram of a sealing and flushing structure with a throttle orifice plate according to the present invention, as shown in fig. 1, when the pump lift of the double suction pump is greater than 70m (reference), the sealing and flushing structure with the throttle orifice plate should be selected, and a proper diameter of the inner hole of the throttle orifice plate is selected according to the shaft diameter of the sealing position, the required sealing and flushing water amount, and the lift value in fig. 3, and at this time, the sealing and flushing structure is composed of the throttle orifice plate 1, the different-diameter inner and outer joints 2, the ferrule type taper thread through pipe joint 3, the seamless steel pipe 4, and the ferrule type taper thread end right-angle long pipe joint 5.

FIG. 2 is a schematic view of a flushing arrangement of the present invention without an orifice seal. As shown in fig. 2, when the lift of the double suction pump is less than 70m (reference), a sealing flushing structure without a throttle orifice plate should be selected, and at this time, the sealing flushing structure is composed of a cutting sleeve type taper thread end right-angle long pipe joint 3, a seamless steel pipe 4 and a cutting sleeve type taper thread straight-through pipe joint 5.

Fig. 3 shows an accurate calculation reference value of the inner hole diameter Φ D of the orifice plate in different specifications and models, and as shown in fig. 3, the orifice plate inner hole diameter Φ D is accurately calculated in the earlier stage under different lifts according to the shaft diameters of different sealing positions, the sealing water flushing amounts required by different horizontal split double-suction pumps in the full series of models, and the model of the orifice plate with the appropriate corresponding model is selected.

Fig. 1 and fig. 2 are schematic diagrams of a mechanical seal structure along a vertical center line to the left, and a filler structure along a vertical center line to the right, wherein if filler sealing is selected, a filler flushing hole is formed in a reserved flushing boss of a pump cover, and a mechanical seal positioning groove is not processed at a sealing cavity; if mechanical sealing is selected, no filler flushing hole is formed on the reserved flushing boss of the pump cover, and a mechanical sealing positioning groove is processed at the sealing cavity.

Compared with the traditional sealing and flushing structure, the flushing pipeline of the traditional single-stage double-suction horizontal split centrifugal pump is of a structure with ball valves, the positions of the ball valves are distributed on two sides of the top of the pump cover, the positions are higher, the field operation difficulty is high, the regulated water quantity is difficult to control quantitatively, and the machine seal flushing performance is influenced; in addition, the universality of the machine seal and the filler pump cover is not considered in the initial design stage, the mold opening and material management cost is increased, and the product universality is reduced.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.