CN202023929U - Low-pressure sealing system applied to segmental type die cores or dies - Google Patents

Abstract

The utility model relates to a low-pressure sealing system applied to a mold core or a mould, in particular to a sealing system for a joint of a segmented mold core or a mold of a wind power blade. The low-pressure sealing system consists of two parts: the inner sealing system (1) and the outer low-pressure sealing system. The outer sealing system includes the air guide system (2), the large sealing space (4), the air pressure measurement system (5), and the sealing rubber ring (3) and air extraction system (6), the air guide system (2) includes at least one air guide groove; the large sealed space (4) includes at least one sealed container; the air pressure measurement system (5) It consists of at least one vacuum gauge or barometer; the sealing rubber ring (3) isolates the guide groove from the external atmospheric pressure, and through the pressure difference between the inside and outside of the sealing rubber ring (3), it deforms and clings to the groove wall to achieve a sealing effect; The air extraction system (6) includes a vacuum pump, an air extraction pipeline and a regulating valve. The low-pressure sealing system of the utility model can be used for the sealing of the joints of the mold cores or molds (7) of large-scale wind power blades, so as to ensure that the joints of the mold cores or mold equipment are not damaged during the vacuum injection process of the mold or blades. Air leakage, so as to ensure the quality of suction and injection, and at the same time, it is easy to monitor and maintain during use.

Description

A low-pressure sealing system for segmented cores or molds

technical field

The utility model relates to a low-pressure sealing system applied to segmented mold cores or moulds, in particular to a sealing system for the joints of segmented mold cores or molds of wind power blades. the

Background technique

A wind turbine is a power machine that converts wind energy into mechanical energy. The wind turbine uses the wind to drive the blades to rotate, and then increases the speed of rotation through a speed increaser to promote the engine to generate electricity. the

Although my country's wind power industry started late, it has developed rapidly. In recent years, the installed capacity has doubled, and the models have also been upgraded from the original 850kW to 1.5MW, 2.0MW, 3.0MW and other large units. The length has also increased from more than 20 meters to more than 60 meters now. the

At present, wind power blades are mainly formed by vacuum suction injection process, which requires the mold for producing blades to have very good airtightness to ensure that there is no air leakage during the suction injection process of the blades and the quality of the blades. The mold is made of a mold core (also called a female mold in engineering). In order to ensure the airtightness of the mold, vacuum injection is also used in the process of manufacturing the mold. This also requires a very good airtightness on the surface of the mold core. sex. the

Due to the limitation of processing conditions, the current mold core processing still adopts the method of segmented processing, so the connection between the various segments of the mold core and how to ensure that the joints are not leaking are very critical links. In addition, as the size of the blade increases, the size of the mold becomes larger. For the convenience of transportation, the mold is also manufactured in sections, which also involves the problem of sealing the connection. Moreover, the mold needs to be turned over during use. Airtightness is difficult to maintain, and it is difficult to find air leaks, cannot be monitored, and is difficult to maintain. the

Utility model content

Aiming at the shortcomings and deficiencies of the prior art, the purpose of this utility model is to provide a low-pressure sealing system applied to mold cores or moulds, which is used for sealing the joints of mold cores or molds of large wind power blades, and ensures that the mold cores or molds are During the vacuum infusion of molds or blades, the joints of the equipment do not leak air, thereby ensuring the quality of the molds or blades, and at the same time, it is easy to monitor and maintain during use. the

In order to solve the above-mentioned technical problems, the utility model provides a low-pressure sealing system applied to mold cores or moulds, including an inner layer sealing system and an outer layer low-pressure sealing system, the inner layer sealing system is arranged at the connection, In order to isolate the working space and the outer low-pressure sealing system, it plays the role of the first layer of sealing; the outer low-pressure sealing system keeps the external air pressure of the inner sealing system at a low pressure, so that the working space is isolated from the atmosphere. the

Preferably, the inner sealing system is made of a sealing rubber strip or an elastic inflatable sealing ring. Due to the small pressure difference between both sides of the inner sealing system, it is not suitable for O-ring type sealing materials. the

Preferably, the outer low-pressure sealing system includes an air guide system, a large sealed space, an air pressure measurement system, an air extraction system and a sealing rubber ring, the four systems are connected, the air pressure is the same, and are isolated from the atmospheric pressure, and the air guide system includes At least one air guide groove; the large sealed space includes at least one sealed container; the air pressure measurement system includes at least one vacuum gauge or barometer; the sealing rubber ring isolates the air guide groove from the external atmospheric pressure, and the sealing rubber ring The pressure difference between the inside and the outside makes it deformed to be close to the tank wall to achieve a sealing effect; the pumping system includes a vacuum pump, a pumping pipeline and a regulating valve. the

Preferably, the air guide system is generally an air guide groove, which takes up little space and has good conformability. The air guide system completely isolates the inner layer sealing system from the external atmospheric pressure by way of air guide grooves. The air guide system is connected to the large sealed space, and keeps low pressure during operation. The outer seal system is pumped by the air extraction system to maintain the low pressure of the air guide system and the large seal space, and reduce the pressure of the inner seal system. The side pressure difference reduces air leakage. the

Preferably, the sealed space is generally a large sealed container (such as a steel drum), which increases the volume of the space and reduces the impact rate of air leakage. the

Preferably, the air pressure measurement system generally consists of one or two vacuum gauges (or barometers), which are connected to the entire low-pressure system to directly measure the air pressure of the low-pressure system. the

Preferably, the air extraction system is mainly composed of an air extraction pipeline, a valve, and a vacuum pump. the

Compared with the prior art, the low-pressure sealing system provided by the utility model has the following remarkable features:

1. The inner sealing system isolates the working space from the outer low-pressure sealing system, and the outer low-pressure sealing system isolates the working space from the outer atmospheric pressure, so as to achieve a low pressure gradient outside the working space, reduce air leakage and maintain sealing.

2. When the system is running, the working space is depressurized to a near vacuum state, and the outer low-pressure sealing system is also reduced to a near-vacuum state at the same time. The pressing speed is consistent with the working space. After the low-pressure state of the working space is stable, the air pressure of the outer low-pressure sealing system is also kept low-pressure and stable. After the work in the working space is completed, end the low-pressure state of the outer low-pressure sealing system. the

3. This double-layer low-pressure sealing system can complete the sealing work efficiently, as long as the low-pressure state of the outer low-pressure sealing system is maintained, which is more efficient than a simple one-layer sealing (it is difficult to detect whether the seal is leaking), And lower maintenance costs. the

Description of drawings

Fig. 1 is a structural schematic diagram of the low-pressure sealing system provided by the utility model. the

Detailed ways

The content of the utility model is described below in conjunction with the accompanying drawings. The following description is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model. the

Fig. 1 is a schematic cross-sectional structure diagram of the low-pressure sealing system provided by the utility model. the

As shown in Figure 1, the low-pressure sealing system provided by the utility model includes an inner layer sealing system 1 and an outer layer low-pressure sealing system, and the outer layer low-pressure sealing system includes an air guide groove 2, an O-shaped rubber ring 3, a large container 4, a vacuum Table 5, air extraction conduit 6, valve (not shown in the figure) and air extractor (not shown in the figure). the

The inner sealing system 1 (composed of sealing rubber strips) isolates the working space 8 from the air guide groove 2 of the outer low-pressure sealing system, and plays the role of the first layer of sealing. the

The air guide groove 2 communicates with the large container 4, and the entire outer low-pressure sealing system is evacuated by the air suction conduit 6 through an aspirator or a vacuum pump to maintain the low-pressure state of the entire outer low-pressure sealing system, so that the two sides of the inner sealing system 1 The side pressure difference is very small. The vacuum gauge 5 is used to display the pressure state of the outer low-pressure sealing system. the

The O-shaped rubber ring 3 isolates the air guide groove 2 from the external atmospheric pressure, and through the pressure difference between the inside and outside of the O-shaped rubber ring, it deforms and clings to the groove wall to achieve a sealing effect. the

When the pressure in the working space 8 starts to decrease, the pressure of the outer low-pressure sealing system also decreases along with the pumping. This process can be controlled by the display of the vacuum gauge in the working area 8 and the vacuum gauge 5 on the large container 4 . Because the total volume of the large container 4 is much smaller than the working space, the control method is relatively simple. Basically, the pumping speed can be controlled by adjusting the valve (not shown on the way) on the pumping pipeline 6 . the

When the vacuum degree of the working space 8 reaches the requirement, the vacuum degree displayed by the vacuum gauge 5 also maintains a relatively high level at the same time, and the goal is to maintain a relatively low pressure difference on both sides of the inner sealing system 1 . In this way, the working space 8 can be kept at this joint without air leakage. the

The low-pressure sealing system of the utility model can ensure that the inner layer sealing system 1 does not leak as long as the outer low-pressure sealing system is in a certain vacuum degree (depending on the vacuum degree requirements of the working space). the

If the vacuum gauge 5 shows that the vacuum degree is insufficient and the air pressure is not low enough, it means that there is an air leak in the inner low-pressure system. Either open the valve to increase the pumping volume to maintain the vacuum degree, or carry out maintenance. the

Due to the existence of the large container 4, the size of the container can be adjusted. Therefore, the size of the container can be determined according to the requirements of the degree of vacuum and the airtight properties of the equipment, so as to achieve such a purpose: when the pumping valve of the container 4 is closed for a certain period of time , the pressure in the container 4 rises slowly, or after the gas is pumped out stably, the pressure in the container 4 can be kept low enough, so low that the pressure difference with the working space 8 is small. the

The above is only a description of the implementation of the utility model. It should be pointed out that due to the limitation of literal expression, there are objectively unlimited specific structures. Under the premise of the principle, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model. the

Claims (4)

1. A low-pressure sealing system, which is applied to segmented mold cores or molds of wind power blades. There are joints between the segmented mold cores or molds, and it is characterized in that: the low-pressure sealing system includes an inner layer sealing system and an outer layer low-pressure A sealing system, the inner sealing system is arranged at the connection to isolate the working space from the outer low-pressure sealing system; the outer low-pressure sealing system keeps the external air pressure of the inner sealing system at a low pressure, so that the working space and the outer low-pressure sealing system are kept at a low pressure. Atmospheric isolation. 2 . The low-pressure sealing system according to claim 1 , wherein the inner layer sealing system is formed of a sealing rubber strip or an elastic inflatable sealing ring. 3 . 3. The low-pressure sealing system according to claim 1 or 2, wherein the outer low-pressure sealing system comprises an air guide system, a large sealing space, an air pressure measurement system, an O-shaped rubber ring and an air extraction system, and the The air guide system includes at least one air guide groove; the large sealed space includes at least one sealed container; the air pressure measurement system includes at least one vacuum gauge or barometer; the O-shaped rubber ring isolates the air guide groove from the external atmospheric pressure , through the pressure difference between the inside and outside of the O-shaped rubber ring, make it deformed and cling to the tank wall; the pumping system includes a vacuum pump, pumping pipes and valves. 4. The low-pressure sealing system according to claim 3, characterized in that the air guiding system is connected to the large sealing space, and the outer sealing system is pumped by an air extraction system to keep the air guiding system and the large sealing space The low pressure in the space reduces the pressure difference on both sides of the inner sealing system and reduces air leakage.

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