CN208765789U - A kind of shell of Roots type flowmeter - Google Patents

Abstract

The utility model discloses a kind of shell of Roots type flowmeter, including outer cover body, the outer cover body is cuboid, and internal is the measuring room of Hollow Cylindrical Shaft shape；There are two installing port on the measuring room, described two installing ports are located in two opposites of the outer cover body；Inlet, outlet is additionally provided in other two opposite；One of remaining two opposite is equipped with indicator, is used to indicate the installation direction of inlet, outlet；The axial direction of the measuring room is equipped with upper card interface and lower card interface.The utility model is compared with present technology, and the utility model realizes the design of stand-alone shell structure, separates with machine core, and when maintenance directly replaces machine core, does not need anti-factory-run school table, will not influence measurement accuracy.

Description

A kind of shell of Roots type flowmeter

Technical field

The utility model relates to field of flow meters, and in particular to a kind of shell of Roots type flowmeter.

Background technique

Roots type flowmeter is also known as rotz flowmeter, is mainly used for carrying out accomplished continuously or intermittently air in pipeline or fluid flow The high-precision measuring instrument of measurement.It has precision height, good reliability, light-weight, the service life is long, running noises are low, installs and uses The features such as facilitating rotz flowmeter can scene instruction integrated flux, instantaneous flow, single dose etc., also exportable pulse signal, 4- 20mA or 1-5V analog signal, 485 communications, 4-20mA+HART, MODBUS agreement etc..Rotz flowmeter is by measuring room, metering Rotor, metering unit component (i.e. internal measurement element) and counting indicator component etc. are constituted.Have in the shell of rotz flowmeter One measuring room, have in measuring room it is a pair of or two pairs can tangent rotation waist wheel (being the gear that modulus is 2 in fact), in flow It is co-axially mounted a pair of of driving gear with two waist wheels outside meter shell, they, which are intermeshed, interconnects two waist wheels mutually It is dynamic.Roots type flowmeter is continuously divided into fluid single known volume fractiion using mechanical measurement element, according to meter The number that amount room gradually, is repeatedly full of and discharges the volume fractiion fluid carrys out measuring flow volume total amount.When detected fluid stream When through flowmeter, the dynamic pressure of fluid makes to form a differential pressure between inlet and outlet and waist wheel is pushed to rotate, when fluid forces first axle When upper waist wheel counter-clockwise direction rotates, the waist wheel that the driving gear band being attached thereto moves on the second axis is rotated clockwise, and rotates 90 ° Afterwards, the waist wheel of top is rotated clockwise by fluid forces, and driving gear band moves following waist wheel and rotates counterclockwise；Waist wheel is rotated by 360 ° When, there is the fluid discharge stream meter for being four times in measuring room dischargeable capacity.In this way, two waist wheel exchange driving rotations, with waist wheel Rotation, fluid is via the continuous discharge stream meter of measuring room.The fluid volume of waist wheel every revolution discharge is a fixed value, i.e., Discharge rate is directly proportional to waist wheel shaft revolution, by waist wheel shaft and other transmission mechanisms, is transmitted to meter after the number of rotation is slowed down Calculate display portion.As long as this working principle of exactly rotz flowmeter determines this flowmeter measuring room internal engagement gap Rationally, it just has higher precision and the lower flow that starts, this characteristic is in industry and civilian cell combustion gas for design, assembling Particularly important in metering, it had not only met measuring accuracy when resident is just commonly using gas, but also overcame other type flow juice to residence Small tolerance is helpless when domestic gas ebb.

Most of Roots type flowmeter is inner casing and outer shell integrated at present, when flowmeter breaks down, is needed entire Table removes maintenance or more renews table, increase time cost and more renew telogenesis sheet, and the utility model is a kind of independent Shell can be separated with machine core, and when maintenance directly replaces machine core, do not needed anti-factory-run school table, will not be influenced measurement accuracy.

Utility model content

In order to solve the above-mentioned technical problem, the utility model proposes a kind of shells of Roots type flowmeter, realize independent outer Shell structure, when maintenance, separate with machine core, solve easy to maintenance, and precision is quasi-, problem at high cost.

To achieve the goals above, the utility model adopts the following technical solution:

A kind of shell of Roots type flowmeter, including outer cover body, the outer cover body are cuboid, and internal is open circles The measuring room of axis shape；There are two installing port on the measuring room, described two installing ports are located at the two of the outer cover body In a opposite；Inlet, outlet is additionally provided in other two opposite；One of remaining two opposite is equipped with indicator, uses In the installation direction of instruction inlet, outlet；The axial direction of the measuring room is equipped with upper card interface and lower card interface.

Further, the shape of the upper card interface is " bowl " shape.

Further, the shape of the lower card interface is " the bottom of a pan " shape.

Further, the side of the indicator set there are three corresponded at labeling, at three labelings have warming interface, Pressure sensitivity interface and calibration pressure interface.

Further, the inlet, outlet is surrounded by four mounting holes, and four mounting holes divide equally circumferentially.

The utility model has the advantages that the utility model, compared with present technology, the utility model realizes the design of stand-alone shell structure, with Machine core separation, when maintenance, directly replace machine core, do not need anti-factory-run school table, will not influence measurement accuracy.

Detailed description of the invention

Fig. 1 is the perspective view of the shell of the utility model Roots type flowmeter；

Fig. 2 is the front view of the shell of the utility model Roots type flowmeter；

Fig. 3 is the right view of the shell of the utility model Roots type flowmeter；

Fig. 4 is the top view of the shell of the utility model Roots type flowmeter.

Specific embodiment

Below in conjunction with attached drawing, the structure and working principle of the utility model is described in detail.

As shown in Figure 1, a kind of shell of Roots type flowmeter, including outer cover body, the outer cover body are cuboid, rectangle Body has 6 faces, i.e. 3 pairs of opposites；It is the measuring room 3 of Hollow Cylindrical Shaft shape inside the outer cover body；Have two on the measuring room 3 A installing port, described two installing ports are located in two opposites of the outer cover body；On the measuring room there are also into, Gas outlet 1,2, the inlet, outlet 1,2 are located in other two opposite of the outer cover body；Remaining two right One of facade is equipped with indicator 7, is used to indicate the installation direction of inlet, outlet 1,2；The axial direction of the measuring room 3 is equipped with upper Card interface 8 and lower card interface 9；Design hole location is not needed on the last one face.Two installing ports are maximum two openings in figure, Two installing ports and inlet, outlet 1,2 are chosen opposite in cuboid and are opened up, i.e. perforation outer cover body.

As shown in Fig. 2, the shape of the upper card interface 8 is " bowl " type, the shape of the lower card interface 9 is " the bottom of a pan " type, For installing machine core component.

Such as Fig. 3, the side of the indicator 7 is set there are three at labeling 4,5,6, and 4,5,6 correspond and have at three labelings Warming interface 40, pressure sensitivity interface 50 and calibration pressure interface 60.

As shown in figure 4, the inlet, outlet is surrounded by four the second mounting holes 11, four the second mounting holes 11 are Divide circumferentially, the circle of this circle and inlet, outlet is concentric circles.

Claims (5)

1. a kind of shell of Roots type flowmeter, including outer cover body, the outer cover body is cuboid, and internal is Hollow Cylindrical Shaft The measuring room of shape；It is characterized by: there are two installing port on the measuring room, described two installing ports are located at the shell In two opposites of ontology；Inlet, outlet is additionally provided in other two opposite；One of remaining two opposite, which is equipped with, to be referred to Show device, is used to indicate the installation direction of inlet, outlet；The axial direction of the measuring room is equipped with upper card interface and lower card interface.

2. a kind of shell of Roots type flowmeter as described in claim 1, it is characterised in that: the shape of the upper card interface is to fall " bowl " shape.

3. a kind of shell of Roots type flowmeter as described in claim 1, it is characterised in that: the shape of the lower card interface is " the bottom of a pan " shape.

4. a kind of shell of Roots type flowmeter as described in claim 1, it is characterised in that: the side of the indicator is equipped with three Corresponding at a labeling, at three labelings has warming interface, pressure sensitivity interface and calibration pressure interface.

5. a kind of shell of Roots type flowmeter as described in claim 1, it is characterised in that: the surrounding of the inlet, outlet is set There are four mounting hole, four mounting holes are divided equally circumferentially.