CN210371155U

CN210371155U - Screw type air compressor with one-way protection valve

Info

Publication number: CN210371155U
Application number: CN201920845810.5U
Authority: CN
Inventors: 金剑安; 方俊波; 方斌; 周涛; 徐森飞
Original assignee: Zhejiang Vocke Refrigeration Equipment Co ltd
Current assignee: Zhejiang Vocke Refrigeration Equipment Co ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-04-21
Anticipated expiration: 2029-06-05

Abstract

The utility model discloses a screw air compressor with a one-way protection valve, which comprises a shell, wherein the shell is provided with an air inlet pipeline and an inner cavity provided with a screw, and the air inlet pipeline is communicated with the air in the inner cavity; a fixing piece and a valve body which can contact with the fixing piece under the action of gas pressure to form air inlet pipeline sealing or is far away from the fixing piece to form an air inlet pipeline open circuit are arranged in the air inlet pipeline of the shell; the valve body is provided with an air equalizing hole communicated with the air inlet pipeline; the utility model discloses a can prevent that the air causes parts such as bearing and screw rod to take place the reversal towards the air inlet direction backward flow fast in the casing when the compressor is closed, causes the part wearing and tearing.

Description

Screw type air compressor with one-way protection valve

Technical Field

The utility model relates to a compressor technical field especially relates to a screw air compressor with one-way protection valve.

Background

The screw type refrigeration compressor has simple structure and less parts, does not have wearing parts like an air valve, a piston ring and the like, has precise matching of main friction parts such as a rotor, a bearing and the like, once the compressor stops rotating, a large amount of gas in the compressor can push the screw and the like to rotate reversely, so that the abrasion of internal parts is caused, and the long-term stable use of the screw type refrigeration compressor is not facilitated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screw air compressor with one-way protection valve, this utility model can prevent when the compressor is closed that the air causes parts such as bearing and screw rod to take place to reverse towards the air inlet direction backward flow fast in the casing, causes the part wearing and tearing.

For solving the technical problem, the technical proposal of the utility model is that: a screw air compressor with a one-way protection valve comprises a shell, wherein the shell is provided with an air inlet pipeline and an inner cavity provided with a screw, and the air inlet pipeline is communicated with the inner cavity in an air mode;

a fixing piece and a valve body which can contact with the fixing piece under the action of gas pressure to form air inlet pipeline sealing or is far away from the fixing piece to form an air inlet pipeline open circuit are arranged in the air inlet pipeline of the shell; the valve body is provided with an air equalizing hole communicated with the air inlet pipeline.

In a further improvement, a through hole is formed in the middle of the fixing piece, and the valve body comprises a head capable of sealing the through hole and a rod body extending downwards from the head. The valve body has a simple structure and is convenient for opening and closing the air inlet pipeline.

The valve body is arranged in the shell through a spring, an installation pipe is arranged in the shell, and a rod body of the valve body extends into the installation pipe; one end of the spring is fixedly connected with the lower end face of the head, the other end of the spring is fixedly connected inside the shell, and the mounting pipe is nested inside the spring. In the process of air intake of the valve body, the valve body is pressed downwards, the spring is compressed, the valve body moves downwards, and the air intake pipeline forms an open circuit; when the compressor stops working, the air inlet pipeline stops air inlet, the spring recovers to the initial length, the valve body returns, the upper end face of the valve body is in contact with the lower end face of the fixing piece to form sealing, the air in the inner cavity is prevented from rapidly flowing back from the air inlet pipeline to cause the reversing of parts such as a bearing and a screw rod of the inner cavity in precise matching, and the abrasion of the parts is avoided. The utility model discloses in, the installation pipe has certain guide effect to the body of rod with the valve body, does benefit to the valve body and reciprocates along a fixed orbit, prevents that the head of valve body from taking place the skew, guarantees that the valve body closely forms the effective sealing of air inlet pipeline with the mounting cooperation, prevents that the gaseous rapid reflux of inner chamber from causing part reversal and wearing and tearing.

In a further improvement, the head comprises a convex part protruding upwards in the middle and a sealing part positioned at the edge; the air equalizing hole is positioned on the convex part. When the utility model discloses a when one-way protection valve is in encapsulated situation, guarantee that equal gas pocket is not sheltered from, do benefit to the gaseous slow discharge of inner chamber, finally reach the atmospheric pressure balanced state of inner chamber and external environment, avoid the equipment internal and external pressure unbalanced, influence the use of equipment.

In a further improvement, the air equalizing hole is in a step shape with a large upper part and a small lower part. The utility model discloses when being in encapsulated situation, the air of inner chamber flows to the upper end from the equal gas pocket lower extreme, can guarantee the slow voltage-sharing of inner chamber and external environment on the one hand, according to Bernoulli's equation, the big pressure of velocity of flow is little, and the velocity of flow is little under pressure, and the air current is because the change of equal gas pocket internal diameter from little to big, and the velocity of flow changes for from big to little, reduces the noise that probably produces when exhausting.

The improved structure is characterized in that the fixing piece is circular, and a plurality of notches are uniformly formed in the upper portion of the fixing piece along the circumference. The fixing piece is convenient to install in the air inlet pipeline.

In a further improvement, a shoulder for mounting the fixing piece is arranged in the shell; the head of the valve body moves up and down along the inner surface of the shoulder. The head of valve body is in reciprocate in the shoulder, do benefit to the valve body and reciprocate along fixed orbit, the utility model discloses higher reliability and stability have to and the leakproofness.

By adopting the technical scheme, the beneficial effects of the utility model are that:

the utility model forms the air inlet or sealing of the air inlet pipeline by contacting or keeping away from the fixing piece under the action of the air inlet pressure of the valve body; when the compressor is in a working state, air is introduced to push the air inlet pipeline of the valve body to form an open circuit, and the compressor works normally; when the compressor stops working, the valve body contacts the fixing piece, and the air inlet pipeline forms a seal to prevent the gas in the inner cavity from rapidly flowing back; the air sealed in the inner cavity is slowly discharged to the inner cavity through the air equalizing hole and is the same as the air pressure of the external environment, and the air in the inner cavity is discharged at a low speed, so that the parts such as a screw rod, a bearing and the like in the inner cavity which are precisely matched are prevented from rotating, the abrasion caused by the rotation is avoided, the stability of the compressor is improved, and the service life of the compressor is prolonged.

Thereby achieving the above object of the present invention.

Drawings

FIG. 1 is a cross-sectional view of a screw air compressor having a one-way protection valve in accordance with the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a perspective view of the retainer in engagement with the valve body;

FIG. 4 is a front view of the retainer engaging the valve body;

fig. 5 is a top view of the retainer engaging the valve body.

In the figure:

a housing 1; an air intake line 11; a screw 12; an inner cavity 13; a mounting tube 14; a shoulder 15; a fixed member 2; a through hole 21; a notch 22; a valve body 3; a gas homogenizing hole 31; a head portion 32; the boss portion 321; a sealing portion 322; a rod body 33; and a spring 4.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.

The embodiment discloses a one-way protection valve of a screw 12 type air compressor, which comprises a shell 1, wherein the shell 1 is provided with an air inlet pipeline 11 and an inner cavity 13 provided with a screw 12, and the air inlet pipeline 11 is in air communication with the inner cavity 13;

a fixing piece 2 and a valve body 3 which can be contacted with the fixing piece 2 under the action of gas pressure to form a seal of the air inlet pipeline 11 or be far away from the fixing piece 2 to form an open circuit of the air inlet pipeline 11 are arranged in the air inlet pipeline 11 of the shell 1; the valve body 3 is provided with an air equalizing hole 31 communicated with the air inlet pipeline 11.

In this embodiment, the fixing member 2 is provided with a through hole 21 at the middle portion thereof, and the valve body 3 includes a head portion 32 capable of sealing the through hole 21 and a rod body 33 extending downward from the head portion 32. The valve body 3 is simple in structure and facilitates opening and closing of the air inlet pipeline 11.

In this embodiment, the valve body 3 is installed in the housing 1 through a spring 4, an installation pipe 14 is arranged in the housing 1, and the rod body 33 of the valve body 3 extends into the installation pipe 14; one end of the spring 4 is fixedly connected to the lower end face of the head portion 32, the other end of the spring 4 is fixedly connected to the inside of the shell 1, and the mounting pipe 14 is nested in the spring 4. In the air intake process of the valve body 3 in the embodiment, the valve body 3 is pressed downwards, the spring 4 is compressed, the valve body 3 moves downwards, the valve body 3 is far away from the fixing part 2, the through hole 21 of the fixing part 2 is opened, and the air intake pipeline 11 forms an open circuit; when the compressor stops working, the air inlet pipeline 11 stops air inlet, the spring 4 recovers to the initial length, the valve body 3 returns, the upper end face of the valve body 3 is in contact with the lower end face of the fixing part 2 to form sealing, the air in the inner cavity 13 is prevented from rapidly flowing back along the air inlet pipeline 11 from the inner cavity 13 to cause the bearing of the inner cavity 13 and the parts in precise fit such as the screw 12 to be reversed, and the abrasion of the parts caused by the reversal is avoided. In this embodiment, the installation tube 14 has a certain guiding effect on the rod body 33 of the valve body 3, and is beneficial to the valve body 3 to move up and down along a fixed track, so as to prevent the head 32 of the valve body 3 from deviating, ensure that the valve body 3 and the fixing part 2 are matched to closely form effective sealing of the air inlet pipeline 11, and prevent the rapid backflow of the gas in the inner cavity 13 from causing part reversal and abrasion.

The head 32 in this embodiment includes a convex portion 321 protruding upward in the middle and a sealing portion 322 at the edge; the air equalizing hole 31 is located at the protruding portion 321. When the one-way protection valve of this embodiment was in encapsulated situation, guaranteed that gas hole 31 is not sheltered from, did benefit to the gas of inner chamber 13 and slowly discharged, finally reached the balanced state of atmospheric pressure of inner chamber 13 and external environment, avoided the inside and outside pressure of equipment unbalance, influenced the use of equipment.

In this embodiment, the air equalizing hole 31 is stepped with a large top and a small bottom. When this embodiment is in a sealed state, the air in the inner cavity 13 flows from the lower end to the upper end of the air equalizing hole 31, on the one hand, the slow pressure equalization between the inner cavity 13 and the external environment can be ensured, according to the bernoulli equation, the flow velocity is large, the pressure is small, the flow velocity is small, the pressure is strong, the flow velocity changes from large to small due to the change of the inner diameter of the air equalizing hole 31 from small to large, and the noise which may be generated during the exhaust process is reduced.

In this embodiment, the fixing member 2 is circular, and a plurality of notches 22 are uniformly formed on the upper portion of the fixing member 2 along the circumference. The mounting 2 is conveniently mounted in the inlet line 11.

In the embodiment, a shoulder 15 for installing the fixing piece 2 is arranged in the shell 1; the head 32 of the valve body 3 moves up and down along the inner surface of the shoulder 15. The head 32 of the valve body 3 moves up and down in the shoulder 15, so that the valve body 3 can move up and down along a fixed track conveniently, and the guide of the installation pipe 14 and the rod body 33 is matched.

The working process of the embodiment is as follows:

in the embodiment, the air inlet pipeline 11 is contacted or separated from the fixing piece 2 under the action of the air inlet pressure of the valve body 3 so as to form air inlet or sealing; when the compressor is in a working state, air is fed to push the air inlet pipeline 11 of the valve body 3 to form an open circuit, and the compressor works normally; when the compressor stops working, the valve body 3 contacts the fixing part 2, and the air inlet pipeline 11 forms a seal to prevent the gas in the inner cavity 13 from rapidly flowing back; the air sealed in the inner cavity 13 is slowly discharged to the inner cavity 13 through the air equalizing hole 31 and is the same as the air pressure of the external environment, and the air discharged from the inner cavity 13 is slow, so that the parts such as the screw 12, the bearing and the like in the inner cavity 13 which are precisely matched are prevented from rotating, the abrasion caused by the rotation is avoided, the stability of the compressor is improved, and the service life of the compressor is prolonged.

The above embodiments and drawings are not intended to limit the forms and modes of the present embodiments, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present embodiments.

Claims

1. A screw air compressor with a one-way protection valve is characterized in that:

the screw rod type air conditioner comprises a shell, wherein the shell is provided with an air inlet pipeline and an inner cavity provided with a screw rod, and the air inlet pipeline is communicated with the inner cavity in an air mode;

2. The screw air compressor with a one-way protection valve of claim 1, wherein: the mounting middle part is equipped with the through-hole, the valve body is including the head that can seal the through-hole and the body of rod by head downwardly extending.

3. A screw air compressor with a one-way protection valve as set forth in claim 2 wherein: the valve body is arranged in the shell through a spring, an installation pipe is arranged in the shell, and a rod body of the valve body extends into the installation pipe; one end of the spring is fixedly connected with the lower end face of the head, the other end of the spring is fixedly connected inside the shell, and the mounting pipe is nested inside the spring.

4. A screw air compressor with a one-way protection valve as set forth in claim 2 wherein: the head part comprises a convex part which is convex upwards in the middle and a sealing part which is positioned at the edge; the air equalizing hole is positioned on the convex part.

5. The screw air compressor with a one-way protection valve of claim 1, wherein: the air equalizing hole is in a ladder shape with a large upper part and a small lower part.

6. The screw air compressor with a one-way protection valve of claim 1, wherein: the mounting is circular, the upper portion of mounting evenly is equipped with a plurality of breachs along the circumference.

7. A screw air compressor with a one-way protection valve as set forth in claim 2 wherein: a shoulder used for installing the fixing piece is arranged in the shell; the head of the valve body moves up and down along the inner surface of the shoulder.