CN201074592Y - Least pressure valve for air-actuated self-force type screw compressor - Google Patents
Least pressure valve for air-actuated self-force type screw compressor Download PDFInfo
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- CN201074592Y CN201074592Y CNU2007200431690U CN200720043169U CN201074592Y CN 201074592 Y CN201074592 Y CN 201074592Y CN U2007200431690 U CNU2007200431690 U CN U2007200431690U CN 200720043169 U CN200720043169 U CN 200720043169U CN 201074592 Y CN201074592 Y CN 201074592Y
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Abstract
The utility model discloses a pneumatic self-operated type minimum pressure valve of a screw compressor, which belongs to a compressor component. The utility model comprises a valve body (1), wherein an air inlet port (2) and an air outlet port (3) are arranged respectively on two ends of the valve body (1), a valve port (4) is arranged in the valve body (1), a piston (5) which is used to control the open and close of the valve port (4) is installed on the valve port (4), the piston (5) is composed of an upper piston (501) and a lower piston (502), both the upper piston (501) and the a lower piston (502) are sleeved on the an axis pin (6), one surface of the lower piston (502) is matched with the valve port (4), the upper piston (501) is located in a piston cylinder (10), one end of the upper piston (501) is pressed with the lower piston (502), and the other end of the upper piston (501) is pressed with a pressure regulating spring (7). The utility model is characterized in that an air inlet hole (8) is arranged on the piston cylinder (10) and the air inlet hole (8) is communicated with the air inlet port (2) which is on the valve body (1) through an air guiding pipeline. The utility model has simple structure and can minimize greatly pressure components of the pressure regulating spring, and thereby the valve body size of the minimum pressure valve is lowered greatly.
Description
Technical field
The utility model relates to a kind of compressor part, especially a kind of parts of helical-lobe compressor, specifically a kind of pneumatic self-powering type helical-lobe compressor minimum pressure valve.
Background technique
As everyone knows, minimum pressure valve is one of essential critical component of fuel injection helical lobe compressor, it is mounted in the vitals between compressor oil gas separating device and the user's pipe network, it mainly acts on: the minimum working pressure power that 1, guarantees lubricant oil in the compressor operating process (is generally 0.3～0.5MPa), ensures the compressor safe operation; 2, keep minimum cracking pressure to ensure oil gas separation; 3, safety check function.At present, the screw compressor minimum pressure valve that domestic compressor is made manufacturer production is pure spring structure, it mainly comes the balance supply gas pressure to keep minimum cracking pressure by spring pressure, owing to be subjected to the influence of spring force, general inside nominal diameter is all below 80 millimeters; But along with in recent years, the continuous increase of the flow of screw compression, big latus rectum helical-lobe compressor (latus rectum is more than DN125) then must cause spring huge if still adopt the minimum pressure valve of spring structure, the valve body heaviness is made, installs, dismantles, safeguards all very difficult.
Summary of the invention
The purpose of this utility model is to need to increase the spring size along with the variation of compressor latus rectum at the pure spring minimum pressure valve of helical-lobe compressor, thereby it is big to cause valve body to make installation difficulty, the problem of valve body heaviness designs a kind of pneumatic self-powering type helical-lobe compressor minimum pressure valve that can reduce big latus rectum compressor pressure minimum valve spring size greatly.
The technical solution of the utility model is:
A kind of pneumatic self-powering type helical-lobe compressor minimum pressure valve, comprise valve body 1, the two ends of valve body 1 are respectively equipped with suction port 2 and air outlet 3, in valve body 1, be provided with a valve port 4, the piston 5 that control valve port 4 opens and closes is installed on the valve port 4, piston 5 is made up of upper piston 501 and lower piston 502, upper piston 501 and lower piston 502 all are sleeved on the bearing pin 6, the one side of lower piston 502 matches with valve port 4, upper piston 502 is arranged in piston cylinder 10, and an end and the lower piston 502 of upper piston 502 offset, and the other end and pressure adjusting spring 7 offset, it is characterized in that piston cylinder 10 is provided with inlet hole 8, inlet hole 8 communicates with suction port 2 on the valve body 1 by the air guide pipeline.
Be set with release spring 9 on the relative end of upper piston 501 and lower piston 502, an end and the upper piston 501 of release spring offset, and the other end and lower piston 502 offset.
The beneficial effects of the utility model:
The utility model is by introducing the pneumatic type structure, utilize the gas pressure balancing overwhelming majority piston force of helical-lobe compressor unit self, spring only helps out in the very short time of helical-lobe compressor initial start stage, volume is little, in light weight, be active in one's movements, the reliability height, can reduce the size of spring greatly, lay a good foundation for screw compressor strides forward to the maximization direction.
Description of drawings
Fig. 1 is a schematic representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1.
A kind of pneumatic self-powering type helical-lobe compressor minimum pressure valve, comprise valve body 1, the two ends of valve body 1 are respectively equipped with suction port 2 and air outlet 3, in valve body 1, be provided with a valve port 4, the piston 5 that control valve port 4 opens and closes is installed on the valve port 4, piston 5 is made up of upper piston 501 and lower piston 502, upper piston 501 and lower piston 502 all are sleeved on the bearing pin 6, on the relative end of upper piston 501 and lower piston 502, be set with release spring 9, one end and the upper piston 501 of release spring offset, and the other end and lower piston 502 offset.The one side of lower piston 502 matches with valve port 4, upper piston 502 is arranged in piston cylinder 10, and an end and the lower piston 502 of upper piston 502 offset, and the other end and pressure adjusting spring 7 offset, piston cylinder 10 is provided with inlet hole 8, and inlet hole 8 communicates with suction port 2 on the valve body 1 by the air guide pipeline.
Working principle of the present utility model is:
As Fig. 1: piston 502 upper gas pressure and piston 502 lower gas pressure balance each other, i.e. F2=F3; In the piston cylinder on piston 502 tops owing to introduced pressurized air air inlet pressure P
1The F4 that is under pressure of piston 502 tops in this piston cylinder then, piston 502 suffered spring pressures are F5, piston 501 bottom pressure are F1, for reaching balance, F4 must equate with F1 with the F5 sum, i.e. F1=F4+F5, draw F5=F1-F4 thus, be the pressure difference that spring pressure F5 need overcome F1 and F4, i.e. the pressure that bears of upper piston 502, and under the certain situation of pressure, pressure is directly proportional with compression area, promptly be directly proportional, mean promptly and reduced the F5 value significantly that pressure adjusting spring 7 can be done very for a short time thus so dwindle D3 with the quadratic power of D3, common spring can meet the demands, and has reduced spring manufacture difficulty and valve body assembling difficulty thus.The core of pneumatic self-powering type minimum pressure valve is exactly by gas backpressure balance portion piston force, effectively reduces required spring pressure thus, thereby reduces the spring manufacture difficulty.
The effect of release spring 9 is when the pressure of suction port 2 reduces suddenly, guarantees that lower piston 501 can in time move down to push down valve port 4, pours in down a chimney to prevent the gas in the air outlet 3.
It is same as the prior art that the utility model does not describe part in detail.
Claims (2)
1. pneumatic self-powering type helical-lobe compressor minimum pressure valve, comprise valve body (1), the two ends of valve body (1) are respectively equipped with suction port (2) and air outlet (3), in valve body (1), be provided with a valve port (4), the piston (5) that control valve port (4) opens and closes is installed on the valve port (4), piston (5) is made up of upper piston (501) and lower piston (502), upper piston (501) and lower piston (502) all are sleeved on the bearing pin (6), the one side of lower piston (502) matches with valve port (4), upper piston (502) is arranged in piston cylinder (10), one end of upper piston (502) and lower piston (502) offset, the other end and pressure adjusting spring (7) offset, it is characterized in that piston cylinder (10) is provided with inlet hole (8), inlet hole (8) communicates with suction port (2) on the valve body (1) by the air guide pipeline.
2. according to the described pneumatic self-powering type helical-lobe compressor minimum pressure valve of claim 1, it is characterized in that on upper piston (a 501) end relative, being set with release spring (9) with lower piston (502), one end of release spring and upper piston (501) offset, and the other end and lower piston (502) offset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200431690U CN201074592Y (en) | 2007-08-14 | 2007-08-14 | Least pressure valve for air-actuated self-force type screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200431690U CN201074592Y (en) | 2007-08-14 | 2007-08-14 | Least pressure valve for air-actuated self-force type screw compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201074592Y true CN201074592Y (en) | 2008-06-18 |
Family
ID=39519855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200431690U Expired - Fee Related CN201074592Y (en) | 2007-08-14 | 2007-08-14 | Least pressure valve for air-actuated self-force type screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201074592Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520103B (en) * | 2009-02-10 | 2011-01-19 | 南通市红星空压机配件制造有限公司 | Balance type minimum pressure valve |
-
2007
- 2007-08-14 CN CNU2007200431690U patent/CN201074592Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520103B (en) * | 2009-02-10 | 2011-01-19 | 南通市红星空压机配件制造有限公司 | Balance type minimum pressure valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080618 Termination date: 20120814 |