阅读说明：本技术 具有单向阀功能的引射器 (Ejector with one-way valve function ) 是由 王光明 沈磊 于 2021-02-23 设计创作，主要内容包括：本发明提供了一种具有单向阀功能的引射器,引射器包括喷嘴、接受室、混合室、扩压室,接受室上设置有第一引射流体进口,第一引射流体进口上设置有第一单向阀,第一单向阀仅能够使流体从第一单向阀流入第一引射流体进口,扩压室上设置有第二引射流体进口,第二引射流体进口上设置有第二单向阀,第二单向阀仅能够使流体从第二单向阀流入第二引射流体进口,本发明体积小,成本低,质量可靠,安装方便。(The invention provides an ejector with a one-way valve function, which comprises a nozzle, a receiving chamber, a mixing chamber and a pressure expansion chamber, wherein the receiving chamber is provided with a first injection fluid inlet, the first injection fluid inlet is provided with a first one-way valve, the first one-way valve only enables fluid to flow into the first injection fluid inlet from the first one-way valve, the pressure expansion chamber is provided with a second injection fluid inlet, the second injection fluid inlet is provided with a second one-way valve, and the second one-way valve only enables the fluid to flow into the second injection fluid inlet from the second one-way valve.)

1. An ejector with a one-way valve function comprises a nozzle, a receiving chamber, a mixing chamber and a pressure expansion chamber, and is characterized in that:

the receiving chamber is provided with a first injection fluid inlet, the first injection fluid inlet is provided with a first one-way valve, the first one-way valve only enables fluid to flow into the first injection fluid inlet from the first one-way valve, the pressure expansion chamber is provided with a second injection fluid inlet, the second injection fluid inlet is provided with a second one-way valve, and the second one-way valve only enables fluid to flow into the second injection fluid inlet from the second one-way valve.

2. The ejector with a check valve function according to claim 1, wherein:

the first check valve includes: the first valve cover is arranged on the first injection fluid inlet and provided with a first channel, the first valve plate is rotatably arranged on the first valve cover, the first elastic component is used for providing restoring force and pretightening force for the first valve plate, the first valve plate is matched with the cross section of the first channel of the first valve cover, and the first channel can be completely blocked when the first valve plate is closed,

the second check valve includes: the second valve cover is installed on the second injection fluid inlet and provided with a second channel, a second valve plate is rotatably installed on the second valve cover, and a second elastic component is used for providing restoring force and pretightening force for the second valve plate, the second valve plate is matched with the cross section of the second channel of the second valve cover, and the second channel can be completely blocked when the second valve plate is closed.

3. The ejector with a check valve function as claimed in claim 2, wherein:

the first valve plate is positioned at one end of the first valve cover facing the first injection fluid inlet,

the second valve plate is located at one end, facing the second injection fluid inlet, of the second valve cover.

4. The ejector with a check valve function as claimed in claim 3, wherein:

the first valve plate is provided with a first rotating shaft, the first valve cover is provided with a first mounting hole, the first rotating shaft is rotatably mounted in the first mounting hole,

the second valve plate is provided with a second rotating shaft, the second valve cover is provided with a second mounting hole, and the second rotating shaft is rotatably mounted in the second mounting hole.

5. The ejector with a check valve function as claimed in claim 3, wherein:

the first valve cover faces one end of the first injection fluid inlet, a first sealing ring is installed, and the second valve cover faces one end of the second injection fluid inlet, a second sealing ring is installed.

6. The ejector with a check valve function according to claim 1, wherein:

the first elastic component is a spring, one end of the first elastic component is fixed on the first injection fluid inlet, the other end of the first elastic component is fixed on the first valve cover,

the second elastic member is a spring, one end of the second elastic member is fixed to the second injection fluid inlet, and the other end of the second elastic member is fixed to the second valve cover.

Technical Field

The invention belongs to the technical field of ejectors, and particularly relates to an ejector with a one-way valve function.

Background

In the field of fuel cell ejectors, if the ejector works at a very low flow rate, or the ejector designed for a large flow rate works at a small flow rate, a gas backflow phenomenon can occur. Or when the circulating pump works in parallel, gas backflow can occur. The current product design is to design a check valve alone, but such design results in the structure bulky, and the leakage point is many, thus the reliability is very poor.

Disclosure of Invention

The present invention is made to solve the above problems, and an object of the present invention is to provide an ejector having a check valve function, which is small in size, low in cost, reliable in quality, and convenient to install.

The invention provides an ejector with a one-way valve function, which comprises a nozzle, an accepting chamber, a mixing chamber and a pressure expansion chamber, and is characterized in that:

the receiving chamber is provided with a first injection fluid inlet, the first injection fluid inlet is provided with a first one-way valve, the first one-way valve only enables fluid to flow into the first injection fluid inlet from the first one-way valve, the pressure expansion chamber is provided with a second injection fluid inlet, the second injection fluid inlet is provided with a second one-way valve, and the second one-way valve only enables fluid to flow into the second injection fluid inlet from the second one-way valve.

Further, the ejector with the one-way valve function provided by the invention can also have the following characteristics: the first check valve includes: the first valve cover is arranged on the first injection fluid inlet and provided with a first channel, the first valve plate is rotatably arranged on the first valve cover, the first elastic component is used for providing restoring force and pretightening force for the first valve plate, the first valve plate is matched with the cross section of the first channel of the first valve cover, and the first channel can be completely blocked when the first valve plate is closed,

the second check valve includes: the second valve cover is installed on the second injection fluid inlet and provided with a second channel, a second valve plate is rotatably installed on the second valve cover, and a second elastic component is used for providing restoring force and pretightening force for the second valve plate, the second valve plate is matched with the cross section of the second channel of the second valve cover, and the second channel can be completely blocked when the second valve plate is closed.

Further, the ejector with the one-way valve function provided by the invention can also have the following characteristics: the first valve plate is positioned at one end of the first valve cover facing the first injection fluid inlet,

the second valve plate is located at one end, facing the second injection fluid inlet, of the second valve cover.

Further, the ejector with the one-way valve function provided by the invention can also have the following characteristics: the first valve plate is provided with a first rotating shaft, the first valve cover is provided with a first mounting hole, the first rotating shaft is rotatably mounted in the first mounting hole,

the second valve plate is provided with a second rotating shaft, the second valve cover is provided with a second mounting hole, and the second rotating shaft is rotatably mounted in the second mounting hole.

Further, the ejector with the one-way valve function provided by the invention can also have the following characteristics: the first valve cover faces one end of the first injection fluid inlet, a first sealing ring is installed, and the second valve cover faces one end of the second injection fluid inlet, a second sealing ring is installed.

Further, the ejector with the one-way valve function provided by the invention can also have the following characteristics: the first elastic component is a spring, one end of the first elastic component is fixed on the first injection fluid inlet, the other end of the first elastic component is fixed on the first valve cover,

the second elastic member is a spring, one end of the second elastic member is fixed to the second injection fluid inlet, and the other end of the second elastic member is fixed to the second valve cover.

The invention has the following advantages:

according to the ejector with the one-way valve function, the one-way valve and the inlet and the outlet of the ejection loop of the ejector are integrally designed, the simple and reliable work of the structure is realized, and meanwhile, the volume, the weight and the cost are greatly improved, so that in the application of practical products, the working mode that a plurality of ejectors or ejectors and a circulating pump are connected in parallel can be realized through simple pipeline connection, the cost is saved, the volume is reduced, more importantly, the reliability of the product is improved, and the possible leakage risk is reduced.

Drawings

FIG. 1 is a cross-sectional view of an eductor having a check valve function in an embodiment of the present invention;

FIG. 2 is an exploded view of an eductor with a check valve function in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of the operation of an eductor with a check valve function at high flow rates in an embodiment of the present invention;

fig. 4 is a schematic diagram of the operation of an eductor with a check valve function at low flow rates in an embodiment of the invention.

In fig. 3 and 4, solid arrows indicate a flow direction of the high-pressure fluid, dashed arrows indicate a flow direction of the injection fluid, and dotted arrows indicate a flow direction of the mixed gas.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments specifically describe the ejector with the one-way valve function in combination with the accompanying drawings.

As shown in fig. 1 and 2, the injector 100 having a check valve function includes: nozzle 10, receiving chamber 20, mixing chamber 30, diffusion chamber 40.

The receiving chamber 40 is provided with a first motive fluid inlet 50, the first motive fluid inlet 50 is provided with a first one-way valve 60, and the first one-way valve 60 enables fluid to flow into the first motive fluid inlet 50 only from the first one-way valve 60. The pressure expansion chamber 40 is provided with a second pilot fluid inlet 70, the second pilot fluid inlet 70 is provided with a second one-way valve 80, and the second one-way valve 80 only enables fluid to flow into the second pilot fluid inlet 70 from the second one-way valve 80.

In the present embodiment, the first check valve 60 includes a first valve cover 61, a first valve plate 62, and a first elastic member 63. The first valve cover 61 is provided with a first passage 611, and the first valve cover 61 is mounted on the first injection fluid inlet 50. The first valve plate 62 is rotatably mounted on the first valve cover 61, the cross section of the first channel 611 of the first valve plate 62 and the first valve cover 61 is matched, and the first channel 611 can be completely blocked when the first valve plate 62 is closed. Specifically, the first valve plate 62 is located at one end, facing the first injection fluid inlet 50, of the first valve cover 61, the first rotating shaft 621 is arranged on the first valve plate 62, the first mounting hole 65 is arranged on the first valve cover 61, and the first rotating shaft 621 is rotatably mounted in the first mounting hole 65. The first elastic member 63 provides restoring force and pretightening force for the first valve plate 62, and when the ejector does not work, the first elastic member 63 provides pretightening force for the first valve plate 62, and the first valve plate 62 is closed. When the ejector stops operating by injecting fluid from the first check valve 60 into the receiving chamber 20, the first elastic member 63 provides a restoring force to the first valve plate 62, so that the first valve plate 62 is closed. Specifically, a first sealing ring 64 is installed at one end of the first valve cover 61 facing the first pilot fluid inlet 50, and when the first valve plate 62 is closed, the sealing performance between the first valve plate 62 and the first valve cover 61 is improved.

The structure of the second check valve 80 is the same as that of the first check valve 60. The second check valve 80 includes: a second valve cover 81, a second valve plate 82, and a second elastic member 83. The second valve cover 81 is provided with a second passage 811, and the second valve cover 81 is mounted on the second pilot fluid inlet 70. The second valve plate 82 is rotatably mounted on the second valve cover 81. The second valve plate 82 matches the cross section of the second channel 811 of the second valve cover 81, and the second channel 811 can be completely blocked when the second valve plate 82 is closed. Specifically, the second valve plate 82 is located at one end, facing the second injection fluid inlet 70, of the second valve cover 81, a second rotating shaft 821 is arranged on the second valve plate 82, a second mounting hole is arranged on the second valve cover 81, and the second rotating shaft 821 is rotatably mounted in the second mounting hole. The second elastic component 83 provides restoring force and pretightening force for the second valve plate 82, and when the ejector does not work, the second elastic component 83 provides pretightening force for the second valve plate 82, and the second valve plate 82 is closed. When the ejector stops operating when the ejector enters the pressure expansion chamber 40 from the second check valve 80, the second elastic member 83 provides a restoring force to the second valve piece 82, so that the second valve piece 82 is closed. Specifically, a second sealing ring 84 is installed at one end of the second valve cover 81 facing the second pilot fluid inlet 70, and when the second valve sheet 82 is closed, the sealing performance between the second valve sheet 82 and the second valve cover 81 is increased.

Specifically, the first elastic member 63 is a spring, one end of which is fixed to the first injection fluid inlet 50 and the other end of which is fixed to the first valve cover 61. The second elastic member 83 is a spring, one end of which is fixed to the second injection fluid inlet 70 and the other end of which is fixed to the second valve cover 81. More specifically, the first elastic member 63 includes two springs, and the second elastic member 83 includes two springs.

The first check valve 60 and the second check valve 80 may also be selected from plunger type check valves (check valves in the prior art) or other structures, and the first check valve 60 and the second check valve 80 may be selected from the same structures, for example, the first check valve 60 and the second check valve 80 are both selected from the check valves described in the present embodiment; it is also possible to select a different configuration of the check valve, for example, the first check valve 60 is a check valve as described in the present embodiment, and the second check valve 80 is a plunger type check valve.

The working process is as follows:

when the flow rate of the high-pressure hydrogen is large, the high-pressure hydrogen enters the receiving chamber 20 through the nozzle 10 at a high speed to form jet flow, entrainment flow is generated, a negative pressure area appears due to the high speed of the compressed hydrogen, the pressure is P, the pressure in the first check valve 60 is P1 (when the pressure on the lower side of the first valve plate 62 is seen in the direction of fig. 1), P is less than P1, when the pressure difference between P and P1 is greater than the opening pressure of the first valve plate 62 (namely, when P1-P is greater than the pre-tightening force of the first elastic member 63 on the first valve plate 62), the first valve plate 62 is opened, gas enters the receiving chamber 20 from the first check valve 60 through the first injection fluid inlet 50, is mixed with the high-pressure hydrogen in the mixing chamber 30 for momentum exchange, the velocity field is distributed uniformly in the flowing process, then the mixed fluid enters the diffusion chamber 40, the pressure is increased due to the reduction of the flow rate, the pressure of the mixed gas in the diffusion chamber 40 is greater than the pressure P2 in the second check valve 80, the pressure in the space above the second valve plate 82 at which no additional pressure is applied to the space above the second valve plate 82), so that the second valve plate 82 is closed. Thereby effecting opening of the first valve plate 62 and closing of the second valve plate 82 and injection of gas from the first check valve 60 into the injector.

When the flow rate of the high-pressure hydrogen is small, after the high-pressure hydrogen enters the receiving chamber 20 through the nozzle 10, the pressure P in the receiving chamber 20 is greater than the pressure P1 in the first check valve 60 (when the pressure on the lower side of the first valve plate 62 is seen in the direction of fig. 1), or the pressure P in the receiving chamber 20 is smaller than the pressure P1 in the first check valve 60, but the pressure difference between the two (P1-P is not enough to overcome the pre-tightening force of the first elastic member 63 on the first valve plate 62), the first valve plate 62 is in the closed state, and the gas in the mixing chamber 30 cannot flow out of the first check valve 60, so that the gas backflow is avoided. And extra pressure is applied to the second check valve 80 (when viewed in the direction of fig. 1, extra pressure acts on the upper space of the second valve plate 82), so that the pressure P2 in the upper space of the second valve plate 82 is greater than the pressure in the pressure expansion chamber 40, when the pressure difference is greater than the opening pressure of the second check valve 80 (i.e., P2-P is greater than the pre-tightening force of the second elastic member 83 on the second valve plate 82), the second check valve 80 opens, and gas enters the pressure expansion chamber 40 from the second check valve 80 through the second injection fluid inlet 70, and flows out after being mixed with hydrogen.

When the ejector stops working, the pressure in the ejector, the pressure in the first check valve 60 and the pressure in the second check valve 80 are almost the same, and the first valve plate 62 and the second valve plate 82 are closed under the acting forces of the first elastic member 63 and the second elastic member 83 respectively.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.