CN212643691U - Electromagnetic valve - Google Patents

Abstract

The utility model discloses a solenoid valve, which comprises a valve seat provided with an inlet end and an outlet end, wherein a main valve port is arranged between the inlet end and the outlet end, a piston for opening or closing the main valve port is arranged in a valve cavity of the valve seat, a piston cavity is arranged on one side of the piston away from the main valve port, the piston cavity is communicated with the inlet end through a one-way valve channel, and a valve core is arranged in the one-way valve channel; the piston is provided with a transverse hole which penetrates through and is perpendicular to the one-way valve channel, a limiting pin is arranged in the transverse hole, and the limiting pin is used for limiting the maximum displacement of the valve core moving downwards. The utility model discloses effectively avoided droing of spacer pin, improved the reliability of product to processing is simple, low to the machining precision requirement, can improve machining efficiency, practices thrift the processing cost.

Description

Electromagnetic valve

Technical Field

The utility model relates to a refrigeration plant technical field, concretely relates to solenoid valve.

Background

In the technical field of refrigeration, an electromagnetic valve is a refrigerant flow control component of refrigeration equipment, and the working process generally comprises the following steps: with the energization or the de-energization of the coil, the electromagnetic valve is opened or closed in a refrigeration equipment system such as an air conditioner, so that the circulation and the interruption of a refrigerant are controlled. In some central air conditioning systems, because the pipelines are relatively complex, the refrigerant flow directions of some pipelines are not always in the same direction, and therefore, in the operation or on-off process of the air conditioning system, the solenoid valve is expected to have a bidirectional flow function.

In order to solve the problem of bidirectional flow of the electromagnetic valve, the invention of Chinese patent is as follows: a solenoid valve and a heat exchange device (CN 101994860A) comprising the same disclose a solenoid valve with reversible function, as shown in figures 1 and 2, comprising a valve seat provided with a main valve port, wherein the valve seat is connected with an inlet pipe and an outlet pipe; a piston is arranged in a valve cavity of the valve seat, and moves in the valve cavity so as to open or close the main valve port; a piston cavity is arranged on one side of the piston, which is far away from the main valve port, and the piston cavity is selectively communicated with the main valve port through a pilot valve passage; the piston is further provided with a one-way valve so that the refrigerant can flow into the inlet pipe from the piston cavity. The check valve comprises a valve core 71 and a limiting part 73, wherein the limiting part 73 is used for limiting the maximum displacement of downward movement of the valve core 71. The electromagnetic valve can avoid the piston from vibrating when a high-pressure refrigerant reversely flows, so that vibration noise is generated, and the stability of flow is improved.

However, similar to the improved solenoid valve, there still exist some defects, and the limiting part of the solenoid valve preferably adopts a gasket, the gasket and the piston are fixed only by interference fit, when the piston and the valve core move, the valve core can impact the gasket, the gasket is easy to fall off, and the solenoid valve cannot work normally; in addition, the size requirement of the interference fit between the gasket and the piston is high, the requirement on the machining precision is also high, the machining is difficult and the efficiency is low, and the machining cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a solenoid valve aims at solving the problem among the prior art that above-mentioned background art provided.

The above technical problem of the present invention can be solved by the following technical solutions: a kind of electromagnetic valve, including the valve base with entrance point and exit end, there are main valves between said entrance point and exit end, the valve cavity of the said valve base is equipped with the piston used for opening or closing the main valve port, one side of the said piston far away from the said main valve port has piston chambers, the said piston chamber is communicated with the said exit end selectively through the pilot valve channel; the piston cavity is also communicated with the inlet end through a one-way valve channel, a valve core is arranged in the one-way valve channel, and the valve core moves in the one-way valve channel so as to block or open the one-way valve channel; the piston is provided with a transverse hole which penetrates through and is perpendicular to the one-way valve channel, a limiting pin is arranged in the transverse hole, and the limiting pin is used for limiting the maximum displacement of the valve core moving downwards.

Preferably, an annular groove is formed in the end face, close to the main valve port, of the piston, an annular sealing block is arranged in the annular groove, and the annular sealing block is matched with the main valve port and used for plugging the main valve port.

Preferably, one end of the transverse hole is communicated with the annular groove, and the limiting pin is installed into the transverse hole from the annular groove.

Preferably, an extrusion type horn opening is formed in the middle of the end face, close to the main valve opening, of the piston, a gasket is concentrically arranged on the sealing face of the annular sealing block, and the gasket fixes the annular sealing block through the extrusion type horn opening.

Preferably, the check valve passage comprises a first hole communicated with the piston cavity, a second hole vertically communicated with the first hole, and a valve core accommodating hole coaxially communicated with the second hole in sequence, and the valve core accommodating hole is communicated with the inlet end; the valve core is arranged in the valve core accommodating hole, and the transverse hole penetrates through and is perpendicular to the valve core accommodating hole.

Preferably, the valve core is provided with a sealing surface for plugging the second hole.

Preferably, the opposite lower part of the valve core is provided with an axial through hole, and the opposite upper part of the valve core is provided with a radial hole for communicating the axial through hole with the valve core accommodating cavity.

Preferably, the number of the radial holes is multiple, and the radial holes are uniformly distributed on the circumferential side wall of the upper part of the valve core.

Preferably, the piston is further provided with a balance hole communicating the first hole and the outside of the piston.

Preferably, the pilot valve passage comprises a pilot valve hole, a pilot valve port, a circulation hole and a piston radial hole in sequence, the pilot valve port is communicated with the outlet end, and the piston radial hole is used for communicating the piston cavity with the circulation hole; and a movable core iron is arranged above the pilot valve port and used for closing or opening the pilot valve port.

Compared with the prior art, the utility model, its beneficial effect lies in:

1. the utility model discloses well adoption spacer pin carries on spacingly to the case, and the vertical degree of freedom of spacer pin is restricted by the cross bore, and horizontal degree of freedom is restricted by piston and annular seal piece, can effectively avoid droing of spacer pin, has improved the reliability of product.

2. The utility model discloses a cross bore can directly drill in the bottom surface of annular groove, and processing is simple.

3. The utility model discloses a spacer pin and cross bore can be any one among clearance fit, interference fit, the transition fit, require lowly to the machining precision, can improve machining efficiency, practice thrift the processing cost.

4. The utility model discloses be line contact between well spacer pin and the case, when the refrigerant uniflow-in, increased the lifting surface area of case bottom, reduced the minimum open valve pressure difference of check valve case.

Drawings

Fig. 1 is a schematic structural diagram of a solenoid valve in the prior art.

Fig. 2 is a schematic view of a piston according to the prior art.

Fig. 3 is a schematic view of the overall structure of the present invention.

Fig. 4 is a schematic structural diagram of the piston of the present invention.

Fig. 5 is a schematic structural view of the piston of the present invention without any fittings.

Fig. 6 is a schematic structural diagram of the valve core of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.

Example (b): an electromagnetic valve, as shown in fig. 3-6, comprises a valve seat 1, the valve seat 1 is provided with an inlet end 1a and an outlet end 1b, a main valve port 1c is arranged between the inlet end 1a and the outlet end 1b, and after the main valve port 1c is opened, the inlet end 1a and the outlet end 1b are communicated. An end cover 2 is arranged at one end of the valve seat 1 opposite to the main valve port 1c, a piston 4 is arranged in a valve cavity 1f enclosed by the valve seat 1 and the end cover 2, and the piston 4 moves between the main valve port 1c and the end cover 2 to open or close the main valve port 1 c. A piston cavity 4c is formed in one side, away from the main valve port 1c, of the piston 4, a return spring 3 is arranged in the piston cavity 4c, and two ends of the return spring 3 are respectively abutted against the bottom surface of the piston cavity 4c and the end cover 2; the piston chamber 4c is selectively communicated with the outlet port 1b through a pilot valve passage and with the inlet port 1a through a check valve passage.

In this embodiment, the check valve passage includes, in order, a first bore 4g communicating with the piston chamber 4c, a second bore 4f communicating with the first bore 4g vertically, and a valve element accommodating bore 4d communicating with the second bore 4f coaxially, the valve element accommodating bore 4d communicating with the inlet end 1a, and may be a straight cylinder type or a stepped bore; the valve core accommodating hole 4d is internally provided with a valve core 43, the valve core 43 is provided with a sealing surface for plugging the second hole 4f, the sealing surface can be in a circular arc shape or a conical shape, the opposite lower part of the valve core 43 is provided with an axial through hole 432, the opposite upper part of the valve core 43 is provided with radial holes 431 for communicating the axial through hole 432 with the valve core accommodating cavity 4d, and the number of the radial holes 431 is multiple and is uniformly distributed along the circumferential direction of the valve core 43. In this embodiment, the wall of the first hole 4g is further provided with a balance hole 4h penetrating through the piston wall.

In this embodiment, an annular groove 4a is formed in an end surface of the piston 4 close to the main valve port 1c, an extrusion type bell mouth 4b with an outward opening is formed in the middle of the annular groove 4a, an annular sealing block 41 is assembled in the annular groove 4a, and the annular sealing block 41 is matched with the main valve port 1c and used for plugging the main valve port 1 c; the annular seal block 41 is concentrically provided with an annular gasket 42, the inner ring size of the gasket 42 is between the maximum outer diameter and the minimum outer diameter of the extrusion bell mouth 4b, and the annular seal block 41 can be fixedly mounted in the annular groove 4a by mounting the gasket 42 inside the extrusion bell mouth 4 b. This embodiment still is equipped with circle groove 4i at the outer wall of piston 4, is equipped with piston ring 45 in circle groove 4i, and piston ring 45 matches with the internal diameter size of valve pocket 1f, can provide certain damping effect and noise reduction effect when piston 4 removes.

In this embodiment, in order to limit the maximum displacement of the valve element 43 moving downward and avoid the falling of the limiting element, the valve element is limited by the limiting pin 44. Specifically, a transverse hole 4e is vertically formed at a lower portion of the spool accommodating hole 4d, the transverse hole 4e penetrates through the spool accommodating hole 4d, and the inner diameter of the transverse hole 4e is smaller than that of the spool accommodating cavity 4 d; one end of the transverse hole 4e is communicated with the annular groove 4a, the limiting pin 44 is inserted into the transverse hole 4e from the annular groove 4a, the length of the limiting pin 44 is equivalent to that of the transverse hole 4e, and the limiting pin 44 can limit the valve core 43; then, the annular sealing block 41 is mounted in the annular groove 4a, so that the freedom degree of the limiting pin 44 in any direction can be limited, and the possibility that the limiting pin 44 falls off is eliminated.

When the transverse hole 4e is processed, only the hole needs to be drilled inwards at the bottom surface of the annular groove 4a, and the processing mode is simple; the limit pin 44 and the cross hole 4e can be any one of clearance fit, interference fit and transition fit, and the requirement on the machining precision is low; in addition, the limiting pin 44 is in line contact with the valve core 43, so that when the refrigerant flows in one direction, the force bearing area of the bottom of the valve core 43 is increased, and the minimum valve opening pressure difference of the one-way valve core 43 is reduced.

In the embodiment, the pilot valve passage comprises a pilot valve hole 1d, a pilot valve port 1e, a circulation hole 1g and a piston radial hole 4j which are communicated with each other in sequence, wherein the pilot valve hole 1d is communicated with the outlet end 1b, and the piston radial hole 4j is arranged on the piston 4 and is used for communicating the piston cavity 4c with the circulation hole 1 g; a movable core iron 5 is arranged above the valve guide port 1e and used for closing or opening the valve guide port 1 e. Specifically, when a high-pressure refrigerant enters the valve body from the outlet end 1b, the refrigerant pushes the piston 4 to move towards one side of the end cover 2, meanwhile, a part of the refrigerant enters the guide valve hole 1d, the unit is in a working state at the moment, the coil is electrified, the core iron 5 and the end enclosure 6 are in a suction state, the guide valve hole 1e is in an open state, the high-pressure refrigerant sequentially enters the piston cavity 4c through the guide valve hole 1d, the guide valve hole 1e, the circulation hole 1g and the piston radial hole 4j, and the high-pressure refrigerant entering the piston cavity 4c pushes the valve core 43 to open a one-way valve channel so as to flow into the inlet end 1 a.

When high-pressure refrigerant enters the valve body from the inlet end 1a, the valve core 43 moves upwards under the pushing of the high-pressure refrigerant, so that the sealing surface of the valve core 43 blocks the first hole 4g, the passage of the check valve is cut off, and the high-pressure refrigerant cannot flow into the piston cavity 4 c.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. All changes and modifications that may be made by the technical spirit of the present invention to the above embodiments by simple modification are considered to fall within the scope of the present invention.

Claims (10)

1. A kind of electromagnetic valve, including the valve base with entrance point and exit end, there are main valves between said entrance point and exit end, the valve cavity of the said valve base is equipped with the piston used for opening or closing the main valve port, one side of the said piston far away from the said main valve port has piston chambers, the said piston chamber is communicated with the said exit end selectively through the pilot valve channel; the piston cavity is also communicated with the inlet end through a one-way valve channel, a valve core is arranged in the one-way valve channel, and the valve core moves in the one-way valve channel so as to block or open the one-way valve channel; the piston is provided with a transverse hole which penetrates through and is perpendicular to the one-way valve channel, a limiting pin is arranged in the transverse hole, and the limiting pin is used for limiting the maximum displacement of the valve core moving downwards.

2. A solenoid valve according to claim 1 wherein the end of the piston adjacent to the main valve port defines an annular groove, and an annular sealing block is disposed in the annular groove and mates with the main valve port for sealing off the main valve port.

3. The electromagnetic valve according to claim 2, wherein one end of the cross hole communicates with the annular groove, and the stopper pin is fitted into the cross hole from the annular groove.

4. A solenoid valve according to claim 2 or 3, wherein a squeeze flare is provided in the middle of the end surface of the piston near the main valve port, and a gasket is concentrically provided on the sealing surface of the annular sealing block, and the gasket fixes the annular sealing block through the squeeze flare.

5. The solenoid valve of claim 1 wherein said check valve passage includes, in order, a first bore communicating with said piston chamber, a second bore communicating perpendicularly with said first bore, a spool receiving bore communicating coaxially with said second bore, said spool receiving bore communicating with said inlet port; the valve core is arranged in the valve core accommodating hole, and the transverse hole penetrates through and is perpendicular to the valve core accommodating hole.

6. A solenoid valve according to claim 5 wherein said spool is provided with a sealing surface for sealing off said second bore.

7. The electromagnetic valve according to claim 5 or 6, wherein the valve core has an axial through hole at its opposite lower portion, and a radial hole communicating the axial through hole with the valve core accommodating chamber at its opposite upper portion.

8. The electromagnetic valve according to claim 7, wherein the number of the radial holes is a plurality of radial holes, and the radial holes are uniformly distributed on the circumferential side wall of the valve core at the upper part.

9. A solenoid valve according to claim 5 wherein the piston is further provided with a balance bore communicating the first bore with the exterior of the piston.

10. The solenoid valve according to claim 1, wherein said pilot valve passage comprises, in order, a pilot valve hole, a pilot valve port, a communication hole, and a piston radial hole, said pilot valve port communicating with said outlet port, said piston radial hole communicating with a piston chamber and said communication hole; and a movable core iron is arranged above the pilot valve port and used for closing or opening the pilot valve port.

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